CN114215066B - Collapse-prevention excavation construction method for side wall of open cut foundation pit - Google Patents
Collapse-prevention excavation construction method for side wall of open cut foundation pit Download PDFInfo
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- CN114215066B CN114215066B CN202111407770.4A CN202111407770A CN114215066B CN 114215066 B CN114215066 B CN 114215066B CN 202111407770 A CN202111407770 A CN 202111407770A CN 114215066 B CN114215066 B CN 114215066B
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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
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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
- E02D31/08—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 transmission of vibrations or movements in the foundation soil
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
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- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
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Abstract
The invention provides an open cut foundation pit side wall collapse prevention excavation construction method, which comprises the following steps: digging out the underground earth and stone to form a foundation pit; drilling and tapping a plurality of partition holes along the edge of the area to be modified of the side wall of the foundation pit, and enabling all the partition holes to be communicated in sequence to form a closed partition line; cutting a plurality of dividing grooves in a region to be modified of the side wall of the foundation pit, and dividing the region to be modified into a plurality of unit blocks; and crushing and breaking the unit blocks one by using a hydraulic breaking hammer, and finishing the construction. By adopting the technical scheme of the invention, the area to be trimmed of the side wall of the foundation pit is divided into a plurality of small-volume unit blocks, the unit blocks are crushed and broken one by one, the crushing and breaking operation of each unit block cannot disturb the surrounding earth and stone, the crushing and breaking mode of the hydraulic breaking hammer is used for replacing the explosive blasting mode in the prior art, the disturbance to the surrounding earth and stone of the foundation pit is reduced, the collapse of the foundation pit is effectively avoided, the potential safety hazard is reduced, the construction safety is improved, and the construction noise is reduced.
Description
Technical Field
The invention belongs to the technical field of subway construction engineering, and particularly relates to an open cut foundation pit side wall collapse prevention excavation construction method.
Background
Along with the improvement of economic living standard and the continuous development of technical level, promote the construction of city to get into quick development stage, the development of city is separated from the construction of subway, at first need excavate the foundation ditch in the work progress of subway, because the foundation ditch is generally all located below the groundwater level, especially some deep basal pits, the bottom degree of depth of foundation ditch far away exceeds the groundwater level, simultaneously, because the stratum condition of every city is different, especially some gravel stratum, when repairing or excavating the foundation ditch lateral wall, cause the collapse of foundation ditch wall body easily, thereby influence the progress of construction, also can bring very big hidden danger for the construction simultaneously, among the prior art, the publication number is: patent literature of CN109594564A discloses a construction method for preventing collapse of open cut of a deep foundation pit of a subway, which comprises the following steps of S1: adopting a well-point dewatering method, arranging dewatering wells around the foundation pit to form dewatering curtains, and dewatering around the foundation pit; s2: drilling piles by rotary drilling, burying pile casings, and grouting to form guard piles; s3: shiguan the beam concrete support, digging the surface layer of the foundation pit to the top standard height position of the beam concrete support, digging a groove to the required depth at the position of the beam concrete support, pouring reinforced concrete in the groove, and applying the reinforced concrete to the beam concrete support; s4: digging the deep foundation pit, constructing a pavement, and erecting a steel support; s5: repairing side slopes, drilling holes for soil nails, arranging the soil nails, grouting the soil nails, spraying concrete on the bottom layer of the wall, hanging a reinforcing steel bar net, arranging a soil nail bearing plate, spraying concrete on the wall layer, and spraying concrete on the hanging net between piles; s6: and repeating the steps S4 to S5 until the foundation pit is constructed to the required depth. The technical scheme disclosed by the patent starts from the aspects of improving drainage and improving supporting strength, a certain effect is achieved, however, when the construction method is implemented, the supporting structure is complex, the supporting construction investment cost is high, the existing urban subway generally builds up downtown areas, corresponding drainage measures and supporting measures can generate larger noise interference during construction to influence the normal life of urban residents, in addition, the prior art usually adopts an explosive blasting construction method for the foundation pit side wall trimming or excavation tunneling construction, the noise is larger, the disturbance on the surrounding earth and stone sides of the foundation pit after blasting is larger, the collapse risk of the foundation pit side wall is higher, and the potential safety hazard is larger, so that the improvement of an open cut foundation pit side wall collapse prevention trimming construction technology is needed, the subway construction efficiency is improved, the construction safety is ensured, and the hidden danger of the foundation pit collapse is eliminated while the normal construction of the subway foundation pit is ensured.
Disclosure of Invention
In order to solve the technical problems, the invention provides a collapse-preventing excavation construction method for the side wall of an open cut foundation pit.
The invention is realized by the following technical scheme.
The invention provides an open cut foundation pit side wall collapse prevention excavation construction method, which comprises the following steps:
step one: digging out the underground earth and stone to form a foundation pit;
step two: drilling and tapping a plurality of partition holes along the edge of the area to be modified of the side wall of the foundation pit, and enabling all the partition holes to be communicated in sequence to form a closed partition line;
step three: cutting a plurality of dividing grooves in the area to be trimmed of the side wall of the foundation pit, and dividing the area to be trimmed of the side wall of the foundation pit into a plurality of unit blocks;
step four: and D, crushing and breaking the unit blocks in the third step one by using a hydraulic breaking hammer, and finishing the construction.
