CN113373998A - Structure reconstruction and reinforcement method for constructing diaphragm wall in existing underground building - Google Patents
Structure reconstruction and reinforcement method for constructing diaphragm wall in existing underground building Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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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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- E—FIXED CONSTRUCTIONS
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- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
A method for reconstructing and reinforcing a structure of a diaphragm wall of a foundation pit in an existing building, in an overlapping area of a deep foundation pit and a peripheral building, reconstructing the existing structure by newly constructing a partition wall in the building, simultaneously using the partition wall as a diaphragm wall guide wall and constructing a rib wall close to the back of the partition wall; grouting reinforcement is carried out on the diaphragm wall within a certain grooving depth range from a building bottom plate, full red scaffold reinforcement is carried out on each floor slab in the building, temporary steel supports are newly arranged in partition walls on two sides for supporting, and the existing structure is reinforced; cutting the floor slab of the structure in the grooving range of the diaphragm wall layer by layer and backfilling the space between the two newly-made partition walls to create conditions for the framing construction of the diaphragm wall; the deformation and settlement of the existing building are controlled by monitoring the deformation of the existing building. The invention has mature process and simple and convenient operation, and has very important reference value and practical significance for the construction of the existing underground buildings on the same type of deep foundation pit underground diaphragm wall crossing periphery.
Description
Technical Field
The invention relates to the technical field of construction and construction, in particular to a structural transformation and reinforcement method for constructing a diaphragm wall in an existing underground building.
Background
With the development of underground space engineering, the situation of overlapping and conflict with the existing underground structure can be avoided, for example, when a subway station is newly built, the station position is limited by the influence of circuits, functions, peripheral control pipelines and building structures, so that the adjustment of the planned station position can not be carried out, and the planned station position is overlapped with the position of the existing building at the periphery. Therefore, the development of underground space in the overlapped region of underground space, especially in the busy region of city, is undoubtedly a great technical problem to be solved urgently. At present, an existing underground space structure overlapped with the existing underground space structure is reformed, then building enclosing structures and deep foundation pit construction are carried out in the underground space range, and finally a co-construction space is formed, and currently, related experience of such construction can not be used for reference at home.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a structural modification and reinforcement method for constructing an underground diaphragm wall in an existing underground building, wherein a partition wall is newly constructed in the building and is also used as an underground diaphragm wall guide wall, a rib wall is constructed by being attached to the back of the partition wall, grouting reinforcement is carried out on the underground diaphragm wall within a certain grooving depth range from a building bottom plate, full red scaffold reinforcement is carried out on each floor slab in the building, section steel supports are newly constructed in the partition walls on two sides for supporting, the floor slab in the grooving range of the underground diaphragm wall is cut layer by layer, and the space between the two newly constructed partition walls is backfilled, so that conditions are created for the framing construction of the underground diaphragm wall; deformation settlement influence which may be generated by the existing building is controlled by monitoring deformation of the existing building.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for reconstructing and reinforcing a structure of a ground connection wall constructed in an existing underground building comprises a first floor (7-1) with a negative existing structure, a first floor (7-2) with a negative existing structure, a second floor (8-1) with a negative existing structure, a second floor (8-2) with a negative existing structure, a third floor (9-1) with a negative existing structure, a third floor (9-2) with a negative existing structure, a top plate (10) with an existing structure, a floor (11) with a negative existing structure, a second floor (12) with a negative existing structure and a bottom plate (13) with an existing structure, and is characterized in that the first floor (7-1) with a negative existing structure, the second floor (8-2) with a negative existing structure, the third floor (9-1) with a negative existing structure, the first floor (7-2) with a negative existing structure, the second floor (8-1) with a negative existing structure and the third floor (9-2) with a negative structure penetrate through the interior of the building, two reinforced concrete partition walls (2) are arranged along the underground diaphragm wall (1) from the existing structure bottom plate (13) to the existing structure top plate (10); i-shaped rib walls (3) are arranged in spaces of a structural negative layer (7-1), an existing structural negative layer (7-2), an existing structural negative second layer (8-1) and an existing structural negative second layer (8-2) at the outer sides of the two reinforced concrete partition walls (2), and II-shaped rib walls (4) are arranged in spaces of an existing structural negative third layer (9-1) and an existing structural negative third layer (9-2); the two reinforced concrete partition walls (2) are horizontally and transversely supported and reinforced through section steel supports (5); the stratum under the existing structural bottom plate (13) and the underground diaphragm wall (1) is reinforced (6) by grouting.
