CN208073510U - A kind of shield tunnel liner construction of the assembled prefabricated secondary lining section of jurisdiction in arch - Google Patents

Abstract

A shield tunnel lining structure for assembling prefabricated secondary lining segments at the arch part to effectively improve the construction efficiency of the secondary lining structure of the shield tunnel, enhance the waterproof performance of the tunnel, and make the tunnel maintainable and repairable after operation sex. Including the primary lining structure and the secondary lining structure, the primary lining structure is assembled from prefabricated primary lining segments. The anti-arch portion of the initial lining structure is fixed with track slabs or driveway slabs, and the inner wall of the arch above the track slab or driveway slab is provided with a waterproof and drainage structure layer, and other than the waterproof and drainage structure layer, there are prefabricated secondary lining segments assembled. Secondary lining structure, the secondary lining structure is closely attached to the waterproof and drainage structure layer.

Description

A shield tunnel lining structure with prefabricated secondary lining segments assembled at the arch

technical field

The utility model relates to shield tunnel engineering, in particular to a shield tunnel lining structure in which arch parts are assembled with prefabricated secondary lining segments.

Background technique

With the rapid development of domestic infrastructure, the shield tunneling method has been widely used. The waterproof design of the existing shield tunnels mostly follows the principle of "focusing on the self-waterproofing of the segments, focusing on the waterproofing of the joints, and multiple fortifications".

From the perspective of tunnel operation practice, the self-waterproofing of the segments can meet the requirements, but the waterproof effect of the gaskets and waterstop strips used at the joints of the segments is greatly affected by the quality of the segment assembly, and the reliability is poor.

According to the on-site investigation, the quality control of segment assembly is poor, and defects such as cracked joint concrete, misplaced segments, and open joints are emerging one after another. When the groundwater level is high, there will be obvious water leakage in the tunnel, which will have a great impact on operation, equipment anti-corrosion, and lining structure durability. At the same time, once the segments are installed, the gaskets and waterstops at the joints cannot be replaced.

In order to enhance the waterproof performance of shield tunnels, in recent years, some projects have applied secondary linings to the arches of shield tunnels. However, the existing secondary lining is to install formwork cast-in-place concrete in the tunnel, which has low construction efficiency and poor working environment, and the concrete pouring interferes greatly with the construction of the front shield machine and material transportation. In addition, the air between the tunnel arch and the cast-in-place concrete cannot be removed, causing the concrete filling in this area to be not dense, which becomes a gathering channel for groundwater leakage, and even causes the second lining to crack and seep in severe cases. At the same time, the seam gasket cannot be replaced after aging and failure.

Utility model content

The technical problem to be solved by the utility model is to provide a shield tunnel lining structure with prefabricated secondary lining segments assembled at the arch, so as to effectively improve the construction efficiency of the secondary lining structure of the shield tunnel, enhance the waterproof performance of the tunnel, and make the The tunnel has maintainability and repairability after operation.

The technical solution adopted by the utility model to solve its technical problems is as follows:

The utility model relates to a shield tunnel lining structure for assembling prefabricated secondary lining segments in the arch portion, including an initial lining structure and a secondary lining structure. The initial lining structure is assembled from prefabricated primary lining segments, and is characterized in that: The track slab or driveway slab is fixed on the anti-arch part of the initial lining structure, and the inner wall of the arch above the track slab or driveway slab is provided with a waterproof and drainage structure layer, and the second layer assembled from prefabricated secondary lining segments is arranged outside the waterproof and drainage structure layer. Secondary lining structure, the secondary lining structure is closely attached to the waterproof and drainage structure layer.

The beneficial effect of the utility model is that a waterproof and drainage structure layer is arranged on the inner wall of the initial lining structure of the shield tunnel, and the prefabricated secondary lining segments are assembled by an assembly machine to form the secondary lining structure of the arch, which effectively solves the problem of the secondary lining structure of the arch. The shortcomings of the lining structure are low efficiency and the concrete filling in the arch is not dense; when the structural layer of the waterproof and drainage layer is aging and fails, the prefabricated secondary lining segments can be removed, and the prefabricated secondary lining can be assembled after laying a new waterproof and drainage structural layer The segment solves the shortcoming that the current waterproof and drainage measures of the shield tunnel cannot be replaced, and makes the tunnel maintainable and repairable after operation.

