CN110593279B - Foundation pit slope support control method for weak-permeability soil - Google Patents
Foundation pit slope support control method for weak-permeability soil Download PDFInfo
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- CN110593279B CN110593279B CN201910780983.8A CN201910780983A CN110593279B CN 110593279 B CN110593279 B CN 110593279B CN 201910780983 A CN201910780983 A CN 201910780983A CN 110593279 B CN110593279 B CN 110593279B
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- foundation pit
- side slope
- inclined anchor
- pipe
- slope
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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
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
Abstract
The invention discloses a foundation pit slope support control method for weak-permeability soil, and belongs to the technical field of matching of weak-permeability soil underground structures. After excavation of the foundation pit side slope is finished according to design requirements, inclined anchor rods are used for drilling into the foundation pit side slope, the included angle between each inclined anchor rod and the horizontal plane is 10-25 degrees, the length of each anchor rod is determined according to the design requirements, the anchor rods are arranged at equal intervals in a quincunx mode, a drain pipe is horizontally drilled between the inclined anchor rods at the lowest row of the foundation pit side slope, the intervals are equal to the inclined anchor rods, and the inclined anchor rods are arranged in an alternating; laying steel wire mesh sheets on the side slope surface layer of the foundation pit, and firmly welding the steel wire mesh sheets with the anchor rods; spraying fine stone concrete on the steel wire mesh sheets, and injecting high-strength cement mortar into the inclined anchor rod; a foundation pit open trench is arranged at the bottom of the foundation pit side slope, and a safety protection guardrail is arranged at the top of the foundation pit side slope. The method can effectively control the quality of the whole process of slope construction of the soil deep foundation pit with weak permeability, and the slope stability is not influenced by the damage of the slope support quality caused by the slow permeation of underground water after the forming, thereby preventing potential safety hazards.
Description
Technical Field
The invention belongs to the technical field of matching of weak-permeability soil underground structures, and particularly relates to a foundation pit slope support control method for weak-permeability soil.
Background
At present, along with the development of economy, residents live more and more intensively, and then the cell scale is formed to be larger and larger, high-rise buildings are increased increasingly, in order to meet the requirements of use functions, one or more layers of basements (civil air defense projects or basements) are generally arranged, and in the construction process of the basements, the safety of foundation pit side slopes directly concerns the lives of construction workers, and the image and the development of enterprises are also directly influenced.
In the practice of foundation pit slope support construction of weak-permeability soil, in order to prevent the influence of slow permeation of underground water on the foundation pit slope and ensure the construction quality of the foundation pit slope and the stability of the later-stage foundation pit slope, the number of the encrypted anchor rods and the mesh size of the steel wire mesh are generally adopted during foundation pit slope support, and the strength of foundation pit slope protection slurry is improved. However, due to the slow infiltration of groundwater, the prior art measures can only satisfy the stability of the foundation pit side slope in a short time, and cannot ensure the long-term safety of the foundation pit side slope.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a foundation pit side slope support control method for weak-permeability soil, which can effectively control the whole process quality of deep foundation pit side slope construction of the weak-permeability soil, does not damage the side slope support quality due to slow permeation of underground water after forming so as not to influence the stability of the side slope, prevents potential safety hazards, and further ensures the construction safety of a deep foundation pit basement and a structure thereof of the weak-permeability soil.
In order to achieve the purpose, the invention adopts the following scheme:
a foundation pit slope support control method of weak permeability soil comprises the following steps:
firstly, after excavation of a foundation pit side slope is finished according to design requirements, drilling inclined anchor rods into the foundation pit side slope, determining the length of each inclined anchor rod according to the design requirements, arranging the inclined anchor rods in a quincunx manner at intervals of 1000-1500 mm, horizontally drilling drain pipes between the lowest row of inclined anchor rods of the foundation pit side slope, setting the intervals of the drain pipes to be the same as the intervals of the inclined anchor rods, and arranging the drain pipes and the inclined anchor rods in an alternating manner;
secondly, laying a steel wire mesh on the side slope layer of the foundation pit, and welding and fixing the steel wire mesh with the inclined anchor rod and the drain pipe;
thirdly, spraying fine stone concrete with the thickness of 60-80 mm on the steel wire mesh sheets, and injecting high-strength cement mortar into the inclined anchor rods;
and fourthly, arranging a foundation pit open trench at the bottom of the foundation pit side slope, and arranging a safety protection railing at the top of the foundation pit side slope.
