CN110984244A - Method for eliminating pile foundation soil squeezing effect through flexible energy absorption belt - Google Patents
Method for eliminating pile foundation soil squeezing effect through flexible energy absorption belt Download PDFInfo
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- CN110984244A CN110984244A CN201911299387.4A CN201911299387A CN110984244A CN 110984244 A CN110984244 A CN 110984244A CN 201911299387 A CN201911299387 A CN 201911299387A CN 110984244 A CN110984244 A CN 110984244A
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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
- E02D31/10—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 soil pressure or hydraulic pressure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- General Life Sciences & Earth Sciences (AREA)
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- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a method for eliminating a soil squeezing effect of a pile foundation through a flexible energy absorption belt, which aims to solve the problems of low construction efficiency and narrow application range of the existing method for eliminating the soil squeezing effect. The method for eliminating the soil squeezing effect of the pile foundation through the flexible energy absorption belt comprises the following steps; setting a pile foundation construction area and dividing adjacent building areas needing to be protected; arranging a flexible energy absorption band at a position, which is 0.3-0.5 times of the distance between the pile foundation construction area and the adjacent building area, of the pile foundation construction area; determining the positions of two ends of the flexible energy absorption belt according to the pile foundation construction area; arranging a flexible micro pile position at the set flexible energy absorption belt position, and presetting the diameter and the length of a flexible micro pile; drilling a hole in the set flexible micro pile position; filling a high-consistency flexible material in a pile hole of the flexible micro pile; constructing a pile foundation in a pile foundation construction area; and after the construction of the pile foundation is finished, replacing the high-consistency flexible material in the pile hole of the flexible micro pile with portland cement.
Description
Technical Field
The invention belongs to the field of building construction, and particularly relates to a method for eliminating a pile foundation soil squeezing effect through a flexible energy absorption belt.
Background
With the increase of high-rise buildings, the pile foundation is the most widely applied high-rise building foundation form. The soil-squeezing pile type can generate a soil-squeezing effect in the construction process, namely when a soil body is saturated, the pore water pressure rises instantly, the soil body around the pile generates displacement and stress change, and further adverse effects are caused to the surrounding environment, and engineering accidents such as cracking of a nearby building, road bulging, fracture of underground pipelines and the like can be caused in serious cases, so that the construction method capable of effectively eliminating or reducing the soil-squeezing effect has very important engineering significance. The method for eliminating the soil compaction effect in the existing building engineering has the main defects that:
1. enlarging the pile distance; with the increase of the pile distance, the structure of the high-rise building needs to be adjusted adaptively, thereby increasing the engineering cost.
2. Adjusting the piling sequence; instead, the construction is carried out from the middle to the periphery or by adopting the jumping construction, but the construction efficiency is inevitably reduced no matter how to adjust the piling sequence.
3. Digging an anti-extrusion ditch; in the method, a field for implementing ditching is difficult to be arranged at the periphery of the pile, the depth of the ditching is limited, and the soil squeezing effect cannot be basically eliminated in the soft soil construction process, so that the method has a narrow application range.
4. Leading holes; the method can reduce partial soil squeezing effect by firstly taking out the center soil of the pile at the pile position by using a spiral rod drilling machine and then driving the pile, but because the center soil of the pile is taken out, the side resistance of the pile is reduced, the bearing capacity of the pile is reduced, and further the foundation strength of the building is influenced.
