CN115387586B - Lifting platform for foundation pit reverse construction and construction method - Google Patents
Lifting platform for foundation pit reverse construction and construction method Download PDFInfo
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- CN115387586B CN115387586B CN202211123269.XA CN202211123269A CN115387586B CN 115387586 B CN115387586 B CN 115387586B CN 202211123269 A CN202211123269 A CN 202211123269A CN 115387586 B CN115387586 B CN 115387586B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/15—Scaffolds primarily resting on the ground essentially comprising special means for supporting or forming platforms; Platforms
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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
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/18—Scaffolds primarily resting on the ground adjustable in height
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/06—Consoles; Brackets
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention relates to a lifting platform for foundation pit reverse construction and a construction method, wherein the lifting platform comprises four reverse steel columns fixed at four corners in a foundation pit, the lifting platform comprises two support platforms for movably supporting the reverse steel columns, a lifting device connected between the two support platforms and an operation platform fixed on the upper support platform, the support platform comprises four support beams, the four support beams are supported between every two adjacent reverse steel columns in a one-to-one correspondence manner, servo systems for adjusting the length and propping the two adjacent reverse steel columns are fixed at two ends of each support beam, and the lifting device is connected between at least one group of corresponding support beams of the two support platforms. The method solves the technical problems of poor quality and high labor cost of the reverse construction node of the reverse construction method of the foundation pit in the prior art. The invention can be lifted in a reverse construction narrow space, reduces the procedures of dismantling, assembling and transferring reverse construction templates and frames, reduces the influence of material transfer on the procedures and improves the construction efficiency of the reverse construction method.
Description
Technical Field
The invention relates to the field of building construction, in particular to a foundation pit reverse construction lifting platform and a construction method.
Background
The reverse construction method is used as the most advanced construction technology at present of high-rise buildings, and under the background of rapid development of the urban process, the reverse construction method has the advantages of simultaneous construction of an overground structure and an underground structure, shortening of construction period, reduction of engineering cost and improvement of engineering economic benefit and social benefit. The reverse construction structure floor slab is used as a foundation pit horizontal support, the support rigidity is high, the deformation of the enclosure structure is small, the influence on the surrounding environment is small, but the soil is dug in the closed space, the structure is constructed, and the risk safety coefficient of deep foundation pit construction is high. For the urban core area, the surrounding environment is complex, the field is narrow, the reverse-acting zero-layer plate structure can be used as a working platform, and the field utilization rate is increased, so that the construction organization is facilitated. When the reverse construction of the engineering is limited by underground space, the reverse construction underground structure mostly adopts a soil moulding bed construction process and an over-digging and supporting short formwork supporting process, the quality deviation of the soil moulding bed construction structure can not meet the requirement of the later decoration construction, and the quality of the underground structure and the reverse construction node is poor; the short formwork support process is carried out by overexcavation, the erection and the disassembly of the frame body formwork are completed in a closed small space, the material dismantling and the transportation are mostly manual operation, the manual consumption is high, and the potential safety hazards of operation in the closed space are high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a lifting platform for reverse construction of a foundation pit and a construction method, and solves the technical problems of poor quality and high labor cost of reverse construction nodes in reverse construction of the foundation pit in the prior art.
The invention discloses a foundation pit reverse construction lifting platform, four reverse steel columns are fixed at four corners in a foundation pit, the foundation pit reverse construction lifting platform comprises two support platforms, a lifting device and an operation platform, the two support platforms are used for movably supporting the two support platforms, the lifting device is connected between the two support platforms, the operation platform is fixed on the support platform above the support platforms, the support platform comprises four support beams, the four support beams are supported between every two adjacent reverse steel columns in a one-to-one correspondence manner, the two ends of each support beam are fixedly provided with servo systems, the servo systems are used for adjusting the length and propping the two adjacent reverse steel columns, and the lifting device is connected between at least one group of the two support platforms, which correspond to the support beams.
The foundation pit reverse construction lifting platform is further improved in that a plurality of brackets for bearing the supporting platform are fixed on each reverse steel column at intervals along the height direction, and the brackets on all the reverse steel columns are arranged in a one-to-one correspondence manner.
