CN115198766A - Method for treating water permeation of strongly weathered argillaceous sandstone layer in deep foundation pit engineering - Google Patents
Method for treating water permeation of strongly weathered argillaceous sandstone layer in deep foundation pit engineering Download PDFInfo
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- CN115198766A CN115198766A CN202210983954.3A CN202210983954A CN115198766A CN 115198766 A CN115198766 A CN 115198766A CN 202210983954 A CN202210983954 A CN 202210983954A CN 115198766 A CN115198766 A CN 115198766A
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- foundation pit
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000010410 layer Substances 0.000 claims description 40
- 239000004744 fabric Substances 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000011241 protective layer Substances 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000004062 sedimentation Methods 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 230000008595 infiltration Effects 0.000 claims description 3
- 238000001764 infiltration Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 238000005755 formation reaction Methods 0.000 claims 2
- 238000005507 spraying Methods 0.000 claims 1
- 206010003549 asthenia Diseases 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Images
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
- 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
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
-
- 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
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/20—Restraining of underground water by damming or interrupting the passage of underground water by displacing the water, e.g. by compressed air
-
- 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
- E02D29/16—Arrangement or construction of joints in foundation structures
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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
- E02D31/025—Draining membranes, sheets or fabric specially adapted therefor, e.g. with dimples
-
- 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
- E02D5/74—Means for anchoring structural elements or bulkheads
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/04—Pipes or fittings specially adapted to sewers
- E03F3/046—Open sewage channels
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/22—Adaptations of pumping plants for lifting sewage
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to the technical field of foundation pit engineering, in particular to a method for treating water permeation of a strongly weathered argillaceous sandstone layer in deep foundation pit engineering.
Description
Technical Field
The invention relates to the technical field of foundation pit engineering, in particular to a method for treating water permeation of a strongly weathered argillaceous sandstone layer of deep foundation pit engineering.
Background
In the current urban construction, deep foundation pit construction frequently appears in super high-rise buildings and large-scale construction sites, deep foundation pit engineering is continuously perfected through continuous practical experience, a supporting structure system which is suitable for different foundation pit depths and geological conditions and is economical and reasonable is gradually formed, when the existing deep foundation pit is dug downwards to a strongly weathered argillaceous sandstone layer, the water seepage situation can occur between the strongly weathered argillaceous sandstone layer and the pebble layer, and the strongly weathered argillaceous sandstone loses strength after meeting water, so that the phenomenon that the deep foundation pit wall falls off occurs, the deep foundation pit wall falls off for a long time and is easy to collapse, a submersible pump is buried, and the construction safety is difficult to guarantee.
Disclosure of Invention
The invention aims to solve the problems, and provides a method for treating water permeation of a strongly weathered argillaceous sandstone layer in deep foundation pit engineering.
The invention solves the problems and adopts the technical scheme that:
a method for treating water permeation of a strongly weathered argillaceous sandstone layer of deep foundation pit engineering comprises the following steps:
the method comprises the following steps: and (3) supporting the excavated deep foundation pit, and vertically driving a steel pipe into the strongly weathered argillaceous sandstone layer part of the wall of the deep foundation pit along the wall of the foundation pit for supporting and reinforcing.
Step two: the method comprises the following steps of drilling a plurality of rows of fixing holes in the wall of a strongly weathered argillaceous sandstone layer pit by using an anchor rod drilling machine, arranging fixing rods in the fixing holes, manufacturing the fixing rods by using deformed steel bars, injecting waterproof concrete into the positioning holes by using a high-pressure grouting machine, and reinforcing the connection of the end heads of the fixing rods in the horizontal direction by using reinforcing steel bars.
Step three: after the injected waterproof concrete is initially set, a reinforcing mesh is laid on the wall of the strongly weathered argillaceous sandstone layer and the waterproof concrete is sprayed to manufacture a waterproof protective layer.
Step four: and laying a layer of waterproof cloth outside the waterproof protective layer, and screwing the nut and the fixing rod to fix the waterproof cloth.
