CN110512649B - Underground excavation construction method for additionally arranging basement and communication channel structure under existing building - Google Patents
Underground excavation construction method for additionally arranging basement and communication channel structure under existing building Download PDFInfo
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- CN110512649B CN110512649B CN201910659216.1A CN201910659216A CN110512649B CN 110512649 B CN110512649 B CN 110512649B CN 201910659216 A CN201910659216 A CN 201910659216A CN 110512649 B CN110512649 B CN 110512649B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
- E02D29/05—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
- E02D29/055—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
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Abstract
The invention discloses a subsurface excavation construction method for additionally arranging a basement and a communicating channel structure under an existing building, relates to the field of reconstruction construction of underground structures of existing buildings, and aims to solve the problem that underground space which is excavated in situ of a foundation pit of the existing old building and communicated with an adjacent building is difficult to develop and reconstruct construction. The method comprises the following steps: the method comprises the steps of reinforcing the wall body and the original foundation of the existing building, limiting deformation and uneven settlement of the superstructure of the existing building during later excavation construction, constructing a vertical shaft which can be communicated with a jacking construction area in the existing building, constructing pipe jacking opening enclosure structures at two ends of the jacking construction area respectively, preventing water seepage of a pipe jacking working area during construction, opening holes in the vertical shaft of the existing building, the outer wall of the adjacent basement structure of the existing building, an underground continuous wall and the corresponding pipe jacking opening enclosure structures, implementing jacking construction by adopting a receiving-free well pipe jacking construction technology, and communicating the basement structures of the existing building and the adjacent existing building through a communication channel structure.
Description
Technical Field
The invention relates to the field of reconstruction construction of underground structures of existing buildings, in particular to a subsurface excavation construction method for additionally arranging basements and communication channel structures under existing buildings.
Background
With the acceleration of the urbanization process, old buildings are more frequently transformed in cities, so that the problems of protection of a plurality of historical buildings are faced, the requirements of development of underground spaces such as basements, communication channels and the like are also faced in limited spaces, and great difficulty is brought to engineering construction.
At present, existing building underground structure reconstruction projects are mostly concentrated on underground space development and utilization under single buildings, researches on in-situ foundation pit excavation of existing old buildings and communication between the existing old buildings and adjacent existing buildings are few, the requirement for additionally arranging underground communication channels under the old buildings in actual projects is urgent, the existing building underground structure reconstruction projects generally relate to the working procedures of foundation protection, foundation pit excavation, building envelope dismantling, channel connection and the like of the existing old buildings, meanwhile, the existing building underground structure reconstruction projects often face the problems of high requirement on surrounding environment protection of the foundation pits, narrow construction sites, many site obstacles, difficulty in earthwork transportation and the like, and therefore the existing building underground structure reconstruction projects have very high requirements on selection of construction methods and arrangement of construction processes.
In view of the above, in order to effectively solve the difficult problems of excavation of in-situ foundation pits of the existing old building and development and reconstruction of underground spaces communicated with the adjacent existing building, a subsurface excavation construction method for additionally arranging basements and communication passages under the existing building is urgently needed by the technical staff in the field.
Disclosure of Invention
Aiming at the problem of high difficulty in development and reconstruction construction of underground space which is excavated by an original foundation pit of an old building and communicated with an adjacent building, the invention aims to provide a subsurface excavation construction method for additionally arranging a basement and a communication channel structure under the existing building, which can safely and efficiently complete the addition of the basement structure of the existing building, complete the excavation and the communication of the communication channel structure, realize the connection between the existing building and the basement structure of the adjacent existing building and improve the resource utilization rate of the underground space of the existing building.
