CN112796329A - In-situ protection structure for foundation pit pipeline at subway entrance and exit by open cut method and construction method - Google Patents
In-situ protection structure for foundation pit pipeline at subway entrance and exit by open cut method and construction method Download PDFInfo
- Publication number
- CN112796329A CN112796329A CN202110115305.7A CN202110115305A CN112796329A CN 112796329 A CN112796329 A CN 112796329A CN 202110115305 A CN202110115305 A CN 202110115305A CN 112796329 A CN112796329 A CN 112796329A
- Authority
- CN
- China
- Prior art keywords
- pipeline
- steel
- foundation pit
- main
- protection structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses an in-situ protection structure and a construction method for a foundation pit pipeline at an entrance and an exit of a subway by an open cut method, wherein the in-situ protection structure for the pipeline comprises a support pile, a profile steel main beam, a profile steel secondary beam, a grid steel frame and a height adjusting bolt; connecting pieces are pre-buried in the supporting piles, and the supporting piles are connected with the section steel main beams and the grid steel frames through the connecting pieces; the profile steel secondary beam penetrates through the bottom of the pipe and is lapped on the main beam, the height adjusting bolt is arranged on the profile steel main beam, and the height of the profile steel secondary beam is adjusted through the height adjusting bolt, so that the profile steel secondary beam is tightly attached to a protected pipeline to form a pipeline in-situ protection structure. According to the invention, by combining the pipeline in-situ protection structure and the foundation pit support structure, the pipeline is prevented from being changed, the construction period is effectively shortened, the engineering cost is saved, the problem of overlarge space between the support piles at two sides of the pipeline is solved, the safety of the foundation pit is ensured, and the method has strong popularization value.
Description
Technical Field
The invention belongs to the technical field of underground engineering, and particularly relates to an in-situ protection structure for a foundation pit pipeline at an entrance and an exit of a subway by an open cut method and a construction method.
Background
Along with the continuous development of society, the urban underground space field is constantly developed, can inevitably meet the condition that subway access & exit foundation ditch and municipal pipeline intersect, in order to guarantee the safety of foundation ditch and reduce the influence to the pipeline, traditional way is to change the pipeline into the place, and the station restores to the original state after the construction is accomplished. However, in the actual process, some pipelines are difficult to move and change due to various factors, and only can be protected in situ.
Whether a temporary migration or in-situ protection mode is adopted, the following problems exist:
1) the pipeline moving and changing can increase the construction cost, and meanwhile, multiple times of coordination and butt joint are needed, so that the construction period is longer.
2) The pipeline has taken the position is established in beating of foundation ditch fender pile, considers the influence of construction fender pile to the pipeline simultaneously, reserves construction safe distance to lead to two fender pile intervals in pipeline both sides too big, and then influence the safety of foundation ditch.
Disclosure of Invention
In order to solve the technical problems, the invention provides a pipeline in-situ protection structure for a foundation pit at an entrance and an exit of a subway by an open cut method and a construction method.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the pipeline in-situ protection structure comprises a support pile, a profile steel main beam, a profile steel secondary beam, a grid steel frame and a height adjusting bolt, wherein a connecting piece is pre-embedded in the support pile, and the support pile is connected with the profile steel main beam and the grid steel frame through the connecting piece; the profile steel secondary beam penetrates through the bottom of a protected pipeline and is lapped on the profile steel main beam, the height adjusting bolt is arranged on the profile steel main beam, and the height of the profile steel secondary beam is adjusted through the height adjusting bolt, so that the profile steel secondary beam is tightly attached to the protected pipeline to form a pipeline in-situ protection structure.
Preferably, the supporting pile on the same side of the protected pipeline is reliably connected with the main section steel beam through the connecting piece, a lifting rib is arranged between the supporting column and the main section steel beam, one end of the lifting rib is welded with the main rib of the supporting pile, and the other end of the lifting rib is welded on the main section steel beam; the supporting piles on the two sides of the protected pipeline are reliably connected with the grid steel frame through the connecting pieces.
Preferably, the pile diameter of the support pile is larger than that of the general section guard pile.
Preferably, a connecting piece is embedded in the supporting pile in advance, the connecting piece is composed of anchor bars and arc-shaped steel plates, the size of each steel plate is 5-10 cm larger than the width of a wing plate and the height of a web plate of the section steel main beam, and the section steel main beam and the connecting piece can be welded under the condition of construction errors.
