Shield lateral starting counter-force device

Abstract

The utility model discloses a lateral starting counter-force device for a shield. The lateral starting counter-force device comprises a reference circular ring, the reference circular ring is arranged at the end of the shield negative ring segment, and the plane where the reference circular ring is located is perpendicular to the propelling axis of a shield tunneling machine. A plurality of straight supports are uniformly distributed on the outer circumference of the reference circular ring, one end of each straight support is fixedly connected with the bottom of the pilot tunnel expansion groove, and the other end of each straight support is vertically fixed with the outer circumferential surface of the reference circular ring; the multiple inclined struts are evenly distributed on the first end face of the reference circular ring and obliquely arranged between the first end face of the reference circular ring and the tunnel wall of the underground excavation starting pilot tunnel. The second end face of the reference circular ring is in close contact with the end face of the shield negative ring duct piece, and the reference circular ring and the shield negative ring duct piece are fixedly connected through a plurality of duct piece connecting bolts; the device is simple in structure and small in occupied space, the shield negative ring duct piece is prevented from making direct contact with the transverse channel end wall, the shield position gap in the launching process is greatly reduced, and the shield negative ring duct piece is prevented from being broken or fractured.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield construction, and particularly relates to a shield lateral initial reaction force device. Background Art

[0002] The shield lateral movement starting technology is a method of digging a temporary shaft on the side of the road, setting up a horizontal channel from the underground through the temporary shaft and extending it to under the road, and then sending the shield machine underground through the horizontal channel for starting construction; when the shield machine starts in the horizontal channel, the traditional starting reaction frame cannot be used normally due to the insufficient clearance size of the horizontal channel structure; the reasons are as follows: when the traditional starting reaction frame is used for reaction support, the thrust generated by the shield machine excavation will directly act on the end wall structure of the horizontal channel; affected by the verticality of the end wall structure of the horizontal channel, the close fit between the shield negative ring segment and the end wall of the horizontal channel often cannot meet the requirements, resulting in the shield position gap exceeding the limit during the starting process, causing large-scale damage and breakage of the shield negative ring segment. Utility Model Content

[0003] In view of the technical problems existing in the prior art, the utility model provides a shield lateral initial reaction force device to solve the technical problem that the traditional initial reaction force frame cannot be used normally due to insufficient clearance size of the transverse channel structure.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] The utility model provides a shield lateral initial reaction force device, which is arranged in a dark excavation initial guide tunnel and comprises a reference ring, a plurality of straight supports, a plurality of oblique supports and a plurality of pipe segment connecting bolts;

[0006] The tunnel wall surface of the dark excavation initial guide tunnel is provided with a guide tunnel expansion groove, and the guide tunnel expansion groove is arranged along the circumference of the tunnel wall of the dark excavation initial guide tunnel; wherein the guide tunnel expansion groove is arranged close to one side of the end of the shield negative ring segment, and the notch of the guide tunnel expansion groove is arranged toward the center of the dark excavation initial guide tunnel;

[0007] The reference circular ring is arranged at the end of the shield negative ring segment, and the plane of the reference circular ring is perpendicular to the propulsion axis of the shield machine; a plurality of the straight supports are evenly arranged on the outer circumference of the reference circular ring, one end of the straight support is fixedly connected to the bottom of the guide tunnel expansion groove, and the other end of the straight support is vertically fixed to the outer circumference of the reference circular ring;

[0008] A number of inclined braces are evenly arranged on the first end face of the reference circular ring and are inclined between the first end face of the reference circular ring and the wall of the mined starting pilot tunnel; the second end face of the reference circular ring is in close contact with the end face of the shield negative ring segment, and a number of segment connection bolts are used to fixedly connect the reference circular ring and the shield negative ring segment.

[0009] Further, the reference circular ring includes a number of reference arc blocks; the reference arc blocks are all arc structures, and a number of the reference arc blocks are spliced end to end in sequence to form the reference circular ring; wherein, adjacent two of the reference arc blocks are fixedly connected by arc block connection bolts.

