CN112502180A - Construction method of deep foundation pit basement bottom raft - Google Patents
Construction method of deep foundation pit basement bottom raft Download PDFInfo
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- CN112502180A CN112502180A CN202011446183.1A CN202011446183A CN112502180A CN 112502180 A CN112502180 A CN 112502180A CN 202011446183 A CN202011446183 A CN 202011446183A CN 112502180 A CN112502180 A CN 112502180A
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- foundation pit
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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
- E02D27/01—Flat 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
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- Environmental & Geological Engineering (AREA)
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- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a construction method of a raft at the bottom layer of a basement of a deep foundation pit, which comprises the following steps: (1) arranging a waterproof curtain in the red land line; (2) arranging a plurality of foundation pit fender piles at the inner side of the waterproof curtain; (3) arranging horizontal supporting beams between the foundation pit fender posts; (4) excavating earth; (5) arranging a raft cushion layer; (6) arranging a force transmission component; (7) waterproof layers are arranged on the upper surface of the raft cushion layer and the outer side surface of the force transmission component; (8) arranging a waterproof protective layer on the waterproof layer; (9) and arranging a raft at the bottom layer of the basement of the deep foundation pit on the waterproof protective layer. The invention not only creates good conditions for the subsequent waterproof layer laying on the side surface of the basement wall body, but also simplifies the construction process, reduces the construction cost and improves the waterproof performance of the basement.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a deep foundation pit supporting system and a construction method of a basement raft.
Background
Along with the city rapid development of our country, the nervous phenomenon of urban land is constantly exposed, for increasing the utilization ratio of building in the land red line to the place, basement design is more and more common in 2 ~ 4 layers, and basement structure is more and more in the urban construction, and people regard as market, garage, underground workshop, even house etc. with the basement usually, therefore, the waterproof of basement is especially important.
At present, the basement waterproof structure construction method is to construct a deep foundation pit supporting structure, then perform foundation pit earthwork excavation, then cast a basement raft bed layer, lay a basement raft waterproof layer, cast a waterproof protective layer, cast basement raft concrete, lay raft peripheral waterproof layers, and finally cast a force transmission belt (if a yellow sand buffer belt exists, the yellow sand buffer belt is backfilled first) between the outer side surface of the basement raft and a foundation pit supporting pile. However, the construction method and the basement waterproof structure prepared by the construction method have the following defects: (1) because the raft waterproof layer laid and pasted firstly is positioned on the surface of the cushion layer, no facilities for temporarily fixing the waterproof coiled material are arranged on the periphery during construction operation, and the waterproof layer is usually laid and pasted on the edge of the raft or even the edge of the force transmission belt, so that material waste is caused, and the construction cost is increased; (2) because there is a layer of fine aggregate concrete protective layer between waterproof layer and raft, cause to appear the fault between raft waterproof layer and the basement lateral wall waterproof layer, lead to the probability greatly increased of basement seepage.
Therefore, a new construction method of the raft at the bottom layer of the basement of the deep foundation pit is developed, the construction process is optimized, the construction cost is further reduced, the waterproof performance of the basement is improved, and the construction method obviously has positive practical significance.
Disclosure of Invention
The invention aims to provide a construction method of a basement bottom raft.
In order to achieve the purpose, the invention adopts the technical scheme that: a construction method of a raft at the bottom layer of a basement of a deep foundation pit comprises the following steps:
(1) arranging a waterproof curtain in the red land line;
(2) arranging a plurality of foundation pit fender piles at the inner side of the waterproof curtain; the foundation pit fender posts are arranged at intervals;
(3) arranging horizontal supporting beams between the foundation pit retaining piles, wherein the horizontal supporting beams are positioned at the upper parts of the cast-in-place piles;
(4) excavating earth to form a basement of a deep foundation pit;
(5) arranging a raft cushion layer at the bottom of the deep foundation pit basement relative to the position of the raft;
(6) a force transmission component is arranged between the foundation pit fender post and the raft cushion layer;
(7) waterproof layers are arranged on the upper surface of the raft cushion layer and the outer side surface of the force transmission component;
(8) arranging a waterproof protective layer on the waterproof layer in the step (7);
(9) arranging a raft at the bottom layer of the basement of the deep foundation pit on the waterproof protective layer;
the deep foundation pit basement bottom raft and the force transmission component are tightly matched and form a horizontal supporting structure between the foundation pit fender piles.
