阅读说明：本技术 既有建筑下增设地下室及地下连通道的明挖施工方法 (Open excavation construction method for additionally arranging basement and underground communication channel under existing building ) 是由 朱毅敏 徐磊 陈家昊 于 2019-07-22 设计创作，主要内容包括：本发明的既有建筑下增设地下室及地下连通道的明挖施工方法,涉及既有建筑改建技术领域。针对采用现有的明挖法在既有建筑下增设地下室及地下连通道施工难度较大的问题。步骤如下：对既有建筑的原有基础进行托换加固,并在既有建筑原有外墙开设洞口便于施工人员通行以实施机械施工与材料运输,在既有建筑外部拟增设地下连通道区域及其内部拟增设地下室区域进行基坑围护后开挖土方,浇筑施工既有建筑地下室及地下连通道,在与地下连通道两端相对应的既有建筑、相邻已有建筑的外墙及地下连续墙开洞,使得既有建筑地下室通过地下连通道与相邻已有建筑地下室连为一体。(The invention discloses an open cut construction method for additionally arranging a basement and an underground communication channel under an existing building, and relates to the technical field of reconstruction of the existing building. The problem that the construction difficulty is high when basements and underground communication channels are additionally arranged under existing buildings by adopting an existing open cut method is solved. The method comprises the following steps: underpinning and reinforcing an original foundation of an existing building, forming a hole in an original outer wall of the existing building to facilitate passage of constructors to implement mechanical construction and material transportation, excavating earthwork after enclosing a foundation pit in an area where an underground communication channel is to be additionally arranged outside the existing building and an area where an underground chamber is to be additionally arranged inside the existing building, pouring and constructing an existing building basement and the underground communication channel, and forming holes in the outer wall and the underground continuous wall of the existing building and the adjacent existing building corresponding to two ends of the underground communication channel so that the existing building basement is connected with the adjacent existing building basement into a whole through the underground communication channel.)

1. The open excavation construction method for additionally arranging the basement and the underground communication channel under the existing building is characterized by comprising the following steps of:

s1: underpinning and reinforcing the original foundation of the existing building;

s2: opening a hole on the original outer wall of the existing building close to the region where the underground communication channel is to be additionally arranged;

s3: performing foundation pit enclosure and waterproof curtain construction in an underground communication channel region to be additionally arranged outside the existing building and an underground room region to be additionally arranged inside the existing building, excavating earthwork in the underground communication channel region to be additionally arranged and above the underground communication channel region to be additionally arranged and erecting an internal support, and constructing the existing building basement and the underground communication channel by adopting a forward method;

s4: and respectively forming holes in the outer walls and the underground continuous walls of the existing building and the basements of the adjacent existing buildings corresponding to the two ends of the underground communication channel, connecting the existing building and the basements of the adjacent existing buildings into a whole, and finally, backfilling earthwork at the top and two sides of the underground communication channel to complete the addition of the existing building basements and the underground communication channel and realize the communication with the basements of the adjacent existing buildings.

2. The open cut construction method according to claim 1, characterized in that: in the step S1, a bottom plate of an area to be additionally provided with a basement inside the existing building is excavated downwards to the original foundation, micro-disturbance boring is performed on the original foundation, and a steel pipe pile is driven into the bored part of the original foundation by a static pressure method.

3. The open excavation construction method according to claim 2, wherein the step S1 further includes: after original foundation is finished reinforcing, the wall clamping beams on the two sides of the existing building wall body are constructed on the upper portion of the original foundation, the upper supporting beam structure is installed on the bottom of the wall clamping beams and located two adjacent upper supporting beam structures between the wall clamping beams, downward excavation is continued after construction is finished, the original foundation is chiseled, and the lower supporting beam structure is constructed below the upper supporting beam structure.

4. The open cut construction method according to claim 1, characterized in that: in the step S2, a joist is additionally provided above the opening of the original outer wall of the existing building.

5. The open cut construction method according to claim 1, characterized in that: in the step S2, constructing fender posts by adopting low-clearance cast-in-place piles in an area to be additionally provided with a basement inside the existing building, constructing fender posts by adopting conventional cast-in-place piles in an area to be additionally provided with an underground communication channel outside the existing building, arranging foundation pit steel supports, and after the fender posts are constructed, constructing a waterproof curtain outside the fender posts by adopting an MJS construction method.