The section steel supports (5) are horizontally and transversely supported and reinforced by the section steel supports (5) through reserving door openings from the underground diaphragm wall (1) to the two reinforced concrete partition walls (2), and each layer of the two section steel supports (5).
The structure minus one layer (7-1), the existing structure minus two layers (8-1) and the existing structure minus three layers (9-1) are reinforced by heavy equipment and floor slabs on each layer of the construction area side of the underground diaphragm wall (1) through full-space red scaffolds.
A method for reconstructing and reinforcing a structure of a diaphragm wall constructed in an existing underground building is characterized by comprising the following steps:
1) the reinforced concrete partition wall (2) is constructed layer by layer from bottom to top by placing 10cm from the outside of the design contour line of the underground diaphragm wall (1) from the existing structure minus one layer (7-1), the existing structure minus one layer (7-2), the existing structure minus two layers (8-1), the existing structure minus three layers (9-1) and the existing structure minus three layers (9-2) inside a building overlapped with a foundation pit, the reinforced concrete partition wall (2) is effectively connected with each floor slab of the existing structure, each reinforced concrete partition wall (2) is also effectively connected vertically, preparation is made for cutting the corresponding structure stress conversion of the floor slab in the construction range of the underground diaphragm wall, and meanwhile, the reinforced concrete partition wall (2) also has the function of wall guide;
2) after construction of each layer of reinforced concrete partition wall (2) is completed, constructing I-shaped ribbed walls (3) and II-shaped ribbed walls (4) of reinforced concrete by clinging to the back of the partition wall, wherein the I-shaped ribbed walls (3) and the II-shaped ribbed walls (4) are effectively connected with the existing structural top plate (10), the existing structural negative one-layer floor plate (11), the existing structural negative two-layer floor plate (12), the existing structural bottom plate (13) and the reinforced concrete partition wall (2), and the I-shaped ribbed walls (3) and the II-shaped ribbed walls (4) of each layer are also effectively connected in the vertical direction so as to maintain the stability of the reinforced concrete partition wall (2) in the construction stage of the diaphragm wall;
3) pre-grouting and reinforcing the underground diaphragm wall (1) and the stratum below the existing structural bottom plate (13) within a certain plane and depth range by a forward or backward grouting process from a door opening reserved in the existing structural bottom plate (13) and the reinforced concrete partition wall (2) so as to ensure the stability of underground water and foundation soil during the cutting of the bottom plate and the construction of the underground diaphragm wall;
4) one floor (7-1) is arranged below the existing structure in the building, two floors (8-1) are arranged below the existing structure, and three floors (9-1) are arranged below the existing structure in the building, so that the full red scaffold is supported and reinforced on the underground diaphragm wall (1) by heavy equipment and floors on each floor on the construction area side layer by layer from bottom to top, and the arrangement positions of the vertical rods of the supports are kept as consistent as possible from top to bottom so as to cope with the influence of the increased load of construction on the original structure;
5) reserving a door opening from each layer of reinforced concrete partition wall (2) to enter the partition wall, setting up a simple bracket and also serving as a temporary support for floor slab cutting, and horizontally and transversely supporting the reinforced concrete partition wall (2) by using a profile steel support (5) so as to control structural displacement deformation possibly generated after the floor slab cutting;
6) reserving a door opening from each layer of reinforced concrete partition wall (2), entering a middle area between the reinforced concrete partition walls (2) at two sides, cutting a floor slab in the wall body range of the diaphragm wall (1), laying structural deformation monitoring points at the reserved structural range and the reinforced concrete partition wall (2) before cutting, cutting the middle floor slab, then cutting a top plate and a bottom plate, cutting the middle floor slab and the top plate by adopting a wire saw, drilling and coring the bottom plate by adopting a water drill, and strengthening the monitoring on structural deformation in the cutting process;
7) a door opening is reserved in the reinforced concrete partition wall (2), the middle area of the reinforced concrete partition walls (2) on two sides is backfilled by adopting mortar or low-grade concrete according to the engineering scale, or a mode of stirring the cement after the soil is backfilled can be adopted, but the stability of the side wall of the time slot section during the framing construction of the diaphragm wall is ensured;
8) after the strength of the backfilling medium meets the grooving construction requirement of the diaphragm wall, the diaphragm wall construction is developed according to the groove section division and the normal grooving process;
the pre-grouting reinforcement is carried out on the ground connecting wall (1) and the bottom plate of the building under the selected side by adopting a forward or backward grouting process, the reinforcement radius d3 is not less than 3d1 (the thickness of the ground connecting wall), the reinforcement depth h1 is not less than 5d1 (the thickness of the ground connecting wall), the grouting slurry is double-slurry, the bottom plate is perforated by adopting water drilling to guide holes, the hole distribution interval is considered according to 0.8-1.2 m, the number of the primary perforated holes is controlled according to the hole opening condition, and observation and monitoring are enhanced in the grouting reinforcement process.