In the above, the waterproof curtain is a cement mixing pile with a diameter of 60-100 cm. Preferably an 80cm diameter triaxial mixing stub.
In the above, the raft at the bottom layer of the basement of the deep foundation pit and the force transmission component are arranged horizontally and in parallel, generally, the foundation pit fender post is arranged at the outermost periphery, then the force transmission component is arranged at the inner layer, then the raft at the bottom layer of the basement of the deep foundation pit is arranged at the inner side, and the raft at the bottom layer and the force transmission component form the horizontal stress supporting structure of the plurality of foundation pit fender posts together.
Preferably, in the step (2), the foundation pit fender pile is a cast-in-place pile.
In the above technical scheme, in the step (2), the foundation pit fender piles are arranged at intervals, and the interval between adjacent foundation pit fender piles is 0.3-2 m. Preferably 1 to 1.5 m. The size of the foundation pit fender post is 1 multiplied by 1m of a circular concrete cast-in-place pile.
In the above technical solution, in the step (2), a plurality of foundation pit fender piles are arranged inside the waterproof curtain to form a geometric shape. The geometric shape is determined according to the shape of the actual place, and it is needless to say that the geometric shape may be divided in advance, which belongs to the prior art.
Preferably, in the step (7), the waterproof layer is formed by laying waterproof rolls. Waterproof coatings may of course also be used to prepare the waterproof layer.
Preferably, in the step (9), the bottom raft of the basement of the deep foundation pit is flush with the upper surface of the force transmission component.
Preferably, in the step (5), the raft bedding layer is a concrete layer.
Preferably, in the step (4), the depth of the basement of the deep foundation pit is 8-15 m. Preferably 8 to 10 m.
In the above technical solution, in the step (6), the force transmission member has the following structure: the buffer layer is close to one side of deep foundation pit basement bottom raft is the stereoplasm isolation layer. The buffer layer is a yellow sand layer and mainly plays a role in buffering stress. The hard isolation layer can be a plate brick layer.
Preferably, the force transmission belt is flush with the inner side face of the hard isolation layer.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the invention has developed a new construction method of the basement bottom raft of the deep basal pit, pass the force transfer component first, then set up the waterproof layer on the upper surface of the bed course of the raft, and the lateral surface of the force transfer component, prepare the raft at last, thus not merely realize the laying of the waterproof layer of the bottom surface of the raft, and finished the laying of the waterproof layer of the lateral surface of the raft at the same time, and, this way has created the good condition for the subsequent waterproof layer laying of the lateral surface of basement wall, namely, as long as continue to extend and set up the waterproof layer on the waterproof layer of the lateral surface of the force transfer component, thus has simplified the construction process greatly, has improved the waterproof performance;
2. the waterproof layers on the upper surface of the raft cushion layer and the outer side surface of the force transmission component are paved in advance and together, and compared with the prior art, the lapping of the waterproof materials at the bottom of the raft is reduced, so that the materials can be further saved, and the cost is reduced;
3. compared with the prior art, the invention can reduce the waterproof construction process of the side surface of the raft, optimize the construction process and has positive practical significance;
4. the method is simple and easy to implement, has low cost and is suitable for popularization and application.
Drawings
FIG. 1 is a partial cross-sectional view of a basement of a medium-deep foundation pit according to an embodiment of the invention;
fig. 2 is an enlarged view of a portion a of fig. 1.
Wherein, 1, a waterproof curtain; 2. foundation pit fender posts; 3. a horizontal support beam; 4. a raft bed course; 5. A waterproof layer; 6. raft plates at the bottom layer of the basement of the deep foundation pit; 7. a force transfer belt; 8. a buffer layer; 9. a hard isolating layer.
