CN110565978A - 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
- Publication number
- CN110565978A CN110565978A CN201910855339.2A CN201910855339A CN110565978A CN 110565978 A CN110565978 A CN 110565978A CN 201910855339 A CN201910855339 A CN 201910855339A CN 110565978 A CN110565978 A CN 110565978A
- Authority
- CN
- China
- Prior art keywords
- well
- existing
- storey
- floor
- construction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a control method and a structure of confined water in the storey-adding construction of an existing basement, wherein the method comprises the steps of constructing a depressurization well, an observation well, a construction engineering pile and a drilling cast-in-place pile inside and outside a storey-adding enclosure structure respectively; dismantling the existing BM layer floor, excavating soil to a preset depth to form a foundation pit, and constructing a BN layer floor at the bottom of the foundation pit, wherein M, N is an integer larger than 0, and N is larger than M; and constructing BN-1 floor to BM +1 floor on the BN floor, and rebuilding the BM floor to B0 floor. Before construction of an engineering pile, a bored pile and/or soil excavation, a pressure reduction well is determined to be started or closed according to the height change of the water level in an observation well, and the height of the water level of pressure-bearing water in the existing basement storey building construction is controlled to be reduced so as not to influence the construction of the engineering pile, the bored pile and/or the soil excavation. The invention reduces the difficulty of basement storey-adding construction and improves the construction safety by controlling the confined water.
Description
Technical Field
The invention relates to the technical field of building engineering, in particular to a method for controlling confined water in storey-adding construction of an existing basement and the existing basement with the structure.
Background
in the technical field of construction engineering, along with the development of urban modernization, the contradictions and problems of urban land resource and space development are increasingly prominent, and the utilization of underground space is continuously three-dimensional. The problems of congestion of underground spaces, such as parking difficulty in traffic hub stations, large-scale venues, commercial buildings and residential districts, are increasingly prominent, and the sustainable development of cities is seriously influenced. Therefore, the reasonable development and utilization of the space below the basement of the existing building in the city is one of the effective ways for solving the contradiction between the land resources and the space development of the city at present. However, in the soil environment involving confined water in the existing basement storey-adding construction, when the confined water is drilled, the water gushing upwards influences the safety and difficulty of the existing basement storey-adding construction, wherein the confined water is underground water in a water-bearing layer between two water-resisting layers. Therefore, how to control the confined water to reduce the construction difficulty and safely construct in the basement storey-adding construction becomes a technical problem which needs to be solved in the field urgently.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a structure for controlling confined water in storey-adding construction of an existing basement room, so as to solve the problem of confined water in the storey-adding construction of the existing basement.
In order to solve the technical problems, the invention provides a method for controlling confined water in the storey-adding construction of the existing basement,
Constructing a pressure reducing well in the storey-adding building enclosure, and constructing an observation well at the periphery of the storey-adding building enclosure, wherein the construction depth of the pressure reducing well is the same as that of the observation well;
Constructing engineering piles downwards from the existing B0 floor slab of the existing basement to the existing BM floor slab, wherein the depth of the engineering piles is greater than the design depth of the added floor of the basement, and the depth of the pressure reducing well is greater than the depth of the engineering piles;
Removing the existing B0 floor of the existing basement to the existing BM-1 floor, and constructing a bored pile downwards along the existing BM floor of the existing basement, wherein the depth of the depressurization well is less than that of the bored pile;
Dismantling the existing BM floor of the existing basement, excavating soil to a preset depth to form a foundation pit, arranging a foundation pit support at the periphery of the foundation pit, and constructing a BN floor at the bottom of the foundation pit, wherein M, N is an integer larger than 0, and N is larger than M;
sequentially removing foundation pit supports upwards, constructing BN-1 floor to BM +1 floor on the BN floor by adopting a sequential construction method, and rebuilding the BM +1 floor to B0 floor on the BM +1 floor, wherein N-M is the number of newly added basement layers;
When an engineering pile and/or a cast-in-situ bored pile is constructed, the pressure reduction well is determined to be started or closed according to the height change of the water level in the observation well, and the height of the water level of the bearing water in the basement storey building construction is controlled to be reduced, so that the construction of the engineering pile and/or the cast-in-situ bored pile is not influenced, and the bearing water is prevented from overflowing from a pile hole;
Before soil body excavation, the depressurization well is determined to be started or closed according to the height change of the water level in the observation well, and the water level height of the confined water in the basement storey building construction is controlled to be reduced to be below the excavation surface.
Furthermore, according to the control method of the confined water in the existing basement storey-adding construction, after the BN storey floor is constructed, the depressurization well is dismantled, and the well below the BN storey floor after the depressurization well is dismantled is plugged.