Step five: and arranging a water drainage hole at the bottom of the pebble layer and above the interface with the strongly weathered argillaceous sandstone layer, filling gravel stones into the water drainage hole, inserting a water drainage pipe, and reserving the water drainage pipe with a certain length outside the foundation pit wall.
Step six: the drainage ditch and the water collecting well are arranged at the bottom of the foundation pit, so that water flowing out of the drain pipe flows into the water collecting well through the drainage ditch, is pumped to the ground sedimentation tank by using a water pump, and is discharged to the outside of a construction site.
Compared with the prior art, the invention adopting the technical scheme has the outstanding characteristics that:
the method can lead the underground water in the deep foundation pit wall out through the drain pipe, flow into the drainage ditch through the waterproof cloth, and flow into the water collecting well for uniform treatment, thereby blocking the contact between the underground water and the strongly weathered argillaceous sandstone layer pit wall, preventing the pit wall from falling off caused by the strength loss of the strongly weathered argillaceous sandstone layer pit wall when the pit wall meets water, and simultaneously ensuring the construction safety.
Preferably, the invention further comprises:
the early strength agent and the accelerator are added into the waterproof concrete.
The body of the water drain pipe in the water drain hole is fully perforated with the flower holes, and the outer wall of the water drain pipe is wrapped by dense mesh cloth.
Drawings
FIG. 1 is a schematic front view of an embodiment of the present invention;
FIG. 2 is a schematic partial cross-sectional view of an embodiment of the present invention;
FIG. 3 is a schematic diagram of a partial top view of an embodiment of the present invention;
labeled in the figure as: the water-proof sand-rock composite material comprises a strongly weathered argillaceous sandstone layer 1, a pebble layer 2, a water drain pipe 3, a water-proof protective layer 4, a waterproof cloth 5, a fixing rod 6, a drainage ditch 7, a steel pipe 8, a water drain hole 9, a fixing hole 10 and a water collecting well 11.
Detailed Description
The invention will be further described with reference to the following examples, which are included merely for the purpose of illustration and are not intended to limit the scope of the invention.
Referring to fig. 1-3, a method for treating water infiltration of a strongly weathered argillaceous sandstone layer of deep foundation pit engineering comprises the following steps:
the method comprises the following steps: and (3) supporting the excavated deep foundation pit, and vertically driving a steel pipe into the deep foundation pit wall along the foundation pit wall to support and reinforce the deep foundation pit wall at the strongly weathered argillaceous sandstone layer part.
Step two: the method comprises the following steps of drilling a plurality of rows of fixing holes in the wall of the strongly weathered argillaceous sandstone layer by using an anchor rod drilling machine, arranging fixing rods in the fixing holes, manufacturing the fixing rods by using deformed steel bars, injecting waterproof concrete into the positioning holes by using a high-pressure grouting machine, and reinforcing the ends of the fixing rods to be connected in the horizontal direction by using reinforcing steel bars.
Step three: after the injected waterproof concrete is initially set, a reinforcing mesh is laid on the wall of the strongly weathered argillaceous sandstone layer and the waterproof concrete is sprayed to manufacture a waterproof protective layer.
Step four: and laying a layer of waterproof cloth outside the waterproof protective layer, and fixing the waterproof cloth by screwing the nut and the fixing rod.
Step five: and a drain hole is formed in the bottom of the pebble layer and above the interface with the strongly weathered argillaceous sandstone layer, gravel stones are filled into the drain hole, a drain pipe is inserted into the drain hole, and the drain pipe with a certain length is reserved on the outer side of the foundation pit wall.
Step six: the drainage ditch and the water collecting well are arranged at the bottom of the foundation pit, so that water flowing out of the water drain pipe flows into the water collecting well through the drainage ditch, is pumped to the ground sedimentation tank by using a water pump, and is discharged to the outside of a construction site.
An early strength agent and an accelerating agent are added into the waterproof concrete; the strength of the concrete is increased, and the setting time of the concrete can be shortened.
