CN115852868A - Urban rainwater box culvert expansion construction method - Google Patents
Urban rainwater box culvert expansion construction method Download PDFInfo
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- CN115852868A CN115852868A CN202310099080.XA CN202310099080A CN115852868A CN 115852868 A CN115852868 A CN 115852868A CN 202310099080 A CN202310099080 A CN 202310099080A CN 115852868 A CN115852868 A CN 115852868A
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- box culvert
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- 238000010276 construction Methods 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 239000004576 sand Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a city rainwater box culvert capacity expansion construction method, which is characterized in that a new box culvert is expanded on one side of an old box culvert, a foundation pit cross brace is arranged on the side wall of the old box culvert, and a guide brace is arranged in the old box culvert to keep the side wall of the old box culvert balanced in stress; in the construction process of the newly-built box culvert, an enlarged blade foot is poured between a bottom plate of the newly-built box culvert and a foundation pit support steel plate pile, coarse sand is backfilled between a side plate of the newly-built box culvert and the steel plate pile, and the stability of a foundation pit support system after the cross brace is removed is ensured. The invention has low construction cost and little influence on underground pipelines, can avoid the damage of the old box culvert and ensure the construction safety.
Description
Technical Field
The invention belongs to the field of municipal water supply and drainage construction, and particularly relates to an expansion construction method for an urban rainwater box culvert.
Background
Along with the rapid development of urbanization, many early-planned underground rainwater box culverts can not meet the urban drainage needs, so that urban waterlogging frequently occurs, and expansion transformation of the underground rainwater box culverts is urgently needed. The conventional capacity expansion method is to abandon the original box culvert and rebuild a box culvert with larger capacity, but the investment is huge, and the urban road underground pipelines are complicated and complicated, the existing underground pipelines are migrated during construction, and the dragging range is extremely wide. The other method is to keep the original box culvert and expand a new box culvert on one side of the old box culvert, the method is low in cost, but steel plate piles can only be inserted into one side of the foundation pit during foundation pit construction, the old box culvert is arranged on the other side of the foundation pit, and cross braces need to be supported on the side walls of the old box culvert when foundation pit supports are arranged, so that the structure of the old box culvert is easily damaged.
Disclosure of Invention
The invention aims to solve the problems and provides an urban rainwater box culvert expansion construction method, which adopts the idea of keeping the existing box culvert and expanding a new box culvert so as to reduce the construction investment, avoid damaging the old box culvert and ensure the construction safety.
The technical scheme of the invention is as follows:
an urban rainwater box culvert capacity expansion construction method is characterized by comprising the following steps:
(1) Inserting and driving steel sheet piles at a certain distance from one side of the old box culvert extension according to the box culvert extension plan and scale;
(2) Excavating a foundation pit between the steel sheet pile and the side wall of the old box culvert, and when excavating to a position below the top plate of the old box culvert, arranging a first layer of cross braces between the steel sheet pile and the old box culvert, wherein one end of each first layer of cross brace is supported on the steel sheet pile, and the other end of each first layer of cross brace is supported at the intersection of the side wall of the old box culvert and the top plate along the cross section direction of the top plate of the old box culvert;
(3) Continuously excavating the foundation pit downwards to a position below the waist of the old box culvert, arranging a second layer of cross braces between the steel sheet pile and the old box culvert, wherein one end of each second layer of cross brace is supported on the steel sheet pile, the other end of each second layer of cross brace is supported on a side plate of the old box culvert, meanwhile, a guide brace is arranged in the old box culvert, two ends of each guide brace are respectively supported between two side walls of the old box culvert, and the axes of the guide brace and the second layer of cross braces are on the same straight line; then, continuously excavating the foundation pit to the bottom elevation;
(4) Pouring a newly-built box culvert bottom plate, pouring a newly-built box culvert expanding blade foot between the newly-built box culvert bottom plate and the steel sheet pile, removing a second layer of cross braces and guide braces after the concrete reaches the design strength, and replacing the second layer of cross braces to tightly prop the steel sheet pile through the newly-built box culvert expanding blade foot; the second layer of transverse braces and the guide braces must be removed synchronously, so that damage caused by unbalanced stress of the side plates of the old box culvert is avoided;
(5) Pouring the newly-built box culvert side plates; after the newly-built box culvert side plate concrete reaches the design strength, backfilling coarse sand between the newly-built box culvert side plate and the steel sheet pile to tightly prop the steel sheet pile;
(6) Removing the first layer of cross braces; pouring a top plate of the newly-built box culvert to complete the construction of the newly-built box culvert;
(7) And (5) pulling out the steel sheet pile, backfilling the foundation pit to be level to the original ground, and completing the capacity expansion construction of the box culvert.
