CN110453687B - Protection structure of subway station foundation pit excavation pipeline and construction method - Google Patents
Protection structure of subway station foundation pit excavation pipeline and construction method Download PDFInfo
- Publication number
- CN110453687B CN110453687B CN201910705062.5A CN201910705062A CN110453687B CN 110453687 B CN110453687 B CN 110453687B CN 201910705062 A CN201910705062 A CN 201910705062A CN 110453687 B CN110453687 B CN 110453687B
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- pipeline
- concrete
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- subway station
- excavation
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- 238000009412 basement excavation Methods 0.000 title claims abstract description 26
- 238000010276 construction Methods 0.000 title claims abstract description 24
- 239000004567 concrete Substances 0.000 claims abstract description 45
- 239000004927 clay Substances 0.000 claims abstract description 19
- 239000004575 stone Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000010410 layer Substances 0.000 claims description 41
- 239000002689 soil Substances 0.000 claims description 31
- 239000002002 slurry Substances 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000010802 sludge Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a protection structure of a subway station foundation pit excavation pipeline and a construction method thereof, wherein the protection structure comprises concrete piles arranged on two sides of a pipeline body and rubber rings around the pipeline body, and a concrete bearing plate support is paved below the concrete piles; and paving a crushed stone layer and a compacted clay layer above the pipeline. The invention solves the problem of damage to pipelines caused by excavation of the foundation pit of the subway station in the prior art. The scheme has the advantages of simple construction, stable performance and long service life, can dynamically protect pipelines in the process of excavation of the foundation pit of the subway station, and simultaneously greatly improves the construction efficiency.
Description
Technical Field
The invention relates to the field of pipeline protection, in particular to a pipeline protection structure in the process of excavation of a foundation pit of a subway station and a construction method.
Background
With the acceleration of the urban process, urban subway construction is also getting hotter and hotter. Surrounding soil displacement and sedimentation can be caused in the process of excavation of the foundation pit of the subway station, so that pipelines are damaged. Meanwhile, the underground pipeline also bears the dead weight stress of the soil above the road. These factors can cause damage to the underground utility.
The protection scheme of the existing pipeline generally makes a whole set of protection measures before excavation of the foundation pit, and the later protection of the pipeline lacks timeliness.
Disclosure of Invention
Aiming at the defects of the prior art, the first aim of the invention is to provide a pipeline protection structure and a construction method in the excavation of a subway station foundation pit, so as to solve the problem of damage to the pipeline caused by the excavation of the subway station foundation pit.
To achieve the above object, the present invention provides a dynamic protection structure for a pipeline. In the excavation construction process of the foundation pit of the subway station, step-by-step protection measures are adopted. Each construction step is as follows:
step one: and before the first layer of soil is excavated, performing first-stage protection on the pipeline. And (3) forming holes at positions 3.5m away from the two sides of the pipeline, removing waste slurry and sludge, cleaning the holes, changing slurry, pouring concrete into a lower reinforcement cage and a steel guide pipe, and finally forming piles, wherein the diameter of each pile is 1.2m, the distance between each pile and the pipeline is 3.5m, and the positions of the pipelines are required to be paid attention to while setting the concrete piles.
Step two: and before the second layer of soil is excavated, performing second-stage protection on the pipeline, and completing the support structure of the concrete bearing plate. Digging trenches and step surfaces on two sides of the pipeline, and spraying concrete on the step surfaces; the surface of the pipeline is sleeved with a layer of rubber protection ring with the thickness of 2cm, and the rubber protection ring is tightly attached to the pipeline; a concrete bearing plate with the thickness of 20cm is arranged at the bottom of the pipeline, a concrete jack with the width of 5cm is arranged above the bearing plate, and the width of the bearing plate is flush with the groove; concrete straight plates with the thickness of 20cm are inserted on two sides of the pipeline, the height of each straight plate is flush with the vertex of the pipeline, grooves are formed in the middle of the top and the lower portion of each straight plate, the width of each groove is 5cm, and an arch bearing plate with the thickness of 15cm is inserted in each groove. The arch bearing plate is tightly connected with the straight plate, and the straight plate is tightly connected with the concrete bearing plate, so that the joint is reinforced when necessary.
