CN114134931A - Reverse construction method for existing building development basement structure - Google Patents
Reverse construction method for existing building development basement structure Download PDFInfo
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- CN114134931A CN114134931A CN202111382385.9A CN202111382385A CN114134931A CN 114134931 A CN114134931 A CN 114134931A CN 202111382385 A CN202111382385 A CN 202111382385A CN 114134931 A CN114134931 A CN 114134931A
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- 238000010276 construction Methods 0.000 title claims abstract description 73
- 238000009424 underpinning Methods 0.000 claims abstract description 113
- 239000002689 soil Substances 0.000 claims abstract description 17
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 12
- 239000004567 concrete Substances 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 description 4
- 238000009415 formwork Methods 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 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
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a reverse construction method of an existing building development basement structure, which comprises the following steps: drilling holes on the periphery of the existing structural column to construct a vertical column pile; constructing a underpinning column on the upright column pile; constructing an underpinning bearing platform above the existing foundation, connecting an underpinning column with the underpinning bearing platform, and connecting the underpinning bearing platform with the existing structural column to form an underpinning structure; dismantling the existing foundation; excavating a soil body until the elevation of an underground structure layer is lower than the elevation of the underground structure layer, and erecting a template support; constructing a beam on the template support, reserving a dowel bar below the beam, constructing a structural floor slab on the beam and reserving a soil outlet until the construction of the bottom structural floor slab is finished; constructing underground structural columns among the underground structural layers by a sequential construction method; removing the underpinning bearing platform and the underpinning column between the underpinning bearing platform and the bottom structure floor slab; and performing gap filling construction on the soil outlet. The invention can improve the bearing capacity of the existing building, improve the construction safety, ensure the verticality of the underground structural column, prevent the underground structural column from deviating and improve the construction quality.
Description
Technical Field
The invention relates to the technical field of building engineering, in particular to a reverse construction method for an existing building development basement structure.
Background
With the continuous advance of urbanization, old buildings are frequently transformed in cities in recent years, and underground spaces of the old buildings are more and more widely developed and utilized. The existing old buildings are mostly located in the urban core area, the construction site is narrow and small, the site traffic organization is difficult, the civilized construction requirement is high, and great challenges are brought to the reconstruction and construction of the underground space of the building. The foundation pit and basement structure construction by the conventional sequential method is difficult to adapt to the requirement of storey-adding construction of the basement of the existing building. The foundation pit reverse construction method can effectively control the deformation of the foundation pit under the complex environmental condition, saves the construction period and resources, adopts a one-column-one-pile form, but can hardly meet the actual construction requirements under the condition of large load of an upper structure. In addition, the requirement on the perpendicularity of the formed pile and the like is high in one-column one-pile reverse construction method, increased structural column deviation is often caused in the construction, and the structural construction precision and the later-stage function use of the building are affected. Therefore, how to update and reconstruct the basement structure without deviation of the underground structure column under the existing building only with the upper building structure on the premise of meeting the bearing capacity of the upper building structure becomes a technical problem which needs to be solved in the field.
Disclosure of Invention
The invention aims to solve the technical problem that the existing reverse construction method for building development basement structure is provided, so as to solve the problems that the bearing capacity of a single pile constructed by a one-pile reverse construction method is small and cannot meet the condition that the load of the upper structure of the existing building is large, and the verticality deviation of a newly added structure is caused by the verticality deviation of a one-pile reverse construction method construction pile, so that the structure safety is influenced.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a reverse construction method for an existing building development basement structure comprises the following steps:
step S1, drilling holes on the periphery of an existing structural column in an existing building room to construct upright column piles;
step S2, constructing a underpinning column on the upright column pile;
step S3, constructing a underpinning bearing platform above the existing foundation, connecting the underpinning column with the underpinning bearing platform, and connecting the underpinning bearing platform with the existing structural column, so that the underpinning bearing platform, the underpinning column, the upright column pile and the existing structural column form an underpinning structure for providing bearing capacity for the existing building;
step S4, removing the existing foundation;
step S5, soil body of the existing building development basement structure is excavated downwards until the elevation of the current underground structure layer is lower than that of the current underground structure layer, and a template support is erected;
step S6, constructing a beam of the current underground structure layer on a template support, reserving dowels at the position below the beam corresponding to the existing structural columns, constructing a structural floor slab of the current underground structure layer on the beam after the strength of the beam reaches a standard, and reserving a soil outlet on the structural floor slab;
step S7, repeating the steps S5 to S6 until the construction of the bottom layer structure floor slab of the basement structure is finished, and reserving the dowel bars upwards at the corresponding positions of the bottom layer structure floor slab;
step S8, constructing underground structural columns between the reserved joint bars of each underground structural layer of the basement structure from bottom to top in a sequential manner;
step S9, after the strength of the underground structural column reaches the standard, gradually removing the underpinning bearing platform and the underpinning column between the underpinning bearing platform and the bottom structural floor from top to bottom;
and step S10, performing gap filling construction on the unearthed hole.
