1. The utility model provides a prefabricated component interface staight scissors strenghthened type erects hole, sets up in the perpendicular hole (2) of prefabricated hollow component (1) for lining up, its characterized in that, perpendicular hole (2) are different along direction of height cross-sectional dimension corresponding to the part in vertical reinforcing bar overlap joint section (5) lower part scope to form frustum (7) or boss (8) or the integrated configuration of frustum (7) and boss (8) in this part, the cross-section of perpendicular hole (2) in frustum (7) top surface department is the same with the top surface of frustum (7), the cross-section of perpendicular hole (2) in boss (8) top surface department is greater than the top surface of boss (8).

2. The prefabricated part interface direct shear reinforced type vertical hole as claimed in claim 1, wherein the range of the lower part of the vertical steel bar overlapping section (5) refers to the range of 30% -80% of the height of the vertical steel bar overlapping section (5) from the bottom of the prefabricated hollow part (1).

3. The prefabricated part interface direct shear reinforced vertical hole as claimed in claim 1, wherein when the diameter of the vertical steel bar (3) in the prefabricated part and the diameter of the connecting steel bar (4) in the vertical hole are 8-10 mm, only a frustum (7) or a boss (8) is formed at the part; when the diameter of the vertical steel bar (3) and the diameter of the connecting steel bar (4) in the vertical hole in the prefabricated part are not less than 12mm, a combined structure of a frustum (7) and a boss (8) is formed at the part, wherein the boss (8) is arranged at the lower part of the frustum (7), or only the frustum (7) or the boss (8) is formed separately.

4. The prefabricated part interface direct shear reinforced vertical hole as claimed in claim 1 or 3, wherein the size of the frustum (7) along the height direction is 150-500 mm, the size of the cross section along the height direction is larger at the upper part and smaller at the lower part, and the size of the bottom surface of the frustum (7) along the thickness and length direction of the prefabricated part (1) is 5-30 mm smaller than that of the top surface of the frustum (7).

5. The prefabricated part interface direct shear reinforced vertical hole as claimed in claim 1 or 3, wherein the size of the boss (8) along the height direction is 100-300 mm, the size of the cross section along the height direction is consistent, or the size of the cross section along the height direction is larger at the upper part and smaller at the lower part.

6. The prefabricated part interface direct shear reinforced vertical hole as claimed in claim 5, wherein the size of the top surface of the boss (8) along the thickness and length direction of the prefabricated part (1) is reduced by 5-30 mm compared with the section of the vertical hole (2) at the top surface of the boss (8) as a whole, and new and old concrete forms a meshing effect at the top of the boss (8).

7. The prefabricated part interface direct shear reinforced type vertical hole as claimed in claim 1 or 3, wherein the vertical hole (2) only changes the size of the cross section along a single direction of the thickness or the length of the prefabricated part (1) or simultaneously changes the sizes of the cross section along two directions of the thickness and the length of the prefabricated part (1) to form a frustum (7) or a boss (8) or a combination structure of the frustum (7) and the boss (8).

8. The prefabricated member interface direct shear reinforced type vertical hole according to claim 1, wherein the cross-sectional shape of the vertical hole (2) is rectangular, circular, oval, rounded rectangular or chamfered rectangular.

9. A prefabricated component having the prefabricated component interface shear-strengthened vertical bore of claim 1.

10. The method for preparing the prefabricated member according to claim 9, wherein a vertical hole core mold corresponding to the frustum (7) and the boss (8) is adopted for integrally pulling the core from the top of the prefabricated hollow member (1) at one time, or pipeline occupying space with the shape consistent with the frustum (7) and the boss (8) is adopted for forming, and the pipeline is reserved in the prefabricated hollow member (1) after the processing is completed.

Background

The laminated concrete structure system is a newly-developed assembled integral concrete structure system in China at present, and has obtained many project application achievements nationwide, the prefabricated vertical component in the laminated concrete structure is a prefabricated hollow component with a continuous cavity or a vertical hole in the middle, and the representative technical system comprises a double-sided laminated shear wall, an EVE prefabricated hollow wallboard, an SPCS steel bar welding net laminated shear wall, a longitudinal rib laminated shear wall and the like.

