CN110565978B - Control method and structure of confined water in existing basement storey-adding construction - Google Patents
Control method and structure of confined water in existing basement storey-adding construction Download PDFInfo
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- CN110565978B CN110565978B CN201910855339.2A CN201910855339A CN110565978B CN 110565978 B CN110565978 B CN 110565978B CN 201910855339 A CN201910855339 A CN 201910855339A CN 110565978 B CN110565978 B CN 110565978B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0266—Enlarging
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/06—Separating, lifting, removing of buildings; Making a new sub-structure
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Abstract
The invention discloses a control method and a structure of confined water in the layer-adding construction of an existing basement, wherein the method comprises the steps of respectively constructing a pressure-reducing well and an observation well inside and outside a layer-adding enclosure structure, and constructing a project pile and a bored pile; removing the existing BM layer floor slab, excavating a soil body to a preset depth to form a foundation pit, and constructing a BN layer floor slab at the bottom of the foundation pit, wherein M, N is an integer greater than 0, and N is greater than M; and constructing a BN-1 floor slab to a BM+1 floor slab on the BN floor slab, and reconstructing the BM floor slab to a B0 floor slab. Before the engineering pile, the bored pile and/or the soil body are excavated, the pressure-reducing well is started or closed according to the water level height change in the observation well, and the water level height of the pressure-bearing water in the existing basement layer-increasing construction is controlled to be reduced so as not to influence the engineering pile, the bored pile and/or the soil body excavation construction. The invention reduces the difficulty of the basement storey-adding construction and improves the construction safety by controlling the pressure-bearing water.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a control method of confined water in the layer-adding construction of an existing basement and the structure of the existing basement.
Background
In the technical field of construction engineering, with the development of urban modernization, the contradiction and problems of urban land resource and space development are increasingly prominent, and the utilization of underground space is continuously three-dimensional. The problem of congestion in-situ underground spaces, such as parking difficulties in transportation hub stations, large venues, commercial buildings and residential communities, has become increasingly prominent, severely impacting the sustainable development of cities. Therefore, reasonable development and utilization of the space below the basement of the existing building in the city are one of the effective ways for solving the contradiction between urban land resource and space development. However, in the soil environment involving the confined water in the construction of the storey addition of the existing basement, when the confined water is drilled, the upward water gushes out influences the safety and difficulty of the construction of the storey addition of the existing basement, wherein the confined water fills the groundwater in the aquifer between the two water-resistant layers. Therefore, how to control the bearing water in the basement storey-adding construction to reduce the construction difficulty and the safety construction becomes a technical problem to be solved in the field.
Disclosure of Invention
The invention aims to solve the technical problem of providing a control method and a structure of pressure-bearing water in the layer-adding construction of the existing basement so as to solve the problem of pressure-bearing water in the layer-adding construction of the existing basement.
In order to solve the technical problems, the invention provides a control method of pressure-bearing water in the existing basement storey-adding construction,
constructing a depressurization well in the storey-adding enclosure structure, and constructing an observation well at the periphery of the storey-adding enclosure structure, wherein the construction depth of the depressurization well is the same as that of the observation well;
the method comprises the steps of downwards constructing engineering piles from an existing B0 layer floor slab to an existing BM layer floor slab of an existing basement, wherein the depth of the engineering piles is larger than the design depth of the basement storey addition, and the depth of a pressure reduction well is larger than the depth of the engineering piles;
dismantling an existing B0 layer floor slab of the existing basement to an existing BM-1 layer floor slab, and constructing a bored pile downwards along the existing BM layer floor slab of the existing basement, wherein the depth of the depressurization well is smaller than that of the bored pile;
removing an existing BM layer floor slab of an existing basement, excavating soil to a preset depth to form a foundation pit, arranging foundation pit supports on the periphery of the foundation pit, and constructing a BN layer floor slab at the bottom of the foundation pit, wherein M, N is an integer greater than 0, and N is greater than M;
sequentially removing foundation pit supports upwards, constructing BN-1 floor slabs to BM+1 floor slabs on the BN floor slabs by adopting a forward method, and reconstructing BM floor slabs to B0 floor slabs on the BM+1 floor slabs, wherein N-M is the number of newly added basement layers;
when the engineering pile and/or the bored pile are constructed, the pressure-reducing well is started or closed according to the water level height change in the observation well, and the water level height of the pressure-bearing water in the basement layer-adding construction is controlled to be reduced so as not to influence the construction of the engineering pile and/or the bored pile and prevent the pressure-bearing water from overflowing from the pile hole;
before soil body excavation, the pressure reduction well is started or closed according to the water level height change in the observation well, and the water level height of the pressure-bearing water in basement layer-increasing construction is controlled to be reduced below an excavation surface.