Further, according to the reverse construction method of the existing building development basement structure provided by the invention, in step S6, when the position of the soil outlet reserved on the structural floor slab intersects with the beam, the soil outlet simultaneously penetrates through the structural floor slab and the beam.
Further, in the reverse construction method of the basement structure for the existing building development provided by the invention, in the steps S1 to S2, when the existing foundation is the existing raft foundation, the existing raft foundation is drilled with the vertical column piles and the underpinning columns.
Further, the reverse construction method of the existing building development basement structure provided by the present invention, in the steps S1 to S2, when the existing foundation is the existing bar foundation or the existing independent foundation, the stud pile and the underpinning column are drilled out of the existing bar foundation or the existing independent foundation.
Further, the reverse construction method of the existing building development basement structure provided by the invention is that in step S1, the upright post pile is constructed by static pressure method or hammering method.
Further, in step S8, the method for constructing the underground structural column by using the sequential method includes: and binding a reinforcement cage between the reserved joint bars of each underground structure layer of the basement structure from bottom to top and pouring concrete to form the underground structure column of the reinforced concrete structure.
Further, in the reverse construction method of the basement structure for existing building development provided by the invention, in step S3, the underpinning platform is in a rectangular plate-shaped structure.
Further, in the reverse construction method of the existing building development basement structure provided by the invention, in step S8, the underpinning structure comprises an underpinning bearing platform, four underpinning columns, four upright column piles and an existing structure column.
Further, the reverse construction method of the existing building development basement structure provided by the invention further comprises the step of removing the existing structural columns below the underpinning bearing platform in the step S4.
Further, in the reverse construction method of the basement structure for existing building development provided by the invention, in step S2, the underpinning column is a lattice column.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a reverse construction method for developing a basement structure of an existing building, which integrally underpins an existing foundation of the existing building through an underpinning structure, so that the existing building is supported through the underpinning structure, and safe construction is guaranteed on the premise of not influencing the existing building when the basement structure is developed under the existing building. The underpinning structure is composed of an underpinning bearing platform, underpinning columns, upright column piles and existing structural columns, namely, the existing structural columns of the existing building are connected with newly-added underpinning columns and upright column piles through the underpinning bearing platform, so that a plurality of columns are associated one by one through the underpinning bearing platform, the bearing capacity of the existing building is improved, the construction safety of developing basement structures on the existing building is improved, the influence on the existing building and the surrounding environment is reduced, and the problem of insufficient bearing capacity of the columns is solved.
According to the reverse construction method for the existing building development basement structure, the underground structure columns are constructed among the underground structure layers through the sequential construction method, the verticality of the underground structure columns can be guaranteed, the underground structure columns are prevented from deviating, the construction quality of the basement structure is improved, and the safe use of the basement structure is guaranteed.