The foundation pit reverse construction lifting platform is further improved in that the operation platform comprises an upper net frame, a lower net frame and a support frame, wherein the upper net frame and the lower net frame are arranged in a grid shape, the support frame is connected between the upper net frame and the lower net frame, and the lower net frame is fixed on four support beams of the support platform above.
The foundation pit reverse construction lifting platform is further improved in that the servo system is an axial force servo system.
In a second aspect, the invention also provides a foundation pit reverse construction method, which comprises the following steps: four reverse steel columns are constructed at four corners of the position to be excavated of the foundation pit, and earthwork is excavated in the foundation pit until the foundation pit is under a floor slab of a lower layer; providing two support platforms, wherein each support platform comprises four support beams, and servo systems for adjusting the length are fixed at two ends of each support beam; installing a lower supporting platform between the lower parts of the reverse-acting steel columns of the foundation pit, arranging four supporting beams between every two adjacent reverse-acting steel columns in a one-to-one correspondence manner, and simultaneously extending the servo system to enable the lower supporting platform to be supported between the four reverse-acting steel columns; a lifting device is arranged on a supporting platform at the lower part; installing an upper supporting platform on the lifting device, arranging four supporting beams between every two adjacent reverse-acting steel columns in a one-to-one correspondence manner, and simultaneously extending the servo system to enable the upper supporting platform to be supported between the four reverse-acting steel columns; fixing an operation platform on the upper supporting platform; constructing a structural floor slab on an operation platform, and excavating a foundation pit below the lower supporting platform to a layer height; after the construction of the structural floor and the excavation of the foundation pit are completed, the servo system on the lower supporting platform is adjusted to enable the lower supporting platform to be separated from four reverse-acting steel columns, the lower supporting platform is downwards moved to a lower layer to-be-excavated position through downwards extending of the lifting device, and then the servo system is adjusted to enable the lower supporting platform to be supported among the four reverse-acting steel columns; the servo system on the upper supporting platform is adjusted to separate the upper supporting platform from four reverse steel columns, and the lifting device is shortened to enable the upper supporting platform to move downwards to the position to be constructed of the lower floor.
The foundation pit reverse construction lifting platform is further improved in that a plurality of brackets for supporting the supporting platform are fixed on each reverse steel column at intervals along the height direction, and the brackets on all the reverse steel columns are arranged in a one-to-one correspondence manner; when the lower supporting platform is arranged between the reverse-acting steel columns of the foundation pit, the lower supporting platform is placed on the bracket with the corresponding height; when the upper supporting platform is arranged on the lifting device, the upper supporting platform is placed on the bracket with the corresponding height; when the lower supporting platform and the upper supporting platform are separated from the four reverse steel columns respectively through adjusting the servo system, the supporting platform is prevented from being away from the corresponding bracket.
The invention further improves a foundation pit reverse construction lifting platform, which is characterized in that an operation platform is provided before the operation platform is fixed on a supporting platform, the operation platform comprises an upper net frame and a lower net frame which are arranged in a grid shape, and a supporting frame connected between the upper net frame and the lower net frame, wherein the lower net frame is fixed on the supporting beam of the supporting platform at the upper part.
Compared with the prior art, the invention has positive and obvious effects. Through elevating gear, supporting platform and operation platform's combination make can go on upper and lower structure floor and construction and the excavation of lower part earthwork simultaneously, solved the technical problem that the reverse construction node quality of foundation ditch reverse construction is poor and the cost of labor is high among the prior art. Compared with the traditional reverse construction method, the invention has high construction speed and can realize reverse jump layer excavation; the structure adopts steel structure assembly, so that temporary support can be formed in time after earth excavation, and the foundation pit deformation risk control is facilitated; the technical scheme is that the reverse construction template is lifted in a narrow reverse construction space, the procedures of dismantling, assembling and transferring the frame body are reduced, the influence of material transfer on the procedures is reduced, and the reverse construction efficiency is improved; in addition, a temporary supporting system is formed through the steel supporting roof, so that the intermittent construction period due to structural maintenance is reduced, the continuous construction of reverse soil excavation can be realized, and the construction progress is accelerated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a vertical sectional view of a foundation pit reverse construction lifting platform of the present invention.
Fig. 2 is a top view of the foundation pit reverse construction lifting platform of the present invention.
Fig. 3 is a schematic view of a supporting beam structure of a lifting platform for foundation pit reverse construction.