At present, a prefabricated hollow component with vertical holes mostly adopts core dies to loose cores to form the vertical holes, the inner walls of the vertical holes are close to the natural molding surface of a steel die after the core pulling is finished, and the surface is smooth and has no obvious rough surface. After the concrete is poured in the vertical hole in situ, the bonding strength of the new and old concrete bonding surfaces on the inner wall of the vertical hole is low, the shearing force transfer capability is poor, the lap joint force transfer effect of the vertical steel bars in the prefabricated hollow component and the connecting steel bars in the vertical hole is directly influenced, and the structure safety is influenced. Especially, the precast concrete and the post-cast concrete in the vertical hole are not poured simultaneously, the post-cast concrete in the vertical hole is easy to shrink, the bonding strength of the joint surfaces of the new concrete and the old concrete is further weakened, the quality hidden trouble is caused, and the wide industry attention is attracted. In order to improve the bonding performance of new and old concrete joint surfaces on the inner wall of a vertical hole, a water-washed rough surface or a key groove is usually arranged in the vertical hole of the prefabricated hollow component at present. The preparation washing mat surface often need set up special washing station, arranges production and produces the influence to prefabricated component, and waste water causes environmental pollution, processing difficulty easily, and the hole-by-hole washes inefficiency, and washing mat surface shear resistance receives new and old concrete faying face shrink fracture influence great. Set up the keyway and need add keyway shaping frock on the mandrel in erecting the downthehole, the mandrel often the cross-section is less, and keyway shaping frock installation is inconvenient, and keyway shaping frock manual demoulding difficulty, mechanical structure is complicated when adopting hydraulic demoulding, with high costs, the fault rate is high, sets up keyway shaping frock one-step increase mould cost by one hole, and clearance difficulty, artifical quantity are big after the keyway shaping frock drawing of patterns.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a prefabricated part interface direct shear reinforced vertical hole, a prefabricated part with the vertical hole and preparation thereof, wherein the section size of the vertical hole is changed at the lower part of a vertical hole steel bar overlapping section of a prefabricated hollow part, and a frustum or a boss is formed on the inner wall of the vertical hole. The frustum can increase the normal stress of the new and old concrete interfaces when the vertical steel bars are pulled, and further improve the shear transfer capacity of the new and old concrete interfaces of the vertical hole through the friction effect; the boss position can improve the shear force transfer capacity of the new and old concrete interface of the vertical hole through the occlusion effect of the new and old concrete. The invention can avoid arranging water-washing rough surfaces or key grooves in the vertical holes of the prefabricated hollow components to improve the interface shear force transfer capability, and simultaneously, the frustum or the boss can be formed by one-time integral core pulling of a matched vertical hole core mould or pipeline occupation without adopting complex mechanical equipment, thereby reducing the fault rate of production equipment and ensuring the production efficiency of the prefabricated hollow components.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a prefabricated component interface staight scissors strenghthened type erects hole, sets up in the perpendicular hole 2 of prefabricated hollow component 1 for link up, perpendicular hole 2 is different along direction of height cross-sectional dimension corresponding to the part in 5 lower part ranges of vertical reinforcement overlap joint section to form frustum 7 or boss 8 or the integrated configuration of frustum 7 and boss 8 in this part, the cross-section of perpendicular hole 2 in frustum 7 top surface department is the same with the top surface of frustum 7, and the cross-section of perpendicular hole 2 in boss 8 top surface department is greater than the top surface of boss 8. The frustum 7 can increase the normal stress of the inner wall of the vertical hole 2 when the connecting steel bar 4 in the vertical hole is pulled, and improve the shear transfer capacity of a new and old concrete interface 9 of the inner wall of the vertical hole 2 through friction; the 8 positions of the bosses can directly improve the shear force transfer capacity of the new and old concrete interface 9 on the inner wall of the vertical hole 2 through the occlusion effect of the new and old concrete, and the lap joint force transfer effect of the vertical steel bars 3 in the prefabricated part and the connecting steel bars 4 in the vertical hole is ensured.

