1. The utility model provides a advance support structure for wearing under underground structure, a serial communication port, including pipe canopy (2) with groove precasting arch (3) in advance, pipe canopy (2) are the arch, pipe canopy (2) support the top of groove precasting arch (3) in advance, groove precasting arch (3) in advance is established the groove in advance and is forming at inslot pouring concrete placement in advance through digging at the massif, set up on pipe canopy steel pipe (21) of pipe canopy (2) and have the grout pressing hole, the grout pressing hole with groove intercommunication in advance, the grout pressing hole is used for to the inslot pouring concrete in advance.

2. Forepoling structure for underground structures underpass according to claim 1, characterized in that a preliminary bracing structure (4) is also provided below the pre-slotted pre-built arch (3).

3. Forepoling structure for underground structures underpass according to claim 2, characterized in that a secondary lining structure (5) is also provided below the primary support structure (4).

4. Forepoling structure for underlining of underground structures according to claim 3, characterized in that the secondary lining structure (5) is a reinforced concrete lining.

5. The advance support structure for underground structure underpass according to claim 1, characterized in that the pipe shed (2) comprises at least two rows of pipe shed steel pipes (21), and the adjacent upper and lower rows of pipe shed steel pipes (21) are arranged in a staggered manner.

6. A construction method of a advance support structure for underground structure underpass according to any one of claims 1 to 5, characterized by comprising the steps of:

s1, installing a pipe shed steel pipe (21) on the mountain to form a pipe shed (2);

s2, digging a precutting groove below the pipe shed (2), wherein the precutting groove is communicated with a grouting hole of a pipe shed steel pipe (21);

and S3, pouring concrete into the pre-cut groove through the grouting holes of the pipe shed steel pipes (21) to form the pre-cut groove pre-built arch (3).

7. The construction method according to claim 6, further comprising: and S4, arranging a primary supporting structure (4) below the precutting groove precasting arch (3).

8. The construction method according to claim 7, further comprising: and S5, arranging a secondary lining structure (5) below the primary supporting structure (4).

Background

Along with the rapid development of urban underground traffic, the situation that the existing underground structure is worn under the newly-built underground structure is more and more common, the existing underground structure is easily disturbed and additional deformation is caused in the downward wearing construction, and the normal operation and safety of the existing structure are influenced in serious cases. In order to protect important or sensitive underground structures, during underpass construction, a structure or support with high rigidity is often adopted so as to reduce the deformation of the existing structure, or sufficient advance supports are arranged in front of an excavation surface so as to excavate rock and soil bodies under the protection of the advance supports, so that the stability of the stratum is maintained, and the deformation of the existing structure is reduced. Common forepoling comprises modes of forepoling reinforcement, small conduits, forepoling and the like.

However, the existing forepoling structure still has the problems of insufficient rigidity, safety risk and the like.

Disclosure of Invention

In order to solve the problems that the existing advanced supporting structure can play a supporting role, but has insufficient rigidity, safety risk and the like, the invention innovatively provides the advanced supporting structure for underground structure underpass, the advanced supporting structure is a combined structure of a pipe shed and a pre-grooving pre-built arch, the pre-grooving pre-built arch is a continuous shell structure, and compared with the measures of a common advanced small conduit, an advanced pipe curtain, advanced stratum grouting and the like, a formed reinforcement body or a supporting body has very high rigidity and can effectively resist deformation caused by construction disturbance; and the existence of the pipe shed reduces the stratum loss and deformation in the grooving process of the precutting groove, thereby improving the rigidity of the whole advance support structure and effectively protecting the existing underground structure in operation.

In order to achieve the technical purpose, the invention discloses a pre-support structure for underground structure underpass, which comprises a pipe shed and a pre-cut groove pre-cast arch, wherein the pipe shed is arched, the pipe shed is supported above the pre-cut groove pre-cast arch, the pre-cut groove pre-cast arch is formed by digging a pre-cut groove in a mountain body and pouring concrete in the pre-cut groove, a pipe shed steel pipe of the pipe shed is provided with a grouting hole, the grouting hole is communicated with the pre-cut groove, and the grouting hole is used for pouring concrete in the pre-cut groove.

Furthermore, a primary supporting structure is further arranged below the pre-groove pre-built arch.

Furthermore, a secondary lining structure is further arranged below the primary supporting structure.

Further, the secondary lining structure is a reinforced concrete lining.

Further, the pipe shed comprises at least two rows of pipe shed steel pipes, and the adjacent upper and lower rows of pipe shed steel pipes are arranged in a staggered mode.

The second aspect of the invention discloses a construction method of a forepoling structure for underground structure underpass, which comprises the following steps:

s1, installing a pipe shed steel pipe on the mountain to form a pipe shed;

s2, digging a precutting groove below the pipe shed, wherein the precutting groove is communicated with a grouting hole of a steel pipe of the pipe shed;

and S3, pouring concrete into the pre-cut groove through the grouting holes of the pipe shed steel pipes, and pouring to form the pre-cut groove pre-built arch.

Further, the construction method further comprises the following steps: and S4, arranging a primary supporting structure below the precutting groove pre-built arch.

Further, the construction method further comprises the following steps: and S5, arranging a secondary lining structure below the primary supporting structure.

The invention has the beneficial effects that:

(1) the advanced support structure for underground structure underpass is a combined structure of a pipe shed and a pre-cut groove pre-built arch, wherein the pre-cut groove pre-built arch is a continuous shell structure, and compared with the measures of a common advanced small conduit, an advanced pipe curtain, advanced stratum grouting and the like, a formed reinforcement body or a carrier has high rigidity and can effectively resist deformation caused by construction disturbance; and the existence of the pipe shed reduces the stratum loss and deformation in the grooving process of the precutting groove, thereby improving the rigidity of the whole advance support structure and effectively protecting the existing underground structure in operation.