Drawings
FIG. 1 is a schematic view of the construction of a post pile and underpinning post of an underpinning structure on an existing building;
FIG. 2 is a schematic view of a column pile and a node structure of an underpinning column for constructing an underpinning structure on an existing building;
FIG. 3 is a schematic view of a nodal structure of an underpinning platform for constructing an underpinning structure on an existing building to form an underpinning structure;
FIG. 4 is a schematic elevation view of formwork support, beams, structural floor slabs and reinforcing bars in an existing building construction underpinning structure;
FIG. 5 is a schematic plan view of the structure of basement structure with export soil reserved on the structural floor;
FIG. 6 is a schematic plan view of a construction underpinning structure on an existing building;
FIG. 7 is a schematic view of a node structure for constructing an underpinning structure on an existing building and B0 floors, beams and reinforcing steel bars below the underpinning structure;
fig. 8 is a schematic view of an elevation structure for developing a three-story basement structure on an existing building;
fig. 9 is a schematic view of a column structure for constructing underground structural columns between underground structural layers of a developed basement structure;
FIG. 10 is a schematic elevational view of the underpinning platform removed and its underpinning columns disposed between the underpinning platform and the underlying structural floor slab;
FIG. 11 is a schematic plan view of the construction of an underpinning structure on an existing strip foundation;
FIG. 12 is a schematic plan view of the construction of an underpinning structure on an existing stand-alone foundation;
shown in the figure:
1. existing structural columns;
2. existing foundations are available;
3. a vertical column pile;
4. underpinning the column;
5. underpinning the bearing platform;
6. a beam;
7. reinforcing steel bars;
8. a structural floor slab;
9. a template holder;
10. existing buildings;
11. an underground structural column;
12. a soil taking port;
201. existing strip foundations are available;
202. there is an independent foundation.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures: the advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Referring to fig. 1 to 12, an embodiment of the present invention provides a reverse construction method for an existing building to develop a basement structure, which may include:
in step S1, please refer to fig. 1 to 2, a hole is drilled around the existing structural column 1 in the existing building 10 to construct the stud pile 3. And when the existing foundation 2 is the existing raft foundation, drilling the existing raft foundation to construct the upright posts 3 and the underpinning posts 4. Referring to fig. 11 to 12, when the existing foundation 2 is the existing strip foundation 201 or the existing independent foundation 202, stud piles and underpinning columns are drilled out of the existing strip foundation 201 or the existing independent foundation 202. The existing strip foundation 201 or the existing independent foundation 202 does not need to be drilled, and construction difficulty is reduced. That is, the embodiment of the present invention is applicable to various existing foundation 2 forms, such as an existing raft foundation, an existing strip foundation 201, and an existing independent foundation 202. In which the stud pile 3 may be constructed by static pressure method or hammering method.
In step S2, please refer to fig. 1 to 2, the underpinning column 4 is constructed on the upright post 3. In which the underpinning post 4 is inserted inside the stud 3. Wherein the underpinning column 4 can be a lattice column. The latticed column plays a role of temporary support and is subsequently dismantled.
Step S3, referring to fig. 3, 4 and 6, constructing a underpinning platform 5 above the existing foundation 2, connecting the underpinning column 4 with the underpinning platform 5, and connecting the underpinning platform 5 with the existing structural column 1, so that the underpinning platform 5, the underpinning column 4, the upright column 3 and the existing structural column 1 form an underpinning structure providing bearing capacity to the existing building 10. Wherein the underpinning structures are a plurality of. Compared with a column-pile foundation, the underpinning structure improves the structural bearing capacity and can realize the supporting strength of the existing building 10 with only the upper structure when a basement structure is developed. Wherein the underpinning platform 5 is generally rectangular plate-like in shape, although other shapes are possible. Each underpinning structure comprises an underpinning bearing platform 5, at least four underpinning columns, corresponding upright piles 3 and an existing structural column 1. The underpinning columns 4 and the upright piles 3 are associated through the underpinning bearing platforms 5, so that the overall strength of the underpinning structure is improved, the existing structural columns 1 are associated through the underpinning bearing platforms 5, the overall support on the existing building 10 is realized, and the structural safety is guaranteed. The underpinning columns 4 and the corresponding upright piles 3 are not limited to four, and can be more than four, and the more the number is, the higher the strength is.
In step S4, please refer to fig. 4, the existing foundation 2 is removed. The existing foundation 2 can be dismantled through the underpinning structure, so that the existing support system of the existing building 10 is underpinned integrally, the underpinning structure is used as the support system for developing the basement structure, and the construction safety for developing the basement structure is guaranteed. In step S4, it may also include removing the existing structural columns 1 located under the underpinning platform 5.
Step S5, please refer to fig. 4, proceed the soil excavation of the existing building 10 to develop the basement structure to below the current underground structure level, and set up the formwork support 9.
