CN115182358A - Microbial double-row pile foundation pit supporting structure - Google Patents
Microbial double-row pile foundation pit supporting structure Download PDFInfo
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- CN115182358A CN115182358A CN202210840436.6A CN202210840436A CN115182358A CN 115182358 A CN115182358 A CN 115182358A CN 202210840436 A CN202210840436 A CN 202210840436A CN 115182358 A CN115182358 A CN 115182358A
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- row pile
- grouting
- wall
- microbial
- pile wall
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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
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- 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
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- 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
- E02D5/20—Bulkheads or similar walls made of prefabricated parts and concrete, including reinforced concrete, in situ
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- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a microbial double-row pile foundation pit supporting structure which mainly comprises a front row pile wall, a rear row pile wall and a microbial sand wall filled between the front row pile wall and the rear row pile wall; the microorganism sand wall comprises soil, a grouting pipe, a grouting box and slurry; the plurality of grouting boxes are arranged on the grouting pipe at intervals along the axial line of the grouting pipe and are communicated with the grouting pipe; the bottom of the grouting box is provided with a grout outlet; the grouting pipe and the grouting box are arranged in the soil in a pre-buried mode; and after the grout is injected into the grouting pipe from the outside, the grout permeates into soil through the grouting box, so that the microbial sand wall is formed. According to the scheme, the microbial induced calcium carbonate technology is utilized, sand pile wall reinforcing construction is carried out after the construction of the double-row pile wall is completed, so that the stress on the top and the bottom between the front-row pile wall and the rear-row pile wall can be uniform, and the strength and the support performance of the double-row pile wall are effectively improved. The invention also has the advantages of simple structure, convenient operation and easy implementation.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a microbial double-row pile foundation pit supporting structure.
Background
In the foundation pit supporting engineering, double-row pile walls are commonly used supporting modes such as foundation pits. However, the traditional connection method between the double rows of pile walls is only the connection through the pile top crown beams, and the connection is a 'door type' connection, namely, the connection is only the top end, and the middle part and the bottom part of the connection are not connected. The connection relationship between pile walls is directly unstable; between two rows of pile walls, can directly lead to top crown beam fracture or pile wall bottom to warp when its bottom atress is greater than upper portion atress, has very big potential safety hazard.
In order to solve the unstable problem of the connection relation of the double rows of piles in the prior art, between the two rows of pile walls, when the stress of the bottom of the pile walls is greater than that of the upper part of the pile walls, the top crown beam is directly fractured or the bottom of the pile wall is deformed, so that great potential safety hazards exist. Therefore, further improvements and improvements are needed in the art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a microbial double-row pile foundation pit supporting structure.
The purpose of the invention is realized by the following technical scheme:
a microbial double-row pile foundation pit supporting structure mainly comprises a front row pile wall, a rear row pile wall and a microbial sand wall filled between the front row pile wall and the rear row pile wall. The microbial sand wall comprises soil, a grouting pipe, a grouting box and grout. And the plurality of grouting boxes are arranged on the grouting pipe at intervals along the axis of the grouting pipe and are communicated with the grouting pipe. And a grout outlet is formed in the bottom of the grouting box. The grouting pipe and the grouting box are arranged in the soil in a pre-buried mode. And after the grout is injected into the grouting pipe from the outside, the grout permeates into soil through the grouting box, so that the microbial sand wall is formed.
As a preferable scheme of the invention, the top of the grouting box is also provided with a grout outlet. This allows the slurry to be delivered to the top soil of the slip box, allowing for efficient calcium carbonate formation between more sand grains, resulting in a strong microbial sand wall.
As a preferable scheme of the invention, the side surface of the grouting box is also provided with a grout outlet. This allows the slurry to be delivered to the soil on the sides of the grouting box, allowing efficient calcium carbonate formation between more sand grains, resulting in a strong microbial sand wall.