The reinforced concrete partition wall (2) is horizontally and transversely supported by the section steel supports (5), 22I-shaped steel is adopted for the section steel supports, and the vertical positions are corresponding positions which are 500mm above and below the corresponding elevation of the intermediate floor slab and 500mm away from the bottom of the top plate and the top of the bottom plate; the horizontal spacing of each temporary support is 2000 mm.
Compared with the prior art, the invention has the following advantages:
the invention provides a method for reconstructing and reinforcing a structure of an underground diaphragm wall in an existing underground building, which reconstructs the structure of the building by additionally manufacturing a partition wall and a diaphragm wall guide wall in the building; applying a rib wall closely attached to the back of the partition wall to maintain the stability of the partition wall in the diaphragm wall construction stage; grouting reinforcement is carried out on the diaphragm wall within a certain grooving depth range from the bottom plate of the building so as to ensure the stability of underground water and foundation soil during the cutting of the bottom plate and the construction of the diaphragm wall; carrying out full-space red scaffold reinforcement on each floor in a building so as to cope with the influence of load increased by heavy equipment and construction area construction on an original structure; temporary steel supports are arranged in the newly made partition walls on the two sides for supporting so as to control structural displacement deformation possibly generated after the floor slab is cut; cutting the floor slab of the structure in the grooving range of the diaphragm wall layer by layer and backfilling the space between the two newly-made partition walls to create conditions for the framing construction of the diaphragm wall; deformation settlement influence which may be generated by the existing building is controlled by monitoring deformation of the existing building.
Drawings
FIG. 1 is a schematic sectional view of the construction method of the present invention.
FIG. 2 is a schematic plan view of the construction method of the present invention.
Wherein, in the figure: firstly, connecting the ground with the wall; partition wall; III, forming a rib wall I; fourthly, II type rib walls; supporting temporary section steel; sixthly, grouting reinforcement; seventhly-1-the existing structure is covered with a layer; seventhly-2-the existing structure is covered with a layer; eighty-1-two layers with an existing structure; eighthly-2-two layers with an existing structure (a non-full red scaffold erecting area); ninthly-1-existing structure negative three layers; ninthly-2-existing structure negative three layers; r-existing structural roof; the existing structure bears a floor; water pumping-two-layer floor with negative structure; selection-existing structural backplane; initial feedback-new foundation pit range.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in figures 1 and 2, the method for reconstructing and reinforcing the structure of the underground diaphragm wall in the existing underground building comprises a first floor (7-1) with a negative existing structure, a first floor (7-2) with a negative existing structure, a second floor (8-1) with a negative existing structure, a second floor (8-2) with a negative existing structure, a third floor (9-1) with a negative existing structure, a third floor (9-2) with a negative existing structure, a top plate (10) with an existing structure, a floor (11) with a negative existing structure, a second floor (12) with a negative existing structure and a bottom plate (13) with an existing structure, and is characterized in that the first floor (7-1) with a negative existing structure, the second floor (8-2) with a negative existing structure, the third floor (9-1) with a negative existing structure, the first floor (7-2) with a negative existing structure, and the second floor (8-1) with an existing structure penetrate through the interior of the building, Three layers (9-2) are arranged on the existing structure, and two reinforced concrete partition walls (2) are arranged from the existing structure bottom plate (13) to the existing structure top plate (10) along the underground diaphragm wall (1); i-shaped rib walls (3) are arranged in spaces of a structural negative layer (7-1), an existing structural negative layer (7-2), an existing structural negative second layer (8-1) and an existing structural negative second layer (8-2) at the outer sides of the two reinforced concrete partition walls (2), and II-shaped rib walls (4) are arranged in spaces of an existing structural negative third layer (9-1) and an existing structural negative third layer (9-2); the two reinforced concrete partition walls (2) are horizontally and transversely supported and reinforced through section steel supports (5); the stratum under the existing structural bottom plate (13) and the underground diaphragm wall (1) is reinforced (6) by grouting.