Description of drawings

This manual includes the following seven drawings:

Figure 1 is a schematic diagram of the assembly of prefabricated primary lining segments;

Fig. 2 is a sectional view along line I-I in Fig. 1;

Fig. 3 is the schematic diagram of laying drainage layer;

Fig. 4 is a sectional view along line II-II in Fig. 3;

Figure 5 is a schematic diagram of the assembled prefabricated secondary lining segments;

Fig. 6 is a sectional view along line III-III in Fig. 5;

Figure 7 is a sectional view of the secondary lining.

The figure shows the component names and corresponding marks: formation D, shield machine 1, shield machine inner longitudinal beam 2, segment assembly machine 3, prefabricated initial lining segment 4, track slab or driveway slab 5, shield Mechanism shell 6, waterproof and drainage structure layer 7, prefabricated secondary lining segments 8, longitudinal bolt holes 9, hand holes 10, and circumferential bolt holes 11.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Referring to Fig. 6 and Fig. 7, a shield tunnel lining structure for assembling prefabricated secondary lining segments in the arch portion of the present utility model includes an initial lining structure and a secondary lining structure, and the initial lining structure is assembled from prefabricated primary lining segments 4 made. The anti-arch portion of the initial lining structure is fixedly provided with a track slab or a driveway slab 5, and a waterproof and drainage structure layer 7 is arranged outside the inner wall of the arch above the track slab or driveway slab 5, and a prefabricated secondary lining pipe is arranged outside the waterproof and drainage structure layer 7. The secondary lining structure assembled from sheets 8, the secondary lining structure is closely attached to the waterproof and drainage structure layer 7.

The waterproof and drainage structure layer 7 is a waterproof and drainage board laid between the inner wall of the arch of the primary lining structure and the outer wall of the arch of the secondary lining structure, or it can be a waterproof coating attached to the inner wall of the arch of the primary lining structure.

The circumferential joints of the prefabricated primary lining segments 4 and the circumferential joints of the prefabricated secondary lining segments 8 are staggered in the tunnel extension direction to ensure good waterproof performance of the tunnel.

A waterproof and drainage structure layer 7 is set between the arch of the initial lining structure of the shield tunnel and the arch of the secondary lining structure, and the prefabricated secondary lining segment 8 is assembled by an assembly machine to form the secondary lining structure of the arch, which effectively solves the problem of The cast-in-place secondary lining structure has the disadvantages of low operating efficiency and insufficient concrete filling in the arch. When the structural layer 7 of the waterproof and drainage layer is aging and fails, the prefabricated secondary lining segment 8 can be dismantled, a new waterproof and drainage structural layer 7 is laid, and then the prefabricated secondary lining segment 8 is assembled, which solves the problem of the current shield tunnel waterproofing and drainage. The shortcomings that the measures cannot be replaced make the tunnel maintainable and repairable after operation.

Referring to Figures 1 and 2, the shield machine 1 enters the ground for construction, and after excavating the soil in front, the jack in the shield machine 1 protrudes forward, and the segment assembly machine 3 installed on the inner longitudinal beam 2 of the shield machine Under the protection of the shield machine shell 6, the assembly of the prefabricated initial lining piece 4 is carried out, and the installation of the track plate or the driveway plate 5 is completed at the same time.

Referring to Figures 3 and 4, after the assembly of the prefabricated initial lining segment 4 is completed, the debris on the inner surface of the segment is removed and cleaned, and then the waterproof and drainage structure layer 7 is constructed along the area above the track slab or driveway slab 5 of the tunnel arch. The waterproof and drainage structure layer 7 can be a product-type waterproof and drainage board, and can also be sprayed with waterproof paint. In order to adapt to the uneven settlement in the later stage of the tunnel, when the waterproof and drainage structure layer 7 adopts the waterproof and drainage board, the waterproof and drainage board should have a certain redundant length, that is, the actual laying length should be greater than the theoretical laying length (usually the width of a single ring segment) , and seal the lap joints. In order to speed up the construction efficiency, the waterproof and drainage structure layer 7 can be constructed on the initial lining structure after the shield machine 1 has excavated and assembled several ring segments, so as to reduce the downtime of the shield machine 1 .