Preferably, in order to ensure the reliable connection between the supporting piles on the two sides of the foundation pit and the main beam of the profile steel, a lifting rib is additionally arranged between the supporting column and the main beam of the profile steel, one end of the lifting rib is welded with the main rib of the supporting pile, and the other end of the lifting rib is welded on the main beam of the profile steel.
Preferably, the length of the profile steel secondary beam is not less than the sum of the pile distance and the pile diameter on two sides of the protected pipeline; one end of the profile steel secondary beam, which is driven into the soil layer, is pointed, so that the profile steel secondary beam is driven into the soil layer more easily.
Preferably, four holes are drilled in the top wing plate of the profile steel main beam at the intersection of the profile steel main beam and the profile steel secondary beam, threads are arranged on the inner wall of each hole, nuts are welded at the bottoms of the holes, and four height adjusting bolts are matched to adjust the height of the profile steel secondary beam.
Preferably, the supporting piles between the two sides of the pipeline are connected with the grid steel frame through the connecting pieces, and advanced small guide pipes are arranged for ensuring the safety of foundation pit excavation and spraying and mixing among the piles.
In a second aspect, an embodiment of the present invention further provides a construction method for an in-situ protection structure for a foundation pit pipeline at an entrance and an exit of an open cut subway, where the method includes the following steps:
firstly, driving four supporting piles on two sides of a protected pipeline and a foundation pit;
constructing a crown beam and a first enclosure support, and then excavating a foundation pit to the bottom elevation of the protected pipeline;
excavating a soil layer on one side of the protected pipeline to the elevation of the bottom of the section steel girder;
chiseling concrete at the positions of two main beams of the support piles at the excavation side and the position of a hanging rib, welding the section steel main beam with a connecting piece, welding one end of the hanging rib with a main rib of the support pile, and welding the other end of the hanging rib on the section steel main beam;
horizontally driving a profile steel secondary beam into the top surface of the excavation side-attached profile steel main beam to a designed position;
excavating a soil layer on the other side of the protected pipeline to the elevation of the bottom of the main section steel beam, and constructing the main section steel beam on the side in the fourth synchronous step, so that the secondary section steel beam is lapped on the main section steel beam;
seventhly, height adjustment is carried out on the profile steel secondary beam through a height adjusting bolt fixed on the profile steel main beam according to the construction reserved space and the construction error, so that the profile steel secondary beam is tightly attached to the bottom of the protected pipeline, and a pipeline deformation space is not reserved;
step eight, excavating soil layers at the position of the construction pipeline in a layered mode, chiseling concrete at the position of a grid steel frame between support piles at two sides of the protected pipeline, leaking out a connecting piece, and welding the grid steel frame and the connecting piece; then, an advanced small guide pipe is arranged, and the downward layered excavation is continued after the spraying and mixing among the piles.
Preferably, in step three and step six: when soil layers on two sides of the protected pipeline are excavated, a manual excavation mode is adopted, the soil layer at the bottom of the protected pipeline is guaranteed not to be disturbed as much as possible, and the protected pipeline is prevented from deforming.
Preferably, in the fourth step and the eighth step: the steel section main beam, the grid steel frame, the connecting piece and the hanging rib are welded by double-sided welding, the welding quality is ensured, and reliable connection is formed among the steel section main beam, the grid steel frame, the connecting piece and the hanging rib.
Preferably, in step five: and strictly controlling the construction precision when the profile steel secondary beam is arranged, and controlling the elevation deviation within +/-10 mm.
Preferably, in step seven: the steel section main beam can be properly and integrally moved down for a certain distance during construction, protected pipelines are not damaged when the steel section secondary beam is arranged, and sundries on the contact surface of the protected pipelines and the steel section secondary beam are washed by a high-pressure water gun before height adjustment is carried out.
