CN114032916A - Method for dismantling inner support of foundation pit of mountain-facing body - Google Patents
Method for dismantling inner support of foundation pit of mountain-facing body Download PDFInfo
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- CN114032916A CN114032916A CN202111400018.7A CN202111400018A CN114032916A CN 114032916 A CN114032916 A CN 114032916A CN 202111400018 A CN202111400018 A CN 202111400018A CN 114032916 A CN114032916 A CN 114032916A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010276 construction Methods 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 238000004078 waterproofing Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000002411 adverse Effects 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 claims abstract description 4
- 239000002689 soil Substances 0.000 claims description 9
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 230000007306 turnover Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 1
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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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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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
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/12—Back-filling of foundation trenches or ditches
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention relates to a method for dismantling an inner support of a foundation pit of a mountain; arranging a drainage ditch at the side of the foundation pit before the foundation pit construction, and preventing the underground water from causing adverse effect on the foundation pit; completing the construction of the negative second-layer bottom plate; pouring concrete support-changing belts between the bottom plate and the support piles around the deep foundation pit; pouring construction is carried out on the negative second-layer outer wall and the negative second-layer top plate; waterproofing the outer wall, and backfilling between the second-layer outer wall and the supporting piles; constructing a negative layer outer wall and a negative layer top plate; and backfilling. The method is favorable for transmitting outside pressure, ensures that all the section steels form an integral supporting system, ensures that the steel pipes and the I-shaped steels are common turnover materials on site, is convenient to erect and dismantle, and is suitable for dismantling the multi-channel inner supports of the deep foundation pit close to the mountain.
Description
Technical Field
The invention relates to the technical field of foundation pit construction, in particular to a method for dismantling an inner support of a foundation pit of a mountain.
Background
With the increasing shortage of land resources in urban centers, more and more high-rise buildings are built, the urban area is gradually enlarged towards suburbs, more and more mountains are excavated into flat ground, and the flat ground beside the mountains becomes a building planning ground. The peripheral address of the foundation pit in the suburb range is complex, the foundation pit is close to a mountain and can become a common site of a newly-built building, the environment of the mountain is complex, the underground water level is high, the influence of severe weather is large, the requirements on the design and construction of foundation pit supporting are very strict, the foundation pit mainly adopts a supporting pile, anchor rope and inner support supporting scheme, and the safe replacement and dismantling of the inner support becomes a key factor of foundation pit safety accidents.
Disclosure of Invention
The invention aims to provide a method for removing an inner support of a foundation pit close to a mountain.
In order to achieve the above object, the present invention is realized by:
a method for dismantling an inner support of a foundation pit adjacent to a mountain body comprises
Step 1, arranging a drainage ditch at the side of a foundation pit before foundation pit construction, and preventing underground water from causing adverse effects on the foundation pit;
step 2, after foundation pit construction is finished and basement engineering pile construction is finished, firstly, completing construction of a bottom plate of a negative second floor;
step 3, after the construction of the bottom plate is completed, pouring C30 concrete support-changing belts with the thickness of 500mm between the bottom plate and the support piles at the periphery of the deep foundation pit;
step 4, after the strength grade of the concrete of the support belt is changed to 90%, pouring construction is carried out on the negative second-layer outer wall and the negative second-layer top plate;
step 5, after the construction of the negative second-layer top plate is completed, performing outer wall waterproofing, then backfilling between the negative second-layer outer wall and the supporting piles, pouring C30 concrete with the thickness of 500mm to replace a supporting belt when backfilling is carried out to the negative second-layer top plate, and removing a second supporting beam when the strength of the concrete reaches 90%;
step 6, after the second supporting beam is removed, constructing an outer wall with a layer of negative layer and a top plate with a layer of negative layer, after the top plate is poured, performing outer wall waterproofing, after the waterproofing construction is completed, performing backfill on the outer wall and the supporting pile, and removing the first supporting beam after backfilling;
step 7, backfilling between the negative layer outer wall and the supporting pile after the demolition is finished, wherein the demolition sequence is that a support beam is firstly followed by an upright post; because the foundation pit is positioned beside the mountain, the side slope drainage is extremely important, no construction road is arranged beside the foundation pit, the backfill material is obviously selected from backfill, so that the construction process is complex, the consumed time for transferring the soil body is long, the safety coefficient depends on the tamping degree of constructors on the soil, the field construction period and the foundation pit safety are greatly influenced, and the backfill material is changed from backfill soil to C15 concrete; the central line of the support changing belt is consistent with the central line of the thickness of the floor slab, so that the safety and stability of the structure can be ensured.
