Assembly type tunnel cover arch capable of being assembled and disassembled

Abstract

The utility model relates to the technical field of tunnel engineering construction equipment, and discloses an assembly type tunnel cover arch capable of being assembled and disassembled in order to solve the problems that in the prior art, a tunnel cover arch is low in construction efficiency, cannot be repeatedly used and is poor in adaptability. Comprising a cover arch inner ring and a cover arch outer ring which are formed by connecting a plurality of prefabricated concrete sections through arc-shaped bolts, the cover arch inner ring is fixedly installed on a hole foundation and reserved core soil, and the area exceeding the reserved core soil is supported through a steel pipe support; the sleeve arch outer ring is fixedly installed on the outer side of a pipe shed, a filling cavity is formed between the sleeve arch outer ring and the sleeve arch inner ring, the sleeve arch outer ring and the sleeve arch inner ring are connected through a connecting assembly, the connecting assembly comprises arc-shaped bolts and locking nuts, and adjacent sleeve arch inner ring sections and sleeve arch outer ring sections are fixedly connected through the arc-shaped bolts. The filling cavity between the cover arch inner ring and the cover arch outer ring is filled with concrete sprayed on site, and an overall stress structure is formed. Through modular prefabrication segmented installation and disassembly, bearing can be carried earlier after installation, and installation is safer.

Description

TECHNICAL FIELD

[0001] The utility model relates to tunnel engineering construction equipment technical field especially relates to a kind of assembly type tunnel sleeve arch of can be installed and dismantled. BACKGROUND

[0002] Tunnel sleeve arch usually adopts composite lining, sleeve arch plays a guiding role, also plays the role of positioning large pipe shed.In actual construction in the field, temporary support needs to be set up, steel arch is installed, formwork is installed, and concrete is poured, which is low in efficiency, and open cut tunnel itself can disperse and relieve surface pressure, protect the soil around the tunnel entrance from erosion and collapse, and the sleeve arch plays a small role in the later period.In tunnel construction, sleeve arch, as a key component of composite lining, plays an important role in guiding large pipe shed, dispersing surface pressure and protecting the soil around the tunnel entrance.Currently, the sleeve arch construction in the prior art has the following defects:

[0003] Low construction efficiency: temporary support needs to be set up on site, steel arch needs to be installed and the whole concrete needs to be poured, and the single construction cycle is as long as 7-10 days.

[0004] Not reusable: the whole poured sleeve arch cannot be dismantled and reused after completing the stage task, and the material is wasted seriously.

[0005] Poor adaptability: the existing sleeve arch is designed with fixed size, which is difficult to adapt to different tunnel spans (such as 8-15 meters), and multiple sets of formwork need to be customized, which is high in cost.

[0006] Insufficient structural strength: the traditional sleeve arch relies on steel reinforcement, but the node connection is weak and the shear capacity is poor (the measured shear strength is less than 10 MPa), which easily leads to local cracking.

[0007] The existing technology relies on a complex formwork system, which is time-consuming to disassemble and adjust the size. UTILITY MODEL CONTENTS

[0008] The utility model aims to provide a kind of assembly type tunnel sleeve arch of can be installed and dismantled to solve the problems of low construction efficiency, non-reusable and poor adaptability of the existing technology tunnel sleeve arch.

[0009] To achieve the above-mentioned purpose, the specific technical scheme of a kind of assembly type tunnel sleeve arch of can be installed and dismantled of the utility model is as follows:

[0010] The detachable assembly type tunnel sleeve arch comprises a sleeve inner ring and a sleeve outer ring which are composed of a plurality of prefabricated concrete segments and are connected through arc-shaped bolts, the sleeve inner ring is fixedly installed on a hole opening foundation and a reserved core soil and is supported by a steel pipe support beyond the reserved core soil area, the sleeve outer ring is fixedly installed outside a pipe shed and forms a filling cavity with the sleeve inner ring, the sleeve outer ring and the sleeve inner ring are connected through a connecting assembly, the connecting assembly comprises arc-shaped bolts and locking nuts, and adjacent sleeve inner ring segments and sleeve outer ring segments are fixedly connected through the arc-shaped bolts, and the filling cavity between the sleeve inner ring and the sleeve outer ring is filled with on-site sprayed concrete to form an integral stress structure.

[0011] Further, the longitudinal and transverse dimensions of the prefabricated concrete segments can be adjusted to adapt to different span tunnels.

[0012] Further, the distance between the adjacent sleeve rings fixedly connected through the arc-shaped bolts is 1.0 m.

[0013] Further, the prefabricated concrete segments of the sleeve inner ring and the sleeve outer ring are pre-buried with a steel reinforcement cage.

[0014] Further, the steel pipe support is a detachable truss structure, and a quick buckle is arranged at a support node.

[0015] Further, the pipe shed is a steel pipe with a diameter of 108 mm and a wall thickness of 6 mm.

[0016] Further, the steel pipe is a hot-rolled seamless steel pipe.

[0017] Further, the sleeve outer ring is uniformly provided with lifting rings.

[0018] The detachable assembly type tunnel sleeve arch has the following advantages:

[0019] 1. Construction efficiency is improved: modular prefabricated segments are installed, and the installation can be loaded earlier and is safer.

[0020] 2. Easy to assemble and disassemble: the detachable assembly makes the sleeve arch reusable, and no special tools are needed, and a conventional light crane and a few wrenches can be used to assemble and disassemble, and the material cost is low.

[0021] 3. The structural strength is enhanced: the steel reinforcement cage and the sprayed concrete work together to improve the shear strength.

[0022] 4. Span self-adaptation: the segmented size adjustment function adapts to different tunnel spans and reduces the need for customization. DRAWINGS

[0023] Figure 1 The device overall structure diagram provided by the utility model Figure One;

[0024] Figure 2 The device overall structure schematic diagram provided by the utility model Figure Two ;

[0025] Figure 3 The device overall structure schematic diagram provided by the utility model Figure Three .

[0026] In the figure: 1, the sleeve arch outer ring; 2, the sleeve arch inner ring; 3, the filling cavity; 4, the pipe shed; 5, the arc bolt; 6, the lifting ring. DETAILED DESCRIPTION

[0027] In order to make the utility model purposes, technical scheme and advantages more clear and obvious, the following is combined with the drawings and examples, and the utility model is further described in detail.It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0028] Referring to Figures 1-3 The utility model provides a kind of detachable assembly tunnel sleeve arch, it is applicable to mountain tunnel, city underground engineering etc. and needs temporary support and guiding structure Construction scene. Including by multiple prefabricated concrete section through arc bolt 5 connection and form sleeve arch inner ring 2 and sleeve arch outer ring 1. Sleeve arch inner ring 2 is connected by multiple prefabricated concrete section through arc bolt 5, sectional longitudinal and transverse dimension can be adjusted;Sleeve arch inner ring 2 is fixed in hole basis and reserved core soil, as the load-bearing main body of sleeve arch;Exceeding reserved core soil area is supported by detachable steel pipe support, and load is dispersed to stable stratum. Sleeve arch outer ring 1 is connected by multiple prefabricated concrete section through arc bolt 5, is fixed in pipe shed 4 outer side, and pipe shed 4 is hot-rolled seamless steel pipe of diameter 108mm, wall thickness 6mm. Sleeve arch outer ring 1 and sleeve arch inner ring 2 form certain interval filling cavity 3, for accommodating shotcrete;Through arc bolt 5 and pipe shed 4 fixed, provide guiding effect and constrain pipe shed 4 displacement. Filling layer includes arc bolt 5 and locking nut, and adjacent sleeve arch section is fixedly connected with 1.0m interval. Ensure that sleeve arch inner ring 2 and outer ring are stressed in cooperation, prevent joint cracking, and filling layer and sleeve arch inner and outer ring form integral force structure, can strengthen rib net and constrain concrete shrinkage crack, and improve shear strength.

