CN-122014020-A - Vertical extension construction method for underground space of existing building

CN122014020ACN 122014020 ACN122014020 ACN 122014020ACN-122014020-A

Abstract

The invention relates to the field of building reconstruction and discloses a vertical extension construction method of an existing building underground space, which comprises the following steps of respectively constructing an outer fixed frame and an inner fixed frame on an outer wall and an inner wall of the existing building, wherein the outer fixed frame and the inner fixed frame are connected through a plurality of opposite-pulling screws and fix the root of the existing building; the invention discloses a method for constructing a foundation soil surface of an existing building, which comprises the steps of carrying out preliminary excavation on the inside of the existing building along the vertical direction, forming a trench after the excavation to a certain depth, and arranging a plurality of inner side walls of the trench in a coplanar manner with the inner side walls of an inner fixed frame respectively so as to enlarge the space of the inside of the existing building.

Inventors

GAO YUFEN
CHEN LU
ZHANG ZHONGSHAN
LI JIANAN
XU HONGJIE
JIAO ANLIANG
HUANG LIYUAN

Assignees

中国建筑第七工程局有限公司
阳光学院

Dates

Publication Date: 20260512
Application Date: 20260331

Claims (7)

1. A vertical extension construction method for an existing building underground space is characterized by comprising the following steps: S1, respectively constructing an outer fixing frame (2) and an inner fixing frame (3) on the outer wall and the inner wall of an existing building (1), wherein the outer fixing frame (2) and the inner fixing frame (3) are connected through a plurality of opposite-pulling screws and fix the root of the existing building (1); s2, preliminary excavation is carried out in the existing building (1) along the vertical direction of the existing building to form a digging groove (5), and a plurality of inner side walls of the digging groove (5) are respectively arranged in a coplanar mode with the inner side walls of the inner fixing frame (3) so as to enlarge the space for carrying out inside the existing building (1); S3, a plurality of sliding installation pieces (6) are fixed on the inner fixed frame (3) at equal intervals, and blocking plates (7) are respectively and slidably installed on the plurality of sliding installation pieces (6), the adjacent blocking plates (7) are mutually attached, and the blocking plates (7) are mutually attached to the inner side walls of the digging grooves (5), so that looseness or/and falling of soil on the inner side walls of the digging grooves (5) can be prevented; S4, carrying out secondary downward excavation on the primarily-expanded digging groove (5), wherein the blocking plate (7) can freely drop downwards according to the depth of the digging groove (5), so that the blocking plate (7) can completely block the inner side wall of the digging groove (5); S5, after the space in the existing building (1) is expanded downwards to a designated depth, building an inner pouring template (8) in the grooved (5) so that the inner pouring template (8) and a plurality of blocking plates (7) form a pouring cavity (9) with an opening at the top; s6, pouring concrete in the pouring cavity (9) so that the liquid level of the concrete is flush with the top surface of the blocking plate (7); And S7, after the poured concrete is completely solidified and formed, forming a wall surface of an extension space and disassembling the inner building template (8).
2. A method of vertical construction of an existing building underground space according to claim 1, wherein in step S1, holes are bored in the existing building (1) in advance before the split screws are installed so that the outer fixing frame (2) and the inner fixing frame (3) can be connected by the split screws.
3. The vertical extension construction method of the underground space of the existing building according to claim 1, wherein after the step S3, the same reinforcing rod (10) is installed on the adjacent three blocking plates (7) through fixing bolts so as to reinforce the plurality of blocking plates (3), and the phenomenon of uneven appearance between the adjacent blocking plates (7) is reduced.
4. The method for vertically extending the underground space of the existing building according to claim 1 or 2, wherein in the step S3, when two adjacent barrier plates (7) are installed, the two barrier plates (7) are connected through a limit protrusion (701) and a limit chute (702), so that the tightness between the two barrier plates (7) is enhanced.
5. The method for vertically rubbing the underground space of the existing building according to claim 1, wherein in the step S5, a plurality of supporting frames (11) are fixed on the outer side wall of the inner pouring template (8) at equal intervals, and the bottom ends of the supporting frames (11) are mutually abutted with the inner bottom wall of the digging groove (5) so as to support the inner pouring template (8) and prevent the inner pouring template (8) from tilting or collapsing in the pouring process.
6. The method for vertically rubbing the underground space of the existing building according to claim 4, wherein in the step S5, a plurality of supporting rods (12) are fixed between the blocking plate (7) and the inner pouring template (8) at equal intervals, and the side plate (7) is supported again through the supporting rods (12) so as to prevent the side plate (7) from inclining.
7. The method for vertically rubbing the underground space of the existing building according to claim 1, wherein in the step S6, when concrete is poured into the pouring cavity (9), the concrete is poured for a plurality of times, and the concrete after each pouring is vibrated by a vibrating rod so as to compact the concrete filling.