The technical scheme adopted by the invention for solving the technical problems is as follows: the underground excavation construction method for additionally arranging the basement and the communication passage structure under the existing building comprises the following steps:
s1: supporting and reinforcing the wall body and the original foundation of the existing building;
s2: excavating earthwork after building enclosure construction is carried out at the position of a vertical shaft preset at the bottom of the existing building, and constructing a basement structure of the existing building in the vertical shaft by adopting a sequential construction method;
s3: clearing obstacles in a jacking construction area where the communication channel structure to be constructed is located, constructing a first pipe jacking mouth surrounding structure and a second pipe jacking mouth surrounding structure at two ends of the jacking construction area respectively, forming holes in one side of the existing building and the first pipe jacking mouth surrounding structure close to the existing building respectively, forming holes in an outer wall of the adjacent existing building, an underground continuous wall and the second pipe jacking mouth surrounding structure close to the adjacent existing building respectively, and performing communication mouth part construction and node waterproof treatment at the positions of the formed holes;
s4: and placing a pipe jacking device at one end of the jacking construction area through the vertical shaft, performing pipe jacking construction through a propelling device, cutting an enclosure structure and a waterproof curtain in the jacking construction area after the jacking construction is finished, dismantling and recovering the pipe jacking device, and performing waterproof treatment on a node at a communication port of the communication channel structure to finish the construction of the communication channel structure.
Preferably, in step S1, the floor of the existing building is excavated downward to an original foundation, a hole is formed in the original foundation by micro-disturbance, and a steel pipe pile is driven into the hole of the original foundation by a static pressure method.
Preferably, the step S1 further includes: after original foundation was accomplished and is consolidated original foundation upper portion construction is located the double-layered wall beam of existing building wall both sides, and install in press from both sides wall beam bottom and be located adjacent two press from both sides the last joist structure between the wall beam, continue excavation downwards after the construction is accomplished, chisel removes original foundation the joist structure under the construction of last joist structure lower part.
Preferably, in the step S2, bored piles are used in the inner side of the enclosure of the shaft, and MJS-method piles are used in the outer side of the enclosure to construct the waterproof curtain.
Preferably, in step S3, the first top-nozzle enclosure structure and the second top-nozzle enclosure structure include a glass fiber concrete cast-in-place pile disposed close to the existing building or adjacent existing building, and a jet grouting pile disposed close to the glass fiber concrete cast-in-place pile and far away from the existing building or adjacent existing building.
Preferably, in the step S3, a static cutting method is adopted to open holes in the enclosure structure of the shaft, the first pipe jacking mouth enclosure structure, the second pipe jacking mouth enclosure structure, the adjacent existing building outer wall and the underground continuous wall.
Preferably, in step S4, the communication port of the communication channel structure is constructed by pouring impervious concrete with a level higher than that of the original structure, a rubber water stop is buried in the communication port, and a water-swelling water stop strip and a full-face grouting pipe are arranged at the interface between the new concrete and the old concrete at the communication port of the adjacent existing building basement structure.
Preferably, in step S4, the earthwork transport apparatus includes a gantry crane and an electric flat transport vehicle, the gantry crane is disposed above the shaft in a crossing manner, and both the gantry crane and the electric flat transport vehicle can slide along the shaft top ground.
The invention has the following effects: the invention relates to a subsurface excavation construction method for additionally arranging a basement and a communicating channel structure under an existing building, which comprises the steps of firstly reinforcing the wall body and the original foundation of the existing building, limiting the deformation and uneven settlement of the upper structure of the existing building during later excavation construction, constructing a vertical shaft which can be communicated with a jacking construction area in the existing building, respectively constructing pipe jacking port enclosure structures at two ends of the jacking construction area, preventing the water seepage of the pipe jacking working area during construction, opening holes in the vertical shaft of the existing building, the outer wall of the basement structure of the adjacent existing building, an underground continuous wall and the corresponding pipe jacking port enclosure structures, implementing jacking construction by adopting a non-receiving well pipe jacking construction technology, and communicating the basement structures of the existing building and the adjacent existing building through the communicating channel structure. The underground excavation construction method for additionally arranging the basement and the communicating channel structure under the existing building can safely and efficiently complete the addition of the basement structure of the existing building and the excavation and the communication channel structure, realize the connection of the existing building and the adjacent basement structure of the existing building, and improve the resource utilization rate of the underground space of the existing building; a vertical shaft in the existing building is used as a working well of the pipe jacking equipment, and a receiving-free well top pipe construction technology is adopted, so that the construction procedures are reduced; moreover, the excavation range of the underground excavation construction method is small, the influence of foundation pit excavation on the surrounding environment is effectively reduced, the construction period is shortened, and good social benefit and economic benefit are achieved.