Further, according to the control method for the pressurized water in the existing basement storey-adding construction, after the BN storey floor is constructed, the pressure reducing well is removed, and a well below the BN storey floor after the pressure reducing well is removed is plugged.
Furthermore, the control method of the pressure-bearing water in the existing basement storey-adding construction is characterized in that a recharging well is constructed on the periphery of the storey-adding enclosure structure while a pressure-reducing well and an observation well are constructed, and recharging water is carried out according to the water level height in the recharging well in the construction engineering pile, the drilling filling pile and/or the soil body excavation process.
Further, the control method for the pressure-bearing water in the existing basement storey-adding construction provided by the invention is that the pumping equipment is adopted to pump the pressure-bearing well by starting the pressure-bearing well; closing the depressurization well means that the pumping equipment stops pumping water to the depressurization well.
Further, the pressure-reducing well comprises a well formed by drilling, a mouth guard pipe, a well wall pipe, a water filtering pipe and a sedimentation pipe which are sequentially connected in the well, and an iron plate for sealing the bottom opening of the sedimentation pipe, wherein the mouth guard pipe is higher than the ground level of the well.
Further, according to the control method for the pressure-bearing water in the layer-adding construction of the existing basement, when the bored pile is constructed, the pressure-bearing water is resisted by using the high-specific-gravity slurry, and then the pressure-reducing well is closed, wherein the slurry specific gravity of the high-specific-gravity slurry is 12kN/m 3 The above.
Further, according to the control method for the pressurized water in the existing basement storey-adding construction, after the pressure-reducing well is closed, the pressurized water is discharged in a mode of opening holes in an outward pressure releasing mode.
In the control method for the confined water in the storey-adding construction of the existing basement, after the construction of the engineering pile, before the existing B0 storey building plate of the existing basement is removed, a trestle is constructed on the storey-adding enclosure structure, and the trestle is connected with the engineering pile.
The invention provides a control structure of pressure-bearing water in the existing basement storey-adding construction, which comprises a storey-adding enclosing structure arranged on the periphery of the existing enclosing structure of the existing basement, a pressure reduction well positioned in the storey-adding enclosing structure, and an observation well positioned on the periphery of the storey-adding enclosing structure, wherein the depth of the pressure reduction well is the same as that of the observation well, the depth of the pressure reduction well is larger than that of the engineering pile, and the depth of the pressure reduction well is smaller than that of the bored pile.
Furthermore, the control structure of the pressure-bearing water in the existing basement storey-adding construction provided by the invention comprises a well formed by drilling, a mouth guard pipe, a well wall pipe, a water filtering pipe and a sedimentation pipe which are sequentially connected in the well, and an iron plate for sealing the bottom opening of the sedimentation pipe, wherein the mouth guard pipe is higher than the ground level of the well.
