CN111395350A - Soft soil deep foundation pit soil excavation construction method - Google Patents
Soft soil deep foundation pit soil excavation construction method Download PDFInfo
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- CN111395350A CN111395350A CN202010294890.7A CN202010294890A CN111395350A CN 111395350 A CN111395350 A CN 111395350A CN 202010294890 A CN202010294890 A CN 202010294890A CN 111395350 A CN111395350 A CN 111395350A
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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
Abstract
The invention provides a soft soil deep foundation pit excavation construction method, which comprises the following steps: a, dividing a skip cabin excavation partition; b, determining the excavation sequence and the flow direction; c, arranging a temporary construction road; and d, excavating operation. The invention has the advantages that: the foundation pit is excavated to the bottom at one time, and layered excavation is not needed, so that the working efficiency can be improved, and the cost is saved; the pit is dug by jumping, the lateral pressure of the foundation pit is released in blocks, the excavation of the foundation pit is safer, the supporting measures of the lateral walls of the foundation pit such as anchor cables and the like can be reduced to a certain extent, the design is optimized, and the construction progress is accelerated; the jumping is adopted for digging soil, the basement structure is also poured in the jumping, and the water-stop steel plate on one side of the post-pouring belt and the cost of roughening can be saved; the temporary construction road and the construction sequence are reasonably designed, and the replacement and filling of the construction road are reduced.
Description
Technical Field
The invention relates to foundation pit construction, in particular to a soft soil deep foundation pit excavation construction method. The method is mainly applied to the excavation construction of the soft soil deep foundation pit with the excavation depth of 6-10m, and is particularly suitable for the excavation of the large foundation pit with small design safety reserve below the excavation depth of 10 m.
Background
The foundation pit is a soil pit excavated at a foundation design position according to a base elevation and a base plane size, and generally, a deep foundation pit refers to a foundation pit with an excavation depth of 5m or more. The construction quality of the deep foundation pit is the function of the foundation stone in the building engineering, and the layered and segmented excavation mode is a common construction method for the deep foundation pit.
For the soft soil deep foundation pit, a traditional layered and segmented excavation mode is adopted, a construction road needs to be changed and filled for many times, the earthwork excavation cost is increased, the earthwork excavation work efficiency is low, the deformation control requirement of the foundation pit is difficult to meet, the potential safety hazard of the foundation pit excavation is large, and the common technical problem faced by the soft soil deep foundation pit excavation is solved.
Disclosure of Invention
The invention provides a construction method for excavating a soft soil deep foundation pit, which solves the problems of high earthwork excavation difficulty, low work efficiency, high safety risk and the like of the soft soil deep foundation pit and has obvious economic and social benefits.
The technical scheme of the invention is realized as follows: a soft soil deep foundation pit excavation construction method comprises the following steps:
a, dividing a skip cabin excavation partition; b, determining the excavation sequence and the flow direction; c, arranging a temporary construction road; and d, excavating operation.
In the step a, the sizes of the cabin jump excavation partitions are divided according to the size requirement of the shrinkage crack of the structural bottom plate control, the space requirement of temporary slope release, the requirement of an excavation working face and the excavation efficiency, and the cabin jump excavation partitions are numbered.
And b, adopting skip cabin excavation soil among the excavation subareas to release soil stress on the side wall of the foundation pit in a partitioning manner.
And d, arranging a force transmission belt on the bottom plate and the middle floor slab of the basement, and utilizing the excavation time difference of the excavation subareas to successively apply the soil pressure of the side wall of the foundation pit on the basement structure, so that the safety risk of excavation of the foundation pit is greatly reduced.
And b, excavating from the side wall of the foundation pit to the inside of the foundation pit in the excavating flow direction, and pouring the reinforcement cushion layer close to the side wall of the foundation pit in time.
And c, arranging the temporary construction road in an area with later excavation time according to the excavation sequence, and avoiding the displacement of the temporary construction road as much as possible.
And c, excavating the spoil below the temporary construction road, and backfilling and compacting the spoil by adopting brick slag.
In the step c, the thickness of the temporary construction road is 0.5-0.7 m, and the width of the temporary construction road is 8-10 m.
And d, forming a temporary secondary slope at the excavation point of each excavation subarea, respectively arranging an excavator at the top of the slope, the middle platform of the slope and the bottom of the slope on an excavation section, performing relay excavation, and adopting an excavation mode of back excavation and one-time bottom excavation.