The invention has the following advantages:
the existing box culvert does not need to be destroyed and rebuilt, so that a large amount of construction investment can be saved;
large-area foundation pit excavation is not needed, and the influence range on the underground pipeline can be reduced;
in the construction process, the old box culvert is used for arranging the supports, and the guide supports are arranged in the old box culvert to keep the stress balance of the side walls of the old box culvert, so that the integral stability of the foundation pit support can be effectively ensured, and the old box culvert is prevented from being damaged;
and a newly-built box culvert is arranged to enlarge the blade foot, so that the stability and the construction safety of the foundation pit supporting system after the second-layer cross brace is removed are ensured.
Drawings
FIG. 1 is a flow chart of the construction of the present invention;
FIG. 2 is a schematic view of a steel sheet pile after being driven;
FIG. 3 is a schematic view of the arrangement state of a first-layer cross brace of a foundation pit;
fig. 4 is a schematic view of the arrangement state of a second-layer cross brace and a guide brace of the foundation pit;
FIG. 5 is a schematic view of a newly-built box culvert bottom plate and an enlarged blade foot after pouring is completed;
FIG. 6 is a schematic view of a newly-built box culvert after side plate pouring is completed;
FIG. 7 is a schematic diagram of a newly-built box culvert after the top plate is completely poured;
fig. 8 is a schematic diagram of the backfilled foundation pit.
Detailed Description
FIG. 1 is a construction flow chart of the present invention, and the specific construction method is as follows:
(1) As shown in fig. 2, according to the box culvert extension plan and scale, excavating a foundation pit until an old box culvert top plate is exposed, and inserting and driving a steel sheet pile 1 at a certain distance from one side of the old box culvert extension;
(2) As shown in fig. 3, a foundation pit is excavated between a steel sheet pile 1 and the side wall of an old box culvert 2, and when the foundation pit is excavated below the top plate of the old box culvert, a first layer of cross braces 3 is arranged between the steel sheet pile and the old box culvert, one end of each first layer of cross brace 3 is supported on the steel sheet pile 1, and the other end of each first layer of cross brace is supported at the intersection of the side wall of the old box culvert and the top plate along the cross section direction of the top plate of the old box culvert 2;
(3) As shown in fig. 4, the foundation pit is continuously excavated downwards until the lower part of the waist of the old box culvert is positioned, a second layer of cross braces 4 is arranged between the steel sheet pile 1 and the old box culvert 2, one end of each second layer of cross brace 4 is supported on the steel sheet pile 1, the other end of each second layer of cross brace is supported on the side plate of the old box culvert 2, meanwhile, a guide brace 5 is arranged in the old box culvert, the two ends of each guide brace 5 are respectively supported between the two side walls of the old box culvert 2, and the axes of the guide braces 5 and the second layer of cross braces 4 are on the same straight line; then, continuously excavating the foundation pit to the bottom elevation;
(4) As shown in fig. 5, a newly-built box culvert bottom plate 6 is poured, and a newly-built box culvert expanding blade foot 7 is poured between the newly-built box culvert bottom plate and the steel sheet pile; after the concrete reaches the design strength, removing the second layer of cross braces and the guide braces, and expanding blade feet to replace the second layer of cross braces to tightly prop up the steel sheet piles through the newly-built box culvert; the second layer of transverse braces and the guide braces must be removed synchronously, so that damage caused by unbalanced stress of the side plates of the old box culvert is avoided;
(5) As shown in fig. 6, pouring new box culvert side plates 8; after the newly-built box culvert side plate concrete reaches the design strength, backfilling medium coarse sand 9 between the newly-built box culvert side plate 8 and the steel sheet pile 1 to tightly prop the steel sheet pile 1;
(6) As shown in fig. 7, the first-layer wale 3 is removed; pouring a newly-built box culvert top plate 10 to complete the newly-built box culvert construction;
(7) As shown in fig. 8, the steel sheet piles are pulled out, and the foundation pit is backfilled to be level with the original ground, so that the box culvert expansion construction is completed.
