CN116006217B - Pipe curtain structure and construction method thereof - Google Patents
Pipe curtain structure and construction method thereof Download PDFInfo
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- CN116006217B CN116006217B CN202211683652.0A CN202211683652A CN116006217B CN 116006217 B CN116006217 B CN 116006217B CN 202211683652 A CN202211683652 A CN 202211683652A CN 116006217 B CN116006217 B CN 116006217B
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- 238000010276 construction Methods 0.000 title claims abstract description 26
- 238000003466 welding Methods 0.000 claims abstract description 50
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 32
- 210000001503 joint Anatomy 0.000 claims abstract description 16
- 239000002689 soil Substances 0.000 claims description 16
- 238000007569 slipcasting Methods 0.000 abstract description 22
- 239000002002 slurry Substances 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 241001391944 Commicarpus scandens Species 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 18
- 239000010959 steel Substances 0.000 description 18
- 238000009412 basement excavation Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 210000000988 bone and bone Anatomy 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012999 compression bending Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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Abstract
The invention discloses a pipe curtain structure and a construction method thereof, relates to the technical field of underground engineering construction, and solves the problems that in the existing pipe curtain welding process, a welding seam is narrow in construction space, the quality of the welding seam cannot be guaranteed, the welding seam is easy to break, slurry in the pipe curtain is not densely filled, and a cavity exists, and the concrete scheme is as follows: the utility model provides a pipe curtain structure, includes a plurality of pipe curtain main parts that connect gradually, every pipe curtain main part both ends are equipped with the incision in order to provide the welding space, and the incision butt joint of two adjacent pipe curtain main parts, adjacent pipe curtain main part butt joint department inner wall welding reinforcing plate, incision department welding pipe curtain apron, the inside axial of pipe curtain main part sets up first slip casting pipe, is equipped with a plurality of one-way contrary holes on the first slip casting pipe for carry out the slip casting that pressurizes in order to fill the cavity, a plurality of second slip casting pipes of pipe curtain main part outer wall fixation.
Description
Technical Field
The invention relates to the technical field of underground engineering construction, in particular to a pipe curtain structure and a construction method thereof.
Background
In recent years, underground space construction rapidly progresses, the surrounding environment faced by the underground space construction is also gradually complicated, and engineering construction such as underpass, proximity and the like becomes normal. When the underground space is used for the engineering of underpass, proximity sensitive buildings, important roads and the like, the influence on the existing building (structure) is necessarily generated, and certain reinforcing measures are needed to control the construction influence of the underground space. The pipe curtain has the advantages of high supporting rigidity and strong deformation resistance, and is widely applied to construction influence control. The length of the current common pipe curtain is about 4-6m, the diameter of the steel pipe is 150-600 mm, and cement slurry is poured after all the steel pipes are jacked in, so that the pipe curtain structure is formed. Before the steel pipe is erected, a foundation pit or a temporary pilot tunnel is required to be excavated in advance to serve as a pipe curtain construction platform, and the steel pipe is jacked in, welded and continuously jacked in the construction platform until the design length is met.
The inventor finds that the pipe curtain construction platform is often small in space due to cost and safety control, so that the height of a bottom welding line from the bottom of the platform is small in the pipe curtain welding process, manual welding is difficult, the quality of the welding line is difficult to ensure, and the pipe curtain is easy to break along the welding line in the jacking process. Meanwhile, when the pipe curtain is borne, the bottom is often used as a tension area, the steel pipe is of a main tension structure, and once a bottom welding line is cracked, the bottom is easy to crack, so that the pipe curtain is not born and loses efficacy and the like. In addition, after the pipe curtain is jacked, cement slurry filling is required to be poured to improve bending rigidity, and the slurry expansion often causes the uncompacted filling of the top of the pipe curtain, the top of the pipe curtain is used as a pressed area, a cement filling body is a main pressed structure, and the pipe curtain bearing is seriously influenced when the top filling is insufficient.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a pipe curtain structure and a construction method thereof, the cut of two adjacent pipe curtain main bodies are in butt joint, so that the operation space for constructing a first welding line in the pipe curtain is ensured, and meanwhile, the arrangement of the cut is convenient for installing a reinforcing plate and improving the connection strength between the pipe curtain main bodies; the inside first slip casting pipe that is equipped with one-way contrary hole of pipe curtain main part can realize the pressurization slip casting in order to solve the inside thick liquid of pipe curtain structure and fill incompact, has the technical problem of cavity.