Furthermore, the included angle between the inclined anchor rod and the horizontal plane is 10-25 degrees.
Further, the inclined anchor rod and the horizontal plane form an included angle of 20 degrees.
Further, the slope stock includes that a plurality of cup joints the concatenation pipe of connection, every the concatenation pipe includes big port and port, connect the elastic pressing block subassembly on one side end of the big port of concatenation pipe, the guide way has been seted up on the inner wall of concatenation pipe, the through-hole has been seted up in the guide way, a fixedly connected with resistance plate in the through-hole, the resistance plate is close to the one end and the concatenation pipe fixed connection of the port of concatenation pipe, the inner wall and the guide way of resistance plate flush, the one end that the resistance plate is close to the big port of concatenation pipe is the free end.
Further, the elastic pressing block assembly comprises a positioning plate, a pressing plate and a clamping plate, the positioning plate is fixedly connected to the inner wall of the splicing pipe close to the foundation pit side slope, a spring is fixedly connected to the positioning plate, one side of the spring away from the positioning plate is fixedly connected with the pressing plate, the pressing plate is fixedly connected to the clamping plate and located on the inner side of the splicing pipe, one end of the clamping plate is of a wedge-shaped structure, and the wedge-shaped structure penetrates through the inner wall of the splicing pipe and extends into a guide groove in the inner wall of the splicing pipe on the outer side.
Furthermore, the guide grooves and the pressing plates on the same splicing pipe are arranged alternately.
Further, in step one, when the inclined anchor rod drills into a foundation pit side slope, a plurality of splicing pipes are firstly sleeved and assembled into a cylindrical structure, then the splicing pipes on the outermost side drill into the foundation pit side slope, a pressing plate of the splicing pipes on the inner side of the inclined anchor rod moves to the through hole to extrude the resistance plate along the guide groove of the splicing pipes on the outermost side, the free ends of the resistance plates are forced to expand outwards to lock the splicing pipes on the outermost side, and the process is repeated until the splicing pipes on the outer side of the inclined anchor rod are locked by the splicing pipes on the innermost side.
Compared with the prior art, the invention can obtain the following technical effects:
1. the steel wire mesh sheet fixing device is provided with the inclined anchor rods and the water discharge pipes which are welded and fixed with the steel wire mesh sheet, the inclined anchor rods and the water discharge pipes are alternately arranged at the same interval, and the inclined anchor rods are arranged in a plum blossom shape, so that the fixing and supporting effects of the steel wire mesh sheet are enhanced. The included angle of the inclined anchor rod and the horizontal plane is set to be 10-25 degrees, so that the tensile strength of the inclined anchor rod is improved, meanwhile, the drain pipe conducts efficient drainage, the construction quality of the foundation pit side slope and the stability and the safety of the later stage are further guaranteed, and finally the construction safety of the deep foundation pit basement and the structures of the deep foundation pit basement which guarantee the weak permeability soil is achieved.
2. The inclined anchor rod is a splicing pipe formed by multiple sections of sleeved connection, and a guide groove, an elastic pressing block assembly, a through hole and a resistance plate in the through hole are formed in the splicing pipe. The inboard concatenation pipe utilizes elastic pressing block subassembly to remove and remove to through-hole department and will outwards extrude the resistance plate and make its anchor in the inside of foundation ditch side slope, makes its further reinforcing slope stock and foundation ditch side slope's joint strength, and then further ensures the stability and the safety in utilization of later stage foundation ditch side slope.