And step two, drilling and tapping the partition holes by adopting a water mill drilling machine.
And in the second step, the aperture of the partition hole is 8cm to 15cm.
And in the second step, the depths of all the partition holes are consistent.
And in the second step, the area of the overlapping area of two adjacent partition holes is not smaller than one third of the cross section area of the partition holes.
And in the second step, the whole partition line is rectangular.
In the third step, the dividing groove is in a straight line shape connecting two sides of the partition line together.
And in the third step, the whole unit block is in a cube shape.
And step three, the dividing grooves are formed by cutting by a rock cutting machine.
In the third step, the area of any unit block is not more than 10% of the area to be modified of the side wall of the foundation pit.
The invention has the beneficial effects that: according to the technical scheme, firstly, the area to be trimmed of the side wall of the foundation pit is separated from the surrounding earth and stone by the partition line, so that construction measures for the area to be trimmed of the side wall of the foundation pit cannot be prolonged to the surrounding earth and stone, disturbance to the periphery of the area to be trimmed of the side wall of the foundation pit is avoided, then the area to be trimmed of the side wall of the foundation pit is divided into a plurality of small-size unit blocks to be crushed and broken one by one, the crushing and breaking operation of each unit block cannot disturb the surrounding earth and stone, then a crushing and breaking mode of a hydraulic breaking hammer is adopted to replace an explosive blasting mode in the prior art, disturbance to the surrounding earth and stone of the foundation pit is further reduced, collapse of the foundation pit is effectively avoided, potential safety hazards are reduced, construction safety is improved, in addition, the construction method can be suitable for the condition that hard rocks are broken and construction is required to be adopted in the foundation pit excavation process, construction cost is low, and daily life influence on residents is avoided by adopting a crushing and breaking construction mode of the hydraulic breaking hammer.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1-partition holes, 2-partition lines, 3-partition grooves and 4-unit blocks.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the above.
As shown in fig. 1, the invention provides an open cut foundation pit side wall collapse prevention excavation construction method, which comprises the following steps:
step one: digging out the underground earth and stone to form a foundation pit;
step two: drilling and tapping a plurality of partition holes 1 along the edge of the area to be modified of the side wall of the foundation pit, and enabling all the partition holes 1 to be communicated in sequence to form a closed partition line 2; further, in the second step, the partition hole 1 is drilled and tapped by a water mill drilling machine. The aperture of the partition hole 1 is 8cm to 15cm. Preferably, the aperture of the partition holes 1 is 10cm, and the depths of all the partition holes 1 in the second step are consistent. The overlapping area of two adjacent partition holes 1 is not less than one third of the cross-sectional area of the partition holes 1. The partition line 2 has a rectangular shape as a whole.
Step three: cutting a plurality of dividing grooves 3 in the area to be trimmed of the side wall of the foundation pit, and dividing the area to be trimmed of the side wall of the foundation pit into a plurality of unit blocks 4; in the third step, the dividing groove 3 is a linear shape connecting both sides of the partition line 2. In the third step, the unit block 4 is in a cubic shape as a whole. In the third step, the dividing groove 3 is formed by cutting by a rock cutter. In the third step, the area of any unit block 4 is not more than 10% of the area to be modified of the side wall of the foundation pit. In the invention, the partition grooves 3 are preferably distributed in a grid shape, so that the finer the area to be trimmed of the side wall of the foundation pit is, the smaller the volume of the construction equipment adopted in construction is, and the smaller the influence of disturbance of crushing and breaking operation is, thereby avoiding collapse of the foundation pit and improving construction safety.
Step four: and (3) crushing and breaking the unit blocks 4 in the step three by using a hydraulic breaking hammer one by one, and finishing the construction. By adopting the technical scheme of the invention, the area to be trimmed of the side wall of the foundation pit is subdivided into a plurality of small unit blocks 4, and then the unit blocks 4 are crushed and broken one by one, and as the volume of the unit blocks 4 is small, the corresponding crushing and breaking operation range and the adopted instruments are not required to be too large, so that the interference disturbance to the surrounding earth and stone can be avoided.
According to the technical scheme, firstly, the area to be trimmed of the side wall of the foundation pit is separated from the surrounding earth and stone by the partition line, so that construction measures for the area to be trimmed of the side wall of the foundation pit cannot be prolonged to the surrounding earth and stone, disturbance to the periphery of the area to be trimmed of the side wall of the foundation pit is avoided, then the area to be trimmed of the side wall of the foundation pit is divided into a plurality of small-size unit blocks to be crushed and broken one by one, the crushing and breaking operation of each unit block cannot disturb the surrounding earth and stone, then a crushing and breaking mode of a hydraulic breaking hammer is adopted to replace an explosive blasting mode in the prior art, disturbance to the surrounding earth and stone of the foundation pit is further reduced, collapse of the foundation pit is effectively avoided, potential safety hazards are reduced, construction safety is improved, in addition, the construction method can be suitable for the condition that hard rocks are broken and construction is required to be adopted in the foundation pit excavation process, construction cost is low, and daily life influence on residents is avoided by adopting a crushing and breaking construction mode of the hydraulic breaking hammer.
