CN117287066A - Integral obstacle clearing construction method for existing two-layer basement - Google Patents
Integral obstacle clearing construction method for existing two-layer basement Download PDFInfo
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- CN117287066A CN117287066A CN202210685879.2A CN202210685879A CN117287066A CN 117287066 A CN117287066 A CN 117287066A CN 202210685879 A CN202210685879 A CN 202210685879A CN 117287066 A CN117287066 A CN 117287066A
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- 238000010276 construction Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 230000006837 decompression Effects 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims 1
- 238000009412 basement excavation Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000001360 synchronised effect Effects 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- E04G23/00—Working measures on existing buildings
- E04G23/08—Wrecking of buildings
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention relates to an integral obstacle-removing construction method for an existing two-layer basement, which is used for obstacle-removing construction of an existing basement structure and an original building envelope, and the construction method fully utilizes the existing basement building envelope while removing obstacles, solves the difficult problem of constructing a pile foundation on a top plate of the existing basement into constructing the pile foundation on a bottom plate, brings convenience for pile foundation construction, increases the safety during pile foundation construction, realizes synchronous implementation of integral obstacle-removing of the two-layer basement and foundation pit excavation of a newly-built underground space, is more beneficial to environmental protection, and saves construction period and construction cost for underground space development of urban updating projects. Compared with the prior art, the invention has the advantages of good construction effect, high efficiency and the like.
Description
Technical Field
The invention relates to the field of basement obstacle clearance, in particular to an integral obstacle clearance construction method for an existing two-layer basement.
Background
With the rapid development of modern cities, the functions of old buildings with long-term construction cannot meet the current use requirements, and cannot meet the current standard requirements of fire protection, energy conservation and the like. Therefore, the renovation and demolition reconstruction projects of old buildings are increasingly increased. But the old building reconstruction and underground space development of the central urban area need to face the difficult problems of underground obstacle removal and surrounding environment protection. The basement, foundation, enclosure and other structures of old and old buildings form barriers for the development of new underground spaces. At present, the obstacle clearing method for shallow-buried foundations and an old basement of the underground layer with complex surrounding environment is to clear the obstacle first, clear the obstacle and backfill the foundation pit enclosure of the new underground space, and finally excavate the foundation pit and return the new underground structure. The demolition reconstruction causes multiple enclosure and multiple excavation to bring superimposed negative effects to the surrounding environment, and simultaneously, the construction cost and the construction period of the engineering construction are increased. The demolition and reconstruction of the two old basements in the underground under the condition of complex surrounding environment are not common, and the traditional method for removing the barrier and then constructing the basement can not meet the requirements of environmental protection, energy conservation, low carbon, construction period and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an existing two-layer basement integral obstacle clearance construction method.
The aim of the invention can be achieved by the following technical scheme:
the integral obstacle clearing construction method of the existing two-layer basement is used for obstacle clearing construction of the existing basement structure and the original building envelope, the existing basement structure is arranged in the original building envelope, the existing basement structure comprises a first layer of underground and a second layer of underground, original engineering piles are arranged at the bottom of the second layer of underground, and the construction method comprises the following steps:
s1: constructing a newly built basement foundation pit support structure outside the original support structure;
s2: removing a wall structure above the top of a layer of floor slab in the underground layer of the existing basement structure, and arranging a supporting structure on an outer wall floor slab of the layer of underground layer;
s3: removing a wall structure above the top of an underground two-layer bottom plate in the existing basement structure, perforating holes on the underground two-layer bottom plate, constructing structural columns, and constructing a first support of a newly built basement support structure based on the structural columns;
s4: removing the outer wall and the original enclosure structure of the existing basement structure above the two layers of bottom plates of the basement, and constructing a second support of the newly-built basement support structure;
s5: and removing the underground two-layer bottom plate, chiseling the original engineering pile and the original enclosure structure from top to bottom to reach a preset height, and constructing a third support at the preset height to finish construction.
