A shield shell for an ultra-large diameter tunnel boring machine, auxiliary welding fixtures and welding method

Abstract

The present invention discloses a shield body shell of an ultra-large diameter shield machine, an auxiliary welding tool and a welding method. The shield body shell includes a front middle shield block 1, a front middle shield block 2, a front middle shield block 3, a front middle shield block 4, a front middle shield block 5, a front middle shield block 6, a front middle shield block 7, a front middle shield block 8 and eight pairs of symmetrically processed connecting plates. One side of the front middle shield block 2 is connected to the front middle shield block 1 through a connecting plate bolt and nut, and the other side is connected to the front middle shield block 3 through a connecting plate bolt and nut; and the rest are analogous. The auxiliary welding tool is a U-shaped welding block, with symmetrical grooves processed on both sides, which are respectively welded on the outer arc surfaces of the shell 1 and the shell 2. The present invention uses auxiliary welders to weld and assemble the eight front middle shield bodies, thereby ensuring the concentricity of the arcs; the auxiliary welding tool has a small size per piece, is relatively convenient to install and dismantle, and has good practicality.

Description

Technical Field

[0001] The invention relates to a shield body shell of an ultra-large diameter shield machine and an auxiliary welding tool and a welding method thereof, belonging to the technical field of tunnel engineering machinery. Background Art

[0002] The shield machine is a special engineering machinery for tunnel excavation. The basic principle is that a cylindrical steel component is pushed forward along the axis of the tunnel while excavating the soil. The shield shell plays a temporary support role for the excavated part of the tunnel that has not been lined yet, and bears the pressure of the surrounding soil layer. Sometimes it also bears the pressure of groundwater and needs to keep groundwater out. Excavation, soil discharge, and masonry repair operations are carried out under the support and protection of the shield shell. In recent years, with the continuous changes in engineering needs, large-diameter shield machines have played a pivotal role in key projects. The size of the conventional shield shell is generally controlled at about 6500mm. The front shield, the front of the middle shield, and the rear of the middle shield are generally divided into two pieces. After cutting and processing, the two shells are welded together. The partition (flange) welded to the shell is also divided into two pieces accordingly. After cutting and processing, they are welded together, and then welded as a whole to the corresponding shell position. Therefore, the shield part of the conventional shield machine belongs to the overall welding, and the processing and installation are only made in blocks of special parts, then assembled and welded, and then processed. Due to the limitation of its large diameter, the shield shell part cannot be processed and produced as a whole machine, so it is imperative to process the shield machine shell in blocks. Therefore, ensuring the welding and assembly of multiple shells is an important part of completing the ultra-large diameter shield machine. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a shield shell of a super-large diameter shield machine and its auxiliary welding tooling and method in view of the defects of the prior art. The present invention divides the front middle shield of the super-large diameter shield machine into 8 parts, each of which is cut, welded, processed and assembled separately, and then connected with other blocks through a connecting plate, and no longer distinguishes between the front shield, the front middle shield and the rear middle shield.

[0004] To solve this technical problem, the present invention provides a shield body shell of an ultra-large diameter shield machine, comprising a front middle shield block one, a front middle shield block two, a front middle shield block three, a front middle shield block four, a front middle shield block five, a front middle shield block six, a front middle shield block seven, a front middle shield block eight and eight pairs of symmetrically processed connecting plates, one side of the front middle shield block two is connected to the front middle shield block one through connecting plate bolts and nuts, and the other side is connected to the front middle shield block three through connecting plate bolts and nuts; the rest are analogous: the two sides of the front middle shield block four are respectively connected to the front middle shield block three and the front middle shield block five, the two sides of the front middle shield block six are respectively connected to the front middle shield block five and the front middle shield block seven, and the two sides of the front middle shield block eight are respectively connected to the front middle shield block seven and the front middle shield block one.

[0005] The front middle shield block 2 includes shell 1, shell 2, partition 1, partition 2, partition 3, center ring 1 and center ring 2. The side of the shell 2 is provided with two symmetrical 35° grooves, which are connected to the connecting plate by welding, and a 40° symmetrical groove is processed at the front end of the shell and welded to the shell 1; one side of the shell is provided with two symmetrical 35° grooves, which are connected to the connecting plate by welding, and a 45° single-sided groove is processed at the front end of the shell and connected to the cutter disc; the structures of the front middle shield block 1, the front middle shield block 3, the front middle shield block 4, the front middle shield block 5, the front middle shield block 6, the front middle shield block 7 and the front middle shield block 8 are the same as the front middle shield block 2.

[0006] The material of the shell 1 and the shell 2 is Q355B.

[0007] The connecting plate is made of Q355B and is welded to the shell through grooves reserved on the shell one and the shell two, wherein the front part of the connecting plate is welded to the shell one, and the rear part is welded to the shell two.