Drawings
FIG. 1 is a schematic structural diagram of an existing building in an embodiment of a subsurface excavation construction method for additionally arranging a basement and a communication passage structure under the existing building;
FIG. 2 is a schematic view of a static pressure steel pipe column and upper and lower joist structures constructed under the basement floor of an existing building according to an embodiment of the present invention;
fig. 3 is a schematic view of an underground excavation construction shaft in an existing building according to an embodiment of the present invention;
FIG. 4 is a plan view of an existing building, an adjacent existing building, and a communication channel structure therebetween according to an embodiment of the present invention;
FIGS. 5 and 6 are schematic views illustrating a construction of a communication passage structure between an existing building and an adjacent existing building according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a pipe jacking apparatus installed in a jacking construction area to perform jacking construction in an embodiment of the present invention;
FIG. 8 is a schematic diagram of a via structure according to an embodiment of the present invention;
FIG. 9 is a schematic structural view of an earth moving equipment according to an embodiment of the present invention;
fig. 10 is a schematic view of an electric flat carrier vehicle according to an embodiment of the present invention.
The numbers in the figures are as follows:
existing building 1; a strip foundation 2; a steel pipe pile 3; a wall clamping beam 4; an upper joist structure 5; a lower joist structure 6; a shaft 10; drilling a cast-in-place pile 11; MJS construction method pile 12; a first pipe jacking port enclosure structure 15; a pipe jacking port surrounding structure II 15'; a glass fiber concrete cast-in-place pile 15 a; a jet grouting pile 15 b;
adjacent existing building 20; adjacent existing building exterior walls 21; underground diaphragm walls 22;
jacking into the construction area 30; a pipe jacking device 40; a propulsion device 50; a communicating channel structure 60; a gantry crane 70; an electric flat carrier vehicle 71.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. For convenience of description, the directions of "up" and "down" described below are the same as the directions of "up" and "down" in the drawings, but this is not a limitation of the technical solution of the present invention.
The underground excavation construction method for additionally arranging the basement and the communication channel structure under the existing building is described by combining the figures 1 to 10, the underground excavation construction method is suitable for the condition that the existing building 1 is not connected with the underground layer of the adjacent existing building 20, the overground part of the existing building 1 of the embodiment is a reinforced concrete structure and is not provided with the basement structure, the original foundation forms are a bar-shaped foundation 2 of reinforced concrete and a plurality of under-column independent foundations, the adjacent existing building 20 is a multi-layer reinforced concrete structure, the existing basement structure of the underground existing building has an enclosure structure in the form of an underground continuous wall 22, the construction aim is to newly increase the multi-layer basement under the existing building 1 and is connected with the basement structure of the adjacent existing building 20 through the underground communication channel, and the concrete construction steps are as follows:
s1: firstly, defining the surrounding environment of a construction site, the characteristics of an underground soil layer of an existing building 1 and the arrangement condition of a strip foundation 2, determining the number of layers and the height of a basement structure to be built, the length and the depth of an underground communication channel and the like, and taking support and reinforcement measures for the wall body of the existing building 1 and the strip foundation 2 as shown in fig. 1 and 2;
s2: as shown in fig. 3, enclosing is performed at the position of a preset shaft 10 at the bottom of an existing building 1, and meanwhile, considering that the clearance height inside the existing building 1 is low, low pile frames are required to be adopted at the position of the preset shaft 10 for enclosing structure construction, earth is excavated after the enclosing structure construction is completed, and a sequential construction method is adopted in the shaft 10 for constructing a basement structure of the existing building 1;
s3: as shown in fig. 4 and 5, the region (i.e., the jacking construction region 30) through which the jacking pipe construction needs to pass is subjected to obstacle clearing treatment, a first jacking pipe orifice enclosure structure 15 and a second jacking pipe orifice enclosure structure 15 'are respectively constructed at two ends of the jacking construction region 30 to prevent water seepage in a jacking pipe working region during construction, holes are respectively formed in one side of a vertical shaft 10 of an existing building 1 and the first jacking pipe orifice enclosure structure 15 close to the vertical shaft 10, holes are respectively formed in an outer wall 21 of a basement structure of an adjacent existing building 20, an underground continuous wall 22 and the second jacking pipe orifice enclosure structure 15' close to the adjacent existing building 20, and communication port part construction and node waterproof treatment are carried out at the hole opening positions;