Step S6, please refer to fig. 4, 5 and 7, constructing a beam 6 of the current underground structure layer on the formwork support 9, reserving a dowel 7 downwards at a position below the beam 6 corresponding to the existing structural column 1, constructing a structural floor 8 of the current underground structure layer on the beam 6 after the strength of the beam 6 reaches a standard, reserving a soil outlet 12 on the structural floor 8, and taking soil for soil excavation. When the position of the prepared soil-discharging opening 12 on the structural floor 8 intersects the beam 6, the soil-discharging opening 12 penetrates both the structural floor 8 and the beam 6. When the position of the reserved soil-discharging opening 12 does not intersect with the beam 6, the soil-discharging opening 12 is reserved only on the structural floor slab 8. Wherein the soil outlet 12 may be rectangular or other shape that facilitates soil removal. In step S4, the existing structural columns 1 under the underpinning bearing platform 5 are removed, so that the construction of the beams 6 and the structural floor slabs 8 is facilitated, the interference is avoided, and the construction difficulty is reduced.
Step S7, please refer to fig. 8, repeat steps S5 to S6 until the bottom floor structure 8 of the basement structure is completely constructed, and reserve the dowel 7 upwards at the corresponding position of the bottom floor structure 8. Three underground structural layers are shown in fig. 8, but the number of the underground structural layers is not limited to three, and the underground structural layers may be less than three, or more than three.
Step S8, please refer to fig. 9, the underground structure column 11 is constructed between the reserved dowels 7 of each underground structure layer of the basement structure from bottom to top. The underground structure column 11 is constructed by the sequential construction method, the deviation of the verticality of the underground structure column 11 can be avoided, and compared with the technical means that the upright column 3 constructed by the reverse construction method is used as the underground structure column 11 of the developed basement structure, the construction difficulty is reduced, the verticality is improved, and the structure safety is guaranteed. The method for constructing the underground structural column 11 by adopting the sequential method comprises the following steps: and binding a reinforcement cage between the reserved joint bars 7 of each underground structure layer of the basement structure from bottom to top, and pouring concrete to form the underground structure column 11 of the reinforced concrete structure.
Step S9, please refer to fig. 10, after the strength of the underground structural columns 11 reaches the standard, the underpinning platform 5 and the underpinning columns 4 between the underpinning platform and the bottom structural floor slab 8 are removed gradually from top to bottom. The underpinning columns 4 and their connected stud piles 3 remain below the floor 8 of the underlying structure. The underpinning columns and the upright column piles 3 which are positioned below the floor slab 8 of the bottom structure are used as a supporting system of an existing building 10 for developing a basement structure, so that the structural safety is guaranteed.
In step S10, the unearthed portion 12 is repaired. The function of the filling-up construction is to ensure the integrity of the structural floor slab 8 and the beam 6.
The reverse construction method for developing the basement structure of the existing building, provided by the embodiment of the invention, integrally underpins the existing foundation 2 of the existing building 10 through the underpinning structure, so that the underpinning structure is used as a support system to support the existing building 10, and the safe construction is ensured on the premise of not influencing the existing building 10 when the basement structure is developed under the existing building 10. The underpinning structure is composed of an underpinning bearing platform 5, an underpinning column 4, a vertical column pile 3 and an existing structural column 1, namely the existing structural column 1 is connected with the newly-added underpinning column 4 and the vertical column pile 3 through the underpinning bearing platform 5, so that a plurality of columns and piles are associated through the underpinning bearing platform 5, the bearing capacity of the existing building 10 is improved, the construction safety of the basement structure on the existing building 10 is improved, the influence on the existing building and the surrounding environment is reduced, and the problem of insufficient bearing capacity of the columns and the piles is solved.
According to the reverse construction method for the existing building development basement structure, the underground structure columns 11 are constructed among the underground structure layers through the forward construction method, the verticality of the underground structure columns 11 can be guaranteed, the underground structure columns 11 are prevented from deviating, the construction quality of the basement structure is improved, and the safe use of the basement structure is guaranteed.
The present invention is not limited to the above-described specific embodiments, and it is apparent that the above-described embodiments are some, not all, of the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention. Other levels of modification and variation of the present invention may be made by those skilled in the art. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims.