Compared with the prior art, the control method and the structure for the confined water in the existing basement layer-adding construction can control the water level change of the confined water according to the starting or closing of the pressure reduction well when facing the soil environment of the underground water layer such as the confined water in the existing basement layer-adding construction, and the confined water is controlled in the pipeline of the pressure reduction well without overflowing into the existing basement and foundation pit, so that the layer-adding construction of the existing basement is not affected. And (3) starting or closing the pressure-reducing well according to the water level height change in the observation well at the construction engineering pile and/or the bored pile, and controlling the water level height of the pressure-bearing water in the basement layer-increasing construction to be reduced so as not to influence the construction of the engineering pile and/or the bored pile and prevent the pressure-bearing water from overflowing from the pile hole to influence the basement layer-increasing construction. Before soil excavation, the pressure reduction well is started or closed according to the water level height change in the observation well, and the water level height of the pressure-bearing water in the basement layer-increasing construction is controlled to be reduced below an excavation surface, so that the difficulty and the progress of soil excavation in the basement layer-increasing construction are not affected by the pressure-bearing water. The control method and the structure for the pressure-bearing water in the existing basement storey-adding construction reduce the difficulty of the existing basement storey-adding construction and improve the construction safety.
Drawings
FIGS. 1 to 7 are process diagrams of a method for adding layers to an existing basement and a method for controlling pressurized water in layer-adding construction according to an embodiment of the present invention;
FIG. 8 is a flow chart of an existing basement layering method in accordance with an embodiment of the present invention;
fig. 9 is a flowchart of a method for controlling pressurized water in an existing basement layer-adding construction according to an embodiment of the present invention.
The figure shows: 111. the existing water stop piles, 112, the existing underground continuous wall, 113, the existing support replacing beams, 114, the existing support replacing plates, 121, the existing B0 layer floor, 122, the existing BM-1 layer floor, 123, the existing BM layer floor, 124, the existing outer wall, 125, the existing vertical supporting columns, 201, the added underground surrounding wall, 202, the added water stop piles, 203, ring beams, 204, open holes, 205, engineering piles, 206, bored piles, 207, BN layer floors, 208, BN-1 layer floors, 209, BM layer floors, 210, BM-1 layer floors, 211, B0 layer floors, 300, water drilling machines, 401, trestle, 402, foundation pit supports, 501, depressurization wells, 502, observation wells, 503, recharge wells, 504 and wellways.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
referring to fig. 1, the existing basement is M layers, where M is an integer greater than 0. The embodiment of the invention is described in detail by taking two-layer existing basements with m=2 as an example. The existing basement comprises an existing enclosure structure, a first basement layer and a second basement layer. The existing enclosure structure comprises an existing underground diaphragm 112, a waterproof curtain formed by existing waterproof piles 111 arranged on the periphery of the existing underground diaphragm 112, and an existing support beam 113 and an existing support plate 114 arranged on the inner side of the waterproof curtain. The existing basement further includes an existing B0 floor 121, an existing BM-1 floor 122, and an existing BM floor, an existing outer wall 124 located inside the existing spreader 113, and an existing vertical support column 125 disposed between the floors. Wherein the existing B0 floor 121, the existing BM-1 floor 122, and the existing exterior wall 124 constitute a basement layer. Wherein the existing BM-1 floor 122, the existing BM floor and the existing outer wall 124 constitute the basement two layers.
Example 1
Referring to fig. 8, a first embodiment of the present invention provides a method for adding floors of an existing basement, wherein the number of floors of the existing basement is set to m=3, and a new floor is set to l=2, and the method includes:
in step 601, please refer to fig. 1, a build-up building envelope is constructed around the existing building envelope of the M-layer existing basement, wherein M is an integer greater than 0. The storey-adding enclosure structure comprises a storey-adding underground enclosure wall 201, a waterproof curtain formed by storey-adding water-stopping piles 202 positioned on the periphery of the storey-adding underground enclosure wall 201, and a ring beam 203 arranged at the top end of the storey-adding underground enclosure wall 201, wherein the ring beam 203 is in contact connection with the storey-adding water-stopping piles 202. The collar beam 203 can improve structural stability of the enhanced underground diaphragm wall 201.
In step 602, referring to fig. 2, the engineering pile 205 is constructed downward through the existing B0 floor 121 to the existing BM floor 123 of the existing basement. The engineering piles 205 include lattice columns located above the existing basement and column piles connected to the lattice columns, the column piles being located below the existing basement. Referring to fig. 1 to 2, prior to construction of the engineered pile 205, the steps of tapping 204 the existing B0 floor 121 to the existing BM floor 123 are included, and the engineered pile 205 passes through the tapping 204.