s4: as shown in fig. 6 to 8, a pipe jacking device 40 is installed at one end of the jacking construction area 30 through the shaft 10, and pipe jacking construction is performed through a propelling device 50; and after the jacking construction is finished, cutting off the enclosure structure and the waterproof curtain of the jacking construction area 30, dismantling and recovering the pipe jacking equipment 40, performing waterproof treatment on the node at the communication port of the communication channel structure 60, and finishing the construction of the communication channel structure 60, so that the existing building 1 and the basement structure adjacent to the existing building 20 are communicated through the communication channel structure 60.
The invention relates to a subsurface excavation construction method for additionally arranging basements and communicating channel structures under an existing building, which comprises the steps of firstly reinforcing the wall body and the original foundation of the existing building 1, limiting the deformation and uneven settlement of the upper structure of the existing building 1 during later excavation construction, constructing a vertical shaft 10 which can be communicated with a jacking construction area 30 in the existing building 1, respectively constructing pipe jacking enclosure structures at two ends of the jacking construction area 30, preventing water seepage in the pipe jacking working area during construction, excavating holes in the vertical shaft 10 of the existing building 1, the outer wall 21 of the basement structure of the adjacent existing building 20, an underground continuous wall 22 and the corresponding pipe jacking opening enclosure structure, implementing jacking construction by adopting a non-receiving well pipe jacking construction technology, and communicating the basement structures of the existing building 1 and the adjacent existing building 20 through the communicating channel structure 60. The underground excavation construction method for additionally arranging the basement and the communicating channel structure 60 under the existing building 1 can safely and efficiently complete the addition of the basement structure of the existing building 1 and the excavation and the communication of the communicating channel structure 60, realize the connection of the basement structure of the existing building 1 and the adjacent existing building 20, and improve the resource utilization rate of the underground space of the existing building 1; the vertical shaft 10 in the existing building 1 is used as a working shaft of the downward pipe jacking equipment 40, and a receiving-free well pipe jacking construction technology is adopted, so that the construction procedures are reduced; moreover, the excavation range of the underground excavation construction method is small, the influence of foundation pit excavation on the surrounding environment is effectively reduced, the construction period is shortened, and good social benefit and economic benefit are achieved.
As shown in fig. 1 and 2, in step S1, a bottom plate of the existing building 1 is excavated downward to the strip foundation 2, a micro-disturbance hole is formed in the strip foundation 2, and the steel pipe pile 3 is driven into the hole of the strip foundation 2 by a static pressure method by using a low clearance static pressure steel pipe pile 3 construction method, so as to reinforce the strip foundation 2 of the existing building 1.
As shown in fig. 2, the step S1 further includes: after the strip foundation 2 is reinforced, the wall clamping beams 4 on two sides of the wall body of the existing building 1 are constructed on the upper portion of the strip foundation 2, the upper joist structure 5 which is arranged at the bottom of each wall clamping beam 4 and is positioned between every two adjacent wall clamping beams 4 is constructed, downward excavation is continued after construction, the strip foundation 2 is chiseled off, the lower joist structure 6 is constructed below the upper joist structure 5, a joist structure is newly added at the bottom of the existing building 1, the original strip foundation 2 is dismantled, the upper joist structure 6 and the lower joist structure can indirectly transmit the upper structure load of the existing building 1 to the steel pipe pile 3 at the bottom, an integral foundation form for transmitting and bearing the upper structure load of the existing building 1 is formed by combining the steel pipe column and the joist structures, and accordingly deformation and uneven settlement generated in the later excavation process of the upper structure of the existing building 1 are limited.