Detailed Description
The invention will be further described with reference to the following examples:
example one
Referring to fig. 1-2, a construction method of a deep foundation pit basement bottom raft comprises the following steps:
(1) a waterproof curtain 1 is arranged in the red land line;
(2) a plurality of foundation pit fender piles 2 are arranged on the inner side of the waterproof curtain; the foundation pit fender posts are arranged at intervals;
(3) arranging horizontal supporting beams 3 between the foundation pit retaining piles, wherein the horizontal supporting beams are positioned at the upper parts of the cast-in-place piles;
(4) excavating earth to form a basement of a deep foundation pit;
(5) arranging a raft cushion layer 4 at the bottom of the deep foundation pit basement relative to the position of the raft;
(6) a force transmission component is arranged between the foundation pit fender post and the raft cushion layer;
(7) waterproof layers 5 are arranged on the upper surface of the raft cushion layer and the outer side surface of the force transmission component;
(8) arranging a waterproof protective layer on the waterproof layer in the step (7);
(9) arranging a raft 6 at the bottom layer of the basement of the deep foundation pit on the waterproof protective layer;
the deep foundation pit basement bottom raft and the force transmission component are tightly matched and form a horizontal supporting structure between the foundation pit fender piles.
In the above, preferably, the waterproof curtain is a triaxial mixing pile having a diameter of 80 cm.
In the above, the raft at the bottom layer of the basement of the deep foundation pit and the force transmission component are arranged horizontally and in parallel, generally, the foundation pit fender post is arranged at the outermost periphery, then the force transmission component is arranged at the inner layer, then the raft at the bottom layer of the basement of the deep foundation pit is arranged at the inner side, and the raft at the bottom layer and the force transmission component form the horizontal stress supporting structure of the plurality of foundation pit fender posts together.
In this embodiment, in the step (2), the foundation pit fender piles are arranged at intervals, and the interval between adjacent foundation pit fender piles is 1 m. The size of the foundation pit fender post is 1 multiplied by 1m of a circular concrete cast-in-place pile.
In this embodiment, in the step (7), the waterproof layer is formed by laying waterproof rolls.
In this embodiment, in step (9), the raft at the bottom layer of the basement of the deep foundation pit is flush with the upper surface of the force transmission member.
In this embodiment, in the step (4), the depth of the basement of the deep foundation pit is 9 m.
In this embodiment, in the step (6), the force transmission member has the following structure: mainly constitute by the biography power area 7 on the upper strata and the buffer layer 8 of lower floor that range upon range of setting, the buffer layer is close to one side of deep basal pit basement bottom raft is stereoplasm isolation layer 9. The buffer layer is a yellow sand layer and mainly plays a role in buffering stress. The hard isolation layer can be a plate brick layer. The force transmission belt is flush with the inner side surface of the hard isolation layer.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A construction method of a raft at the bottom layer of a basement of a deep foundation pit is characterized by comprising the following steps:
(1) arranging a waterproof curtain in the red land line;
(2) arranging a plurality of foundation pit fender piles at the inner side of the waterproof curtain; the foundation pit fender posts are arranged at intervals;
(3) arranging horizontal supporting beams between the foundation pit retaining piles, wherein the horizontal supporting beams are positioned at the upper parts of the cast-in-place piles;
(4) excavating earth to form a basement of a deep foundation pit;
(5) arranging a raft cushion layer at the bottom of the deep foundation pit basement relative to the position of the raft;
(6) a force transmission component is arranged between the foundation pit fender post and the raft cushion layer;
(7) waterproof layers are arranged on the upper surface of the raft cushion layer and the outer side surface of the force transmission component;
(8) arranging a waterproof protective layer on the waterproof layer in the step (7);
(9) arranging a raft at the bottom layer of the basement of the deep foundation pit on the waterproof protective layer;
the deep foundation pit basement bottom raft and the force transmission component are tightly matched and form a horizontal supporting structure between the foundation pit fender piles.
2. The method for constructing bottom rafts in basement of deep foundation pit according to claim 1, wherein in the step (2), the foundation pit fender pile is a cast-in-place pile.
3. The construction method of the bottom rafts of the basement of the deep foundation pit as claimed in claim 1, wherein in the step (2), the foundation pit fender piles are arranged at intervals, and the interval between adjacent foundation pit fender piles is 0.3-2 m.