Claims (1)
1. An urban rainwater box culvert capacity expansion construction method is characterized by comprising the following steps:
(1) Inserting and driving steel sheet piles at a certain distance from one side of the old box culvert extension according to the box culvert extension plan and scale;
(2) Excavating a foundation pit between the steel sheet pile and the side wall of the old box culvert, and when excavating to a position below the top plate of the old box culvert, arranging a first layer of cross braces between the steel sheet pile and the old box culvert, wherein one end of each first layer of cross brace is supported on the steel sheet pile, and the other end of each first layer of cross brace is supported at the intersection of the side wall of the old box culvert and the top plate along the cross section direction of the top plate of the old box culvert;
(3) Continuously excavating the foundation pit downwards to a position below the waist of the old box culvert, arranging a second layer of cross braces between the steel sheet pile and the old box culvert, wherein one end of each second layer of cross brace is supported on the steel sheet pile, the other end of each second layer of cross brace is supported on a side plate of the old box culvert, meanwhile, a guide brace is arranged in the old box culvert, two ends of each guide brace are respectively supported between two side walls of the old box culvert, and the axes of the guide brace and the second layer of cross braces are on the same straight line; then, continuously excavating the foundation pit to the bottom elevation;
(4) Pouring a newly-built box culvert bottom plate, pouring a newly-built box culvert expanding blade foot between the newly-built box culvert bottom plate and the steel sheet pile, removing a second layer of cross braces and guide braces after the concrete reaches the design strength, and replacing the second layer of cross braces to tightly prop the steel sheet pile through the newly-built box culvert expanding blade foot; the second layer of transverse braces and the guide braces must be removed synchronously, so that damage caused by unbalanced stress of the side plates of the old box culvert is avoided;
(5) Pouring a newly-built box culvert side plate; after the newly-built box culvert side plate concrete reaches the design strength, backfilling coarse sand between the newly-built box culvert side plate and the steel sheet pile to tightly prop the steel sheet pile;
(6) Removing the first layer of cross braces; pouring a newly-built box culvert top plate to complete the construction of the newly-built box culvert;
(7) And (5) pulling out the steel sheet pile, backfilling the foundation pit to be level to the original ground, and completing the capacity expansion construction of the box culvert.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310099080.XA CN115852868A (en) | 2023-02-09 | 2023-02-09 | Urban rainwater box culvert expansion construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310099080.XA CN115852868A (en) | 2023-02-09 | 2023-02-09 | Urban rainwater box culvert expansion construction method |
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| CN115852868A true CN115852868A (en) | 2023-03-28 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006348472A (en) * | 2005-06-13 | 2006-12-28 | Shimizu Corp | Width expanding construction method for existing underground tunnel |
| CN202745062U (en) * | 2012-08-13 | 2013-02-20 | 上海市政工程设计研究总院（集团）有限公司 | Foundation pit supporting structure closely adjacent to built-up underground structure |
| CN103866701A (en) * | 2012-12-14 | 2014-06-18 | 上海市政工程设计研究总院（集团）有限公司 | Construction method for reserved laterally widened structure of underground box culvert structure |
| CN104164839A (en) * | 2014-07-31 | 2014-11-26 | 天津市市政工程设计研究院 | Construction method for broadening box culvert |
| CN108487095A (en) * | 2018-03-27 | 2018-09-04 | 中冶南方工程技术有限公司 | A kind of box culvert connection construction technique |
-
2023
- 2023-02-09 CN CN202310099080.XA patent/CN115852868A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006348472A (en) * | 2005-06-13 | 2006-12-28 | Shimizu Corp | Width expanding construction method for existing underground tunnel |
| CN202745062U (en) * | 2012-08-13 | 2013-02-20 | 上海市政工程设计研究总院（集团）有限公司 | Foundation pit supporting structure closely adjacent to built-up underground structure |
| CN103866701A (en) * | 2012-12-14 | 2014-06-18 | 上海市政工程设计研究总院（集团）有限公司 | Construction method for reserved laterally widened structure of underground box culvert structure |
| CN104164839A (en) * | 2014-07-31 | 2014-11-26 | 天津市市政工程设计研究院 | Construction method for broadening box culvert |
| CN108487095A (en) * | 2018-03-27 | 2018-09-04 | 中冶南方工程技术有限公司 | A kind of box culvert connection construction technique |
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