CN108343066B - Subway transfer station tie line pit in pit supporting structure and excavation method - Google Patents
Subway transfer station tie line pit in pit supporting structure and excavation method Download PDFInfo
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- CN108343066B CN108343066B CN201810371737.2A CN201810371737A CN108343066B CN 108343066 B CN108343066 B CN 108343066B CN 201810371737 A CN201810371737 A CN 201810371737A CN 108343066 B CN108343066 B CN 108343066B
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- bottom plate
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- pit
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 45
- 238000010276 construction Methods 0.000 claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 239000004567 concrete Substances 0.000 claims description 13
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 9
- 239000002689 soil Substances 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
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- 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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- 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)
- Sustainable Development (AREA)
- Environmental & Geological Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention provides a pit-in-pit supporting structure of a tie line of a subway transfer station and an excavation method, wherein the supporting structure comprises supporting rods, reinforced concrete brackets and a main structure bottom plate, the main structure bottom plate comprises a poured structure bottom plate and a post-poured structure bottom plate, the reinforced concrete brackets are poured above the end part of the poured main structure bottom plate at intervals along the direction of the tie line, one end of each supporting rod is supported on a foundation pit enclosure structure, and the other end of each supporting rod is supported on the reinforced concrete bracket, so that the problems that the deformation of the pit wall exceeds standard at present, temporary reinforcement measures are adopted before excavation of the tie line foundation pit, the construction requirement is high, the cost investment is large, the environment protection is not facilitated and the like are solved. Belongs to the field of subway construction.
Description
Technical Field
The invention relates to a subway transfer station tie line pit-in-pit supporting structure and an excavation method, and belongs to the field of subway construction.
Background
The construction of the connecting lines is generally carried out after the construction of the main body structure of the station is completed, and the construction is organized according to the sequence, so that the construction safety risks of the main body foundation pit and the connecting line foundation pit of the station are reduced to a certain extent, but the construction of the connecting lines is carried out by additionally maintaining the structure, the construction cost is greatly increased, and the construction period is longer. The Hangzhou subway SG5-9 standard Shen Banlu station is designed into 3, 5 wire transfer stations, the stations are arranged in an inverted T shape, the 3 wire stations are arranged in the north-south direction along the half-way of the ground, the 5 wire stations are arranged in the east-west direction across Shen Banlu and are of an underground two-layer structure. 3. A tie line is arranged between stations of the No. 5 wire, the height difference of the tie line is 4.91m (-13.050 m to-17.960 m), and the longitudinal slope is 38.272 per mill. The station foundation pit excavation is constructed in a mode of excavating a main foundation pit and a tie line foundation pit simultaneously. The station tie line is designed to be a concave curve trend, and the side pressure of the earth on the pit wall is very large in the pit wall excavation construction of the tie line through design checking calculation, so that the deformation of the pit wall exceeds the standard, temporary reinforcement measures are needed before the tie line pit excavation, and the safety of the pit excavation is ensured. Usually, the pit-in-pit support adopts the modes of drilling and grouting row piles, cement soil stirring piles, high-pressure jet grouting piles, gravity retaining walls and the like, but the mode has high construction requirements, large cost investment and is not beneficial to environmental protection.
Disclosure of Invention
The invention aims at: the utility model provides a subway transfer station tie line pit in pit bearing structure and excavation method to solve at present and surpass standard in pit wall deflection, the interim reinforcement measure that takes before the tie line foundation ditch excavation, construction requirement is high, and the cost is invested in greatly, is unfavorable for environmental protection scheduling problem.
In order to solve the problems, the method for excavating the pits in the tie-line pits of the subway transfer station is to be adopted, and comprises the following specific steps:
step one: excavating to the bottom of a main body foundation pit, completing pouring of a main body structure bottom plate in the main body foundation pit range, reserving a section of width as a post-pouring strip on the side line of a distance connecting line structure during pouring, reserving a steel bar joint at the end part, and reserving the post-pouring strip width as follows: the excavation depth of the foundation pit of the connecting line is +1.5m;
step two: pouring reinforced concrete brackets at intervals along the direction of the connecting lines on the top of the end part of the bottom plate of the poured main body structure, wherein the distance between the brackets is the same as the distance between temporary support rods, and the foundation pit excavation can be ensured to be smoothly carried out by the mechanical energy in the later stage;
step three: after the strength of the structural bottom plate and the reinforced concrete bracket reaches 85% of the design strength, installing a support rod piece, wherein one end of the support rod piece is supported on the foundation pit enclosure structure, the other end of the support rod piece is supported on the reinforced concrete bracket, and the support rod piece, the reinforced concrete bracket and the poured structural bottom plate are connected into a whole to be used as a horizontal support structure for bearing the soil pressure at two sides of the foundation pit;
step four: excavating a tie line foundation pit, wherein the foundation pit slope is formed by the following steps of 1:1, slope laying and excavating, wherein a platform with the distance of more than or equal to 1.5m is reserved between poured bottom plates on the excavation edge;
step five: applying a main structure of the connecting line, and filling the main structure of the connecting line between slopes by adopting C20 plain concrete until the bottom elevation of a main foundation pit is filled after the main structure of the connecting line reaches 85% of the design strength;
step six: applying a post-cast strip of the bottom plate of the main body structure, and curing, wherein the post-cast strip steel bars are effectively connected with reserved steel bars according to the design specification;
step seven: and after the concrete strength reaches 85% of the design requirement, dismantling the tie line foundation pit support and the reinforced concrete bracket, and then carrying out subsequent main body structural engineering construction.
