CN114411757A - Early-dismantling construction method for inner support partition of deep foundation pit - Google Patents
Early-dismantling construction method for inner support partition of deep foundation pit Download PDFInfo
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- CN114411757A CN114411757A CN202210117188.2A CN202210117188A CN114411757A CN 114411757 A CN114411757 A CN 114411757A CN 202210117188 A CN202210117188 A CN 202210117188A CN 114411757 A CN114411757 A CN 114411757A
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- 238000010276 construction Methods 0.000 title claims abstract description 39
- 238000005192 partition Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims description 6
- 238000011065 in-situ storage Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 abstract description 5
- 238000005266 casting Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 235000013372 meat Nutrition 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009435 building construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 235000013311 vegetables Nutrition 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
Abstract
The invention discloses an inner support partition early-dismantling construction method of a deep foundation pit, wherein a box type back-jacking inclined strut is arranged at a post-pouring belt pouring space position below three inner supports in the middle of the deep foundation pit and connected with a basement structure, the box type back-jacking inclined strut is connected with the inner support and forms a certain included angle, and the box type back-jacking inclined strut is integrally formed into a triangular support back-jacking shape through welding an upper buried plate and a lower buried plate, so that partition dismantling and quick dismantling of the inner support of the deep foundation pit are realized, the construction efficiency of the basement structure is improved, and the construction period is shortened. The invention solves the problem that the traditional foundation pit inner support pair beam can be dismantled only after the concrete structure of the basement is completely constructed and the design strength is reached, so that the engineering construction period is long.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to an early dismantling construction method for an inner support subarea of a deep foundation pit.
Background
The traditional premise that the support beam is dismantled through the inner support in the basement is that after the whole construction of a basement concrete structure is completed and the design strength is reached, the support beam can be dismantled through the inner support, and therefore the problem that the engineering construction period is long exists.
Disclosure of Invention
In order to overcome the defects in the prior art, the inner support partition early-dismantling construction method for the deep foundation pit is provided so as to solve the problem that the traditional foundation pit inner support dismantling method for the support beam needs to be completed in the whole construction of the basement concrete structure and can be dismantled after the design strength is reached, so that the engineering construction period is long.
In order to achieve the aim, the inner support partition early-dismantling construction method of the deep foundation pit comprises the following steps:
a. after an inner support is constructed in a supporting structure of a deep foundation pit, a beam slab structure of a basement is constructed below the inner support, the number of the inner supports is multiple, the multiple inner supports are arranged at intervals along a first horizontal direction, when the beam slab structure is constructed, the beam slab structure is divided into multiple pouring areas along the first horizontal direction, and a post-pouring belt pouring space is formed between every two adjacent pouring areas;
b. sequentially pouring a plurality of pouring areas, wherein after the beam plate structure of the pouring area is poured below a second internal support, after the concrete strength of the beam plate structure below the second internal support reaches the design requirement, a plurality of box-type back-jacking inclined struts are arranged between the second internal support and the beam plate structure below the second internal support, the strength of which reaches the design requirement;
c. after a plurality of box-type back-jacking inclined struts are installed, the first inner support is dismantled;
d. and c, repeating the steps b to c, completing the pouring of the beam slab structures of the rest pouring areas in sequence, and removing the rest inner supports one by one.
Furthermore, a support column is buried in the deep foundation pit, the support column is supported on the inner support, and the upper end of the box-type back-jacking inclined support is connected to the intersection of the support column and the inner support.
Furthermore, when the supporting column is poured, an upper embedded plate is embedded in the supporting column, when a beam plate structure below the inner support is poured for the second time, a lower embedded plate is embedded in the upper portion of the beam plate structure below the inner support for the second time, when the box type back-jacking inclined strut is installed, the upper end of the box type back-jacking inclined strut is installed on the upper embedded plate, and the lower end of the box type back-jacking inclined strut is installed on the lower embedded plate.
Furthermore, a plurality of box-type back-jacking inclined struts are arranged on one side, facing the first-channel inner support, of the inner support.
Further, the first channel inner support is a plate support.
Furthermore, the supporting structure comprises a plurality of cast-in-situ bored piles arranged along the circumferential direction of the deep foundation pit.