[0010] Further, the outer diameter dimension of the reference circular ring is larger than the outer diameter dimension of the shield negative ring segment.

[0011] Further, the straight brace includes a straight brace body and a buried steel plate; the buried steel plate is anchored on the bottom surface of the enlarged groove of the pilot tunnel, and the straight brace body is arranged along the radial direction of the reference circular ring; wherein, the first end of the straight brace body is vertically fixed to the outer circumferential surface of the reference circular ring, and the second end of the straight brace body is fixedly connected to the outer surface of the buried steel plate.

[0012] Further, the buried steel plate is anchored on the bottom surface of the enlarged groove of the pilot tunnel by straight brace anchor bolts; wherein, the anchoring end of the straight brace anchor bolt is fixed in the bedrock inside the bottom of the enlarged groove of the pilot tunnel; the exposed end of the support anchor bolt penetrates through the buried steel plate and is fixedly connected to the buried steel plate by an anchor bolt fixing nut.

[0013] Further, the straight brace further includes a fixing steel plate, and the fixing steel plate is arranged between the straight brace body and the outer circumferential surface of the reference circular ring; wherein, the fixing steel plate is fixed on the outer circumferential surface of the reference circular ring by high-strength bolts, and the first end of the straight brace body is vertically fixed on the surface of the fixing steel plate.

[0014] Further, a number of arc-shaped bolt holes are preset at the end of the shield negative ring segment, and the number of the arc-shaped bolt holes are evenly arranged at the end of the shield negative ring segment; wherein, one end of the arc-shaped bolt hole penetrates through the end face of the shield negative ring segment, and the other end of the arc-shaped bolt hole bends and extends towards the inner wall direction of the shield negative ring segment and penetrates through the inner wall surface of the shield negative ring segment;

[0015] The segment connection bolt is an arc-shaped bolt, and the outer shape of the segment connection bolt is the same as the structure of the arc-shaped bolt hole; wherein, the first end of the segment connection bolt is embedded in the second end face of the reference ring, and the second end of the segment connection bolt penetrates through the arc-shaped bolt hole and extends to the outside of the inner wall surface of the shield negative ring segment.

[0016] Further, the second end of the segment connection bolt is fixedly connected to the inner wall surface of the shield negative ring segment through a segment fixing nut.

[0017] Further, one end of the inclined strut is supported on the side wall of the mined starting pilot tunnel and is arranged close to the notch of the pilot tunnel expansion slot; the other end of the inclined strut is fixedly connected to the first end face of the reference ring through a high-strength bolt.

[0018] Further, the left-right deviation of the reference ring is controlled within ±10 mm, the elevation deviation of the reference ring is controlled within ±5 mm, and the up-down deviation of the reference ring is controlled within ±10 mm.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] The present utility model provides a shield lateral starting reaction force device, which sets a reference ring at the end of the shield negative ring segment, fixes the reference ring by using a straight strut and an inclined strut, and fixes the reference ring and the shield negative ring segment by using a segment connection bolt, so as to realize providing a reaction force support for the shield negative ring segment by using the reference ring. The device has a simple structure, occupies a small space, and avoids the direct contact between the shield negative ring segment and the cross passage end wall, greatly reducing the shield position gap during the starting process and avoiding the breakage or fracture of the shield negative ring segment. Description of the Drawings

[0021] Figure 1 It is a longitudinal sectional view of the shield lateral starting reaction force device described in the present utility model;

[0022] Figure 2 It is a front view of the shield lateral starting reaction force device described in the present utility model;

[0023] Figure 3 It is a schematic connection structure diagram of the reference ring, the straight strut and the inclined strut in the present utility model.