In the second step, the reinforced concrete brackets are alternately arranged according to the intervals of 2m and 4m, and connecting steel bars are reserved at the reinforced concrete brackets when the main body structure bottom plate is manufactured, so that the reinforced concrete brackets and the structure bottom plate form a whole, and the stress stability is ensured;
and step four, excavating the foundation pit in layers, hanging 6.5@250×250 reinforcing steel meshes on the slope every time when one layer is excavated, and spraying 10cm thick C15 plain spray concrete as slope protection.
The invention also provides a subway transfer station tie line pit in pit supporting structure which comprises a supporting rod piece, reinforced concrete brackets and a main body structure bottom plate, wherein the main body structure bottom plate comprises a poured structure bottom plate and a rear pouring structure bottom plate, the reinforced concrete brackets are poured above the end part of the poured main body structure bottom plate at intervals along the tie line direction, one end of the supporting rod piece is supported on a foundation pit enclosure structure, and the other end of the supporting rod piece is supported on the reinforced concrete brackets.
In the supporting structure, the reinforced concrete brackets are alternately arranged along the direction of the connecting line at intervals of 2m and 4 m;
the end face of the support rod piece is vertical to the side wall of the support bracket and tightly clung to the side wall of the support bracket, so that the support rod piece is ensured to be uniformly stressed; the reinforced concrete bracket is arranged on the top surface of the end part of the bottom plate of the main body structure, and the reinforced concrete bracket and the bracket are effectively connected into a whole through the reserved reinforcing steel bars of the bottom plate during construction; the support rod piece is generally a steel pipe and can also be a reinforced concrete support rod piece; the reinforced concrete bracket is generally of a cuboid structure, and the length, width and height are 1m, 1.2m; when the tie line foundation pit is excavated, the horizontal support stress system formed by the support rod pieces, the reinforced concrete brackets and the main structure bottom plate is utilized to bear the soil pressure at two sides of the pit wall, so that the safety of the foundation pit excavation is ensured.
Compared with the prior art, the invention has the following advantages:
1. the supporting structure of the pit in the tie line pit is formed by the supporting rod pieces, the reinforced concrete bracket and the main structure bottom plate, the supporting structure is definite in stress, simple in structure, low in construction requirement and low in cost investment, and is beneficial to environmental protection;
2. the horizontal supporting structure fully utilizes the poured structural bottom plate to offset the pressure of the two side walls, so that the investment of materials is reduced, and the cost is reduced;
3. compared with the conventional supporting mode, the supporting structure is small in construction difficulty and easy to control in construction quality.
Drawings
FIG. 1 is a schematic top view of a station Shen Banlu to SG5-9 in Hangzhou subway according to an embodiment of the present invention;
FIG. 2 is a partial enlarged view at B in FIG. 1
FIG. 3 is a cross-sectional view at A-A in FIG. 2;
the concrete filling machine comprises a reference numeral 1-support rod piece, 2-reinforced concrete bracket, 3-main structure bottom plate, 31-poured structure bottom plate, 32-post-poured structure bottom plate, 4-foundation pit enclosure structure (underground continuous wall), 5-connecting line structure, 6-10cm thick C15 plain concrete, 6.5@250X250 reinforcing steel mesh and 7-plain concrete filling. 8-station main body structure, 9-station No. 5 wire underground two-layer structure, 10-station No. 3 wire underground three-layer structure, 11-tie line structure side line and 12-tie line center line.
Detailed Description
For the purpose of promoting an understanding of the principles of the invention, reference will now be made in detail to the embodiments described herein, including examples, illustrated in the accompanying drawings.
