CN114809070A - Open-cut tunnel assembly integral structure and construction method thereof - Google Patents

Open-cut tunnel assembly integral structure and construction method thereof Download PDF

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Publication number
CN114809070A
CN114809070A CN202210185271.3A CN202210185271A CN114809070A CN 114809070 A CN114809070 A CN 114809070A CN 202210185271 A CN202210185271 A CN 202210185271A CN 114809070 A CN114809070 A CN 114809070A
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CN
China
Prior art keywords
bottom plate
side wall
steel bars
cast
main body
Prior art date
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Pending
Application number
CN202210185271.3A
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Chinese (zh)
Inventor
姜弘
刘涛
王文渊
陈鼐基
宗军良
缪仑
陈方
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Huangpu River Yuejiang Facilities Investment Construction Development Co ltd
Shanghai Urban Construction Design Research Institute Group Co Ltd
Original Assignee
Shanghai Huangpu River Yuejiang Facilities Investment Construction Development Co ltd
Shanghai Urban Construction Design Research Institute Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Huangpu River Yuejiang Facilities Investment Construction Development Co ltd, Shanghai Urban Construction Design Research Institute Group Co Ltd filed Critical Shanghai Huangpu River Yuejiang Facilities Investment Construction Development Co ltd
Priority to CN202210185271.3A priority Critical patent/CN114809070A/en
Publication of CN114809070A publication Critical patent/CN114809070A/en
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/18—Making embankments, e.g. dikes, dams
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/16—Arrangement or construction of joints in foundation structures
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
    • E02D31/025—Draining membranes, sheets or fabric specially adapted therefor, e.g. with dimples

Abstract

The invention discloses an open cut tunnel assembly integral structure and a construction method thereof, wherein the open cut tunnel assembly integral structure comprises a bottom plate, side walls and a top plate; the bottom plate comprises a bottom plate main body and a bottom plate side wall connector; each side wall and the top plate comprise a precast slab facing the inner side of the tunnel and a cast-in-place layer facing the outer side of the tunnel; the reinforcing steel bars of each cast-in-place layer and the reinforcing steel bars of the corresponding precast slabs are of an integral structure, and the corresponding precast slabs are prefabricated at the same time; the steel bars of the precast slabs of each side wall extend into the corresponding joints between the bottom plate side walls and the top plate for anchoring; the reinforcing steel bars of the cast-in-place layer of each side wall are in lap joint with the reinforcing steel bars of the bottom plate main body and the reinforcing steel bars of the cast-in-place layer of the top plate. During construction, the bottom plate main body is poured firstly, then the side walls and the top plate are hoisted and prefabricated, and after anchoring and lapping of the reinforcing steel bars are completed, all joints between the cast-in-place layer and the bottom plate side walls are poured for the second time. The invention solves the problems of low construction mechanization degree, complex construction procedures, high construction precision requirement and the like in the prior art.