As shown in fig. 3, in step S2, bored piles 11 are used inside the enclosure of the shaft 10, and after the construction of the bored piles is completed, the waterproof curtain construction is performed outside the enclosure of the shaft 10 by using the MJS-method piles 12 (using the omni-directional high-pressure injection method), so that the shaft 10 can be reinforced omni-directionally, and the disturbance on the surrounding environment and the foundation is slightly affected.
In step S3, the full slewing drilling machine is used to perform obstacle clearing processing on the pipe jacking construction area 30, and the problems of earth excavation and transportation in a narrow space are solved by using earth excavation and transportation equipment.
As shown in fig. 5, in step S3, the first top-pipe mouth enclosure structure 15 and the second top-pipe mouth enclosure structure 15' include a glass fiber concrete cast-in-place pile 15a near the outer wall of the existing building 1 or the adjacent existing building 20, and a jet grouting pile 15b disposed outside the glass fiber concrete cast-in-place pile 15a as a waterproof curtain for jacking into the construction area 30, and after the jacking construction is completed, the enclosure structure using the glass fiber concrete cast-in-place pile 15a is easier to cut and remove. The glass fiber concrete is composed of broken stones, fine sand, cement, water, glass fiber, a water reducing agent and the like, wherein the content of the glass fiber in each cubic meter of concrete block is 20-40kg/m3The prepared concrete is sprayed out through a slurry pump pipeline and is stirred and mixed to form a pile, the anti-cracking performance of the concrete is greatly improved, the glass fibers in the pile are distributed in a three-dimensional disorderly direction, and the toughness and the bending strength of the pile body are improved through the interaction of the cement base material and the glass fibers.
Preferably, in step S3, a static cutting method is used to cut holes in the enclosure structure of the shaft 10, the first pipe jacking mouth enclosure structure 15, the second pipe jacking mouth enclosure structure 15', the outer wall of the adjacent existing building 20 and the underground continuous wall 22, the static cutting method is to grind and cut the enclosure structure and the wall at a designated position by means of diamonds under the action of high-speed movement, and the static cutting method has the advantages of no vibration, no damage and the like.
In step S4, the communication port of the communication channel between the existing building 1 and the basement structure of the adjacent existing building 20 is made of impervious concrete with a grade higher than the original structure, and is made of a middle-buried rubber water stop for water proofing, and a water-swelling water stop strip and a full-section grouting pipe are arranged at the interface between the new and old concrete in the construction of the communication port with the basement structure of the adjacent existing building 20, so as to prevent the communication port from affecting the engineering quality due to water seepage.
