CN108331002B - Design and construction method of foundation mattress layer - Google Patents
Design and construction method of foundation mattress layer Download PDFInfo
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- CN108331002B CN108331002B CN201810071182.XA CN201810071182A CN108331002B CN 108331002 B CN108331002 B CN 108331002B CN 201810071182 A CN201810071182 A CN 201810071182A CN 108331002 B CN108331002 B CN 108331002B
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- mattress
- pit
- foundation
- pile foundation
- composite pile
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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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- 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
Abstract
The invention discloses a design and construction method of a foundation mattress layer, wherein the foundation mattress layer comprises a plurality of mattresses in one-to-one correspondence with composite pile foundations, and the design and construction method comprises the following steps of piling and digging: constructing a composite pile foundation on a pile foundation construction platform, and excavating soil from the pile foundation construction platform to a foundation surface; excavating a mattress pit: excavating a mattress pit at the edge of each composite pile foundation on a building base surface, and then chiseling off part of the composite pile foundation to enable the top end of the composite pile foundation to be located at the bottom of the mattress pit; filling mattress with a film: paving an anti-seepage geomembrane in the mattress pit, enabling the anti-seepage geomembrane to be attached to the inner wall of the mattress pit, extending the anti-seepage geomembrane out of the mattress pit, forming a skirt edge at the edge of a pit opening of the mattress pit, and then filling gravel sand in the mattress pit; finally laying the building bottom plate. The construction speed is obviously accelerated, and the cost is saved. The invention is applied to the technical field of civil engineering composite foundation treatment.
Description
Technical Field
The invention relates to the technical field of civil engineering composite foundation treatment, in particular to a design and construction method of a foundation mattress layer.
Background
At present, hydraulic engineering is applied to a plurality of composite foundations, and the commonly used composite foundations comprise cement mixing piles, cement fly ash gravel piles (CFG piles), jet grouting piles and the like. A mattress layer is needed to be arranged between the composite foundation and the foundation to adjust the stress ratio between the pile soil, so that the pile and the foundation soil are stressed together, the stress concentration of the bottom surface of the foundation is reduced, and the mattress layer is made of materials with better water stability and water permeability, such as medium sand, coarse sand, graded gravel, broken stones and the like. Hydraulic engineering has higher requirements for seepage prevention along the bottom surface of a building foundation than building engineering. The mattress layer is usually fully paved on the bottom surface of the foundation, and if the mattress layer is directly applied to projects with requirements on seepage prevention of the bottom surface of the foundation, the mattress layer becomes a seepage channel and has adverse effects on seepage prevention. For the seepage prevention of the mattress layer, the currently common method is to additionally arrange an seepage prevention facility, for example, a close-packed mixing pile is arranged around the mattress layer to seal the mattress layer for seepage prevention, which increases the construction cost and the construction period.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a design and construction method of a foundation mattress layer, which can simplify anti-seepage treatment, reduce construction cost and accelerate construction period.
The technical scheme adopted by the invention is as follows: a design and construction method of a foundation mattress layer, wherein the foundation mattress layer comprises a plurality of mattress pads which correspond to composite pile foundations one by one, comprises the following steps:
a. piling and digging: constructing a composite pile foundation on a pile foundation construction platform, and excavating soil from the pile foundation construction platform to a foundation surface;
b. excavating a mattress pit: excavating a mattress pit at the edge of each composite pile foundation on a building base surface, and then chiseling off part of the composite pile foundation to enable the top end of the composite pile foundation to be located at the bottom of the mattress pit;
c. filling mattress with a film: paving an anti-seepage geomembrane in the mattress pit, enabling the anti-seepage geomembrane to be attached to the inner wall of the mattress pit, extending the anti-seepage geomembrane out of the mattress pit, forming a skirt edge at the edge of a pit opening of the mattress pit, and then filling gravel sand in the mattress pit;
d. laying a building bottom plate: and laying a concrete layer on the base building surface, penetrating the skirt edge through the concrete layer, and then laying a building bottom plate and connecting the skirt edge with the building bottom plate.
As a further improvement of the above technical scheme, in the step c, the impermeable geomembrane is of a multilayer structure.
As a further improvement of the technical scheme, in the step c, a folding area is arranged on the position, corresponding to the top end of the composite pile foundation, of the anti-seepage geomembrane laid in the mattress pit.