[0024] Wherein, 1 is the reference ring, 2 is the straight strut, 3 is the straight strut anchor bolt, 4 is the inclined strut, 5 is the segment connection bolt, 6 is the pilot tunnel expansion slot, 7 is the mined starting pilot tunnel, 8 is the shield negative ring segment; 11 is the reference arc block, 12 is the arc block connection bolt. Detailed Embodiment

[0025] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer and more understandable, the following specific embodiments are used to further elaborate on the present utility model in detail. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] As shown in the Figure 1-2 accompanying drawings, the present utility model provides a shield side launching reaction device, which is arranged in the mined starting pilot tunnel 7 and is used to provide reaction support for the shield negative segment 8. Among them, a pilot tunnel expansion groove 6 is arranged on the wall surface of the mined starting pilot tunnel 7, and the pilot tunnel expansion groove 6 is arranged circumferentially along the wall of the mined starting pilot tunnel. Among them, the pilot tunnel expansion groove 6 is arranged on one side of the end close to the shield negative segment 8. The pilot tunnel expansion groove 6 is a U-shaped open groove structure, the notch of the pilot tunnel expansion groove 6 faces the center of the mined starting pilot tunnel 7, and the bottom of the pilot tunnel expansion groove 6 is parallel to the wall surface of the mined starting pilot tunnel 7. The shield side launching reaction device includes a reference ring 1, a plurality of straight struts 2, a plurality of straight strut bolts 3, a plurality of inclined struts 4 and segment connection bolts 5.

[0027] The reference ring 1 is arranged at the end of the shield negative segment 8. The plane where the reference ring 1 is located is perpendicular to the propulsion axis of the shield machine and is parallel to the plane where the pilot tunnel expansion groove 6 is located. Among them, the outer diameter of the reference ring 1 is larger than the outer diameter of the shield negative segment 8. A plurality of the straight struts 2 are evenly arranged on the outer circumferential surface of the reference ring 1. One end of the straight strut 2 is fixedly connected to the bottom of the pilot tunnel expansion groove 6, and the other end of the straight strut 2 is fixedly perpendicular to the outer circumferential surface of the reference ring 1.

[0028] The reference ring 1 is a circular ring structure and includes a plurality of reference arc blocks 11. A plurality of the reference arc blocks 11 are all arc structures, and a plurality of the reference arc blocks 11 are spliced end to end in sequence to form the reference ring 1. That is, a plurality of the reference arc blocks 11 are spliced end to end in sequence to form a circular ring structure. Among them, adjacent two of the reference arc blocks 11 are fixedly connected by an arc block connection bolt 12, and the arc block connection bolt 12 uses a high-strength bolt. Preferably, the number of the reference arc blocks 11 is four, and each of the reference arc blocks 11 is a 1 / 4 arc structure.

[0029] The straight strut 2 includes a straight strut body, a pre-embedded steel plate and a fixing steel plate. The support body is uniformly arranged on the outer circumferential surface of the reference ring 1 and is arranged along the radial direction of the reference ring 1. The fixing steel plate is vertically fixed at the first end of the support body, and the pre-embedded steel plate is vertically fixed at the second end of the straight strut body. Among them, the pre-embedded steel plate is anchored on the bottom surface of the groove of the pilot tunnel expansion groove 6, and the pre-embedded steel plate is anchored on the bottom surface of the groove of the pilot tunnel expansion groove 6 through the straight strut anchor bolt 3. Specifically, the anchoring end of the straight strut anchor bolt 3 is fixed in the bedrock inside the bottom of the pilot tunnel expansion groove 6. The pre-embedded steel plate is provided with anchoring screw holes. The exposed end of the support anchor bolt 3 passes through the anchoring screw holes on the pre-embedded steel plate and is fixedly connected with the pre-embedded steel plate through an anchor bolt fixing nut. Among them, an anchor bolt gasket is also arranged between the anchor bolt fixing nut and the pre-embedded steel plate. The fixing steel plate is arranged between the support body and the outer circumferential surface of the reference ring 1, and the fixing steel plate is fixedly installed on the outer circumferential surface of the reference ring 1 through high-strength bolts. The first end of the straight strut body is vertically fixed on the surface of the fixing steel plate.