6. The open cut construction method according to claim 1, wherein the step S3 further comprises: determining whether partition construction is needed according to the length-width ratio of a foundation pit where an underground communication channel region and a basement region to be added are located, when the length-width ratio of the foundation pit is less than or equal to 3, partition construction is not needed, excavating earthwork in the underground communication channel region to be added and above the underground communication channel region to be added by adopting an open excavation method, excavating earthwork from the outside and the inside of the basement region to be added by adopting an excavation mode, and directly transporting earthwork from an external excavation part; when the length-width ratio of the foundation pit is larger than 3, a partition wall needs to be additionally arranged in the middle of the foundation pit for carrying out partition construction on the foundation pit, earthwork excavation and transportation are carried out on a partition close to the existing building, and then excavation is carried out on earthwork of other partitions from near to far in sequence.

7. The open cut construction method according to claim 1, characterized in that: in the step S4, holes are respectively drilled on the basement exterior wall and the underground continuous wall of the existing building and the adjacent existing building corresponding to the two ends of the underground communication channel by a static cutting method.

8. The open cut construction method according to claim 1, characterized in that: in step S4, the communication port of the underground communication channel between the existing building and the adjacent existing building is made of impervious concrete with a level higher than the original structure by one grade, 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 concrete and the old concrete in the construction of the communication port of the underground communication channel and the adjacent existing building basement.

9. The open cut construction method according to claim 1, characterized in that: step S3 with in step S4, adopt the transportation of earthwork transportation equipment the earthwork, the transportation equipment of earthwork includes portal crane and electrodynamic type pallet truck, portal crane stridees across set up in the regional top of basement is planned to add, portal crane with electrodynamic type pallet truck all can follow the regional top ground of basement is planned to add and slides.

Technical Field

The invention relates to the technical field of reconstruction of existing buildings, in particular to an open cut construction method for additionally arranging basements and underground communication channels under existing buildings.

Background

With the development of urbanization process, city development is gradually improved, the construction requirement of the city is gradually changed from new construction to addition and reconstruction, at present, the research on excavation of in-situ foundation pits of the existing building and communication with adjacent buildings is less, the requirement for adding basements and underground communication channels under the existing building in actual engineering is urgent, the construction of adding basements and underground communication channels under the existing building generally relates to the procedures of foundation protection, excavation of foundation pits, dismantling of building enclosures, connection of underground communication channels and the like of the existing building, and meanwhile, the problems of high requirement on the environmental protection of the periphery of the foundation pits, narrow construction site, many site obstacles, difficult earthwork transportation and the like are often faced, so that the selection of construction methods and the arrangement of construction procedures are highly required, and in addition, the selection of the construction methods of the underground communication channels also has great influence on the engineering construction, resulting in greater difficulty in engineering construction.

Disclosure of Invention

Aiming at the problem that the construction difficulty of additionally arranging basements and underground communicating channels under the existing building by adopting the existing open cut method is high, the invention aims to provide the open cut construction method for additionally arranging the basements and the underground communicating channels under the existing building.

The technical scheme adopted by the invention for solving the technical problems is as follows: the open excavation construction method for additionally arranging the basement and the underground communication channel under the existing building comprises the following steps:

s1: underpinning and reinforcing the original foundation of the existing building;

s2: opening a hole on the original outer wall of the existing building close to the region where the underground communication channel is to be additionally arranged;

s3: performing foundation pit enclosure and waterproof curtain construction in an underground communication channel region to be additionally arranged outside the existing building and an underground room region to be additionally arranged inside the existing building, excavating earthwork in the underground communication channel region to be additionally arranged and above the underground communication channel region to be additionally arranged and erecting an internal support, and constructing the existing building basement and the underground communication channel by adopting a forward method;

s4: and respectively forming holes in the outer walls and the underground continuous walls of the existing building and the basements of the adjacent existing buildings corresponding to the two ends of the underground communication channel, connecting the existing building and the basements of the adjacent existing buildings into a whole, and finally, backfilling earthwork at the top and two sides of the underground communication channel to complete the addition of the existing building basements and the underground communication channel and realize the communication with the basements of the adjacent existing buildings.

Preferably, in step S1, a bottom plate of an area to be additionally provided with a basement inside the existing building is excavated downwards to the original foundation, a micro-disturbance hole is formed in the original foundation, 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 is finished reinforcing, the wall clamping beams on the two sides of the existing building wall body are constructed on the upper portion of the original foundation, the upper supporting beam structure is installed on the bottom of the wall clamping beams and located two adjacent upper supporting beam structures between the wall clamping beams, downward excavation is continued after construction is finished, the original foundation is chiseled, and the lower supporting beam structure is constructed below the upper supporting beam structure.

Preferably, in step S2, a joist is additionally provided above the hole of the original outer wall of the existing building.