And d, in the step d, the jumping and digging are adopted, so that the supporting measures of anchor cables and other foundation pit side walls can be reduced, the design is optimized, and the construction progress is accelerated.
And d, digging earth by jumping the cabin, pouring the basement structure by jumping the cabin, and saving the water stop steel plate on one side of the post-pouring belt and the cost of roughening.
In the step d, the gradient of the temporary two-stage slope is 1:1.5, and the two-stage slope is always formed as the root in the back digging process to dig out earthwork.
In the step d, the size of the excavation subarea can be flexibly adjusted according to the foundation pit deformation monitoring result.
Step d, after the earthwork is excavated to the designed elevation, pouring the cushion layer within 8 hours, constructing the basement bottom plate in time, preventing the basement of the soft soil foundation pit from uplifting, and transmitting the side pressure of the foundation pit to the basement structure as soon as possible.
The invention has the advantages that: the foundation pit is excavated to the bottom at one time, and layered excavation is not needed, so that the working efficiency can be improved, and the cost is saved; the pit is dug by jumping, the lateral pressure of the foundation pit is released in blocks, the excavation of the foundation pit is safer, the supporting measures of the lateral walls of the foundation pit such as anchor cables and the like can be reduced to a certain extent, the design is optimized, and the construction progress is accelerated; the jumping is adopted for digging soil, the basement structure is also poured in the jumping, and the water-stop steel plate on one side of the post-pouring belt and the cost of roughening can be saved; the temporary construction road and the construction sequence are reasonably designed, and the replacement and filling of the construction road are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the excavation partition in example 1.
FIG. 2 is a schematic view of a temporary construction road according to embodiment 1.
Fig. 3 is a schematic diagram of two-stage slope raising in embodiment 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
A construction method for digging a soft soil deep foundation pit comprises the following steps.
and a, dividing and jumping a cabin and excavating a subarea. And dividing the size of the excavation subareas according to the size requirement of the shrinkage cracks, the space requirement of temporary slope release, the requirement of an excavation working surface and the excavation efficiency, and numbering the excavation subareas.
And b, determining the excavation sequence and the flow direction. And adopting a skip cabin to dig soil among the excavation subareas, and releasing soil stress on the side wall of the foundation pit in a blocking manner. And excavating from the side wall of the foundation pit to the inside of the foundation pit in the excavation flow direction, and pouring a reinforcement cushion layer close to the side wall of the foundation pit in time.
And c, arranging a temporary construction road. And arranging the temporary construction road in an area with later excavation time according to the excavation sequence, and avoiding the displacement of the temporary construction road as much as possible. The temporary construction road is annularly arranged, and construction machinery vehicles pass through one by one. Firstly, excavating the spoil below the temporary construction road, and then backfilling and compacting brick slag, wherein the thickness of the temporary construction road is 0.5-0.7 m, and the width of the temporary construction road is 8-10 m.
And d, excavating operation. And adopting a skip cabin to dig soil among the excavation subareas, and releasing soil stress on the side wall of the foundation pit in a blocking manner. Through set up at basement bottom plate and well floor and pass the power area, utilize the subregion of excavation's excavation time difference, successively act on basement structure with the soil pressure of foundation ditch lateral wall, reduce the safe risk of foundation ditch excavation greatly.
And forming a temporary secondary slope at each excavation point of each excavation subarea, respectively arranging an excavator on the top of a slope, a platform in the slope and the bottom of the slope on an excavation section, performing relay excavation, and adopting an excavation mode of back excavation and one-time bottom excavation. The gradient of the temporary two-stage slope is 1:1.5, and the two-stage slope is always formed as the foundation in the back digging process to dig out earthwork.
According to the foundation pit deformation monitoring result, the size of the excavation subarea can be flexibly adjusted.
After earthwork is excavated to the designed elevation, the cushion layer is poured within 8 hours, the basement bottom plate is constructed in time, the basement of the soft soil foundation pit is prevented from rising, and the side pressure of the foundation pit is transferred to the basement structure as soon as possible.
Example 1
As shown in fig. 1 to 3, a construction method for digging a soft soil deep foundation pit includes the following steps.
and a, dividing and jumping a cabin and excavating a subarea. According to the size requirement of the shrinkage crack of the structural bottom plate control, the space requirement of temporary slope release, the requirement of an excavation working face and the size of the excavation subarea divided by considering the excavation efficiency, the engineering earthwork excavation is divided into 14 areas for skip cabin excavation, and the excavation subareas are numbered.