Disclosure of Invention
The invention aims to provide a method for eliminating the soil compaction effect of a pile foundation through a flexible energy absorption belt, and the method is used for solving the problems of low construction efficiency and narrow application range of the existing method for eliminating the soil compaction effect.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for eliminating the soil squeezing effect of a pile foundation through a flexible energy absorption belt comprises the following steps;
s1, setting a pile foundation construction area and dividing adjacent building areas needing to be protected;
s2, arranging a flexible energy absorption band at a position, which is 0.3-0.5 time of the distance between the pile foundation construction area and the area adjacent to the building, of the pile foundation construction area;
s3, determining the positions of two ends of the flexible energy absorption belt according to the pile foundation construction area;
s4, arranging a flexible micro pile position at the set flexible energy absorption belt position, and presetting the diameter and the length of the flexible micro pile;
s5, drilling holes in the pile positions of the set flexible micro piles;
s6, filling high-consistency flexible materials in the pile holes of the flexible micro piles;
s7, constructing the pile foundation in the pile foundation construction area;
and S8, after the pile foundation construction is finished, replacing the high-consistency flexible material in the pile hole of the flexible micro pile with portland cement or concrete.
Preferably, the flexible energy absorbing band in step S2 is a straight line.
Preferably, in step S3, the two ends of the flexible energy absorbing band extend to the position 0.8-1.2 times of the pile distance of the precast pile outside the pile foundation construction area.
Preferably, in step S4, the distance between adjacent flexible micro-piles is 0.5-1.0m, the diameter of the flexible micro-pile is 0.4-0.5 times the diameter of the precast pile, and the length of the flexible micro-pile is 0.7-1.2 times the length of the precast pile.
Preferably, in step S5, the flexible micropile is drilled by a full-face engineering drill.
Preferably, the high consistency flexible material is bentonite.
Preferably, the step S6 of filling the flexible micro-pile hole with the high-consistency flexible material includes inserting the end of the grouting pipe into the bottom of the flexible micro-pile hole, and then injecting the high-consistency flexible material into the flexible micro-pile hole through the grouting pipe until the flexible micro-pile hole is filled.
Preferably, the replacing of the high-consistency flexible material in the flexible micro-pile hole with portland cement or concrete in step S8 includes injecting portland cement or concrete into the flexible micro-pile hole through a grouting pipe, and floating up and flowing out of the pile hole of the flexible micro-pile during the injecting process until the portland cement or concrete floats up and flows out of the flexible micro-pile hole.
The invention has the beneficial effects that:
according to the method for eliminating the pile foundation soil squeezing effect through the flexible energy absorption band, the flexible energy absorption band consisting of a row of flexible micro piles is formed by filling the high-consistency flexible material in the pile holes of the flexible micro piles, and when the pile foundation is constructed, the excess pore water pressure generated by the pile foundation soil squeezing effect and the deformation of foundation soil are absorbed by the flexible energy absorption band, so that the safety of adjacent buildings, adjacent roads and adjacent underground pipelines is ensured; after the pile foundation construction is finished, the high-consistency flexible material in the flexible micro pile hole is replaced by portland cement, the portland cement forms a row of rigid micro pile protective belts, and the later-stage supporting and protecting effects on buildings, roads and underground pipelines can be achieved. Therefore, the method of the invention has the advantages of easy implementation, low cost and wide application range, can effectively eliminate or reduce the soil squeezing effect on various saturated and unsaturated soft and hard soil layers, and greatly improves the construction quality and the construction efficiency.
Drawings
FIG. 1 is a layout view of a compliant energy absorbing belt according to the present invention;
figure 2 is a diagram of a flexible micro-stake layout.
The reference numbers are as follows:
1-pile foundation construction area, 2-building area adjacent to the construction area, 3-flexible energy absorption band, 4-flexible micro pile and 5-precast pile.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
a method for eliminating the soil compaction effect of a pile foundation through a flexible energy absorption belt is shown in figures 1 and 2 and comprises the following steps;
s1, setting a pile foundation construction area 1 and dividing an adjacent building area 2 to be protected; the width of the pile foundation construction area 1 is 12000 mm.
S2, the distance between the pile foundation construction area 1 and the adjacent building area 2 is 7000mm, and the position of the flexible energy absorption band 3 is arranged at the position, with the distance of 22500mm, between the pile foundation construction area 1 and the adjacent building area; the flexible energy absorbing belt 3 is arranged in a straight line, and the flexible energy absorbing belt 3 is arranged in parallel with the boundary of the pile foundation construction area 1.
