CN111456759A - A prefabricated tunnel lining structure - Google Patents

Abstract

A prefabricated tunnel lining structure can effectively ensure the quality of the arch lining while improving the industrialization degree and construction efficiency of the mine method tunnel construction, overcome the quality defects of the lining arch due to the difficulty of on-site pouring control, and ensure the smooth operation of the tunnel. Safety, reduce investment in remediation during operation. It includes the initial support structure, the waterproof and drainage system and the secondary lining structure set from the inside to the outside. The secondary lining structure includes the inverted arch, the secondary lining of the side wall and the secondary lining of the arch. Both ends of the inverted arch are consolidated with the bottom end of the secondary lining of the side wall, and are formed by continuous pouring in sections along the extending direction of the tunnel. The secondary lining of the arch is a prefabricated structure, which is composed of reinforced concrete prefabricated block units longitudinally assembled, and its circumferential ends and the secondary lining of the side wall on the same side are lapped through the connecting structure, or formed by connecting components and post-casting joints. Fixed connection.

Description

A prefabricated tunnel lining structure

technical field

The invention relates to a tunnel lining structure, in particular to a prefabricated tunnel lining structure in which the arch portion is prefabricated.

Background technique

In recent years, my country's railway construction has developed rapidly, especially the construction of high-speed railway has entered a stage of explosive growth. With the rapid growth of railway operation mileage and the increase of tunnel-to-line ratio brought about by the improvement of line standards, the number and scale of railway tunnels also show a trend of rapid growth, especially in the southwestern mountainous area, where tunnels play an important role in railway infrastructure projects. The proportion is very high.

At present, during the construction of mining tunnels, due to various quality of craftsmanship and other factors, some sections have initial support or void behind the lining, insufficient thickness of the secondary lining, cracks, water leakage, staggered construction joints, uneven or insufficient concrete strength Such quality defects are particularly prominent in the tunnel arch, which brings great hidden dangers to the safety of railway operation. In recent years, a number of high-speed railways that have been opened have suffered from several diseases caused by the quality defects of the tunnel lining during the operation period, resulting in slow-speed operation or even line interruption accidents, which have attracted great attention from all parties and invested huge manpower and material resources. remediation.

The tunnel lining constructed by the traditional mining method generally adopts a cast-in-place structure with curved walls and inverted arches. During construction, the inverted arch is usually first bound with steel bars and poured into concrete. When the inverted arch is poured, the side walls are reserved for connecting the steel bars. The wall and the arch are bound with steel bars and concrete is poured as a whole, and the side wall foot is connected with the inverted arch through the stubbing steel bars on both sides of the inverted arch to form a whole. Therefore, the entire lining is cast and formed on site. The biggest defect of traditional tunnel lining construction is that: since the lining is integrally poured on site, the pouring process is very important to the quality of the lining. However, in actual construction, due to the insufficient binding of structural steel bars, the construction process problems such as mold entry, vibration and concrete pouring are difficult. , it is easy to cause the concrete lining to have honeycomb, pockmarked surface, insufficient thickness, poor pouring and vibrating, etc., resulting in cracking or even peeling off of the lining during operation, which greatly threatens the safety of line driving. The location of the department is particularly serious, and the threat to the driving safety is also the greatest.

Therefore, it is an urgent need for tunnel construction to optimize the tunnel lining structure constructed by the traditional mining method, fundamentally solve the quality defect of the tunnel lining arch, improve the quality of the tunnel project, and fully ensure the driving safety in the tunnel.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a prefabricated tunnel lining structure, which can effectively ensure the quality of the arch lining while improving the industrialization degree and construction efficiency of the mining method tunnel construction, and overcome the lining caused by the difficulty of on-site pouring control. The quality defect of the arch can ensure the safety of tunnel operation and reduce the investment in renovation during the operation period.

The technical scheme adopted by the present invention to solve its technical problems is as follows:

A prefabricated tunnel lining structure of the present invention includes an initial support structure, a water-proof and drainage system and a secondary lining structure arranged from the inside out, and the secondary lining structure includes an inverted arch, a secondary lining of a side wall and a secondary lining of the arch. The lining is characterized in that: the two ends of the inverted arch are consolidated with the bottom end of the secondary lining of the side wall, and are formed by continuous pouring in sections along the extending direction of the tunnel; the secondary lining of the arch is a prefabricated structure, made of reinforced concrete prefabricated blocks The unit is assembled longitudinally, and its two circumferential ends are overlapped with the secondary lining of the side wall on the same side through a connecting structure, or a fixed connection is formed through connecting members and post-casting joints.