Step 603, please refer to fig. 3, remove the existing B0 floor 121 to the existing BM-1 floor 122 of the existing basement, drill the existing BM floor 123 of the existing basement, and construct the bored pile 206 downward. In step 603, the bored pile 206 adopts a post grouting method to improve its bearing capacity, and seals the pile body gap, and checks the sealing performance of all bored piles 206, so as to avoid the leakage of the bearing water along the pile holes of the bored piles 206.
Step 604, please refer to fig. 4-5, remove the existing BM floor 123 of the existing basement, excavate the soil to a predetermined depth to form a foundation pit, set a foundation pit support 402 on the periphery of the foundation pit, construct BN floor 207 at the bottom of the foundation pit, where N is an integer greater than 0 and N > M; the foundation pit support 402 can ensure horizontal bearing capacity and prevent the risk of falling off and collapsing of the wall body of the foundation pit in the construction process. The foundation pit support 402 can be increased or decreased according to the number of layers of the basement. The foundation pit supports 402 are multiple, and the adjacent foundation pit supports 402 can be arranged at intervals of 2 meters to 3 meters.
In step 605, referring to fig. 6 to 7, the pit support 402 is removed sequentially upwards, and BN-1 floor 208 to bm+1 floor are constructed on BN floor 207 by forward method, and BM floor 209 to B0 floor 211 are reconstructed on bm+1 floor, where N-M is the number of newly added basement layers L. Since the number of floor layers of the existing basement is set to be m=3, and the number of newly added floors is set to be l=2. So in step 506, BN-1 floor 208 is equal to bm+1 floor. The embodiment of the invention is not limited to newly adding two floors, but also is not limited to adding floors to the existing basement with the floor number of 3 floors.
Referring to fig. 1 to 7, a first embodiment of the present invention further provides an existing basement storey-adding structure, which includes a storey-adding building structure constructed to cover the periphery of an existing building structure of an existing basement, dismantling reconstructed BM layer floors 209 to B0 layer floor 211 and constructed bm+1 layer floor to BN layer floor 207, and bored piles 206 and engineering piles 205 disposed downward along the BN layer floor 207.
In the first embodiment of the present invention, a four-layer basement structure is formed, wherein the two-layer basement structure is formed by removing the reconstructed BM layer floor 209 to B0 layer floor 211 to form a newly added two-layer basement structure from the BM layer floor 209 to BN layer floor 207. That is, the embodiment of the invention expands the structure of the existing two-layer basement and increases the two-layer basement, thereby carrying out secondary development and utilization on the underground space of the existing building and reasonably and effectively developing the land resources of the existing city. The building and the underground space are protected by the layer-added enclosure structure in terms of structural stability, and the engineering pile 205 is constructed from the existing B0 layer floor 121 to the existing BM layer floor 123, so that the protection of the structural stability of the existing building and collapse prevention can be further ensured when the layer-added construction of the underground space is performed. Bored pile 206 is constructed to form a vertical support system for the underground space to ensure the safety and stability of the existing building. The soil body is excavated to the preset depth to form the depth for increasing the underground space, so that the newly-built increased floor layer number is used for expanding, developing and utilizing the existing basement, and the stability and safety of the expanded underground space construction can be further protected by constructing and arranging the foundation pit support 402 in the normal construction method. The invention discloses an existing basement storey-adding structure, which realizes the storey-adding purpose of an existing basement by covering the storey-adding enclosure structure of the existing basement and dismantling the rebuilt BM layer floor slabs 209 to B0 floor slab 211 and the constructed BM+1 layer floor slab to BN floor slab 207. The expanded underground space and the existing building thereof are supported by the bored pile 206, thereby protecting the underground space and the existing building and ensuring construction safety. The existing basement storey-adding structure has the effects of simple structure and high safety.