The body of the drain pipe in the drain hole is fully perforated with the flower hole, and the outer wall of the drain pipe is wrapped by dense mesh cloth; the pipe body is full of the flower holes, underground water can be led out easily, the seepage flow of underground water is increased, and the wrapped dense mesh net cloth can effectively prevent sand stones and soil from entering the flower holes of the water drain pipe to block the water drain pipe.
One specific embodiment of the present invention:
the method comprises the following steps: and (3) supporting the excavated deep foundation pit, vertically driving phi 48 x 3.6 steel pipes into the deep foundation pit wall along the wall of the foundation pit for supporting and reinforcing at the position of the strongly weathered argillaceous sandstone layer of the deep foundation pit wall, wherein the spacing is 300mm, the length is 3000mm, and the deep foundation pit is embedded into the ground for 600mm.
Step two: a rockbolt drilling machine is used for drilling a plurality of rows of fixing holes in the wall of a strongly weathered argillaceous sandstone layer, the diameter of each fixing hole is 150mm, the depth of each fixing hole is 9m, the hole interval is 1000mm, fixing rods are arranged in the fixing holes and made of phi 25 deformed steel bars, a high-pressure grouting machine is used for injecting waterproof concrete into the positioning holes, and phi 22 steel bars are used for reinforcing connection in the horizontal direction of the ends of the fixing rods.
Step three: after the waterproof concrete is injected for initial setting, a phi 6 x 200mm reinforcing mesh is laid on the wall of the strongly weathered argillaceous sandstone layer, and C20 waterproof concrete with the thickness of 80mm is sprayed to manufacture a waterproof protective layer.
Step four: and laying a layer of waterproof cloth outside the waterproof protective layer, and fixing the waterproof cloth by screwing the nut and the fixing rod.
Step five: a water drain hole is formed in the bottom of the pebble layer and above the interface of the pebble layer and the strongly weathered argillaceous sandstone layer, gravel stones are filled into the water drain hole, a PVC water drain pipe with the length of 600mm and the diameter of 110mm is inserted into the PVC water drain pipe, the water drain pipe with the length of 100mm is reserved on the outer side of the foundation pit wall, a flower hole is fully drilled in the water drain pipe body in the water drain hole, and the outer wall of the water drain pipe body is wrapped by dense mesh cloth.
Step six: the drainage ditch and the water collecting well are arranged at the bottom of the foundation pit, so that water flowing out of the water drain pipe flows into the water collecting well through the drainage ditch, is pumped to the ground sedimentation tank by using a water pump, and is discharged to the outside of a construction site.
The method can lead the underground water in the deep foundation pit wall out through the drain pipe, flow into the drainage ditch through the waterproof cloth, and flow into the water collecting well for uniform treatment, thereby blocking the contact between the underground water and the strongly weathered argillaceous sandstone layer pit wall, preventing the pit wall from falling off due to the strength loss of the strongly weathered argillaceous sandstone layer pit wall when meeting water, and simultaneously ensuring the construction safety.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.
Claims (3)
1. A method for treating water permeation of a strongly weathered argillaceous sandstone layer of deep foundation pit engineering is characterized by comprising the following steps:
the method comprises the following steps: supporting the excavated deep foundation pit, and vertically driving a steel pipe along the wall of the foundation pit at the position of the strongly weathered argillaceous sandstone layer of the wall of the deep foundation pit for supporting and reinforcing;
step two: drilling a plurality of rows of fixing holes on the wall of the strongly weathered argillaceous sandstone layer by using an anchor rod drilling machine, wherein fixing rods are arranged in the fixing holes, the fixing rods are made of deformed steel bars, waterproof concrete is injected into the positioning holes by using a high-pressure grouting machine, and the ends of the fixing rods are connected in a reinforced mode by using reinforcing steel bars in the horizontal direction;
step three: after the injected waterproof concrete is initially set, paving a reinforcing mesh on the wall of the strongly weathered argillaceous sandstone layer and spraying the waterproof concrete to manufacture a waterproof protective layer;
step four: laying a layer of waterproof cloth on the outer side of the waterproof protective layer, and fixing the waterproof cloth by screwing a nut and a fixing rod;
step five: arranging a water drainage hole at the bottom of the pebble layer and above an interface with the strongly weathered argillaceous sandstone layer, filling gravel stones into the water drainage hole, inserting a water drainage pipe, and reserving the water drainage pipe with a certain length outside the foundation pit wall;
step six: the drainage ditch and the water collecting well are arranged at the bottom of the foundation pit, so that water flowing out of the drain pipe flows into the water collecting well through the drainage ditch, is pumped to the ground sedimentation tank by using a water pump, and is discharged to the outside of a construction site.