The invention has the following beneficial effects:
according to the in-situ protection structure and the construction method for the foundation pit pipeline at the subway entrance/exit by the open cut method, the pipeline can be prevented from being changed, the construction period is effectively shortened, the construction cost is saved, and the popularization value is high; the pipeline in-situ protection structure is combined with the enclosure structure, so that the problem of overlarge space between the enclosure piles on two sides of the pipeline can be solved, the safety of a foundation pit is ensured, and the pipeline in-situ protection structure has strong market competitiveness.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an in-situ pipeline protection structure according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an in-situ pipeline protection structure according to an embodiment of the present invention;
FIG. 3 is a schematic plan view of an in-situ pipeline protection structure according to an embodiment of the present invention;
FIG. 4 is a schematic view of a section steel main beam and support pile node according to an embodiment of the invention;
FIG. 5 is a schematic view of a grid steel frame and support pile node according to an embodiment of the present invention;
fig. 6 is a schematic view of a height adjustment bolt node according to an embodiment of the present invention.
Description of reference numerals:
1. supporting piles; 2. a section steel main beam; 3. a profile steel secondary beam; 4. a grid steel frame; 5. a height adjustment bolt; 6. a crown beam; 7. a protected pipeline; 8. hanging the ribs; 9. a connecting member; 10. leading the small catheter.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The embodiment provides a protection architecture in situ for a foundation pit pipeline at an entrance and an exit of a subway by an open cut method, which comprises a support pile 1, a section steel main beam 2, a section steel secondary beam 3, a grid steel frame 4, a height adjusting bolt 5, a crown beam 6, a protected pipeline 7, a hanging rib 8, a connecting piece 9 and a small advanced guide pipe 10, as shown in fig. 1 to 6. A connecting piece 9 is embedded in the supporting pile 1, and the supporting pile 1 is connected with the section steel main beam 2 and the grid steel frame 4 through the connecting piece 9; the profile steel secondary beam 3 penetrates through the bottom of the protected pipeline 7 and is lapped on the profile steel main beam 2, the height adjusting bolts 5 are arranged on the profile steel main beam 2, and the height of the profile steel secondary beam 3 is adjusted through the height adjusting bolts 5, so that the profile steel secondary beam 3 is tightly attached to the protected pipeline 7, and a pipeline in-situ protection structure is formed.
The supporting pile 1 on the same side of the protected pipeline 7 is reliably connected with the steel main beam 2 through the connecting piece 9, a lifting rib 8 is additionally arranged between the supporting column 1 and the steel main beam 2, one end of the lifting rib 8 is welded with the main rib of the supporting pile 1, and the other end of the lifting rib is welded on the steel main beam 2; the supporting piles 1 on two sides of the protected pipeline 7 are reliably connected with the grid steel frame 4 through the connecting pieces 9. The pile diameter of the supporting pile 1 is larger than that of a general section of fender pile. Connecting pieces 9 are buried in the supporting piles, each connecting piece 9 is composed of an anchor bar and an arc-shaped steel plate, the size of each steel plate is 5-10 cm larger than the width of a wing plate and the height of a web plate of the section steel main beam 2, and the section steel main beam 2 and the connecting pieces 9 can be welded under the condition of construction errors. Still be equipped with one between support column 1 and shaped steel girder 2 and hang muscle 8, hang muscle 8 one end with support pile 1 owner muscle welding, the other end welding is in on the shaped steel girder 2. The length of the profile steel secondary beam 3 is not less than the sum of the pile distance and the pile diameter of the two sides of the protected pipeline 7, and one end, driven into a soil layer, of the profile steel secondary beam 3 is pointed; making it easier to drive into the soil. Four holes are punched in the top wing plate of the section steel main beam 2 at the intersection of the section steel main beam 2 and the section steel secondary beam 3, threads are arranged on the inner wall of each hole, nuts are welded at the bottoms of the holes, and four height adjusting bolts 5 are matched and used for adjusting the height of the section steel secondary beam 3. The supporting piles 1 between the two sides of the pipeline are connected with the grid steel frame 4 through the connecting pieces 9, advanced small guide pipes 10 are arranged for ensuring the safety of foundation pit excavation, and spraying and mixing among the piles are carried out.
In the embodiment, four supporting piles 1 are arranged on a protected pipeline 7 and two sides of a foundation pit and used as a protective pile and a pipeline supporting pile for the foundation pit at an entrance, a connecting piece 9 needs to be pre-embedded in advance in the supporting piles 1, a section steel main beam 2 is reliably connected with the supporting piles through hanging ribs 8 and the connecting pieces 9, a section steel secondary beam 3 is erected on the section steel main beam 2 to support the protected pipeline 7, four holes (the inner wall of each hole is provided with threads) are arranged on a top wing plate of the section steel main beam 2 at the intersection of the section steel secondary beam 3 and the section steel main beam 2, and nuts are; the height of the section steel secondary beam 3 is adjusted by the height adjusting bolt 5 through a nut, so that the section steel secondary beam 3 is tightly attached to a protected pipeline 7 to form a pipeline in-situ protection structure. The grid steel frame 4 and the advanced small guide pipe 10 are used as supporting structures between the supporting piles 1 on two sides of the protected pipeline 7, and the safety of foundation pit excavation is guaranteed.