Description

Vertical extension construction method for underground space of existing building Technical Field The invention relates to the technical field of building transformation, in particular to a vertical extension construction method for an existing building underground space. Background With the continuous high-speed development of national economy for many years, the urban process is continuous and deep, and the scale of infrastructure construction in each region is continuously enlarged. Under the background, the available land resources of cities are increasingly tense, and particularly in urban downtown areas, the development and construction of large underground spaces face remarkable restrictions due to the fact that existing buildings are dense and underground structures are staggered in a complex manner. Taking a central city as an example, with the continuous growth of population, the ground space is difficult to meet the daily demands of residents, and commercial, civil and municipal facilities such as markets, subway stations and the like are gradually expanding to underground deep layers. However, due to factors such as insufficient early people flow estimation and fund cost, the subsequent use requirements of many underground spaces are not fully considered at the beginning of construction, so that the space scale is smaller, and the requirements of practical use after many years are difficult to adapt. In view of the above problems, conventional solutions are usually to demolish and rebuild the original building. However, this approach is not only costly to build, but also longer in construction cycle. Although there is also an attempt to excavate down on the basis of the original building to enlarge the usable floor area, in the actual extension process, the soil on the side of the excavated groove is easy to fall, which results in weaker soil surface of the foundation of the existing building, influences the foundation of the original building, and even results in cracking and other problems of the building structure, which affects the overall safety and the service life of the building. So we propose a vertical extension construction method of the existing building underground space, so as to solve the above mentioned problems. Disclosure of Invention The present invention aims to solve the technical problems mentioned above. In order to achieve the above purpose, the invention adopts the following technical scheme: A vertical extension construction method for the underground space of the existing building comprises the following steps: S1, respectively building an outer fixing frame and an inner fixing frame on the outer wall and the inner wall of an existing building, wherein the outer fixing frame and the inner fixing frame are connected through a plurality of opposite-pulling screws and fix the root of the existing building; s2, carrying out preliminary excavation in the interior of the existing building along the vertical direction of the existing building, forming a excavated groove after the excavation is carried out to a certain depth, and arranging a plurality of inner side walls of the excavated groove in a coplanar mode with the inner side walls of the inner fixed frame respectively so as to enlarge the space for carrying out in the interior of the existing building; s3, equidistantly fixing a plurality of sliding installation pieces on the inner fixed frame, and respectively sliding installing blocking plates on the plurality of sliding installation pieces, wherein the adjacent blocking plates are mutually attached, and each blocking plate is mutually abutted with the inner side wall of the digging groove so as to prevent soil on the inner side wall of the digging groove from loosening or/and falling; s4, carrying out secondary excavation on the initially-expanded digging groove, wherein the blocking plate can freely drop downwards according to the depth of the digging groove, so that the blocking plate can be ensured to completely block the inner side wall of the digging groove; S5, when the space in the existing building is expanded downwards to a designated depth, setting up an inner pouring template in the grooved so that the inner pouring template and a plurality of blocking plates form a pouring cavity with an opening-shaped top; S6, pouring concrete in the pouring cavity so that the liquid level of the concrete is flush with the top surface of the barrier plate; And S7, after the poured concrete is completely solidified and formed, forming a wall surface of an extension space and disassembling the inner building template. Preferably, in step S1, holes are bored in the existing building in advance before the pull screw is installed so that the outer fixing frame and the inner fixing frame can be connected by the pull screw. Preferably, after the step S3, the same reinforcing rod is arranged on the adjacent three blocking plates through the fixing bolts so as to reinforce the p