Step three: and before the third layer soil is excavated, performing third-stage protection on the pipeline. A compacted clay layer with the thickness of 0.5m is paved above the pipeline, a crushed stone layer with the thickness of 0.1m is paved above the clay, and the compacted clay layer is continuously paved above the crushed stone layer. The operation is repeated until the soil is laid on the surface layer, and the surface soil is compacted by a compacting machine.
Through the technical scheme, the invention can realize effective protection of pipelines.
In particular, before the first layer of soil is excavated, the displacement of soil around the pipeline can be reduced by the concrete pile, and the isolation effect is achieved.
The sprayed concrete in the second step can be used for reinforcing the step surface, and meanwhile, the stability of the pipeline protection structure is improved. The protection method of the concrete bottom plate can effectively cope with the displacement and sedimentation of the soil body after the second layer of soil is excavated, and simultaneously, the pipeline is also fixed. The rubber protection ring further plays a role in protecting pipelines, and the arched bearing plate can lighten upper load.
The crushed stone layer in the third step can reduce the extrusion of the soil body to the pipeline after the third layer of soil is excavated, the strength of the upper soil layer is improved, and the compacted clay plays a role in buffering the compression of the upper load to the pipeline.
The construction of the pipeline and the construction of the subway station are simultaneously carried out, so that the dynamic protection of the pipeline is realized while the construction time is shortened. The corresponding 7, 9 and 11 in the figure are all prefabricated reinforced concrete members.
Through the scheme, pipelines near the subway station excavation can be effectively protected, meanwhile, the construction efficiency is improved, and the influence of large-area excavation of the foundation pit on the pipelines is greatly relieved.
Drawings
Fig. 1 is a schematic diagram of a pipeline protection structure in the subway station excavation process in the present embodiment.
Fig. 2 is a schematic diagram of the protection structure of step 1 in the present embodiment.
Fig. 3 is a schematic diagram of the protection structure of step 2 in this embodiment.
Fig. 4 is a schematic diagram of the protection structure of step 3 in this embodiment.
Fig. 5 is a schematic view of the structure of the concrete bearing plate support in this example.
Reference numerals illustrate: 1. a first layer of soil; 2. existing pipelines; 3. a concrete pile; 4. a second layer of soil; 5. a step surface; 6. a rubber protection ring; 7. a concrete carrier plate; 8. a concrete jack; 9. a concrete straight plate; 10. a groove; 11. an arched bearing plate; 12. a third layer of soil; 13. compacting clay; 14. a crushed stone layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment discloses a protection structure and a construction method for a subway station foundation pit excavation pipeline, wherein the protection schematic diagram of the pipeline structure around the subway excavation process is shown in fig. 1;
before the first layer of soil 1 is excavated, concrete piles 3 are arranged on two sides of a pipeline 2; before the second layer of soil 4 is excavated, step surfaces 5 are excavated on two sides of a pipeline, the pipeline is wrapped by a rubber protection ring 6, a concrete bearing plate 7 is arranged below the pipeline, a socket 8 above the concrete bearing plate is inserted into a concrete straight plate 9 on the bearing plate, a groove 10 is arranged between the upper end of the straight plate and the lower end of the straight plate, an arch bearing plate 11 is inserted into the upper end of the groove 10, a compacted clay layer 13 with the thickness of 0.5m is paved above the pipeline before the third layer of soil 12 is excavated, and a crushed stone layer 14 with the thickness of 0.1m is paved above the clay layer.
Subway station excavation and pipeline protection are performed simultaneously as shown in fig. 1.
The step surface is reinforced by spraying concrete as shown in fig. 3. The concrete straight plate 9 is tightly connected with the concrete bearing plate 7, and the joint is reinforced if necessary.
The arch-shaped bearing plate 11 is located at the very center of the pipeline as shown in fig. 3.
Step one: the first-stage protection of the pipeline is carried out before the first layer of soil 1 is excavated. And (3) forming holes on two sides of the pipeline 2, removing waste slurry and sludge, cleaning holes, changing slurry, pouring concrete in a lower reinforcement cage and a steel guide pipe, and finally forming a pile, wherein the diameter of the pile is 1.2m, the distance between the pile and the pipeline is 3.5m, and the embedding depth of the pile is 10m. Finally, the concrete pile 2 is formed.