Specifically, as shown in fig. 4 to 5, the connecting piece 9 is pre-embedded in advance according to the measured elevation of the pipeline when the support pile 1 is used for manufacturing the steel reinforcement cage; punching a top wing plate of the section steel main beam 2 at the intersection position of the section steel main beam 2 and the section steel secondary beam 3 (the inner wall of a hole is provided with threads), and welding a nut at the bottom of the hole.
Further, the supporting piles 1 on one side of the protected pipeline 7 are connected through the steel girder 2. Specifically, as shown in fig. 1 to 4, after the steel girder 2 is excavated in layers to the bottom elevation, the arc-shaped steel plate of the connecting member 9 is chiseled out, the end of the steel girder 2 is welded to the connecting member 9, and the main rib is chiseled out at an appropriate position, so that one end of the suspension rib 8 is welded to the main rib of the support pile 1, and the other end is welded to the steel girder 2.
Further, the profile steel secondary beam 3 penetrates through the bottom of the protected pipeline 7 and is horizontally driven into a soil layer. Specifically, as shown in fig. 1 to 3, a section steel secondary beam 3 is horizontally laid on the top of a section steel main beam 2 close to the excavation side to a designed position.
Further, the supporting pile 1 at the other side of the protected pipeline 7 is connected with the main section steel beam 2, and the secondary section steel beam 3 is lapped on the main section steel beam 2. Specifically, as shown in fig. 1 to 4, after the steel girder 2 is excavated in layers to the bottom elevation, the arc-shaped steel plate of the connecting member 9 is chiseled out, the steel girder 2 is placed under the steel secondary beam 3, the end of the steel girder 2 is welded to the connecting member 9, and the main rib is chiseled out at a proper position, so that one end of the suspension rib 8 is welded to the main rib of the support pile 1, and the other end of the suspension rib is welded to the steel girder 2.
Further, the height of the section steel secondary beam 3 is adjusted through the height adjusting bolt 5, so that the section steel secondary beam 3 is tightly attached to a protected pipeline 7 to form a pipeline in-situ protection structure. Specifically, as shown in fig. 5, according to the construction reserved space and the construction error, the height adjusting bolt 5 is tightened, and the section steel secondary beam 3 is jacked up to be closely attached to the protected pipeline 7 as the height adjusting bolt 5 continuously moves upward.
Further, the supporting piles 1 at two sides of the protected pipeline 7 are connected with the grid steel frame 4. Specifically, as shown in fig. 1 to 4 and 6, after the foundation pit is excavated to a certain depth, the arc-shaped steel plate of the connecting member 9 is chiseled out, the end of the grid steel frame 4 is welded to the connecting member 9, and the pilot small pipe 10 is arranged to perform the inter-pile spraying.
The embodiment also provides a construction method for the open cut method subway entrance and exit foundation pit pipeline in-situ protection structure, which comprises the following steps:
firstly, driving four supporting piles 1 on a protected pipeline 7 and two sides of a foundation pit;
constructing a crown beam 6 and a first enclosure support, and then excavating a foundation pit to reach the bottom elevation of a pipeline 7;
excavating a soil layer on one side of the protected pipeline 7 to the bottom elevation of the steel girder 2;
chiseling concrete at the positions of two support piles 1 on the excavation side and the position of a hanging rib 8, welding the section steel main beam 2 with a connecting piece 9, welding one end of the hanging rib 8 with a main rib of the support pile 1, and welding the other end of the hanging rib on the section steel main beam 2;
horizontally driving a profile steel secondary beam 3 into the top surface of the excavation side-attached profile steel main beam 2 to a designed position;
excavating a soil layer on the other side of the protected pipeline 7 to the bottom elevation of the main section steel beam 2, and constructing the main section steel beam 2 on the side in the fourth synchronous step, so that the secondary section steel beam 3 is lapped on the main section steel beam 2;
seventhly, height adjustment is carried out on the profile steel secondary beam 3 through a height adjusting bolt 5 fixed on the profile steel main beam 2 according to the construction reserved space and the construction error, so that the profile steel secondary beam 3 is tightly attached to the bottom of the protected pipeline 7, and a pipeline deformation space is not reserved;
step eight, excavating and constructing a soil layer at the position of the protected pipeline 7 in a layered mode, chiseling concrete at the position of the grid steel frame 4 between the support piles 1 at two sides of the protected pipeline 7, leaking out the connecting piece 9, and welding the grid steel frame 4 and the connecting piece 9; then, the advanced small guide pipe 10 is arranged, and the downward layered excavation is continued after the spraying and mixing among the piles.