3. The elastic pressing block assembly comprises a pressing plate, a clamping plate, a positioning plate and a spring on the positioning plate, when the pressing plate moves to the through hole, the spring pushes the pressing plate outwards to push the clamping plate outwards, when the splicing pipe continues to be drilled into the clamping plate, the wedge-shaped structure of the clamping plate exerts resistance on the resistance plate to further anchor the resistance plate outwards in an expanding mode, and springback is prevented from occurring under the resistance action when the splicing pipe is drilled into the splicing pipe.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a plan view of the overall structure of the present invention;
FIG. 3 is a longitudinal cross-sectional view of a splice tube of the present invention;
fig. 4 is a transverse cross-sectional view of a spliced tube of the present invention.
In the figure: 1. foundation pit side slope; 2. inclining the anchor rod; 21. splicing the tubes; 211. a guide groove; 212. a through hole; 213. a resistance plate; 22. an elastic press block assembly; 221. positioning a plate; 222. pressing a plate; 223. clamping a plate; 224. a spring; 3. a drain pipe; 4. a steel wire mesh sheet; 5. fine stone concrete; 6. a foundation pit open trench; 7. safety protection railing.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
as shown in fig. 1 to 2, a method for controlling a foundation pit slope support of weak permeability soil comprises the following steps:
firstly, after excavation of a foundation pit side slope 1 is finished according to design requirements, drilling an inclined anchor rod 2 into the foundation pit side slope 1, wherein the included angle between the inclined anchor rod 2 and the horizontal plane is 20 degrees, and the inclined anchor rod 2 can be more effectively fixed in the foundation pit side slope 1 by utilizing the included angle, so that the influence of deviation or later-stage water seepage and sliding on construction quality is prevented; the length of the inclined anchor rods 2 is determined according to design requirements, the inclined anchor rods 2 are arranged in a quincunx mode at intervals of 1500mm, drain pipes 3 are horizontally drilled between the lowest row of inclined anchor rods 2 of the foundation pit side slope 1, metal filter screens are arranged on the outer walls of the drain pipes 3, the drain pipes 3 can ensure structural support of the steel wire mesh sheets 4 while draining water, and the intervals of the drain pipes 3 are the same as the intervals of the inclined anchor rods 2 and are arranged in an alternating mode with the inclined anchor rods 2;
secondly, laying a steel wire mesh 4 on the surface layer of the foundation pit side slope 1, welding and fixing the steel wire mesh 4 with the inclined anchor rod 2 and the drain pipe 3, and fixing and supporting the steel wire mesh 4 to a certain height by using the inclined anchor rod 2 and the drain pipe 3;
thirdly, spraying fine stone concrete 5 with the thickness of 80mm on the steel wire mesh sheet 4, injecting high-strength cement mortar into the inclined anchor rod 2, reinforcing the fine stone concrete 5 by using the steel wire mesh sheet 4, and effectively fixing and supporting the foundation pit side slope 1 by combining the inclined anchor rod 2 and the drain pipe 3;
and fourthly, arranging a foundation pit open trench 6 at the bottom of the foundation pit side slope 1, and arranging a safety protection railing 7 at the top of the foundation pit side slope 1.
Example 2:
as shown in fig. 3 to 4, based on embodiment 1, a further preferable scheme is that the inclined anchor rod 2 includes a plurality of splicing pipes 21 connected in a sleeved manner, each splicing pipe 21 includes a large port and a small port, one side end of the large port of the splicing pipe 21 is connected with an elastic pressing block assembly 22, a guide groove 211 is formed in the inner wall of the splicing pipe 21, a through hole 212 is formed in the guide groove 211, a resistance plate 213 is fixedly connected in the through hole 212, one end of the resistance plate 213, which is close to the small port of the splicing pipe 21, is welded and fixed to the splicing pipe 21, the inner wall of the resistance plate 213 is flush with the guide groove 211, one end of the resistance plate 213, which is close to the large port of the splicing pipe 21, is a free end, the elastic pressing block assembly 22 is moved to the through hole 212 along the guide groove 211, the elastic pressing block assembly 22 pushes the resistance plate 213 to extend outward to lock the splicing pipe 21 outside the elastic pressing block assembly 22, and further enhances the combination between the splicing pipe 21 and the.
