Pre-buried hole water stop device for pipe jacking construction in working well

Abstract

The utility model discloses a pre-buried hole water stop device for pipe-jacking construction in a working well, which comprises a stainless steel mud jacking pipe, an open caisson wall, a pipe-jacking pipe wall and a pipe-jacking pipe body, six grouting port plugs are annularly arranged on the pipe-jacking pipe body, and the grouting port plugs are fixed on a reinforcing mesh of the open caisson wall through positioning reinforcing steel bars. A thick annular steel plate is firstly arranged between the wall of the open caisson and the pipe wall of the jacking pipe for fixing, then micro-expansion concrete is poured, the surface of the open caisson and the pipe wall of the jacking pipe are blocked through a polyethylene foam plate, the polyethylene foam plate is taken out after the micro-expansion concrete is hardened, a groove is reserved, and the groove is filled with the double-component polysulfide sealant. A cavity of a gap between the pipe wall and the soil layer is formed between the wall of the open caisson and the pipe wall of the jacking pipe and is densely filled with cement paste. According to the utility model, the construction key point of the stratum gap is reinforced by researching the process of injecting the cement paste outside the hole in the open caisson pipe-jacking project, so that the ground settlement can be reduced, the cement paste is convenient to inject, the grouting period is shortened, and the construction cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of working well inner pipe jacking construction pre-buried hole water stop device technical field, especially a kind of working well inner pipe jacking construction pre-buried hole water stop device. BACKGROUND

[0002] The sinking well method is to pour concrete on the ground to prefabricate sectional forming structure, and to sink at the designed position by drainage or without drainage, so that the same working well reduces excavation and slope area, and is suitable for occasions with narrow space, high protection requirements of surrounding buildings and the like. The pipe jacking construction adopts trenchless technology, can accurately push the pipeline to avoid obstacles on the ground, has small engineering demolition cost, and fast construction speed.

[0003] The existing working well inner pipe jacking construction pre-buried hole has a gap between the outer wall of the pipe and the stratum soil due to pipe jacking, which is prone to surface subsidence, water leakage, collapse and the like. In order to overcome these disadvantages, the utility model provides a working well inner pipe jacking construction pre-buried hole water stop device. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the shortcomings in the prior art, and provides a working well inner pipe jacking construction pre-buried hole water stop device.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a working well inner pipe jacking construction pre-buried hole water stop device, which comprises a water stop groove, micro-expansion concrete, two-component polysulfide sealant, a stainless steel grouting pipe, a sinking well wall, cement paste, a pipe wall of pipe jacking and a pipe body of pipe jacking. The pipe body of pipe jacking is annularly arranged with six grouting port plugs. The grouting port plugs are fixed on the sinking well wall steel mesh through positioning steel bars, and are poured into the sinking well wall with polyethylene protection. The water stop groove is arranged in the sinking well wall. A 3mm thick annular steel plate is first fixed between the sinking well wall and the pipe wall of pipe jacking, and then micro-expansion concrete is poured. The surface is blocked with 20x20 polyethylene foam board. After the micro-expansion concrete hardens, the polyethylene foam board is removed, leaving a 20x20 recess. The two-component polysulfide sealant fills the 20x20 recess, and blocks the water leakage gap between the sinking well wall and the pipe wall of pipe jacking. The stainless steel grouting pipe is firmly fixed after being bound with the sinking well wall steel bars. The grouting port plugs are arranged at one end of the stainless steel grouting pipe. A check valve is arranged at the other end of the stainless steel grouting pipe. The space between the sinking well wall and the pipe wall of pipe jacking is filled with cement paste.

[0006] Further, the grouting port plug is a DN25 outer square plug, and the inner thread of the plug is 25mm deep.

[0007] Further, the water stop groove is 30mm deep.

[0008] Further, the water stop groove is used for installing the grouting flange and the grouting pipe after the caisson is sunk into place, and the water stop groove is closed by the cement mortar after the cement slurry is completed.

[0009] Further, the stainless steel grouting pipe is DN25mm.

[0010] Further, the check valve is DN25, and the check valve is fixed to a predetermined position of the pipe wall after the caisson wall is bound with the reinforcement.