The method for dismantling the inner support of the foundation pit adjacent to the mountain is characterized in that: still include the safeguard measure to basement car ramp, it is specific, use the double-pin 18# I-steel to prop in the top of car ramp, the tip of 18# I-steel and the pre-buried steel sheet welded fastening of car ramp both sides concrete wall, the scaffold frame support is established to 18# I-steel.
According to the invention, the intercepting ditch is used for intercepting water, so that the side pressure of a water body to the foundation pit is reduced, and the support is replaced by the support replacement belt between the basement outer wall and the support pile, so that the basement outer wall is not unstable when the support is removed; the support system that car ramp department adopted I-steel and steel pipe to set up has guaranteed that basement outer wall lateral pressure can not increase because of interior support system's demolishs, has also guaranteed structural safety simultaneously, is favorable to outside pressure transmission, guarantees structural safety and outer wall waterproof requirement, connects welded fastening with the steel pipe drawing between every shaped steel roof beam, ensures that all shaped steel form an integral support system, and steel pipe and I-steel all belong to on-the-spot common turnover material, set up and demolish the process convenience. The method is suitable for removing the multi-channel inner support of the deep foundation pit close to the mountain.
Drawings
Fig. 1 is a first schematic diagram of the demolition method.
Fig. 2 is a schematic diagram of the second step of the demolition method.
Fig. 3 is a schematic flow chart of the demolition method.
Detailed Description
The invention is further illustrated by the following specific examples.
As shown in fig. 1 to 3, a method for removing an inner support of a foundation pit of a mountain comprises
Step 1, arranging a drainage ditch at the side of a foundation pit before foundation pit construction, and preventing underground water from causing adverse effects on the foundation pit;
step 2, after foundation pit construction is finished and basement engineering pile construction is finished, firstly, completing construction of a bottom plate of a negative second floor;
step 3, after the construction of the bottom plate is completed, pouring C30 concrete support-changing belts with the thickness of 500mm between the bottom plate and the support piles at the periphery of the deep foundation pit;
step 4, after the strength grade of the concrete of the support belt is changed to 90%, pouring construction is carried out on the negative second-layer outer wall and the negative second-layer top plate;
step 5, after the construction of the negative second-layer top plate is completed, performing outer wall waterproofing, then backfilling between the negative second-layer outer wall and the supporting piles, pouring C30 concrete with the thickness of 500mm to replace a supporting belt when backfilling is carried out to the negative second-layer top plate, and removing a second supporting beam when the strength of the concrete reaches 90%;
step 6, after the second supporting beam is removed, constructing an outer wall with a layer of negative layer and a top plate with a layer of negative layer, after the top plate is poured, performing outer wall waterproofing, after the waterproofing construction is completed, performing backfill on the outer wall and the supporting pile, and removing the first supporting beam after backfilling;
step 7, backfilling between the negative layer outer wall and the supporting pile after the demolition is finished, wherein the demolition sequence is that a support beam is firstly followed by an upright post; because the foundation pit is positioned beside the mountain, the side slope drainage is extremely important, no construction road is arranged beside the foundation pit, the backfill material is obviously selected from backfill, so that the construction process is complex, the consumed time for transferring the soil body is long, the safety coefficient depends on the tamping degree of constructors on the soil, the field construction period and the foundation pit safety are greatly influenced, and the backfill material is changed from backfill soil to C15 concrete; the central line of the support changing belt is consistent with the central line of the thickness of the floor slab, so that the safety and stability of the structure can be ensured.
The method for dismantling the inner support of the foundation pit adjacent to the mountain is characterized in that: still include the safeguard measure to basement car ramp, it is specific, use the double-pin 18# I-steel to prop in the top of car ramp, the tip of 18# I-steel and the pre-buried steel sheet welded fastening of car ramp both sides concrete wall, the scaffold frame support is established to 18# I-steel.
According to the invention, the intercepting ditch is used for intercepting water, so that the side pressure of a water body to the foundation pit is reduced, and the support is replaced by the support replacement belt between the basement outer wall and the support pile, so that the basement outer wall is not unstable when the support is removed; the support system that car ramp department adopted I-steel and steel pipe to set up has guaranteed that basement outer wall lateral pressure can not increase because of interior support system's demolishs, has also guaranteed structural safety simultaneously, is favorable to outside pressure transmission, guarantees structural safety and outer wall waterproof requirement, connects welded fastening with the steel pipe drawing between every shaped steel roof beam, ensures that all shaped steel form an integral support system, and steel pipe and I-steel all belong to on-the-spot common turnover material, set up and demolish the process convenience. The method is suitable for removing the multi-channel inner support of the deep foundation pit close to the mountain.