Furthermore, the control method of the confined water in the existing basement storey-adding construction provided by the invention is used for constructing the recharge well at the periphery of the storey-adding enclosure structure while constructing the depressurization well and the observation well, and recharging water according to the water level height in the recharge well in the construction engineering pile, the cast-in-situ bored pile and/or the soil body excavation process.
Furthermore, the control method of the confined water in the existing basement storey-adding construction provided by the invention starts the depressurization well, and means that water pumping equipment is adopted to pump water to the depressurization well; and closing the depressurization well means that the water pumping equipment stops pumping water to the depressurization well.
Further, the pressure-bearing water control method in the existing basement storey-adding construction provided by the invention comprises the step-down well, a mouth protecting pipe, a well wall pipe, a water filtering pipe and a settling pipe which are sequentially connected in the step-down well, and an iron plate for sealing the bottom mouth of the settling pipe, wherein the mouth protecting pipe is higher than the ground level of the step-down well.
Furthermore, the control method of the confined water in the existing basement storey-adding construction provided by the invention has the advantages that when the cast-in-situ bored pile is constructed, the large-specific-gravity slurry is utilized to resist the confined water and then the pressure reduction well is closed, wherein the slurry specific gravity of the large-specific-gravity slurry is 12kN/m3The above.
Furthermore, according to the control method of the confined water in the existing basement storey-adding construction, after the depressurization well is closed, the hole is opened to release the pressure outwards to discharge the confined water.
Further, according to the control method of the confined water in the existing basement storey-adding construction, after construction of the engineering piles, before the existing B0 storey board of the existing basement is dismantled, a trestle is constructed on the storey-adding enclosure structure, and the trestle is connected with the engineering piles.
the invention also provides a control structure for bearing water in the storey-adding construction of the existing basement, which comprises a storey-adding enclosure structure arranged on the periphery of the existing enclosure structure of the existing basement, a depressurization well positioned in the storey-adding enclosure structure and an observation well positioned on the periphery of the storey-adding enclosure structure, wherein the depth of the depressurization well is the same as that of the observation well, the depth of the depressurization well is greater than that of the engineering pile, and the depth of the depressurization well is less than that of the bored pile.
Furthermore, the control structure for confined water in the existing basement storey-adding construction provided by the invention comprises a shaft 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 shaft, 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 shaft.
Compared with the prior art, the method and the structure for controlling the confined water in the existing basement storey-adding construction can control the height change of the water level of the confined water according to the starting or closing of the depressurization well when facing the soil body environment of the underground water layer such as the confined water and the like in the existing basement storey-adding construction, and control the confined water in the pipeline of the depressurization well without overflowing into the existing basement and the foundation pit, so that the storey-adding construction of the existing basement is not influenced. In the construction engineering pile and/or the cast-in-situ bored pile, the depressurization well is determined to be started or closed according to the height change of the water level in the observation well, and the water level of the bearing water in the basement storey-adding construction is controlled to be reduced, so that the construction of the engineering pile and/or the cast-in-situ bored pile is not influenced, and the bearing water is prevented from overflowing from the pile hole to influence the basement storey-adding construction. Before soil excavation, the depressurization well is determined to be started or closed according to the height change of the water level in the observation well, and the water level height of the confined water in the basement storey-adding construction is controlled to be reduced to be below an excavation surface, so that the difficulty and progress of soil excavation in the basement storey-adding construction are not influenced by the confined water. The control method and the structure of the confined water in the existing basement storey-adding construction provided by the invention reduce the difficulty of the existing basement storey-adding construction and improve the construction safety.
Drawings
Fig. 1 to 7 are schematic process diagrams of an existing basement storey-adding method and a method for controlling confined water in storey-adding construction according to an embodiment of the invention;
Fig. 8 is a flowchart of an existing basement storey addition method according to an embodiment of the invention;
fig. 9 is a flowchart of a method for controlling confined water in existing basement storey-adding construction according to an embodiment of the present invention.
shown in the figure: 111. the system comprises an existing underground continuous wall, 112, existing water stop piles, 113, existing support replacing beams, 114, existing support replacing plates, 121, existing B0 floors, 122, existing BM-1 floors, 123, existing BM floor, 124, existing outer walls, 125, existing vertical supporting columns, 201, a layer-adding underground enclosure wall, 202, a layer-adding water stop pile, 203, ring beams 203, 204, holes, 205, upright column piles, 206, bored concrete piles, 207, BN floor, 208, BN-1 floors, 209, BM floor, 210, BM-1 floors, 211, B0 floors, 300, pile machines, 401, trestles, 402, temporary supports, 501, pressure reduction wells, 502, observation wells, 503, recharge wells, 504 and shafts.