Preferably, in step S2, constructing fender posts by using low-clearance cast-in-place piles in an area where basements are to be additionally arranged inside the existing building, constructing fender posts by using conventional cast-in-place piles in an area where underground communication channels are to be additionally arranged outside the existing building, and setting foundation pit steel supports, and after the fender posts are constructed, constructing water-stop curtains on the outer sides of the fender posts by using the MJS method.

Preferably, the step S3 further includes: determining whether partition construction is needed according to the length-width ratio of a foundation pit where an underground communication channel region and a basement region to be added are located, when the length-width ratio of the foundation pit is less than or equal to 3, partition construction is not needed, excavating earthwork in the underground communication channel region to be added and above the underground communication channel region to be added by adopting an open excavation method, excavating earthwork from the outside and the inside of the basement region to be added by adopting an excavation mode, and directly transporting earthwork from an external excavation part; when the length-width ratio of the foundation pit is larger than 3, a partition wall needs to be additionally arranged in the middle of the foundation pit for carrying out partition construction on the foundation pit, earthwork excavation and transportation are carried out on a partition close to the existing building, and then excavation is carried out on earthwork of other partitions from near to far in sequence.

Preferably, in step S4, holes are respectively drilled in the basement exterior wall and the underground continuous wall of the existing building and the adjacent existing building corresponding to the two ends of the underground communication channel by a static cutting method.

Preferably, in step S4, the communication port of the underground communication channel between the existing building and the adjacent existing building is made of impervious concrete with a level higher than the original structure by one grade, and is waterproof by a middle-buried rubber water stop, and a water-swelling water stop strip and a full-section grouting pipe are disposed at the interface between the new concrete and the old concrete in the communication port construction of the underground communication channel and the basement of the adjacent existing building.

Preferably, in step S3 and step S4, earthwork transportation equipment is adopted to transport the earthwork, the earthwork transportation equipment includes a gantry crane and an electric flat transporter, the gantry crane is spanned and disposed above the to-be-added basement region, and both the gantry crane and the electric flat transporter can slide along the ground of the top of the to-be-added basement region.

The invention has the following effects: the invention relates to an open cut construction method for additionally arranging basements and underground communicating channels under an existing building, which comprises the following steps of firstly, underpinning and reinforcing the original foundation of the existing building, forming a hole on the original outer wall of the existing building to facilitate the passage of constructors to carry out mechanical construction and material transportation, excavating earthwork after enclosing a foundation pit in an area where the underground communicating channels are to be additionally arranged outside the existing building and an area where the underground chambers are to be additionally arranged inside the existing building, pouring and constructing the existing building basements and the underground communicating channels, and forming holes on the existing building corresponding to two ends of the underground communicating channels, the outer wall of an adjacent existing building and an underground continuous wall, so that the existing building basements are connected with the adjacent existing building basements into a whole through the underground communicating channels; the open cut construction method of the invention firstly adopts underpinning reinforcement measures with low disturbance, high efficiency and high strength to the original foundation of the existing building, then adopts the open cut method to respectively construct the basement of the existing building and the underground communication channel, and completes the communication of the underground communication channel by punching the wall bodies of the basement of the existing building and the adjacent existing building, thereby reducing the influence on the surrounding environment, safely, efficiently and economically completing the addition of the basement of the existing building, realizing the connection of the existing building and the adjacent basement of the existing building, improving the resource utilization rate of the underground space of the existing building, solving the reconstruction construction difficulty of the underground space of the existing building, effectively reducing the construction cost, shortening the construction period and having good social benefit and economic benefit.

Drawings

FIG. 1 is a plan view of an existing building, a newly built building, an area where basements are to be added, and an area where underground communication paths are to be added in an embodiment of an open cut construction method for adding basements and underground communication paths under the existing building;

FIG. 2 is a schematic diagram of the structure of the existing foundation of an existing building according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of underpinning and reinforcing an existing foundation of an existing building in accordance with an embodiment of the present invention;

FIG. 4 is a schematic view of an additional basement under an existing building according to one embodiment of the present invention;

FIG. 5 is a schematic diagram of a foundation pit construction enclosure and a waterproof curtain in a region where an underground chamber is to be additionally arranged and a region where an underground communication channel is to be additionally arranged according to an embodiment of the present invention;

FIG. 6 is a schematic view of the connection between the basement of the existing building and the underground communication channel according to an embodiment of the present invention;

FIG. 7 is a cross-sectional view A-A of FIG. 6;

FIG. 8 is a cross-sectional view B-B of FIG. 6;

FIG. 9 is a schematic view of the connection between the basement and the underground communication channel of an adjacent existing building according to an embodiment of the present invention;