As shown in fig. 9 and 10, in step S4, the earthwork transportation apparatus includes a gantry crane 70 and an electric flat transport vehicle 71, the gantry crane 70 is disposed above the shaft 10 in a crossing manner, two ends of the gantry crane can slide along the ground on two sides of the top of the shaft 10, the gantry crane 70 can lift the waste such as earthwork out of the shaft 10 through a transportation box, and a constructor can realize vertical transportation of earthwork through the remote-control electric flat transport vehicle 71, so as to improve the efficiency of earthwork transportation during low clearance excavation and solve the problem of unearthing in the building room.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (6)
1. The underground excavation construction method for additionally arranging the basement and the communication passage structure under the existing building is characterized by comprising the following steps of:
s1: supporting and reinforcing the wall body and the original foundation of the existing building, excavating downwards the bottom plate of the existing building to the original foundation, micro-disturbance tapping is carried out on the original foundation, the steel pipe pile is driven into the tapping position of the original foundation by a static pressure method, building an enclosure structure and a waterproof curtain at the position of a vertical shaft preset at the bottom of the existing building, after the original foundation is reinforced, constructing wall clamping beams positioned at two sides of the existing building wall body and an upper joist structure which is arranged at the bottom of the wall clamping beams and positioned between two adjacent wall clamping beams on the upper part of the original foundation, continuously excavating downwards after the construction is finished, chiseling the original foundation, constructing a lower joist structure at the lower part of the upper joist structure, wherein the wall clamping beam is positioned at the top end of the steel pipe pile, the upper joist structure is positioned between two adjacent steel pipe piles, and the upper joist structure and the lower joist structure are connected with the enclosure structure of the vertical shaft;
s2: excavating earth, and constructing a basement structure of the existing building in the vertical shaft by adopting a sequential construction method;
s3: clearing obstacles in a jacking construction area where a communication channel structure to be constructed is located, constructing a first pipe jacking mouth surrounding structure and a second pipe jacking mouth surrounding structure at two ends of the jacking construction area respectively, forming holes in one side of a vertical shaft of an existing building and the first pipe jacking mouth surrounding structure close to the vertical shaft respectively, forming holes in an outer wall, an underground continuous wall and the second pipe jacking mouth surrounding structure close to the existing building respectively, and performing communication mouth part construction and node waterproof treatment at the positions of the formed holes;
s4: and placing a pipe jacking device at one end of the jacking construction area through the vertical shaft, performing pipe jacking construction through a propelling device, cutting an enclosure structure and a waterproof curtain in the jacking construction area after the jacking construction is finished, dismantling and recovering the pipe jacking device, and performing waterproof treatment on a node at a communication port of the communication channel structure to finish the construction of the communication channel structure.
2. The underground excavation construction method according to claim 1, characterized in that: in the step S1, bored piles are adopted on the inner side of the enclosure structure of the shaft, and water-stop curtain construction is performed on the outer side of the enclosure structure by adopting MJS construction method piles.
3. The underground excavation construction method according to claim 1, characterized in that: in the step S3, the first pipe jacking mouth enclosure structure and the second pipe jacking mouth enclosure structure include a glass fiber concrete cast-in-place pile arranged close to the existing building or adjacent existing building, and a jet grouting pile tightly attached to the glass fiber concrete cast-in-place pile and arranged far away from the existing building or adjacent existing building.
4. The underground excavation construction method according to claim 1, characterized in that: and in the step S3, holes are drilled on the enclosure structure of the vertical shaft, the first pipe jacking opening enclosure structure, the second pipe jacking opening enclosure structure, the adjacent existing building outer wall and the underground continuous wall by adopting a static cutting method.
5. The underground excavation construction method according to claim 1, characterized in that: in the step S4, the communication port of the communication channel structure is constructed by pouring impervious concrete higher than the original structure by one grade, a rubber water stop is buried in the communication port, and a water-swelling water stop strip and a full-section grouting pipe are arranged at the interface between the new concrete and the old concrete at the communication port of the adjacent existing building basement structure.
6. The underground excavation construction method according to claim 1, characterized in that: in step S4, the earthwork transport apparatus includes a gantry crane and an electric flat transport vehicle, the gantry crane is spanned above the shaft, and both the gantry crane and the electric flat transport vehicle can slide along the ground at the top of the shaft.
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| CN112538981A (en) * | 2020-11-26 | 2021-03-23 | 上海建工四建集团有限公司 | Old building basement obstacle removing and new building pile foundation synchronous construction method |
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| CN104453274B (en) * | 2014-11-25 | 2016-02-17 | 山东建筑大学 | Utilize supporting and protection structure and underpinning structure to support existing building underground and increase layer method |
| CN105401582B (en) * | 2015-12-03 | 2017-07-14 | 上海建工一建集团有限公司 | Suspension type excavation device and construction method for bi-directional synchronization adverse construction method |
| KR102320104B1 (en) * | 2017-12-20 | 2021-11-02 | 양경옥 | Method for Alternate Basement Vertical Structure Construction Method in Top Down Construction Project |
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