The construction method has the advantages that the box-type back-up inclined strut is arranged at the post-pouring belt pouring space position below the bracing beam area (the three inner supports in the middle of the deep foundation pit), the box-type back-up inclined strut is connected with the basement structure, the box-type back-up inclined strut is connected with the inner support and forms a certain included angle, and the box-type back-up inclined strut is integrally formed into a triangular support back-up shape through welding the upper buried plate and the lower buried plate, so that the support is removed in a subarea manner and is quickly removed in the deep foundation pit, the construction efficiency of the basement structure is improved, and the construction period is shortened.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an early-dismantling construction method for an inner support partition of a deep foundation pit according to an embodiment of the present invention.
FIG. 2 is an enlarged schematic view of an end of the inner support in the second pass of an embodiment of the present invention.
Fig. 3 is a schematic structural view of a box-type back-up diagonal brace according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a lower buried plate according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an upper buried plate according to an embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 to 5, the invention provides an early dismantling construction method for an inner support partition of a deep foundation pit, which comprises the following steps:
a. after 3 supports in the supporting construction 1 of deep basal pit, in support 3 below construction basement's beam slab structure 5 in, the quantity of support 3 is the multichannel, multichannel support 3 along first horizontal direction interval setting, in the construction during beam slab structure 5, follow first horizontal direction will beam slab structure 5 divide into a plurality of casting area 2, adjacent two form the post-cast strip between the casting area 2 and pour space 21.
Specifically, the area of the deep foundation pit is about 4.63 ten thousand meters2The absolute elevation of the top of the deep foundation pit is 84.7-86.0 m, the length of the deep foundation pit is 346m, the width of the deep foundation pit is 136m, and the depth of the deep foundation pit reaches 20.46 m. In the vertical direction of the deep foundation pit, the number of the inner supports is three, and the central absolute elevations of the inner supports are 82.90m, 77.40m and 72.80m respectively. And in the horizontal direction, five inner supports are arranged in the deep foundation pit, wherein three opposite supporting beams are arranged in the middle of the deep foundation pit. Two ends of the deep foundation pit are respectively provided with a plate support, namely a first inner support and a last inner support are plate supports. The two plate supports are respectively arranged on two opposite sides of the three opposite supporting beams. Each opposite supporting beam is arranged along the width direction of the deep foundation pit. The three opposite supporting beams are arranged along the length direction of the deep foundation pit.
In this embodiment, the inner support is a steel support. After the internal support is subsequently removed, the internal support can be repeatedly used.
In the present embodiment, the supporting structure 1 includes a plurality of cast-in-situ bored piles arranged in the circumferential direction of the deep foundation pit. The plurality of cast-in-situ bored piles comprise meat piles and vegetable piles which are alternately arranged and meshed together. Wherein the concrete label of the meat pile (the cast-in-place pile with the steel reinforcement cage) is C30; plain piles (cast-in-place piles without reinforcement cages) concrete No. C20, are arranged in a meshing manner, and have a pile length of 26.76 m.
And after the inner support construction is finished, constructing a beam-slab structure of the basement structure. Wherein, the construction of beam slab structure divides the regional construction. Specifically, the beam-slab structure 5 is divided into a plurality of casting areas 2 along a first horizontal direction. In this embodiment, the first horizontal direction is a longitudinal direction of the deep foundation pit. A post-cast strip casting space 21 is formed between two adjacent casting areas 2. The three middle inner supports correspond to a post-cast strip casting space respectively, and the three middle inner supports of the deep foundation pit respectively span the upper part of the post-cast strip casting space (as shown in fig. 1).
b. And sequentially pouring a plurality of pouring areas 2, wherein after the beam plate structure 5 of the pouring area 2 is poured below the second-channel inner support 3, after the concrete strength of the beam plate structure 5 below the second-channel inner support 3 reaches the design requirement, a plurality of box type back-jacking inclined struts are arranged between the second-channel inner support 3 and the beam plate structure 5 below the second-channel inner support 3, wherein the strength of the beam plate structure below the second-channel inner support 3 reaches the design requirement.
When a pouring area of the beam slab structure is poured, after the pouring area below the second-channel inner support is poured, and after concrete in the pouring area is hardened to reach design hardness, the lower end of the box-type back-jacking inclined strut is installed on the concrete in the pouring area, and the upper end of the box-type back-jacking inclined strut is installed on the second-channel inner support above the pouring area.
In the present embodiment, the support columns 31 are embedded in the deep foundation pit. The support column 31 is supported by the inner support 3. The upper end of the box-type back-jacking inclined strut is connected to the intersection of the supporting column 31 and the inner support 3.