In order to achieve the above object, the present invention is realized by the following technical scheme:
in a first aspect, a pipe curtain structure, including a plurality of pipe curtain main parts that connect gradually, every pipe curtain main part both ends are equipped with the incision in order to provide the welding space, and the incision butt joint of two adjacent pipe curtain main parts, adjacent pipe curtain main part butt joint department inner wall welding reinforcing plate, incision department welding pipe curtain apron, the inside axial of pipe curtain main part sets up first slip casting pipe, is equipped with a plurality of one-way contrary holes on the first slip casting pipe for carry out the slip casting that pressurizes in order to fill the cavity, pipe curtain main part outer wall is fixed a plurality of second slip casting pipes.
As a further implementation mode, the notch is positioned at one side of two ends of the pipe curtain main body, the notch is a V-shaped notch, and the shape of the closed end of the two pipe curtain main body notches after being butted is the same as the shape of the pipe curtain cover plate.
As a further implementation mode, the reinforcing plate is positioned on the other side of the two ends of the pipe curtain main body, the radian of the reinforcing plate is matched with the radian of the inner wall of the pipe curtain main body, and the reinforcing plate and the inner wall of the pipe curtain form a reinforcing plate welding seam.
As a further implementation mode, the radian of the outer side of the pipe curtain cover plate is the same as that of the outer side of the pipe curtain main body, and a pipe curtain cover plate welding line is formed between the pipe curtain cover plate and the notch of the pipe curtain main body.
As a further implementation mode, the first grouting pipes inside each pipe curtain main body are fixedly connected through a sleeve, the sleeve is located at the notch, rubber pads are arranged on two sides of the inner wall of the sleeve, and the rubber pads are conical to tightly press the first grouting pipes.
As a further implementation, a first weld within the tube sheet is formed between the ends of adjacent two tube sheet bodies.
As a further implementation mode, the second grouting pipes are axially arranged along the pipe curtain main bodies, the second grouting pipes on the two adjacent pipe curtain main bodies are in butt joint, and the second grouting ends are uniformly arranged along the circumferential direction of the outer wall of the pipe curtain main bodies.
As a further implementation, the second grouting pipe has an inner diameter greater than the first grouting pipe.
In a second aspect, a construction method of a pipe curtain structure includes the steps of:
after the pipe curtain pilot pit is excavated, a pipe jacking machine is installed, and the first pipe curtain main body is jacked into a soil layer by the pipe jacking machine;
the second pipe curtain main body is in butt joint with the notch of the first pipe curtain main body, a first welding line in the pipe curtain is constructed, then a reinforcing plate is welded, a sleeve is used for connecting two adjacent grouting pipes, a pipe curtain cover plate is welded, and the cycle is performed until all pipe curtain main bodies are jacked into a soil layer;
and (3) carrying out primary grouting outside the pipe curtain main body, carrying out pressurizing secondary grouting through the first grouting pipe after the primary grouting is solidified so as to fill the internal cavity, and carrying out tertiary grouting outside the pipe curtain main body through the second grouting pipe to form the pipe curtain structure.
As a further implementation mode, after the pipe jacking machine is installed, the rear end of the pipe jacking machine is matched with a counter-force bracket, and the counter-force bracket is supported on the side wall of the pipe curtain pilot pit;
before grouting, the pipe jacking machine is shifted by using a gantry crane to leave a working space.
The beneficial effects of the invention are as follows:
1. the pipe curtain main body with the notches at the two ends is used for construction, the notches are arranged, the structure can be welded from the inside of the pipe curtain, the problems that the bottom of the pipe curtain is close to the bottom of a foundation pit, the welding space is small, dangers are easy to occur during welding and the like are effectively solved, the welding efficiency is improved, and the safety is greatly improved.
2. The arrangement of the reinforcing plate enhances the strength of the joint of the pipe curtain steel pipes, can effectively solve the problem of compressive bending fracture of the joint of the pipe curtain caused by insufficient joint strength, and improves the safety of the whole structure; and meanwhile, the arrangement of the notch also provides a construction space for welding the reinforcing plate.
