1. The utility model provides a non-excavation of underground structure steel sheet fore shaft grout connecting device which characterized in that: the sub-joint is drawn by external force or pushed into the bearing and is inserted in the female joint to realize linkage, forms bottom surface grout bearing area and a plurality of side grout bearing area between the outer wall of sub-joint and the inner wall of female joint, bottom surface grout bearing area and a plurality of side grout bearing area are the shape that the middle is wide two little, injects grout hardening in bottom surface grout bearing area and a plurality of side grout bearing area and realize adjacent connection, and bottom surface grout bearing area bears the pressure along the horizontal direction when the fore shaft is compressed, and a plurality of side grout bearing area bears the pressure along the thickness direction when the fore shaft is pulled.

2. The underground structure trenchless steel plate fore shaft grouting connection device of claim, wherein: the sub-joints are in non-circular shapes, triangular shapes or polygonal shapes.

3. The underground structure trenchless steel plate fore shaft grouting connection device of claim 2, wherein: and joint filling is arranged between the contact surfaces of the sub-joint and the female joint, and the contact surface of the sub-joint is an arc surface.

4. The underground structure trenchless steel plate fore shaft grouting connection device of claim 3, wherein: and the joint filling, bottom surface grouting material bearing area and the side surface grouting material bearing areas are synchronously and uniformly grouted.

5. The underground structure trenchless steel plate fore shaft grouting connection device of claim 1, wherein: the inner wall of the female joint is a triangular column connected by a molded surface, the shape of the inner wall of the female joint is a claw shape for clamping an object, the shape of the inner wall of the female joint is provided with a locking opening, and the male joint enters the inner wall of the female joint through the locking opening.

6. The underground structure trenchless steel plate fore shaft grouting connection device of claim 4, wherein: the bottom surface normal of the female joint is at the center and is superposed with the axis of the steel plate where the female joint is located.

7. The underground structure trenchless steel plate fore shaft grouting connection device of claim 1, wherein: the bottom surface grouting material bearing area and the side surface grouting material bearing areas are reinforced by the hoop, and the grouting material adopts compensation shrinkage grouting material.

Background

A jes (joint Element structure) construction method is a non-excavation construction method for an underground structure, and is a method for constructing a structure having an underground main structure shape by combining prefabricated standard square steel pipes in series. The adjacent square steel pipes are connected by a JES joint, cement slurry is injected into the gap between the joints for further firm connection, and finally concrete is filled into the standard square steel pipes forming the structure, so that the underground permanent main body structure can be formed.

The JES joint gap is S-shaped, the gap filling opening is large, the restriction of a grouting material bearing area is small, the unconfined compressive strength of the grouting material is low, and the grouting material enters a failure state when being transversely expanded and cracked under pressure. The JES joint gap is large, and the assembly size deviation of the plate unit is large. The whole gap is uneven in width, the compressive strength of the grouting material is low when the gap is large, the grouting filling degree of the pore canal is good when the gap is small, and the strength of the grouting material is influenced by the size of the gap.

The rectangular pipe curtain is characterized in that each single pipe is connected with the flange of the steel pipe through a tenon to form a CT-shaped locking opening of the pipe row, the steel pipes of the pipe curtain are connected through the locking openings, and water-stopping agents or mortar are injected into the locking openings to form a sealed water-stopping pipe curtain.

The CT-shaped joint gaps are distributed in a strip shape, the gap filling openings are large, and the constraint of a grouting material bearing area is small; the joint clearance is large, and the assembly size deviation of the plate units is large; the width of the whole gap is not uniform, and the grouting filling degree of the pore channel is not good enough.

The above is where the present application needs to be addressed.

Disclosure of Invention

The invention aims to provide a non-excavation steel plate locking grouting connecting device for an underground structure, which is used for improving the axial compressive strength of grouting material in a bearing area.

In order to solve the technical problems, the invention provides a steel plate locking notch grouting connecting device for non-excavation of an underground structure, a sub-joint is inserted into a female joint to realize linkage by being pulled by external force or pushed into the female joint, a bottom grouting material bearing area and a plurality of side grouting material bearing areas are formed between the outer wall of the sub-joint and the inner wall of the female joint, the bottom grouting material bearing area and the plurality of side grouting material bearing areas are in a shape with a wide middle and two small ends, grouting materials are injected into the bottom grouting material bearing areas and the plurality of side grouting material bearing areas to be hardened to realize adjacent connection, the bottom grouting material bearing areas bear pressure along the horizontal direction when a locking notch is pressed, and the plurality of side grouting material bearing areas bear pressure along the thickness direction when the locking notch is pulled.

The sub-joints are in non-circular shapes, triangular shapes or polygonal shapes. And joint filling is arranged between the contact surfaces of the male joint and the female joint, and the contact surface of the male joint is an arc surface and bears the pressure applied by grouting material on the interface.

The joint filling, bottom surface grouting material bearing area and the side surface grouting material bearing areas are synchronously and evenly grouted, the stress balance of the sub-joints is maintained, the sub-joints are static, and the thickness of the joint filling is kept uniform.

The inner wall of the female joint is a triangular column connected by a molded surface, the shape of the female joint is a claw shape for clamping an object, the shape of the female joint is provided with a locking opening, and the male joint enters the inner wall of the female joint through the locking opening to ensure the transmission of the pulling force of the locking opening. The normal line of the bottom surface of the female joint is in the center and is overlapped with the axis of the steel plate where the female joint is located, and pressure transmission of the locking port is guaranteed.

The bottom surface grouting material bearing area and the side surface grouting material bearing areas are reinforced by the hoop, and the grouting material adopts compensation shrinkage grouting material.