Further, in step three and step six: when soil layers on two sides of the protected pipeline 7 are excavated, a manual excavation mode is adopted, the soil layer at the bottom of the protected pipeline 7 is guaranteed not to be disturbed as much as possible, and the protected pipeline 7 is prevented from deforming.
Further, in step four and step eight: the steel section main beam 2, the grid steel frame 4, the connecting piece 9 and the hanging ribs 8 are welded by double-sided welding, the welding quality is guaranteed, and reliable connection is formed among the steel section main beam, the grid steel frame 4, the connecting piece 9 and the hanging ribs.
Further, in step five: when the section steel secondary beam 3 is arranged, the construction precision is strictly controlled, and the elevation deviation is controlled within +/-10 mm.
Further, in step seven: the construction steel girder 2 can suitably wholly move down a certain distance when being under construction, does not harm protected pipeline 7 when guaranteeing to beat and establish shaped steel secondary beam 3, washes protected pipeline 7 and shaped steel secondary beam 3 contact surface department debris with the high-pressure squirt before carrying out altitude mixture control.
According to the technical scheme, the pipeline in-situ protection structure and the construction method for the foundation pit at the subway entrance/exit by the open cut method provided by the embodiment of the invention have the advantages that the pipeline is prevented from being changed, the construction period is effectively shortened, the engineering cost is saved, the problem of overlarge space between the fender posts at two sides of the pipeline is solved, the safety of the foundation pit is ensured, and the pipeline in-situ protection structure and the construction method have high popularization value.
The embodiments of the present invention have been described in detail through the embodiments, but the description is only exemplary of the embodiments of the present invention and should not be construed as limiting the scope of the embodiments of the present invention. The scope of protection of the embodiments of the invention is defined by the claims. In the present invention, the technical solutions described in the embodiments of the present invention or those skilled in the art, based on the teachings of the embodiments of the present invention, design similar technical solutions to achieve the above technical effects within the spirit and the protection scope of the embodiments of the present invention, or equivalent changes and modifications made to the application scope, etc., should still fall within the protection scope covered by the patent of the embodiments of the present invention.
Claims (12)
1. The in-situ protection structure for the foundation pit pipeline at the subway entrance and exit by the open cut method is characterized by comprising support piles (1), a section steel main beam (2), a section steel secondary beam (3), a grid steel frame (4) and height adjusting bolts (5), wherein connecting pieces (9) are pre-buried in the support piles (1), and the support piles (1) are connected with the section steel main beam (2) and the grid steel frame (4) through the connecting pieces (9); the structural steel secondary beam (3) penetrates through the bottom of a protected pipeline (7) and is lapped on the structural steel main beam (2), the height adjusting bolts (5) are arranged on the structural steel main beam (2), and the height of the structural steel secondary beam (3) is adjusted through the height adjusting bolts (5), so that the structural steel secondary beam (3) is tightly attached to the protected pipeline (7).
2. The in-situ protection structure for the foundation pit pipeline of the open-cut subway entrance/exit according to claim 1, wherein the supporting pile (1) on the same side of the protected pipeline (7) is connected with the main section steel beam (2) through the connecting piece (9), a hanging rib (8) is arranged between the supporting pile (1) and the main section steel beam (2), one end of the hanging rib (8) is welded with the main rib of the supporting pile (1), and the other end of the hanging rib is welded on the main section steel beam (2); the supporting piles (1) on two sides of the protected pipeline (7) are connected with the grid steel frame (4) through the connecting pieces (9).
3. The in-situ protection structure for the foundation pit pipeline at the entrance and exit of an open-cut subway according to claim 1, wherein the pile diameter of the supporting pile (1) is larger than that of a general-section fender pile.