The lower range of the vertical steel bar overlapping section 5 refers to the range which is from the bottom of the prefabricated hollow component 1 and accounts for 30% -80% of the height of the vertical steel bar overlapping section 5.

When the diameters of the vertical steel bars 3 in the prefabricated part and the connecting steel bars 4 in the vertical holes are 8-10 mm, only a frustum 7 or a boss 8 is formed at the part; when the diameter of the vertical steel bar 3 in the prefabricated part and the diameter of the connecting steel bar 4 in the vertical hole are not less than 12mm, a combined structure of the frustum 7 and the boss 8 is formed at the part, wherein the boss 8 is arranged at the lower part of the frustum 7, and the frustum 7 or the boss 8 can be independently arranged at the moment.

The size of the frustum 7 in the height direction is 150-500 mm, the size of the cross section in the height direction is large at the upper part and small at the lower part, and the size of the bottom surface of the frustum 7 in the thickness direction and the length direction of the prefabricated part 1 is 5-30 mm smaller than that of the top surface of the frustum 7.

The size of the boss 8 in the height direction is 100-300 mm, the size of the cross section in the height direction is consistent, or the upper part of the cross section in the height direction is large and the lower part of the cross section is small.

The size of the top surface of the boss 8 along the thickness and length direction of the prefabricated part 1 is reduced by 5-30 mm compared with the section of the vertical hole 2 at the top surface of the boss 8, and new and old concrete forms a meshing effect at the top of the boss 8.

The vertical hole 2 only changes the dimension of the cross section along a single direction of the thickness or the length of the prefabricated part 1, or simultaneously changes the dimensions of the cross section along two directions of the thickness and the length of the prefabricated part 1, so that a frustum 7 or a boss 8 or a combination structure of the frustum 7 and the boss 8 is formed.

The cross section of the vertical hole 2 is rectangular, circular, oval, round-angle rectangular or corner-cut rectangular.

The invention also claims a prefabricated part with the interface direct shear reinforced vertical hole of the prefabricated part.

The preparation method of the prefabricated part comprises the following steps: the method is characterized in that a vertical hole core mold corresponding to the frustum 7 and the boss 8 is adopted to be integrally formed by pulling cores from the top of the prefabricated hollow component 1 at one time, or pipeline occupying with the same shape as the frustum 7 and the boss 8 is adopted to be formed, and the pipeline is reserved in the prefabricated hollow component 1 after the prefabricated hollow component is processed.

Compared with the prior art, the invention has the beneficial effects that:

(1) in the invention, the frustum or the boss is formed at the lower part of the steel bar overlapping section, the shear transfer capacity of the new and old concrete interface of the vertical hole can be improved through the friction action in the frustum range or the engagement action of the boss, the interface shear transfer capacity is not influenced by the post-cast concrete shrinkage in the vertical hole, and the overlapping force transfer effect of the vertical steel bar in the prefabricated hollow component and the connecting steel bar in the vertical hole can be ensured.

(2) The frustum or the boss at the lower part of the vertical hole can be formed by integrally pulling the core from the top of the prefabricated hollow component by adopting a vertical hole core mould at one time or formed by occupying the space of a pipeline, the processing technology is simple, the extra manual requirement is not generated, the production and processing efficiency is high, and the cost is low.

(3) The invention can avoid the arrangement of water washing rough surfaces in the vertical holes of the prefabricated hollow components, does not need to arrange special water washing stations during production, and has no corresponding problems of waste water pollution and waste water treatment.

(4) The invention can avoid setting key slots in the vertical holes of the prefabricated hollow components, does not need to introduce complex key slot forming tools on the vertical hole core mould, only needs to change the appearance of the core mould, has no mechanical fault risk, can ensure the production beat, and has low core mould cost and easy cleaning.

