CN114215066A - Open cut foundation pit side wall collapse prevention excavation construction method - Google Patents
Open cut foundation pit side wall collapse prevention excavation construction method Download PDFInfo
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- CN114215066A CN114215066A CN202111407770.4A CN202111407770A CN114215066A CN 114215066 A CN114215066 A CN 114215066A CN 202111407770 A CN202111407770 A CN 202111407770A CN 114215066 A CN114215066 A CN 114215066A
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- foundation pit
- side wall
- construction method
- collapse prevention
- open cut
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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
Abstract
The invention provides an open cut foundation pit side wall collapse prevention excavation construction method, which comprises the following steps: excavating underground earthwork to form a foundation pit; drilling and tapping a plurality of partition holes along the edge of a region to be repaired on the side wall of the foundation pit, and sequentially communicating all the partition holes to form a closed partition line; cutting a plurality of dividing grooves in a to-be-trimmed area on the side wall of the foundation pit, and dividing the to-be-trimmed area into a plurality of unit blocks; and (5) crushing and breaking the unit blocks one by using a hydraulic breaking hammer, and finishing construction. By adopting the technical scheme, the area to be trimmed on the side wall of the foundation pit is divided into the plurality of small-volume unit blocks to be crushed and broken one by one, the crushing and breaking operation of each unit block cannot disturb the peripheral earthwork, and the crushing and breaking mode of the hydraulic breaking hammer replaces the explosive blasting mode in the prior art, so that the disturbance to the earthwork on the periphery 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 economic living standard's improvement and technical merit's continuous development, promote the construction in city and get into quick development stage, the development in city is apart from the construction that can not open the subway, at first need excavate the foundation ditch in the work progress of subway, because the foundation ditch is generally all being located below the groundwater level line, especially some deep basal pits, the bottom degree of depth of foundation ditch is far away more than the groundwater level line, and simultaneously, the stratum condition is different because of every city, 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: the patent document "CN 109594564A" discloses an open cut collapse prevention construction method for a subway deep foundation pit, which comprises the following steps, S1: arranging dewatering wells at the periphery of the foundation pit by adopting a well point dewatering method to form a dewatering curtain for dewatering around the foundation pit; s2: rotary drilling a drilling pile, embedding a protection cylinder, and grouting to form a fender pile; s3: constructing a crown beam concrete support, excavating the surface layer of the foundation pit to the top elevation position of the crown beam concrete support, excavating a groove at the position of the crown beam concrete support to a required depth, pouring reinforced concrete in the groove, and constructing the crown beam concrete support; s4: digging soil in a deep foundation pit, constructing a berm and erecting a steel support; s5: repairing a side slope, drilling holes by soil nails, placing the soil nails, grouting the soil nails, spraying concrete on the bottom layer of the wall, hanging a reinforcing mesh, installing soil nail bearing plates, spraying concrete on the wall surface layer, and spraying concrete on inter-pile hanging meshes; s6: and repeating the steps S4-S5 until the required foundation pit depth is reached. The technical scheme disclosed in the patent starts from two aspects of improving drainage and improving supporting strength, and provides some foundation pit collapse prevention construction methods, and certain effect is achieved, however, when the construction method is implemented, the supporting structure is complex, the supporting construction input cost is high, the existing urban subways are generally built in an urban area, corresponding drainage measures and supporting measures can generate large noise interference during construction, and the normal life of urban residents is influenced, in addition, in the prior art, explosive blasting construction methods are usually adopted for repairing or excavating and tunneling the side wall of the foundation pit, not only is the noise generated large, but also the disturbance generated to earth and stone around the foundation pit after blasting is large, the risk of collapse of the side wall of the foundation pit is high, and the potential safety hazard is large, so that an open cut foundation pit side wall collapse prevention repairing construction process needs to be improved, and the construction of the foundation pit of the subway is ensured to be normally carried out, the subway construction efficiency is improved, the construction safety is guaranteed, and the hidden danger of foundation pit collapse is eliminated.
Disclosure of Invention
In order to solve the technical problems, the invention provides an open cut foundation pit side wall collapse prevention excavation construction method.