4. The in-situ protection structure for the foundation pit pipeline at the entrance and exit of the open-cut subway according to claim 1, wherein a connecting piece (9) is buried in the supporting pile (1), the connecting piece (9) is composed of an anchor bar and an arc-shaped steel plate, and the size of the steel plate is 5-10 cm larger than the width of a wing plate and the height of a web plate of the main steel beam (2).
5. The in-situ protection structure for the foundation pit pipeline at the entrance and the exit of the open-cut subway according to claim 1, wherein the length of the profile steel secondary beam (3) is not less than the sum of the pile distance and the pile diameter on two sides of the protected pipeline (7); one end of the profile steel secondary beam (3) driven into the soil layer is pointed.
6. The in-situ protection structure for the foundation pit pipeline at the entrance and exit of an open-cut subway according to claim 1, wherein four holes are drilled on the top wing plate of the main section steel beam (2) at the intersection of the main section steel beam (2) and the secondary section steel beam (3), the inner wall of each hole is provided with threads, and nuts are welded on the bottom of each hole to match with the four height adjusting bolts (5).
7. The in-situ protection structure for the foundation pit pipeline at the entrance and exit of the open-cut subway according to claim 1, wherein the supporting piles (1) between two sides of the pipeline are connected with the grid steel frame (4) through the connecting pieces (9), and the leading small guide pipes (10) are arranged for ensuring the safety of foundation pit excavation and are sprayed and mixed among piles.
8. A construction method for an open cut method subway entrance and exit foundation pit pipeline in-situ protection structure is characterized by comprising the following steps:
firstly, driving four supporting piles (1) on a protected pipeline (7) and two sides of a foundation pit;
constructing a crown beam (6) and a first enclosure support, and then excavating a foundation pit to reach the bottom elevation of the protected pipeline (7);
excavating a soil layer on one side of the protected pipeline (7) to the bottom elevation of the section steel main beam (2);
chiseling concrete at the positions of two main beams of the support piles (1) at the excavation side and the positions of the hanging ribs (8), welding the section steel main beam (2) with the connecting piece (9), welding one end of each hanging rib (8) with the main rib of the support pile (1), and welding the other end of each hanging rib on the section steel main beam (2);
horizontally driving a profile steel secondary beam (3) into the top surface of the excavation side-attached profile steel main beam (2) to a designed position;
excavating a soil layer on the other side of the protected pipeline (7) to the bottom elevation of the main section steel beam (2), and constructing the main section steel beam (2) on the side in the fourth synchronous step, so that the secondary section steel beam (3) is lapped on the main section steel beam (2);
seventhly, height adjustment is carried out on the profile steel secondary beam (3) through a height adjusting bolt (5) fixed on the profile steel main beam (2) according to the construction reserved space and construction errors, so that the profile steel secondary beam (3) is tightly attached to the bottom of the protected pipeline (7), and no pipeline deformation space is reserved;
step eight, excavating soil layers at the positions of construction pipelines in a layered mode, chiseling concrete at the positions of grid steel frames (4) between supporting piles (1) on two sides of a protected pipeline (7), leaking out connecting pieces (9), and welding the grid steel frames (4) and the connecting pieces (9); then, an advanced small guide pipe (10) is arranged, and the downward layered excavation is continued after the spraying and mixing among the piles.
9. The construction method for the open-cut method subway entrance/exit foundation pit pipeline in-situ protection structure according to claim 8, wherein in the third step and the sixth step: and when soil layers on two sides of the protected pipeline (7) are excavated, a manual excavation mode is adopted, so that the soil layer at the bottom of the protected pipeline (7) is ensured not to be disturbed as much as possible, and the protected pipeline (7) is prevented from deforming.
10. The construction method for the open-cut method subway entrance/exit foundation pit pipeline in-situ protection structure according to claim 8, wherein in the fourth step and the eighth step: the steel section main beam (2), the grid steel frame (4), the connecting piece (9) and the hanging rib (8) are welded by adopting double-sided welding, and the welding quality is ensured, so that reliable connection is formed between the steel section main beam and the grid steel frame.
11. The construction method for the open-cut method subway entrance/exit foundation pit pipeline in-situ protection structure as claimed in claim 8, wherein in step five: when the profile steel secondary beam (3) is arranged, the construction precision is strictly controlled, and the elevation deviation is controlled within +/-10 mm.
