CN-115977153-B - Prefabricated structure of urban open cut tunnel and construction method

CN115977153BCN 115977153 BCN115977153 BCN 115977153BCN-115977153-B

Abstract

The invention belongs to the technical field of underground structure engineering, and particularly relates to a prefabricated structure of an urban open cut tunnel and a construction method. The prefabricated structure of the urban open cut tunnel comprises prefabricated pile walls, prefabricated tracks and prefabricated units, pile wall connecting grooves extending in the front-rear direction are formed in the opposite wall surfaces of the prefabricated pile walls, the prefabricated tracks are cast on the ground, each prefabricated unit comprises two end prefabricated units and at least two spliced prefabricated units, each end prefabricated unit and each spliced prefabricated unit comprise a base, side walls integrally cast at the left end and the right end of the base, a top wall integrally cast at the top of the side wall and an intermediate wall integrally cast between the top wall and the base, the base is provided with a base connecting groove and a base grouting pipe which are in sliding fit with the prefabricated tracks, the side walls are provided with side wall connecting blocks, side wall grouting pipes and gap grouting pipes which are in sliding fit with the prefabricated pile walls, and the adjacent prefabricated units are in plug connection and are provided with plug grouting pipes. The invention combines the prefabricated structure with cast-in-situ, thereby improving the construction efficiency.

Inventors

GAO YUFEN
CHEN LU
LI JIANAN
SHI XIAOWEI
LI YANG

Assignees

中国建筑第七工程局有限公司

Dates

Publication Date: 20260512
Application Date: 20230106

Claims (9)