3. The invention can realize multistage grouting, thereby solving the problem of insufficient grouting at two ends in the pipe curtain. Firstly, injecting and entraining thicker bone slurry into the pipe curtain through a natural flow mode, secondly, injecting slurry into the pipe curtain through an inner first grouting pipe in a pressurizing grouting mode after the primary grouting slurry is solidified, and arranging a check valve in the grouting pipe, so that the problem that the primary grouting blocks the inner grouting pipe can be avoided, and the slurry can be ensured to flow into the pipe curtain to fill the cavity in a pressurizing mode. And finally, carrying out pressurized grouting on soil layers among the pipe curtain steel pipes through an external grouting pipe, enhancing the connection among the pipe curtain steel pipes and improving the stability of the stratum.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic view of a main body of a pipe curtain according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a first grouting pipe connected by a sleeve according to an embodiment of the present invention.
FIG. 3 is a schematic view of the end of the main body of the pipe curtain according to the embodiment of the present invention.
FIG. 4 is a schematic view of a pipe screen pit according to an embodiment of the present invention.
FIG. 5 is a schematic view of the structure of the pipe curtain where the pipe curtain body is abutted in the embodiment of the invention.
FIG. 6 is a schematic illustration of grouting in an embodiment of the invention.
FIG. 7 is a schematic view of a pipe curtain carrying structure according to an embodiment of the present invention.
In the figure: the mutual spacing or dimensions are exaggerated for the purpose of showing the positions of the various parts, and the schematic illustration is only schematic.
Wherein: 1. the pipe curtain comprises a pipe curtain main body, a second grouting pipe, a reinforcing plate, a first grouting pipe, a one-way check hole, a pipe curtain cover plate, a sleeve, a slurry seepage preformed hole, a rubber pad, a pipe curtain cover plate welding seam, a pipe curtain inner first welding seam, a reinforcing plate welding seam, a pipe curtain pilot pit, a pilot tunnel excavation and a stratum reinforcing area.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Example 1
In an exemplary embodiment of the present invention, referring to fig. 1 to 5, a pipe curtain structure includes a plurality of pipe curtain bodies 1 welded in sequence, each pipe curtain body 1 having the same cut at both ends to provide a welding space, and when two pipe curtain bodies 1 are butted, the cut of the adjacent pipe curtain bodies 1 are butted. The inner wall of the butt joint of the adjacent pipe curtain main bodies 1 is welded with a reinforcing plate 3, and the cut is welded with a pipe curtain cover plate 6.
When the pipe curtain main body (steel pipe) is welded, the bottom of the pipe curtain main body 1 is close to the bottom of the foundation pit, so that the welding space is small, and dangers are easy to occur during welding. Through notched setting, can follow the pipe curtain main part inside and weld the structure, effectively solved the inconvenient scheduling problem of welding, improved welding efficiency simultaneously and the security obtains very big improvement.
The incisions in this embodiment are located at one side of two ends of the pipe curtain main body 1, the incisions are V-shaped incisions, and the reinforcing plate 3 is located at the other side of the inner walls of two ends of the pipe curtain main body 1. The incisions at the two ends of the pipe curtain main body 1 are prefabricated in a factory in advance, and the two pipe curtain main bodies 1 with the incisions can be directly installed in actual construction, so that the operation space of the pipe curtain main body 1 in welding is enlarged, and the pipe curtain main body is convenient and reliable.
Considering that the pipe curtain is easy to break along the welding line in the jacking process. Meanwhile, when the pipe curtain is born, the bottom is often used as a tension area, the steel pipe is used as a tension structure, once a bottom welding seam is cracked, the bottom is easy to crack, so that the pipe curtain is born and loses efficacy, and the like, in the embodiment, the inner wall of the butt joint part of the adjacent pipe curtain main bodies 1 is welded with the reinforcing plate 3, and the radian of the reinforcing plate 3 is matched with the radian of the inner wall of the pipe curtain main bodies.
Before the reinforcing plate 3 is constructed, the two butted ends of the pipe curtain main body 1 are required to be welded, and a first welding line 11 inside the pipe curtain is formed after welding. After the first welding line 11 inside the pipe curtain is constructed, the reinforcing plate 3 is installed and welded, and the welding line 12 of the reinforcing plate is formed at the butt joint position inside the pipe curtain main body 1.