Referring to Figures 5 and 6, after the construction of the waterproof and drainage structure layer 7 is completed, the segment assembly machine 3 can be used to assemble the prefabricated secondary lining segments 8 above the track slab or driveway slab 5 of the tunnel arch. During assembly, the segment assembly machine 3 moderately radially squeezes the prefabricated secondary lining segment 8 to ensure that the secondary segment 8 is closely attached to the waterproof and drainage structure layer 7 . The segment assembly machine 3 can move back and forth along the tunnel axis on the longitudinal beam 2, so as to realize that the circumferential splicing seams of the prefabricated secondary lining segment 8 and the prefabricated primary lining segment 4 are staggered in the tunnel extension direction.

Referring to Fig. 7, in order to realize the replacement of the waterproof structural layer 7 after the operation of the tunnel, and to solve the current situation that the waterproof measures of the primary lining segment of the shield tunnel cannot be replaced, the prefabricated secondary lining segment 8 is connected by bolts during assembly. The prefabricated secondary lining segments 8 are provided with longitudinal bolt holes 9, circumferential bolt holes 11 and corresponding hand holes 10, and the adjacent prefabricated secondary lining segments 8 pass through the circumferential bolts passing through the corresponding longitudinal bolt holes 9 Longitudinal splices are formed, and circumferential splices are formed by longitudinal bolts passing through corresponding circumferential bolt holes 11 . When the waterproof structure layer 7 needs to be replaced, first remove the circumferential bolts and longitudinal bolts of the prefabricated secondary lining segment 8 , and then remove the prefabricated secondary lining segment 8 . After the waterproof structural layer 7 is replaced, the prefabricated secondary lining segments 8 are assembled to fix and protect the updated waterproof structural layer 7 .

The above is just to illustrate some principles of the shield tunnel lining structure of a kind of arch part assembled prefabricated secondary lining segment of the present invention by way of illustration, not to limit the present utility model to the specific structure and application shown and described Within the scope, all corresponding modifications and equivalents that may be used belong to the patent scope of the utility model application.

Claims (5)

1. a kind of shield tunnel liner construction of the assembled prefabricated secondary lining section of jurisdiction in arch, including initial stage liner structure and secondary lining Structure is built, initial stage liner structure is assembled by prefabricated initial stage lining segment (4), it is characterized in that：The initial stage liner structure Press down arch fixed setting track plates or lane plate (5), waterproof/drainage structure is arranged in arch inner walls more than track plates or lane plate (5) Layer (7), waterproof/drainage structure layer (7) is arranged in addition by the assembled secondary liner structure of prefabricated secondary lining section of jurisdiction (8), secondary Liner structure is fitted closely with waterproof/drainage structure layer (7).

2. a kind of shield tunnel liner construction of the assembled prefabricated secondary lining section of jurisdiction in arch as described in claim 1, feature It is：The waterproof/drainage structure layer (7) is to be layed between initial stage liner structure arch inner wall and secondary liner structure arch outer wall Drainable waterproofing plate.

3. a kind of shield tunnel liner construction of the assembled prefabricated secondary lining section of jurisdiction in arch as described in claim 1, feature It is：The waterproof/drainage structure layer (7) is the waterproof coating being attached on the inner wall of initial stage liner structure arch.

4. a kind of shield tunnel liner construction of the assembled prefabricated secondary lining section of jurisdiction in arch as described in claim 1, feature It is：The circumferential splicing seams of the prefabricated initial stage lining segment (4) are with the circumferential splicing seams of prefabricated secondary lining section of jurisdiction (8) in tunnel It is staggeredly located on extending direction.

5. a kind of shield tunnel liner construction of the assembled prefabricated secondary lining section of jurisdiction in arch as described in claim 1, feature It is：Longitudinal bolt hole (9), circumferential bolt hole (11) and corresponding hand hole (10) are set on the prefabricated secondary lining section of jurisdiction (8), Contiguous prefabricated secondary lining section of jurisdiction (8) is longitudinal spliced by passing through the circumferential bolt of corresponding longitudinal bolt hole (9) to be formed, and passes through Longitudinal bolt across corresponding circumferential bolt hole (11) forms circumferential splicing.