Fig. 4 is a schematic diagram of an operation platform structure of the foundation pit reverse construction lifting platform.
Fig. 5 is a state diagram of a foundation pit reverse construction method according to the present invention.
Fig. 6 is a second state diagram of the foundation pit reverse construction method of the present invention.
Fig. 7 is a third state diagram of the foundation pit reverse construction method of the present invention.
Fig. 8 is a state diagram of the foundation pit reverse construction method of the present invention.
Fig. 9 is a state diagram five of the foundation pit reverse construction method of the present invention.
Fig. 10 is a state diagram six of the foundation pit reverse construction method of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, 2 and 3, the invention provides a lifting platform for foundation pit reverse construction, four reverse steel columns 11 are fixed at four corners in a foundation pit, the lifting platform comprises two support platforms 1 for movably supporting the reverse steel columns 11, a lifting device 6 connected between the two support platforms 1 and an operating platform 4 fixed on the support platform 1 above, the support platform 1 comprises four support beams 2, the four support beams 2 are supported between every two adjacent reverse steel columns 11 in a one-to-one correspondence manner, two ends of each support beam 2 are fixed with servo systems 3 for adjusting the length and propping against the two adjacent reverse steel columns 11, and the lifting device 6 is connected between at least one group of the two support platforms 1 corresponding to the support beams 2. In the embodiment, the supporting beam is made of a steel structure, the size of the supporting beam can be adjusted according to the width between the reverse-acting steel columns 11 of the foundation pit on site, the supporting beam forms a temporary support after earth excavation by installing the steel structure, and an operation platform 4 is arranged on the supporting beam and is an operation surface of a construction technician; and after the platform is installed, the construction of each layer of structure and the simultaneous construction of the next earth excavation are performed, so that the reverse construction progress is accelerated. After the structure and the lower earthwork excavation are completed, the platform supporting beam is lowered to the excavation surface to form a supporting top, and meanwhile, the lower-layer structure and the next earthwork can be simultaneously carried out, so that the interlayer construction of the structure and the earthwork excavation is realized, and the influence of the reverse construction and the earthwork excavation construction can be avoided. The supporting beam is used for transferring horizontal stress caused by earth excavation, and simultaneously is used as a force transfer system of the operation platform 4 to transfer the force of the operation platform 4 to the reverse-acting steel column 11, and the lifting operation of the lifting system 6 is facilitated by the upper and lower arrangement of the supporting beam. The lifting device is arranged between the upper supporting beam and the lower supporting beam, the distance between the upper supporting beam and the lower supporting beam can be adjusted through extension and contraction of a hydraulic system, and the position of the lifting platform is moved; and also has the functions of bearing and transmitting upper load. The lifting device can adopt lifting rod pieces such as a jack, a hydraulic rod and the like according to the requirements.
Preferably, as shown in fig. 1 and 2, a plurality of brackets 5 for supporting the support platform 1 are fixed on each of the reverse-acting steel columns 11 at intervals along the height direction, and the plurality of brackets 5 on all the reverse-acting steel columns 11 are arranged in a one-to-one correspondence. When the servo system 3 is contracted to the shortest state, the width of the supporting platform is not larger than the distance between the two brackets 5 on the reverse steel columns 11 at the two sides of the foundation pit, and when the servo system 3 is extended to the longest state, the width of the supporting platform is larger than the distance between the reverse steel columns 11 at the two sides of the foundation pit. The bracket 5 is used as a node for fixing the supporting beam, the bracket 5 is manufactured by welding a reverse steel column 11 after earth excavation, in the embodiment, the bracket 5 is manufactured by adopting a steel plate with the width of 200mm, and a rib plate with the width of 10mm is arranged at the lower part of the bracket 5 for reinforcement.