The beneficial effect of the invention is that, under the advantage of the flexible construction of the mining method tunnel, the secondary lining of the arch adopts a prefabricated assembly structure, and the reinforced concrete prefabricated block units can be mass-produced in the factory, and then transported to the site for mechanized assembly. Improve on-site labor conditions, save materials, and improve the mechanization level and labor efficiency of tunnel construction; because the arch lining is prefabricated in factories, it can effectively ensure the structural quality and avoid the quality defects of the arch lining caused by the cast-in-place process. During operation, the lining of the arch is damaged to ensure driving safety.

Description of drawings

This manual includes the following fifteen drawings:

1 is a cross-sectional view of a fabricated tunnel lining structure of the present invention;

2 to 9 are schematic diagrams of the connection mode of the secondary lining of the side wall and the secondary lining of the arch in a fabricated tunnel lining structure of the present invention;

Figure 10 is a cross-sectional view along line B-B in Figure 9;

Figure 11 is a sectional view along line C-C in Figure 9;

Figures 12 and 13 are schematic views of the assembling method of the secondary lining of the arch in an assembled tunnel lining structure of the present invention;

14 and 15 are schematic diagrams of the assembling method of the secondary lining of the arch in a fabricated tunnel lining structure of the present invention;

Parts, components and corresponding marks are shown in the figure: initial support structure 10, waterproof and drainage system 20, side wall secondary lining 30, inverted arch 31, inverted arch filling layer 31a, arch secondary lining 32, circumferential connection Bolts 41, annular sealing ring 42, annular waterproof gasket 43, first section steel member 51, second section steel member 52, connecting section steel 53, connecting bar 54, post-cast concrete 55, longitudinal waterproof gasket 60, longitudinal connecting bolts 70. Prestressed steel bar 71.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 1, a kind of prefabricated tunnel lining structure of the present invention includes the initial support structure 10, the water-proof and drainage system 20 and the secondary lining structure set from the inside to the outside, and the secondary lining structure comprises the inverted arch 31, the side wall two Secondary lining 30 and arch secondary lining 32. The two ends of the inverted arch 31 are consolidated with the bottom end of the side wall secondary lining 30, and are formed by continuous pouring in sections along the extending direction of the tunnel, that is, the inverted arch 31 and the side wall secondary lining 30 are constructed by on-site vertical formwork casting. The arch secondary lining 32 is a prefabricated structure, which is longitudinally assembled by reinforced concrete prefabricated block units, and its circumferential ends are overlapped with the secondary lining 30 of the side wall on the same side through a connecting structure, or formed by connecting members. Fixed connection. Taking full advantage of the flexibility of mining tunnel construction, the secondary lining 32 of the arch adopts a prefabricated assembly structure, and its reinforced concrete prefabricated block units can be mass-produced in the factory, and then transported to the site for mechanized assembly to improve on-site labor conditions. It saves materials and improves the mechanization level and labor efficiency of tunnel construction. Because the reinforced concrete prefabricated block unit is factory prefabricated, it can effectively ensure the structural quality, avoid the quality defects of the arch lining caused by the cast-in-place process, avoid the arch lining disease during the operation process, and ensure the driving safety.

6 and 7 , the contact surfaces of the side wall secondary lining 30 and the arch secondary lining 32 are in a corresponding L-shape or concave-convex shape, and the connection structure is an L-shaped tenon joint structure or concave-convex shape formed by the contact surfaces. Type tenon joint structure, a longitudinally extending annular waterproof gasket 43 is arranged on the contact surface. During application, the secondary lining 32 of the arch portion is directly placed on the secondary lining 30 of the side wall.

2 to 5 , the contact surfaces of the side wall secondary lining 30 and the arch secondary lining 32 are corresponding planes or arc surfaces, and the connecting member is to pass through the side wall secondary lining 30 and the arch two. The annular connecting bolts 41 of the connecting holes at the ends of the secondary lining 32 are provided with longitudinally extending annular waterproof gaskets 43 on the contact surface. The annular connecting bolts 41 may be arc-shaped bolts or obliquely arranged straight bolts.

Referring to FIGS. 10 and 11 , the post-casting joint forms a fixed connection consisting of a circumferentially extending first section steel member 51 , a second section steel member 52 , connecting section steel 53 , stubbing steel bars 54 and post-cast concrete 55 . The first shaped steel member 51 is embedded in the secondary lining 30 of the side wall, the second shaped steel member 52 is pre-buried in the secondary lining 32 of the arch, and the two ends of the connecting shaped steel 53 are respectively connected with the first shaped steel member 51 and the second shaped steel. The overhanging ends of the members 52 are connected by welding. The connecting bars 54 are arranged outside the first-shaped steel member 51 and the second-shaped steel member 52, and the post-cast concrete 55 is poured between the circumferential end faces of the secondary lining 30 of the side wall and the secondary lining 32 of the arch.