[0030] A plurality of the inclined struts 4 are uniformly arranged on the first end face of the reference ring 1 and are inclined between the first end face of the reference ring 1 and the wall of the mined starting pilot tunnel 7. Among them, one end of the inclined strut 4 is directly supported on the side wall of the mined starting pilot tunnel 7 and is arranged close to the notch of the pilot tunnel expansion groove 6. The other end of the inclined strut 4 is fixedly connected to the first end face of the reference ring 1 through high-strength bolts.

[0031] The second end face of the reference ring 1 is in close contact with the end face of the shield negative ring segment 8, and the reference ring 1 and the shield negative ring segment 8 are fixedly connected by a plurality of segment connection bolts 5. Specifically, a plurality of arc-shaped bolt holes are preset at the end of the shield negative ring segment 8, and the plurality of arc-shaped bolt holes are uniformly arranged at the end of the shield negative ring segment 8. Among them, one end of the arc-shaped bolt hole penetrates through the end face of the shield negative ring segment 8, and the other end of the arc-shaped bolt hole bends and extends towards the inner wall direction of the shield negative ring segment 8 and penetrates through the inner wall surface of the shield negative ring segment 8. The segment connection bolt 5 is an arc-shaped bolt, and the outer shape of the segment connection bolt 5 is the same as the structure of the arc-shaped bolt hole. Among them, the first end of the segment connection bolt 5 is pre-embedded in the second end face of the reference ring 1, and the second end of the segment connection bolt 5 passes through the arc-shaped bolt hole and extends to the outside of the inner wall surface of the shield negative ring segment 8. Preferably, the second end of the segment connection bolt 5 is fixedly connected to the inner wall surface of the shield negative ring segment 8 through a segment fixing nut.

[0032] Installation process:

[0033] The shield lateral initial reaction force device described in the utility model comprises the following steps when being installed:

[0034] Step 1: After the trolley is hoisted and translated, the shield machine is pushed as a whole by using a rail clamping cylinder until the shield body of the shield machine enters the dark excavation starting guide tunnel 7; then, the sub-components of the shield lateral starting reaction force device are transported to the dark excavation starting guide tunnel 7 for installation; wherein, a guide tunnel expansion groove 6 is pre-opened on the wall of the dark excavation starting guide tunnel 7.

[0035] Step 2: Install a lifting steel plate on the arch top of the guide hole expansion groove 6, and weld a lifting lug on the lifting steel plate; wherein the lifting lug and the lifting steel plate are fixed by double-sided welding.

[0036] Step 3, suspend the fall chain on the lifting ear, use the fall chain to lift the reference arc block 11 of the upper part of the reference circular ring 1 to the designed position, and then use the arc block connecting bolts 12 to fix the reference arc blocks 11 of the upper part of the reference circular ring 1 together; then, install the reference arc blocks of the lower part of the reference circular ring 1 on the upper part of the reference circular ring 1, and use the arc block connecting bolts 12 to fix all the reference arc blocks 11 together to form a complete reference circular ring 1.

[0037] Step 4: measure and locate the elevation and position of the reference ring 1, and adjust the position of the reference ring 1 to the designed position.

[0038] Step 5, use the straight support 2 and the diagonal support 4 to fix the reference ring 1, and the lateral starting reaction device of the shrinking shield is now installed; wherein, the diagonal support 4 uses 20-type steel; it should be noted that when the reference ring 1 is fixed, the verticality is first corrected in both directions with a theodolite so that the plane where the reference ring 1 is located is perpendicular to the propulsion axis of the shield machine; when installing the reference ring 1, the left and right deviations of the reference ring 1 are controlled within ±10mm, the elevation deviation of the reference ring 1 is controlled within ±5mm, and the up and down deviations of the reference ring 1 are controlled within ±10mm.

