CN115198765A - Method for dismantling inner support of foundation pit - Google Patents
Method for dismantling inner support of foundation pit Download PDFInfo
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- CN115198765A CN115198765A CN202210898841.3A CN202210898841A CN115198765A CN 115198765 A CN115198765 A CN 115198765A CN 202210898841 A CN202210898841 A CN 202210898841A CN 115198765 A CN115198765 A CN 115198765A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000010276 construction Methods 0.000 claims abstract description 16
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 230000003068 static effect Effects 0.000 claims abstract description 5
- 230000005855 radiation Effects 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000005192 partition Methods 0.000 abstract description 2
- 239000004567 concrete Substances 0.000 description 7
- 238000004088 simulation Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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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Abstract
The invention provides a method for removing an inner support of a foundation pit, which belongs to the technical field of construction for removing the inner support of the foundation pit and comprises the following steps: dividing the inner support system into a plurality of areas according to a foundation pit construction area; attempts have been made to enumerate the removal sequence of the supports in multiple levels; respectively simulating the dismantling sequence through software, and collecting data of the dismantling sequence on the influence of the dismantling sequence on the surrounding environment; selecting a dismantling sequence with the smallest influence; dismantling is carried out according to the selected sequence in a static cutting mode; and after the horizontal inner support is dismantled, dismantling the vertical inner support structure. According to the method, the horizontal support dismantling sequence is optimized, the deformation influence of the horizontal support dismantling sequence is simulated through software, and dismantling is performed according to the general idea of partition dismantling, dismantling sequence optimization and reinforced monitoring; the safety of the tunnel between subway operation areas, the civil insurance buildings and the residential building during the dismantling and supporting period is ensured.
Description
Technical Field
The invention belongs to the technical field of foundation pit inner support dismantling construction, and particularly relates to a method for dismantling a foundation pit inner support.
Background
With the continuous development of infrastructure construction and the continuous improvement of people's demand, the construction position of foundation ditch project is more and more close to subway interval tunnel, historical relic's protection building, residential area etc. and the deformation influence of deep foundation ditch engineering to the surrounding environment is also bigger and bigger in the work progress to make deep foundation ditch engineering to the protection requirement of surrounding environment during each process construction more and more high.
Because more and more projects are located in the urban center, in order to meet the deformation requirements of underground buildings (structures) such as subways and residential buildings which are sensitive to abnormal deformation, most of horizontal support systems usually adopt reinforced concrete inner supports, and the deformation influence on foundation pit support structures, subway interval tunnels and surrounding buildings is large during the traditional support dismantling process. The foundation pit is ultra deep, the internal force of the horizontal concrete support is large, and if a targeted dismantling scheme is not adopted to slowly and directionally release the internal force of the horizontal support, the foundation pit support structure and the surrounding environment are greatly influenced.
For example, the original site reconstruction and expansion project of the obstetrical and gynecological hospital in the Tianjin city center is located in the Tianjin city and the junior camp way No. 146, and the surrounding environment is complex: the north side is close to the west division church cultural relic protection building, and the south side is close to the No. 3 subway line operation line. This engineering is deep foundation ditch engineering, and the supporting system structure is for "underground continuous wall + twice concrete level support (the support form adopts the ring to support + props) in, not only will guarantee foundation ditch safety, will guarantee the normal operation of peripheral subway moreover, and the difficulty is great.
Disclosure of Invention
In view of this, the present invention provides a method for removing an inner support of a foundation pit, so as to alleviate the above technical problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for dismantling an inner support of a foundation pit comprises the following steps:
s1, dividing an inner support system into a plurality of areas according to a foundation pit construction area;
s2, trying to enumerate a plurality of horizontal inner support dismantling sequences according to the design of the inner support of the foundation pit;
s3, respectively simulating the dismantling sequence through software, and collecting data of influences of the dismantling sequence on the surrounding environment;
s4, selecting a dismantling sequence with the smallest influence according to the data;
s5: carrying out dismantling according to the selected sequence in a static cutting mode;
and S6, removing the vertical inner support structure after the horizontal inner support is removed.
Further, the multiple horizontal inner support dismantling sequences in step S2 include a horizontal support overall dismantling sequence and a per-area gusset dismantling sequence.
Further, the whole horizontal support dismantling sequence at least comprises two sequences;
the first method is to remove the large ring brace; removing the small ring support; dismantling the peripheral radiation support; removing the middle counter stay;
the second is to remove the peripheral radiation support; dismantling the large ring support; removing the small ring support; and (5) dismantling the middle counter stay.
Further, each of the regional gusset removal sequences includes two;
the first method is that firstly, the corner brace vertical to the ring brace direction is dismantled, and then the corner brace parallel to the ring brace direction is dismantled;
the second method is to remove the angle brace parallel to the ring brace first and then remove the angle brace perpendicular to the ring brace.