As a preferred embodiment, a plurality of box-type back-up braces are provided on the side of the inner support 3 facing the first lane inner support 3.
Specifically, when the support column 31 is poured, the upper buried plate 311 is buried in the support column 31, when the beam slab structure 5 below the second-way inner support 3 is poured, the lower buried plate 51 is buried in the upper portion of the beam slab structure 5 below the second-way inner support 3, when the box-type back-up diagonal support is installed, the upper end of the box-type back-up diagonal support is installed on the upper buried plate 311, and the lower end of the box-type back-up diagonal support is installed on the lower buried plate 51.
After the concrete strength of the beam-slab structure of the pouring area reaches design requirements, paying off and positioning are carried out on the inner supporting beam according to drawing design, and chemical anchor bolt implanting is carried out. After the implantation of the bolt, sampling and drawing detection are carried out on the implanted chemical anchor bolt. And after the detection is qualified, installing an upper buried plate (a rear steel plate).
And determining the size of the box-type back-up inclined strut through design calculation and performing machining prefabrication. And the lower embedded plate on the beam plate structure and the upper embedded plate on the inner support are connected through the box-type back-jacking inclined strut by adopting a welding mode and full-welding the periphery.
c. After a plurality of box-type back-jacking inclined struts are installed, the first inner support 3 is removed.
The post-cast strip that is in the below to propping the roof beam region (the three internal support at the middle part of deep basal pit) and pours spatial position and sets up box back-pushing bracing, box back-pushing bracing links to each other with the basement structure, box back-pushing bracing links to each other and becomes certain contained angle with interior support simultaneously, box back-pushing bracing forms the back-pushing form through last buried plate and lower buried plate welding integration, and then realize that the subregion in the deep basal pit tears open and props, tears open fast and prop, improves the efficiency of construction of basement structure, reduction of erection time.
d. And c, repeating the steps b to c, pouring the beam plate structures 5 of the rest pouring areas 2 in sequence, and removing the rest inner supports 3 one by one.
The process flow of the construction method for early dismantling the inner support subarea of the deep foundation pit comprises the following steps: and embedding a lower embedded plate on the surface of the beam-slab structure of the casting advanced construction area, and then casting the beam-slab structure of the advanced construction area. And then an upper buried plate is arranged on the inner support in the previous construction area. After concrete of a beam-slab structure of a construction area is hardened in advance, a rear steel plate is installed at the upper end of the box type back-jacking inclined strut, and a lower buried plate is welded at the lower end of the box type back-jacking inclined strut. And after the hardness of the beam slab structure meets the design strength, removing the inner support in the previous construction area, and transferring the inner support to the next process.
The construction method for early dismantling the inner support subarea of the deep foundation pit has the advantages that the construction process is simple, the operability is strong, the dismantling support is intervened in advance through the subarea dismantling support, the inner support dismantling period is effectively shortened, the inner support is a steel support and can be recycled, and compared with a concrete support, the material is saved.
The construction method for early dismantling the inner support in the subarea of the deep foundation pit is suitable for dismantling the support beam of the inner support span post-cast strip, and can dismantle the inner support in a construction area in advance.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (6)
1. An inner support partition early-dismantling construction method of a deep foundation pit is characterized by comprising the following steps:
a. after an inner support is constructed in a supporting structure of a deep foundation pit, a beam slab structure of a basement is constructed below the inner support, the number of the inner supports is multiple, the multiple inner supports are arranged at intervals along a first horizontal direction, when the beam slab structure is constructed, the beam slab structure is divided into multiple pouring areas along the first horizontal direction, and a post-pouring belt pouring space is formed between every two adjacent pouring areas;
b. sequentially pouring a plurality of pouring areas, wherein after the beam plate structure of the pouring area is poured below a second internal support, after the concrete strength of the beam plate structure below the second internal support reaches the design requirement, a plurality of box-type back-jacking inclined struts are arranged between the second internal support and the beam plate structure below the second internal support, the strength of which reaches the design requirement;
c. after a plurality of box-type back-jacking inclined struts are installed, the first inner support is dismantled;
d. and c, repeating the steps b to c, completing the pouring of the beam slab structures of the rest pouring areas in sequence, and removing the rest inner supports one by one.