As a further improvement of the above technical scheme, in the step c, a thin layer of sand is arranged between the gravel sand and the impermeable geomembrane.
As a further improvement of the above technical solution, in the step b, the range of the pit opening of the mattress pit is larger than the range of upward 45 ° angular spread of the top of the composite pile foundation.
As a further improvement of the above technical solution, in the step d, the width of the remaining part of the skirt after passing through the concrete layer is more than 100 mm.
As a further improvement of the above technical scheme, in the step b, the mattress pit is compacted by static pressure or by vibroflotation after being filled with gravel sand.
The invention has the beneficial effects that: the invention effectively simplifies the anti-seepage treatment by arranging the independent mattress on each composite pile foundation, and has no mutual interference of various piling machines, thereby obviously accelerating the construction speed and saving the cost.
Drawings
The invention is further described with reference to the following figures and embodiments.
Fig. 1 is an overall structural view of the present invention.
Detailed Description
As shown in fig. 1, the design and construction method of a foundation mattress layer including a plurality of mattresses corresponding to the composite pile foundation 1 one to one includes the following steps:
a. piling and digging: the method comprises the following steps of constructing a composite pile foundation 1 on a pile foundation construction platform, excavating soil from the pile foundation construction platform to a foundation surface, wherein the distance between the pile foundation construction platform and the foundation surface is more than 500mm, and during excavation, excavating soil to a position 300-500 mm away from the foundation surface through machinery and then manually excavating the soil to the foundation surface;
b. excavating a mattress pit: excavating a mattress pit at the edge of each composite pile foundation on a foundation surface, and then chiseling off part of the composite pile foundation to enable the top end of the composite pile foundation 1 to be located at the bottom of the mattress pit;
c. filling mattress with a film: paving an impermeable geomembrane 31 in the mattress pit, enabling the impermeable geomembrane 31 to be attached to the inner wall of the mattress pit, extending the impermeable geomembrane 31 out of the mattress pit, forming a skirt edge at the edge of the pit opening of the mattress pit, and then filling gravel sand 32 in the mattress pit;
d. laying a building floor 2: a concrete layer 4 is laid on the underlying surface and the skirt is passed through the concrete layer 4, whereafter the building floor 2 is laid and the skirt is connected to the building floor 2.
This embodiment is through being equipped with solitary mattress to every composite pile foundation 1 to forming the mattress through prevention of seepage geomembrane 31 parcel gravel sand 32, making the mattress become a sealed parcel, the seepage flow need pass through from the parcel bottom, has increased the seepage footpath, promotes the prevention of seepage permeability ability of mattress, and effectual simplification prevention of seepage is handled, does not have the mutual interference of multiple pile driving machine moreover, makes construction speed obviously accelerate, has also practiced thrift the cost simultaneously.
Further preferably, in step c, the impermeable geomembrane 31 has a multilayer structure, and the impermeable geomembrane 31 in this embodiment has a double-layer structure, so as to further improve the permeability resistance of the mattress.
Preferably, in the step c, a folding area 311 is arranged at a position, corresponding to the top end of the composite pile foundation, of the anti-seepage geomembrane 31 laid in the mattress pit, and the thickness of the anti-seepage geomembrane 31 at the top of the composite pile foundation 1 is increased by folding the anti-seepage geomembrane 31, so that the anti-seepage geomembrane 31 at the top of the composite pile foundation 1 has a certain deformation space, and the integral anti-seepage effect cannot be influenced even if the anti-seepage geomembrane 31 at the top of the composite pile foundation 1 is pierced by the composite pile foundation 1.
Preferably, in the step c, a thin layer of sand 33 is arranged between the gravel sand 32 and the impermeable geomembrane 31, that is, a layer of gravel with a fine particle size is laid between the impermeable geomembrane 31 and the gravel sand 32 to prevent the impermeable geomembrane 31 from being damaged by the gravel, in this embodiment, the diameter of the gravel sand 32 is 8-20 mm, and the thickness of the thin layer of sand 33 is 25 mm.
Preferably, in the step b, the range of the pithead of the mattress pit is greater than the range of upward 45-degree angular diffusion of the top of the composite pile foundation 1, that is, any width of the pithead of the mattress pit is greater than the diameter of the composite pile foundation 1 and twice the depth of the mattress pit, in this embodiment, the depth of the mattress pit is 200mm or 300mm, and the mattress with the pit depth of 200mm is mainly used for a part of a building with a higher requirement on settlement, such as a foundation of a pump station factory building or a power station factory building; the mattress with the pit depth of 300mm is mainly used for preventing seepage of a dike body building foundation with higher requirement, and prevents the situation that the bottom plate and the foundation are separated to cause contact scouring.