S3, determining the positions of two ends of the flexible energy absorbing belt 3 according to the pile foundation construction area 1; and two ends of the flexible energy absorption belt 3 extend to 1145mm outside the pile foundation construction area 1.
S4, arranging a pile position of the flexible micro pile 4 at the set position of the flexible energy absorbing belt 3, and presetting the diameter and the length of the flexible micro pile 4;
the precast pile 5 has a length of 25048mm and a diameter of 500 mm. Accordingly, the distance between adjacent flexible micro-piles 4 is 700mm, the diameter of the flexible micro-pile 4 is 200mm, the length of the flexible micro-pile 4 is 26200mm, and the number of the flexible micro-piles 4 is 22.
And S5, drilling the set pile position of the flexible micro pile 4 by a full-section engineering drilling machine.
S6, filling high-consistency flexible materials in pile holes of the flexible micro piles 4; a flexible energy absorbing strip 3 is formed consisting of an array of flexible micro-piles 4, wherein the high consistency flexible material is preferably bentonite.
The step of filling the high-consistency flexible material in the pile hole of the flexible miniature pile 4 comprises the steps of firstly inserting the end part of a grouting pipe into the bottom of the pile hole of the flexible miniature pile 4, and then filling the high-consistency flexible material into the pile hole of the flexible miniature pile 4 through the grouting pipe until the pile hole of the flexible miniature pile 4 is filled.
S7, constructing the pile foundation in the pile foundation construction area 1; the excess pore water pressure and the deformation of the foundation soil generated by the pile foundation soil squeezing effect are absorbed by the flexible energy absorption band 3, so that the safety of adjacent buildings, adjacent roads and adjacent underground pipelines is ensured.
The construction of the pile foundation comprises pile positioning and rechecking; positioning a drilling machine; secondary drilling and pressure irrigation; the vibration pipe is hoisted into the reinforcement cage, the bottom of the vibration pipe is abutted against the conical part of the reinforcement cage, the vibration pipe and the reinforcement cage are hoisted to the upper part of the concrete pile to be inserted into the cage together, and the reinforcement cage is lowered; filling broken stones; slurry replenishing and pile forming; thereby completing the construction.
And S8, after the pile foundation construction is finished, replacing the high-consistency flexible material in the pile hole of the flexible micro pile 4 with portland cement. Portland cement forms a row of rigid micro pile protective belts, and can play a role in later-stage supporting and protecting adjacent buildings, adjacent roads and adjacent underground pipelines.
The step of replacing the high-consistency flexible material in the pile hole of the flexible micro pile 4 with portland cement or concrete comprises the steps of injecting the portland cement or concrete into the pile hole of the flexible micro pile 4 through a grouting pipe, floating the high-consistency flexible material upwards in the injection process and flowing out of the pile hole of the flexible micro pile 4 until the portland cement or concrete floats upwards and flows out of the pile hole of the flexible micro pile 4.
Therefore, the method of the invention has the advantages of easy implementation, low cost and wide application range, can effectively eliminate or reduce the soil squeezing effect on various saturated and unsaturated soft and hard soil layers, and greatly improves the construction quality and the construction efficiency.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A method for eliminating the soil squeezing effect of a pile foundation through a flexible energy absorption belt is characterized in that: comprises the following steps;
s1, setting a pile foundation construction area (1) and dividing an adjacent building area (2) to be protected;
s2, arranging a flexible energy absorption band (3) at a position, which is 0.3-0.5 times of the distance between the pile foundation construction area (1) and the adjacent building area (2), of the pile foundation construction area (1) and the adjacent building area (2);
s3, determining the positions of two ends of the flexible energy absorbing belt (3) according to the pile foundation construction area (1);
s4, arranging a pile position of the flexible micro pile (4) at the set position of the flexible energy absorption belt (3), and presetting the diameter and the length of the flexible micro pile (4);
s5, drilling holes in the set pile positions of the flexible micro piles (4);
s6, filling high-consistency flexible materials in the pile hole of the flexible micro pile (4);
s7, constructing the pile foundation in the pile foundation construction area (1);
and S8, after the pile foundation construction is finished, replacing the high-consistency flexible material in the pile hole of the flexible micro pile (4) with portland cement or concrete.