Preferably, the supporting structure is a vertical diagonal bracing, the upper end of the vertical diagonal bracing is connected with an outer wall floor slab of the underground first layer, and the lower end of the vertical diagonal bracing is connected with a bottom plate of the underground second layer.
Preferably, the supporting structure further comprises a support changing plate belt, and the support changing plate belt is arranged between the outer wall floor slab of the underground layer and the original enclosure structure.
Preferably, the supporting structure further comprises corbels, and the corbels are arranged at the joint of the vertical diagonal bracing and the underground two-layer bottom plate.
Preferably, the original enclosure structure is a plate-type support structure.
Preferably, the structural column comprises a newly-built engineering pile and an upright pile, wherein the lattice column of the upright pile is lengthened upwards to a preset first supporting elevation, and the first supporting elevation is horizontally arranged at the top of the lattice column of the upright pile.
Preferably, the second support is located at the top of the two floors of the basement.
Preferably, in the construction of the structural column, if the site has pressurized water and the water head is higher than the elevation of the existing bottom plate, the curtain water isolation or decompression precipitation is adopted to perform pile foundation construction of the structural column.
Preferably, the first support, the second support and the third support are reinforced concrete support structures.
Compared with the prior art, the invention has the following advantages:
1. the invention fully utilizes the new and old basement enclosure structures and the basement outer walls, and saves the cost of the two-layer integral barrier-removing foundation pit enclosure.
2. According to the invention, during the obstacle clearance period, the vertical diagonal bracing is arranged, the new basement horizontal support is utilized to reduce the obstacle clearance excavation deformation, and the influence of the old basement obstacle clearance construction on the surrounding environment is effectively controlled;
3. according to the invention, the engineering piles and the upright piles are constructed on the old basement bottom plate, so that the problems of reinforcing the top plate, crossing the basement and the like caused by constructing the pile foundation on the basement top plate are solved, and the safety during the construction of the pile foundation is increased.
4. According to the invention, the construction of the engineering piles and the column piles is carried out on the bottom plate of the old basement, so that the construction of a new basement by secondary excavation of the foundation pit after backfilling of the obstacle clearing foundation pit and pile foundation enclosure construction is avoided, and the construction period and the earthwork cost are saved.
5. The obstacle clearance method can realize the synchronous implementation of the whole obstacle clearance of the two-layer basement and the excavation of the newly built underground space foundation pit, solves the construction difficulty of dismantling and reconstructing the two-layer basement under the complex environment condition, accelerates the urban updating construction period of the underground space of the old building, and is more beneficial to the protection of the surrounding environment.
Drawings
FIG. 1 is a schematic view of a new building envelope constructed outside an old pile according to one embodiment of the present invention.
FIG. 2 is a schematic view of a vertical diagonal brace for use in constructing an interior of an old basement in accordance with an embodiment of the invention.
FIG. 3 is a schematic view of construction of engineered piles and post piles on an old basement floor in accordance with one embodiment of the present invention.
Fig. 4 is a schematic view of a first support of a foundation pit enclosure for a new basement constructed by a rack and bent according to an embodiment of the invention.
FIG. 5 is a schematic illustration of a second support for a new basement foundation pit enclosure constructed on an old basement floor in accordance with one embodiment of the present invention.
FIG. 6 is a schematic illustration of a third support for constructing a new basement foundation pit enclosure in accordance with an embodiment of the present invention.
Wherein, 1, the existing basement structure, 2, the original building envelope, 3, the newly built basement foundation pit building envelope, 4, the embedded part, 5, the bracket, 6, the vertical diagonal bracing, and 7, a support plate and strip replacement, 8, a newly-built engineering pile, 9, a column pile, 10, a first support, 11, a second support, 12, an original engineering pile, 13 and a third support.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. Note that the following description of the embodiments is merely an example, and the present invention is not intended to be limited to the applications and uses thereof, and is not intended to be limited to the following embodiments.