[0011] The utility model discloses a beneficial effect:

[0012] The utility model discloses a working well inner pipe jacking construction pre -buried hole water stop device, has the following advantages: in the scheme, through being provided with grouting mouth plug, water stop groove, micro -expansion concrete, two -component polysulfide sealant, stainless steel grouting pipe, check valve, cement slurry, through the research hole mouth outside injection cement slurry technology consolidation stratum gap construction key point in the caisson pipe engineering, to solve the stratum clearance leakage, collapse, ground subsidence problem, can be convenient cement slurry injection, shorten the grouting period, reduce construction cost. DRAWINGS

[0013] In order to more clearly illustrate the technical scheme of the utility model, the following will be to the specific implementation mode description needed to use the drawing briefly introduced, obviously, the following description in the drawing is only some embodiments of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0014] Fig. 1 The overall structure plan of the utility model discloses a working well inner pipe jacking construction pre -buried hole water stop device, has the following advantages: in the scheme, through being provided with grouting mouth plug, water stop groove, micro -expansion concrete, two -component polysulfide sealant, stainless steel grouting pipe, check valve, cement slurry, through the research hole mouth outside injection cement slurry technology consolidation stratum gap construction key point in the caisson pipe engineering, to solve the stratum clearance leakage, collapse, ground subsidence problem, can be convenient cement slurry injection, shorten the grouting period, reduce construction cost.

[0015] Fig. 2 The utility model discloses a working well inner pipe jacking construction pre -buried hole water stop device, has the following advantages: in the scheme, through being provided with grouting mouth plug, water stop groove, micro -expansion concrete, two -component polysulfide sealant, stainless steel grouting pipe, check valve, cement slurry, through the research hole mouth outside injection cement slurry technology consolidation stratum gap construction key point in the caisson pipe engineering, to solve the stratum clearance leakage, collapse, ground subsidence problem, can be convenient cement slurry injection, shorten the grouting period, reduce construction cost.

[0016] The following marks are as follows:

[0017] 1, grouting mouth plug;2, water stop groove;3, micro -expansion concrete;4, two -component polysulfide sealant;5, stainless steel grouting pipe;6, check valve;7, caisson wall;8, cement slurry;9, pipe wall of pipe jacking;10, pipe body of pipe jacking. Specific implementation mode

[0018] The following will be to the specific implementation mode description needed to use the drawing briefly introduced, obviously, the following description in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0019] like Figs. 1-2 As shown, a pre-embedded water-stopping device for pipe jacking construction in a working well includes a water-stopping groove 2, micro-expansion concrete 3, two-component polysulfide sealant 4, stainless steel grouting pipe 5, a caisson wall 7, cement grout 8, pipe wall 9, and pipe body 10. Six grouting port plugs 1 are arranged in a ring around the pipe body 10. The grouting port plugs 1 are fixed to the reinforcing mesh of the caisson wall 7 by positioning steel bars and are poured into the caisson wall 7 with polyethylene protection. Markings are made for easy location. The water-stopping groove 2 is set inside the caisson wall 7. A 3mm thick annular steel plate is first installed and fixed between the caisson wall 7 and the pipe wall 9, and then micro-expansion concrete 3 is poured in and hydrated. During this process, an expansion agent is used to expand and compensate for the shrinkage of the concrete. The surface is sealed with 20x20 polyethylene foam board. After the micro-expansion concrete hardens, the polyethylene foam board is removed, leaving a 20x20 groove. Two-component polysulfide sealant 4 is used to fill the 20x20 groove to stop the water leakage gap between the caisson wall 7 and the jacking pipe wall 9. The stainless steel grouting pipe 5 is firmly positioned after the steel reinforcement of the caisson wall 7 is tied. The grouting port plug 1 is set at one end of the stainless steel grouting pipe 5, and a check valve 6 is set at the other end of the stainless steel grouting pipe 5. The cavity between the caisson wall 7 and the jacking pipe wall 9, which forms a gap between the pipe wall and the soil layer, is filled with cement grout 8.

[0020] Specifically, the grouting port plug 1 is a DN25 external square thread plug with an internal thread depth of 25mm.