Referring to fig. 2, in the method for adding layers to an existing basement according to the first embodiment of the present invention, after construction of a engineering pile 205, before removing an existing B0 floor 121 of the existing basement, a trestle 401 is further constructed between added underground walls 201, and the trestle 401 is connected with the engineering pile 205. Trestle 401 serves as a traffic channel for construction on the one hand and serves as a first foundation pit support in foundation pit supports on the other hand. The trestle 401 is connected with the engineering pile 205, so that the stability of the trestle 401 can be protected, and risks such as deformation, collapse and falling of the trestle 401 are prevented. Trestle 401 can guarantee horizontal bearing capacity.
Referring to fig. 3, in the method for increasing the floor of the existing basement according to the first embodiment of the present invention, a water drilling machine 300 is used to drill holes on the existing BM floor 123 of the existing basement.
Referring to fig. 4 to 7, in the method for adding a floor of an existing basement according to the first embodiment of the present invention, when soil is excavated to a predetermined depth, the existing enclosure structure of the existing basement is removed. The existing enclosure structure is removed, so that on one hand, the structural stability of the newly formed underground space can be guaranteed, and on the other hand, the area of the underground space can be increased.
In order to ensure construction safety, in the method for adding floors of an existing basement according to the first embodiment of the present invention, after the existing B0 floor 121 to the existing BM-1 floor 122 of the existing basement are removed, horizontal supports are provided before the existing BM floor 123 of the existing basement is drilled.
In order to ensure the structural stability of the underground space after the storey addition, in the storey addition method of the existing basement provided by the embodiment of the invention, vertical support columns are arranged between the rebuilding B0 storey building 211 and the BM storey building 209 and between the constructed BM+1 storey building and the adjacent storey building 207.
Example two
Referring to fig. 9, a method for controlling pressurized water in a layer-adding construction of an existing basement according to a second embodiment of the present invention includes:
step 701, please refer to fig. 1, a depressurization well 501 is constructed in the build-up enclosure, an observation well 502 is constructed at the periphery of the build-up enclosure, and the construction depth of the depressurization well 501 is the same as the construction depth of the observation well 502;
step 702, please refer to fig. 2, of constructing a engineering pile 205 downward through the existing B0 floor 121 to the existing BM floor 123 of the existing basement, wherein the depth of the engineering pile 205 is greater than the design depth of the basement storey addition, and the depth of the pressure-reducing well 501 is greater than the depth of the engineering pile 205;
step 703, please refer to fig. 3, dismantling the existing B0 floor 121 to the existing BM-1 floor 122 of the existing basement, and constructing a bored pile 206 downwards along the existing BM floor 123 of the existing basement, where the depth of the depressurization well 510 is smaller than the depth of the bored pile 206;
step 704, please refer to fig. 4-5, remove the existing BM layer floor 123 of the existing basement, excavate the soil to a predetermined depth to form a foundation pit, set a foundation pit support on the periphery of the foundation pit, construct BN layer floor 207 at the bottom of the foundation pit, wherein M, N is an integer greater than 0, and N > M;
in step 705, referring to fig. 6 to 7, the foundation pit support is removed sequentially upwards, and BN-1 floor 208 to bm+1 floor are constructed on BN floor by forward method, and BM floor 209 to B0 floor 211 are reconstructed on bm+1 floor, where N-M is the number of basement layers added.
Step 706, when the engineering pile 205 and/or the bored pile 206 are constructed, determining to start or close the pressure-reducing well 501 according to the change of the water level height in the observation well 502, and controlling the water level height of the pressure-bearing water in the basement layer-adding construction to be reduced so as not to influence the construction of the engineering pile 205 and/or the bored pile 206 and prevent the pressure-bearing water from overflowing from the pile hole;
step 707, before soil excavation, determining to start or close the pressure reduction well 501 according to the water level height change in the observation well 502, and controlling the water level height of the pressure-bearing water in the basement layer-increasing construction to be reduced below the excavation surface.
The control method of the pressurized water in the existing basement layer-adding construction provided by the second embodiment of the invention includes, but is not limited to, the layer-adding method and structure of the existing basement of the first embodiment.