It is further preferred that in step d the width of the remaining part of the skirt after it has passed through the concrete layer 4 is greater than 100 mm. Before the reinforcing steel bars of the building bottom plate 2 are installed, the edges of the permeable geomembrane are flattened by the cushion blocks, and after the reinforcing steel bars are installed, the building bottom plate 2 is poured to complete the construction of the whole mattress foundation.
The present invention is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.
Claims (7)
1. A design and construction method of a foundation mattress layer is characterized in that the foundation mattress layer comprises a plurality of mattress pads which correspond to composite pile foundations one by one, and the design and construction method comprises the following steps:
a. piling and digging: constructing a composite pile foundation on a pile foundation construction platform, and excavating soil from the pile foundation construction platform to a foundation surface;
b. excavating a mattress pit: excavating a mattress pit at the edge of each composite pile foundation on a building base surface, and then chiseling off part of the composite pile foundation to enable the top end of the composite pile foundation to be located at the bottom of the mattress pit;
c. filling mattress with a film: paving an anti-seepage geomembrane in the mattress pit, enabling the anti-seepage geomembrane to be attached to the inner wall of the mattress pit, extending the anti-seepage geomembrane out of the mattress pit, forming a skirt edge at the edge of a pit opening of the mattress pit, and then filling gravel sand in the mattress pit;
d. laying a building bottom plate: and laying a concrete layer on the base building surface, penetrating the skirt edge through the concrete layer, and then laying a building bottom plate and connecting the skirt edge with the building bottom plate.
2. The method of designing and constructing a foundation mat layer according to claim 1, characterized in that: in the step c, the anti-seepage geomembrane is of a multilayer structure.
3. The method of designing and constructing a foundation mat layer according to claim 1, characterized in that: and c, arranging a folding area on the anti-seepage geomembrane laid in the mattress pit, corresponding to the top end of the composite pile foundation.
4. The method of designing and constructing a foundation mat layer according to claim 1, 2 or 3, characterized in that: and in the step c, thin-layer sand is arranged between the gravel sand and the impermeable geomembrane.
5. The method of designing and constructing a foundation mat layer according to claim 1, 2 or 3, characterized in that: in the step b, the range of the pit opening of the mattress pit is larger than the upward 45-degree angle diffusion range of the top of the composite pile foundation.
6. The method of designing and constructing a foundation mat layer according to claim 1, 2 or 3, characterized in that: in the step d, the width of the residual part of the skirt after penetrating through the concrete layer is more than 100 mm.
7. The method of designing and constructing a foundation mat layer according to claim 1, 2 or 3, characterized in that: and in the step b, filling gravel sand in the mattress pit, and compacting by static pressure or vibration impact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810071182.XA CN108331002B (en) | 2018-01-25 | 2018-01-25 | Design and construction method of foundation mattress layer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810071182.XA CN108331002B (en) | 2018-01-25 | 2018-01-25 | Design and construction method of foundation mattress layer |
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| Publication Number | Publication Date |
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| CN108331002A CN108331002A (en) | 2018-07-27 |
| CN108331002B true CN108331002B (en) | 2020-04-21 |
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| CN201810071182.XA Active CN108331002B (en) | 2018-01-25 | 2018-01-25 | Design and construction method of foundation mattress layer |
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| CN (1) | CN108331002B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109680701B (en) * | 2019-02-01 | 2021-03-19 | 长江勘测规划设计研究有限责任公司 | Seepage-proofing structure for construction of upper pile foundation of dyke dam and construction method |
| CN112921947A (en) * | 2021-03-23 | 2021-06-08 | 夏妙水 | Foundation construction method in house building construction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20140058951A (en) * | 2012-11-07 | 2014-05-15 | (주) 선암기술연구소 | Caisson tube water-tight structure and under water structure construction method for soft ground |
| CN203546743U (en) * | 2013-10-30 | 2014-04-16 | 上海勘测设计研究院 | CFG pile composite foundation mattress layer |
| CN203716168U (en) * | 2014-01-16 | 2014-07-16 | 黄河勘测规划设计有限公司 | Toe slab foundation structure of deep covering layer of concrete face rockfill dam |
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