CN115198765B - Method for dismantling support in foundation pit - Google Patents
Method for dismantling support in foundation pit Download PDFInfo
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- CN115198765B CN115198765B CN202210898841.3A CN202210898841A CN115198765B CN 115198765 B CN115198765 B CN 115198765B CN 202210898841 A CN202210898841 A CN 202210898841A CN 115198765 B CN115198765 B CN 115198765B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010276 construction Methods 0.000 claims abstract description 15
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 230000003068 static effect Effects 0.000 claims abstract description 5
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 3
- 238000005192 partition Methods 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 abstract 1
- 239000004567 concrete Substances 0.000 description 7
- 238000004088 simulation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 235000015141 kefir Nutrition 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
- 238000005457 optimization Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
Classifications
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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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention provides a method for dismantling a support in a foundation pit, which belongs to the technical field of dismantling construction of the support in the foundation pit, and comprises the following steps: dividing an inner support system into a plurality of areas according to a foundation pit construction area; attempts to enumerate a variety of horizontal inner support removal sequences; respectively simulating the dismantling sequence through software, and collecting data of influence of the dismantling sequence on the surrounding environment; selecting a removal sequence with minimal impact; performing dismantling according to the selected sequence by a static cutting mode; and after the horizontal inner support is removed, removing 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 by software, and the horizontal support dismantling sequence is optimized according to the overall thought of partition dismantling and dismantling sequence and reinforcing monitoring; the safety of the subway operation section tunnel, the text-protection building and the residential building during the support disassembly 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
Along with the continuous development of infrastructure construction and the continuous improvement of people's demand, the construction position of foundation ditch project is close to subway section tunnel, cultural relic protection building, residential area etc. and deep basal pit engineering also becomes greater to the deformation influence of surrounding environment in the work progress to make deep basal pit engineering to the protection requirement of surrounding environment higher and higher during each process construction.
Because of more and more project centers on the market, in order to meet the deformation requirements of underground construction (architecture) buildings, such as subways, residential area buildings and the like, which are sensitive to deformation abnormality, a horizontal support system is mostly selected from reinforced concrete inner supports, and the deformation influence on foundation pit support structures, subway section tunnels and peripheral buildings during the traditional support dismantling process is large. The foundation pit is ultra-deep, the internal force of the concrete horizontal support is large, and if the internal force of the horizontal support is slowly and directionally released without adopting a targeted dismantling scheme, the foundation pit support structure and the surrounding environment are greatly influenced.
For example, the engineering project for reconstructing and expanding the original site of the gynaecology and obstetrics hospital in Tianjin city is located in Tianjin city and peace district barrage 146, and the surrounding environment is complex: the north side is close to a western kefir church cultural relic protection building, and the south side is close to a subway No. 3 line ying-xi interval operation line. The engineering is deep foundation pit engineering, and the supporting system structure is 'underground diaphragm wall + two concrete horizontal internal supports (circular ring supports + opposite supports are adopted in the supporting mode)', so that not only is foundation pit safety ensured, but also normal operation of surrounding subways is ensured, and difficulty is high.
Disclosure of Invention
In view of the foregoing, the present invention is directed to a method for removing a support in a foundation pit, so as to alleviate the above-mentioned technical problems.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the dismantling method of the support in the 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, according to the design of the support in the foundation pit, trying to enumerate a plurality of horizontal support dismantling sequences;
s3, respectively simulating the dismantling sequence through software, and collecting data of influence of the dismantling sequence on the surrounding environment;
s4, selecting a dismantling sequence with the least influence according to the data;
S5: performing dismantling according to the selected sequence by a static cutting mode;
and S6, after the horizontal inner support is removed, removing the vertical inner support structure.
Further, the plurality of horizontal internal support removal sequences in step S2 includes a horizontal support overall removal sequence and a per-zone gusset removal sequence.
Further, the horizontal support overall dismantling sequence at least comprises two types;
The first is to dismantle the large ring support; removing the small ring support; dismantling the peripheral radiation support; removing the middle pair support;
the second is to remove the peripheral radiation support; removing the large ring support; removing the small ring support; and removing the middle pair of supports.
Further, each zone gusset removal sequence includes two;
the first is to remove the angle brace in the vertical ring support direction firstly, and then remove the angle brace in the parallel ring support direction;
and the second is to remove the angle brace in the parallel ring support direction and then remove the angle brace in the vertical ring support direction.
Further, both the step S5 and the step S6 include monitoring the foundation pit and the surrounding environment.
Compared with the prior art, the method for dismantling the support in the foundation pit has the following advantages:
1. The invention avoids the problems that the deformation value is suddenly changed during the dismantling of the traditional concrete horizontal inner support to cause data alarm, site shutdown, influence on the safety of the surrounding environment and the like because the dismantling sequence is not optimized during the dismantling of the support; the deformation influence of the horizontal support is simulated by optimizing the horizontal support dismantling sequence and software, and the horizontal support is dismantled according to the overall thought of partition dismantling, dismantling sequence optimization and reinforcement monitoring; the safety of the subway operation section tunnel, the text-protection building and the residential building during the support disassembly period is ensured.
2. According to the invention, the demolishing construction is divided according to the regions, and each region is constructed in sequence according to the optimized demolishing sequence, so that the flow construction operation can be formed, the construction progress is quickened, and the materials are saved, and the method is scientific and reasonable.
3. When the support is dismantled from the concrete, the tray buckle frame body is adopted to support the bottom, so that the pulling action of the support system and the enclosure system at the moment of dismantling the local components is avoided.