Furthermore, because the field grouting process is long, the bottom of the grouting pipe is soaked in the bacterial liquid and the nutrient solution for a long time, calcium carbonate precipitates are easily generated in the pipe, the grouting pipe is blocked, and the strength of a sand wall is insufficient, so that the phenomenon is avoided as much as possible. The grouting box is also provided with a one-way valve. The check valve is installed on the grout outlet.
In order to further enhance the supporting strength of the front row pile wall, a steel plate is further arranged in the front row pile wall. The steel plate is vertically arranged and adopts an I-shaped structural design.
In order to further enhance the supporting strength of the rear row pile wall, a steel plate is also arranged in the rear row pile wall. The steel plate is vertically arranged and adopts an I-shaped structural design.
In a preferred embodiment of the present invention, the slurry includes a bacterial solution and a cementing solution.
As a preferable scheme of the invention, in order to enable the slurry to permeate into more soil, the grouting pipes are arranged in the soil at intervals in a quincunx manner.
Furthermore, in order to enhance the supporting strength between the front row pile wall and the rear row pile wall, the foundation pit supporting structure further comprises a connecting component for connecting and supporting the front row pile wall and the rear row pile wall. One end of the connecting component is fixed with the front row of pile walls, and the other end of the connecting component is fixed with the rear row of pile walls.
As a preferable aspect of the present invention, in order to further strengthen the support between the front row pile wall and the rear row pile wall, the connecting members of the present invention are installed side by side between the front row pile wall and the rear row pile wall. The connecting component adopts profile steel or an anchor cable.
The working process and principle of the invention are as follows: according to the scheme, the microorganism induced calcium carbonate technology is utilized, sand pile wall reinforcing construction is carried out after double-row pile wall construction is completed, top and bottom stress between the front row pile wall and the rear row pile wall can be uniform, the problem that when the traditional double-row pile wall supports the double-row pile wall in a foundation pit, the top stress of the front row pile wall and the top stress of the rear row pile wall are very easily smaller than the bottom stress due to the fact that the property of the transmission force between the pile top crown beam and the pile soil is different, the supporting force is enabled to be in the transmission process, and the phenomenon that the front row pile wall is broken at the waist is very easily caused, and therefore the strength and the supporting performance of the double-row pile wall are effectively improved. The invention also has the advantages of simple structure, convenient operation and easy implementation.
Compared with the prior art, the invention also has the following advantages:
(1) The microbial double-row pile foundation pit supporting structure provided by the invention is reinforced in a sandy soil stratum by utilizing a green microbial induced calcium carbonate technology, and is connected with double rows of piles to form a stable rigid structure.
(2) The microbial double-row pile foundation pit supporting structure provided by the invention can effectively transfer supporting force, and the defect that the supporting force is transferred only from the top end and soil between piles is overcome.
(3) The microbial double-row pile foundation pit supporting structure provided by the invention can reduce the possibility of blockage in the grouting process by utilizing the structure and the principle of the grouting box in the microbial pile wall forming process and the optimized grouting stage, so that slurry can permeate into more soil, and the strength and the support of a microbial sand wall are effectively improved.
Drawings
Fig. 1 is a top view of a microbial double-row pile foundation pit supporting structure provided by the invention.
Fig. 2 is a partial sectional view of a microbial double-row pile foundation pit supporting structure provided by the invention.
Fig. 3 is a side sectional view of a microbial double row pile foundation pit supporting structure provided by the invention.
Fig. 4 is a bottom view of the grouting box provided in the present invention.
The reference numbers in the above figures illustrate:
1-front row pile wall, 2-rear row pile wall, 3-microbial sand wall, 4-soil, 5-grouting pipe, 6-grouting box, 7-one-way valve, 8-steel plate and 9-connecting component.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described below with reference to the accompanying drawings and examples.