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:
the method comprises the following steps: excavating underground earthwork to form a foundation pit;
step two: drilling and tapping a plurality of partition holes along the edge of a region to be repaired on the side wall of the foundation pit, and sequentially communicating all the partition holes to form a closed partition line;
step three: cutting a plurality of partition grooves in a to-be-repaired area of the side wall of the foundation pit, and dividing the to-be-repaired area of the side wall of the foundation pit into a plurality of unit blocks;
step four: and (4) crushing and breaking the unit blocks in the third step one by using a hydraulic breaking hammer, and finishing construction.
And step two, the partition hole is formed by drilling by using a water mill drilling machine.
In the second step, the aperture of the partition hole is 8 cm-15 cm.
And in the second step, the depths of all the partition holes are consistent.
And in the second step, the area of the overlapped area of two adjacent partition holes is not less than one third of the area of the cross section of each partition hole.
And in the second step, the whole of the isolating line is in a rectangular shape.
In the third step, the dividing groove is a straight line connecting two sides of the partition line together.
In the third step, the unit block is in a cubic shape as a whole.
And in the third step, the dividing groove is formed by cutting by a rock cutting machine.
In the third step, the area of any unit block does not exceed 10% of the area to be trimmed on the side wall of the foundation pit.
The invention has the beneficial effects that: by adopting the technical scheme of the invention, firstly, the area to be repaired of the side wall of the foundation pit is separated from the peripheral earthwork through the partition line, so that construction measures carried out on the area to be repaired of the side wall of the foundation pit cannot extend to the peripheral earthwork, the disturbance on the periphery of the area to be repaired of the side wall of the foundation pit is avoided, then, the area to be repaired of the side wall of the foundation pit is divided into a plurality of small-volume unit blocks to be crushed and broken one by one, the crushing and breaking operation of each unit block cannot disturb the peripheral earthwork, then, the crushing and breaking mode of the hydraulic crushing hammer replaces the explosive blasting mode in the prior art, the disturbance on the peripheral earthwork of the foundation pit is further reduced, the collapse of the foundation pit is effectively avoided, the potential safety hazard is reduced, the construction safety is improved, and in addition, the construction method can be suitable for the situation of carrying out the breaking construction when hard rocks are encountered in the excavation process of the foundation pit, and the construction supporting device that needs to adopt is less, and the construction input cost is lower, adopts the construction mode that hydraulic breaking hammer smashed the abolishment to reduce the construction noise, avoids causing the influence to peripheral resident's daily life.
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 described.
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:
the method comprises the following steps: excavating underground earthwork to form a foundation pit;
step two: drilling and tapping a plurality of partition holes 1 along the edge of a region to be repaired on the side wall of the foundation pit, and sequentially communicating all the partition holes 1 to form a closed partition line 2; further, in the second step, the partition hole 1 is formed by drilling and tapping through a water mill drilling machine. The aperture of the partition hole 1 is 8cm to 15 cm. Preferably, the aperture of the partition hole 1 is 10cm, and the depths of all the partition holes 1 in the step two are consistent. The area of the overlapped area of two adjacent partition holes 1 is not less than one third of the cross-sectional area of the partition hole 1. The partition line 2 is rectangular as a whole.
Step three: cutting a plurality of partition grooves 3 in a region to be repaired of the side wall of the foundation pit, and dividing the region to be repaired of the side wall of the foundation pit into a plurality of unit blocks 4; the dividing groove 3 in step three is a straight line connecting both sides of the dividing line 2. The unit block 4 in step three is a cubic shape as a whole. The dividing groove 3 in the third step is formed by cutting with a rock cutting machine. In the third step, the area of any unit block 4 does not exceed 10% of the region to be trimmed on the side wall of the foundation pit. In the invention, the division grooves 3 are preferably distributed in a grid shape, the thinner the area to be repaired on the side wall of the foundation pit is divided, the smaller the corresponding volume of the construction equipment adopted during construction is, and the smaller the influence of crushing and breaking operation disturbance is, thereby avoiding collapse of the foundation pit and improving the construction safety.