4. The method for constructing bottom rafts in basement of deep foundation pit according to claim 1, wherein in the step (2), a plurality of foundation pit fender posts are arranged on the inner side of the waterproof curtain to form a geometric shape.
5. The construction method of the bottom rafts of the basement of the deep foundation pit as claimed in claim 1, wherein in the step (7), the waterproof layer is laid by waterproof rolls.
6. The method for constructing bottom rafts in basement of deep foundation pit according to claim 1, wherein in step (9), the bottom raft is arranged flush with the upper surface of the force transmission member.
7. The construction method of bottom rafts in basement of deep foundation pit according to claim 1, wherein in the step (5), the raft cushion layer is concrete layer.
8. The construction method of the bottom rafts of the basement of the deep foundation pit according to claim 1, wherein in the step (4), the depth of the basement of the deep foundation pit is 8-15 m.
9. The construction method of bottom rafts in basement of deep foundation pit according to claim 1, wherein in the step (6), the structure of the force transmission component is as follows: the buffer layer is close to one side of deep foundation pit basement bottom raft is the stereoplasm isolation layer.
10. The method for constructing bottom rafts in basement of deep foundation pit as claimed in claim 9, wherein said force transmission belt is flush with the inner side of said hard isolation layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011446183.1A CN112502180A (en) | 2020-12-09 | 2020-12-09 | Construction method of deep foundation pit basement bottom raft |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011446183.1A CN112502180A (en) | 2020-12-09 | 2020-12-09 | Construction method of deep foundation pit basement bottom raft |
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| CN112502180A true CN112502180A (en) | 2021-03-16 |
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| CN202011446183.1A Pending CN112502180A (en) | 2020-12-09 | 2020-12-09 | Construction method of deep foundation pit basement bottom raft |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103669402A (en) * | 2013-12-25 | 2014-03-26 | 华东建筑设计研究院有限公司 | Pile and wall integrated structure combining outer wall of basement body and guard pile |
| CN104895089A (en) * | 2015-04-08 | 2015-09-09 | 山东大学 | Construction method of permanent retaining system characterized by joint work of basement floor slabs and retaining piles |
| CN106869304A (en) * | 2017-02-24 | 2017-06-20 | 中国十七冶集团有限公司 | Outer wall of basement waterproof construction and construction method in a kind of confined space |
| US9970193B1 (en) * | 2016-04-28 | 2018-05-15 | Boxer Anaya, LLC | System and method for the construction of dwellings |
| CN108060683A (en) * | 2017-12-18 | 2018-05-22 | 烟建集团有限公司 | A kind of middle weathering geology top-down construction method |
| CN109457717A (en) * | 2018-11-02 | 2019-03-12 | 中建四局第六建筑工程有限公司 | A kind of structure and construction method of big thickness pile-raft foundation off-loading separation layer |
-
2020
- 2020-12-09 CN CN202011446183.1A patent/CN112502180A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103669402A (en) * | 2013-12-25 | 2014-03-26 | 华东建筑设计研究院有限公司 | Pile and wall integrated structure combining outer wall of basement body and guard pile |
| CN104895089A (en) * | 2015-04-08 | 2015-09-09 | 山东大学 | Construction method of permanent retaining system characterized by joint work of basement floor slabs and retaining piles |
| US9970193B1 (en) * | 2016-04-28 | 2018-05-15 | Boxer Anaya, LLC | System and method for the construction of dwellings |
| CN106869304A (en) * | 2017-02-24 | 2017-06-20 | 中国十七冶集团有限公司 | Outer wall of basement waterproof construction and construction method in a kind of confined space |
| CN108060683A (en) * | 2017-12-18 | 2018-05-22 | 烟建集团有限公司 | A kind of middle weathering geology top-down construction method |
| CN109457717A (en) * | 2018-11-02 | 2019-03-12 | 中建四局第六建筑工程有限公司 | A kind of structure and construction method of big thickness pile-raft foundation off-loading separation layer |
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Application publication date: 20210316 |