[0039] Step 6, push the shield negative ring segment 8 against the second end face of the reference circular ring 1, and observe whether the shield negative ring segment 8 and the reference circular ring 1 are tightly fitted; then, use the segment connecting bolts 5 to fix the shield negative ring segment 8 and the reference circular ring 1 together.

[0040] It should be noted that when using the shield side launching reaction device to provide reaction support for the shield negative segment, after the shield machine starts, by monitoring the safety of the reaction device, observing the bending deformation of the inclined strut, the sliding dislocation of the embedded steel plate, and the inclination of the reference ring, etc.; among them, the shield launching thrust needs to be less than 1000t, and the perpendicularity of the reference ring 1 is monitored in real time.

[0041] In the present utility model, the reference ring 1 is formed by sequentially splicing a plurality of reference arc blocks 11, and adjacent two reference arc blocks 11 are fixedly connected together by arc block connecting bolts 12; the straight strut 2 is arranged along the outer circumferential direction of the reference ring 1, and the reference ring 1 is fixedly connected to the bottom of the guide hole expansion groove 6 by using the straight strut 2, so as to realize the circumferential positioning and fixing of the reference ring 1 by the straight strut 2; by arranging an inclined strut 4 between the first end face of the reference ring 1 and the wall of the mined starting guide hole 7, the inclined strut 4 is used to provide axial positioning and fixing for the reference ring 1; the outer diameter of the reference ring 1 is designed to be larger than the outer diameter of the shield negative segment 8, so that the shield negative segment 8 can be in close contact with the reference ring 1, and the shield negative segment 8 is connected to the reference ring 1 by segment connecting bolts 5, so as to realize that the shield negative segment 8 directly acts on the reference ring 1, and then the reference ring 1 is used to provide reaction support for the shield negative segment 8, greatly reducing the shield position gap during the starting process and avoiding large-area damage and fracture of the shield negative segment; at the same time, it can effectively reduce the deformation and displacement of the reference ring.

[0042] The shield side launching reaction device of the present utility model has a simple device structure, light weight, reliable structural strength and stiffness, and small occupied space; it is convenient to manufacture and install, each component is assembled, and can be disassembled, recycled and reused after use, saving material costs and labor costs, and fully reflecting economy and practicability.

[0043] The above embodiments are only one of the implementation manners capable of realizing the technical solution of the present utility model. The scope of protection required by the present utility model is not limited only by this embodiment, but also includes any changes, substitutions and other implementation manners that are easily conceivable by any person skilled in the art within the technical scope disclosed by the present utility model.

Claims

1. A shield lateral initial reaction force device, characterized in that: The shield lateral initial reaction force device is arranged in a dark excavation initial guide tunnel (7), and comprises a reference ring (1), a plurality of straight supports (2), a plurality of diagonal supports (4) and a plurality of pipe segment connecting bolts (5); The tunnel wall surface of the dark excavation starting guide tunnel (7) is provided with a tunnel expansion groove (6), and the tunnel expansion groove (6) is arranged along the circumference of the tunnel wall of the dark excavation starting guide tunnel; wherein the tunnel expansion groove (6) is arranged close to one side of the end of the shield negative ring segment (8), and the notch of the tunnel expansion groove (6) is arranged toward the center of the dark excavation starting guide tunnel (7); The reference circular ring (1) is arranged at the end of the shield negative ring segment (8), and the plane of the reference circular ring (1) is perpendicular to the propulsion axis of the shield machine; a plurality of the straight supports (2) are evenly arranged on the outer circumference of the reference circular ring (1), one end of the straight support (2) is fixedly connected to the bottom of the guide tunnel expansion groove (6), and the other end of the straight support (2) is vertically fixed to the outer circumference of the reference circular ring (1); A plurality of the diagonal braces (4) are evenly arranged on the first end face of the reference circular ring (1), and are obliquely arranged between the first end face of the reference circular ring (1) and the wall of the dark excavation starting guide tunnel (7); the second end face of the reference circular ring (1) is in close contact with the end face of the shield negative ring segment (8), and the reference circular ring (1) and the shield negative ring segment (8) are fixedly connected by a plurality of segment connecting bolts (5).

