CN113322976A - Independent small-space excavation supporting method - Google Patents
Independent small-space excavation supporting method Download PDFInfo
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- CN113322976A CN113322976A CN202110647341.8A CN202110647341A CN113322976A CN 113322976 A CN113322976 A CN 113322976A CN 202110647341 A CN202110647341 A CN 202110647341A CN 113322976 A CN113322976 A CN 113322976A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000009412 basement excavation Methods 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 42
- 239000010959 steel Substances 0.000 claims abstract description 42
- 239000002689 soil Substances 0.000 claims abstract description 8
- 238000003466 welding Methods 0.000 claims abstract description 6
- 238000010276 construction Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 101150054854 POU1F1 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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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
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
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Abstract
The invention discloses an independent small-space excavation supporting method, which comprises the following steps: excavating a first groove at a certain distance from the outer side line of a foundation pit bearing platform on one side of the foundation pit; hoisting and conveying the steel columns into the first groove, driving the steel columns into the first groove in sequence, and then backfilling the first groove; respectively digging grooves on the other two sides of the foundation pit, driving a steel column into the grooves and backfilling the grooves and the steel column; integrally excavating earthwork in the foundation pit to a certain depth, arranging slopes on the sides, which are not provided with steel columns, of 1:1, and then welding surrounding purlins; digging a groove at the side of the steel column, driving the steel column into the groove, backfilling the steel column, and welding the enclosing purlin; excavating a certain depth around the foundation pit to ensure that the soil body does not slide. The independent small-space excavation supporting method integrally follows the principle of 'slotted support, support first and then excavation', has simple and convenient integral operation and good supporting reliability, effectively solves the problem that normal supporting can not be constructed in the environment with limited space, and has great application prospect.
Description
Technical Field
The invention relates to the technical field of foundation earthwork excavation, in particular to an excavation supporting method for an independent small space.
Background
At present, with the rapid development of the modern building industry, the development of foundation pit engineering experiences the design processes of loose surrounding environment to more complex environment, wide construction space to more narrow space, foundation pit control from support strength control to deformation control, synchronous construction from single foundation pit construction to adjacent foundation pit, and the like, and the construction difficulty is more and more high.
At present, when large foundation pits are constructed, supporting structures are often required to be arranged at the tops of the large foundation pits, various relatively independent small spaces can be formed in the support dense areas, and the heights, roads and the like in the relatively independent small spaces do not have the construction conditions of normal large construction machinery, so that the later construction of steel sheet piles, support piles and the like is influenced.
Therefore, the method for solving the problem that normal support cannot be constructed in the environment with limited space has practical significance.
Disclosure of Invention
Due to the defects in the prior art, the invention provides a method capable of solving the problem that normal support cannot be constructed in a space-limited environment, so as to solve the problem that normal support cannot be constructed in the space-limited environment in the conventional construction method.
In order to achieve the purpose, the invention provides the following technical scheme:
an independent small-space excavation supporting method comprises the following steps:
(1) excavating a first groove at a certain distance from the outer side line of a foundation pit bearing platform on one side of the foundation pit;
(2) hoisting and conveying the steel columns into the first groove, driving the steel columns into the first groove in sequence, and then backfilling the first groove;
(3) repeating the steps (1) and (2), respectively digging grooves on the other two sides of the foundation pit, driving a steel column into the foundation pit, and backfilling the foundation pit;
(4) integrally excavating earthwork in the foundation pit to a certain depth, arranging slopes on the sides, which are not provided with steel columns, of 1:1, and then welding surrounding purlins;
(5) grooving, driving in a steel column and backfilling without arranging the steel column side according to the operations of the steps (1) and (2), and then welding a surrounding purlin;
(6) excavating a certain depth around the foundation pit to ensure that the soil body does not slide.
The independent small-space excavation supporting method integrally follows the principle of 'grooving supporting, supporting first and then excavating', overcomes the difficulty that the independent small space can only be supported before earthwork excavation under the conditions of the existing equipment and materials, is simple and convenient to operate integrally, has good supporting reliability, effectively solves the problem that normal supporting cannot be constructed under the environment with limited space, and has great application prospect.
As a preferred technical scheme:
according to the independent small-space excavation supporting method, the grooving, the steel column driving and the backfilling are all completed by using a small excavator. Because the field space is limited, large-scale equipment is difficult to enter, so small-scale equipment is used for operation, and the method can also be applied to the entrance of the large-scale equipment if the construction conditions allow.
According to the independent small space excavation supporting method, the model of the small excavator is 60. The protection scope of the invention is not limited to this, and those skilled in the art can select a suitable excavator type according to actual requirements as long as the size of the excavator type can meet the requirements of site construction.