FIG. 10 is a schematic structural view of an earth moving equipment according to an embodiment of the present invention;

fig. 11 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:

an existing building 10; a strip foundation 11; a steel pipe pile 12; the wall clamping beam 14; an upper joist structure 15; a lower joist structure 16; the original exterior wall 17; a joist 18; an opening 19; adjacent existing building 20; an adjacent existing building basement exterior wall 21; adjacent existing building underground diaphragm walls 22;

a basement area 30 is to be added; an underground communication channel area 40 is to be additionally arranged; existing building basements 50; a low-clearance cast-in-situ bored pile 51; a waterproof curtain 52; a partition wall 53; an underground communication passage 60; conventional cast-in-place bored pile 61; 70 of backfill soil; a gantry crane 80; an electric flat transporter 90.

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 invention is described with reference to fig. 1 to 11, in which the underground portion of the existing building 10 is a reinforced concrete structure and has no basement structure, the original foundation form is a bar-shaped foundation 11 of reinforced concrete and a plurality of independent foundations under columns, the adjacent existing building 20 is a multi-layer reinforced concrete structure, the basement has an enclosure structure in the form of an underground continuous wall, the construction purpose is to add a multi-layer basement under the existing building 10 and connect the basement of the adjacent existing building 20 through an underground communication channel 60, 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 10 and the arrangement condition of strip-shaped foundations 11 of the existing building, determining the number of layers and the height of the newly-added multi-layer basement, the length and the depth of an underground communication channel 60 and the like, and underpinning and reinforcing the original foundation of the existing building 10 as shown in fig. 2 and 3;

s2: referring to fig. 1, 6 to 8, a hole 19 is formed in an original outer wall 17 of an existing building 10, which is close to an area 40 where an underground communication channel is to be added, so that constructors can conveniently pass through the hole to carry out mechanical construction and material transportation;

s3: referring to fig. 1, 4 and 5, constructing a foundation pit enclosure and a waterproof curtain 52 in an area 40 to be additionally provided with an underground communication channel outside the existing building 10 and an area 30 to be additionally provided with a basement inside the existing building, excavating earthwork in the area 40 to be additionally provided with the underground communication channel and above the area and 30 to be additionally provided with the basement, erecting an internal support, and constructing the existing building basement 50 and the underground communication channel 60 by a forward method;

s4: as shown in fig. 6 to 9, holes are respectively formed in the outer wall of the basement and the underground continuous wall of the existing building 10 and the adjacent existing building 20 corresponding to the two ends of the underground communication channel 60, the existing building 10 and the basement of the adjacent existing building 20 are connected into a whole, and finally, earth backfilling (i.e., backfilling 70 in the drawing) is performed on the top and two sides of the underground communication channel 60, so that the addition of the basement 50 of the existing building and the underground communication channel 60 is completed, and the communication with the basement of the adjacent existing building 20 is realized.

The invention relates to an open cut construction method for additionally arranging basements and underground communicating channels under an existing building, which comprises the steps of firstly, underpinning and reinforcing the original foundation of the existing building 10, arranging a hole 19 on the original outer wall 17 of the existing building 10 to facilitate the passage of constructors for mechanical construction and material transportation, excavating earthwork after foundation pit enclosure is carried out on an underground communicating channel region 40 to be additionally arranged outside the existing building 10 and an underground communicating channel region 30 to be additionally arranged inside the existing building, pouring and constructing the existing building basements 50 and the underground communicating channels 60, and arranging holes on the outer walls and underground continuous walls of the existing building 10, the adjacent existing building 20 corresponding to the two ends of the underground communicating channel 60, so that the existing building basements 50 are connected with the adjacent existing building 20 basements into a whole through the underground communicating channels 60; the open cut construction method of the invention firstly adopts low disturbance, high efficiency and high strength underpinning reinforcement measures for the original foundation of the existing building 10, then adopts the open cut method to respectively construct the basement 50 of the existing building and the underground communicating channel 60, and completes the communication of the underground communicating channel 60 by opening holes on the wall bodies of the basement of the existing building 10 and the adjacent existing building 20, thereby reducing the influence on the surrounding environment, safely, efficiently and economically completing the addition of the basement 50 of the existing building, realizing the connection of the basement of the existing building 10 and the adjacent existing building 20, improving the resource utilization rate of the underground space of the existing building 10, solving the reconstruction construction difficulty of the underground space of the existing building 10, effectively reducing the construction cost, shortening the construction period and having good social benefit and economic benefit.