Description

Open-cut tunnel assembly integral structure and construction method thereof
Technical Field
The invention relates to the technical field of underground engineering, in particular to an open cut tunnel assembly integral structure and a construction method thereof.
Background
In recent years, in large and ultra-large urban centers, a method for constructing tunnels under main roads to solve the problem of traffic congestion has become an unfortunate choice for urban development, economic growth and traffic escape, and most of the construction of the tunnels still remains on the traditional open-cut cast-in-place construction method.
In the prior art, the above engineering generally needs a series of processes such as building envelope construction, foundation pit excavation, reinforcement bar binding, template manufacturing, concrete pouring and maintenance, backfill covering, road restoration and the like.
From the whole construction process, the prior art has complex processes, long construction period, large manpower, material and mechanical loss, large influence by environment and conditions such as rainfall, haze, air temperature and the like, and difficult control of construction quality and construction period.
Therefore, how to solve the problems of low construction mechanization degree, complex construction process, high construction precision requirement and the like of the existing assembly type underground structure system becomes a technical problem which needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of the defects in the prior art, the invention provides an open cut tunnel assembly integral structure and a construction method thereof, and aims to solve the problems of low mechanization degree, complex construction process, high construction precision requirement and the like of the existing assembly type underground structure system.
In order to achieve the purpose, the invention discloses an open cut tunnel assembly integral structure which comprises a bottom plate, side walls and a top plate.
The bottom plate comprises a bottom plate main body and bottom plate side wall connectors which are positioned on two sides of the bottom plate main body and connected with the two side walls respectively;
a steel plate water stop belt and a cement-based capillary crystalline waterproof coating are arranged between each joint between the side walls of the bottom plate and the bottom plate main body;
each side wall and the top plate respectively comprise a precast slab facing the inner side of the tunnel and a cast-in-place layer facing the outer side of the tunnel;
the reinforcing steel bars of each cast-in-place layer and the reinforcing steel bars of the corresponding precast slabs are of an integral structure, and the precast slabs are prefabricated simultaneously;
the steel bars of the precast slabs of each side wall comprise ribbed steel bars which extend into corresponding joints between the bottom plate and the side wall, and the top plate is anchored;
the steel bars of the cast-in-place layer of each side wall comprise ribbed steel bars, steel bars of the bottom plate main body and steel bars of the cast-in-place layer of the top plate in an overlapping mode.
Preferably, corner reinforcing ribs are arranged on the outer sides of the top plate and each side wall which are connected to form a 90-degree included angle.
Preferably, a prefabricated reinforcement cage is arranged in the bottom plate main body.
Preferably, the structure of each cast-in-place layer and the corresponding precast slab is a precast slab type corresponding to the steel bar truss on the outer side of the tunnel and additionally corresponding to the inner side of the tunnel.
Preferably, the steel bars of the precast slabs of each side wall comprise lengths of the ribbed steel bars anchored into the corresponding joints between the bottom plate and the side wall, and lengths of the ribbed steel bars anchored into the top plate are not less than 12d, and d is the diameter of the anchored steel bars.
Preferably, the steel bars of the cast-in-place layer of each side wall comprise ribbed steel bars and steel bars of the bottom plate main body, the length of the lap joint of the steel bars of the cast-in-place layer of the top plate is not less than 1.7labE, and the labE is the basic anchoring length under the working condition of steel bar earthquake resistance.
The invention also provides a construction method of the open trench tunnel assembly monolithic structure, which comprises the following steps:
step 1, hoisting the steel reinforcement framework of the bottom plate in place, connecting the steel reinforcement framework with a prefabricated steel reinforcement cage of the bottom plate main body, and reserving the steel plate water stop belts between joints of the steel reinforcement framework and each side wall of the bottom plate;
step 2, pouring the bottom plate main body, and reserving a construction joint of a joint between the side walls of each bottom plate;
step 3, after the strength of the bottom plate main body reaches 100%, dismantling steel supports which conflict with the positions of the side walls, and then hoisting each prefabricated side wall and the top plate in place;
step 4, after each prefabricated side wall and the top plate are effectively supported, secondary pouring is carried out, and the cast-in-place layer of each side wall and the cast-in-place layer of the top plate are poured;
and 5, backfilling and covering soil after the design strength is reached, and removing the temporary support.
Preferably, before each side wall is hoisted, roughening treatment is carried out on each construction joint, and the cement-based capillary crystalline waterproof coating and the water stop glue are applied.
The invention has the beneficial effects that:
the invention comprehensively considers the reasonability of structural stress and the convenience of prefabrication and assembly, solves the problems of low construction mechanization degree, complicated construction procedures, high construction precision requirement and the like of the existing assembled underground structure system, is convenient to construct, can ensure the quality of the whole structure, can shorten the construction period and can reduce the field labor force.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 shows a schematic cross-sectional structure of an embodiment of the present invention.