Further preferred scheme on the basis of this embodiment, elastic pressing block assembly 22 includes locating plate 221, clamp plate 222 and cardboard 223, locating plate 221 welded fastening is on the inner wall of splicing pipe 21 that is close to foundation ditch side slope 1, two springs 224 of fixedly connected with on the locating plate 221, one side that locating plate 221 was kept away from to two springs 224 respectively with the clamp plate 222 welded fastening that corresponds, clamp plate 222 welded fastening is on cardboard 223 and is located the inboard of splicing pipe 21, the one end of cardboard 223 is the wedge structure, the wedge structure runs through splicing pipe 21's inner wall and extends to in the guide way 211 on the outer side splicing pipe 21 inner wall, the size of wedge structure slightly is less than the size of through-hole 212. Locating plate 221 protects whole elastic press block assembly 22 and provides the bottom sprag for spring 224 simultaneously, when cardboard 223 removed to through-hole 212 department in guide way 211, spring 224 will outwards promote clamp plate 222 and then push away cardboard 223 to through-hole 212 in, continue to promote cardboard 223 and make its resistance board 213 realize the outer expansion then realize the effect of reinforcing resistance.
The guide grooves 211 and the pressing plates 222 on the same splicing pipe 21 are arranged alternately, so that the interference phenomenon between the guide grooves 211 and the clamping plates 223 is prevented.
Example 3:
in the first step, when the inclined anchor rod 2 drills into the foundation pit side slope 1, the splicing pipes 21 are sleeved and assembled into a cylindrical structure, then the outermost splicing pipe 21 drills into the foundation pit side slope 1, the pressing plate 222 of the inner splicing pipe 21 moves to the through hole 212 along the guide groove 211 of the outermost splicing pipe 21 to press the resistance plate 213, the free end of the resistance plate 213 is forced to expand outwards to lock the outermost splicing pipe 21, and the rest is done until the innermost splicing pipe 21 locks the outer splicing pipe 21, so that the construction quality, the later stability and the safety of the foundation pit side slope are guaranteed, and finally the construction safety of the deep foundation pit and the basement structure of the weak-permeability soil is guaranteed.
In the foundation pit side slope construction process, the inclined anchor rods and the drain pipes at equal intervals are welded and fixed with the steel wire mesh to reduce the influence of later-stage slow water seepage on the foundation pit side slope, ensure the construction quality, the later-stage stability and the safety of the foundation pit side slope, finally reach the construction safety of the deep foundation pit basement and the structures thereof which guarantee the weak permeability soil, reduce the engineering cost, eliminate the later-stage maintenance cost and obtain good social reputation.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A foundation pit slope support control method of weak permeability soil is characterized by comprising the following steps:
firstly, after excavation of a foundation pit side slope (1) is finished according to design requirements, drilling inclined anchor rods (2) into the foundation pit side slope (1), determining the length of the inclined anchor rods (2) according to the design requirements, arranging the inclined anchor rods in a quincunx mode according to the distance of 1000-1500 mm, horizontally drilling drain pipes (3) between the lowest row of inclined anchor rods (2) of the foundation pit side slope (1), setting the distance of the drain pipes (3) to be the same as the distance of the inclined anchor rods (2) and arranging the drain pipes (3) in an alternating mode with the inclined anchor rods (2);
secondly, laying a steel wire mesh (4) on the surface layer of the foundation pit side slope (1), and welding and fixing the steel wire mesh with the inclined anchor rod (2) and the drain pipe (3);
thirdly, spraying fine aggregate concrete (5) with the thickness of 60-80 mm on the steel wire mesh (4), and injecting high-strength cement mortar into the inclined anchor rod (2);