In the control method for pressurized water in the existing basement storey-adding construction provided by the second embodiment of the invention, after constructing the BN floor 207, the relief well 501 is removed, and the well 504 below the BN floor 207 after removing the relief well 501 is plugged. After the well 504 is plugged, the basement structure after the basement is added with layers can be more stable.
According to the control method for the confined water in the existing basement storey-adding construction provided by the embodiment of the invention, the recharging well 503 is constructed at the periphery of the storey-adding enclosure structure while the pressure reducing well 501 and the observation well 502 are constructed, and the recharging is performed according to the water level height in the recharging well 503 in the construction engineering pile 205, the drilling filling pile 206 and/or the soil body excavation process. Wherein the construction depth of the recharging well 503 is the same as the construction depth of the observation well 502. Recharging the recharging well 503 can ensure that the water level of the groundwater around the foundation pit is stable.
In the control method for pressurized water in the existing basement storey-adding construction provided by the second embodiment of the invention, before the construction of the engineering pile or the bored pile, the start or the close of the pressure reduction well 501 is determined according to the water level height change in the observation well 502. Since the depth of the observation well 502 is the same as the depth of the depressurization well 501, the water level change in the observation well 502 can reflect the water level change of the depressurization well 501.
In order to improve stability of the basement structure after the storey addition, please refer to fig. 2 to 5, in the control method of the pressurized water in the storey addition construction of the existing basement provided by the second embodiment of the present invention, the construction depth of the depressurization well 501 is greater than the construction depth of the engineering pile 205, and the construction depth of the depressurization well 501 is less than the construction depth of the bored pile 206. The construction depth of the pressure reduction well 501 is greater than that of the engineering pile 205, so that the construction difficulty of the engineering pile 205 can be reduced, and the adverse effect of the pressure-bearing water on the construction of the engineering pile 205 and drilling can be overcome.
In the control method for the confined water in the layer-adding construction of the existing basement provided by the embodiment of the invention, the step-down well 501 is started, namely, the step-down well 501 is pumped by adopting pumping equipment so as to reduce the water level of the confined water; closing the depressurization well 501 means that the pumping equipment stops pumping water to the depressurization well 501.
In the control method for pressure-bearing water in the existing basement storey-adding construction provided by the second embodiment of the invention, the depressurization well 501 comprises a well 504 formed by drilling, a mouth guard pipe, a well wall pipe, a water filtering pipe and a sedimentation pipe which are sequentially connected in the well 504 and are used for wrapping a nylon filter screen, and an iron plate for sealing the bottom opening of the sedimentation pipe, wherein the mouth guard pipe is higher than the ground level of the well 504. The arrangement of the mouth guard can prevent the surface sewage from penetrating into the pressure reducing well 501. The construction method of the pressure reducing well 501 comprises the steps of arranging the pressure reducing well 501, measuring and paying off to determine the position of the pressure reducing well, adopting a water drilling machine to clean the floor slab of the existing basement BM layer at the corresponding position, installing the drilling machine after embedding a mouth protecting pipe, and drilling to form a hole; after the holes are cleared, a well wall pipe, a water filtering pipe wrapping a nylon filter screen and a sedimentation pipe are lowered, secondary hole clearing is carried out to form a well, filter materials are filled in the well, after the well is sealed by clay, a pressure reducing well is washed, and water pumping equipment such as a water pump is installed for water pumping test. The wellhead of the depressurization well 501 is about 0.5m above ground level. The well wall pipe adopts welded steel pipes. Wherein the diameters of the well wall pipe, the water filtering pipe wrapping the nylon filter screen and the sedimentation pipe are the same.
In the control method for pressure-bearing water in the layer-adding construction of the existing basement provided by the embodiment of the invention, when the bored pile is constructed, the pressure-bearing water is resisted by using the high-specific-gravity slurry, and then the pressure-reducing well 501 is closed, wherein the slurry specific gravity of the high-specific-gravity slurry is 12kN/m 3 The above. The high-specific gravity slurry can prevent the pressure-bearing water from overflowing into the bored pile, so that the structural stability of the bored pile is improved. Closing the depressurization well 501 has the effect of saving energy and reducing emission. After the pressure reducing well 501 is closed, the pressure is relieved outwards by adopting a hole opening mode to discharge the pressure-bearing water.