Preferably, as shown in fig. 2 and 4, the operation platform 4 includes an upper net frame 8 and a lower net frame 9 arranged in a grid shape, and a supporting frame 10 connecting between the upper net frame 8 and the lower net frame 9, and the lower net frame 9 is fixed to four supporting beams 2 of the supporting platform 1 above. Further, the widths of the upper net frame 8 and the lower net frame 9 are not larger than the distance between the two brackets 5 on the reverse steel columns 11 at the two sides of the foundation pit. In the implementation, an upper net rack 8 is fixedly manufactured by an upper chord member, a lower net rack 9 is fixedly manufactured by a lower chord member, the upper chord member and the lower chord member are both made of steel, the upper net rack 8 and the lower net rack 9 are assembled together to form a truss, the distance between the trusses in the longitudinal direction and the transverse direction is 1.5m, the height is 500mm, the upper chord and the lower chord of the steel truss are made of two 18b (180 mm in height) channel steel, a support frame 10 is made of 8# channel steel (80 mm in height), and the upper chord and the lower chord are connected with the channel steel by a pin shaft; the upper part of the operation platform 4 is provided with a keel and a template to ensure the construction quality of the reverse construction structure.
Preferably, the servo system 3 is an axial force servo system 3. The axial force servo system 3 can stretch out and draw back the supporting structure column to ensure that the shaped steel beam can effectively generate horizontal axial force, and prevent the horizontal displacement of the enclosure structure and the structure column caused by stress relaxation.
On the other hand, as shown in fig. 5-10, the invention also provides a foundation pit reverse construction method, which comprises the following steps: four reverse steel columns 11 are constructed at four corners of the position to be excavated of the foundation pit, and earth is excavated in the foundation pit until the foundation pit is under the floor slab of the underground layer; providing two support platforms 1, wherein the support platforms 1 comprise four support beams 2, and a servo system 3 for adjusting the length is fixed at two ends of each support beam 2; installing a lower supporting platform 1 between the lower parts of the foundation pit reverse-acting steel columns 11, arranging four supporting beams 2 between every two adjacent reverse-acting steel columns 11 in a one-to-one correspondence manner, and simultaneously extending the servo system 3 to enable the lower supporting platform 1 to be supported between the four reverse-acting steel columns 11; a lifting device 6 is arranged on the lower supporting platform 1; the upper supporting platform 1 is arranged on the lifting device 6, four supporting beams 2 are arranged between every two adjacent reverse-acting steel columns 11 in a one-to-one correspondence manner, and meanwhile, the servo system 3 is extended to enable the upper supporting platform 1 to be supported between the four reverse-acting steel columns 11; an operation platform 4 is fixed on the upper supporting platform 1; constructing a structural floor slab on an operation platform 4, and excavating a foundation pit below the lower supporting platform 1 to a layer height; after the construction of the structural floor and the excavation of the foundation pit are completed, the servo system 3 on the lower supporting platform 1 is adjusted to separate the lower supporting platform 1 from the four reverse-acting steel columns 11, the lower supporting platform 1 is downwards moved to the position to be excavated of the lower layer by downwards extending the lifting device 6, and then the servo system 3 is adjusted to support the lower supporting platform 1 between the four reverse-acting steel columns 11; the servo system 3 on the upper supporting platform 1 is adjusted to separate the upper supporting platform 1 from the four reverse steel columns 11, and the lifting device 6 shortens the upper supporting platform 1 to move downwards to the position to be constructed of the lower floor.
Preferably, a plurality of brackets 5 for supporting the supporting platform 1 are fixed on each reverse-acting steel column 11 at intervals along the height direction, and the brackets 5 on all the reverse-acting steel columns 11 are arranged in a one-to-one correspondence manner; when the lower supporting platform 1 is arranged between the foundation pit reverse-acting steel columns 11, the lower supporting platform 1 is placed on the bracket 5 with the corresponding height; when the upper supporting platform 1 is installed on the lifting device 6, the upper supporting platform 1 is placed on the bracket 5 with the corresponding height; when the lower support platform 1 and the upper support platform 1 are separated from the four reverse steel columns 11 by adjusting the servo system 3, the support platform 1 is prevented from corresponding brackets 5.
Preferably, before the operation platform 4 is fixed on the support platform 1, the operation platform 4 is provided, the operation platform 4 includes an upper net frame 8 and a lower net frame 9 disposed in a grid shape, and a support frame 10 connected between the upper net frame 8 and the lower net frame 9, and the lower net frame 9 is fixed on the support beam 2 of the support platform 1 above.
