CN111305869A - Prefabricated lining structure of arch wall and construction method - Google Patents

Abstract

A prefabricated lining structure of an arch wall and a construction method are provided, which aim to effectively ensure the quality of an arch lining while improving the industrialization degree and the construction efficiency of the mine tunnel construction, solve the lining quality defect caused by difficult cast-in-place control, ensure the safety of tunnel operation and reduce the investment of renovation in the operation period. The primary support structure, the waterproof and drainage system and the secondary lining structure are arranged from inside to outside, and the secondary lining structure is composed of an inverted arch and an arch wall secondary lining structure. The inverted arch is formed by continuous casting in a segmented mode along the extending direction of the tunnel; the arch wall secondary lining structure is a reinforced concrete prefabricated structure and is formed by longitudinally assembling arch wall secondary lining sections, the two circumferential ends of the arch wall secondary lining sections are in lap joint with the two circumferential ends of an inverted arch, and each arch wall secondary lining section is formed by annularly assembling at least three arch wall secondary lining building blocks.

Description

A kind of arch wall prefabricated lining structure and construction method

technical field

The invention relates to a tunnel lining structure, in particular to a prefabricated tunnel lining structure using prefabricated components within an arch wall and a construction method thereof.

Background technique

In recent years, my country's railway construction has developed rapidly, especially the construction of high-speed railway has entered an explosive growth stage. 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 process quality and other factors, some sections have initial support or void behind the lining, insufficient thickness of the secondary lining, cracks, water seepage, construction joints staggered, and uneven or insufficient concrete strength. Such quality problems 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: because the lining is cast as a whole on site, the pouring process is very important to the quality of the lining. However, in the 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 appear 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 the line. 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 problem of the quality defect of the tunnel lining, 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 lining structure of an arch wall, so as to effectively ensure the quality of the arch lining while improving the industrialization degree and construction efficiency of the tunnel construction by the mine method, and solve the problem of lining caused by the difficulty of on-site pouring control. Quality defects, ensure the safety of tunnel operation, and reduce the investment in remediation during the operation period.

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

The prefabricated lining structure of an arch wall of the present invention includes an initial support structure, a water-proof and drainage system and a secondary lining structure arranged from the inside to the outside. The secondary lining structure is composed of an inverted arch and an arch wall secondary lining structure. It is: the inverted arch is formed by continuous pouring in sections along the extension direction of the tunnel; the secondary lining structure of the arch wall is a reinforced concrete prefabricated structure, which is longitudinally assembled by the secondary lining sections of the arch wall, and the secondary lining sections of the arch wall are formed. The two circumferential ends of the arch wall are overlapped with the circumferential two ends of the inverted arch, and each secondary lining section of the arch wall is formed by at least three secondary lining blocks of the arch wall being assembled circumferentially.

Another technical problem to be solved by the invention provides the above-mentioned construction method of the prefabricated lining structure of an arch wall. The method includes the following steps:

①The tunnel is excavated to the face of the tunnel;

② Implement the initial support structure in time;

③ Implement waterproof and drainage system;

④The inverted arch is applied at a certain distance from the lag face;

⑤ lag the inverted arch at a certain distance and apply the inverted arch filling layer;

⑥ After the tunnel face is excavated to the predetermined position, the excavation is stopped, and the initial support structure, the waterproof and drainage system, the inverted arch and the inverted arch filling layer are applied to this position and reach the corresponding design strength;

⑦ Lay arch wall secondary lining trolley running track;

⑧Complete the assembly of the secondary lining segment of the arch wall at the opening;

⑨Using the arch wall secondary lining trolley to transport an arch wall secondary lining segment from the hole to the position of the face and complete the assembly with the inverted arch;

⑩Repeat steps ⑧ and ⑨, assemble the next secondary lining segment of the arch wall with the palm facing the direction of the opening, and use longitudinal connecting bolts to assemble and connect the secondary lining segment of the arch wall as a whole until it is assembled to the opening, and the second arch wall is completed. Assembly and construction of secondary lining.

The beneficial effect of the invention is that, under the advantage of the flexible construction of mining tunnels, the lining of the arch wall adopts prefabricated assemblies, which can be mass-produced in the factory, and then transported to the site for mechanized assembly, thereby improving the working conditions on site and saving materials. The mechanization level and labor efficiency of tunnel construction are improved. At the same time, because the arch wall lining is factory prefabricated, it can effectively ensure the structural quality, avoid lining quality defects caused by cast-in-place process problems, avoid arch lining diseases during operation, and ensure driving safety.