Examples
As shown in fig. 1, taking a station Shen Banlu of a hangzhou subway SG5-9 as an example, the station is designed into a transfer station with 3 and 5 lines, the 5 line of the station is of an underground two-layer structure, the 3 line of the station is of an underground three-layer structure, connecting lines are connected with the 3 line along the 5 line of the station in a transitional manner, the height difference of the connecting lines is 4.91m (-13.050 m to-17.960 m), and the longitudinal slope is 38.272 permillage.
As shown in fig. 2 and 3, the present embodiment provides a pit-in-pit supporting structure in a tie line pit of a subway transfer station, which is a combined structure including a supporting rod 1, a reinforced concrete bracket 2 and a main structure bottom plate 3, the main structure bottom plate 3 including a poured structure bottom plate 31 and a post-poured structure bottom plate 32. One end of a support rod piece 1 is supported on the side wall of the underground diaphragm wall of the foundation pit, the other end of the support rod piece is supported on the side wall of a reinforced concrete bracket 2, and the end face of the support rod piece 1 is mixed with reinforcing steel barsThe side wall of the concrete bracket 2 is in a vertical state and is tightly connected and tightly compacted, so that the uniform stress of the support rod piece 1 is ensured; the reinforced concrete bracket 2 is arranged on the top surface of the end part of the poured structure bottom plate 31, and steel bars are reserved on the top surface of the poured structure bottom plate 31 during construction so as to be effectively connected with the reinforced concrete bracket 2; the support rod 1 isA steel pipe; the reinforced concrete bracket 2 is of a cuboid structure, and the length, width and height are 1m, 1.2m; when the tie line foundation pit is excavated, a horizontal supporting stress system is formed by the supporting rod pieces 1, the reinforced concrete brackets 2 and the poured structural bottom plate 31 to bear the pressure on two sides of the pit wall, so that the safety of the foundation pit excavation is ensured.
The construction method comprises the following steps:
step 1: excavating to the bottom elevation of the main body foundation pit, rapidly completing pouring of a main body structure bottom plate in the main body foundation pit range, reserving a width as a post-pouring strip on the edge line of the distance connecting line structure during pouring, and reserving reinforcing steel bars at the positions of reinforced concrete brackets at the ends of the poured structure bottom plate. The width of the reserved post-pouring band is as follows: the excavation depth of the connecting line foundation pit is +1.5m.
Step 2: as shown in fig. 1, reinforced concrete brackets are arranged on the top surface of the end part of the bottom plate of the poured main body structure at intervals along the direction of the connecting line. The length, width and height of the reinforced concrete bracket are respectively 1m multiplied by 1.2m, the distance between each bracket is the same as the distance between temporary supporting rods, and the later mechanical energy is ensured to be smoothly excavated. Alternately arranged at intervals of 2m and 4 m. When the cast structure bottom plate is manufactured, the steel bars are reserved at the arrangement positions of the reinforced concrete brackets, so that the reinforced concrete bracket steel bars and the cast structure bottom plate steel bars are effectively connected to form a whole, and the stress stability is ensured.
Step 3: after the strength of the poured structural bottom plate and the reinforced concrete bracket reaches 85% of the design strength, installing a support rod piece, wherein the support rod piece isOne end of the supporting rod piece is supported on the side wall of the foundation pit underground diaphragm wallThe other end is supported on the side wall of the reinforced concrete bracket, and the support rod piece, the reinforced concrete bracket and the poured structure bottom plate are connected into a whole to be used as a horizontal support structure for bearing the pressure on two sides of the foundation pit.
Step 4: excavating a tie line foundation pit, wherein the foundation pit slope is formed by the following steps of 1:1, slope laying and excavating, wherein a platform with the excavation edge distance of not less than 1.5m is reserved between the bottom plates of the poured structure. The foundation pit is excavated in layers, each layer is excavated, 6.5@250X250 reinforcing steel meshes are hung on the slope, and 10cm thick C15 plain concrete is sprayed to serve as temporary protection of the slope.
Step 5: and (3) constructing a connecting line structure, and filling a triangular area between the connecting line structure and the side slope by adopting C20 plain concrete after the strength of the connecting line structure reaches 85% of the design strength, and filling the triangular area to the elevation of the bottom plate of the post-pouring structure.
Step six: and after the construction, pouring the structural bottom plate, maintaining, and effectively connecting the reinforcing steel bars of the structural bottom plate with the reserved reinforcing steel bars at the end parts of the poured structural bottom plate according to the design specification.