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 present invention will be described in detail by taking a two-layer existing basement with M being 2 as an example. The existing basement comprises an existing enclosing structure, a first basement layer and a second basement layer. The existing enclosure structure comprises an existing underground continuous wall 112, a waterproof curtain formed by existing waterproof piles 111 and located on the periphery of the existing underground continuous wall 112, and an existing support replacing beam 113 and an existing support replacing plate 114 located on the inner side of the waterproof curtain. The existing basement also includes existing top floors 121, existing middle floors 122, and existing bottom floors 123, existing exterior walls 124 located inside the existing bracing beams 113, and existing vertical support columns 125 disposed between each floor. Wherein the existing top floor 121, the existing middle floor 122 and the existing outer wall 124 form a first floor of the basement. The existing middle floor 122, the existing bottom floor 123 and the existing outer wall 124 form a second floor of the basement.
Example one
Referring to fig. 8, an embodiment of the present invention provides a floor adding method for an existing basement, where the number of floors of the existing basement is set to M-3, and the number of newly added floors is set to L-2, including:
Step 601, please refer to fig. 1, a story-adding envelope is constructed on the periphery of the existing envelope of the existing basement on the M floors, wherein M is an integer greater than 0. The storey-adding enclosure structure comprises an underground enclosure wall 201 and a waterproof curtain formed by waterproof piles 202 located on the periphery of the underground enclosure wall 201, and a ring beam 203 is arranged at the top end of the underground enclosure wall 201, and the ring beam 203 is connected with the waterproof piles 202 in a contact mode. The ring beam 203 can improve the structural stability of the underground enclosure wall 201.
in step 602, referring to fig. 2, the engineering pile 205 is constructed downwards through the existing B0 floor 121 of the existing basement to the existing BM floor 123. The engineering piles 205 include lattice columns located above the existing basement and upright piles connected to the lattice columns, which are located below the existing basement. Referring to fig. 1 to 2, before the construction of the construction pile 205, a step of forming an opening 204 in the floors 121 to 123 of the existing B0 floors is included, and the construction pile 205 is inserted through the opening 204.
step 603, please refer to fig. 3, removing the existing B0 floor 121 of the existing basement to the existing BM-1 floor 122, drilling the existing BM floor 123 of the existing basement, and constructing the cast-in-situ bored pile 206 downward. In this step 603, the bored pile 206 is post-grouted to improve its bearing capacity, and seal the pile body gap, check the sealing performance of all the bored piles 206, and prevent leakage of the bearing water along the pile hole of the bored pile 206.
Step 604, please refer to fig. 4 to 5, removing the existing BM floor 123 of the existing basement, excavating the soil body to a predetermined depth to form a foundation pit, and setting a foundation pit support 402 at the periphery of the foundation pit, and constructing a 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 and collapsing of the wall body in the construction process of the foundation pit. The foundation pit supports 402 can be arranged in an increasing or decreasing manner according to the number of construction layers of the basement. The foundation pit supports 402 are multiple tracks, and the distance between every two adjacent tracks of foundation pit supports 402 can be 2-3 meters.
step 605, please refer to fig. 6 to 7, sequentially removing the foundation pit supports 402 upwards, constructing BN-1 floors 208 to BM +1 floors on the BN floor 207, and rebuilding BM +1 floors 209 to B0 floors 211 on the BM +1 floors by using a sequential method, where N-M is the number L of newly added basement floors. In the embodiment of the invention, the number of floor layers of the existing basement is set to be M-3, and the number of newly added floor layers is set to be L-2. Therefore, in step 506, BN-1 floor 208 is equal to BM +1 floor. The embodiment of the invention is not limited to adding two floors or only adding floors to the existing basement with 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 enclosure constructed to cover the periphery of an existing enclosure of an existing basement, floors 211 of reconstructed BM layers 209 to B0 and floors 208 of constructed BM +1 layers to 207 of constructed BN layers, and cast-in-situ bored piles 206 and engineering piles 205 arranged downward along the floor 207 of the constructed BN layer.