Drawings

FIG. 1 is a three-dimensional schematic view of the vertical steel bar lap joint of the vertical hole of the reinforced interface direct shear type of the prefabricated part of the invention, wherein the vertical hole has a rectangular section and is provided with a frustum and a boss at the lower part.

Fig. 2 is a schematic view of the vertical hole of the prefabricated hollow member in fig. 1.

Fig. 3 is a schematic view of an a-a section of the steel bar overlapping structure in fig. 1.

Fig. 4 is a schematic view of a steel bar overlapping structure in which only a frustum is provided at the lower portion of a vertical hole.

Fig. 5 is a schematic view of a steel bar overlapping structure in which a boss is only provided at the lower portion of a vertical hole.

Fig. 6 is a comparative example of the steel bar overlapping structure shown in fig. 3, 4 and 5, that is, a vertical hole structure of a conventional prefabricated hollow member.

Fig. 7 is a modification of the prefabricated part interface direct shear reinforced vertical hole shown in fig. 2, wherein only a frustum is arranged at the lower part of the vertical hole.

Fig. 8 is a second modification of the prefabricated unit interface direct shear reinforced vertical hole shown in fig. 2, wherein only a boss is provided at the lower part of the vertical hole.

Fig. 9 is a schematic view of the prefabricated part interface direct shear reinforced vertical hole of the present invention applied to a circular vertical hole, wherein only a frustum is disposed at the lower part of the vertical hole.

Fig. 10 is a modification of the prefabricated unit interface shear-enhanced vertical hole of fig. 9, in which only a boss is provided at a lower portion of the vertical hole.

Fig. 11 is a modified form of the prefabricated unit interface straight shear-enhanced vertical hole shown in fig. 10, in which a boss is large at the upper portion and small at the lower portion in the cross-sectional dimension in the height direction.

Fig. 12 is a schematic view of the prefabricated part interface direct shear reinforced vertical hole of the present invention applied to an oval vertical hole, wherein only a frustum is disposed at the lower part of the vertical hole.

Fig. 13 is a modified version of the prefabricated unit interface shear-enhanced vertical bore of fig. 12, wherein only a boss is provided at the lower portion of the vertical bore.

Fig. 14 is a modification of the prefabricated unit interface straight shear-enhanced vertical hole of fig. 13, in which the upper portion of the cross-sectional dimension of the boss in the height direction is large and the lower portion is small.

FIG. 15 is a schematic view of the reinforced vertical hole of the prefabricated member interface direct shear of the present invention applied to a rectangular vertical hole with rounded corners, wherein the lower portion of the vertical hole is provided with a frustum and a boss.

Fig. 16 is a modification of the prefabricated unit interface straight shear enhanced vertical hole shown in fig. 15, wherein only a frustum is provided at the lower part of the vertical hole.

FIG. 17 is a conduit for forming the vertical bore shown in FIG. 16.

Fig. 18 is a second modification of the prefabricated unit interface shear-enhanced vertical hole shown in fig. 16, wherein only a boss is provided at the lower portion of the vertical hole.

Fig. 19 is a schematic view of the prefabricated part interface direct shear reinforced vertical hole of the present invention applied to a corner cut rectangular vertical hole, wherein a frustum and a boss are simultaneously disposed at the lower part of the vertical hole.

Fig. 20 is a modification of the prefabricated unit interface straight shear reinforced vertical hole shown in fig. 19, wherein only a boss is provided at the lower part of the vertical hole, and the cross-sectional dimension of the boss in the height direction is kept constant.

Fig. 21 is a modified form of the prefabricated unit interface straight shear enhanced vertical hole of fig. 20, in which the upper portion of the cross-sectional dimension of the boss in the height direction is large and the lower portion is small.

FIG. 22 is a schematic view of the vertical hole with a reinforced type of direct shear at the interface of the prefabricated member of the present invention applied to a vertical hole with a special-shaped cross section, wherein a frustum and a boss are simultaneously arranged at the lower part of the vertical hole, and four vertical steel bars are arranged at four corners of the vertical hole of the prefabricated hollow member.