And b, determining the excavation sequence and the flow direction. And adopting a skip cabin to dig soil among the excavation subareas, and releasing soil stress on the side wall of the foundation pit in a blocking manner. And excavating from the side wall of the foundation pit to the inside of the foundation pit in the excavation flow direction, and pouring a reinforcement cushion layer close to the side wall of the foundation pit in time. Meanwhile, according to the construction and deployment requirements of pre-sale of owners, traveling crane of roofs of basements and the like and the influence of trestles, the excavation sequence of the engineering for jumping the warehouse is 3 areas → 1 areas → 4 areas → 2 areas → 5 areas → 7 areas → 9 areas → 6 areas → 8 areas → 13 areas → 10 areas → 12 areas → 14 areas → 11 areas, and an entrance and an exit are reserved on the right side of the view. The building is sold in advance in the 3 area, construction is prioritized, and the basement top plate in the 1 area-9 area is an onsite traffic junction of the whole project and should be organized in advance.
And c, arranging a temporary construction road. The temporary construction road is arranged in an area with later excavation time, and the temporary construction road is prevented from shifting as much as possible. The engineering foundation pit is large in area, the daily average soil output is about 4000 cubes, earth excavation and foundation pit supporting are in cross construction, in order to avoid traffic jam in a site, temporary construction roads are arranged in an annular mode, and construction machinery vehicles consider 'one-inlet one-outlet' passage. Firstly, excavating and removing the deficient soil below the temporary construction road, and then backfilling and compacting brick slag; the thickness of the temporary construction road is 0.6m, and the width of the temporary construction road is 8-10 m.
And d, excavating operation. And (3) carrying out reinforcement of basement bottom plates in adjacent partitions excavated by jumping the bins, wherein before the partitions excavated in the later excavation, the basement bottom plates (the force transmission belts and the bottom plates are synchronously poured) in the adjacent partitions are poured after the partitions excavated in the later excavation are finished. The basement bottom plate construction rhythm and the earthwork excavation rhythm of the adjacent subareas are coordinated with each other, the soil stress of the side wall of the foundation pit is released in a blocking mode, and the soil pressure of the side wall of the foundation pit is transmitted to the basement structure in a blocking mode and then transmitted to the basement structure, so that the foundation pit excavation safety is guaranteed.
And the pit jumping excavation is adopted, so that the supporting measures of anchor cables and other foundation pit side walls can be reduced, the design of a foundation pit is optimized, and the construction progress is accelerated. The jumping is adopted for digging soil, the basement structure is also poured in the jumping cabin, and the water stop steel plate on one side of the post-pouring belt and the cost of roughening can be saved.
In each excavation subarea, a relay excavation mode of 'three excavators on one section' is adopted, excavation is started from the side wall of the foundation pit, a temporary two-stage slope is formed during excavation, the three excavators are respectively arranged on the top of the slope, the platform in the slope and the bottom of the slope for relay excavation and reach the bottom once (namely, no layering is carried out), compared with layering excavation, the construction road does not need to be filled out for many times, and the earthwork excavation progress is accelerated.
The gradient of the temporary two-stage slope is 1:1.5, and the two-stage slope is always formed as the foundation in the back digging process to dig out earthwork. After earthwork is excavated to the designed elevation, the cushion layer is poured within 8 hours, the basement bottom plate is constructed in time, the basement of the soft soil foundation pit is prevented from rising, and the side pressure of the foundation pit is transferred to the basement structure as soon as possible.
Before the machine is stopped during the shift, two levels of slope releasing are ensured to be formed, and the excavator is driven away from the working surface to prevent the temporary slope from collapsing. The earthwork is dug and transported immediately, and the pit edge is strictly forbidden to be piled.
During excavation operation, the size of the excavation subareas can be flexibly adjusted according to the foundation pit deformation monitoring result.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A soft soil deep foundation pit excavation construction method is characterized by comprising the following steps:
a, dividing a skip cabin excavation partition;
b, determining the excavation sequence and the flow direction;
c, arranging a temporary construction road;
and d, excavating operation.
2. A soft soil deep foundation pit excavation construction method according to claim 1 or 2, characterized in that: and b, excavating from the side wall of the foundation pit to the inside of the foundation pit in the excavating flow direction, and pouring the reinforcement cushion layer close to the side wall of the foundation pit in time.