The existing basement floor adding method and structure provided by the embodiment of the invention form a four-layer basement structure, wherein the reconstructed BM layer floor 209 to B0 layer floor 211 are dismantled to form a two-layer basement structure which is the number of the existing basement layers, and the BM layer floor 209 to BN layer floor 207 form a newly added two-layer basement structure. That is to say, the embodiment of the invention expands the existing two-layer basement structure and adds the two-layer basement, thereby carrying out secondary development and utilization on the underground space of the existing building and carrying out reasonable and effective development on the existing urban land resources. The added-layer building envelope protects the structural stability of the existing building and the underground space of the existing building, and the engineering piles 205 are constructed from the floor slab 121 of the existing B0 layer to the floor slab 123 of the existing BM layer, so that the structural stability of the existing building can be further protected and the collapse can be prevented during the added-layer construction of the underground space. The bored pile 206 is constructed to form a vertical supporting system of an underground space, so as to ensure the safety and stability of the existing building. The excavation of the soil body to the predetermined depth is to form a depth for increasing the underground space, so as to be used for newly building an increased number of floors of a floor, so as to expand, develop and utilize the existing basement, construct by a sequential method, and arrange the foundation pit support 402, thereby further protecting the stability and the safety of the construction of the expanded underground space. The storey-adding building structure of the existing basement realizes the storey-adding purpose of the existing basement by covering the storey-adding envelope structure of the existing basement, and removing the reconstructed floor slabs 209 to B0 of the BM storey and the floor slabs 211 of the B0 of the BM storey and the floor slabs 208 to 207 of the BN storey of the BM +1 storey. The expanded underground space and the existing buildings are supported through the cast-in-situ bored piles 206, so that the underground space and the existing buildings are protected, and the construction safety is ensured. The existing basement storey-adding structure has the effects of simple structure and high safety.
Referring to fig. 2, a method for adding floors to an existing basement according to an embodiment of the present invention includes, after constructing the engineering piles 205, removing the existing B0 floor slab 121 of the existing basement, and constructing trestles 401 between the underground enclosure walls 201, where the trestles 401 connect the engineering piles 205. The trestle 401 is used as a passage for construction on one hand and as a first foundation pit support in the foundation pit support 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 off of the trestle are prevented. The trestle 401 can ensure horizontal bearing capacity.
Referring to fig. 3, in the method for adding floors to an existing basement according to the first embodiment of the present invention, a water drilling machine 300 is used to drill holes in an existing BM floor 123 of an existing basement.
Referring to fig. 4 to 7, a method for adding a floor to an existing basement according to an embodiment of the present invention further includes removing an existing enclosure of the existing basement when excavating a soil body to a predetermined depth. And the existing envelope structure is removed, so that the structural stability of the newly formed underground space can be ensured on one hand, and the area of the underground space can be increased on the other hand.
in order to ensure the construction safety, in the floor-adding method of the existing basement provided in the embodiment of the present invention, after the existing B0 floor 121 of the existing basement is removed to the existing BM-1 floor 122, the horizontal support is 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 storey addition, in the storey addition method of the existing basement provided by the embodiment of the invention, vertical support columns are arranged between adjacent floor slabs between the reconstructed floor slab 211 of the B0 storey and the BM floor slab 209 and between the constructed floor slab 208 of the BM +1 storey and the floor slab 207 of the BN storey.
Example two
Referring to fig. 9, a method for controlling confined water in existing basement storey building according to a second embodiment of the present invention includes:
Step 701, referring to fig. 1, constructing a pressure reducing well 501 in the story-adding building enclosure, constructing an observation well 502 on the periphery of the story-adding building enclosure, wherein the construction depth of the pressure reducing well 501 is the same as that of the observation well 502;
step 702, referring to fig. 2, a project pile 205 is constructed downwards from an existing B0 floor 121 to an existing BM floor 123 of an existing basement, the depth of the project pile 205 is greater than the design depth of a basement storey-adding layer, and the depth of the pressure reducing well 501 is greater than the depth of the project pile 205;
step 703, please refer to fig. 3, removing the existing B0 floor 121 of the existing basement to the existing BM-1 floor 122, and constructing a bored pile 206 downwards along the existing BM floor 123 of the existing basement, wherein the depth of the pressure reduction well 510 is smaller than that of the bored pile 206;
step 704, please refer to fig. 4 to 5, removing the existing BM floor 123 of the existing basement, excavating the soil body to a predetermined depth to form a foundation pit, and setting a foundation pit support at the periphery of the foundation pit, and constructing a BN floor 207 at the bottom of the foundation pit, where M, N is an integer greater than 0 and N > M;
step 705, please refer to fig. 6 to 7, sequentially removing the foundation pit supports upwards, constructing BN-1 floors 208 to BM +1 floors on the BN floors by a sequential method, and rebuilding BM +1 floors with BM floors 209 to B0 floors 211, where N-M is the number of newly added basements.