The bottom surface of the reinforcing plate 3 is attached to the lower side of the inner wall of the pipe curtain main body, and the edge of the steel sheet (reinforcing plate) is welded with the inner wall of the pipe curtain main body 1; the strength of junction between the pipe curtain main part has been strengthened in setting up of reinforcing plate 3, can effectively solve pipe curtain main part 1 junction because of the not enough cracked problem of pressurized bending that takes place of joint strength, has improved overall structure's security.
The shape of the closed shape of the two pipe curtain main bodies 1 after the cut butt joint is the same as the shape of the pipe curtain cover plate 6, after the two pipe curtain main bodies 1 are butt-jointed and welded, the pipe curtain is closed through the pipe curtain cover plate 6, the pipe curtain cover plate 6 is aligned with the line of the cut and welded, and a pipe curtain cover plate welding seam 10 is formed, and it is understood that the outer radian of the pipe curtain cover plate 6 is the same as the outer radian of the pipe curtain main body.
As shown in fig. 1, after the pipe curtain main bodies 1 are welded and pushed into the soil layer, a grouting process is required. The first grouting pipe 4 is axially arranged inside the pipe curtain main body, a plurality of unidirectional check holes 5 are uniformly distributed on the first grouting pipe and used for carrying out secondary pressurized grouting to fill the cavity, a plurality of second grouting pipes 2 are fixed on the outer wall of the pipe curtain main body 1, and when the secondary pressurized grouting is carried out, slurry in the first grouting pipe 4 can pass through the unidirectional check holes 5, so that the cavity and the cavity reserved by primary grouting inside the pipe curtain are filled, and the grouting effect is ensured; in addition, the unidirectional non-return hole 5 can ensure that the slurry can not enter the first grouting pipe 4 to be blocked during one grouting.
As shown in fig. 2, the first grouting pipes inside each pipe curtain main body are fixedly connected through the sleeve 7, the sleeve 7 is located at the notch, the notch is formed, the sleeve 7 is convenient to place, the rubber pads 9 are installed on two sides of the inner wall of the sleeve 7, the rubber pads 9 are conical rubber pads, the pressure of the rubber pads 9 is gradually increased along with the jacking of the pipe curtain main body 1 into the soil layer, the grouting problem of the first grouting pipe 4 is effectively solved, and the stability of the grouting pipe is guaranteed.
It will be appreciated that during construction, it is necessary to join the two first grouting pipes 4 via the sleeve 7, and then to weld the pipe curtain cover plate to close the cut-out in the pipe curtain. The first grouting pipe 4 is used for secondary pressurized grouting and fills a cavity left in the pipe curtain main body during primary grouting.
As shown in fig. 1 and 3, the second grouting pipes 2 are axially arranged along the pipe curtain main bodies 1, the second grouting pipes 2 on two adjacent pipe curtain main bodies are in butt joint and welded, and the second grouting pipes 2 are uniformly arranged along the circumferential direction of the outer wall of the pipe curtain main bodies. The second grouting pipe 2 has an inner diameter larger than that of the first grouting pipe 4.
Two second grouting pipes 2 are arranged on the periphery of each pipe curtain main body 1 in the embodiment, the length of each second grouting pipe 2 is the same as that of the pipe curtain main body 1, and a plurality of grouting reserved holes 8 are formed in each second grouting pipe 2 and used for three-time grouting.
It can be understood that this embodiment can realize three grouting, firstly pour into to carry thicker bone slurry body in pipe curtain inside in pipe curtain one side through natural flow mode, secondly adopt the pressurization slip casting mode to pour into the inside slip casting of pipe curtain through first slip casting pipe through inside slip casting pipe after once slip casting slurry solidifies, be equipped with one-way contrary hole that ends on the slip casting pipe, both can avoid once grouting to block up inside first slip casting pipe problem, can guarantee that the thick liquid pressurizes and flows into the pipe curtain inside again. And finally, carrying out pressurized grouting on soil layers among the pipe curtain steel pipes through an external second grouting pipe, enhancing the connection among the pipe curtain steel pipes and improving the stability of the stratum.
Example two
A construction method of a pipe curtain structure, which can form the pipe curtain structure of the first embodiment, specifically comprises the following steps:
first, the preparation work before construction is performed, the pipe curtain main body 1 with V-shaped cuts at two ends is prefabricated in a factory in advance, and the second grouting pipes 2 are welded at two sides of the pipe curtain main body, in this embodiment, two second grouting pipes 2 are arranged at the outer side of one pipe curtain main body. The welded state of the second grouting pipe 2 is shown in fig. 2.