Fig. 23 is a modified version of the prefabricated interface shear-enhanced vertical bore of fig. 22, wherein only a frustum is provided below the vertical bore.

FIG. 24 is a schematic view of the vertical hole with a reinforced interface of prefabricated parts applied to a vertical hole with a special-shaped cross section, wherein a frustum and a boss are simultaneously arranged at the lower part of the vertical hole, and six vertical steel bars are arranged at the periphery of the vertical hole of the prefabricated hollow part.

Fig. 25 is a modified version of the prefabricated interface shear enhanced vertical bore of fig. 24, wherein only a frustum is provided below the vertical bore.

In the figure: 1-prefabricating a hollow member; 2-vertical hole; 3-vertical steel bars in the prefabricated part; 4-connecting reinforcing steel bars in the vertical holes; 5-vertical steel bar lap joint section; 6-vertical steel bar non-lap joint section; 7-frustum of a cone; 8-boss; 9-new and old concrete interface.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the drawings and examples.

As shown in fig. 1 to 3, the vertical hole of the prefabricated member interface direct shear reinforced type of the present invention is a vertical hole 2 penetrating through a prefabricated hollow member 1, the prefabricated hollow member 1 is divided into a vertical steel bar non-overlapping section 6 and a vertical steel bar overlapping section 5, the vertical steel bar overlapping section 5 is located at a lower portion, and the vertical steel bar non-overlapping section 6 is located at an upper portion. The cross section of the vertical hole 2 is rectangular, and the shape of the cross section is unchanged up and down within the range of the vertical steel bar non-lap joint section 6. In the lower range of the vertical steel bar overlapping section 5, the section size of the vertical hole 2 is changed along the height direction of the vertical hole 2, and a combined structure of a frustum 7 and a boss 8 is formed on the inner wall of the vertical hole 2, wherein the boss 8 is arranged below the frustum 7. The top surface of the frustum 7 is the same as the section of the vertical hole 2 at the top surface of the frustum 7, and the top surface of the boss 8 is smaller than the section of the vertical hole 2 at the top surface of the boss 8.

When the connecting steel bars 4 in the vertical holes are pulled, larger normal stress can be generated on the inner wall of the vertical hole 2 within the range of the frustum 7, and the shearing force transfer capability of a new and old concrete interface 9 on the inner wall of the vertical hole 2 is improved through the friction action; the 8 positions of the bosses can directly improve the shear force transfer capacity of the new and old concrete interface 9 on the inner wall of the vertical hole 2 through the occlusion effect of the new and old concrete, and the lap joint force transfer effect of the vertical steel bars 3 in the prefabricated part and the connecting steel bars 4 in the vertical hole is ensured.

The size of the frustum 7 in the height direction of the vertical hole 2 is 150-500 mm, the specific size can be determined according to the diameter and the lap joint length of the vertical steel bar 3 in the prefabricated part, the upper part of the cross section size in the height direction is large, the lower part of the cross section size in the height direction is small, and the size of the bottom surface of the frustum 7 in the thickness direction and the length direction of the prefabricated hollow part 1 is 5-30 mm smaller than that of the top surface of the frustum 7.

The boss 8 is 100 ~ 300mm along 2 direction of height sizes in vertical hole, and specific size can be confirmed according to 3 diameters of vertical reinforcement and overlap joint length in the prefabricated component, and is unanimous along direction of height cross section size. The size of the top surface of the boss 8 along the thickness and length direction of the prefabricated part 1 is reduced by 5-30 mm compared with the section of the vertical hole 2 at the top surface of the boss 8, and the fact that the prefabricated hollow part 1 and post-cast concrete in the vertical hole 2 form an occlusion effect at the top of the boss 8 is guaranteed.

The new and old concrete interface 9 on the inner wall of the vertical hole 2 shown in fig. 1-3 has stronger shearing force transfer capability, and can be used for the situation that the diameter of the vertical steel bar 3 in the prefabricated part and the diameter of the connecting steel bar 4 in the vertical hole are not less than 12 mm.