The section steel supports (5) are horizontally and transversely supported and reinforced by the section steel supports (5) through reserving door openings from the underground diaphragm wall (1) to the two reinforced concrete partition walls (2), and each layer of the two section steel supports (5).
The structure minus one layer (7-1), the existing structure minus two layers (8-1) and the existing structure minus three layers (9-1) are reinforced by heavy equipment and floor slabs on each layer of the construction area side of the underground diaphragm wall (1) through full-space red scaffolds.
A method for reconstructing and reinforcing a structure of a diaphragm wall constructed in an existing underground building is characterized by comprising the following steps:
1) the reinforced concrete partition wall (2) is constructed layer by layer from bottom to top by placing 10cm from the outside of the design contour line of the underground diaphragm wall (1) from the existing structure minus one layer (7-1), the existing structure minus one layer (7-2), the existing structure minus two layers (8-1), the existing structure minus three layers (9-1) and the existing structure minus three layers (9-2) inside a building overlapped with a foundation pit, the reinforced concrete partition wall (2) is effectively connected with each floor slab of the existing structure, each reinforced concrete partition wall (2) is also effectively connected vertically, preparation is made for cutting the corresponding structure stress conversion of the floor slab in the construction range of the underground diaphragm wall, and meanwhile, the reinforced concrete partition wall (2) also has the function of wall guide;
2) after construction of each layer of reinforced concrete partition wall (2) is completed, constructing I-shaped ribbed walls (3) and II-shaped ribbed walls (4) of reinforced concrete by clinging to the back of the partition wall, wherein the I-shaped ribbed walls (3) and the II-shaped ribbed walls (4) are effectively connected with the existing structural top plate (10), the existing structural negative one-layer floor plate (11), the existing structural negative two-layer floor plate (12), the existing structural bottom plate (13) and the reinforced concrete partition wall (2), and the I-shaped ribbed walls (3) and the II-shaped ribbed walls (4) of each layer are also effectively connected in the vertical direction so as to maintain the stability of the reinforced concrete partition wall (2) in the construction stage of the diaphragm wall;
3) pre-grouting and reinforcing the underground diaphragm wall (1) and the stratum below the existing structural bottom plate (13) within a certain plane and depth range by a forward or backward grouting process from a door opening reserved in the existing structural bottom plate (13) and the reinforced concrete partition wall (2) so as to ensure the stability of underground water and foundation soil during the cutting of the bottom plate and the construction of the underground diaphragm wall;
4) one floor (7-1) is arranged below the existing structure in the building, two floors (8-1) are arranged below the existing structure, and three floors (9-1) are arranged below the existing structure in the building, so that the full red scaffold is supported and reinforced on the underground diaphragm wall (1) by heavy equipment and floors on each floor on the construction area side layer by layer from bottom to top, and the arrangement positions of the vertical rods of the supports are kept as consistent as possible from top to bottom so as to cope with the influence of the increased load of construction on the original structure;
5) reserving a door opening from each layer of reinforced concrete partition wall (2) to enter the partition wall, setting up a simple bracket and also serving as a temporary support for floor slab cutting, and horizontally and transversely supporting the reinforced concrete partition wall (2) by using a profile steel support (5) so as to control structural displacement deformation possibly generated after the floor slab cutting;
6) reserving a door opening from each layer of reinforced concrete partition wall (2), entering a middle area between the reinforced concrete partition walls (2) at two sides, cutting a floor slab in the wall body range of the diaphragm wall (1), laying structural deformation monitoring points at the reserved structural range and the reinforced concrete partition wall (2) before cutting, cutting the middle floor slab, then cutting a top plate and a bottom plate, cutting the middle floor slab and the top plate by adopting a wire saw, drilling and coring the bottom plate by adopting a water drill, and strengthening the monitoring on structural deformation in the cutting process;
7) a door opening is reserved in the reinforced concrete partition wall (2), the middle area of the reinforced concrete partition walls (2) on two sides is backfilled by adopting mortar or low-grade concrete according to the engineering scale, or a mode of stirring the cement after the soil is backfilled can be adopted, but the stability of the side wall of the time slot section during the framing construction of the diaphragm wall is ensured;
8) after the strength of the backfilling medium meets the grooving construction requirement of the diaphragm wall, the diaphragm wall construction is developed according to the groove section division and the normal grooving process;
the pre-grouting reinforcement is carried out on the ground connecting wall (1) and the bottom plate of the building under the selected side by adopting a forward or backward grouting process, the reinforcement radius d3 is not less than 3d1 (the thickness of the ground connecting wall), the reinforcement depth h1 is not less than 5d1 (the thickness of the ground connecting wall), the grouting slurry is double-slurry, the bottom plate is perforated by adopting water drilling to guide holes, the hole distribution interval is considered according to 0.8-1.2 m, the number of the primary perforated holes is controlled according to the hole opening condition, and observation and monitoring are enhanced in the grouting reinforcement process.