Jacking a platform pilot pit for excavation;
first, according to engineering geological data and field actual conditions, a pipe curtain pilot pit 13 is excavated at the middle position of a pipe curtain area, as shown in fig. 4.
Jacking a pipe curtain;
after the pipe curtain pilot pit is excavated, a pipe jacking machine is installed, and the first pipe curtain main body is jacked into a soil layer by the pipe jacking machine; specifically, firstly, the pipe push bench is placed at a designated position by utilizing a gantry crane above the guide pit, a spiral rotary cutter is arranged at the front end of the pipe push bench and used for cutting soil and timely transporting the soil, a counter-force support is arranged at the rear end of the pipe push bench and is supported on the side wall of the pipe curtain guide pit 13 and used for providing counter force to promote the pipe curtain steel pipe to push forward, so that the soil can be discharged and pushed forward at the same time.
Welding a pipe curtain;
after the soil layer is jacked into through the push bench to the preceding section pipe curtain main part, the front end welding of the later section pipe curtain main part is at the end of preceding section steel pipe, and the concrete operation is, at first through outside slip casting pipe mouth of pipe alignment, guarantees that preceding section steel pipe V shape opening is accurate to be connected, because V shape opening exists for the interior space of doing of pipe curtain is great, can be at the inside first welding seam 11 of welding pipe curtain inside the pipe curtain main part, avoids appearing the overhead welding condition when doing then.
And secondly, as the bearing capacity of the welding line is weaker, the bottom is easy to be subjected to compression bending fracture when the pipe curtain is stressed, so that the reinforcing plate 3 is welded at the bottom of the inner side of the pipe curtain body in the pipe curtain body, the rigidity of connection between the steel pipes is improved, and the overall stability of the pipe curtain is improved.
Then the sleeve 7 is used for connecting the first grouting pipes 4 in the two pipe curtain main bodies 1 together, a conical rubber pad is arranged in the sleeve 7, the two grouting pipes and the sleeve are tightly connected in a hammering mode, and meanwhile leakage can be prevented. Finally, the pipe curtain cover plate 6 is welded on the pipe curtain along the V-shaped notch to form a pipe curtain cover plate welding line 10. And each weld joint schematic diagram is shown in fig. 5, and the pipe jacking machine for the pipe jacking completion to be welded pushes the front section pipe curtain main body to continuously jack into the soil layer by jacking the rear section pipe. This is cycled until all of the pipe screen bodies are jacking into the soil layer.
Grouting;
and (3) carrying out primary grouting outside the pipe curtain main body 1, carrying out pressurizing secondary grouting through a first grouting pipe after the primary grouting is solidified so as to fill the internal cavity, and carrying out tertiary grouting outside the pipe curtain main body through a second grouting pipe.
Specifically, because the pipe curtain is placed horizontally, the problem of cavity easily appears at pipe curtain tip after the slip casting of once, need carry out the secondary slip casting in the pipe curtain for this, especially at sleeve 7 inner wall installation wedge rubber pad 9, realize that the inside slip casting pipe of pipe curtain can close connection under external force extrusion, guarantee slip casting process leak-free thick liquid.
After the pipe curtain main body 1 is jacked into the designed position, the pipe pushing bench is shifted by the gantry crane, and a working space is reserved for grouting. And secondly, grouting is carried out once from the outer side of the pipe curtain main body to the inner side of the pipe curtain main body, wherein the grouting material can be concrete with coarse aggregate.
Because the grouting pipe in the pipe curtain is provided with the unidirectional check hole 5, the grouting pipe can ensure that the slurry cannot flow into the grouting pipe during one-time grouting. After the primary grouting slurry is solidified, the interior of the pipe curtain main body is pressurized by the first grouting pipe 4 to carry out secondary grouting, under the action of pressure, the slurry breaks through the one-way check hole 5 and flows into the cavity in the pipe curtain, and then the cavity formed by primary grouting is filled.