Description of drawings

This manual includes the following ten drawings:

Fig. 1 is the cross-sectional view of a kind of arch wall prefabricated lining structure of the present invention;

Fig. 2 and Fig. 3 are the oblique bolt connection schematic diagrams of the longitudinal joints between the prefabricated lining blocks of the arch wall in a prefabricated lining structure of the arch wall of the present invention;

Fig. 4 and Fig. 5 are the bending bolt connection schematic diagram of the longitudinal joint between the prefabricated lining blocks of the arch wall in a kind of arch wall prefabricated lining structure of the present invention;

Fig. 6 is the connection part schematic diagram between the prefabricated lining block of the arch wall and the inverted arch in a prefabricated lining structure of the arch wall of the present invention;

Fig. 7 is a kind of arch wall prefabricated lining structure of the present invention, the arch wall prefabricated lining block along the tunnel longitudinal direction through joint assembly schematic diagram;

Fig. 8 is the staggered assembly schematic diagram of the prefabricated lining block of the arch wall along the longitudinal direction of the tunnel in a prefabricated lining structure of the arch wall of the present invention;

Fig. 9 and Fig. 10 are the bolted connection schematic diagrams of the annular joint between the prefabricated lining blocks of the arch wall in a prefabricated lining structure of the arch wall of the present invention;

Figures 11 to 18 are exploded schematic views of the construction steps of a prefabricated lining structure for an arch wall of the present invention.

Parts, components and corresponding marks are shown in the figure: initial support structure 10, waterproof and drainage system 20, secondary lining block 30 of arch wall, inverted arch 31, inverted arch filling layer 31a, circumferential connecting bolt 41, circumferential direction The connection hole sealing ring 42 , the first annular waterproof gasket 32 , the second annular waterproof gasket 33 , the longitudinal connection bolts 51 , the longitudinal connection hole sealing ring 52 , the longitudinal waterproof gasket 53 , and the face D.

Detailed ways

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

Referring to Figure 1, a prefabricated lining structure of an arch wall of the present invention includes an initial support structure 10, a water-proof and drainage system 20 and a secondary lining structure that are set from the inside out, and the secondary lining structure is composed of an inverted arch 31 and an arch wall two. The secondary lining structure is formed, and it is characterized in that: the inverted arch 31 is formed by continuous pouring in sections along the extension direction of the tunnel; the secondary lining structure of the arch wall is a reinforced concrete prefabricated structure, which is longitudinally assembled by the secondary lining segments of the arch wall. , the two circumferential ends of the secondary lining section of the arch wall are overlapped with the two circumferential ends of the inverted arch 31, and each secondary lining section of the arch wall is formed by circumferentially assembling at least three secondary lining blocks 30 of the arch wall. . Taking full advantage of the flexibility of mining tunnel construction, the arch wall lining adopts prefabricated assemblies, which can be mass-produced in the factory, and then transported to the site for mechanized assembly, which improves on-site labor conditions, saves materials, and improves the mechanization level of tunnel construction. and labor efficiency. At the same time, because the lining of the arch wall is factory prefabricated, it can effectively ensure the structural quality, avoid lining quality defects caused by cast-in-place process problems, avoid arch lining diseases during operation, and ensure driving safety.

Referring to 6, the annular end of the inverted arch 31 is a concave arc surface, and the annular end of the arch wall secondary lining block 30 that forms overlap is the convex arc surface that fits with the concave arc surface. A longitudinally extending second annular waterproof gasket 33 is arranged between the lower concave arc surface and the lower convex arc surface.

Referring to Fig. 7 and Fig. 8, in the secondary lining structure of the arch wall, the secondary lining blocks 30 of the arch wall of each adjacent secondary lining segment of the arch wall are assembled according to through seam or staggered seam assembly.

Referring to FIGS. 2 to 5 , in the secondary lining section of the arch wall, the annular contact surfaces of the adjacent secondary lining blocks 30 of the arch wall are corresponding planes or arcs, and the annular contact surfaces passing through the annular connecting holes The connecting bolts 41 connect two adjacent arch wall secondary lining blocks 30 as a whole. A longitudinally extending first annular waterproof gasket 32 is arranged on the annular contact surface, and annular connecting hole sealing rings 52 are arranged at both ends of the annular connecting hole. Circumferential connecting bolts 41 can be curved bolts or straight bolts

9 and 10, in the secondary lining section of the arch wall, the secondary lining sections of the adjacent two arch walls are connected by the longitudinal connecting bolts 51 passing through the longitudinal connecting holes of the secondary lining blocks 30 of the adjacent two arch walls. The segments are assembled into one. A circumferentially extending longitudinal waterproof gasket 53 is provided on the longitudinal contact surfaces of the secondary lining blocks 30 of the adjacent two arch walls, and longitudinal connection hole sealing rings 52 are provided at the outer ends or both ends of the longitudinal connection bolts 51.

Referring to Figure 11 to Figure 18, a construction method of a prefabricated lining structure of an arch wall of the present invention comprises the following steps:

①The tunnel is excavated to the face D;

②The initial support structure 10 is installed in time;

③ Implement waterproof and drainage system 20;

④ The inverted arch 31 is applied at a certain distance from the lag face D;

⑤ lag the inverted arch 31 a certain distance and perform the inverted arch filling layer 31a;

6. the face D is excavated and stops excavation after the predetermined position, treats the initial stage support structure 10, the anti-drainage system 20, the inverted arch 31 and the inverted arch filling layer 31a and is applied to this position and reaches the corresponding design strength;

⑦ Lay arch wall secondary lining trolley running track;

⑧Complete the assembly of the secondary lining segment of the arch wall at the opening;

⑨ Utilize the arch wall secondary lining trolley to transport an arch wall secondary lining segment from the hole to the palm face position and complete the assembling with the inverted arch 31;

⑩ Repeat steps ⑧ and ⑨, assemble the next secondary lining section of the arch wall from the face D to the hole, and use the longitudinal connecting bolts 51 to assemble and connect the secondary lining section of the arch wall as a whole until the assembly reaches the hole, complete Assembled construction of secondary lining of arch walls.

The above is only to illustrate some principles of an arch wall prefabricated lining structure and construction method 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. The corresponding modifications and equivalents of the present invention all belong to the scope of the patent applied for by the present invention.

Claims (8)

1. a prefabricated lining structure of an arch wall, comprising the initial stage support structure 10, the waterproof and drainage system 20 and the secondary lining structure that are set from the inside out, and the secondary lining structure is made up of the inverted arch 31 and the secondary lining structure of the arch wall, It is characterized in that: the inverted arch (31) is formed by continuous pouring in sections along the extension direction of the tunnel; the secondary lining structure of the arch wall is a reinforced concrete prefabricated structure, which is longitudinally assembled by the secondary lining segments of the arch wall, and the arch wall is formed. The two circumferential ends of the secondary lining segment are overlapped with the circumferential two ends of the inverted arch (31), and each arch wall secondary lining segment is circumferentially assembled by at least three arch wall secondary lining blocks (30). form. 2. a kind of arch wall prefabricated lining structure as claimed in claim 1, is characterized in that: described inverted arch (31) annular end is concave arc surface, and forms the arch wall secondary lining block of overlapping connection with it (30) The annular end is a lower convex arc surface that fits with the lower concave arc surface, and a longitudinally extending second annular waterproof gasket (33) is arranged between the pair of lower concave arc surfaces and the lower convex arc surface. 3. a kind of arch wall prefabricated lining structure as claimed in claim 1 is characterized in that: in described arch wall secondary lining structure, the arch wall secondary lining blocks ( 30) Assemble according to through seam or wrong seam. 4. The prefabricated lining structure of an arch wall according to claim 1, characterized in that: in the secondary lining segment of the arch wall, the circumferential contact surface of the adjacent secondary lining blocks (30) of the arch wall is in the shape of a ring. For the corresponding plane or arc surface, two adjacent secondary lining blocks (30) of the arch wall are connected together by annular connecting bolts (41) passing through the annular connecting holes. 5. The prefabricated lining structure of an arch wall according to claim 4, characterized in that: a longitudinally extending first annular waterproof gasket (32) is arranged on the annular contact surface, at both ends of the annular connecting hole Set the annular connecting hole sealing ring (52). 6. The prefabricated lining structure of an arch wall according to claim 4, characterized in that: in the secondary lining section of the arch wall, the secondary lining blocks (30) passing through two adjacent arch walls are longitudinally connected The longitudinal connecting bolts (51) of the holes assemble the secondary lining segments of two adjacent arch walls into one body. 7 . The prefabricated lining structure of an arch wall according to claim 6 , wherein the longitudinal contact surfaces of the secondary lining blocks ( 30 ) of the adjacent two arch walls are provided with longitudinal waterproof gaskets extending in a circumferential direction. 8 . (53), a longitudinal connecting hole sealing ring (52) is arranged on the outer end or both ends of the longitudinal connecting bolt (51). 8. the construction method of a kind of arch wall prefabricated lining structure as described in any one of claim 1 to 7, comprises the steps: ①The tunnel is excavated to the face (D); ②The initial support structure (10) shall be installed in time; ③ Implement a waterproof and drainage system (20); ④ The inverted arch (31) is applied at a certain distance from the lag face (D); ⑤ lag the inverted arch (31) a certain distance and apply the inverted arch filling layer (31a); ⑥The tunnel face (D) is excavated to the predetermined position and then stops excavation. After the initial support structure (10), the waterproof and drainage system (20), the inverted arch (31) and the inverted arch filling layer (31a) are applied to this position and achieve the corresponding design strength; ⑦ Lay arch wall secondary lining trolley running track; ⑧Complete the assembly of the secondary lining segment of the arch wall at the opening; ⑨Using the secondary lining trolley of the arch wall to transport the secondary lining segment of an arch wall from the hole to the position of the tunnel face and complete the assembly with the inverted arch (31); ⑩ Repeat steps ⑧ and ⑨ to assemble the next secondary lining segment of the arch wall from the face (D) to the hole, and use the longitudinal connecting bolts (51) to assemble and connect the secondary lining segment of the arch wall as a whole until the assembly is completed. At the entrance of the hole, the assembly construction of the secondary lining of the arch wall is completed.

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