Step seven: and after the strength of the concrete reaches 85% of the design requirement, dismantling the tie line foundation pit support and the reinforced concrete bracket. And then carrying out subsequent main body structure engineering construction.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (3)
1. The method for excavating the middle pit of the tie line pit of the subway transfer station is characterized by comprising the following steps of:
step one: excavating to the bottom of a main body foundation pit, completing pouring of a main body structure bottom plate in the main body foundation pit range, reserving a section of width as a post-pouring strip on the side line of a distance connecting line structure during pouring, reserving a steel bar joint at the end part, and reserving the post-pouring strip width as follows: the excavation depth of the foundation pit of the connecting line is +1.5m;
step two: pouring reinforced concrete brackets at intervals along the direction of the connecting lines on the top of the end part of the bottom plate of the poured main body structure, wherein the distance between the brackets is the same as the distance between temporary support rods, and the foundation pit excavation can be ensured to be smoothly carried out by the mechanical energy in the later stage;
step three: after the strength of the structural bottom plate and the reinforced concrete bracket reaches 85% of the design strength, installing a support rod piece, wherein one end of the support rod piece is supported on the foundation pit enclosure structure, the other end of the support rod piece is supported on the reinforced concrete bracket, and the support rod piece, the reinforced concrete bracket and the poured structural bottom plate are connected into a whole to be used as a horizontal support structure for bearing the soil pressure at two sides of the foundation pit;
step four: excavating a tie line foundation pit, wherein the foundation pit slope is formed by the following steps of 1:1, slope laying and excavating, wherein a platform with the distance of more than or equal to 1.5m is reserved between poured bottom plates on the excavation edge;
step five: applying a main structure of the connecting line, and filling the main structure of the connecting line between slopes by adopting C20 plain concrete until the bottom elevation of a main foundation pit is filled after the main structure of the connecting line reaches 85% of the design strength;
step six: applying a post-cast strip of the bottom plate of the main body structure, and curing, wherein the post-cast strip steel bars are effectively connected with reserved steel bars according to the design specification;
step seven: and after the concrete strength reaches 85% of the design requirement, dismantling the tie line foundation pit support and the reinforced concrete bracket, and then carrying out subsequent main body structural engineering construction.
2. The method according to claim 1, wherein: in the second step, the reinforced concrete brackets are alternately arranged according to the intervals of 2m and 4m, and connecting steel bars are reserved at the reinforced concrete brackets when the main body structure bottom plate is manufactured, so that the reinforced concrete brackets and the structure bottom plate form a whole.
3. The method according to claim 1, wherein: and step four, excavating the foundation pit in layers, hanging 6.5@250×250 reinforcing steel meshes on the slope every time when one layer is excavated, and spraying 10cm thick C15 plain spray concrete as slope protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810371737.2A CN108343066B (en) | 2018-04-24 | 2018-04-24 | Subway transfer station tie line pit in pit supporting structure and excavation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810371737.2A CN108343066B (en) | 2018-04-24 | 2018-04-24 | Subway transfer station tie line pit in pit supporting structure and excavation method |
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| CN108343066A CN108343066A (en) | 2018-07-31 |
| CN108343066B true CN108343066B (en) | 2023-11-17 |
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| CN103410153A (en) * | 2013-08-30 | 2013-11-27 | 南通八建集团有限公司 | Adjacent deep foundation trench and shallow foundation trench synchronous construction method |
| CN103628503A (en) * | 2013-11-27 | 2014-03-12 | 中铁第四勘察设计院集团有限公司 | Construction method for using underground second-layer station enclosure to make underground third-layer transfer joint |
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| CN209412830U (en) * | 2018-04-24 | 2019-09-20 | 中铁二局第一工程有限公司 | A kind of subway transfer station interconnection cheats support construction in hole |
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2018
- 2018-04-24 CN CN201810371737.2A patent/CN108343066B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410153A (en) * | 2013-08-30 | 2013-11-27 | 南通八建集团有限公司 | Adjacent deep foundation trench and shallow foundation trench synchronous construction method |
| CN103628503A (en) * | 2013-11-27 | 2014-03-12 | 中铁第四勘察设计院集团有限公司 | Construction method for using underground second-layer station enclosure to make underground third-layer transfer joint |
| CN104947677A (en) * | 2014-03-28 | 2015-09-30 | 中国二十冶集团有限公司 | Rapid cofferdam filling construction method for pit in pit |
| CN209412830U (en) * | 2018-04-24 | 2019-09-20 | 中铁二局第一工程有限公司 | A kind of subway transfer station interconnection cheats support construction in hole |
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| Title |
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