Step two: and before the second layer of soil 4 is excavated, performing second-stage pipeline protection to finish the support structure of the concrete bearing plate. According to the geophysical prospecting diagram, the pipe position and the trend of each pipeline are obtained, the well-defined pipeline is perforated according to the distance of 20m, the burial depth and the trend of the well-defined pipeline are confirmed, the corner position is found at the corner of the pipeline, and the trend of the pipeline after the angle change is well-defined. After the direction of the pipeline is positioned, digging ditches on two sides of the pipeline by using an excavator, manually tamping and leveling out a step surface 5, and spraying concrete on the step surface; wrapping the pipeline by using a rubber sheet, fixing the pipeline and the rubber sheet at the joint by using strong glue or adhesive tape, and finally forming a rubber protection ring with the thickness of 2 cm; and a concrete bearing plate 7 with the thickness of 20cm is arranged along the bottom of the pipeline right below, so that the concrete bearing plate is tightly attached to the pipeline, and the pipeline can be supported on the bearing plate. A socket 8 is arranged above the bearing plate, and the width of the bottom plate is flush with the groove; concrete straight plates 9 with the thickness of 20cm are inserted at two sides of the pipeline, the height of the straight plates is leveled with the vertex of the pipeline by using a ruler, a groove 10 is arranged in the middle of the top of the straight plates, and an arch bearing plate 11 with the thickness of 15cm is inserted in the groove. The space between the pipeline and the support is filled with compacted clay. And finally covering the pipeline bracket to the step surface by compacted clay.
Step three: a third pipeline protection is performed before the third layer of soil 12 is excavated. A 0.5m thick well graded compacted clay 13 was laid over the pipeline. After the first fill was leveled, a crushed stone layer 14 of 0.1m thickness was laid over the clay of the compacted clay. After the second layer of broken stone is leveled and filled with soil, a clay layer is continuously paved and compacted above the broken stone layer, the operation is repeated until the broken stone is paved on the ground surface layer, and the ground surface is leveled and filled with soil by using a vibrating compactor. And after the arrangement is completed, continuing to excavate the third layer of soil.
While the embodiments of the present invention have been described in detail, the foregoing embodiments are merely preferred embodiments of the present invention, the present invention is not limited to the above embodiments, and various changes may be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (4)
1. The construction method of the protection structure of the excavation pipeline of the subway station foundation pit is characterized by protecting the pipeline step by step aiming at different excavation sections of the subway station, effectively reducing the damage of the one-time excavation of the subway station foundation pit to the pipeline, and comprises the following construction steps of:
step one: dividing the subway station excavation process into three sections; before the first layer of soil (1) is excavated, carrying out first-stage protection on the pipeline; forming holes at the positions 3m on two sides of the existing pipeline (2), removing waste slurry and sludge, cleaning the holes, changing slurry, placing a reinforcement cage and a steel guide pipe, pouring concrete, and finally forming a concrete pile (3);
step two: before the second layer of soil (4) is excavated, performing second-stage protection on the pipeline, completing a support structure of the concrete bearing plate, excavating trenches and step surfaces (5) on two sides of the pipeline, spraying concrete on the step surfaces, and performing reinforcement treatment on the step surfaces; a layer of rubber protection ring (6) with the thickness of 2cm is sleeved on the surface of the pipeline, and the rubber protection ring is tightly attached to the pipeline; a concrete bearing plate (7) with the thickness of 20cm is arranged at the bottom of the pipeline, and the concrete bearing plate is tightly attached to the rubber protection ring, so that the pipeline is ensured to be supported on the concrete bearing plate; a concrete jack (8) with the width of 5cm is arranged above the bearing plate, and the width of the bearing plate is flush with the groove; concrete straight plates (9) with the thickness of 20cm are inserted at two sides of the pipeline, the height of each straight plate is flush with the upper end point of the pipeline, grooves (10) are formed in the middle of the top and the lower part of each straight plate, the width of each groove is 5cm, an arch-shaped bearing plate (11) with the thickness of 15cm is inserted in each groove, and meanwhile, the support structure is covered to the step surface by compacted clay;
step three: before the third layer of soil (12) is excavated, performing third-stage protection on the pipeline; backfilling the step surface, paving a compacted clay layer (13) with the thickness of 0.5m above the step surface, paving a crushed stone layer (14) with the thickness of 0.1m above the clay, continuously paving the compacted clay layer above the crushed stone layer, repeating the operation until the compacted clay layer is paved on the surface layer, and compacting the surface layer soil by using a compacting machine.