Step 706, when the engineering pile 205 and/or the cast-in-situ bored pile 206 are/is constructed, the depressurization well 501 is determined to be started or closed according to the height change of the water level in the observation well 502, and the height of the water level of the pressure-bearing water in the basement storey building construction is controlled to be reduced, so that the construction of the engineering pile 205 and/or the cast-in-situ bored pile 206 is not influenced, and the pressure-bearing water is prevented from overflowing from the pile hole;
And 707, before soil excavation, determining to start or close the depressurization well 501 according to the height change of the water level in the observation well 502, and controlling the height of the water level of the confined water to be reduced below an excavation surface in the basement storey building construction.
The method for controlling confined water in the existing basement storey-adding construction provided by the second embodiment of the invention comprises but is not limited to the storey-adding method and the structure of the existing basement in the first embodiment.
According to the control method for the confined water in the existing basement storey-adding construction, provided by the embodiment of the invention, after the BN-layer floor slab 207 is constructed, the depressurization well 501 is removed, and the well 504 below the BN-layer floor slab 207 after the depressurization well 501 is removed is plugged. After the shaft 504 is blocked, the basement structure after the basement is added with floors 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 pressure reducing well 501 and the observation well 502 are constructed, the recharging well 503 is constructed on the periphery of the storey-adding enclosure structure, and the recharging water is conducted according to the water level height in the recharging well 503 in the construction engineering pile 205, the cast-in-situ bored pile 206 and/or the soil body excavation process. Wherein the construction depth of the recharge well 503 is the same as the construction depth of the observation well 502. The groundwater level around the foundation pit can be ensured to be stable by carrying out the recharge water to the recharge well 503.
According to the control method for the confined water in the existing basement storey-adding construction, provided by the embodiment of the invention, before the construction engineering pile or the cast-in-situ bored pile, the pressure reduction well 501 is determined to be started or closed according to the height change of the water level in the observation well 502. Since the depth of observation well 502 is the same as the depth of depressurization well 501, the water level change in observation well 502 can reflect the water level change in depressurization well 501.
in order to improve the stability of the basement structure after storey addition, please refer to fig. 2 to 5, in the method for controlling confined water in the existing basement storey addition construction according to the second embodiment of the present invention, the construction depth of the pressure reduction well 501 is greater than the construction depth of the engineering pile 205, and the construction depth of the pressure reduction well 501 is less than the construction depth of the cast-in-situ bored pile 206. The construction depth of the pressure reduction well 501 is larger 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 pressure bearing water on the construction of the engineering pile 205 and drilling can be overcome.
In the control method of the confined water in the existing basement storey-adding construction provided by the embodiment of the invention, the pressure reducing well 501 is started, namely, water pumping equipment is adopted to pump water to the pressure reducing well 501 so as to reduce the height of the water level of the confined water; closing the depressurization well 501 means that the water pumping equipment stops pumping water to the depressurization well 501.
according to the control method for confined water in the existing basement storey-adding construction, the depressurization well 501 comprises a well 504 formed by drilling, a mouth protecting pipe, a well wall pipe, a water filtering pipe and a sedimentation pipe wrapping a nylon filter screen and an iron plate for sealing the bottom opening of the sedimentation pipe, wherein the mouth protecting pipe is located in the well 504 and is sequentially connected with the water filtering pipe and the sedimentation pipe, and the mouth protecting pipe is higher than the ground level of the well 504. The arrangement of the mouth guard pipe can prevent surface sewage from permeating into the depressurization well 501. The construction method of the pressure reducing well 501 comprises the steps of arranging the pressure reducing well 501, measuring and setting out to determine the position of the pressure reducing well, removing a floor slab of a BM layer of the basement at the corresponding position by using a water drilling machine, installing a drilling machine after a mouth protecting pipe is buried, and drilling to form a hole; and after cleaning the holes, putting down a well wall pipe, a water filter pipe wrapped by a nylon filter screen and a settling pipe, cleaning the holes for the second time to form a well, filling filter materials in the well, sealing the well with clay, washing the pressure reduction well, and installing water pumps and other water pumping equipment to pump water in a test mode. The well head of the depressurization well 501 is about 0.5m higher than the ground level. The casing pipe is made of welded steel pipe. Wherein the diameters of the well wall pipe, the strainer pipe wrapping the nylon filter screen and the settling pipe are the same.
according to the control method of the confined water in the existing basement storey-adding construction, when the cast-in-situ bored pile is constructed, the pressure reducing well 501 is closed after the large-specific-gravity mud resists the confined water, wherein the mud specific gravity of the large-specific-gravity mud is 12kN/m3The above. The large-specific-gravity slurry can prevent the pressure-bearing water from overflowing into the cast-in-situ bored pile, and the structural stability of the cast-in-situ bored pile is improved. Closing the depressurization well 501 has the effects of energy conservation and emission reduction. After the depressurization well 501 is closed, the pressure-bearing water is discharged by pressure relief outwards in a hole forming mode.