Claims (6)
1. The collapse-preventing excavation construction method for the side wall of the open cut foundation pit is characterized by comprising the following steps of: the method comprises the following steps:
step one: digging out the underground earth and stone to form a foundation pit;
step two: drilling and tapping a plurality of partition holes (1) along the edge of a region to be modified of the side wall of the foundation pit, and enabling all the partition holes (1) to be communicated in sequence to form a closed partition line (2);
step three: cutting a plurality of dividing grooves (3) in the area to be trimmed of the side wall of the foundation pit, and dividing the area to be trimmed of the side wall of the foundation pit into a plurality of unit blocks (4);
step four: crushing and breaking the unit blocks (4) in the third step one by using a hydraulic breaking hammer, and finishing construction;
the dividing groove (3) is in a straight line shape connecting two sides of the partition line (2) together, and the dividing groove (3) is formed by cutting by a rock cutter; in the second step, the partition hole (1) is drilled and tapped by a water mill drilling machine; in the second step, the area of the overlapping area of two adjacent partition holes (1) is not smaller than one third of the cross section area of the partition holes (1).
2. The open cut foundation pit side wall collapse prevention excavation construction method of claim 1, wherein the method comprises the following steps: in the second step, the aperture of the partition hole (1) is 8cm to 15cm.
3. The open cut foundation pit side wall collapse prevention excavation construction method of claim 1, wherein the method comprises the following steps: and in the second step, the depths of all the partition holes (1) are consistent.
4. The open cut foundation pit side wall collapse prevention excavation construction method of claim 1, wherein the method comprises the following steps: in the second step, the whole of the partition line (2) is rectangular.
5. The open cut foundation pit side wall collapse prevention excavation construction method of claim 1, wherein the method comprises the following steps: in the third step, the whole unit block (4) is in a cube shape.
6. The open cut foundation pit side wall collapse prevention excavation construction method of claim 1, wherein the method comprises the following steps: in the third step, the area of any unit block (4) is not more than 10% of the area to be modified of the side wall of the foundation pit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111407770.4A CN114215066B (en) | 2021-11-24 | 2021-11-24 | Collapse-prevention excavation construction method for side wall of open cut foundation pit |
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| CN202111407770.4A CN114215066B (en) | 2021-11-24 | 2021-11-24 | Collapse-prevention excavation construction method for side wall of open cut foundation pit |
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| CN114215066A CN114215066A (en) | 2022-03-22 |
| CN114215066B true CN114215066B (en) | 2023-09-22 |
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| CN115787768A (en) * | 2022-12-16 | 2023-03-14 | 中建海峡建设发展有限公司 | Method for excavating harder rock in ultra-narrow and ultra-deep foundation pit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103017620A (en) * | 2012-11-28 | 2013-04-03 | 泰兴市第一建筑安装工程有限公司 | Controlled blasting construction method for rock foundation pit |
| CN108729924A (en) * | 2018-05-18 | 2018-11-02 | 中车建设工程有限公司 | A kind of urban hard rock tunnel mechanical excavation rapid constructing method |
| CN209961089U (en) * | 2019-03-04 | 2020-01-17 | 青岛亿联集团股份有限公司 | Well stroke ization shale geology is bored to explode and is buried medicine structure |
| CN111119191A (en) * | 2019-12-18 | 2020-05-08 | 中建三局基础设施建设投资有限公司 | Rock foundation pit guide hole type non-blasting excavation method |
| CN111733827A (en) * | 2020-06-29 | 2020-10-02 | 中铁六局集团天津铁路建设有限公司 | Station yard deep foundation pit protection construction method under adjacent high-speed rail complex environment silt geology |
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2021
- 2021-11-24 CN CN202111407770.4A patent/CN114215066B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017620A (en) * | 2012-11-28 | 2013-04-03 | 泰兴市第一建筑安装工程有限公司 | Controlled blasting construction method for rock foundation pit |
| CN108729924A (en) * | 2018-05-18 | 2018-11-02 | 中车建设工程有限公司 | A kind of urban hard rock tunnel mechanical excavation rapid constructing method |
| CN209961089U (en) * | 2019-03-04 | 2020-01-17 | 青岛亿联集团股份有限公司 | Well stroke ization shale geology is bored to explode and is buried medicine structure |
| CN111119191A (en) * | 2019-12-18 | 2020-05-08 | 中建三局基础设施建设投资有限公司 | Rock foundation pit guide hole type non-blasting excavation method |
| CN111733827A (en) * | 2020-06-29 | 2020-10-02 | 中铁六局集团天津铁路建设有限公司 | Station yard deep foundation pit protection construction method under adjacent high-speed rail complex environment silt geology |
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