Claims (2)
1. A method for dismantling an inner support of a foundation pit adjacent to a mountain is characterized by comprising the following steps: comprises that
Step 1, arranging a drainage ditch at the side of a foundation pit before foundation pit construction, and preventing underground water from causing adverse effects on the foundation pit;
step 2, after foundation pit construction is finished and basement engineering pile construction is finished, firstly, completing construction of a bottom plate of a negative second floor;
step 3, after the construction of the bottom plate is completed, pouring C30 concrete support-changing belts with the thickness of 500mm between the bottom plate and the support piles at the periphery of the deep foundation pit;
step 4, after the strength grade of the concrete of the support belt is changed to 90%, pouring construction is carried out on the negative second-layer outer wall and the negative second-layer top plate;
step 5, after the construction of the negative second-layer top plate is completed, performing outer wall waterproofing, then backfilling between the negative second-layer outer wall and the supporting piles, pouring C30 concrete with the thickness of 500mm to replace a supporting belt when backfilling is carried out to the negative second-layer top plate, and removing a second supporting beam when the strength of the concrete reaches 90%;
step 6, after the second supporting beam is removed, constructing an outer wall with a layer of negative layer and a top plate with a layer of negative layer, after the top plate is poured, performing outer wall waterproofing, after the waterproofing construction is completed, performing backfill on the outer wall and the supporting pile, and removing the first supporting beam after backfilling;
step 7, backfilling between the negative layer outer wall and the supporting pile after the demolition is finished, wherein the demolition sequence is that a support beam is firstly followed by an upright post; because the foundation pit is positioned beside the mountain, the side slope drainage is extremely important, no construction road is arranged beside the foundation pit, the backfill material is obviously selected from backfill, so that the construction process is complex, the consumed time for transferring the soil body is long, the safety coefficient depends on the tamping degree of constructors on the soil, the field construction period and the foundation pit safety are greatly influenced, and the backfill material is changed from backfill soil to C15 concrete; the central line of the support changing belt is consistent with the central line of the thickness of the floor slab, so that the safety and stability of the structure can be ensured.
2. The method for dismantling the inner support of the foundation pit of the clinical mountain body as claimed in claim 1, wherein: still include the safeguard measure to basement car ramp, it is specific, use the double-pin 18# I-steel to prop in the top of car ramp, the tip of 18# I-steel and the pre-buried steel sheet welded fastening of car ramp both sides concrete wall, the scaffold frame support is established to 18# I-steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111400018.7A CN114032916A (en) | 2021-11-24 | 2021-11-24 | Method for dismantling inner support of foundation pit of mountain-facing body |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111400018.7A CN114032916A (en) | 2021-11-24 | 2021-11-24 | Method for dismantling inner support of foundation pit of mountain-facing body |
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| CN114032916A true CN114032916A (en) | 2022-02-11 |
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| CN202111400018.7A Pending CN114032916A (en) | 2021-11-24 | 2021-11-24 | Method for dismantling inner support of foundation pit of mountain-facing body |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116220053A (en) * | 2023-03-17 | 2023-06-06 | 苏州基实新建筑科技有限公司 | Efficient green support-changing type basement foundation pit construction method |
| CN116815780A (en) * | 2023-06-01 | 2023-09-29 | 中国建筑第四工程局有限公司 | Deep and large foundation pit steel pipe shotcrete support conversion anchor cable support construction method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110029674A (en) * | 2019-04-18 | 2019-07-19 | 江苏省华建建设股份有限公司 | A kind of bracing demolition and basement construction method for deep basal pit |
-
2021
- 2021-11-24 CN CN202111400018.7A patent/CN114032916A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110029674A (en) * | 2019-04-18 | 2019-07-19 | 江苏省华建建设股份有限公司 | A kind of bracing demolition and basement construction method for deep basal pit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116220053A (en) * | 2023-03-17 | 2023-06-06 | 苏州基实新建筑科技有限公司 | Efficient green support-changing type basement foundation pit construction method |
| CN116815780A (en) * | 2023-06-01 | 2023-09-29 | 中国建筑第四工程局有限公司 | Deep and large foundation pit steel pipe shotcrete support conversion anchor cable support construction method |
| CN116815780B (en) * | 2023-06-01 | 2024-08-23 | 中建珠江海外发展有限公司 | Deep and large foundation pit steel pipe shotcrete support conversion anchor cable support construction method |
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Application publication date: 20220211 |