Referring to fig. 1 to 7, a second embodiment of the present invention provides a control structure for confined water in floor-adding construction of an existing basement, including a floor-adding enclosure arranged on the periphery of an existing enclosure of the existing basement, a depressurization well 501 located inside the floor-adding enclosure, and an observation well 502 located on the periphery of the floor-adding enclosure, where the depth of the depressurization well 501 is the same as that of the observation well 502, the depth of the depressurization well 501 is greater than that of the engineering pile, and the depth of the depressurization well 501 is less than that of a bored pile. The pressure reduction wells 501 are distributed in a staggered manner with respect to the engineering piles 205 and the cast-in-situ bored piles 206.
In the control structure for confined water in the existing basement storey-adding construction provided by the embodiment of the invention, each of the depressurization well 501 and the observation well 502 comprises a well 504 formed by drilling, a mouth protecting pipe, a well wall pipe, a water filtering pipe and a sedimentation pipe wrapping a nylon filter screen and sequentially connected in the well 504, 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 504. The mouth guard of the depressurization well 501 is above the ground level of the hoistway 504 to prevent surface wastewater from seeping into the depressurization well 501.
The method and the structure for controlling confined water in the existing basement storey-adding construction provided by the embodiment of the invention can control the height change of the water level of the confined water according to the starting or closing of the depressurization well 501 when facing the soil environment of the underground water layer such as the confined water and the like in the existing basement storey-adding construction, and control the confined water in the pipeline of the depressurization well 501 without overflowing into the existing basement and the foundation pit, thereby not influencing the storey-adding construction of the existing basement. In the construction engineering pile 205 and/or the cast-in-situ bored pile 206, the depressurization well 501 is determined to be started or closed according to the height change of the water level in the observation well 502, and the height of the water level of the pressure-bearing water in the basement storey-adding construction is controlled to be reduced, so that the construction of the engineering pile 205 and/or the cast-in-situ bored pile 206 is not influenced, and the pressure-bearing water is prevented from overflowing from the pile hole to influence the basement storey-adding construction. Before soil excavation, the depressurization well 501 is determined to be started or closed according to the height change of the water level in the observation well 502, and the water level of the pressure-bearing water in the basement storey-adding construction is controlled to be lowered to be below an excavation surface, so that the pressure-bearing water does not influence the difficulty and progress of soil excavation in the basement storey-adding construction.
According to the control method and the structure of the confined water in the existing basement storey-adding construction, the pressure reduction well is controlled to be started or closed, the construction of the bored pile is combined, the pressure reduction of the confined water is effectively reduced, and the influence of pumping of the confined water on the surrounding environment is reduced.
The present invention is not limited to the above-described embodiments, and any variations and modifications thereof by those skilled in the art are intended to fall within the scope of the appended claims.
Claims (10)
1. a method for controlling confined water in the storey-adding construction of the existing basement is characterized in that,
Constructing a pressure reducing well in the storey-adding building enclosure, and constructing an observation well at the periphery of the storey-adding building enclosure, wherein the construction depth of the pressure reducing well is the same as that of the observation well;
constructing engineering piles downwards from the existing B0 floor slab of the existing basement to the existing BM floor slab, wherein the depth of the engineering piles is greater than the design depth of the added floor of the basement, and the depth of the pressure reducing well is greater than the depth of the engineering piles;
Removing the existing B0 floor of the existing basement to the existing BM-1 floor, and constructing a bored pile downwards along the existing BM floor of the existing basement, wherein the depth of the depressurization well is less than that of the bored pile;
Dismantling the existing BM floor of the existing basement, excavating soil to a preset depth to form a foundation pit, arranging a foundation pit support at the periphery of the foundation pit, and constructing a BN floor at the bottom of the foundation pit, wherein M, N is an integer larger than 0, and N is larger than M;
Sequentially removing foundation pit supports upwards, constructing BN-1 floor to BM +1 floor on the BN floor by adopting a sequential construction method, and rebuilding the BM +1 floor to B0 floor on the BM +1 floor, wherein N-M is the number of newly added basement layers;
When an engineering pile and/or a cast-in-situ bored pile is constructed, the pressure reduction well is determined to be started or closed according to the height change of the water level in the observation well, and the height of the water level of the bearing water in the basement storey building construction is controlled to be reduced, so that the construction of the engineering pile and/or the cast-in-situ bored pile is not influenced, and the bearing water is prevented from overflowing from a pile hole;
before soil body excavation, the depressurization well is determined to be started or closed according to the height change of the water level in the observation well, and the water level height of the confined water in the basement storey building construction is controlled to be reduced to be below the excavation surface.