The reinforced concrete partition wall (2) is horizontally and transversely supported by the section steel supports (5), 22I-shaped steel is adopted for the section steel supports, and the vertical positions are corresponding positions which are 500mm above and below the corresponding elevation of the intermediate floor slab and 500mm away from the bottom of the top plate and the top of the bottom plate; the horizontal spacing of each temporary support is 2000 mm.
Claims (6)
1. A method for reconstructing and reinforcing a structure of a ground connection wall for constructing a foundation pit in an existing building comprises a first floor (7-1) with a negative existing structure, a first floor (7-2) with a negative existing structure, a second floor (8-1) with a negative existing structure, a second floor (8-2) with a negative existing structure, a third floor (9-1) with a negative existing structure, a third floor (9-2) with a negative existing structure, a top plate (10) with an existing structure, a floor (11) with a negative existing structure, a second floor (12) with a negative existing structure and a bottom plate (13) with an existing structure, and is characterized in that the first floor (7-1) with a negative existing structure, the second floor (8-2) with a negative existing structure, the third floor (9-1) with a negative existing structure, the first floor (7-2) with a negative existing structure, the second floor (8-1) with a negative existing structure and the third floor (9-2) with a negative structure penetrate through the interior of the building, two reinforced concrete partition walls (2) are arranged along the underground diaphragm wall (1) from the existing structure bottom plate (13) to the existing structure top plate (10); i-shaped rib walls (3) are arranged in spaces of a structural negative layer (7-1), an existing structural negative layer (7-2), an existing structural negative second layer (8-1) and an existing structural negative second layer (8-2) at the outer sides of the two reinforced concrete partition walls (2), and II-shaped rib walls (4) are arranged in spaces of an existing structural negative third layer (9-1) and an existing structural negative third layer (9-2); the two reinforced concrete partition walls (2) are horizontally and transversely supported and reinforced through section steel supports (5); the stratum under the existing structural bottom plate (13) and the underground diaphragm wall (1) is reinforced (6) by grouting.
2. The method for reconstructing and reinforcing the structure of the underground diaphragm wall for the foundation pit in the existing building according to claim 1, wherein the profile steel supports (5) are horizontally and transversely supported and reinforced by the profile steel supports (5) for two reinforced concrete partition walls (2) through reserving door openings from the underground diaphragm wall (1), and each layer of the two profile steel supports (5) are arranged.
3. The method for reconstructing and reinforcing the structure of the underground diaphragm wall for the foundation pit in the existing building according to the claim 1, wherein the structure minus one floor (7-1), the structure minus two floors (8-1) and the structure minus three floors (9-1) are reinforced by heavy equipment and floor slabs on each floor at the side of the construction area through full red scaffolds.
4. A method for reconstructing and reinforcing a structure of a foundation pit diaphragm wall constructed in an existing building is characterized by comprising the following steps:
1) the reinforced concrete partition wall (2) is constructed layer by layer from bottom to top by placing 10cm from the outside of the design contour line of the underground diaphragm wall (1) from the existing structure minus one layer (7-1), the existing structure minus one layer (7-2), the existing structure minus two layers (8-1), the existing structure minus three layers (9-1) and the existing structure minus three layers (9-2) inside a building overlapped with a foundation pit, the reinforced concrete partition wall (2) is effectively connected with each floor slab of the existing structure, each reinforced concrete partition wall (2) is also effectively connected vertically, preparation is made for cutting the corresponding structure stress conversion of the floor slab in the construction range of the underground diaphragm wall, and meanwhile, the reinforced concrete partition wall (2) also has the function of wall guide;
2) after construction of each layer of reinforced concrete partition wall (2) is completed, constructing I-shaped ribbed walls (3) and II-shaped ribbed walls (4) of reinforced concrete by clinging to the back of the partition wall, wherein the I-shaped ribbed walls (3) and the II-shaped ribbed walls (4) are effectively connected with the existing structural top plate (10), the existing structural negative one-layer floor plate (11), the existing structural negative two-layer floor plate (12), the existing structural bottom plate (13) and the reinforced concrete partition wall (2), and the I-shaped ribbed walls (3) and the II-shaped ribbed walls (4) of each layer are also effectively connected in the vertical direction so as to maintain the stability of the reinforced concrete partition wall (2) in the construction stage of the diaphragm wall;