As shown in fig. 2 and 3, in step S1, a floor of the area 30 to be additionally provided with the basement in the existing building 10 is excavated downwards to the strip-shaped foundation 11, a micro-disturbance hole is formed in the strip-shaped foundation 11, and a low-clearance static pressure steel pipe pile is driven into the hole of the strip-shaped foundation 11 by a static pressure method to reinforce the strip-shaped foundation 11 of the existing building 10, so as to limit deformation and uneven settlement of the upper structure of the existing building 10 during later excavation.

As shown in fig. 3, the step S1 further includes: after the strip foundation 11 is reinforced, the wall clamping beams 14 on two sides of the wall body of the existing building 10 and the upper joist structure 15 which is arranged at the bottom of the wall clamping beams 14 and is positioned between two adjacent wall clamping beams 14 are constructed on the upper portion of the strip foundation 11, downward excavation is continued after the construction is finished, the strip foundation 11 is chiseled off, the lower joist structure 16 is constructed below the upper joist structure 15, a joist structure is additionally arranged at the bottom of the existing building 10, the original strip foundation 11 is removed, the upper joist structure 16 and the lower joist structure can be used for indirectly transmitting the upper structure load of the existing building 10 to the steel pipe pile 12 at the bottom, the steel pipe column and the joist structure are combined to form an integral foundation form for transmitting and bearing the upper structure load of the existing building 10, and therefore deformation and uneven settlement generated in the later excavation process of the upper structure of the existing building 10 are limited.

As shown in fig. 7 and 8, in step S2, a joist 18 is additionally provided above the hole 19 of the original outer wall 17 of the existing building 10 to reinforce the original outer wall 17 of the existing building 10, so as to ensure the safety of the subsequent construction.

As shown in fig. 5, in step S2, since the construction height inside the existing building 10 is limited, a fender pile needs to be constructed by using a low-clearance cast-in-place pile 51 in the region 30 to be additionally provided with a basement inside the existing building 10, a fender pile is constructed by using a conventional cast-in-place pile 61 in the region 40 to be additionally provided with an underground communication passage outside the existing building 10, a foundation pit steel support is provided, and after the fender pile is constructed, a waterproof curtain 52 is constructed by using the MJS method outside the fender pile.

With continuing reference to fig. 5, the step S3 further includes determining whether partition construction is required according to the length-width ratio of the foundation pit where the underground communication passage area 40 and the basement area 30 to be added are located; when the length and width of the foundation pit are small (generally less than or equal to 3), partition construction is not needed, a conventional open cut method is adopted to perform excavation of earthwork above the underground communication channel region 40 to be additionally arranged, then, excavation of earthwork is performed from the outside to the inside of the basement region 30 to be additionally arranged in an excavation mode, and earthwork transportation is directly performed from an externally excavated part; when the length and width of the foundation pit are large (generally larger than 3), a partition wall 53 needs to be additionally arranged in the middle of the foundation pit for carrying out partition construction on the foundation pit, earthwork transportation equipment is adopted to preferentially carry out earthwork excavation and transportation on partitions close to the existing building 10, excavation is sequentially carried out on earthwork of other partitions from near to far, and the foundation pit partition excavation is adopted to reduce surrounding buildings and ground settlement and ensure construction safety.

Preferably, as shown in fig. 6 and 9, in step S4, holes are respectively formed in the basement exterior wall and the underground continuous wall of the existing building 10 and the adjacent existing building 20 corresponding to the two ends of the underground communication channel 60 by using a static cutting method, the static cutting method is to perform grinding cutting on the wall according to a designated position under the action of high-speed movement of diamond, and has the advantages of no vibration, no damage and the like.

In step S4, the communication port of the underground communication channel 60 between the existing building 10 and the adjacent existing building 20 is made of impervious concrete with a level higher than the original structure by one, and is waterproof by a middle-buried rubber water stop, 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 in the communication port construction of the underground communication channel 60 and the basement of the adjacent existing building 20, so as to avoid the influence of water seepage on the engineering quality of the communication port.

As shown in fig. 9 and 10, in step S4, an earthwork transportation device is used to transport earthwork, the earthwork transportation device includes a gantry crane 80 and an electric flat transport vehicle 90, the gantry crane 80 is spanned over the region 30 to be additionally provided with a basement, two ends of the gantry crane can slide along the ground on two sides of the top of the region 30 to be additionally provided with a basement, the gantry crane 80 can hoist the waste such as earthwork from the ground through a transport box, and a constructor can transport earthwork vertically through the remote electric flat transport vehicle 90, so as to improve the efficiency of earthwork transportation when excavating at low altitude, and solve the problem of earthwork 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.