The secondary lining 32 of the arch portion is a prefabricated structure, which is longitudinally assembled by reinforced concrete prefabricated block units. 12 and 13 , two adjacent reinforced concrete prefabricated block units in the secondary lining 32 of the arch portion are connected as a whole by longitudinal connecting bolts 70 passing through the longitudinal connecting holes. 14 and 15, the adjacent plurality of reinforced concrete prefabricated block units in the secondary lining 32 of the arch portion are connected into a group by longitudinally extending prestressed steel bars 71, and the adjacent groups are connected by longitudinal connecting holes. The longitudinal connecting bolts 70 are connected in one piece. In order to ensure the waterproof performance of the secondary lining 32 of the arch, a longitudinal waterproof gasket 60 extending in a circumferential direction is provided between the longitudinal contact surfaces of two adjacent reinforced concrete prefabricated block units in the secondary lining 32 of the arch. The longitudinal connecting bolts 70 can be arc-shaped bolts or obliquely arranged straight bolts.

The above is only to illustrate some principles of a fabricated tunnel lining structure of the present invention, and it is not intended to limit the present invention to the specific structure and scope of application shown and described, so all the corresponding modifications that may be used are and equivalents, all belong to the scope of the patent application of the present invention.

Claims (8)

1. a prefabricated tunnel lining structure, comprising an initial support structure (10), a water-proof and drainage system (20) and a secondary lining structure set from the inside out, and the secondary lining structure comprises an inverted arch (31), a side wall The secondary lining (30) and the arch secondary lining (32) are characterized in that: the two ends of the inverted arch (31) are consolidated with the bottom end of the side wall secondary lining (30), and the segments are continuous along the extending direction of the tunnel. Pouring and forming; the arch secondary lining (32) is a prefabricated structure, which is longitudinally assembled by reinforced concrete prefabricated block units, and its circumferential ends and the secondary lining (30) of the side wall on the same side are formed by connecting the structure to form an overlap. connection, or form a fixed connection by connecting components and post-casting joints. 2. An assembled tunnel lining structure according to claim 1, characterized in that: the contact surfaces of the side wall secondary lining (30) and the arch secondary lining (32) are in a corresponding L-shape or concave-convex The connection structure is an L-shaped tenon joint structure or a concave-convex tenon joint structure formed by the contact surface. 3. An assembled tunnel lining structure according to claim 1, characterized in that: the contact surfaces of the side wall secondary lining (30) and the arch secondary lining (32) are corresponding planes or arcs The connecting members are annular connecting bolts (41) passing through the end connecting holes of the side wall secondary lining (30) and the arch secondary lining (32). 4. An assembled tunnel lining structure according to claim 2 or 3, wherein a longitudinally extending annular waterproof gasket (43) is arranged on the contact surface. 5. An assembled tunnel lining structure according to claim 1, characterized in that: the post-casting joint is composed of a first section steel member (51), a second section steel member (52), a connecting section steel and a circumferentially extending first section steel member (52). (53), stubble steel bars (54) and post-cast concrete (55); the first shaped steel member (51) is embedded in the secondary lining (30) of the side wall, and the second shaped steel member (52) is pre-buried in the arch Inside the secondary lining (32), the two ends of the connecting section steel (53) are respectively welded and connected with the overhanging ends of the first section steel member (51) and the second section steel member (52); the connecting bars (54) are arranged on the Outside the first-shaped steel member (51) and the second-shaped steel member (52), post-cast concrete (55) is poured between the circumferential end faces of the side wall secondary lining (30) and the arch secondary lining (32). 6. An assembled tunnel lining structure according to claim 1, characterized in that: two adjacent reinforced concrete prefabricated block units in the secondary lining of the arch (32) are formed by the longitudinal direction passing through the longitudinal connecting hole. The connecting bolts (70) are connected as a whole. The prefabricated tunnel lining structure according to claim 1, characterized in that: the adjacent plurality of reinforced concrete prefabricated block units in the secondary lining of the arch (32) are composed of longitudinally extending prestressed steel bars (71) are connected as a group, and adjacent groups are connected as a whole by longitudinal connection bolts (70) passing through the longitudinal connection holes. 8. An assembled tunnel lining structure according to claim 6 or 7, characterized in that: between the longitudinal contact surfaces of two adjacent reinforced concrete prefabricated block units in the secondary lining of the arch (32) An annularly extending longitudinal waterproof gasket (60) is provided.

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