12. The construction method for the open-cut method subway entrance/exit foundation pit pipeline in-situ protection structure according to claim 8, wherein in the seventh step: when the profile steel main beam (2) is constructed, the profile steel main beam can be properly and integrally moved down for a certain distance, the protected pipeline (7) is not damaged when the profile steel secondary beam (3) is arranged, and sundries on the contact surface between the protected pipeline (7) and the profile steel secondary beam (3) are washed by a high-pressure water gun before height adjustment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110115305.7A CN112796329A (en) | 2021-01-26 | 2021-01-26 | In-situ protection structure for foundation pit pipeline at subway entrance and exit by open cut method and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110115305.7A CN112796329A (en) | 2021-01-26 | 2021-01-26 | In-situ protection structure for foundation pit pipeline at subway entrance and exit by open cut method and construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112796329A true CN112796329A (en) | 2021-05-14 |
Family
ID=75812425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110115305.7A Pending CN112796329A (en) | 2021-01-26 | 2021-01-26 | In-situ protection structure for foundation pit pipeline at subway entrance and exit by open cut method and construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112796329A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115492216A (en) * | 2022-09-30 | 2022-12-20 | 中铁八局集团电务工程有限公司 | Supporting device for transferring pipeline to upper part of underground station and construction method |
-
2021
- 2021-01-26 CN CN202110115305.7A patent/CN112796329A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115492216A (en) * | 2022-09-30 | 2022-12-20 | 中铁八局集团电务工程有限公司 | Supporting device for transferring pipeline to upper part of underground station and construction method |
| CN115492216B (en) * | 2022-09-30 | 2023-07-04 | 中铁八局集团电务工程有限公司 | Supporting device for pipeline to be moved to above underground station and construction method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108678751B (en) | Assembly type construction method of shield cutter head manhole by jacking and excavating firstly | |
| CN111236241B (en) | Weak water-rich stratum subway foundation pit reinforcing excavation method based on half-cover excavation method | |
| CN113266392B (en) | Pipe jacking construction method for penetrating through existing anchor cable group | |
| CN110985042A (en) | Urban comprehensive pipe gallery and underground shallow-buried underground tunnel combined supporting system and process | |
| CN114412509A (en) | Support method suitable for large deformation of mudstone tunnel | |
| CN112796329A (en) | In-situ protection structure for foundation pit pipeline at subway entrance and exit by open cut method and construction method | |
| CN106088758A (en) | A kind of double-deck assembled underground granary | |
| CN216339582U (en) | Combined inclined support for foundation pit support | |
| CN214783995U (en) | Composite steel pipe column foundation pit supporting system based on rapid construction | |
| CN213836666U (en) | Precast concrete non-primary support system with lattice columns for foundation pit engineering | |
| CN214832720U (en) | In-situ protection structure for foundation pit pipeline at subway entrance and exit by open cut method | |
| CN106088762A (en) | The prefabricated assembled circular underground granary of a kind of insertion slot type encased steel plate | |
| CN106013911A (en) | Internal steel plate assembly type circular underground granary with prefabricated caulking strips | |
| CN106088759B (en) | The equal stepped prefabricated assembled circular underground granary of steel plated inside and outside one kind | |
| CN217580213U (en) | Cantilever construction platform for anchor cable support | |
| CN113338990B (en) | Prestress binding structure for continuous large-span underground space and construction method | |
| CN111379576B (en) | Method for connecting primary support and large-diameter pipe shed in shed cover construction | |
| CN216198134U (en) | Waterproof novel subway station is led to full row of half package | |
| CN211500660U (en) | Urban comprehensive pipe gallery and underground shallow buried underground excavation tunnel combined supporting system | |
| CN218952197U (en) | Foundation pit concrete support and steel upright post connection structure | |
| CN211257025U (en) | Steel sheet pile cofferdam with slip casting platform | |
| CN212270961U (en) | Deep foundation pit supporting structure under ultra-wide pipeline | |
| CN110565667B (en) | Steel sheet pile cofferdam with grouting platform | |
| CN106088764A (en) | The stepped prefabricated assembled circular underground granary of a kind of encased steel plate | |
| CN108643917B (en) | Semi-backfill type shield cutter head maintenance well assembly type construction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |