CN115787671A - Large foundation pit engineering support changing method - Google Patents
Large foundation pit engineering support changing method Download PDFInfo
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- CN115787671A CN115787671A CN202310016860.3A CN202310016860A CN115787671A CN 115787671 A CN115787671 A CN 115787671A CN 202310016860 A CN202310016860 A CN 202310016860A CN 115787671 A CN115787671 A CN 115787671A
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- force transmission
- bottom plate
- transmission belt
- floor
- floor slab
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 50
- 239000010959 steel Substances 0.000 claims abstract description 50
- 230000005540 biological transmission Effects 0.000 claims abstract description 47
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 29
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 27
- 238000009435 building construction Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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Abstract
The invention relates to the technical field of building construction, in particular to a support changing method for large foundation pit engineering supports; the method comprises the following steps: building an internal support structure system and arranging an enclosure; laying a reinforcing steel bar of the bottom plate and the bottom plate support replacing body, and reserving a bottom plate post-cast strip; arranging a first steel force transmission belt in the bottom plate post-cast strip; integrally pouring and forming the bottom plate and the bottom plate support replacing body; pouring an outer wall and a main beam of the construction structure; laying floor slab reinforcing steel bars and floor slab force transmission belt reinforcing steel bars, and reserving a floor slab post-cast strip; a second steel force transmission belt is arranged in the floor post-cast strip; pouring a floor slab and a floor slab force transmission belt; and (4) removing the internal support structure system. The support changing method is simple in integral construction, the construction period is shortened, the cost is saved, the integral rigidity between the support changing and the enclosure body is improved, the section steel can be circulated, and the concrete quality and strength can be effectively guaranteed; a steel force transmission belt is arranged in the post-cast strip, and stress can be reasonably transferred and distributed after the support is dismantled; the floor slab force transmission belt is as thick as the floor slab, and is integrally poured and convenient to construct.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a support replacing method for large foundation pit engineering supports.
Background
In the construction of large-scale foundation pit engineering, an inner support structure system is usually required to be erected as a support for the construction of a basement building main body, such as a support steel pipe, a steel arch frame, a steel grating and the like; however, these internal support structure systems often affect the subsequent construction of the engineering, and therefore, certain technical measures are required to gradually replace the internal support structure system which plays a role in temporary support, so that after the temporary internal support is removed, the engineering can be safely and qualitatively continued, that is, the support replacement construction is performed, and the stress is orderly adjusted and safely transferred and distributed.
The support changing construction is an important process before the support structure system serving as a foundation pit support is removed, the strength and the construction period of the support changing construction have important influence on the removal of the inner support structure system, the traditional support changing construction is biased to safety consideration, the number of the process steps of the construction process is large, the construction cost control and the construction period saving are not facilitated, and meanwhile, the support changing construction is also carried out without considering the uneven stress distribution after the support is removed at a post-cast strip.
Disclosure of Invention
The invention provides a large foundation pit engineering support changing method aiming at the technical problems that in the prior art, support changing construction is biased to safety consideration, the construction process is multiple, cost control and construction period saving are not facilitated, and meanwhile, support changing construction technology is not required to be carried out after stress distribution is not uniform after supports are dismantled at a post-cast strip.
In order to achieve the purpose, the invention adopts the technical scheme that: a large foundation pit engineering support changing method comprises the following steps:
step one, building an inner support structure system in a foundation pit, and arranging a guard body;
secondly, laying a bottom plate and a reinforcing steel bar of the bottom plate support replacing body, wherein one end of the reinforcing steel bar of the bottom plate support replacing body is erected on the reinforcing steel bar of the bottom plate, and the other end of the reinforcing steel bar of the bottom plate support replacing body is connected with the enclosure body; reserving a bottom plate post-cast strip when laying the steel bars of the bottom plate;
arranging a first steel force transmission belt in the bottom plate post-cast strip, wherein two ends of the first steel force transmission belt are respectively connected with the steel bars of the bottom plates on two sides of the bottom plate post-cast strip;
step four, integrally pouring a formed bottom plate and a bottom plate support replacing body;
fifthly, pouring the outer wall and the structural girder of the construction structure, pouring the outer wall of the structure with the same height according to the depth of the basement, and arranging a multi-layer structural girder in the outer wall of the structure according to the number of the layers of the basement;
laying reinforcing steel bars of a floor slab on two sides of the structural main beam, laying reinforcing steel bars of a floor slab force transmission belt on the outer side of the structural main beam, wherein one end of each reinforcing steel bar of the floor slab force transmission belt is connected with the structural main beam and the outer floor slab thereof, and the other end of each reinforcing steel bar is connected with the enclosure; reserving a floor post-cast strip when laying the steel bars of the floor;
seventhly, arranging a second steel force transmission belt in the floor slab post-cast strip, wherein two ends of the second steel force transmission belt are respectively connected with the steel bars of the floor slabs on two sides of the floor slab post-cast strip;
eighthly, pouring a floor slab and a floor slab force transmission belt; repeating the steps from six to eight according to the number of the layers of the basement;
and step nine, when the strength of the concrete to be poured meets the requirement, removing the internal support structure system.