3. The soft soil deep foundation pit excavation construction method according to claim 1, characterized in that: and c, arranging the temporary construction road in an area with later excavation time according to the excavation sequence, and avoiding the displacement of the temporary construction road as much as possible.
4. The soft soil deep foundation pit excavation construction method according to claim 3, characterized in that: and c, excavating the spoil below the temporary construction road, and backfilling and compacting the spoil by adopting brick slag.
5. The soft soil deep foundation pit excavation construction method according to claim 1, characterized in that: and d, arranging a force transmission belt on the bottom plate and the middle floor slab of the basement, and utilizing the excavation time difference of the excavation subareas to successively apply the soil pressure of the side wall of the foundation pit on the basement structure, so that the safety risk of excavation of the foundation pit is greatly reduced.
6. The soft soil deep foundation pit excavation construction method according to claim 1, characterized in that: and d, in the step d, the cabin jumping and soil digging are adopted, so that the supporting measures of anchor cables and other foundation pit side walls can be reduced, the design of the foundation pit is optimized, and the construction progress is accelerated.
7. A soft soil deep foundation pit soil excavation construction method as claimed in claim 1 or 6, characterized in that: and d, digging earth by jumping the cabin, pouring the basement structure by jumping the cabin, and saving the water stop steel plate on one side of the post-pouring belt and the cost of roughening.
8. The soft soil deep foundation pit excavation construction method according to claim 1, characterized in that: and d, forming a temporary secondary slope at the excavation point of each excavation subarea, respectively arranging an excavator at the top of the slope, the middle platform of the slope and the bottom of the slope on an excavation section, performing relay excavation, and adopting an excavation mode of back excavation and one-time bottom excavation.
9. A soft soil deep foundation pit earth-digging construction method according to claim 1 or 8, characterized in that: in the step d, the size of the excavation subarea can be flexibly adjusted according to the foundation pit deformation monitoring result.
10. A soft soil deep foundation pit earth-digging construction method according to claim 1 or 8, characterized in that: step d, after the earthwork is excavated to the designed elevation, pouring the cushion layer within 8 hours, constructing the basement bottom plate in time, preventing the basement of the soft soil foundation pit from uplifting, and transmitting the side pressure of the foundation pit to the basement structure as soon as possible.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114117585A (en) * | 2021-10-28 | 2022-03-01 | 中建三局集团(深圳)有限公司 | Method for determining target excavation scheme in foundation pit skip method construction |
| CN114164814A (en) * | 2021-11-03 | 2022-03-11 | 广州航海学院 | Foam light soil soft foundation replacement and filling construction method suitable for offshore airport reconstruction and extension projects |
| CN114232397A (en) * | 2021-11-29 | 2022-03-25 | 国网北京市电力公司 | Foundation replacement method |
| CN114922191A (en) * | 2022-05-18 | 2022-08-19 | 中国建筑第八工程局有限公司 | Construction method for narrow foundation pit in multiple foundation pits |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114117585A (en) * | 2021-10-28 | 2022-03-01 | 中建三局集团(深圳)有限公司 | Method for determining target excavation scheme in foundation pit skip method construction |
| CN114164814A (en) * | 2021-11-03 | 2022-03-11 | 广州航海学院 | Foam light soil soft foundation replacement and filling construction method suitable for offshore airport reconstruction and extension projects |
| CN114164814B (en) * | 2021-11-03 | 2023-10-13 | 广州航海学院 | Foam light soil soft foundation replacing and filling method suitable for airport reconstruction and expansion engineering |
| CN114232397A (en) * | 2021-11-29 | 2022-03-25 | 国网北京市电力公司 | Foundation replacement method |
| CN114922191A (en) * | 2022-05-18 | 2022-08-19 | 中国建筑第八工程局有限公司 | Construction method for narrow foundation pit in multiple foundation pits |
| CN114922191B (en) * | 2022-05-18 | 2024-03-12 | 中国建筑第八工程局有限公司 | Construction method for narrow foundation pit in multiple foundation pits |
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Address after: No.267, 15th Street, Jingkai, Zhengzhou, Henan Province, 450003 Applicant after: CHINA CONSTRUCTION SEVENTH ENGINEERING DIVISION Corp.,Ltd. Address before: 450003 No. 108 Chengdong Road, Jinshui District, Henan, Zhengzhou Applicant before: CHINA CONSTRUCTION SEVENTH ENGINEERING DIVISION Corp.,Ltd. |
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Application publication date: 20200710 |