And finally, grouting is performed for three times through a second grouting pipe 2 outside the pipe curtain main body 1, so that the slurry permeates into a soil layer between the steel pipes through the reserved holes, the connection between the pipe curtains is enhanced, and then the stability of the stratum where the pipe curtain is located is improved. The pipe curtain grouting is shown in fig. 6.
Backfilling the top tightening platform pilot pit;
after all the pipe curtains are constructed, a stratum reinforcing area 15 is formed, then, pit guiding backfilling is carried out, and subway station construction work such as pit guiding excavation 14 is carried out under the bearing effect of the pipe curtains. A schematic diagram of the pipe curtain structure is shown in fig. 7.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The pipe curtain structure is characterized by comprising a plurality of pipe curtain main bodies which are sequentially connected, wherein two ends of each pipe curtain main body are provided with cuts to provide a welding space, the cuts of two adjacent pipe curtain main bodies are in butt joint, the inner wall of the butt joint of the adjacent pipe curtain main bodies is welded with a reinforcing plate, the cuts are welded with a pipe curtain cover plate, a first grouting pipe is axially arranged in the pipe curtain main body, a plurality of unidirectional check holes are formed in the first grouting pipe and used for pressurized grouting to fill a cavity, and a plurality of second grouting pipes are fixed on the outer wall of the pipe curtain main body;
the notches are positioned at one side of two ends of the pipe curtain main body, the notches are V-shaped notches, and the shape of the closed joint of the two pipe curtain main body notches is the same as the shape of the pipe curtain cover plate;
the reinforcing plate is located the opposite side at the two ends of the pipe curtain main body, the radian of the reinforcing plate is matched with the radian of the inner wall of the pipe curtain main body, and the reinforcing plate and the inner wall of the pipe curtain form a reinforcing plate welding seam.
2. The tube sheet structure of claim 1 wherein the outer curvature of the tube sheet cover is the same as the outer curvature of the tube sheet body, and wherein a tube sheet cover weld is formed between the tube sheet cover and the slit of the tube sheet body.
3. The pipe curtain structure according to claim 1, wherein the first grouting pipes in the pipe curtain main bodies are fixedly connected through sleeves, the sleeves are positioned at the cut parts, rubber pads are arranged on two sides of the inner wall of each sleeve, and the rubber pads are conical to press the first grouting pipes.
4. A pipe curtain structure as claimed in claim 1, wherein a first weld is formed between ends of adjacent pipe curtain bodies.
5. The pipe curtain structure according to claim 1, wherein the second grouting pipes are axially arranged along the pipe curtain main bodies, the second grouting pipes on two adjacent pipe curtain main bodies are in butt joint, and the second grouting pipes are uniformly arranged along the circumferential direction of the outer wall of the pipe curtain main bodies.
6. The pipe curtain structure of claim 5, wherein the second grouting pipe has an inner diameter greater than an inner diameter of the first grouting pipe.
7. The construction method of the pipe curtain structure is characterized by comprising the following steps of:
after the pipe curtain pilot pit is excavated, a pipe jacking machine is installed, and the first pipe curtain main body is jacked into a soil layer by the pipe jacking machine;
the second pipe curtain main body is in butt joint with the first pipe curtain main body incision, a first welding line in the pipe curtain is constructed, then a reinforcing plate is welded, two adjacent first grouting pipes are connected through a sleeve, a pipe curtain cover plate is welded, and the cycle is performed until all pipe curtain main bodies are jacked into a soil layer;
performing primary grouting on the outer side of the pipe curtain main body, performing pressurized secondary grouting through a first grouting pipe after the primary grouting is solidified to fill the internal cavity, and performing tertiary grouting on the outer side of the pipe curtain main body through a second grouting pipe to form the pipe curtain structure according to any one of claims 1-6.
8. The construction method of a pipe curtain structure according to claim 7, wherein after the pipe pushing bench is installed, the rear end of the pipe pushing bench is matched with a counter-force bracket, and the counter-force bracket is supported on the side wall of the pipe curtain guide pit;
before grouting, the pipe jacking machine is shifted by using a gantry crane to leave a working space.
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| CN202211683652.0A CN116006217B (en) | 2022-12-27 | 2022-12-27 | Pipe curtain structure and construction method thereof |
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| CN202211683652.0A CN116006217B (en) | 2022-12-27 | 2022-12-27 | Pipe curtain structure and construction method thereof |
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| CN116006217A (en) | 2023-04-25 |
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