(2) In the implementation process of the advance support structure for underground structure underpass, the stratum loss and deformation caused by the advance support structure are small; the advanced supporting structure has the characteristic of high rigidity, can effectively reduce the disturbance to the existing structure, reduces the deformation, and under the protection effect, excavates the newly-built underground structure again, can effectively reduce the additional deformation of the existing structure.

Drawings

Fig. 1 is a schematic structural view of a forepoling structure for underpass of an underground structure according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a forepoling structure for underpass of an underground structure according to another embodiment of the present invention;

FIG. 3 is a flow chart of the construction method of the present invention.

In the figure, the position of the upper end of the main shaft,

2. a pipe shed; 21. a pipe shed steel pipe;

3. pre-grooving and pre-arching;

4. a primary support structure;

5. and (5) a secondary lining structure.

Detailed Description

The invention provides a leading support structure for underground structure underpass, which is explained and explained in detail below with reference to the attached drawings.

As shown in fig. 1, the embodiment specifically discloses a advance support structure for underground structure underrun, including pipe canopy 2 and precutting groove prefabricated arch 3, pipe canopy 2 is the arch, and pipe canopy 2 supports in advance the groove prefabricated arch 3's top, and precutting groove prefabricated arch 3 is through digging at the massif and establish precutting groove and at precutting inslot pouring concrete and form, offers on pipe canopy steel pipe 21 of pipe canopy 2 and has had the mud jacking hole, mud jacking hole and precutting groove intercommunication, and the mud jacking hole is used for to precutting inslot pouring concrete. During construction, the pipe shed 2 is installed at first, the pipe shed 2 forms support, then the precutting groove and the poured concrete are dug below the pipe shed 2, the arrangement of the pipe shed 2 reduces stratum loss and deformation in the grooving process of the precutting groove, and the existing underground structure is effectively protected. The pre-grooving pre-built arch 3 is a continuous shell structure, and compared with the measures of a common advanced small conduit, an advanced pipe curtain, advanced stratum grouting and the like, the formed reinforcing body or supporting body has high rigidity and can effectively resist deformation caused by construction disturbance. In the implementation process of the advance support structure, the caused stratum loss and deformation are small; the pipe shed 2 and the pre-grooving pre-built arch 3 jointly enhance the rigidity and the strength of the whole advanced supporting structure.

In the invention, the arch springing shape of the pre-groove pre-built arch 3 can be adjusted according to the geological conditions of the project, and when the geological conditions are better, a common foot-locking anchor rod can be adopted for reinforcement; when the geological condition is poor or loose soil is adopted, an enlarged arch springing can be manufactured, and the stratum is reinforced by adopting a rotary spraying mode below the arch springing so as to improve the stability of the pre-built arch.

And a primary supporting structure 4 is also arranged below the pre-grooving pre-building arch 3. The preliminary bracing structure 4 is a closed-loop annular structure, and the preliminary bracing structure 4 according to the related art may be used, and is preferably formed by casting.

And a secondary lining structure 5 is also arranged below the primary supporting structure 4. The secondary lining structure 5 is a closed-loop annular structure. The secondary lining structure 5 is a reinforced concrete lining.

In another embodiment, as shown in fig. 2, the pipe shed 2 includes at least two rows of pipe shed steel pipes 21, and the adjacent upper and lower rows of pipe shed steel pipes 21 are arranged in a staggered manner, so that the supporting strength is improved, the concrete pouring speed is increased, the formation of the pre-grooving pre-cast arch 3 is accelerated, and the construction period is shortened.

The second aspect of the invention discloses a construction method of a forepoling structure for underground structure underpass, which comprises the following steps as shown in figure 3:

s1, installing a pipe shed steel pipe 21 on the mountain to form a pipe shed 2; the pipe shed 2 may comprise a row of pipe shed steel pipes 21, or a plurality of rows of staggered pipe shed steel pipes 21 may be provided.

And S2, under the protection of the pipe shed 2, adopting pre-grooving mechanical equipment to dig a pre-grooving groove below the pipe shed 2, wherein the pre-grooving groove is communicated with the grouting hole of the pipe shed steel pipe 21.

And S3, pouring concrete into the pre-cut groove through the grouting holes of the pipe shed steel pipes 21, and pouring to form the pre-cut groove pre-built arch 3. The concrete is common concrete or fiber reinforced concrete, and the precutting groove pre-built arch 3 is formed after the concrete is solidified.

The construction method further comprises the following steps: and S4, arranging a primary supporting structure 4 below the precut groove pre-built arch 3.

The construction method further comprises the following steps: and S5, arranging a secondary lining structure 5 below the primary supporting structure 4.

Under the protection of pipe shed 2 and precutting groove prefabricated arch 3, excavate the rock-soil body of newly-built underground structure within range, then pour primary support structure 4 and secondary lining structure 5 in proper order for the disturbance that produces existing underground structure reduces, guarantees its safe in utilization.

The advanced supporting structure for the underground structure to penetrate downwards has the characteristic of high rigidity, and under the protection effect of the advanced supporting structure, a newly-built underground structure is excavated, so that the additional deformation of the existing structure can be effectively reduced. In the invention, the pipe shed 2 and the pre-grooving pre-built arch 3 are combined for use, so that the effect of preventing rock-soil mass collapse in pre-grooving construction can be achieved, and the method has better applicability in urban shallow loose soil mass underground engineering.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "the present embodiment," "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and simplifications made in the spirit of the present invention are intended to be included in the scope of the present invention.