The vertical holes 2 shown in fig. 1 to 3 may be formed by integrally pulling cores of vertical holes having shapes corresponding to the frustum 7 and the boss 8 from the top of the prefabricated hollow member 1 at a time, or by occupying the space of the pipeline having the same shape as the frustum 7 and the boss 8, and the pipeline is retained inside the prefabricated hollow member 1 after the prefabricated hollow member 1 is processed.

Fig. 4 provides a schematic diagram of a steel bar lapping structure in which only the frustum 7 is arranged at the lower part of the vertical hole 2, when the connecting steel bar 4 in the vertical hole is pulled, a larger normal stress can be generated on the inner wall of the vertical hole 2 within the range of the frustum 7, and the shearing force transfer capability of a new and old concrete interface 9 on the inner wall of the vertical hole 2 is improved through the friction action.

Fig. 5 provides a schematic diagram of a steel bar overlapping structure in which only a boss 8 is arranged at the lower part of a vertical hole 2, the size of the top surface of the boss 8 along the thickness and length directions of a prefabricated part 1 is reduced by 5-30 mm compared with the whole top surface of the vertical hole 2, and the size of the cross section of the boss 8 along the height direction is large at the upper part and small at the lower part. When the connecting reinforcing steel bars 4 in the vertical holes are pulled, the positions of the bosses 8 can directly improve the shear transfer capacity of new and old concrete interfaces 9 on the inner walls of the vertical holes 2 through the occlusion effect of the new and old concrete, meanwhile, the bosses 8 are large in the upper part and small in the lower part along the cross section dimension in the height direction, large positive stress can be generated on the inner walls of the vertical holes 2 in the range of the bosses 8, and the shear transfer capacity of the new and old concrete interfaces 9 on the inner walls of the vertical holes 2 is further improved through the friction effect.

Fig. 6 is a schematic view showing a steel bar overlapping structure at a vertical hole position of a conventional prefabricated hollow member, which is a comparative example of the present invention. In the range of the vertical steel bar overlapping section 5, the size of the cross section of the vertical hole 2 along the height direction is unchanged, and the interface 9 of new and old concrete on the inner wall of the vertical hole 2 transfers the interface shear force generated by the overlapping connection of the vertical steel bar 3 and the connecting steel bar 4 in the vertical hole in the prefabricated part only by means of the bonding action. Compared with the comparative example, when the connecting steel bars 4 in the vertical hole are pulled, the shearing force transfer capability of the new and old concrete interface 9 on the inner wall of the vertical hole 2 can be improved through the friction effect in the range of the frustum 7 and the new and old concrete meshing effect at the position of the boss 8 in the vertical hole interface direct shear reinforced vertical hole shown in the figures 3, 4 and 5, the interface bonding effect is not required, the shearing force transfer capability of the interface 9 is not influenced by the dry shrinkage of the post-cast concrete in the vertical hole 2, and the lap joint force transfer effect of the vertical steel bars 3 in the prefabricated part and the connecting steel bars 4 in the vertical hole can be ensured.

Fig. 7 shows a first modification of fig. 2, and the specific modification is that the vertical hole 2 is only provided with a frustum 7 in the lower range of the vertical steel bar overlapping section 5, and the vertical hole 2 is simpler to manufacture.

Fig. 8 shows a second modification of fig. 2, which is specifically modified in that only the boss 8 is arranged in the vertical hole 2 in the lower range of the vertical steel bar overlapping section 5, and the cross-sectional dimension of the boss 8 in the height direction is larger at the upper part and smaller at the lower part.