2. The construction method of the subway station foundation pit excavation pipeline protection structure according to claim 1, wherein the construction method comprises the following steps: the construction process corresponds to the excavation sections of the subway station one by one, and the dynamic protection of the pipeline is formed.
3. The construction method of the subway station foundation pit excavation pipeline protection structure according to claim 1, wherein the construction method comprises the following steps: the protection structure is applicable to flexible pipelines and rigid pipelines; and the occurrence of excessive longitudinal stress generated by excavation of the foundation pit is avoided, so that the cross section of the foundation pit is cracked or the damage is caused by the occurrence of larger corners at joint parts.
4. The construction method of the subway station foundation pit excavation pipeline protection structure according to claim 1, wherein the construction method comprises the following steps: the concrete bearing plate (7), the concrete straight plate (9) and the arch bearing plate (11) are reinforced concrete prefabricated parts; the pile end of the concrete pile is inserted into a hard soil layer, and the distance between the concrete pile and the existing pipeline is about 3m, and the distance cannot be too close or too far.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910705062.5A CN110453687B (en) | 2019-07-31 | 2019-07-31 | Protection structure of subway station foundation pit excavation pipeline and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910705062.5A CN110453687B (en) | 2019-07-31 | 2019-07-31 | Protection structure of subway station foundation pit excavation pipeline and construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110453687A CN110453687A (en) | 2019-11-15 |
| CN110453687B true CN110453687B (en) | 2024-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910705062.5A Active CN110453687B (en) | 2019-07-31 | 2019-07-31 | Protection structure of subway station foundation pit excavation pipeline and construction method |
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| Country | Link |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113669506B (en) * | 2021-08-30 | 2022-11-11 | 大昌建设集团有限公司 | Municipal administration pipeline protection architecture |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101235649A (en) * | 2008-02-22 | 2008-08-06 | 上海市政工程设计研究总院 | Covered digging system for pit |
| KR20110130196A (en) * | 2010-05-27 | 2011-12-05 | 주식회사 코아이엔씨 | Subway platform and construct method of subway platform |
| CN106120801A (en) * | 2016-08-18 | 2016-11-16 | 中铁隧道集团二处有限公司 | In water-rich sand layer, pipeline crosses the construction method at foundation ditch |
| CN205954632U (en) * | 2016-08-18 | 2017-02-15 | 中铁隧道集团二处有限公司 | Pipeline crosses supporting construction of foundation ditch department in rich water sand layer |
| CN108252327A (en) * | 2017-12-29 | 2018-07-06 | 上海市机械施工集团有限公司 | The construction method of Large Underground high voltage substation |
| CN109972666A (en) * | 2019-04-19 | 2019-07-05 | 中铁建大桥工程局集团第四工程有限公司 | Excavation of subway foundation pit controls the existing construction method for closing on pipeline disturbance |
-
2019
- 2019-07-31 CN CN201910705062.5A patent/CN110453687B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101235649A (en) * | 2008-02-22 | 2008-08-06 | 上海市政工程设计研究总院 | Covered digging system for pit |
| KR20110130196A (en) * | 2010-05-27 | 2011-12-05 | 주식회사 코아이엔씨 | Subway platform and construct method of subway platform |
| CN106120801A (en) * | 2016-08-18 | 2016-11-16 | 中铁隧道集团二处有限公司 | In water-rich sand layer, pipeline crosses the construction method at foundation ditch |
| CN205954632U (en) * | 2016-08-18 | 2017-02-15 | 中铁隧道集团二处有限公司 | Pipeline crosses supporting construction of foundation ditch department in rich water sand layer |
| CN108252327A (en) * | 2017-12-29 | 2018-07-06 | 上海市机械施工集团有限公司 | The construction method of Large Underground high voltage substation |
| CN109972666A (en) * | 2019-04-19 | 2019-07-05 | 中铁建大桥工程局集团第四工程有限公司 | Excavation of subway foundation pit controls the existing construction method for closing on pipeline disturbance |
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| CN110453687A (en) | 2019-11-15 |
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