Claims (10)
1. A reverse construction method for an existing building development basement structure is characterized by comprising the following steps:
step S1, drilling holes on the periphery of an existing structural column in an existing building room to construct upright column piles;
step S2, constructing a underpinning column on the upright column pile;
step S3, constructing a underpinning bearing platform above the existing foundation, connecting the underpinning column with the underpinning bearing platform, and connecting the underpinning bearing platform with the existing structural column, so that the underpinning bearing platform, the underpinning column, the upright column pile and the existing structural column form an underpinning structure for providing bearing capacity for the existing building;
step S4, removing the existing foundation;
step S5, soil body of the existing building development basement structure is excavated downwards until the elevation of the current underground structure layer is lower than that of the current underground structure layer, and a template support is erected;
step S6, constructing a beam of the current underground structure layer on a template support, reserving dowels at the position below the beam corresponding to the existing structural columns, constructing a structural floor slab of the current underground structure layer on the beam after the strength of the beam reaches a standard, and reserving a soil outlet on the structural floor slab;
step S7, repeating the steps S5 to S6 until the construction of the bottom layer structure floor slab of the basement structure is finished, and reserving the dowel bars upwards at the corresponding positions of the bottom layer structure floor slab;
step S8, constructing underground structural columns between the reserved joint bars of each underground structural layer of the basement structure from bottom to top in a sequential manner;
step S9, after the strength of the underground structural column reaches the standard, gradually removing the underpinning bearing platform and the underpinning column between the underpinning bearing platform and the bottom structural floor from top to bottom;
and step S10, performing gap filling construction on the unearthed hole.
2. The reverse construction method of the existing building development basement structure according to claim 1, wherein the unearthed hole penetrates through the structural floor slab and the beam at the same time when the position of the unearthed hole reserved on the structural floor slab intersects the beam at step S6.
3. The reverse construction method of the existing building development basement structure according to claim 1, wherein, in steps S1 to S2, when the existing foundation is an existing raft foundation, the existing raft foundation is drilled with vertical column piles and underpinning columns.
4. The reverse construction method of the existing building development basement structure according to claim 1, wherein the stud piles and the underpinning columns are bored out of the existing bar-shaped foundations or the existing independent foundations when the existing foundations are the existing bar-shaped foundations or the existing independent foundations in steps S1 to S2.
5. The reverse construction method of the existing building development basement structure according to claim 1, wherein the stud piles are constructed by a static pressure method or a hammering method in step S1.
6. The reverse construction method of the existing building development basement structure according to claim 1, wherein in the step S8, the method of constructing the underground structure column using the forward construction method comprises: and binding a reinforcement cage between the reserved joint bars of each underground structure layer of the basement structure from bottom to top and pouring concrete to form the underground structure column of the reinforced concrete structure.
7. The reverse construction method of the existing building development basement structure according to claim 1, wherein in step S3, the underpinning platform is a rectangular plate-shaped structure.
8. The reverse construction method of the existing building development basement structure according to claim 1, wherein the underpinning structure comprises one underpinning platform, four underpinning columns and four upright piles and one existing structural column at step S8.
9. The reverse construction method of the existing building development basement structure according to claim 1, further comprising removing existing structural columns located under the underpinning platform in step S4.
10. The reverse construction method of the existing building development basement structure according to claim 1, wherein in step S2, the underpinning columns are lattice columns.
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| CN202111382385.9A CN114134931B (en) | 2021-11-22 | 2021-11-22 | Reverse construction method for developing basement structure of existing building |
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| CN202111382385.9A CN114134931B (en) | 2021-11-22 | 2021-11-22 | Reverse construction method for developing basement structure of existing building |
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| CN113982035A (en) * | 2021-10-25 | 2022-01-28 | 中国建筑一局(集团)有限公司 | Beam-column conversion structure in top-down construction and construction method thereof |
| CN114635580A (en) * | 2022-03-09 | 2022-06-17 | 上海勘察设计研究院(集团)有限公司 | Underground storey-adding underpinning structure utilizing existing building foundation structure and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113982035A (en) * | 2021-10-25 | 2022-01-28 | 中国建筑一局(集团)有限公司 | Beam-column conversion structure in top-down construction and construction method thereof |
| CN114635580A (en) * | 2022-03-09 | 2022-06-17 | 上海勘察设计研究院(集团)有限公司 | Underground storey-adding underpinning structure utilizing existing building foundation structure and construction method thereof |
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| CN114134931B (en) | 2023-11-28 |
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