2. The method for controlling confined water in the storey-adding construction of the existing basement according to claim 1, wherein after the BN-layer floor is constructed, the depressurization well is removed, and the well below the BN-layer floor after the depressurization well is removed is plugged.
3. the method for controlling confined water in the existing basement storey-adding construction according to claim 1, wherein while constructing the depressurization well and the observation well, a recharge well is constructed at the periphery of the storey-adding enclosure structure, and the recharge water is conducted according to the water level height in the recharge well in the construction engineering pile, the cast-in-situ bored pile and/or the soil excavation process.
4. The method for controlling confined water in the existing basement storey-adding construction according to claim 1, wherein the step-down well is started, namely water pumping equipment is adopted to pump water to the step-down well; and closing the depressurization well means that the water pumping equipment stops pumping water to the depressurization well.
5. The method for controlling confined water in the existing basement storey-adding construction according to claim 1, wherein the depressurization well comprises a well formed by drilling, a mouth protection pipe, a well wall pipe, a strainer pipe and a sedimentation pipe wrapping a nylon filter screen and an iron plate closing a bottom opening of the sedimentation pipe, which are sequentially connected in the well, and the mouth protection pipe is higher than the ground level of the well.
6. the method for controlling confined water in the existing basement storey-adding construction according to claim 1, wherein when the bored pile is constructed, the pressure reduction well is closed after the large-specific gravity mud is used for resisting the confined water, wherein the mud specific gravity of the large-specific gravity mud is 12kN/m3The above.
7. The method for controlling confined water in the existing basement storey-adding construction according to claim 1, wherein after the depressurization well is closed, the hole is opened to release pressure outwards to discharge the confined water.
8. The method for controlling confined water in the storey-adding construction of the existing basement according to claim 1, wherein in the storey-adding construction of the existing basement, a trestle is constructed on the storey-adding enclosure structure after construction of the engineering pile and before dismantling the floor slab of the existing B0 storey of the existing basement, and the trestle is connected with the engineering pile.
9. The control structure is characterized by comprising a storey-adding enclosure structure arranged on the periphery of an existing enclosure structure of an existing basement, a depressurization well positioned in the storey-adding enclosure structure and an observation well positioned on the periphery of the storey-adding enclosure structure, wherein the depth of the depressurization well is the same as that of the observation well, the depth of the depressurization well is greater than that of an engineering pile, and the depth of the depressurization well is less than that of a bored pile.
10. the structure as claimed in claim 9, wherein the pressure-reducing well and the observation well each comprise a well formed by drilling, a mouth-protecting pipe, a well wall pipe, a strainer pipe and a settling pipe wrapping a nylon filter screen, and an iron plate closing a bottom opening of the settling pipe, which are sequentially connected in the well, and the mouth-protecting pipe is higher than the ground level of the well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910855339.2A CN110565978B (en) | 2019-09-11 | 2019-09-11 | Control method and structure of confined water in existing basement storey-adding construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910855339.2A CN110565978B (en) | 2019-09-11 | 2019-09-11 | Control method and structure of confined water in existing basement storey-adding construction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110565978A true CN110565978A (en) | 2019-12-13 |
| CN110565978B CN110565978B (en) | 2023-08-15 |
Family
ID=68779178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910855339.2A Active CN110565978B (en) | 2019-09-11 | 2019-09-11 | Control method and structure of confined water in existing basement storey-adding construction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110565978B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112359819A (en) * | 2020-11-09 | 2021-02-12 | 东南大学 | Wall structure construction method for increasing depth of old diaphragm wall |
| CN112593566A (en) * | 2020-11-24 | 2021-04-02 | 浙江二十冶建设有限公司 | Dewatering method for existing building deep foundation pit |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139838A (en) * | 2007-10-15 | 2008-03-12 | 上海市隧道工程轨道交通设计研究院 | Construction method for high artesian area ultra-deep foundation pit |
| CN101886479A (en) * | 2010-07-14 | 2010-11-17 | 山东建筑大学 | Underground storey-adding process of frame structural building by one-by-one independent foundation underpinning method |