Example 1:
as shown in fig. 1 to 4, the present embodiment discloses a microbial double-row pile foundation pit supporting structure, which mainly includes a front row pile wall 1, a rear row pile wall 2, and a microbial sand wall 3 filled between the front row pile wall 1 and the rear row pile wall 2. The microorganism sand wall 3 comprises soil 4, a grouting pipe 5, a grouting box 6 and grout. And a plurality of grouting boxes 6 are arranged on the grouting pipe 5 at intervals along the axis of the grouting pipe 5 and are communicated with the grouting pipe 5. And a grout outlet is formed in the bottom of the grouting box 6. The grouting pipe 5 and the grouting box 6 are arranged in the soil 4 in a pre-buried mode. The grout is injected into the grouting pipe 5 from the outside and then permeates into the soil 4 through the grouting box 6, so that the microbial sand wall 3 is formed.
As a preferable scheme of the invention, the top of the grouting box 6 is also provided with a grout outlet. This allows the slurry to be delivered to the top soil 4 of the slip box 6, allowing efficient calcium carbonate formation between more sand grains, resulting in a strong microbial sand wall 3.
As a preferable scheme of the present invention, a grout outlet is also provided on the side surface of the grouting box 6. This allows the slurry to be delivered to the soil 4 at the side of the slip box 6, allowing efficient calcium carbonate formation between more sand grains, thus forming a strong microbial sand wall 3.
Furthermore, because the field grouting process is long, the bottom of the grouting pipe 5 is soaked in the bacterial liquid and the nutrient solution for a long time, calcium carbonate precipitation is easily generated in the pipe, so that the grouting pipe 5 is blocked, the strength of a sand wall is insufficient, and the phenomenon is avoided as much as possible. The grouting box 6 is also provided with a one-way valve 7. The one-way valve 7 is arranged on the grout outlet.
In order to further enhance the supporting strength of the front row pile wall 1, a steel plate 8 is further provided in the front row pile wall 1. The steel plate 8 is vertically arranged and adopts an I-shaped structural design.
In order to further enhance the supporting strength of the rear row pile wall 2, a steel plate 8 is also provided in the rear row pile wall 2 according to the preferred embodiment of the present invention. The steel plate 8 is vertically arranged and adopts an I-shaped structural design.
In a preferred embodiment of the present invention, the slurry includes a bacterial solution and a cementing solution.
As a preferred scheme of the present invention, in order to allow the slurry to penetrate more soil 4, the grouting pipes 5 of the present invention are arranged at quincunx intervals in the soil 4.
Further, in order to reinforce the supporting strength between the front row pile wall 1 and the rear row pile wall 2, the foundation pit supporting structure of the invention further comprises a connecting member 9 for connecting and supporting the front row pile wall 1 and the rear row pile wall 2. One end of the connecting component 9 is fixed with the front row pile wall 1, and the other end is fixed with the rear row pile wall 2.
As a preferable aspect of the present invention, in order to further strengthen the support between the front row pile wall 1 and the rear row pile wall 2, the connection members 9 of the present invention are installed side by side between the front row pile wall 1 and the rear row pile wall 2. The connecting member 9 is made of profile steel or an anchor cable.
The working process and principle of the invention are as follows: according to the scheme, the microbial induced calcium carbonate technology is utilized, sand pile wall reinforcing construction is carried out after double-row pile wall construction is completed, top and bottom stress between the front row pile wall 1 and the rear row pile wall 2 can be uniform, and the problem that when the traditional double-row pile wall supports the double-row pile wall in a foundation pit, the phenomenon that the front row pile wall 1 is broken at the waist is easily caused due to the fact that the top stress of the front row pile wall 1 and the rear row pile wall 2 is smaller than the bottom stress in the transmission process of supporting force due to the fact that the nature of the transmission force of soil between the pile top crown beam and the pile is different is avoided, and therefore the strength and the supporting performance of the double-row pile wall are effectively improved. The invention also has the advantages of simple structure, convenient operation and easy implementation.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such modifications are intended to be included in the scope of the present invention.