The following specific steps are explained using B1 laminate (underground one layer laminate), B2 laminate (underground two layer laminate): as shown in fig. 5, first earth 13 is excavated, the earth is excavated to the position 1.5m below the B1 laminate, welding construction is carried out on the bracket 5 for supporting the lower supporting platform 1 as shown in fig. 6, and then the lower supporting platform 1, the lifting device and the upper supporting platform 1 are installed to form a temporary supporting system; an operation platform 4 is arranged at the top of the upper supporting platform 1 to form a whole body so as to form a lifting platform; secondly, carrying out excavation construction of a zero layer plate and a second step of earthwork 14 simultaneously, digging the second step of earthwork 14 to a position 1.5m below a B2 plate, welding brackets 5, and lowering a lower supporting platform 1 to the brackets 5 of the B2 plate through a lifting device to form a supporting roof as shown in FIG. 8; as shown in fig. 9 and 10, then when the structural strength of the zero layer plate meets the requirement, the upper supporting platform 1 and the operating platform 4 are lowered to the position of the bracket 5 of the B1 layer, and the B1 layer plate is constructed; simultaneously carrying out a third step of earthwork excavation; and repeating the above procedures to finish the reverse engineering construction.
As shown in fig. 3, the supporting platform not only supports the upper construction load, but also is connected with the structural columns to form a horizontal supporting system to resist the lateral soil pressure caused by earth excavation; a supporting platform 1 at the lower part is arranged after earth excavation, a servo system 3 is started to prop up a structural column, and a horizontal force transmission system is formed; when the construction of the upper layer structure is completed, the contraction servo system 3 is contracted, the lower supporting platform 1 is separated from the structural column, and the lifting device is started to lower the lower supporting platform 1 to the position of the lower bracket 5 to form a supporting system; and starting the lifting device to descend the upper supporting platform 1 and the operating platform 4 to the position of the lower structure, and constructing the lower structure.
As shown in fig. 4, the operation platform 4 in the lower support platform 1 is a truss steel platform, the upper net rack 8, the lower net rack 9 and the rod pieces of the support frame 10 are connected through pin shafts to form a whole, the longitudinal and transverse truss spacing is 1.5m, and the upper part is directly paved with keels and templates for structural construction.
According to the invention, through the combination of the lifting device, the supporting platform and the operating platform, the upper and lower structural floors, the construction and the excavation of the earthwork at the lower part can be simultaneously carried out, and the technical problems of poor quality and high labor cost of the reverse construction node of the reverse construction method of the foundation pit in the prior art are solved. Compared with the traditional reverse construction method, the invention has high construction speed and can realize reverse jump layer excavation; the structure adopts steel structure assembly, so that temporary support can be formed in time after earth excavation, and the foundation pit deformation risk control is facilitated; the technical scheme is that the reverse construction template is lifted in a narrow reverse construction space, the procedures of dismantling, assembling and transferring the frame body are reduced, the influence of material transfer on the procedures is reduced, and the reverse construction efficiency is improved; in addition, a temporary supporting system is formed through the steel supporting roof, so that the intermittent construction period due to structural maintenance is reduced, the continuous construction of reverse soil excavation can be realized, and the construction progress is accelerated.
None of the inventions are related to the same or are capable of being practiced in the prior art. The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.
Claims (5)
1. The foundation pit reverse construction lifting platform is characterized by comprising two supporting platforms, lifting devices and an operation platform, wherein the two supporting platforms are used for movably supporting the reverse construction steel columns, the lifting devices are connected between the two supporting platforms, the operation platform is fixed on the supporting platforms above the supporting platforms, the supporting platforms comprise four supporting beams, the four supporting beams are supported between every two adjacent reverse construction steel columns in a one-to-one correspondence manner, the two ends of each supporting beam are fixedly provided with servo systems which are used for adjusting the length and propping against the two adjacent reverse construction steel columns, and the lifting devices are connected between at least one group of corresponding supporting beams of the two supporting platforms; and a plurality of brackets used for bearing the supporting platform are fixed on each reverse-acting steel column at intervals along the height direction, and all the brackets on the reverse-acting steel columns are arranged in one-to-one correspondence.
2. The foundation pit reverse construction lifting platform according to claim 1, wherein the operation platform comprises an upper net frame and a lower net frame which are arranged in a grid shape, and a support frame connected between the upper net frame and the lower net frame, and the lower net frame is fixed on four support beams of the support platform above.