Preferably, in the sixth step, the steel bars of the floor force transmission belt are connected with the floor main bars of the floor.
Preferably, the thickness of the floor slab force transmission belt is the same as that of the floor slab.
Preferably, the depth of the two ends of the first steel force transmission belt penetrating into the bottom plate in the third step is more than or equal to 500mm.
Preferably, the depth of the two ends of the second steel force transmission belt penetrating into the floor slab in the seventh step is more than or equal to 500mm.
Preferably, both ends of the first steel force transmission belt and both ends of the second steel force transmission belt are provided with end plates.
Compared with the prior art, the invention has the advantages and positive effects that: (1) The support changing method is simple in overall construction, the construction period is shortened, the cost is saved, the overall rigidity between the support changing and the enclosure body is improved through improvement of the support changing construction process, so that a foundation pit enclosure system is firmer, meanwhile, the material source requirement is low, industrial production can be realized, section steel can be circulated, and the concrete quality and strength can be effectively guaranteed; (2) Arranging a steel force transmission belt in the bottom plate post-cast strip and the floor post-cast strip, and reasonably transferring and distributing stress energy after removing the support at the post-cast strip; (3) The thickness of floor power transmission belt is the same as the thickness of the floor, and the floor is integrally poured during pouring, so that the construction is convenient.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced,
FIG. 1 is a top view of a bottom plate support change construction;
FIG. 2 is a top view of a floor slab force transfer belt construction;
FIG. 3 is a side cross-sectional view of a floor slab force transfer belt construction;
FIG. 4 is a cross-sectional view of a first steel force transfer belt in a bottom plate post-cast strip;
figure 5 is a cross-sectional view of a second steel force transfer strip in a post-cast floor slab.
Description of reference numerals:
1-an enclosure;
2-structural exterior walls; 21-a structural main beam;
3-bottom plate, 31-bottom plate post-cast strip;
4-floor, 41-floor post-cast strip and 42-floor main reinforcement;
5, replacing a support body for the bottom plate;
6-floor slab force transmission belt;
71-first steel force transfer belt, 72-second steel force transfer belt, 73-end plate.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein and, therefore, the present invention is not limited to the specific embodiments disclosed in the following description.
Examples
The invention is further explained by combining the attached figures 1-5, and the method for replacing the support of the large foundation pit engineering support comprises the following steps:
step one, an inner support structure system is erected in a foundation pit, an enclosure body 1 is arranged, and the enclosure body 1 surrounds the side wall of the basement for a circle.
Secondly, laying the reinforcing steel bars of the bottom plate 3 and the bottom plate support replacing body 5, wherein one end of the reinforcing steel bar of the bottom plate support replacing body 5 is overlapped on the reinforcing steel bar of the bottom plate 3, and the other end of the reinforcing steel bar is connected with the enclosure body 1; reserving a bottom plate post-cast strip 31 when the steel bars of the bottom plate 3 are laid;
the bottom plate 3 is located basement foundation ditch bottom enclosure 1, and the bottom plate trades the setting of supporter 5 and is being equipped with a plurality ofly along the periphery between enclosure 1 bottom plate 3, sets up a week, every interval 8400mm.
And thirdly, arranging a first steel force transmission belt 71 which is 28a I-shaped steel and 1800mm long in the bottom plate post-cast strip 31, arranging end plates 73 at two ends of the first steel force transmission belt 71, and enabling two ends of the first steel force transmission belt 71 to respectively penetrate into the bottom plates 3 at two sides of the bottom plate post-cast strip 31 and be connected with the steel bars of the bottom plates 3, wherein the penetration depth is 500mm.