[0021] Specifically, the water-stop groove is 30mm deep.

[0022] Specifically, the water-stop groove 2 is used to install the grouting flange and grouting pipe to increase the operating space after the caisson is lowered into place in four stages. After the cement grout 8 is completed, the water-stop groove 2 is sealed with 1:2 cement mortar.

[0023] Specifically, the stainless steel grouting pipe 5 is DN25mm.

[0024] Specifically, the check valve 6 is DN25, and the check valve 6 is fixed to the predetermined position on the pipe wall after the steel bars of the caisson wall 7 are tied.

[0025] Working principle: During use, a caisson jacking project is implemented. The caisson has an inner diameter of 7000mm, an outer diameter of 8200mm, and a depth of 18000mm. The jacking pipe has an inner diameter of 2400mm, an outer diameter of 3000mm, a wall thickness of 300mm, a reserved opening of 3300mm in the caisson, and a jacking pipe length of 100m. In construction, the caisson is constructed first, followed by the jacking pipe. First, a stainless steel grouting pipe 5 is embedded in the caisson wall 7, and a water-stop groove 2 and a check valve 6 are set up for protection. After the caisson is lowered into place, the pipe is jacked in. Cement grout 8 is injected into the gap between the pipe wall and the soil layer through the stainless steel grouting pipe 5. The cement grout 8 forms a cavity between the pipe wall and the soil layer between the caisson wall 7 and the jacking pipe wall 9, preventing water leakage, soil collapse, and surface subsidence. It can reduce the amount of ground settlement, facilitate cement grout injection, shorten the grouting period, and reduce construction costs.

[0026] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A pre-embedded water-stopping device for pipe jacking construction in a working well, characterized in that: The structure includes a water-stop groove (2), micro-expansion concrete (3), two-component polysulfide sealant (4), stainless steel grouting pipe (5), caisson wall (7), cement grout (8), jacking pipe wall (9), and jacking pipe body (10). The jacking pipe body (10) has six grouting port plugs (1) arranged in a ring. The grouting port plugs (1) are fixed to the steel mesh of the caisson wall (7) by positioning steel bars and poured into the caisson wall (7) with polyethylene protection. The water-stop groove (2) is set in the caisson wall (7). A 3mm thick annular steel plate is first installed between the caisson wall (7) and the jacking pipe wall (9) for fixation, and then micro-expansion concrete (3) is poured in. The surface is coated with... A 20x20 polyethylene foam board is used for sealing. After the micro-expansion concrete hardens, the polyethylene foam board is removed, leaving a 20x20 groove. The two-component polysulfide sealant (4) is used to fill the 20x20 groove to stop the water leakage gap between the caisson wall (7) and the jacking pipe wall (9). The stainless steel grouting pipe (5) is fixed in position after the steel reinforcement of the caisson wall (7) is tied. The grouting port plug (1) is set at one end of the stainless steel grouting pipe (5). A check valve (6) is set at the other end of the stainless steel grouting pipe (5). The cavity between the caisson wall (7) and the jacking pipe wall (9) that forms a gap between the pipe wall and the soil layer is filled with cement grout (8) to make it dense.

2. The pre-embedded water-stopping device for pipe jacking construction in a working well according to claim 1, characterized in that: The grouting port plug (1) is a DN25 external square thread plug with an internal thread depth of 25mm.

3. The pre-embedded water-stopping device for pipe jacking construction in a working well according to claim 1, characterized in that: The water-stop groove (2) is 30mm deep.

4. The pre-embedded water-stopping device for pipe jacking construction in a working well according to claim 1, characterized in that: The water-stop groove (2) is used to install the grouting flange and grouting pipe after the caisson has sunk into place. After the cement grout (8) is completed, the water-stop groove (2) is sealed with cement mortar.

5. A pre-embedded water-stopping device for pipe jacking construction in a working well according to claim 1, characterized in that: The stainless steel grouting pipe (5) is DN25mm.

6. The pre-embedded water-stopping device for pipe jacking construction in a working well according to claim 1, characterized in that: The check valve (6) is DN25 and is fixed to a predetermined position on the pipe wall after the reinforcing steel bars of the caisson wall (7) are tied.

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