2. A shield lateral initial reaction force device according to claim 1, characterized in that: The reference circular ring (1) comprises a plurality of reference circular arc blocks (11); the reference circular arc blocks (11) are all circular arc structures, and the plurality of reference circular arc blocks (11) are sequentially spliced ​​end to end to form the reference circular ring (1); wherein two adjacent reference circular arc blocks (11) are fixedly connected by circular arc block connecting bolts (12).

3. A shield lateral initial reaction force device according to claim 1, characterized in that: The outer diameter of the reference circular ring (1) is greater than the outer radial dimension of the shield negative ring segment (8).

4. A shield lateral initial reaction force device according to claim 1, characterized in that: The straight support (2) comprises a straight support body and an embedded steel plate; the embedded steel plate is anchored on the bottom surface of the guide hole expansion groove (6), and the straight support body is arranged along the radial direction of the reference ring (1); wherein the first end of the straight support body is vertically fixed to the outer circumferential surface of the reference ring (1), and the second end of the straight support body is fixedly connected to the outer surface of the embedded steel plate.

5. A shield lateral initial reaction force device according to claim 4, characterized in that: The embedded steel plate is anchored to the bottom surface of the guide tunnel expansion groove (6) by a support anchor rod (3); wherein the anchoring end of the support anchor rod (3) is fixed in the bedrock inside the bottom of the guide tunnel expansion groove (6); the exposed end of the support anchor rod (3) passes through the embedded steel plate, and the exposed end of the support anchor rod (3) is fixedly connected to the embedded steel plate by an anchor rod fixing nut.

6. A shield lateral initial reaction force device according to claim 4, characterized in that: The straight support (2) also includes a fixed steel plate, which is arranged between the straight support body and the outer circumferential surface of the reference ring (1); wherein the fixed steel plate is fixed to the outer circumferential surface of the reference ring (1) by high-strength bolts, and the first end of the straight support body is vertically fixed to the surface of the fixed steel plate.

7. A shield lateral initial reaction force device according to claim 1, characterized in that: A plurality of arc-shaped bolt holes are preset at the end of the shield negative ring segment (8), and the plurality of arc-shaped bolt holes are evenly distributed at the end of the shield negative ring segment (8); wherein one end of the arc-shaped bolt hole penetrates the end surface of the shield negative ring segment (8), and the other end of the arc-shaped bolt hole bends and extends toward the inner wall direction of the shield negative ring segment (8), and penetrates the inner wall surface of the shield negative ring segment (8); The segment connection bolt (5) is an arc-shaped bolt, and the shape of the segment connection bolt (5) is the same as the structure of the arc-shaped bolt hole; wherein the first end of the segment connection bolt (5) is pre-buried in the second end face of the reference circular ring (1), and the second end of the segment connection bolt (5) is arranged through the arc-shaped bolt hole and extends to the outside of the inner wall surface of the shield negative ring segment (8).

8. A shield lateral initial reaction force device according to claim 7, characterized in that: The second end of the segment connecting bolt (5) is fixedly connected to the inner wall surface of the shield negative ring segment (8) via a segment fixing nut.

9. A shield lateral initial reaction force device according to claim 1, characterized in that: One end of the diagonal brace (4) is supported on the side wall of the dark excavation starting guide tunnel (7) and is arranged close to the notch of the guide tunnel expansion groove (6); the other end of the diagonal brace (4) is fixedly connected to the first end face of the reference circular ring (1) by a high-strength bolt.

10. A shield lateral initial reaction force device according to claim 1, characterized in that: The left-right deviation of the reference circular ring (1) is controlled within ±10 mm, the elevation deviation of the reference circular ring (1) is controlled within ±5 mm, and the up-down deviation of the reference circular ring (1) is controlled within ±10 mm.

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