1. Prefabricated construction in city open cut tunnel, its characterized in that includes: The prefabricated pile wall is provided with two sides and is arranged in parallel at intervals, the prefabricated pile wall is partially buried in the ground, the length direction of the prefabricated pile wall is defined as the front-back direction, the thickness direction is the left-right direction, and pile wall connecting grooves extending along the front-back direction are formed in the opposite wall surfaces of the two sides of the prefabricated pile wall; the prefabricated track is positioned between the prefabricated side walls on the two sides and poured on the ground, extends along the front-back direction and is provided with at least two paths at intervals along the left-right direction; The prefabricated unit comprises two end prefabricated units and at least two spliced prefabricated units positioned between the two end prefabricated units, wherein the end prefabricated units and the spliced prefabricated units comprise a base, side walls integrally cast at the left end and the right end of the base, a top wall integrally cast at the top of the side walls and an intermediate wall integrally cast between the top wall and the base; the pile wall connecting groove is formed by integrally casting a pile wall connecting groove, the surface of the pile wall connecting groove, which corresponds to the groove side wall and the groove bottom, of the side wall connecting groove is fixedly connected with a side wall grouting pipe extending in the front-rear direction, a plurality of gap grouting pipes extending in the up-down direction and arranged at intervals in the front-rear direction are also arranged on the wall surface of the side wall facing the prefabricated pile wall, the gap grouting pipes are in sliding contact with the wall surface of the prefabricated pile wall, and the adjacent end prefabricated units and the spliced prefabricated units are arranged in the adjacent two spliced prefabricated units; The circumferential directions of the base grouting pipe, the side wall grouting pipe, the gap grouting pipe, the splicing grouting pipe and the splice grouting pipe are respectively provided with a plurality of grout outlets; in the front-rear direction, two adjacent corresponding base grouting pipes and two adjacent corresponding side wall grouting pipes are communicated with each other through connectors; the gap grouting pipe is embedded in the side wall connecting block, the bottom end of the gap grouting pipe is flush with the bottom surface of the base, and the top end of the gap grouting pipe extends out of the top wall.
2. The prefabricated structure of an urban open cut tunnel according to claim 1, wherein each gap grouting pipe on the same side wall connecting block is communicated with a grouting branch pipe, one end of the grouting branch pipe is opened, the other end of the grouting branch pipe is coaxially connected with an insertion pipe, the outer diameter of the insertion pipe is smaller than that of the grouting branch pipe, and the insertion pipe is used for being inserted into the grouting branch pipe on the adjacent side wall connecting block so as to communicate each grouting branch pipe.
3. The prefabricated structure of an open cut tunnel according to claim 1 or 2, wherein the joint grouting pipe and the splicing grouting pipe on the same end prefabricated unit or the same splicing prefabricated unit are communicated with each other.
4. A prefabricated structure of an urban open cut tunnel according to claim 3, characterized in that all end prefabricated units and all splice grouting pipes and splicing grouting pipes in the spliced prefabricated units are mutually communicated.
5. The prefabricated structure of an urban open cut tunnel according to claim 1 or 2, wherein the pipe diameters of the base grouting pipe, the side wall grouting pipe, the gap grouting pipe, the splicing grouting pipe and the joint grouting pipe are all the same.
6. The construction method of the urban open cut tunnel is characterized by comprising the following steps of: firstly, excavating a foundation pit; Constructing two prefabricated pile walls in the foundation pit, and pouring prefabricated tracks between the prefabricated pile walls, wherein pile wall connecting grooves extending along the front-rear direction are formed in the opposite wall surfaces of the two prefabricated pile walls; Step three, prefabricating an end prefabricating unit and an assembling prefabricating unit; the end prefabrication unit and the assembled prefabrication unit comprise a base, side walls integrally cast at the left end and the right end of the base, a top wall integrally cast at the top of the side walls and an intermediate wall integrally cast between the top wall and the base, wherein a base connecting groove in sliding fit with the prefabrication track is formed in the base, and a base grouting pipe extending along the front-rear direction is fixedly connected to the bottom of the base connecting groove and the side wall of the groove; a side wall connecting block which is in sliding fit with the pile wall connecting groove is integrally cast on the side wall, and side wall grouting pipes which extend along the front-rear direction are fixedly connected on the surfaces of the side wall connecting block, which correspond to the groove side wall and the groove bottom of the pile wall connecting groove; the wall surface of the side wall facing the prefabricated pile wall is also provided with a plurality of gap grouting pipes which extend along the up-down direction and are arranged at intervals along the front-back direction, a plurality of splice grouting pipes which extend along the up-down direction are arranged between the splicing gaps of two adjacent prefabricated units, wherein one prefabricated unit is provided with an integrally poured splicing block, the other prefabricated unit is provided with a splicing groove matched with the splicing block, the surfaces of the splicing blocks, which correspond to the groove side wall and the groove bottom of the splicing groove, are fixedly connected with the splicing grouting pipes; Hoisting the end prefabrication unit and the assembled prefabrication unit to the prefabrication track by using hoisting equipment, horizontally pushing the end prefabrication unit and the assembled prefabrication unit to a construction position by using power equipment, and completing the assembly between the end prefabrication unit and the assembled prefabrication unit and the prefabrication pile wall; And fifthly, grouting is carried out in each base grouting pipe, each side wall grouting pipe, each gap grouting pipe, each splicing grouting pipe and each splicing grouting pipe, slurry flows out from slurry outlets on each grouting pipe, gaps between the end prefabricated units and the prefabricated pile wall, gaps between the end prefabricated units and adjacent spliced prefabricated units, gaps between the adjacent two spliced prefabricated units and gaps between each end prefabricated unit, each spliced prefabricated unit and the prefabricated track are filled.
7. The construction method of an open cut tunnel according to claim 6, wherein in the third step, each slit grouting pipe on the same prefabricated unit is connected in advance through a grouting branch pipe when the prefabricated end unit is prefabricated and the prefabricated unit is assembled, and an insertion pipe is arranged at one end of the grouting branch pipe, and in the fourth step, the insertion pipe is inserted into the grouting branch pipe on the adjacent side wall connecting block when the prefabricated end unit is assembled, and the operation is repeated to connect all the grouting branch pipes.
8. The construction method of the urban open cut tunnel according to claim 7, wherein the gap grouting pipes, the splicing grouting pipes and the splice grouting pipes extend out of the top wall, and in the fifth step, before the concrete slurry is poured, the splicing grouting pipes and the splice grouting pipes are communicated with each other, and the base grouting pipes are communicated with each other.
9. The construction method of an urban open cut tunnel according to any one of claims 6 to 8, wherein the pipe diameters of the base grouting pipe, the side wall grouting pipe, the gap grouting pipe, the plug grouting pipe and the joint grouting pipe are all the same.

Description

Prefabricated structure of urban open cut tunnel and construction method Technical Field The invention relates to the technical field of underground structure engineering, in particular to a prefabricated structure of an urban open cut tunnel and a construction method. Background Tunnels are buildings built underground or under water or in mountains, paved with railways or built roads for the passage of motor vehicles, or passages for the transportation of fuel (natural gas, oil, etc.). In recent years, the construction of tunnels under the main roads of large urban centers to solve the problem of traffic congestion has become a conventional solution for urban development, economic growth and traffic escape. The current tunnel excavation method comprises an open excavation method, a shallow buried and buried excavation method, a shield method and the like, but most of tunnel construction still stays on the traditional open excavation cast-in-place construction method due to the restriction of surrounding environment and traffic functions. The traditional open-cut tunnel is a construction method which sequentially excavates layers and segments from the ground downwards until the size and the elevation required by the bottom structure of the tunnel are reached, then auxiliary structure operations such as tunnel main body structure construction, waterproof heat preservation and the like are carried out in a foundation pit, and finally backfilling is carried out. After the construction of the foundation pit excavation and the supporting (supporting) structure is completed, the tunnel main body structure is cast from the bottom of the foundation pit in a segmented and layered mode or prefabricated components are adopted, and then the supporting structure in the foundation pit is removed, and the process is repeated in a circulating mode until the tunnel top structure is formed. The open cut tunnel construction method needs a series of working procedures such as foundation pit excavation, reinforcement binding, template manufacturing, concrete pouring, maintenance, backfilling and covering. From the whole construction process, the process is complex, the construction period is long, the interference to the surrounding environment is large, the time is long, the loss of manpower, materials and machinery is large, and the cost-effectiveness ratio is seriously compressed. In addition, the construction method is greatly influenced by the environments and conditions such as rain, haze and air temperature, and the construction quality and the construction period are difficult to control. Disclosure of Invention In view of the above, the invention aims to provide a prefabricated structure of an urban open cut tunnel and a construction method thereof, so as to solve the technical problems of long construction period and complex construction procedures of the existing open cut tunnel construction method. In order to achieve the purpose, the technical scheme adopted by the prefabricated structure of the urban open cut tunnel is as follows: prefabricated structure of city open cut tunnel includes: The prefabricated pile wall is provided with two sides and is arranged in parallel at intervals, the prefabricated pile wall is partially buried in the ground, the length direction of the prefabricated pile wall is defined as the front-back direction, the thickness direction is the left-right direction, and pile wall connecting grooves extending along the front-back direction are formed in the opposite wall surfaces of the two sides of the prefabricated pile wall; the prefabricated track is positioned between the prefabricated side walls on the two sides and poured on the ground, extends along the front-back direction and is provided with at least two paths at intervals along the left-right direction; The prefabricated unit comprises two end prefabricated units and at least two spliced prefabricated units positioned between the two end prefabricated units, wherein the end prefabricated units and the spliced prefabricated units comprise a base, side walls integrally cast at the left end and the right end of the base, a top wall integrally cast at the top of the side walls and an intermediate wall integrally cast between the top wall and the base; the pile wall connecting groove is formed by integrally casting a pile wall connecting groove, the surface of the pile wall connecting groove, which corresponds to the groove side wall and the groove bottom, of the side wall connecting groove is fixedly connected with a side wall grouting pipe extending in the front-rear direction, a plurality of gap grouting pipes extending in the up-down direction and arranged at intervals in the front-rear direction are also arranged on the wall surface of the side wall facing the prefabricated pile wall, the gap grouting pipes are in sliding contact with the wall surface of the prefabricated pile wall, and the adjacent end prefabricated units and the s