Referring to fig. 1 to 7, a second embodiment of the present invention provides a control structure for pressurized water in the construction of an existing basement, which includes an increased-layer enclosure structure disposed at the periphery of the existing enclosure structure of the existing basement, a pressure-reducing well 501 disposed within the increased-layer enclosure structure, and an observation well 502 disposed at the periphery of the increased-layer enclosure structure, wherein the depth of the pressure-reducing well 501 is the same as the depth of the observation well 502, the depth of the pressure-reducing well 501 is greater than the depth of the engineering pile, and the depth of the pressure-reducing well 501 is less than the depth of the bored pile. The depressurization wells 501 are staggered from the engineered piles 205 and bored piles 206.
In the control structure for pressurized water in the existing basement storey-adding construction provided by the second embodiment of the present invention, the depressurization well 501 and the observation well 502 each include a well 504 formed by drilling, a mouth guard, a well wall pipe, a water filtering pipe and a sedimentation pipe which are sequentially connected in the well 504 and wrap a nylon filter screen, and an iron plate for sealing the bottom opening of the sedimentation pipe, where the mouth guard is higher than the ground plane of the well 504. The mouth guard of the relief well 501 is above the ground level of the hoistway 504 to prevent surface sewage from penetrating into the relief well 501.
In the control method and structure for the confined water in the layer-adding construction of the existing basement provided by the embodiment of the invention, when the soil environment of the underground water layer such as the confined water is faced in the layer-adding construction of the existing basement, the water level change of the confined water can be controlled according to the starting or closing of the pressure reduction well 501, and the confined water is controlled in the pipeline of the pressure reduction well 501 without overflowing into the existing basement and the foundation pit, so that the layer-adding construction of the existing basement is not affected. And (3) starting or closing the pressure reducing well 501 according to the water level height change in the observation well 502 at the construction engineering pile 205 and/or the bored pile 206, and controlling the water level height reduction of the pressure bearing water in the basement layer-increasing construction so as not to influence the construction of the engineering pile 205 and/or the bored pile 206 and prevent the pressure bearing water from overflowing from the pile hole to influence the basement layer-increasing construction. Before soil excavation, the pressure reduction well 501 is started or closed according to the water level height change in the observation well 502, and the water level of the pressure-bearing water in the basement layer-increasing construction is controlled to be reduced below an excavation surface, so that the difficulty and the progress of soil excavation in the basement layer-increasing construction are not affected by the pressure-bearing water.
According to the control method and the structure for the confined water in the existing basement storey-adding construction, the control of the starting or closing of the pressure reduction well is combined with the construction of the bored pile, so that the falling depth of the confined water is effectively reduced, and the influence of the confined water pumping on the surrounding environment is reduced.
The invention is not limited to the specific embodiments described above, but any variations and modifications made by a person skilled in the art in light of the above are intended to fall within the scope of the claims.