According to the independent small-space excavation supporting method, the length of the first groove is equivalent to the length of the foundation pit and the corresponding edge of the first groove. The protection scope of the present invention is not limited to this, and only one possible technical solution is given here, and those skilled in the art can set the length of the groove according to actual requirements, and of course, a plurality of grooves are opened to ensure that the foundation pit is enclosed.
According to the excavation supporting method of the independent small space, the position with a certain distance from the outer side line of the foundation pit bearing platform is 0.6m away from the outer side line of the foundation pit bearing platform;
the first groove is 2 meters deep, 0.6 meter wide and 11 meters long. The scope of the present invention is not limited to this, and only one possible solution is shown here, and those skilled in the art can design the foundation pit according to actual requirements (size of foundation pit, size and type of steel column used, soil quality of site, etc.).
According to the excavation supporting method of the independent small space, the lengths of the second groove and the third groove excavated in the step (3) and the length of the fourth groove excavated in the step (5) are respectively equal to the lengths of the corresponding sides of the foundation pit, the second groove, the third groove and the fourth groove;
the depth and width of the second groove, the third groove and the fourth groove are the same as those of the first groove.
In the excavation supporting method of the independent small space, the type of the steel column in the step (2) is HN300 multiplied by 150, the length of the steel column is 6 meters, and the distance between the adjacent steel columns is 1.5 meters. The scope of the present invention is not limited thereto, and only one possible solution is shown here, and those skilled in the art can design the solution according to actual requirements (size of foundation pit, soil quality of site, etc.).
According to the excavation supporting method for the independent small space, in the step (4), the integral excavation depth of the earthwork in the foundation pit is 0.5 m;
in the step (6), the excavation depth around the foundation pit is 1.9 m. The protection scope of the invention is not limited to this, and only a feasible technical scheme is provided here, and those skilled in the art can design according to actual requirements, and the excavation depth around the foundation pit needs to ensure that the soil body does not slide under the setting conditions.
The invention has the following advantages or beneficial effects:
the independent small-space excavation supporting method integrally follows the principle of 'grooving supporting, supporting first and then excavating', overcomes the difficulty that the independent small space can only be supported before earthwork excavation under the conditions of the existing equipment and materials, is simple and convenient to operate integrally, has good supporting reliability, effectively solves the problem that normal supporting cannot be constructed under the environment with limited space, and has great application prospect.
Drawings
The invention and its features, aspects and advantages will become more apparent from reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
FIGS. 1 to 6 are schematic views of each construction step of the independent small-space excavation supporting method of the present invention;
the steel column is divided into a first groove, a second groove, a third groove, a surrounding purlin and a fourth groove, wherein the first groove is 1-a foundation pit, the second groove is 2-a first groove, the steel column is 3-a second groove, the third groove is 5-a third groove, the surrounding purlin is 6-a fourth groove.
Detailed Description
The structure of the present invention will be further described with reference to the accompanying drawings and specific examples, but the present invention is not limited thereto.
Example 1
An independent small-space excavation supporting method is particularly applied to a project general contract project of Nanjing International precise medical center, and the field conditions are as follows: the height from the supporting beam to the ground of the basement bottom plate is about 3 meters. The field access road is only used for the excavator to walk, and other vehicles cannot access the area. A section of support beam passes through the pit above the northwest corner of the pit.
The excavation supporting method integrally follows the principle of 'supporting by slotting and then excavating', and comprises the following specific steps:
(1) as shown in fig. 1, a first groove 2 is dug by a 60-type excavator at the position of 0.6m of the outer side line of a bearing platform of a foundation pit 1, the groove depth is-2 m, the groove width is 0.6m, and the groove length is 11 m;
(2) as shown in fig. 2, the steel columns 3 are hoisted to the upper side of the first groove 2 by a tower crane on site, slowly descend into the first groove 2, and are sequentially driven into the first groove 2 by an excavator, the first groove 2 is backfilled after all the steel columns are driven into the first groove, the type of each steel column 3 is HN 300X 150, the length of each steel column is 6 meters, and the distance between every two adjacent steel columns 3 is 1.5 meters.
(3) As shown in fig. 3, the operations of the steps (1) and (2) are repeated, grooves (namely, the second groove 4 and the third groove 5) are dug, steel columns are driven and backfilled on the other two sides of the foundation pit respectively, the type and arrangement of the steel columns are the same as those of the first groove 2, the lengths of the corresponding sides of the foundation pit, the second groove 4 and the third groove 5 are the same as those of the first groove 2, and the depths and widths of the second groove 4 and the third groove 5 are the same as those of the first groove 2.
(4) As shown in figures 4 and 5, a 60-type excavator excavates the earthwork in a foundation pit by-0.5 m integrally, a 1:1 slope is placed on one side without a steel column, and after the earthwork is excavated, a surrounding purlin 6 is welded.