Step four: and (4) crushing and breaking the unit blocks 4 in the third step one by using a hydraulic breaking hammer, and finishing construction. By adopting the technical scheme of the invention, the area to be trimmed on 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, because the unit blocks 4 have small volume, the working amplitude of the corresponding crushing and breaking operation and the adopted instruments do not need to be too large, so that the interference disturbance to the peripheral earthwork can be avoided.
By adopting the technical scheme of the invention, firstly, the area to be repaired of the side wall of the foundation pit is separated from the peripheral earthwork through the partition line, so that construction measures carried out on the area to be repaired of the side wall of the foundation pit cannot extend to the peripheral earthwork, the disturbance on the periphery of the area to be repaired of the side wall of the foundation pit is avoided, then, the area to be repaired of the side wall of the foundation pit is divided into a plurality of small-volume unit blocks to be crushed and broken one by one, the crushing and breaking operation of each unit block cannot disturb the peripheral earthwork, then, the crushing and breaking mode of the hydraulic crushing hammer replaces the explosive blasting mode in the prior art, the disturbance on the peripheral earthwork of the foundation pit is further reduced, the collapse of the foundation pit is effectively avoided, the potential safety hazard is reduced, the construction safety is improved, and in addition, the construction method can be suitable for the situation of carrying out the breaking construction when hard rocks are encountered in the excavation process of the foundation pit, and the construction supporting device that needs to adopt is less, and the construction input cost is lower, adopts the construction mode that hydraulic breaking hammer smashed the abolishment to reduce the construction noise, avoids causing the influence to peripheral resident's daily life.
Claims (10)
1. The collapse prevention excavation construction method for the side wall of the open excavation foundation pit is characterized by comprising the following steps of: the method comprises the following steps:
the method comprises the following steps: excavating underground earthwork to form a foundation pit;
step two: drilling a plurality of partition holes (1) along the edge of a region to be repaired on the side wall of the foundation pit, and sequentially communicating all the partition holes (1) to form a closed partition line (2);
step three: cutting a plurality of partition grooves (3) in a region to be repaired of the side wall of the foundation pit, and dividing the region to be repaired of the side wall of the foundation pit into a plurality of unit blocks (4);
step four: and (3) crushing and breaking the unit blocks (4) in the third step one by using a hydraulic breaking hammer, and finishing construction.
2. The open cut foundation pit side wall collapse prevention excavation construction method of claim 1, characterized in that: and in the second step, the partition hole (1) is formed by drilling and tapping by using a water mill drilling machine.
3. The open cut foundation pit side wall collapse prevention excavation construction method of claim 1, characterized in that: in the second step, the aperture of the partition hole (1) is 8cm to 15 cm.
4. The open cut foundation pit side wall collapse prevention excavation construction method of claim 1, characterized in that: and in the second step, the depths of all the partition holes (1) are consistent.
5. The open cut foundation pit side wall collapse prevention excavation construction method of claim 1, characterized in that: in the second step, the area of the overlapping area of two adjacent partition holes (1) is not less than one third of the area of the cross section of each partition hole (1).
6. The open cut foundation pit side wall collapse prevention excavation construction method of claim 1, characterized in that: in the second step, the whole of the isolating line (2) is rectangular.
7. The open cut foundation pit side wall collapse prevention excavation construction method of claim 1, characterized in that: in the third step, the dividing groove (3) is a straight line connecting both sides of the separating line (2).
8. The open cut foundation pit side wall collapse prevention excavation construction method of claim 1, characterized in that: in the third step, the unit block (4) is integrally in a cubic shape.
9. The open cut foundation pit side wall collapse prevention excavation construction method of claim 1, characterized in that: in the third step, the dividing groove (3) is formed by cutting with a rock cutting machine.
10. The open cut foundation pit side wall collapse prevention excavation construction method of claim 1, characterized in that: in the third step, the area of any unit block (4) does not exceed 10% of the area to be trimmed on the side wall of the 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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| 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 true CN114215066A (en) | 2022-03-22 |
| CN114215066B CN114215066B (en) | 2023-09-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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