3. The foundation pit reverse construction hoist platform of claim 1, wherein the servo system is an axial force servo system.
4. The foundation pit reverse construction method is characterized by comprising the following steps of:
four reverse steel columns are constructed at four corners of the position to be excavated of the foundation pit, and earthwork is excavated in the foundation pit until the foundation pit is under a floor slab of a lower layer;
providing two support platforms, wherein each support platform comprises four support beams, and servo systems for adjusting the length are fixed at two ends of each support beam;
installing a lower supporting platform between the lower parts of the reverse-acting steel columns of the foundation pit, arranging four supporting beams between every two adjacent reverse-acting steel columns in a one-to-one correspondence manner, and simultaneously extending the servo system to enable the lower supporting platform to be supported between the four reverse-acting steel columns;
a lifting device is arranged on a supporting platform at the lower part;
installing an upper supporting platform on the lifting device, arranging four supporting beams between every two adjacent reverse-acting steel columns in a one-to-one correspondence manner, and simultaneously extending the servo system to enable the upper supporting platform to be supported between the four reverse-acting steel columns;
an operation platform is fixed on the upper supporting platform;
constructing a structural floor slab on an operation platform, and excavating a foundation pit below the lower supporting platform to a layer height;
after the construction of the structural floor slab and the excavation of the foundation pit are completed, the servo system on the lower supporting platform is adjusted to enable the lower supporting platform to be separated from four reverse-acting steel columns, the lower supporting platform is downwards moved to a lower layer to-be-excavated position through downwards extending of the lifting device, and then the servo system is adjusted to enable the lower supporting platform to be supported between the four reverse-acting steel columns;
the servo system on the upper supporting platform is adjusted to enable the upper supporting platform to be separated from four reverse-acting steel columns, and the lifting device is used for shortening the upper supporting platform to move downwards to a position to be constructed of a lower floor;
a plurality of brackets for supporting the supporting platform are fixed on each reverse-acting steel column at intervals along the height direction, and the brackets on all the reverse-acting steel columns are arranged in a one-to-one correspondence manner;
when the lower supporting platform is arranged between the foundation pit reverse-acting steel columns, the lower supporting platform is placed on the corbels with corresponding heights;
when the upper supporting platform is arranged on the lifting device, the upper supporting platform is placed on the bracket with the corresponding height;
when the lower supporting platform and the upper supporting platform are separated from the four reverse-acting steel columns respectively through adjusting the servo system, the supporting platforms are enabled to avoid corresponding corbels.
5. The method according to claim 4, wherein the operation platform is provided before the operation platform is fixed on the support platform, the operation platform comprises an upper net frame and a lower net frame which are arranged in a grid shape, and a support frame connecting the upper net frame and the lower net frame, and the lower net frame is fixed on the support beam of the support platform at the upper part.
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| CN202211123269.XA CN115387586B (en) | 2022-09-15 | 2022-09-15 | Lifting platform for foundation pit reverse construction and construction method |
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| CN202211123269.XA CN115387586B (en) | 2022-09-15 | 2022-09-15 | Lifting platform for foundation pit reverse construction and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2741259B2 (en) * | 1989-09-14 | 1998-04-15 | 大成建設株式会社 | Reverse construction method and multifunctional work floor using multifunctional work floor |
| CN102031785A (en) * | 2009-09-24 | 2011-04-27 | 上海市第一建筑有限公司 | Foundation pit supporting technique for replacing temporary enclosing purlin by using plate belt of permanent structure |
| US10138616B2 (en) * | 2016-08-12 | 2018-11-27 | Wuhan Zhihe Geotechnical Engineering Co., Ltd. | Inverse construction method for deep, large and long pit assembling structure of suspension-type envelope enclosure |
| CN106193055B (en) * | 2016-09-09 | 2018-06-22 | 中建三局集团有限公司 | A kind of subway foundation pit liftable support system and its lifting construction method |
| CN109837910B (en) * | 2019-02-19 | 2021-08-13 | 中国建筑第八工程局有限公司 | Foundation pit construction method combining reverse construction method and steel support |
| CN113898007B (en) * | 2021-09-02 | 2022-09-27 | 中建一局集团建设发展有限公司 | Semi-inverse construction method for long-span corridor structure along street |
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