| CN102182325A (en) * | 2011-03-28 | 2011-09-14 | 东南大学 | Storey adding method for existing building basement with frame structure and independent foundation |
| CN103437567A (en) * | 2013-08-30 | 2013-12-11 | 山东建筑大学 | Method for supporting existing building underground added storey through original pile foundations |
| CN103790150A (en) * | 2014-01-20 | 2014-05-14 | 天津大学 | Settlement control method based on twin-well combined type recharge |
| CN105369812A (en) * | 2015-10-13 | 2016-03-02 | 上海交通大学 | Pressure bearing water level determining method for constant-flow water pumping of lower foundation pit of suspension type waterproof curtain |
| CN106337426A (en) * | 2016-09-22 | 2017-01-18 | 苏州市轨道交通集团有限公司 | Dewatering method used for improving surging-resisting stability of confined water stratum foundation pit |
| CN211257900U (en) * | 2019-09-11 | 2020-08-14 | 上海建工一建集团有限公司 | Control structure of confined water in existing basement storey-adding construction |
-
2019
- 2019-09-11 CN CN201910855339.2A patent/CN110565978B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139838A (en) * | 2007-10-15 | 2008-03-12 | 上海市隧道工程轨道交通设计研究院 | Construction method for high artesian area ultra-deep foundation pit |
| CN101886479A (en) * | 2010-07-14 | 2010-11-17 | 山东建筑大学 | Underground storey-adding process of frame structural building by one-by-one independent foundation underpinning method |
| CN102182325A (en) * | 2011-03-28 | 2011-09-14 | 东南大学 | Storey adding method for existing building basement with frame structure and independent foundation |
| CN103437567A (en) * | 2013-08-30 | 2013-12-11 | 山东建筑大学 | Method for supporting existing building underground added storey through original pile foundations |
| CN103790150A (en) * | 2014-01-20 | 2014-05-14 | 天津大学 | Settlement control method based on twin-well combined type recharge |
| CN105369812A (en) * | 2015-10-13 | 2016-03-02 | 上海交通大学 | Pressure bearing water level determining method for constant-flow water pumping of lower foundation pit of suspension type waterproof curtain |
| CN106337426A (en) * | 2016-09-22 | 2017-01-18 | 苏州市轨道交通集团有限公司 | Dewatering method used for improving surging-resisting stability of confined water stratum foundation pit |
| CN211257900U (en) * | 2019-09-11 | 2020-08-14 | 上海建工一建集团有限公司 | Control structure of confined water in existing basement storey-adding construction |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112359819A (en) * | 2020-11-09 | 2021-02-12 | 东南大学 | Wall structure construction method for increasing depth of old diaphragm wall |
| CN112593566A (en) * | 2020-11-24 | 2021-04-02 | 浙江二十冶建设有限公司 | Dewatering method for existing building deep foundation pit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110565978B (en) | 2023-08-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113614315A (en) | Method of constructing a structure | |
| CN110374112B (en) | Deep foundation pit supporting system for weak soil field and construction method thereof | |
| CN101701461B (en) | Method for constructing energy-saving underground tube structure | |
| CN107326928B (en) | Construction method of deep underground garage partially relating to basement | |
| CN110878562B (en) | Method for in-situ excavation of foundation pit and new addition of underground structure under existing reserved building | |
| CN110565978B (en) | Control method and structure of confined water in existing basement storey-adding construction | |
| CN107489284B (en) | Construction method for local newly-added deep underground garage of basement | |
| CN110409420B (en) | Underground continuous wall with pit facing surface and precipitation function | |
| CN110424372A (en) | Along road interval method in a row remove obstacles after construct diaphram wall construction method | |
| CN211257915U (en) | Floor-adding structure of existing building underground space | |
| CN211257900U (en) | Control structure of confined water in existing basement storey-adding construction | |
| CN112878363B (en) | Construction method for post-pile-filling of existing basement structure | |
| CN110886507B (en) | Method for increasing storey and expanding under existing building | |
| CN111764396A (en) | Construction method for water-rich stratum pit-in-pit | |
| CN111827705A (en) | Method for expanding well barrel-shaped underground garage in existing underground garage | |
| CN113898007B (en) | Semi-inverse construction method for long-span corridor structure along street | |
| CN115573388A (en) | Construction structure and method for repairing water pipe of inverted well | |
| CN110565981A (en) | storey-adding method and structure for underground space of existing building | |
| AU2020100004A4 (en) | A Method Of Constructing A Column, A Subterranean Structure, And A Structure Made From The Method | |
| CN211036962U (en) | Underground continuous wall with pit-facing surface and dewatering function | |
| KR20010002387A (en) | An underground pressure release well system | |
| CN110409419B (en) | Construction method for exploration surrounding well by using underground continuous wall | |
| JP4064837B2 (en) | Housing construction method and housing | |
| CN220686115U (en) | Basin-type curtain structure with strong permeable layer in pit | |
| CN114382487B (en) | Non-excavation reverse disassembly method for ultra-deep vertical shaft |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |