A shield tail support strengthening device and method applicable to synchronous pushing and assembling of large-diameter shield tunneling

Abstract

The present invention discloses a tail shield support strengthening device and method applicable to synchronous pushing and assembling of large-diameter shield tunneling. The device includes: a shield body; a steel plate bundle, which has a supporting state and a separated state. The steel plate bundle is movably installed on the inner wall of the shield body to realize the switching between the supporting state and the separated state. The steel plate bundle in the supporting state is used to contact the outer wall of the segment and support the segment; the steel plate bundle in the separated state is separated from the segment; a driving assembly, which is installed on the shield body and is used to drive the steel plate bundle to move so as to realize the switching between the supporting state and the separated state. The present invention can improve the continuity and efficiency of shield tunneling construction. Through the design of the steel plate bundle, it can contact the outer wall of the segment in the supporting state and provide stronger supporting force to ensure the stability and safety of the segment. The steel plate bundle has a supporting state and a separated state and can be flexibly switched according to construction needs, enabling the shield machine to maintain the best working state in different construction stages.

Description

Technical Field

[0001] The invention relates to the technical field of shield equipment, and in particular to a shield tail support reinforcement device and method suitable for synchronous pushing and assembling of large-diameter shields. Background Art

[0002] At present, shield machines generally adopt the traditional propulsion mode, that is, a linear construction mode of advancing one ring and assembling one ring. This mode generally only requires the installation of 4 shield tail brushes on the shield body, and the rebound force of the shield tail brushes is used to provide support for the pipe segments. However, as the construction of shield machines develops towards faster and better, the traditional propulsion mode can no longer meet the needs. In order to improve construction efficiency, shield machines have gradually begun to adopt the synchronous pushing and splicing function, that is, the shield machine can assemble the pipe segments while excavating. The synchronous pushing and splicing function can realize the continuous construction of the shield machine, and can effectively prevent the blockage of the grouting pipeline and the jamming of the shield body caused by the cessation of the advancement of the assembling pipe segments. In the synchronous pushing and splicing mode, the original 4 shield tail brushes are no longer sufficient to provide the required support for the pipe segments. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a shield tail support reinforcement device suitable for synchronous pushing and assembling of large-diameter shield machines.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A shield tail support reinforcement device suitable for synchronous pushing and assembling of a large-diameter shield comprises: a shield body; a steel plate bundle having a supporting state and a separated state, wherein the steel plate bundle is movably mounted on the inner wall of the shield body to realize switching between the supporting state and the separated state, wherein the steel plate bundle in the supporting state is used to contact with the outer wall of a pipe segment and support the pipe segment; and the steel plate bundle in the separated state is separated from the pipe segment; and a driving assembly mounted on the shield body and used to drive the steel plate bundle to move to realize switching between the supporting state and the separated state.

[0006] Furthermore, the steel plate bundle includes a connecting block and a supporting portion, wherein the supporting portion is used to contact the pipe segment to achieve support; the supporting portion protrudes from the side of the connecting block away from the shield body, and one side of the bottom of the connecting block is hinged to the inner wall of the shield body.

[0007] Furthermore, the driving assembly includes a servo, a rocker and a connecting rod, the servo has a rotatable output shaft, the rotating output shaft is connected to one end of the rocker to drive the rocker and the rotating output shaft to rotate synchronously; the other end of the rocker is hinged to one end of the connecting rod, and the end of the connecting rod away from the rocker is hinged to the connecting block.

[0008] Furthermore, the support portion has a support surface on one side facing the tube segment, and the support surface is used to contact the outer wall of the tube segment.

[0009] Furthermore, multiple groups of the steel plate bundles and the drive assemblies are arranged around the inner wall of the shield body.

[0010] Furthermore, a locking mechanism is further included, and the locking mechanism is used to limit the steel plate bundle in the supporting state so that the steel plate bundle remains in the supporting state.

[0011] Furthermore, the locking mechanism includes a telescopic drive mechanism and a limiting block. The side part of the connecting block has a limiting hole. One side of the telescopic drive mechanism facing the limiting hole has a telescopic rod that can telescopically move. The telescopic rod is connected to the limiting block. In the supporting state, the limiting block is aligned with the limiting hole and can be inserted into the limiting hole under the drive of the telescopic drive mechanism to limit the steel plate bundle in the supporting state.

[0012] Furthermore, there is a gap between the surface of the connecting block in the supporting state facing the shield body and the inner wall of the shield body; a sinking groove with a width smaller than that of the limiting hole is provided at the bottom of the limiting hole. When the limiting block is inserted into the limiting hole on the steel plate bundle in the supporting state, the bottom wall of the limiting block fits with the bottom wall of the limiting hole, and there is a gap between the top wall of the limiting block and the top wall of the limiting hole. A perforation is provided on the limiting block, and a pressing rod is movably inserted through the perforation. A pressing head with a diameter larger than that of the pressing rod is provided at the bottom of the pressing rod, and a compression spring is sleeved on the pressing rod; the upper end of the compression spring abuts against the limiting block, and the lower end abuts against the pressing head; the lower end of the pressing head is used to abut against the bottom wall of the sinking groove to apply an elastic acting force to the connecting block so that the supporting part is closely attached to the segment.

[0013] Furthermore, a limiting structure is connected to the upper end of the pressing rod, and the contour of the limiting structure is larger than that of the perforation. When the lower end of the pressing head abuts against the bottom wall of the sinking groove, there is a gap between the limiting structure and the top wall of the limiting block.

[0014] The present invention also provides a method for strengthening the shield tail support applicable to synchronous pushing and assembling of large-diameter shield tunneling. A steel plate bundle and a drive assembly are installed between the bottom of the shield body and the segment, and the drive assembly drives the steel plate bundle to move to the supporting state to realize the support and strengthening of the segment.

[0015] The present invention has the following beneficial effects:

[0016] This device can improve the continuity and efficiency of shield tunneling construction. Compared with the traditional linear construction mode of pushing one ring and assembling one ring, the construction period is greatly shortened; through the design of the steel plate bundle, this device can contact the outer wall of the segment in the supporting state and provide stronger supporting force to ensure the stability and safety of the segment. The steel plate bundle has a supporting state and a separated state and can be flexibly switched according to construction needs, enabling the shield machine to maintain the best working state in different construction stages.

[0017] In addition to the purposes, features, and advantages described above, the present invention has other purposes, features, and advantages. The present invention will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 is a schematic structural diagram of the segment and the steel plate bundle in an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the cooperation of the segment, the shield body, and the steel plate bundle;

[0021] Figure 3 is a schematic connection structure diagram of the steel plate bundle in a supported state in an embodiment of the present invention;

[0022] Figure 4 is Figure 3 a schematic exploded structural diagram of

[0023] Figure 5 is a cross-sectional view of the connection structure of the steel plate bundle in a supported state;

[0024] Figure 6 is Figure 5 an enlarged view of part A of

[0025] Figure 7 is Figure 6 a partial cross-sectional view taken along line B-B of

[0026] Figure 8 is a schematic structural diagram of the steel plate bundle in a separated state;

[0027] Figure 9 is a schematic structural diagram of the locking mechanism;

[0028] Figure 10 is Figure 9 an enlarged view of part C of

[0029] LEGEND DESCRIPTION:

[0030] Shield body 100, segment 101, tail brush 102;

[0031] Steel plate bundle 200, connection block 210, groove 211, support part 220, support surface 221, limit hole 230, sinking groove 231;

[0032] Drive assembly 300, servo 310, rotary output shaft 311, rocker 320, connecting rod 330;

[0033] Locking mechanism 400, telescopic drive mechanism 410, telescopic rod 411, limit block 420, perforation 421, pressure rod 430, pressure head 431, compression spring 440, limit structure 450, cross bar 460. Detailed implementation mode

[0034] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] Please refer to Figure 1 and Figure 2 , a shield tail support strengthening device applicable to synchronous pushing and assembling of large-diameter shield tunnels provided in a preferred embodiment of the present invention includes a shield body 100, a steel plate bundle 200, and a drive assembly 300.

[0039] The shield body 100 is integrally annular. As Figure 1 shown, a shield tail brush 102 is installed on the shield body, and the rebound force of the shield tail brush is used to provide auxiliary support for the segment 101. The steel plate bundle 200 has a support state and a separation state, and the steel plate bundle 200 is movably installed on the inner wall of the shield body 100 to realize the switching between the support state and the separation state. As Figure 5 shown, the steel plate bundle 200 in the support state is used to contact the outer wall of the segment 101 and support the segment 101. As Figure 8As shown, the steel plate bundle 200 in the separated state is separated from the segment 101, thereby reducing the resistance when relative movement occurs with the segment 101.

[0040] The driving assembly 300 is installed on the shield body 100 and is used to drive the steel plate bundle 200 to move so as to realize the switching between the supporting state and the separated state.

[0041] A shield tail support strengthening device applicable to synchronous pushing and assembling of large-diameter shield tunneling provided by the present invention can improve the continuity and efficiency of shield tunneling construction. Compared with the traditional linear construction mode of pushing one ring and assembling one ring, the construction period is greatly shortened; on the basis of the original shield tail brush of the shield machine, the present invention adds a steel plate bundle, and the number of layers, the arrangement angle and the arrangement gap of the steel plate bundle can all be adjusted according to the working conditions. Through the design of the steel plate bundle 200, it can contact the outer wall of the segment 101 and provide stronger supporting force in the supporting state, ensuring the stability and safety of the segment 101. The steel plate bundle 200 has a supporting state and a separated state, and can be flexibly switched according to the construction needs, so that the shield machine can maintain the best working state in different construction stages.

[0042] Refer to Figure 3 In some embodiments of the present invention, the steel plate bundle 200 includes a connecting block 210 and a supporting portion 220. The supporting portion 220 is used to contact the segment 101 to achieve support; the supporting portion 220 protrudes from the side of the connecting block 210 facing away from the shield body 100, so that an obtuse angle is formed between the supporting portion 220 and the connecting block 210. When the supporting portion 220 contacts the segment 101, the connecting block 210 is close to the shield body 100, thereby facilitating the connection with the driving assembly 300 on the inner wall of the shield body 100. One side of the bottom of the connecting block 210 is hinged to the inner wall of the shield body 100, so as to realize rotational movement to achieve state switching.

[0043] Refer to Figure 3 and Figure 4 In a further embodiment of the present invention, the driving assembly 300 includes a steering gear 310, a rocker 320 and a connecting rod 330. The steering gear 310 has a rotatable output shaft 311. The output shaft 311 is connected to one end of the rocker 320 to drive the rocker 320 to rotate synchronously with the output shaft 311; the other end of the rocker 320 is hinged to one end of the connecting rod 330. The end of the connecting rod 330 away from the rocker 320 is hinged to the connecting block 210. The connecting block 210 is provided with an embedding groove 211 for the connecting rod 330 to be embedded. Corresponding holes are provided on the side wall of the embedding groove and the connecting rod 330 to realize hinge connection through a hinge shaft. Through the transmission of the rocker 320 and the connecting rod 330, the steel plate bundle 200 can be driven to rotate around the hinge point with the shield body 100.

[0044] Refer to Figure 4 and Figure 5, in a further embodiment of the present invention, the side of the support portion 220 facing the segment 101 has a support surface 221, and the support surface 221 is used to contact the outer wall of the segment 101, so as to achieve surface contact, increase the contact area, avoid stress concentration, and improve the support stability.

[0045] Refer to Figure 1 and Figure 2 , in a further embodiment of the present invention, multiple groups of the steel plate bundle 200 and the driving assembly 300 are arranged around the inner wall of the shield body 100, so as to achieve multi-position and multi-group support, improve the support force and support stability. Of course, it can be understood that the steel plate bundle 200 and the driving assembly 300 are arranged around the bottom area of the shield body 100.

[0046] Refer to Figure 3 and Figure 5 , in a further embodiment of the present invention, a locking mechanism 400 is further included. The locking mechanism 400 is used to limit the steel plate bundle 200 in the supporting state, so that the steel plate bundle 200 remains in the supporting state. After the driving assembly 300 drives the steel plate bundle 200 to switch to the supporting state, the driving assembly 300 can stop working, and the locking mechanism 400 is used to keep the steel plate bundle 200 in the supporting state. Moreover, the force received by the steel plate bundle 200 will not be all transmitted to the driving assembly 300, avoiding damage to the driving assembly 300 due to long-term exposure to large forces in the idle state and improving the service life of the equipment.

[0047] Refer to Figure 3 and Figure 5 , in a further embodiment of the present invention, the locking mechanism 400 includes a telescopic driving mechanism 410 and a limiting block 420. The side of the connecting block 210 has a limiting hole 230. The side of the telescopic driving mechanism 410 facing the limiting hole 230 has a telescopic rod 411 that can telescopically move. The telescopic driving mechanism 410 can be a hydraulic cylinder, a telescopic motor, etc., and can drive the telescopic rod 411 to telescopically move. The telescopic rod 411 is connected to the limiting block 420 to drive the limiting block 420 to telescopically move. In the supporting state, the limiting block 420 is aligned with the limiting hole 230 and can be inserted into the limiting hole 230 under the drive of the telescopic driving mechanism 410 to limit the steel plate bundle 200 in the supporting state, so as to keep the steel plate bundle 200 in the supporting state and achieve stable support. And when unlocking is required, only the telescopic driving mechanism 410 needs to drive the limiting block 420 to withdraw from the limiting hole 230, and the locking and unlocking can be automatically realized.

[0048] Refer to Figure 6 , Figure 7 , Figure 9 and Figure 10, in a further embodiment of the present invention, a sinking groove 231 with a width smaller than that of the limit hole 230 is provided at the bottom of the limit hole 230. When the limit block 420 is inserted into the limit hole 230 on the steel plate bundle 200 in a supported state, the bottom wall of the limit block 420 fits against the bottom wall of the limit hole 230, so that the connecting block 210 cannot rotate upward, that is, the supporting part 220 will not move in the direction of separating from the segment 101, thereby realizing stable support. As Figure 6 shown, there is a gap between the top wall of the limit block 420 and the top wall of the limit hole 230, and there is a gap between the side of the connecting block 210 facing the shield 100 in the supported state and the inner wall of the shield 100. A through hole 421 is provided on the limit block 420, and a pressure rod 430 is movably inserted through the through hole 421. The diameter of the pressure rod 430 is adapted to the through hole 421. A pressure head 431 with a diameter larger than that of the pressure rod 430 is provided at the bottom of the pressure rod 430. The contour of the pressure head 431 is larger than the through hole 421. A compression spring 440 is sleeved on the pressure rod 430; the upper end of the compression spring 440 abuts against the limit block 420, and the lower end abuts against the pressure head 431 to apply a downward elastic force to the pressure rod 430; when the limit block 420 is embedded in the limit hole 230 in the supported state, the lower end of the pressure head 431 abuts against the bottom wall of the sinking groove 231 to apply an elastic force to the connecting block 210, so that the supporting part 220 is in close contact with the segment 101. There is a gap between the top wall of the limit block 420 and the top wall of the limit hole 230, and there is a gap between the side of the connecting block 210 facing the shield 100 in the supported state and the inner wall of the shield 100, so that the connecting block 210 has a space to move further closer to the shield 100. When the connecting block 210 moves further closer to the shield 100, the supporting part 220 will be in close contact with the segment 101. Then, the compression spring 440 and the pressure head 431 are used to apply an elastic force to the connecting block 210 to make the connecting block 210 have a tendency to move further closer to the shield 100, so that the supporting part 220 is in close contact with the segment 101, realizing a certain elastic preloading effect.

[0049] Referring to Figure 6 , Figure 7 , Figure 9 and Figure 10, in a further embodiment of the present invention, a limiting structure 450 is connected to the upper end of the pressure rod 430. The contour of the limiting structure 450 is larger than that of the through hole 421. When the lower end of the pressing head 431 abuts against the bottom wall of the sinking groove 231, there is a gap between the limiting structure 450 and the top wall of the limiting block 420, so as to prevent the acting force of the compression spring 440 from being transmitted to the limiting block 420 through the limiting structure 450, so that the acting force does not act entirely on the connecting block 210, thus causing the compression spring 440 to lose its function. The limiting structure 450 can be a nut threadedly connected to the upper end of the pressure rod 430. It can be understood that in order for the limiting block 420 to be smoothly inserted into the limiting hole 230 and the pressing head 431 to be smoothly inserted into the sinking groove 231, chamfers are provided at the end of the limiting block 420 and the bottom of the pressing head 431, and chamfers can also be provided at the bottom edge of the sinking groove 231.

[0050] Referring to Figure 9 , a plurality of limiting blocks 420 are arranged horizontally, and the plurality of limiting blocks 420 are connected in series by a cross bar 460. The cross bar 460 and the telescopic rod 411 can be fixedly connected by fasteners.

[0051] The present invention also provides a method for strengthening the shield tail support applicable to the synchronous pushing and assembling of large-diameter shield machines. A steel plate bundle 200 and a driving assembly 300 are installed between the bottom of the shield body 100 and the segment 101. The driving assembly 300 drives the steel plate bundle 200 to move to a supporting state to realize the support and strengthening of the segment 101.

[0052] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A shield tail support reinforcement device suitable for synchronous pushing and assembling of large-diameter shield machines, characterized in that: include: Shield(100); The steel plate bundle (200) has a supporting state and a separated state. The steel plate bundle (200) is movably mounted on the inner wall of the shield body (100) to achieve switching between the supporting state and the separated state. The steel plate bundle (200) in the supporting state is used to contact the outer wall of the pipe segment (101) and support the pipe segment (101); the steel plate bundle (200) in the separated state is separated from the pipe segment (101); A driving assembly (300) is mounted on the shield body (100) and is used to drive the steel plate bundle (200) to move so as to switch between a supporting state and a separated state; The steel plate bundle (200) comprises a connecting block (210) and a supporting portion (220), wherein the supporting portion (220) is used to contact with a pipe segment (101) to achieve support; the supporting portion (220) protrudes from a side of the connecting block (210) away from the shield body (100), and a bottom side of the connecting block (210) is hinged to an inner wall of the shield body (100); the driving assembly (300) comprises a steering gear (310), a rocking arm (320) and a connecting rod (330), wherein the steering gear (310) has a rotating output shaft (311) that can rotate, and the rotating output shaft (311) is connected to one end of the rocking arm (320) to drive the rocking arm (320) and the rotating output shaft (311) to rotate synchronously; the other end of the rocking arm (320) is hinged to one end of the connecting rod (330), and an end of the connecting rod (330) away from the rocking arm (320) is hinged to the connecting block (210).

2. The shield tail support reinforcement device suitable for synchronous pushing and assembling of large-diameter shield machines according to claim 1 is characterized in that: The support portion (220) has a support surface (221) on one side facing the tube segment (101), and the support surface (221) is used to contact the outer wall of the tube segment (101).

3. The shield tail support reinforcement device suitable for synchronous pushing and assembling of large-diameter shield machines according to claim 1 is characterized in that: The steel plate bundles (200) and the drive components (300) are arranged in multiple groups around the inner wall of the shield body (100).

4. The shield tail support reinforcement device suitable for synchronous pushing and assembling of large-diameter shield machines according to claim 1 is characterized in that: It also includes a locking mechanism (400), wherein the locking mechanism (400) is used to limit the position of the steel plate bundle (200) in the supporting state, so that the steel plate bundle (200) remains in the supporting state.

5. The shield tail support reinforcement device suitable for synchronous pushing and assembling of large-diameter shield machines according to claim 4 is characterized in that: The locking mechanism (400) comprises a telescopic drive mechanism (410) and a limit block (420); a side of the connection block (210) is provided with a limit hole (230); a side of the telescopic drive mechanism (410) facing the limit hole (230) is provided with a telescopic rod (411) that is telescopically movable; the telescopic rod (411) is connected to the limit block (420); in a supported state, the limit block (420) is aligned with the limit hole (230) and can be inserted into the limit hole (230) under the drive of the telescopic drive mechanism (410) to limit the steel plate bundle (200) in the supported state.

6. The shield tail support reinforcement device suitable for synchronous pushing and assembling of large-diameter shield machines according to claim 5 is characterized in that: The side of the connecting block (210) in the supporting state facing the shield body (100) has a gap with the inner wall of the shield body (100); the bottom of the limiting hole (230) is provided with a sinking groove (231) whose width is smaller than that of the limiting hole (230); when the limiting block (420) is inserted into the limiting hole (230) on the steel plate bundle (200) in the supporting state, the bottom wall of the limiting block (420) is in contact with the bottom wall of the limiting hole (230); the top wall of the limiting block (420) has a gap with the top wall of the limiting hole (230); and the limiting block (420) is provided with a through hole ( 421), a pressure rod (430) is movably inserted into the through hole (421), a pressure head (431) having a diameter larger than that of the pressure rod (430) is provided at the bottom of the pressure rod (430), and a pressure spring (440) is sleeved on the pressure rod (430); the upper end of the pressure spring (440) abuts against the limit block (420), and the lower end abuts against the pressure head (431); the lower end of the pressure head (431) is used to abut against the bottom wall of the sinking groove (231) to apply an elastic force to the connection block (210), so that the support portion (220) and the pipe segment (101) are in close contact.

7. The shield tail support reinforcement device suitable for synchronous pushing and assembling of large-diameter shield machines according to claim 6 is characterized in that: The upper end of the pressure rod (430) is connected to a limiting structure (450), the contour of the limiting structure (450) is larger than the perforation (421), and when the lower end of the pressure head (431) abuts against the bottom wall of the sinking groove (231), a gap exists between the limiting structure (450) and the top wall of the limiting block (420).

8. A method for strengthening the tail support of a large-diameter shield machine for synchronous assembly, based on the tail support strengthening device according to any one of claims 1 to 7, characterized in that: A steel plate bundle (200) and a driving assembly (300) are installed between the bottom of the shield body (100) and the pipe segment (101), and the driving assembly (300) drives the steel plate bundle (200) to move to a supporting state, so as to achieve support and reinforcement of the pipe segment (101).

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