2. The method for eliminating the pile foundation soil squeezing effect through the flexible energy absorption belt according to claim 1, wherein the method comprises the following steps: in the step S2, the flexible energy absorbing belt (3) is a straight line.
3. The method for eliminating the pile foundation soil squeezing effect through the flexible energy absorption belt according to claim 2, wherein the method comprises the following steps: in the step S3, the two ends of the flexible energy absorption belt (3) extend to the position 0.8-1.2 times of the pile distance of the precast pile (5) outside the pile foundation construction area (1).
4. The method for eliminating the pile foundation soil squeezing effect through the flexible energy absorption belt according to claim 3, wherein the method comprises the following steps: in the step S4, the distance between adjacent flexible micro-piles (4) is 0.5-1.0m, the diameter of each flexible micro-pile (4) is 0.4-0.5 times of the diameter of the precast pile (5), and the length of each flexible micro-pile (4) is 0.7-1.2 times of the length of the precast pile (5).
5. The method for eliminating the pile foundation soil squeezing effect through the flexible energy absorption belt according to claim 4, wherein the method comprises the following steps: and in the step S5, drilling the flexible micro pile (4) by a full-face engineering drilling machine.
6. The method for eliminating the pile foundation soil squeezing effect through the flexible energy absorption belt according to claim 5, wherein the method comprises the following steps: the high-consistency flexible material is bentonite.
7. The method for eliminating the pile foundation soil squeezing effect through the flexible energy absorption belt according to claim 6, wherein the method comprises the following steps: filling the high-consistency flexible material in the pile hole of the flexible micro pile (4) in the step S6 includes that the end of a grouting pipe is inserted into the bottom of the pile hole of the flexible micro pile (4), and then the high-consistency flexible material is injected into the pile hole of the flexible micro pile (4) through the grouting pipe until the pile hole of the flexible micro pile (4) is filled.
8. The method for eliminating the pile foundation squeeze effect through the flexible energy absorption belt according to claim 7, wherein the method comprises the following steps: the step S8 of replacing the high-consistency flexible material in the pile hole of the flexible micro pile (4) with portland cement or concrete includes that the portland cement or concrete is injected into the pile hole of the flexible micro pile (4) through a grouting pipe, and the high-consistency flexible material floats upwards and flows out of the pile hole of the flexible micro pile (4) in the injection process until the portland cement or concrete floats upwards and flows out of the pile hole of the flexible micro pile (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911299387.4A CN110984244A (en) | 2019-12-17 | 2019-12-17 | Method for eliminating pile foundation soil squeezing effect through flexible energy absorption belt |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911299387.4A CN110984244A (en) | 2019-12-17 | 2019-12-17 | Method for eliminating pile foundation soil squeezing effect through flexible energy absorption belt |
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| CN110984244A true CN110984244A (en) | 2020-04-10 |
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| CN201911299387.4A Withdrawn CN110984244A (en) | 2019-12-17 | 2019-12-17 | Method for eliminating pile foundation soil squeezing effect through flexible energy absorption belt |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042123A (en) * | 2019-12-27 | 2020-04-21 | 济南通达公路工程有限公司 | Construction method of prestressed pipe pile under condition close to building |
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2019
- 2019-12-17 CN CN201911299387.4A patent/CN110984244A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042123A (en) * | 2019-12-27 | 2020-04-21 | 济南通达公路工程有限公司 | Construction method of prestressed pipe pile under condition close to building |
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Application publication date: 20200410 |