FIG. 9 is a schematic view of the prefabricated member interface direct shear reinforced vertical hole applied to a circular vertical hole, the cross section of the vertical hole 2 is circular, only a frustum 7 is arranged at the lower part, and the diameter of the bottom surface of the frustum 7 is 5-30 mm smaller than that of the top surface of the frustum 7. When the connecting steel bars 4 in the vertical holes are pulled, larger normal stress can be generated on the inner wall of the vertical hole 2 within the range of the frustum 7, and the shearing force transfer capability of a new and old concrete interface 9 on the inner wall of the vertical hole 2 is improved through the friction action.

Fig. 10 shows the improved form of fig. 9, and the specific improvement lies in that the vertical hole 2 is only provided with a boss 8 in the lower range of the vertical steel bar overlapping section 5, the diameter of the top surface of the boss 8 is 5-30 mm smaller than that of the top surface of the vertical hole 2, and new and old concrete at the top of the boss 8 forms a meshing effect.

Fig. 11 shows a modification of fig. 10, which is specifically modified in that the boss 8 has a large upper part and a small lower part along the height direction cross section diameter, so that the interface shear force transfer capability can be further improved by friction in the range of the boss 8, and the vertical holes 2 are easier to loose cores when the vertical holes are formed by integrally pulling cores from the top of the prefabricated hollow component 1 at one time by using vertical hole core molds.

Fig. 12 provides a schematic view of the application of the reinforced vertical hole of the prefabricated member interface direct shear of the present invention to an elliptical vertical hole, wherein the lower portion of the elliptical vertical hole 2 is only provided with a frustum 7, and the size of the bottom surface of the frustum 7 along the thickness and length direction of the prefabricated hollow member 1 is 5-30 mm smaller than that of the top surface of the frustum 7.

Fig. 13 shows the improvement of fig. 12, and the specific improvement lies in that the vertical hole 2 in the lower range of the vertical steel bar overlapping section 5 is only provided with a boss 8, the size of the top surface of the boss 8 along the thickness and length direction of the prefabricated part 1 is integrally reduced by 5-30 mm compared with that of the top surface of the vertical hole 2, and the size of the cross section of the boss 8 along the height direction is consistent.

Fig. 14 shows a modification of fig. 13, in which the boss 8 has a cross-sectional dimension in the height direction that is larger at the upper portion and smaller at the lower portion.

Fig. 12, fig. 13 and fig. 14 can be used in the situation that the diameters of the vertical steel bars 3 and the vertical in-hole connecting steel bars 4 in the prefabricated part are 8-10 mm, and at the moment, the lap joint of the vertical steel bars 3 and the vertical in-hole connecting steel bars 4 in the prefabricated part has lower requirements on the shear transfer capacity of the new and old concrete interface 9 on the inner wall of the vertical hole 2.

Fig. 15 provides a schematic view of the application of the reinforced vertical hole of the prefabricated member interface direct shear of the present invention to a rounded rectangular vertical hole, wherein a frustum 7 and a boss 8 are simultaneously arranged in the lower range of the vertical steel bar overlapping section 5 of the prefabricated hollow member 1, and the boss 8 is arranged below the frustum 7. The size of the bottom surface of the frustum 7 along the thickness and length direction of the prefabricated hollow component 1 is 5-30 mm smaller than that of the top surface of the frustum 7. The size of the top surface of the boss 8 along the thickness and length direction of the prefabricated part 1 is reduced by 5-30 mm compared with the size of the top surface of the vertical hole 2, and the size of the cross section of the boss 8 along the height direction is consistent.

Fig. 16 shows a first modification of fig. 15, which is specifically modified in that only the frustum 7 is arranged in the vertical hole 2 in the lower range of the vertical steel bar overlapping section 5, and the vertical hole 2 is simpler to manufacture. The vertical holes 2 in fig. 16 can be formed by occupying the space of the pipe shown in fig. 17, and the pipe is remained in the prefabricated hollow member 1 after the prefabricated hollow member 1 is processed.

Fig. 18 shows a second modification of fig. 16, which is a specific modification that only the boss 8 is provided in the vertical hole 2 in the lower range of the vertical steel bar overlapping section 5, and the cross-sectional dimension of the boss 8 in the height direction is larger at the upper part and smaller at the lower part.