3) pre-grouting and reinforcing the underground diaphragm wall (1) and the stratum below the existing structural bottom plate (13) within a certain plane and depth range by a forward or backward grouting process from a door opening reserved in the existing structural bottom plate (13) and the reinforced concrete partition wall (2) so as to ensure the stability of underground water and foundation soil during the cutting of the bottom plate and the construction of the underground diaphragm wall;
4) one floor (7-1) is arranged below the existing structure in the building, two floors (8-1) are arranged below the existing structure, and three floors (9-1) are arranged below the existing structure in the building, so that the full red scaffold is supported and reinforced on the underground diaphragm wall (1) by heavy equipment and floors on each floor on the construction area side layer by layer from bottom to top, and the arrangement positions of the vertical rods of the supports are kept as consistent as possible from top to bottom so as to cope with the influence of the increased load of construction on the original structure;
5) reserving a door opening from each layer of reinforced concrete partition wall (2) to enter the partition wall, setting up a simple bracket and also serving as a temporary support for floor slab cutting, and horizontally and transversely supporting the reinforced concrete partition wall (2) by using a profile steel support (5) so as to control structural displacement deformation possibly generated after the floor slab cutting;
6) reserving a door opening from each layer of reinforced concrete partition wall (2), entering a middle area between the reinforced concrete partition walls (2) at two sides, cutting a floor slab in the wall body range of the diaphragm wall (1), laying structural deformation monitoring points at the reserved structural range and the reinforced concrete partition wall (2) before cutting, cutting the middle floor slab, then cutting a top plate and a bottom plate, cutting the middle floor slab and the top plate by adopting a wire saw, drilling and coring the bottom plate by adopting a water drill, and strengthening the monitoring on structural deformation in the cutting process;
7) a door opening is reserved in the reinforced concrete partition wall (2), the middle area of the reinforced concrete partition walls (2) on two sides is backfilled by adopting mortar or low-grade concrete according to the engineering scale, or a mode of stirring the cement after the soil is backfilled can be adopted, but the stability of the side wall of the time slot section during the framing construction of the diaphragm wall is ensured;
8) and after the strength of the backfilling medium meets the grooving construction requirement of the diaphragm wall, carrying out diaphragm wall construction according to the groove section division and the normal grooving process.
5. The method for improving and reinforcing the structure of the underground diaphragm wall of the foundation pit in the existing building according to claim 4, wherein the underground diaphragm wall (1) and the bottom plate of the building are pre-grouted and reinforced by adopting a forward or backward grouting process under the reference of the ground diaphragm wall and the bottom plate of the building, the reinforcement radius d3 is not less than 3d1 (the thickness of the underground diaphragm wall), the reinforcement depth h1 is not less than 5d1 (the thickness of the underground diaphragm wall), the grouting slurry is double-fluid slurry, the holes of the bottom plate are drilled by water, the hole distribution distance is considered to be 0.8-1.2 m, the number of the holes is controlled according to the hole opening condition, and the observation and the monitoring are enhanced in the grouting and reinforcing process.
6. The method for reconstructing and reinforcing the structure of the underground diaphragm wall of the foundation pit in the existing building according to the claim 4, wherein the reinforced concrete partition wall (2) is horizontally and transversely supported by the section steel support (5), 22I-shaped steel is adopted for the section steel support, and the vertical position is the corresponding position 500mm above and below the corresponding elevation of the middle floor slab and 500mm away from the bottom of the top plate and the top of the bottom plate; the horizontal spacing of each temporary support is 2000 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110872117.9A CN113373998A (en) | 2021-07-30 | 2021-07-30 | Structure reconstruction and reinforcement method for constructing diaphragm wall in existing underground building |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110872117.9A CN113373998A (en) | 2021-07-30 | 2021-07-30 | Structure reconstruction and reinforcement method for constructing diaphragm wall in existing underground building |
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| Publication Number | Publication Date |
|---|---|
| CN113373998A true CN113373998A (en) | 2021-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110872117.9A Pending CN113373998A (en) | 2021-07-30 | 2021-07-30 | Structure reconstruction and reinforcement method for constructing diaphragm wall in existing underground building |
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2021
- 2021-07-30 CN CN202110872117.9A patent/CN113373998A/en active Pending
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