Claims (10)
1. A control method of pressure-bearing water in the layer-adding construction of the existing basement is characterized in that,
constructing a depressurization well in the storey-adding enclosure structure, and constructing an observation well at the periphery of the storey-adding enclosure structure, wherein the construction depth of the depressurization well is the same as that of the observation well;
the method comprises the steps of downwards constructing engineering piles from an existing B0 layer floor slab to an existing BM layer floor slab of an existing basement, wherein the depth of the engineering piles is larger than the design depth of the basement storey addition, and the depth of a pressure reduction well is larger than the depth of the engineering piles;
dismantling an existing B0 layer floor slab of the existing basement to an existing BM-1 layer floor slab, and constructing a bored pile downwards along the existing BM layer floor slab of the existing basement, wherein the depth of the depressurization well is smaller than that of the bored pile;
removing an existing BM layer floor slab of an existing basement, excavating soil to a preset depth to form a foundation pit, arranging foundation pit supports on the periphery of the foundation pit, and constructing a BN layer floor slab at the bottom of the foundation pit, wherein M, N is an integer greater than 0, and N is greater than M;
sequentially removing foundation pit supports upwards, constructing BN-1 floor slabs to BM+1 floor slabs on the BN floor slabs by adopting a forward method, and reconstructing BM floor slabs to B0 floor slabs on the BM+1 floor slabs, wherein N-M is the number of newly added basement layers;
when the engineering pile and/or the bored pile are constructed, the pressure-reducing well is started or closed according to the water level height change in the observation well, and the water level height of the pressure-bearing water in the basement layer-adding construction is controlled to be reduced so as not to influence the construction of the engineering pile and/or the bored pile and prevent the pressure-bearing water from overflowing from the pile hole;
before soil body excavation, the pressure reduction well is started or closed according to the water level height change in the observation well, and the water level height of the pressure-bearing water in basement layer-increasing construction is controlled to be reduced below an excavation surface.
2. The method for controlling pressurized water in the construction of the existing basement storey addition according to claim 1, wherein after the construction of the BN storey building, the relief well is removed, and the well below the BN storey building after the relief well is removed is plugged.
3. The method for controlling pressurized water in the construction of the existing basement according to claim 1, wherein the recharging well is constructed at the periphery of the building envelope while the pressure-reducing well and the observation well are constructed, and the recharging is performed according to the water level in the recharging well during the construction of the engineering pile, the bored pile and/or the soil excavation.
4. The control method of the pressurized water in the existing basement storey-adding construction of claim 1, wherein the step-up of the step-down well is performed by pumping the step-down well by pumping equipment; closing the depressurization well means that the pumping equipment stops pumping water to the depressurization well.
5. The control method of the pressurized water in the existing basement storey-adding construction of claim 1, wherein the depressurization well comprises a well formed by drilling, a mouth guard pipe, a well wall pipe, a water filtering pipe and a sedimentation pipe which are sequentially connected in the well, and an iron plate for sealing the bottom opening of the sedimentation pipe, wherein the mouth guard pipe is higher than the ground level of the well.
6. The method for controlling pressurized water in the construction of a bedding foundation of claim 1, wherein when the bored pile is constructed, the pressure-reducing well is closed after the pressurized water is resisted by the slurry with a large specific gravity, wherein the slurry specific gravity of the slurry with a large specific gravity is 12kN/m 3 The above.
7. The control method of the pressurized water in the existing basement storey-adding construction of claim 1, wherein after the pressure-reducing well is closed, the pressurized water is discharged by adopting a mode of opening holes to release pressure outwards.
8. The method for controlling pressurized water in the construction of an existing basement as set forth in claim 1, wherein in the construction of an existing basement as well as the construction of a construction pile, a trestle is constructed on an increased building envelope before the construction of an existing B0 floor of an existing basement is removed after the construction of the construction pile, said trestle being connected to the construction pile.
9. The utility model provides a control structure of confined water in existing basement layer-increasing construction, its characterized in that includes the layer-increasing building envelope that sets up in the periphery of existing building envelope of existing basement, is located the relief well in layer-increasing building envelope, is located the observation well of layer-increasing building envelope periphery, the degree of depth of relief well is the same with the degree of depth of observation well, passes the engineering pile that existing B0 floor of existing basement was under construction to existing BM layer floor, the degree of depth of relief well is greater than the degree of depth of engineering pile, along the drilling bored concrete pile of existing BM layer floor of existing basement under construction, the degree of depth of relief well is less than the depth of drilling bored concrete pile.
10. The control structure of pressure-bearing water in the construction of the existing basement storey addition according to claim 9, wherein the pressure-reducing well and the observation well comprise a well formed by drilling, a mouth protecting pipe, a well wall pipe, a water filtering pipe and a sedimentation pipe which are sequentially connected in the well, and an iron plate for sealing the bottom opening of the sedimentation pipe, wherein the mouth protecting pipe is higher than the ground level of the well.
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