And step four, integrally pouring the formed bottom plate 3 and the bottom plate support replacing body 5.
And fifthly, pouring the structural outer wall 2 and the structural main beams 21, pouring the structural outer wall 2 with the same height according to the depth of the basement, and arranging the structural main beams 21 with the same number of layers in the structural outer wall 2 according to the number of layers of the basement.
Sixthly, laying reinforcing steel bars of the floor slabs 4 on two sides of the structural main beam 21, laying reinforcing steel bars of the floor slab force transmission belts 6 on the outer sides of the structural main beam 21, connecting one ends of the reinforcing steel bars of the floor slab force transmission belts 6 with the structural main beam 21 and floor slab main reinforcements 42 of the floor slabs 4 on the outer sides of the structural main beam, and connecting the other ends of the reinforcing steel bars with the enclosure body 1; a floor post-cast strip 41 is reserved when the steel bars of the floor 4 are laid; the thickness of the floor slab force transmission belt 6 is the same as that of the floor slab 4; the floor slab force transmission belts 6 are arranged along the periphery of the floor slab 4 in a circle at intervals of 8400mm, and the width of each force transmission belt 6 is 3000mm.
Seventhly, arranging a second steel force transmission belt 72 which is 12.6I-shaped steel and 1800mm long in the floor slab post-cast strip 41, wherein end plates 73 are arranged at two ends of the second steel force transmission belt 72; the two ends of the second steel force transmission belt 72 respectively extend into the floor slabs 4 on the two sides of the floor slab post-cast strip 41 and are connected with the steel bars of the floor slabs 4, and the depth of the extension is more than or equal to 500mm.
Eighthly, pouring a floor slab 4 and a floor slab force transmission belt 6; and repeating the steps from six to eight according to the number of the layers of the basement.
And step nine, when the strength of the concrete to be poured reaches 80% of the design strength, removing the inner support structure system.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may apply the above-mentioned technical details to other fields by using the equivalent embodiments with equivalent changes or modifications, but any simple modification and equivalent changes made to the above embodiments according to the technical spirit of the present invention may still fall within the protection scope of the technical solution of the present invention.
Claims (6)
1. A support replacing method for large foundation pit engineering support is characterized by comprising the following steps:
step one, an inner support structure system is erected in a foundation pit, and a guard body (1) is arranged;
secondly, laying a bottom plate (3) and a reinforcing steel bar of the bottom plate support replacing body (5), wherein one end of the reinforcing steel bar of the bottom plate support replacing body (5) is overlapped on the reinforcing steel bar of the bottom plate (3), and the other end of the reinforcing steel bar is connected with the enclosure body (1); reserving a bottom plate post-cast strip (31) when the steel bars of the bottom plate (3) are laid;
thirdly, arranging a first steel force transmission belt (71) in the bottom plate post-cast strip (31), wherein two ends of the first steel force transmission belt (71) respectively penetrate into the bottom plates (3) on two sides of the bottom plate post-cast strip (31) and are connected with steel bars of the bottom plates (3);
step four, integrally pouring and forming a bottom plate (3) and a bottom plate support replacing body (5);
fifthly, pouring the structural outer wall (2) and the structural main beam (21), pouring the structural outer wall (2) with the same height according to the depth of the basement, and arranging a multi-layer structural main beam (21) in the structural outer wall (2) according to the number of the floors of the basement;
sixthly, laying reinforcing steel bars of the floor slabs (4) on two sides of the structural main beam (21), laying reinforcing steel bars of the floor slab force transmission belts (6) on the outer sides of the structural main beam (21), connecting one ends of the reinforcing steel bars of the floor slab force transmission belts (6) with the structural main beam (21) and the outer side floor slabs (4) of the structural main beam, and connecting the other ends of the reinforcing steel bars with the enclosure body (1); reserving a floor post-cast strip (41) when the steel bars of the floor (4) are laid;
seventhly, arranging a second steel force transmission belt (72) in the floor slab post-cast strip (41), wherein two ends of the second steel force transmission belt (72) respectively penetrate into the floor slabs (4) on two sides of the floor slab post-cast strip (41) and are connected with steel bars of the floor slabs (4);
eighthly, pouring the floor (4) and the floor force transmission belt (6); repeating the steps from six to eight according to the number of the layers of the basement;
and step nine, when the strength of the concrete to be poured meets the requirement, removing the inner support structure system.