[0029] In construction, sleeve arch inner ring 2 first needs to be fixedly installed on hole basis and reserved core soil, and is supported by steel pipe support beyond reserved core soil area, adjusts longitudinal dimension to design value, is connected with 1.0m interval through arc bolt 5;Subsequently install pipe shed 4 on sleeve arch inner ring 2, and install sleeve arch outer ring 1 from pipe shed 4, subsequently fix support and pipe shed 4, and adjacent sleeve ring unit is fixedly connected through filling area arc bolt 5, with 1.0m interval;Sleeve arch inner and outer rings adopt on-site shotcrete construction technology.

[0030] In the dismantling, through the crane hangs the lifting ring 6, and then through the wrench to unscrew the fastening bolt of each part, the outer ring 1 of the sleeve arch can be disassembled.

[0031] The utility model has the following advantages compared with the prior art:

[0032] ①The device is simple in material combination, and has low requirements for materials, and can be made of steel bars and concrete without profiled steel, and can be made by ordinary workers in the construction area;

[0033] ②The on-site installation and disassembly are convenient, and special tools are not required, and a conventional light crane and a few wrenches can be used for installation and disassembly;

[0034] ③The tunnel portal can be excavated in sections, and the sleeve ring can be installed in sections, and can bear earlier after installation, and the construction is safer;

[0035] ④It is suitable for all tunnels, and the longitudinal and transverse dimensions of the sleeve ring precast block are adjusted according to different span tunnels and different length sleeve arches;

[0036] ⑤The assembly type construction is fast, reusable, efficient and cost-saving.

[0037] In summary, the utility model innovatively constructs a composite support system composed of a sleeve arch inner ring 2, a sleeve arch outer ring 1 and a filling cavity 3 through modular prefabrication and assembly type construction technology. The sleeve arch adopts a prefabricated concrete sectional connection technology with arc-shaped bolts 5, and the sleeve arch inner ring 2 and the sleeve arch outer ring 1 are rigidly connected through arc-shaped bolts 5 with a spacing of 1.0 m, and the filling cavity 3 is filled with sprayed concrete to form an integral force structure, effectively improving the shear strength. The industry pain points such as long construction period, serious resource waste and poor adaptability of the traditional sleeve arch are successfully solved, and a more convenient and efficient construction structure is provided for tunnel engineering under complex geological conditions.

[0038] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A demountable fabricated tunnel lining comprising, The application relates to a tunnel lining structure, which comprises a lining inner ring (2) and a lining outer ring (1) formed by connecting a plurality of prefabricated concrete segments through arc-shaped bolts (5), the lining inner ring (2) is fixedly installed on a hole opening foundation and reserved core soil and is supported by a steel pipe support beyond the reserved core soil area; the lining outer ring (1) is fixedly installed on the outside of a pipe shed (4) and forms a filling cavity (3) with the lining inner ring (2); the lining outer ring (1) and the lining inner ring (2) are connected through a connecting assembly, the connecting assembly comprises arc-shaped bolts (5) and locking nuts, and adjacent lining inner ring (2) segments and lining outer ring (1) segments are fixedly connected through the arc-shaped bolts (5); the filling cavity (3) between the lining inner ring (2) and the lining outer ring (1) is filled with on-site sprayed concrete to form an integral stress structure.

2. The demountable fabricated tunnel liner of claim 1, wherein, The longitudinal and transverse dimensions of the prefabricated concrete segments can be adjusted to adapt to different span tunnels.

3. The demountable fabricated tunnel liner of claim 1, wherein, The spacing between adjacent lining rings fixedly connected through the arc-shaped bolts (5) is 1.0 m.

4. The demountable assembled tunnel liner of claim 1, wherein, The prefabricated concrete segments of the lining inner ring (2) and the lining outer ring (1) are internally embedded with steel reinforcement frameworks.

5. The demountable assembled tunnel liner of claim 1, wherein, The steel pipe support is a detachable truss structure, and a quick buckle is arranged at a support node.

6. The demountable assembled tunnel liner of claim 1, wherein, The pipe shed (4) is a steel pipe with a diameter of 108 mm and a wall thickness of 6 mm.

7. The demountable assembled tunnel liner of claim 2, wherein, The steel pipe is a hot-rolled seamless steel pipe.

8. The demountable assembled tunnel liner of claim 1, wherein, Uniform lifting rings (6) are arranged on the lining outer ring (1).

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