Fig. 2 is a partially enlarged schematic view illustrating a joint portion between side walls of a base plate according to an embodiment of the present invention.
Fig. 3 is a partially enlarged schematic view illustrating a position where a top plate and a sidewall are connected to form a 90-degree included angle in an embodiment of the present invention.
Detailed Description
Examples
As shown in fig. 1 and 2, the open trench tunnel is assembled with an integral structure, which includes a bottom plate, side walls and a top plate.
The bottom plate comprises a bottom plate main body 1 and bottom plate side wall connectors 2 which are positioned on two sides of the bottom plate main body 1 and are respectively connected with two side walls;
a steel plate water stop belt and a cement-based capillary crystalline waterproof coating are arranged between each bottom plate side wall inter-joint 2 and the bottom plate main body 1;
each side wall and the top plate comprise a precast slab 3 facing the inner side of the tunnel and a cast-in-place layer 4 facing the outer side of the tunnel;
the reinforcing steel bars of each cast-in-place layer 4 and the reinforcing steel bars of the corresponding precast slabs 3 are of an integral structure, and the precast slabs 3 are prefabricated simultaneously;
the steel bars of the precast slabs 3 of each side wall comprise ribbed steel bars which extend into the corresponding joints 2 between the bottom plate side walls and a top plate for anchoring;
the reinforcing steel bars of the cast-in-situ layer 4 of each side wall comprise ribbed reinforcing steel bars, the reinforcing steel bars of the bottom plate main body 1 and the reinforcing steel bars of the cast-in-situ layer 4 of the top plate in an overlapping mode.
In practical application, the steel bars of the cast-in-place layer 4 are simultaneously manufactured when the corresponding prefabricated plates 3 are prefabricated, and the steel bars and the corresponding prefabricated plates 3 are of an integral structure, so that the steel bar binding operation on site can be greatly reduced.
The principle of the invention is as follows:
the assembled integral structure refers to an integral structure formed by connecting precast concrete components or parts through reinforcing steel bars and connecting pieces and pouring concrete in situ.
The structure has the advantages of excellent anti-seismic performance, higher overall rigidity, convenience in construction, material saving, reduction in construction period and the like, and the defects of a cast-in-place concrete structure and an assembled concrete structure are overcome.
The invention provides an integral system and a detail structure of an assembled integral structure based on structural stress rationality and prefabrication and assembly convenience, absorbs the advantages of the integral system and the detail structure, better accords with the development direction of 'modernization and green buildings' of building industry, can ensure the reliability and applicability of the technology, finally ensures that the technology can be guided and quickly applied to the field of industrialized construction of open-cut tunnels, is beneficial to quickly popularizing the technology, and solves the problems of low construction mechanization degree, complicated construction procedures, high construction precision requirement and the like of the existing assembled underground structure system.
In some embodiments, as shown in fig. 3, corner reinforcing ribs 5 are provided on the outer sides of the 90-degree included angle formed by the connection between the top plate and each side wall.
In some embodiments, a prefabricated reinforcement cage is provided in the bottom plate body 1.
In some embodiments, each cast-in-place layer 4 and corresponding prefabricated slab 3 is constructed in a form of a steel bar truss attached to the outer side of the corresponding tunnel and prefabricated slabs attached to the inner side of the corresponding tunnel.
In some embodiments, the steel bars of the prefabricated panels 3 of each side wall comprise the length of the ribbed steel bars anchored into the corresponding bottom-plate side-wall joints 2, and the length of the ribbed steel bars anchored into the top plate is not less than 12d, wherein d is the diameter of the anchored steel bars.
In some embodiments, the length of the lap joint of the steel bars of the cast-in-place layer 4 of each side wall, including the steel bars of the ribbed steel bars and the bottom plate main body 1, and the steel bars of the cast-in-place layer 4 of the top plate is not less than 1.7labE, and labE is the basic anchoring length under the working condition of steel bar earthquake resistance.
The invention also provides a construction method of the open trench tunnel assembly monolithic structure, which comprises the following steps:
step 1, hoisting a steel reinforcement framework of a bottom plate in place, connecting the steel reinforcement framework with a prefabricated steel reinforcement cage of a bottom plate main body 1, and reserving a steel plate water stop between each steel reinforcement cage and a joint 2 between each side wall of the bottom plate;
step 2, pouring the bottom plate main body 1, and reserving a construction joint of the joint 2 between the side walls of each bottom plate;
step 3, after the strength of the bottom plate main body 1 reaches 100%, removing steel supports conflicting with any side wall, and then hoisting each prefabricated side wall and the top plate in place;
step 4, after each prefabricated side wall and top plate are effectively supported, secondary pouring is carried out, and a cast-in-place layer 4 of each side wall and top plate is poured;
and 5, backfilling and covering soil after the design strength is reached, and removing the temporary support.
In some embodiments, each construction joint is roughened and a cement-based permeable crystalline waterproofing paint and a water-stopping adhesive are applied before each side wall is hoisted.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (8)