2. The method for treating water infiltration of strongly weathered argillaceous sandstone formations of deep foundation pit engineering according to claim 1, characterized in that: the early strength agent and the accelerator are added into the waterproof concrete.
3. The method for treating water infiltration of strongly weathered argillaceous sandstone formations of deep foundation pit engineering according to claim 1, characterized in that: the body of the water drain pipe in the water drain hole is fully perforated with the flower holes, and the outer wall of the water drain pipe is wrapped by dense mesh cloth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210983954.3A CN115198766A (en) | 2022-08-17 | 2022-08-17 | Method for treating water permeation of strongly weathered argillaceous sandstone layer in deep foundation pit engineering |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210983954.3A CN115198766A (en) | 2022-08-17 | 2022-08-17 | Method for treating water permeation of strongly weathered argillaceous sandstone layer in deep foundation pit engineering |
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| CN115198766A true CN115198766A (en) | 2022-10-18 |
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| CN202210983954.3A Pending CN115198766A (en) | 2022-08-17 | 2022-08-17 | Method for treating water permeation of strongly weathered argillaceous sandstone layer in deep foundation pit engineering |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090038405A (en) * | 2009-03-16 | 2009-04-20 | 장신찬 | Structure of collecting water from river bank filtration in base rock layer and method of constructing same |
| CN105155550A (en) * | 2015-07-23 | 2015-12-16 | 甘肃第六建设集团股份有限公司 | Construction method for digging deep foundation pit in large-thickness highly weathered sandstone stratum in combined supporting mode |
| CN208039281U (en) * | 2018-04-11 | 2018-11-02 | 王金宁 | A kind of novel Slope Supporting of Deep Excavation structure |
| CN108824466A (en) * | 2018-06-02 | 2018-11-16 | 北京泽通水务建设有限公司 | A kind of foundation pit side-wall water burst gushes the processing method of sand |
| CN211816267U (en) * | 2019-12-12 | 2020-10-30 | 浙江鸿翔建设集团股份有限公司 | Deep foundation pit support structure |
| CN112726643A (en) * | 2020-12-31 | 2021-04-30 | 瑞腾基础工程技术（北京）股份有限公司 | Waterproof construction suitable for green assembled soil nail wall |
| CN213233488U (en) * | 2020-09-08 | 2021-05-18 | 中建二局第二建筑工程有限公司 | High-energy-efficiency drainage type foundation pit supporting structure |
| CN214993917U (en) * | 2021-05-24 | 2021-12-03 | 瑞腾基础工程技术（北京）股份有限公司 | Assembled protective surface layer suitable for completely weathered argillaceous sandstone |
-
2022
- 2022-08-17 CN CN202210983954.3A patent/CN115198766A/en active Pending
Patent Citations (8)
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| KR20090038405A (en) * | 2009-03-16 | 2009-04-20 | 장신찬 | Structure of collecting water from river bank filtration in base rock layer and method of constructing same |
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| CN208039281U (en) * | 2018-04-11 | 2018-11-02 | 王金宁 | A kind of novel Slope Supporting of Deep Excavation structure |
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| CN112726643A (en) * | 2020-12-31 | 2021-04-30 | 瑞腾基础工程技术（北京）股份有限公司 | Waterproof construction suitable for green assembled soil nail wall |
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