(5) As shown in fig. 6, the side without the steel column is subjected to grooving, steel column driving and backfilling by adopting the operations of the steps (1) and (2), and then the surrounding purlin is welded.
(6) The excavator station excavates around the foundation pit, directly excavates to 8.2 meters below zero, namely excavates 1.9 meters below zero, and the soil mass of 1.9 meters height difference can not slide on the 1.5 meters interval of steel column from the soil quality judgement of excavation on the spot.
After practical application, the independent small-space excavation supporting method is stable and safe, has good engineering quality, obviously shortens the construction period, and has substantive characteristics and obvious technical progress compared with the traditional method.
The independent small-space excavation supporting method integrally follows the principle of 'grooving supporting, supporting first and then excavating', overcomes the difficulty that the independent small space can only be supported before earthwork excavation under the conditions of the existing equipment and materials, is simple and convenient to operate integrally, has good supporting reliability, effectively solves the problem that normal supporting cannot be constructed under the environment with limited space, and has great application prospect.
Those skilled in the art will appreciate that variations may be implemented by those skilled in the art in combination with the prior art and the above-described embodiments, and will not be described herein in detail. Such variations do not affect the essence of the present invention and are not described herein.
The above description is of the preferred embodiment of the invention. It is to be understood that the invention is not limited to the particular embodiments described above, in that devices and structures not described in detail are understood to be implemented in a manner common in the art; those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments to equivalent variations, without departing from the spirit of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (8)
1. An independent small-space excavation supporting method is characterized in that: the method comprises the following steps:
(1) excavating a first groove at a certain distance from the outer side line of a foundation pit bearing platform on one side of the foundation pit;
(2) hoisting and conveying the steel columns into the first groove, driving the steel columns into the first groove in sequence, and then backfilling the first groove;
(3) repeating the steps (1) and (2), respectively digging grooves on the other two sides of the foundation pit, driving a steel column into the foundation pit, and backfilling the foundation pit;
(4) integrally excavating earthwork in the foundation pit to a certain depth, arranging slopes on the sides, which are not provided with steel columns, of 1:1, and then welding surrounding purlins;
(5) grooving, driving in a steel column and backfilling without arranging the steel column side according to the operations of the steps (1) and (2), and then welding a surrounding purlin;
(6) excavating a certain depth around the foundation pit to ensure that the soil body does not slide.
2. The method as claimed in claim 1, wherein the trenching, driving in the steel column and backfilling are performed by using a small excavator.
3. The method as claimed in claim 2, wherein the small-sized excavator is a model 60.
4. The method as claimed in claim 1, wherein the length of the first groove is equal to the length of the corresponding side of the foundation pit and the first groove.
5. The excavation supporting method of an independent small space according to claim 4, wherein the position with a certain distance from the outer side line of the foundation pit cushion cap is 0.6m from the outer side line of the foundation pit cushion cap;
the first groove is 2 meters deep, 0.6 meter wide and 11 meters long.
6. The method for supporting and excavating an independent small space according to claim 4, wherein the lengths of the second groove and the third groove excavated in the step (3) and the length of the fourth groove excavated in the step (5) are respectively equivalent to the lengths of the corresponding sides of the foundation pit, the second groove, the third groove and the fourth groove;
the depth and width of the second groove, the third groove and the fourth groove are the same as those of the first groove.
7. The method for supporting an independent small-space excavated according to claim 5, wherein the steel columns in the step (2) have a model number of HN 300X 150, a length of 6m, and a distance between adjacent steel columns of 1.5 m.
8. The excavation supporting method of an independent small space, according to claim 6, wherein in the step (4), the depth of the whole excavation of the earth in the foundation pit is 0.5 m;
in the step (6), the excavation depth around the foundation pit is 1.9 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110647341.8A CN113322976A (en) | 2021-06-10 | 2021-06-10 | Independent small-space excavation supporting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110647341.8A CN113322976A (en) | 2021-06-10 | 2021-06-10 | Independent small-space excavation supporting method |
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| CN113322976A true CN113322976A (en) | 2021-08-31 |
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| CN202110647341.8A Pending CN113322976A (en) | 2021-06-10 | 2021-06-10 | Independent small-space excavation supporting method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753381A (en) * | 2022-05-23 | 2022-07-15 | 中铁七局集团郑州工程有限公司 | Method for clearing underground obstacles in non-excavation construction path range in limited space |
-
2021
- 2021-06-10 CN CN202110647341.8A patent/CN113322976A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114753381A (en) * | 2022-05-23 | 2022-07-15 | 中铁七局集团郑州工程有限公司 | Method for clearing underground obstacles in non-excavation construction path range in limited space |
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