2. The construction method for early dismantling the inner support partition of the deep foundation pit as claimed in claim 1, wherein a support column is buried in the deep foundation pit, the support column is supported on the inner support, and the upper end of the box-type back-up diagonal support is connected to the intersection of the support column and the inner support.
3. The method for early dismantling an inner support partition in a deep foundation pit according to claim 2, wherein an upper buried plate is buried in the support column when the support column is poured, a lower buried plate is buried in the upper portion of a beam plate structure below the second inner support when the beam plate structure below the second inner support is poured, and when the box-type back-up diagonal support is installed, the upper end of the box-type back-up diagonal support is installed on the upper buried plate, and the lower end of the box-type back-up diagonal support is installed on the lower buried plate.
4. The method for early dismantling the inner support partition of the deep foundation pit as claimed in claim 1, wherein a plurality of box-type back-up diagonal braces are arranged on one side of the inner support facing the first-course inner support.
5. The construction method for early dismantling the inner support partition of the deep foundation pit according to claim 1, wherein the first inner support is a plate support.
6. The internal support partition early-dismantling construction method of a deep foundation pit according to claim 1, wherein the support structure comprises a plurality of cast-in-situ bored piles arranged in a circumferential direction of the deep foundation pit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210117188.2A CN114411757A (en) | 2022-02-08 | 2022-02-08 | Early-dismantling construction method for inner support partition of deep foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210117188.2A CN114411757A (en) | 2022-02-08 | 2022-02-08 | Early-dismantling construction method for inner support partition of deep foundation pit |
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| CN114411757A true CN114411757A (en) | 2022-04-29 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103711131A (en) * | 2013-12-26 | 2014-04-09 | 中铁十三局集团第六工程有限公司 | Ultra-soft soil large-area deep foundation pit guard post support changing method |
| CN105155549A (en) * | 2015-06-18 | 2015-12-16 | 中建三局第二建设工程有限责任公司 | Partition support system for large-area deep foundation pit under forward and backward working condition, and construction method thereof |
| CN210368980U (en) * | 2019-06-10 | 2020-04-21 | 江苏省岩土工程公司 | Earlier prop formula bracing strut supporting construction system |
| CN111395359A (en) * | 2020-04-27 | 2020-07-10 | 徐州市城市轨道交通有限责任公司 | Construction method for long and narrow type wind pavilion structure foundation pit subsection |
| 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 |
| US20200291597A1 (en) * | 2019-08-08 | 2020-09-17 | Infrastructure Renewal Institute of Southern China | Assembled recyclable rectangular working well with preset detachable door opening and construction method thereof |
| CN112030995A (en) * | 2020-09-04 | 2020-12-04 | 中国建筑一局(集团)有限公司 | Construction method for quickly taking out of ground for supporting and disassembling in advance for main building of super high-rise building |
| CN113006083A (en) * | 2021-03-02 | 2021-06-22 | 中建八局南方建设有限公司 | Support changing construction method for foundation pit inner support |
-
2022
- 2022-02-08 CN CN202210117188.2A patent/CN114411757A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103711131A (en) * | 2013-12-26 | 2014-04-09 | 中铁十三局集团第六工程有限公司 | Ultra-soft soil large-area deep foundation pit guard post support changing method |
| CN105155549A (en) * | 2015-06-18 | 2015-12-16 | 中建三局第二建设工程有限责任公司 | Partition support system for large-area deep foundation pit under forward and backward working condition, and construction method thereof |
| CN210368980U (en) * | 2019-06-10 | 2020-04-21 | 江苏省岩土工程公司 | Earlier prop formula bracing strut supporting construction system |
| US20200291597A1 (en) * | 2019-08-08 | 2020-09-17 | Infrastructure Renewal Institute of Southern China | Assembled recyclable rectangular working well with preset detachable door opening and construction method thereof |
| 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 |
| CN111395359A (en) * | 2020-04-27 | 2020-07-10 | 徐州市城市轨道交通有限责任公司 | Construction method for long and narrow type wind pavilion structure foundation pit subsection |
| CN112030995A (en) * | 2020-09-04 | 2020-12-04 | 中国建筑一局(集团)有限公司 | Construction method for quickly taking out of ground for supporting and disassembling in advance for main building of super high-rise building |
| CN113006083A (en) * | 2021-03-02 | 2021-06-22 | 中建八局南方建设有限公司 | Support changing construction method for foundation pit inner support |
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