1. The open cut tunnel assembly integral structure comprises a bottom plate, side walls and a top plate; the method is characterized in that: the bottom plate comprises a bottom plate main body (1) and bottom plate side wall connectors (2) which are positioned on two sides of the bottom plate main body (1) and connected with the two side walls respectively;
a steel plate water stop belt and a cement-based capillary crystalline waterproof coating are arranged between each bottom plate side wall connector (2) and the bottom plate main body (1);
each side wall and the top plate comprise a precast slab (3) facing the inner side of the tunnel and a cast-in-place layer (4) facing the outer side of the tunnel;
the reinforcing steel bars of each cast-in-place layer (4) and the corresponding reinforcing steel bars of the precast slabs (3) are of an integral structure, and the precast slabs (3) are prefabricated while the corresponding precast slabs (3) are manufactured;
the steel bars of the precast slabs (3) of each side wall comprise ribbed steel bars which extend into the corresponding joints (2) between the bottom plate and the side wall, and the top plate is anchored;
the reinforcing steel bars of the cast-in-place layer (4) of each side wall comprise ribbed reinforcing steel bars, and the reinforcing steel bars of the bottom plate main body (1) and the cast-in-place layer (4) of the top plate are in lap joint.
2. The open-cut tunnel assembly monolithic structure according to claim 1, wherein corner reinforcing ribs (5) are arranged on the outer sides of the top plate and each side wall which are connected to form a 90-degree included angle.
3. The open-cut tunnel assembly monolithic structure according to claim 1, wherein a prefabricated reinforcement cage is arranged in the bottom plate main body (1).
4. The assembled monolithic structure for open-cut tunnels according to claim 1, wherein each cast-in-place layer (4) and the corresponding prefabricated slab (3) are in the form of a steel bar truss corresponding to the outer side of the tunnel and a prefabricated slab corresponding to the inner side of the tunnel.
5. The open-cut tunnel assembly integrated structure of claim 1, wherein the reinforcing bars of the precast slabs (3) of each of the side walls include a length of the ribbed reinforcing bars anchored into the corresponding floor-side wall joints (2) and a length of the top slab not less than 12d, d being a diameter of the anchored reinforcing bars.
6. The open-cut tunnel assembly monolithic structure of claim 1, wherein the reinforcing steel bars of the cast-in-place layer (4) of each side wall comprise ribbed reinforcing steel bars and reinforcing steel bars of the bottom plate main body (1), and the length of the lap joint of the reinforcing steel bars of the cast-in-place layer (4) of the top plate is not less than 1.7labE, and the labE is the basic anchoring length under the working condition of reinforcing steel bar earthquake resistance.
7. The construction method of the open trench tunnel assembled monolithic structure according to claim 1, comprising the steps of:
step 1, hoisting the steel reinforcement framework of the bottom plate in place, connecting the steel reinforcement framework with a prefabricated reinforcement cage of the bottom plate main body (1), and reserving the steel plate water stop belts between the steel reinforcement framework and each joint (2) between the side walls of the bottom plate;
step 2, pouring the bottom plate main body (1), and reserving a construction joint of each joint (2) between the side walls of the bottom plate;
step 3, after the strength of the bottom plate main body (1) reaches 100%, removing steel supports which conflict with the position of any side wall, and then hoisting each prefabricated side wall and the top plate in place;
step 4, after each prefabricated side wall and the top plate are effectively supported, secondary pouring is carried out, and the cast-in-place layer (4) of each side wall and the top plate is poured;
and 5, backfilling and covering soil after the design strength is reached, and removing the temporary support.
8. The construction method of the assembled monolithic structure for the open-cut tunnel according to claim 7, wherein before each side wall is hoisted, each construction joint is roughened, and the cement-based permeable crystalline waterproof coating and the water-stop glue are applied.
CN202210185271.3A 2022-02-28 2022-02-28 Open-cut tunnel assembly integral structure and construction method thereof Pending CN114809070A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210185271.3A CN114809070A (en) 2022-02-28 2022-02-28 Open-cut tunnel assembly integral structure and construction method thereof

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Application Number Priority Date Filing Date Title
CN202210185271.3A CN114809070A (en) 2022-02-28 2022-02-28 Open-cut tunnel assembly integral structure and construction method thereof

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CN114809070A true CN114809070A (en) 2022-07-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115182385A (en) * 2022-08-03 2022-10-14 上海市城市建设设计研究总院（集团）有限公司 Prefabricated assembly structure of integral open-cut tunnel and assembly construction method thereof
CN115217149A (en) * 2022-08-15 2022-10-21 上海市城市建设设计研究总院（集团）有限公司 Prefabricated and cast-in-place combined open-cut tunnel box culvert structure and tunnel construction method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115182385A (en) * 2022-08-03 2022-10-14 上海市城市建设设计研究总院（集团）有限公司 Prefabricated assembly structure of integral open-cut tunnel and assembly construction method thereof
CN115217149A (en) * 2022-08-15 2022-10-21 上海市城市建设设计研究总院（集团）有限公司 Prefabricated and cast-in-place combined open-cut tunnel box culvert structure and tunnel construction method

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