The invention has the following advantages:

1) the problems of small pressure side limit and small grouting gap of a grouting material bearing area in the prior art are solved;

2) the invention concentrates the tension and compression bearing of the grouting material in the bottom grouting material bearing area and the side grouting material bearing areas respectively, thereby preventing the lateral expansion of the grouting material and improving the axial compression strength of the grouting material in the bearing areas;

3) and the construction error is considered, so that the minimum gap of the bearing area can meet the filling degree requirement of the pore canal grouting.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention;

FIG. 2 is a schematic illustration of the compression of an embodiment of the present invention;

FIG. 3 is a schematic view of a female connector according to an embodiment of the present invention;

description of the figures

1-a sub-linker;

2-female joint;

201-side waist length; 202-round angle length;

203-bottom surface bottom side length;

3, locking the notch; 4, filling gaps;

5, grouting material bearing areas on the side surfaces; 6-bottom grouting material bearing area.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 shows a schematic cross-sectional view of an embodiment of the invention. As shown in figure 1, the invention provides a steel plate fore shaft grouting connecting device for trenchless underground structures, a sub-joint 1 is inserted into a female joint 2 to realize linkage by being pulled or pushed by external force, and a bottom grouting material bearing area 6 and two side grouting material bearing areas 5 are formed between the outer wall of the sub-joint 1 and the inner wall of the female joint 2. The bottom grouting material bearing area 6 and the two side grouting material bearing areas 5 are in a shape with a wide middle and small ends, and grouting materials are injected into the bottom grouting material bearing area 6 and the two side grouting material bearing areas 5 to be hardened so as to realize connection between the two adjacent areas. As shown in fig. 2, when the locking notch 3 is pressed, the bottom grouting material bearing area 6 bears pressure in the horizontal direction, and when the locking notch 3 is pulled, the two side grouting material bearing areas 5 bear pressure in the thickness direction.

The external shape of the sub-joint 1 is non-circular, in this embodiment, the sub-joint is triangular and stable, a gap 4 is arranged between the contact surface of the sub-joint and the contact surface of the female joint 2, and the outer contact surface of the sub-joint is a circular arc surface and bears the pressure applied by the grouting material on the interface.

The shape of the sub-joint 1 is any one of polygons, such as a square shape, the surface of a steel plate where the sub-joint 1 is located is vertical to the surface of a steel plate of the female joint 2, and the opposite round angle is more suitable for being expanded into a pressed core area than the adjacent side. When fore shaft 3 is pressed, the thickness direction of the fillet core area is consistent with that of the female joint steel plate, the length of the bearing area is small, the stress is large, and the stress is unfavorable. Therefore, from the perspective of pressure transmission, the triangular sub-joint is more suitable for connection of steel plate locking grouting.

The inner wall of the female joint is a triangular cylinder with profile connection, as shown in fig. 3, the triangular cylinder is formed by smoothly connecting a side waist length 201, a fillet length 202 and a bottom surface bottom side length 203, the structure is symmetrical, and the non-circular surface can resist torsion; the whole appearance of the female joint is in a claw shape for clamping objects, and the male joint 1 is inserted into the female joint 2 with good mechanical strength through the lock opening 3, so that the transmission of the tensile force of the lock opening 3 is ensured. The normal line of the bottom surface of the female joint 2 is at the center and is superposed with the axis of the steel plate where the female joint 2 is located, so that the pressure transmission of the locking port is ensured.

The joint 4, the bottom grouting material bearing area 6 and the two side grouting material bearing areas 5 are synchronously and evenly grouted, the stress balance of the sub-joint 1 is maintained, the sub-joint is static, and the thickness of the joint 4 is kept uniform. The grouting material adopts compensation shrinkage grouting material which is divided into three parts of a locking notch 3, joint filling 4 and a bearing area.

The grout of the locking notch 3 is to close the locking notch.

The space width of the grouting material of the joint filling 4 meets the requirements of convenient assembly, grouting and easiness, the width of the joint filling 4 has an influence on the reinforcement of the ferrule of the grouting material, and the width of the joint filling 4 is not suitable to be large. If the width of the joint 4 is large, the reinforcement of the grouting material hoop in the bearing area is weak, and the requirement on the performance index of the grouting material is high.

The bottom grouting material bearing area 6 and the two side grouting material bearing areas 5 are the grouting material bearing areas shaped like Chinese date pits, the middle of each grouting material bearing area is wide, the two ends of each grouting material bearing area are small, and the grouting materials are reinforced by hoops and have the advantages of high strength, light weight, good plasticity, fatigue resistance and impact resistance of common hooped concrete. The cross section structure analysis adopts a plane strain model and has no strain along the longitudinal axis direction. By means of the steel materials of the sub-connector 1 and the female connector 2 and the hoop effect of the grouting material of the joint 4 on the grouting material of the bottom grouting material bearing area 6 and the grouting material of the two side grouting material bearing areas 5, the grouting materials of the bottom grouting material bearing area 6 and the two side grouting material bearing areas 5 are in a three-dimensional stress state, gaps in the bearing areas bulge, pore grouting filling degree is good, when locking openings on two sides are closed, the grouting materials are compressed, and the grouting materials of the bottom grouting material bearing areas 6 and the two side grouting material bearing areas 5 have higher compressive strength and deformation capacity. The side grouting material bearing area 5 and the bottom grouting material bearing area 6 are grouting material bearing areas when the locking opening is pulled and pressed respectively.

The concrete embodiment of the invention is applied to a spliced underground steel-concrete composite structure for trenchless construction, the connection is used for butting steel plates, and flanges of adjacent steel pipes are butted, namely, the adjacent steel pipes are connected.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.