Fig. 19 provides a schematic view of the application of the reinforced vertical hole of the prefabricated member interface direct shear in the corner cut rectangular vertical hole, the cross section of the vertical hole 2 is in the shape of the corner cut rectangle, a frustum 7 and a boss 8 are simultaneously arranged in the range of the lower part of the vertical steel bar overlapping section 5 of the prefabricated hollow member 1, and the boss 8 is arranged at the lower part of the frustum 7.

Fig. 20 shows a modification of fig. 19, which is specifically modified in that only the boss 8 is provided in the vertical hole 2 in the lower range of the vertical steel bar overlapping section 5, and the size of the cross section of the boss 8 in the height direction is uniform.

Fig. 21 shows a modification of fig. 20, in which the boss 8 has a cross-sectional dimension in the height direction that is larger at the upper portion and smaller at the lower portion.

Fig. 22 is a schematic view showing that the prefabricated part interface direct shear reinforced vertical hole of the present invention is applied to a vertical hole with a special-shaped cross section, the cross section of the vertical hole 2 is in the shape of a special-shaped cross section, four vertical steel bars are arranged at four corners of the vertical hole 2 of the prefabricated hollow part 1, a frustum 7 and a boss 8 are simultaneously arranged in the range of the lower part of the vertical steel bar lap joint section 5 of the prefabricated hollow part 1, and the boss 8 is arranged at the lower part of the frustum 7.

Fig. 23 shows a modification of fig. 22, in which the vertical hole 2 is provided with only the frustum 7 in the lower range of the vertical bar overlapping section 5.

Fig. 24 is a schematic view showing that the prefabricated part interface direct shear reinforced vertical hole of the present invention is applied to a vertical hole with a special-shaped cross section, the cross section of the vertical hole 2 is in the shape of a special-shaped cross section, six vertical steel bars are arranged around the vertical hole 2 of the prefabricated hollow part 1, a frustum 7 and a boss 8 are simultaneously arranged in the range of the lower part of the vertical steel bar lap joint section 5 of the prefabricated hollow part 1, and the boss 8 is arranged at the lower part of the frustum 7.

Fig. 25 shows a modification of fig. 24, in which the vertical hole 2 is provided with only the frustum 7 in the lower range of the vertical bar overlapping section 5.

Force transmission is realized through lap joint between the connecting steel bars in the vertical holes of the prefabricated hollow components and the vertical steel bars in the prefabricated hollow components, shear stress is formed on the interfaces of new and old concrete on the inner walls of the vertical holes when the steel bars are pulled, and the lap joint force transmission effect of the connecting steel bars in the vertical holes and the vertical steel bars in the prefabricated hollow components is directly influenced by the shear force transmission capacity of the interfaces of the new and old concrete on the inner walls of the vertical holes. According to the invention, in the lower range of the vertical steel bar lapping section of the prefabricated hollow component, the section size of the vertical hole is changed along the height direction of the vertical hole, a frustum or a boss is formed on the inner wall of the vertical hole, the shear transfer capacity of a new concrete interface and an old concrete interface on the inner wall of the vertical hole is improved through the friction action in the frustum range and the new concrete and old concrete meshing action at the boss position, and the lapping force transfer performance of the connecting steel bar in the vertical hole and the vertical steel bar in the prefabricated hollow component is ensured. Compare and erect downthehole setting washing mat surface at prefabricated hollow component, need not to set up special washing station during production, do not have corresponding waste water pollution and waste water treatment problem. Compared with the key groove arranged in the vertical hole of the prefabricated hollow component, the frustum or the boss at the lower part of the vertical hole can be formed by integrally pulling the core from the top of the prefabricated hollow component by adopting a vertical hole core mould at one time or by adopting pipeline occupation, the processing technology is simple, a complex key groove forming tool does not need to be introduced into the vertical hole core mould, the appearance of the core mould only needs to be changed, the mechanical fault risk is avoided, the production beat can be ensured, the core mould is low in cost and easy to clean.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes and substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.