CN107387102B - Reconstruction shield machine for shield tunnel - Google Patents

Abstract

The invention discloses a reconstruction shield machine for a shield tunnel. The reconstruction shield machine includes an outer shield shell and an inner shield shell arranged coaxially; the front end of the outer shield shell and the space between the inner shield shell An annular earth tank breast plate is connected; an annular cutterhead is arranged on the front of the annular earth tank breast plate; an existing shield tunnel roundness correction system and an existing shield tunnel dismantling system are arranged inside the outer shield shell. The advantage of the present invention is that the reconstruction shield machine can smoothly dismantle the shield tunnel to be scrapped and assemble a new shield tunnel at the same time, which solves the difficulty of scrapping the existing shield tunnel and the spatial location problem of the new shield tunnel. It also minimizes the disturbance to the ground and protects the surrounding environment and structures of the tunnel to the maximum extent.

Description

A reconstructed shield machine for a shield tunnel

Technical field

The invention belongs to the field of tunnel engineering, and specifically relates to a reconstructed shield machine for a shield tunnel.

Background technique

Shield tunnels have a certain design life, and judging from the shield tunnels that have been in operation, they are seriously damaged, such as excessive structural deformation, structural cracks, broken edges, structural water leakage, etc., which seriously threaten the safety of shield tunnels. service life. Therefore, it will be an inevitable fact that the shield tunnels currently in operation will be reconstructed in the near future. However, if the lining is directly molded into the existing shield tunnel, it will not be able to meet the requirements of the subway train limits from a design perspective. If the existing shield tunnel is directly abandoned and a new shield tunnel is built in a different way, the instability of the existing shield tunnel in the future will directly affect its surface, surrounding structures, etc., and underground space resources will not allow it. Therefore, how to dismantle the existing shield tunnel that is close to being scrapped, how to select the spatial location of the new shield tunnel, and how to build a new shield tunnel are inevitable issues in the field of subway shield tunnels. An effective solution to the above problems is to use the space resources of the existing shield tunnel to dismantle the existing shield tunnel and then reassemble a new shield tunnel. However, existing shield machines cannot meet the above functions.

Contents of the invention

The object of the present invention is to provide a shield tunnel reconstruction shield machine based on the above-mentioned shortcomings of the prior art. The reconstruction shield machine can simultaneously construct a new shield tunnel while dismantling the existing tunnel, effectively solving the problem of The existing tunnel is difficult to scrap and dispose of, as well as the space problem of the new shield tunnel.

The purpose of the present invention is achieved by the following technical solutions:

A reconstructed shield machine for a shield tunnel. The reconstructed shield machine includes an outer shield shell and an inner shield shell arranged coaxially; an annular soil is connected between the front end of the outer shield shell and the inner shield shell. The tank chest plate is provided with an annular cutterhead on the front of the annular earth tank chest plate; the existing shield tunnel roundness correction system and the existing shield tunnel dismantling system are installed inside the outer shield shell.

There is an annular earth bin between the annular earth bin breast plate and the cutterhead. The back side of the annular earth bin breast plate is provided with an earth chamber slag discharging device and an annular cutterhead driving device for driving the annular cutterhead to rotate.

The inner surface of the inner shield shell is provided with a front shield shell waterproof structure.

A number of guide wheels are provided on the front edge of the inner shield shell.

The existing shield tunnel roundness correction system includes horizontal struts and a correction disk composed of several correction rods; the center of the correction disk is vertically arranged at the front end of the horizontal brace; each of the correction rods is in a radial shape arranged to form the correction plate; the first end of the correction rod is connected to the horizontal support rod.

The correction rod is a hydraulically driven telescopic rod, and a guide wheel is connected to its second end.

One end of the horizontal strut is fixedly connected to the correction system bracket inside the outer shield shell.

The horizontal strut is coaxially arranged with the inner shield shell.

A number of hydraulic jacking cylinders are provided inside the outer shield shell toward the rear end of the outer shield shell.

The inner diameter of the outer shield shell is 15-30cm larger than the outer diameter of the newly built shield tunnel.

The advantage of the present invention is that the reconstruction shield machine can smoothly dismantle the shield tunnel to be scrapped and assemble a new shield tunnel at the same time, which solves the difficulty of scrapping the existing shield tunnel and the spatial location problem of the new shield tunnel. It also minimizes the disturbance to the ground and protects the surrounding environment and structures of the tunnel to the maximum extent.

Description of the drawings

Figure 1 is a cross-sectional view of the reconstructed shield machine in the present invention;

Figure 2 is a partial enlarged view of position A in Figure 1 according to the present invention;

Figure 3 is a schematic diagram of the correcting disk in the working process of the present invention.

Detailed ways

The features and other related features of the present invention will be further described in detail through examples in conjunction with the accompanying drawings to facilitate the understanding of those skilled in the industry:

As shown in Figure 1-3, the marks 1-19 in the figure are: reconstructed shield machine 1, existing shield tunnel 2, outer shield shell 3, inner shield shell 4, annular earth tank chest plate 5, annular cutterhead 6, both There are shield tunnel dismantling system 7, existing shield tunnel roundness correction system 8, new shield tunnel 9, horizontal brace 10, correction rod 11, correction plate 12, correction system bracket 13, guide wheel 14, annular cutterhead Driving device 15, soil chamber slag discharging device 16, front shield shell waterproof structure 17, guide wheel 18, hydraulic jacking cylinder 19, annular soil bin 20.

Embodiment: As shown in Figure 1, this embodiment specifically relates to a reconstructed shield machine for a shield tunnel. The reconstructed shield machine 1 includes a cylindrical outer shield shell 3 and an inner shield shell 4; the inner shield shell 4 is configured Inside the outer shield shell 3, they are coaxially arranged; an annular earth tank breast plate 5 is connected between the front end of the outer shield shell 3 and the inner shield shell 4; an annular cutterhead 6 is provided at the front opening of the annular earth tank breast plate 5. There is an annular earth bin 20 between the annular earth bin breast plate 5 and the annular cutterhead 6; an existing shield tunnel roundness correction system 8 is provided inside the outer shield shell 3; the inner shield shell 4 is used to be installed on the existing shield tunnel On the outer surface of the tunnel 2, the existing shield tunnel dismantling system 7 is used to dismantle the segments of the existing shield tunnel 2 during the jacking process of the reconstructed shield machine 1.

As shown in Figures 1 and 2, the annular cutterhead 6 surrounds the outer surface of the inner shield shell 4; the outer diameter of the annular cutterhead 6 is the same as the diameter of the outer shield shell 3, and an annular cutter is provided on the back of the annular earth tank breast plate 5 Disk driving device 15; annular cutterhead driving device 15 is used to drive the annular cutterhead 6 to rotate along the axis of the outer shield shell 3; during the rotation of the annular cutterhead 6, it can cut the soil in front of the reconstructed shield machine 1; in the annular soil chamber The back side of the chest plate 5 is also provided with a soil chamber slag discharge device 16, and the soil in the annular soil chamber 20 can be discharged through the soil chamber slag discharge device 16; the reconstruction shield machine 1 of this embodiment can be an earth pressure balance shield machine, It can also be used as a mud-water balance shield machine.

As shown in Figures 1 and 2, in order to ensure the sealing between the inner surface of the inner shield shell 4 and the outer surface of the existing shield tunnel 2; a front shield shell waterproof structure 17 is provided on the inner surface of the inner shield shell 4; The front shield shell waterproof structure 17 is closely attached to the outer surface of the existing shield tunnel 2, which can prevent groundwater and mud in front of the reconstructed shield machine 1 from entering the interior of the reconstructed shield machine 1; in order to ensure that the reconstructed shield machine 1 is jacked During the process, the inner shield shell 4 can slide smoothly along the outer surface of the existing shield tunnel 2, and a plurality of guide wheels 18 are provided at the front edge of the inner shield shell 4.

As shown in Figures 1 and 3, the existing shield tunnel 2 has experienced a long period of use after its completion. During this process, the existing shield tunnel 2 will be deformed under the action of external forces such as uneven settlement of the ground. After deformation, The cross-sectional shape of the existing shield tunnel 2 is inconsistent with the cross-sectional shape of the inner shield shell 4, so that the inner shield shell 4 cannot slide smoothly along the outer surface of the existing shield tunnel 2; in order to solve this problem, the reconstruction of this embodiment An existing shield tunnel roundness correction system 8 is installed inside the shield machine 1; the existing shield tunnel roundness correction system 8 includes a horizontal brace 10 and a correction disk 12 composed of a plurality of correction bars 11; the horizontal brace One end of 10 is fixedly connected to the internal correction system bracket 13; the horizontal strut 10 is coaxially arranged with the inner shield shell 4.

As shown in Figures 1 and 3, the horizontal support rod 10 is vertically connected to the center of the correction plate 12; each correction rod 11 is arranged radially to form a correction plate; the first end of the correction rod 11 is connected to the end of the horizontal support rod 10; the correction rod A guide wheel 14 is installed on the second end of 11; the correction rod 11 is a hydraulically driven telescopic rod, and the telescopic rods can have the same telescopic length to form a circular correction disk; the guide wheel 14 can make the second end of the correction rod 11 The end can slide along the inner surface of the existing shield tunnel 2 during the jacking process of the reconstructed shield machine 1 to guide the outer shield shell 3.

As shown in Figures 1 and 3, in the process of using the existing shield tunnel roundness correction system 8 to correct the cross-sectional shape of the existing shield tunnel 2, the correction disk 12 is set at the end of the existing shield tunnel 2. The correction plate 12 is perpendicular to the axis of the existing shield tunnel 2, and the second end of the correction rod 11 of the correction plate 12 is supported on the inner surface of the existing shield tunnel 2; by adjusting the expansion and contraction of each correction rod 11, not only The cross-sectional shape of the existing shield tunnel 2 where the correction disk 12 is located can be adjusted, and the correction force can be transmitted to the front and rear sides of the position where the correction disk 12 is located through the connection structure between the tunnel segments, thereby adjusting the entire shield tunnel 2. The existing shield tunnel 2 within a certain range in front of the correction disk 12 performs regional correction so that the inner shield shell 4 can slide smoothly along the outer surface of the existing shield tunnel 2; in addition, the correction disk 12 also It can play a supporting role to prevent the end of the existing shield tunnel 2 from collapsing during the disassembly process.

As shown in Figure 1, the outer shield shell 3 is provided with a number of hydraulic jacking cylinders 19 toward the rear end; during the jacking process of the reconstructed shield machine 1, segments of the newly constructed shield tunnel 9 are continuously assembled at the rear end. The outer diameter of the newly built shield tunnel 9 is slightly smaller than the inner diameter of the outer shield shell 3; the inner diameter of the outer shield shell 3 is 15-30cm larger than the outer diameter of the newly built shield tunnel 9. The outer diameter of the new shield tunnel 9 is 1-2m larger than the outer diameter of the existing shield tunnel 2, and the segment thickness is 0.1-0.25m larger than the existing shield tunnel 2; during the jacking process of the reconstructed shield machine 1, The hydraulic jacking cylinder 19 is supported on the front edge of the segment of the newly built shield tunnel 9.

As shown in Figure 1, the method for tunnel reconstruction using the reconstruction shield machine 1 of this embodiment includes the following steps:

1) As shown in Figure 1, install the reconstructed shield machine 1 at the end of the existing shield tunnel 2; install the inner shield shell 4 of the reconstructed shield machine on the outer surface of the existing shield tunnel 2;

2) As shown in Figure 1, the rebuilt shield machine 1 is pushed forward. Before pushing, the internal existing shield tunnel roundness correction system 8 is used to correct the end of the existing shield tunnel 2. Due to the existing The shield tunnel 2 is corrected by the existing shield tunnel roundness correction system 8, so the guide wheel 18 on the reconstructed shield machine 1 can guide and slide along the corrected outer surface of the existing shield tunnel 2; jacking After completion, use the internal existing shield tunnel dismantling system 7 to dismantle the end of the existing shield tunnel 2, and assemble the segments of the new shield tunnel 9 at the tail of the outer shield shell 3; repeat the above to rebuild the top of the shield machine 1 The process will continue until the reconstruction of the existing shield tunnel is completed.

The beneficial technical effects of this embodiment are: the reconstructed shield machine can smoothly dismantle the shield tunnel to be scrapped and assemble a new shield tunnel at the same time, solving the difficulty of scrapping the existing shield tunnel and solving the problem of space for the new shield tunnel. location problem, and minimize the disturbance to the ground, maximizing the protection of the surrounding environment and structures of the tunnel.

Claims (6)

1. The reconstruction shield machine of the shield tunnel is characterized by comprising an outer shield shell and an inner shield shell which are coaxially arranged; an annular soil cabin chest plate is connected between the front end of the outer shield shell and the inner shield shell; the front surface of the annular soil cabin chest plate is provided with an annular cutter disc; an existing shield tunnel roundness correction system and an existing shield tunnel dismantling system are arranged in the outer shield shell;

the existing shield tunnel roundness correction system comprises a horizontal stay bar and a correction disc consisting of a plurality of correction bars; the center of the correcting disc is vertically arranged at the front end part of the horizontal stay bar; each correction rod is arranged radially to form the correction disc; the first end of the correcting rod is connected with the horizontal stay rod;

the correcting rod is a hydraulically driven telescopic rod, and the second end of the correcting rod is connected with a guide wheel;

one end of the horizontal stay bar is fixedly connected to a correction system bracket in the outer shield shell;

the horizontal stay bars and the inner shield shell are coaxially arranged.

2. The reconstruction shield machine for the shield tunnel according to claim 1, wherein an annular soil bin is arranged between the annular soil bin breast plate and the cutterhead, and a soil bin slag discharging device and an annular cutterhead driving device for driving the annular cutterhead to rotate are arranged on the back surface of the annular soil bin breast plate.

3. The reconstruction shield machine for a shield tunnel according to claim 1, wherein the inner surface of the inner shield shell is provided with a front shield shell waterproof structure.

4. The machine according to claim 1, wherein the front edge of the inner shield shell is provided with a plurality of guide wheels.

5. The reconstruction shield machine for the shield tunnel according to claim 1, wherein a plurality of hydraulic jacking cylinders facing the rear end of the outer shield shell are arranged in the outer shield shell.

6. The reconstruction shield machine of a shield tunnel according to claim 1, wherein the inner diameter of the outer shield shell is 15-30cm larger than the outer diameter of the newly built shield tunnel.