fourthly, a foundation pit open trench (6) is formed in the bottom of the foundation pit side slope (1), and a safety protection railing (7) is arranged at the top of the foundation pit side slope (1);
the inclined anchor rod (2) comprises a plurality of splicing pipes (21) which are connected in a sleeved mode, each splicing pipe (21) comprises a large port and a small port, one side end of the large port of each splicing pipe (21) is connected with an elastic pressing block assembly (22), the inner wall of each splicing pipe (21) is provided with a guide groove (211), a through hole (212) is formed in each guide groove (211), a resistance plate (213) is fixedly connected in each through hole (212), one end, close to the small port of each splicing pipe (21), of each resistance plate (213) is fixedly connected with each splicing pipe (21), the inner wall of each resistance plate (213) is flush with each guide groove (211), and one end, close to the large port of each splicing pipe (21), of each resistance plate (213) is a free end;
elastic pressing block subassembly (22) includes locating plate (221), clamp plate (222) and cardboard (223), locating plate (221) fixed connection is on the inner wall of concatenation pipe (21) that is close to foundation ditch side slope (1), fixedly connected with spring (224) on locating plate (221), one side and clamp plate (222) fixed connection of locating plate (221) are kept away from in spring (224), clamp plate (222) fixed connection just is located the inboard of concatenation pipe (21) on cardboard (223), the one end of cardboard (223) is the wedge structure, the wedge structure runs through the inner wall of concatenation pipe (21) and extends to in guide way (211) on the outside concatenation pipe (21) inner wall.
2. The foundation pit slope support control method of weak permeability soil according to claim 1, characterized in that the included angle between the inclined anchor rod (2) and the horizontal plane is 10-25 °.
3. The foundation pit slope support control method of weak permeability soil according to claim 2, characterized in that the angle between the inclined anchor rod (2) and the horizontal plane is 20 °.
4. The method for controlling the foundation pit slope support of the weak permeability soil according to the claim 1, wherein the guide grooves (211) and the pressing plates (222) on the same splicing pipe (21) are arranged alternately.
5. The foundation pit side slope support control method for the weak permeability soil according to claim 4, wherein in the step one, when the inclined anchor rod (2) drills into the foundation pit side slope (1), firstly, the splicing pipes (21) are sleeved and assembled into a cylindrical structure, then, the outermost splicing pipe (21) drills into the foundation pit side slope (1), the pressing plate (222) of the splicing pipe (21) on the inner side of the inclined anchor rod moves to the through hole (212) along the guide groove (211) of the outermost splicing pipe (21) to press the resistance plate (213), the free end of the resistance plate (213) is forced to expand outwards to lock the outermost splicing pipe (21), and the process is repeated until the innermost splicing pipe (21) locks the outer splicing pipe (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910780983.8A CN110593279B (en) | 2019-08-23 | 2019-08-23 | Foundation pit slope support control method for weak-permeability soil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910780983.8A CN110593279B (en) | 2019-08-23 | 2019-08-23 | Foundation pit slope support control method for weak-permeability soil |
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| Publication Number | Publication Date |
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| CN110593279A CN110593279A (en) | 2019-12-20 |
| CN110593279B true CN110593279B (en) | 2020-11-03 |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080096629A (en) * | 2007-04-28 | 2008-10-31 | 주식회사 오륙개발 | Puzzle type block reinforcement method |
| CN103195061B (en) * | 2013-04-07 | 2015-05-06 | 浙江华东建设工程有限公司 | Multi-functional casing pipe part and anchor rod construction method using same |
| CN208136927U (en) * | 2018-03-19 | 2018-11-23 | 中建三局基础设施建设投资有限公司 | A kind of soil cutting side slope supporting construction |
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