4. And during the horizontal support dismantling period of the concrete, all static force (rope saw) cutting modes are adopted, so that the safety of surrounding environments such as subway operation areas and the like during the support dismantling period is greatly ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of the overall structure of a foundation pit inner support according to the present invention;
FIG. 2 is a schematic view of the horizontal support of the present invention removed;
FIG. 3 is a schematic diagram showing the effect of the first support removal sequence on deformation of the enclosure;
FIG. 4 is a graph showing the effect of the second support removal sequence on the deformation of the enclosure.
Reference numerals illustrate:
1-a support plate belt; 2-large ring support; 3-small ring support; 4-splayed support; 5-bracing; 6-connecting the ground wall; 7-corner brace.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be the communication of units in two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1 and 2, the invention provides a method for dismantling a support in a foundation pit, which comprises the following steps: the first step: reasonably planning and dismantling a construction sequence, dividing an inner support system into 5 areas according to a foundation pit construction area, wherein the areas comprise an area A, an area B, an area C, an area D and a opposite support 5 area (comprising a splayed support 4);
And a second step of: optimizing the dismantling sequence of the support rods according to the overall support design profile of the engineering foundation pit; according to engineering support member types, analyzing the surrounding environment condition of the foundation pit, and integrally dividing the horizontal support dismantling sequence into two types:
The first horizontal support removal sequence is as follows: ① Breaking the large ring support 2; ② Breaking the small ring support 3; ③ Sequentially breaking the peripheral radiation struts; ④ And finally, the middle pair of supports 5 is removed.
Second order of removal of horizontal supports: ① Sequentially breaking the peripheral radiation struts; ② Breaking the large ring support 2; ③ Breaking the small ring support 3; ④ And finally, the middle pair of supports 5 is removed.
And a third step of:
model establishment is carried out on different dismantling sequences through software, and deformation data acquisition and analysis are carried out on influences of surrounding environments such as an enclosure structure, a subway tunnel and the like;
and analyzing the deformation condition of the underground diaphragm wall 6 in the first horizontal support dismantling mode according to the model simulation:
both the horizontally supported large ring beams and the radiation struts can lead to slower deformation increment of the wall body of the diaphragm wall 6.
Referring to fig. 3, the deformation of the diaphragm wall 6 in the first horizontal support removal mode is compared with that:
And (3) according to the model simulation, analyzing the deformation condition of the diaphragm wall 6 in the second horizontal support dismantling mode:
The horizontal bracing large ring beam and the radial bracing can lead to obvious deformation increment of the wall body of the diaphragm wall 6 when the horizontal bracing large ring beam and the radial bracing are dismantled.
Referring to fig. 4, the deformation of the diaphragm wall 6 in the second horizontal support removing mode is compared with that of:
according to simulation calculation results of different support removing sequences, determining the optimal support removing sequence and direction: the scheme of preferentially breaking the ring support is adopted.
Fourth step:
the method and the sequence for removing the engineering support are defined 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 ①; ② The four points of the large ring support 2 are evenly disconnected; ③ When the angle brace 7 in each supporting area is removed, firstly removing the angle brace 7 in the vertical ring beam direction, and then removing the angle brace 7 in the parallel ring beam direction; ④ Removing the opposite bracing 5 region (comprising the splayed bracing 4); is removed in sequence;
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 construction methods for dismantling foundation pit concrete inner supports, and is suitable for all building construction sites, in particular to a directional dismantling innovative construction technology which is used for optimizing a dismantling support scheme when deep foundation pit concrete horizontal inner supports with relatively sensitive surrounding environments (such as tunnels adjacent to subway operation regions, cultural relics protecting buildings, residential areas and other important buildings) are dismantled, ensuring that deformation influence on engineering enclosing structures and surrounding buildings is slow when the horizontal inner supports are dismantled, and minimizing the influence.
The technical function is as follows: the deformation influence on the engineering enclosure structure and surrounding buildings is slow when the horizontal inner support is detached, the negative influence on surrounding environment monitoring data alarm, project shutdown and the like caused by deformation mutation caused by detachment of the support is avoided, and the safety of the surrounding environment is ensured.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (3)
1. The method for dismantling the support in the foundation pit is characterized by comprising the following steps of:
S1, dividing an inner support system into a plurality of areas according to a foundation pit construction area;
s2, according to the design of the support in the foundation pit, enumerating a plurality of horizontal support dismantling sequences;
the plurality of horizontal internal support dismantling sequences in the step S2 comprise a horizontal support overall dismantling sequence and a corner support dismantling sequence of each area;
The horizontal support overall dismantling sequence comprises at least two types;
The first is to dismantle the large ring support; removing the small ring support; dismantling the peripheral radiation support; removing the middle pair support;
the second is to remove the peripheral radiation support; removing the large ring support; removing the small ring support; removing the middle pair support;
s3, respectively simulating the dismantling sequence through software, and collecting data of influence of the dismantling sequence on the surrounding environment;
s4, selecting a dismantling sequence with the least influence according to the data;
S5: performing dismantling according to the selected sequence by a static cutting mode;
and S6, after the horizontal inner support is removed, removing the vertical inner support structure.
2. The method of removing a foundation pit support of claim 1, wherein: each regional gusset removal sequence includes two;
the first is to remove the angle brace in the vertical ring support direction firstly, and then remove the angle brace in the parallel ring support direction;
and the second is to remove the angle brace in the parallel ring support direction and then remove the angle brace in the vertical ring support direction.
3. The method of removing a foundation pit support of claim 1, wherein: step S5 and step S6 each 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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| CN202210898841.3A CN115198765B (en) | 2022-07-28 | 2022-07-28 | Method for dismantling support in foundation pit |
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| CN115198765A CN115198765A (en) | 2022-10-18 |
| CN115198765B true CN115198765B (en) | 2024-05-14 |
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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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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