Further, step S5 and step S6 both include monitoring the foundation pit and the surrounding environment.
Compared with the prior art, the method for dismantling the foundation pit inner support has the following advantages:
1. the method avoids the problems that the deformation value is suddenly changed during the support dismantling period to cause data alarm, field shutdown, influence on the safety of the surrounding environment and the like because the dismantling sequence is not optimized during the traditional concrete horizontal inner support dismantling; the method comprises the following steps of simulating deformation influence of a horizontal support by optimizing a horizontal support dismantling sequence and software, and dismantling according to the general idea of 'partition dismantling, dismantling sequence optimization and enhanced monitoring'; the safety of the tunnel between subway operation areas, the civil insurance buildings and the residential building during the support dismantling period is ensured.
2. According to the invention, the demolition construction is divided according to the areas, and each area is sequentially constructed according to the optimized demolition sequence, so that the flow construction operation can be formed, the construction progress is accelerated, and the materials are saved, scientific and reasonable.
3. When the inner concrete support is removed, the plate buckle frame bodies are all adopted for supporting the bottom, so that the dragging effect of a support system and an enclosure system at the moment of removing local components is avoided.
4. During the concrete horizontal support is dismantled, all adopt static (rope saw) cutting mode, guaranteed the safety of all ring edge borders such as subway operation interval during dismantling to prop greatly.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the overall structure of the foundation pit support according to the present invention;
FIG. 2 is a schematic view of the present invention with the horizontal supports removed;
FIG. 3 is a schematic view of a deformation influence curve of the building envelope according to the first bracing-dismantling sequence;
fig. 4 is a schematic view of a deformation influence curve of the building envelope by the second bracing-dismantling sequence.
Description of reference numerals:
1-supporting plate strips; 2-large ring bracing; 3-small ring bracing; 4-splayed support; 5-bracing; 6-underground wall; 7-angle brace.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or may be connected through elements within two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 and 2, the invention provides a method for dismantling an inner support of a foundation pit, which comprises the following steps: the first step is as follows: reasonably planning a dismantling construction sequence, and dividing the inner support system into 5 areas according to a foundation pit construction area, namely an area A, an area B, an area C, an area D and a diagonal brace 5 area (including a splayed brace 4);
the second step is that: optimizing the removal sequence of the support rod pieces according to the general design of the integral support of the engineering foundation pit; analyzing the surrounding environment condition of the foundation pit according to the types of the engineering support rod pieces, and integrally dividing the horizontal support dismantling sequence into two types:
as a first horizontal brace removal sequence: (1) breaking the large ring support 2; (2) breaking the small ring support 3; (3) sequentially breaking peripheral radiation supports; (4) and finally, removing the middle diagonal brace 5.
The second horizontal support removal sequence: (1) sequentially breaking peripheral radiation supports; (2) breaking the large ring support 2; (3) breaking the small ring support 3; (4) and finally, removing the middle diagonal brace 5.
The third step:
carrying out model building on different dismantling sequences through software and carrying out deformation data acquisition and analysis on the influence of the model building on surrounding environments such as a building envelope, a subway tunnel and the like;
and (3) analyzing the deformation condition of the diaphragm wall 6 in the first horizontal support dismantling mode according to model simulation:
the removal of the horizontal bracing ring beam and the radiation bracing can cause the wall body of the diaphragm wall 6 to have slower deformation increment.
Referring to fig. 3, the deformation of the diaphragm wall 6 in the first horizontal support removal mode is compared:
and (3) according to the deformation condition of the diaphragm wall 6 under the second horizontal support dismantling mode of model simulation analysis:
the horizontal support large ring beam and the radiation support can cause obvious deformation increment of the wall body of the diaphragm wall 6 when being removed.
Referring to fig. 4, the deformation of the diaphragm wall 6 in the second horizontal strut removal mode is compared:
determining an optimal support dismantling sequence and direction according to different support dismantling sequence simulation calculation results: and adopting a scheme of preferentially breaking the ring support.
The fourth step:
the support dismantling method and sequence of the project are clear as follows:
the dismantling mode is a static dismantling mode, and mechanical dismantling is strictly forbidden;
firstly, removing the supporting plate belt 1 according to the step (1); (2) the large ring brace 2 is uniformly disconnected from four point positions; (3) when the angle brace 7 in each supporting area is dismantled, the angle brace 7 vertical to the ring beam direction is dismantled firstly, and then the angle brace 7 parallel to the ring beam direction is dismantled; (4) dismantling the area (including the splayed brace 4) of the diagonal brace 5; the sequence of (2) is dismantled;
the fifth step:
and after the horizontal support system structure is dismantled, the vertical support structures are dismantled in sequence.