Examples
The integral obstacle clearing construction method for the existing two-layer basement is used for clearing the existing basement structure 1 and the original building enclosure 2, wherein the existing basement structure 1 is arranged in the original building enclosure 2, the existing basement structure 1 comprises a first underground layer and a second underground layer, and the bottom of the second underground layer is provided with an original engineering pile 12. The original enclosure structure 2 is a plate-type supporting structure.
In the embodiment, a building with two layers underground is taken as an example, the existing building adopts raft pile foundation, the thickness of the raft is 1400-1800 mm, the engineering pile is a drilling filling pile with phi 600mm, and the pile length is 36m. The existing building basement foundation pit guard pile adopts a raft plate phi 850@950 bored pile, the pile length is 18.2m, the outer side of the guard pile adopts two rows of double-shaft cement-soil mixing piles for lap joint water stop, and the pile length is 17m. The existing building is dismantled and rebuilt, and the underground space of the newly built building is an underground three-layer garage. After the ground structure of the existing building is removed, the method is adopted to remove the obstacle and construct simultaneously. The construction method comprises the following steps:
s1: as shown in fig. 1, constructing a newly built basement foundation pit support structure 3 outside an original support structure 2, and sequentially constructing a waterproof curtain stirring pile, a diaphragm wall and a crown beam;
s2: as shown in fig. 2, after the newly-built basement foundation pit enclosure structure 3 reaches the design strength, the top plate, the inner wall, the outer wall and the like of the existing basement structure 1 are gradually chiseled off to the top of the one-layer floor slab, 500mm is reserved above the floor slab, the embedded part 4 is constructed by drilling the elevation of the one-layer floor slab outside the underground, the concrete bracket 5 is constructed by planting the reinforcement on the two-layer floor slab, the vertical diagonal bracing 6 is erected and supported on the existing basement floor slab, the vertical diagonal bracing 6 adopts a steel pipe structure, and the plane spacing of the vertical diagonal bracing 6 is 7-8 meters. And the outer side of the outer wall of the existing basement corresponds to the elevation of a layer of building plate in the underground, and the existing support-changing plate belt 7 is used for changing supports to transfer force to the existing basement enclosure structure.
S3: as shown in fig. 3, after the vertical diagonal bracing 6 is integrally formed, gradually chiseling the structural floor slab and the inner wall above the top of the existing underground two-layer bottom plate; and (3) drilling accurate holes on the existing underground two-layer bottom plate by a machine, and constructing a newly-built engineering pile 8 and a stand column pile 9. If the site has pressure-bearing water and the water head is higher than the elevation of the existing bottom plate, pressure-bearing water control measures such as curtain water isolation, decompression and precipitation are adopted to ensure the safety of pile foundation construction and surrounding environment.
As shown in fig. 4, after the construction of the engineering pile and the column pile 9 is completed, the lattice column of the column pile 9 is lengthened to the designed elevation, and the first support 10 of the newly-built basement support structure is constructed by the framework construction, wherein the first support 10 is in a reinforced concrete structure, and the first support 10 is horizontally arranged at the top of the lattice column of the column pile 9.
S4: as shown in fig. 5, after the first support 10 reaches the design strength, the outer wall of the existing basement structure 1 and the original enclosure structure 2 above the vertical diagonal braces 6 and the basement two-layer bottom plate are removed; and constructing a second support 11 of the newly-built basement support structure on the top of the existing basement bottom plate, wherein the second support 11 is positioned at the top of the basement two-layer bottom plate, and the second support 11 is of a reinforced concrete structure.
S5: as shown in fig. 6, after the second support 11 reaches the design strength, the existing basement bottom plate, the old engineering piles and the old building envelope are chiseled to the third support elevation, and the third support 13 is constructed, wherein the third support 13 is a reinforced concrete structure.
S6: step seven: and finally, transferring to the subsequent conventional foundation pit construction.
The above embodiments are merely examples, and do not limit the scope of the present invention. These embodiments may be implemented in various other ways, and various omissions, substitutions, and changes may be made without departing from the scope of the technical idea of the present invention.