Claims (10)
1. A microbial double-row pile foundation pit supporting structure is characterized by comprising a front row pile wall, a rear row pile wall and a microbial sand wall filled between the front row pile wall and the rear row pile wall; the microorganism sand wall comprises soil, a grouting pipe, a grouting box and slurry; the plurality of grouting boxes are arranged on the grouting pipe at intervals along the axial line of the grouting pipe and are communicated with the grouting pipe; the bottom of the grouting box is provided with a grout outlet; the grouting pipe and the grouting box are arranged in the soil in a pre-buried mode; and after the grout is injected into the grouting pipe from the outside, the grout permeates into soil through the grouting box, so that the microbial sand wall is formed.
2. The microbial double row pile foundation pit supporting structure of claim 1, wherein the top of the grouting box is also provided with a grout outlet.
3. The microbial double row pile foundation pit supporting structure of claim 1, wherein the side of the grouting box is also provided with a grout outlet.
4. The microbial double-row pile foundation pit supporting structure according to claim 2 or 3, wherein a one-way valve is further arranged on the grouting box; the check valve is installed on the grout outlet.
5. The microbial double row pile foundation pit supporting structure of claim 1, wherein a steel plate is further arranged in the front row pile wall; the steel plate is vertically arranged and adopts an I-shaped structural design.
6. The microbial double-row pile foundation pit supporting structure of claim 1, wherein a steel plate is also arranged in the back row pile wall; the steel plate is vertically arranged and adopts an I-shaped structural design.
7. The microbial double row pile foundation pit supporting structure of claim 1, wherein the grout comprises a bacterial liquid and a cementing liquid.
8. The microbial double row pile foundation pit supporting structure of claim 1, wherein the grout pipes are arranged at quincunx intervals in the soil.
9. The microbial double-row pile foundation pit supporting structure of claim 1, further comprising a connecting member for connecting and supporting the front row pile wall and the rear row pile wall; one end of the connecting component is fixed with the front row of pile walls, and the other end of the connecting component is fixed with the rear row of pile walls.
10. The microbial double row pile foundation pit supporting structure of claim 9, wherein the connecting members are installed side by side between the front row pile walls and the rear row pile walls; the connecting component adopts profile steel or an anchor cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210840436.6A CN115182358A (en) | 2022-07-15 | 2022-07-15 | Microbial double-row pile foundation pit supporting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210840436.6A CN115182358A (en) | 2022-07-15 | 2022-07-15 | Microbial double-row pile foundation pit supporting structure |
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| Publication Number | Publication Date |
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| CN115182358A true CN115182358A (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210840436.6A Pending CN115182358A (en) | 2022-07-15 | 2022-07-15 | Microbial double-row pile foundation pit supporting structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116163318A (en) * | 2023-04-25 | 2023-05-26 | 广州地铁设计研究院股份有限公司 | Construction method and structure for foundation pit support of inserted section steel microorganism sand wall |
-
2022
- 2022-07-15 CN CN202210840436.6A patent/CN115182358A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116163318A (en) * | 2023-04-25 | 2023-05-26 | 广州地铁设计研究院股份有限公司 | Construction method and structure for foundation pit support of inserted section steel microorganism sand wall |
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Effective date of registration: 20221226 Address after: 511400 No. 2, west of Gongye 4th Road, mingzhuwan starting area, Nansha District, Guangzhou City, Guangdong Province (only for office use) (self declaration) (MZ) Applicant after: CHINA RAILWAY TUNNEL GROUP Co.,Ltd. Applicant after: GUANGZHOU MUNICIPAL ENGINEERING DESIGN & RESEARCH INSTITUTE Co.,Ltd. Applicant after: GUANGDONG University OF TECHNOLOGY Address before: No. 33, Nanshan District construction village, Shenzhen, Guangdong Province Applicant before: SANCHU CO., LTD. OF CHINA RAILWAY TUNNEL Group Applicant before: GUANGZHOU MUNICIPAL ENGINEERING DESIGN & RESEARCH INSTITUTE Co.,Ltd. Applicant before: GUANGDONG University OF TECHNOLOGY |
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