The invention belongs to the technical field of foundation pit concrete inner support dismantling construction methods, is suitable for all construction sites, and is a directional dismantling innovation construction technology which needs to optimize a dismantling scheme when a deep foundation pit concrete horizontal inner support dismantling construction with sensitive surrounding environment (such as near subway operation interval tunnels, cultural relic protection buildings, residential areas and other important buildings) is carried out, ensures slow deformation influence on an engineering envelope structure and surrounding buildings when the horizontal inner support is dismantled, and reduces the influence to the minimum.
The technical function is as follows: the deformation influence on the enclosure structure and the surrounding buildings of the project is ensured to be slow when the horizontal inner support is dismantled, the negative influences of alarming of monitoring data of the surrounding environment, shutdown of the project and the like caused by deformation mutation caused by dismantling the support are avoided, and the safety of the surrounding environment is ensured.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for dismantling an inner support of a foundation pit is characterized by comprising the following steps:
s1, dividing an inner support system into a plurality of areas according to a foundation pit construction area;
s2, trying to enumerate a plurality of horizontal inner support dismantling sequences according to the design of the inner support of the foundation pit;
s3, respectively simulating the dismantling sequence through software, and collecting data of influences of the dismantling sequence on the surrounding environment;
s4, selecting a dismantling sequence with the smallest influence according to the data;
s5: carrying out dismantling according to the selected sequence in a static cutting mode;
and S6, removing the vertical inner support structure after the horizontal inner support is removed.
2. The method for removing the inner support of the foundation pit according to claim 1, wherein: and S2, the multiple horizontal inner support dismantling sequences comprise a horizontal support integral dismantling sequence and a each region corner brace dismantling sequence.
3. The method for removing the inner support of the foundation pit according to claim 2, wherein: the whole dismantling sequence of the horizontal support at least comprises two sequences;
the first method is to dismantle the large ring support; removing the small ring support; dismantling the peripheral radiation support; removing the middle counter stays;
the second is to remove the peripheral radiation support; dismantling the large ring support; removing the small ring support; and (5) dismantling the middle counter stay.
4. The method for removing an inner support of a foundation pit according to claim 2, wherein: each area corner brace dismantling sequence comprises two types;
the first method is that firstly, the corner brace vertical to the ring brace direction is dismantled, and then the corner brace parallel to the ring brace direction is dismantled;
the second method is to remove the angle brace parallel to the ring brace direction and then remove the angle brace perpendicular to the ring brace direction.
5. The method for removing an inner support of a foundation pit according to claim 1, wherein: step S5 and step S6 both include monitoring the foundation pit and the surrounding environment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210898841.3A CN115198765B (en) | 2022-07-28 | 2022-07-28 | Method for dismantling support in foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210898841.3A CN115198765B (en) | 2022-07-28 | 2022-07-28 | Method for dismantling support in foundation pit |
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| CN115198765A true CN115198765A (en) | 2022-10-18 |
| CN115198765B CN115198765B (en) | 2024-05-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117436164A (en) * | 2023-09-26 | 2024-01-23 | 中交第三航务工程局有限公司 | Planning method and planning system for soft soil deep foundation pit earthwork excavation construction scheme |
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| CN113356223A (en) * | 2021-05-14 | 2021-09-07 | 中国建筑第二工程局有限公司 | Asynchronous decoupling construction method for large foundation pit coupling inner support system |
| CN113463653A (en) * | 2021-06-30 | 2021-10-01 | 中建一局集团第五建筑有限公司 | Construction method for dismantling inner support in vertical sectional manner |
| CN113668548A (en) * | 2021-07-28 | 2021-11-19 | 中国建筑一局(集团)有限公司 | Narrow foundation pit ramp supporting structure and construction method |
-
2022
- 2022-07-28 CN CN202210898841.3A patent/CN115198765B/en active Active
Patent Citations (7)
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|---|---|---|---|---|
| JP2001303599A (en) * | 2000-04-19 | 2001-10-31 | Shimizu Corp | Building demolishing and constructing method and building |
| CN106845039A (en) * | 2017-03-21 | 2017-06-13 | 中建三局第建设工程有限责任公司 | Bracing demolition construction method based on BIM |
| CN112030994A (en) * | 2020-09-02 | 2020-12-04 | 大元建业集团股份有限公司 | Deep foundation pit support dismantling method based on dynamo |
| CN113235610A (en) * | 2021-05-13 | 2021-08-10 | 南通大学 | Foundation pit supporting structure of out-pit arched supporting system and construction method thereof |
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| CN113463653A (en) * | 2021-06-30 | 2021-10-01 | 中建一局集团第五建筑有限公司 | Construction method for dismantling inner support in vertical sectional manner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117436164A (en) * | 2023-09-26 | 2024-01-23 | 中交第三航务工程局有限公司 | Planning method and planning system for soft soil deep foundation pit earthwork excavation construction scheme |
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