Claims (10)
1. The integral obstacle clearing construction method for the existing two-layer basement is characterized by being used for obstacle clearing construction of an existing basement structure (1) and an original building envelope (2), wherein the existing basement structure (1) is arranged in the original building envelope (2), the existing basement structure (1) comprises a first layer and a second layer, original engineering piles (12) are arranged at the bottom of the second layer, and the construction method comprises the following steps:
s1: constructing a newly built basement foundation pit support structure (3) outside the original support structure (2);
s2: removing a wall structure above the top of a layer of underground floor slab in the existing basement structure (1), and arranging a supporting structure on an outer wall floor slab of the layer of underground floor slab;
s3: removing a wall structure above the top of an underground two-layer bottom plate in the existing basement structure (1), perforating holes on the underground two-layer bottom plate, constructing structural columns, and constructing a first support (10) of a newly built basement support structure based on the structural columns;
s4: removing the outer wall of the existing basement structure (1) and the original enclosure structure (2) above the two layers of bottom plates of the basement, and constructing a second support (11) of the newly-built basement support structure;
s5: and removing the underground two-layer bottom plate, chiseling the original engineering pile (12) and the original enclosure structure (2) from top to bottom to reach a preset height, and constructing a third support (13) at the preset height to finish construction.
2. The method for constructing the integral obstacle clearance of the two-layer basement according to claim 1, wherein the supporting structure is a vertical diagonal brace (6), the upper end of the vertical diagonal brace (6) is connected with an outer wall floor slab of the first layer underground, and the lower end of the vertical diagonal brace is connected with a bottom plate of the second layer underground.
3. The method for constructing the integral obstacle clearance of the two-layer basement according to claim 2, wherein the supporting structure further comprises a support exchanging plate belt (7), and the support exchanging plate belt (7) is arranged between an outer wall floor slab of the underground one layer and the original enclosure structure (2).
4. The method for constructing the integral obstacle clearance of the two-layer basement according to claim 2, wherein the supporting structure further comprises bracket (5), and the bracket (5) is arranged at the joint of the vertical diagonal brace (6) and the two-layer basement bottom plate.
5. The method for constructing the integral obstacle clearance of the two-layer basement according to claim 1, wherein the original enclosure structure (2) is a plate-type supporting structure.
6. The method for constructing the integral obstacle clearance of the two-layer basement according to claim 1, wherein the structural column comprises a newly-built engineering pile (8) and a column pile (9), the lattice column of the column pile (9) is lengthened upwards to the elevation of a preset first-pass support (10), and the first-pass support (10) is horizontally arranged at the top of the lattice column of the column pile (9).
7. The method for constructing the integral obstacle clearing of the two-storey basement according to claim 1, wherein the second support (11) is positioned at the top of the two-storey basement.
8. The method for constructing the integral obstacle clearing of the two-layer basement according to claim 1, wherein in the construction of the structural column, if the site has pressurized water and the water head is higher than the elevation of the existing bottom plate, the curtain water insulation or decompression precipitation is adopted for the pile foundation construction of the structural column.
9. The method for constructing the integral obstacle clearing of the existing two-layer basement according to claim 1, wherein the newly built basement foundation pit enclosure structure (3) comprises waterproof curtain stirring piles, underground continuous walls and crown beams.
10. The method for constructing the integral obstacle clearance for the two-layer basement according to claim 1, wherein the first support (10), the second support (11) and the third support (13) are all reinforced concrete support structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210685879.2A CN117287066A (en) | 2022-06-16 | 2022-06-16 | Integral obstacle clearing construction method for existing two-layer basement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210685879.2A CN117287066A (en) | 2022-06-16 | 2022-06-16 | Integral obstacle clearing construction method for existing two-layer basement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117287066A true CN117287066A (en) | 2023-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210685879.2A Pending CN117287066A (en) | 2022-06-16 | 2022-06-16 | Integral obstacle clearing construction method for existing two-layer basement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117287066A (en) |
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2022
- 2022-06-16 CN CN202210685879.2A patent/CN117287066A/en active Pending
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