2. The large foundation pit engineering support replacing and shoring method according to claim 1, wherein in the sixth step, the reinforcing steel bars of the floor force transmission belt (6) are connected with the floor main reinforcing steel bars (42) of the floor (4).
3. The large foundation pit engineering bracing replacing method according to claim 2, wherein the thickness of the floor slab force transmission belt (6) is the same as that of the floor slab (4).
4. The method for supporting and replacing the large foundation pit engineering according to any one of claims 1 to 3, wherein the depth of the two ends of the first steel force transmission belt (71) penetrating into the bottom plate (3) in the third step is more than or equal to 500mm.
5. The support replacing and supporting method for the large foundation pit engineering according to claim 4, wherein in the seventh step, the depths of the two ends of the second steel force transmission belt (72) penetrating into the floor slab (4) are both more than or equal to 500mm.
6. The support replacing and supporting method for the large foundation pit engineering according to claim 5, wherein end plates (73) are arranged at two ends of the first steel force transmission belt (71) and two ends of the second steel force transmission belt (72).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310016860.3A CN115787671A (en) | 2023-01-06 | 2023-01-06 | Large foundation pit engineering support changing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310016860.3A CN115787671A (en) | 2023-01-06 | 2023-01-06 | Large foundation pit engineering support changing method |
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| Publication Number | Publication Date |
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| CN115787671A true CN115787671A (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310016860.3A Pending CN115787671A (en) | 2023-01-06 | 2023-01-06 | Large foundation pit engineering support changing method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603359A (en) * | 2013-11-14 | 2014-02-26 | 明业建设集团有限公司 | Deep foundation pit diagonal bracing support structure demolition method |
| CN111074905A (en) * | 2020-01-10 | 2020-04-28 | 广西建工集团联合建设有限公司 | Early-dismantling structure and construction method for bottom layer support beam of inner support system of deep foundation pit |
| CN111456025A (en) * | 2020-04-09 | 2020-07-28 | 中建八局天津建设工程有限公司 | Combined support replacing and dismantling construction method for ultra-deep foundation pit |
| WO2021196450A1 (en) * | 2020-03-31 | 2021-10-07 | 江苏东合南岩土科技股份有限公司 | Construction method for underground prestressed supporting structure |
| CN215594042U (en) * | 2021-06-04 | 2022-01-21 | 中国建筑第八工程局有限公司 | Force transmission belt for underground structure back building |
| CN217870523U (en) * | 2022-08-20 | 2022-11-22 | 广东省构建工程建设有限公司 | Deep and large foundation pit ring beam inner supporting structure of post-cast strip type steel dowel bar |
-
2023
- 2023-01-06 CN CN202310016860.3A patent/CN115787671A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603359A (en) * | 2013-11-14 | 2014-02-26 | 明业建设集团有限公司 | Deep foundation pit diagonal bracing support structure demolition method |
| CN111074905A (en) * | 2020-01-10 | 2020-04-28 | 广西建工集团联合建设有限公司 | Early-dismantling structure and construction method for bottom layer support beam of inner support system of deep foundation pit |
| WO2021196450A1 (en) * | 2020-03-31 | 2021-10-07 | 江苏东合南岩土科技股份有限公司 | Construction method for underground prestressed supporting structure |
| CN111456025A (en) * | 2020-04-09 | 2020-07-28 | 中建八局天津建设工程有限公司 | Combined support replacing and dismantling construction method for ultra-deep foundation pit |
| CN215594042U (en) * | 2021-06-04 | 2022-01-21 | 中国建筑第八工程局有限公司 | Force transmission belt for underground structure back building |
| CN217870523U (en) * | 2022-08-20 | 2022-11-22 | 广东省构建工程建设有限公司 | Deep and large foundation pit ring beam inner supporting structure of post-cast strip type steel dowel bar |
Non-Patent Citations (2)
| Title |
|---|
| 孔德森等, 冶金工业出版社 * |
| 黄华昌: "基坑内支撑换撑技术的应用" * |
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Application publication date: 20230314 |
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