[0008] The two tail ends of the shell are provided with three rectangular openings for welding the advanced grouting blocks.

[0009] The present invention also provides an auxiliary welding tooling for the shield shell of an ultra-large diameter shield machine, including an auxiliary welding block, which is U-shaped, with symmetrical 35° grooves processed on both sides, and is welded on the outer arc surfaces of shell one and shell two respectively; 6 auxiliary welding blocks are evenly distributed on each front middle shield block shell.

[0010] The auxiliary welding block material is Q355B.

[0011] The present invention also provides a method for welding a shield shell of an ultra-large diameter shield machine, using an auxiliary welding block, and specifically comprising the following steps:

[0012] 1) Cut / process shell 1, shell 2, connecting plate, partition 1, partition 2 and partition 3 according to the drawing;

[0013] 2) Before welding: Distribute 6 welding points evenly on Shell 1 and Shell 2 according to the size of the U-shaped legs of the auxiliary welding block, determine the corresponding welding positions, and facilitate the determination of the concentric positions of Shell 1 and Shell 2;

[0014] 3) First, evenly weld one side of the U-shaped leg of the auxiliary welding block to the shell 1. Then, weld the other side to the shell 2 accordingly, ensuring that the shells 1 and 2 are in concentric circle positions during the welding process;

[0015] 4) After the welding points of the auxiliary welding block are welded correspondingly, the shell 1 and the shell 2 are welded together according to their groove forms;

[0016] 5) Welding the partition plate 1 and the partition plate 2 to the shell 1 and the two connecting plates in sequence through the reserved grooves;

[0017] 6) The partition plate 3 is welded to the shell 2 and the two connecting plates;

[0018] 7) Center ring 1 and center ring 2 are first welded together according to the pre-processed grooves, and then welded to the two connecting plates and partition 1 and partition 2 in sequence;

[0019] 8) Use the connecting plate to sequentially connect the front middle shield block 1, the front middle shield block 2, the front middle shield block 3, the front middle shield block 4, the front middle shield block 5, the front middle shield block 6, the front middle shield block 7, and the front middle shield block 8;

[0020] 9) Weld the advance grouting block into the pre-processed square opening of the second shell.

[0021] Beneficial effects: The present invention divides the front middle shield body of the super-large diameter shield machine into 8 parts, each of which is cut separately, welded by auxiliary welders, processed and assembled, and then connected with other blocks through connecting plates, ensuring the concentricity of the arc; the auxiliary welding tooling is small in size, convenient to install and dismantle, and has good practicality. In addition, the auxiliary welding tooling is made of Q355B material, which has good mechanical properties and welding properties, and meets the welding and assembly processing of super-large diameter shells. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a schematic structural diagram of the front middle shield of the present invention;

[0023] Figure 2 The figure shows the structure schematic diagram of the front middle shield block 2 of the present invention;

[0024] Figure 3 The figure shows a schematic structural diagram of the housing 1 of the present invention;

[0025] Figure 4 Shown is an enlarged schematic diagram of a groove of a housing of the present invention;

[0026] Figure 5 The figure shows a schematic diagram of the structure of the second housing of the present invention;

[0027] Figure 6 The figure shows the structure schematic diagram of the auxiliary welding block of the present invention;

[0028] Figure 7 Shown is an enlarged schematic diagram of the groove of the auxiliary welding block of the present invention;

[0029] Figure 8 Shown is a schematic diagram of the connecting plate structure of the present invention.

[0030] In the figure: 1. front middle shield block one; 2. front middle shield block two; 3. front middle shield block three; 4. front middle shield block four; 5. front middle shield block five; 6. front middle shield block six; 7. front middle shield block seven; 8. front middle shield block eight; 201. shell one; 202. shell two; 203. auxiliary welding block; 204. connecting plate; 205. partition one; 206. partition two; 207. center ring one; 208. center ring two; 209. partition three; 210. advance grouting block. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0032] like Figure 1-Figure 8 As shown, the present invention provides a shield shell of a super-large diameter shield machine and its auxiliary welding tooling and method. The present invention divides the front middle shield of the super-large diameter shield machine into 8 parts, each of which is cut, welded, processed and assembled separately, and then connected with other blocks through a connecting plate.

[0033] The shield body shell of the super-large diameter shield machine of the present invention comprises a front middle shield block 1, a front middle shield block 2, a front middle shield block 3, a front middle shield block 4, a front middle shield block 5, a front middle shield block 6, a front middle shield block 7, a front middle shield block 8 and eight pairs of symmetrically processed connecting plates 204, one side of the front middle shield block 2 is connected to another connecting plate symmetrically processed on the front middle shield block 1 through the connecting plate 204 by bolts and nuts, and the other side is connected to another connecting plate symmetrically processed on the front middle shield block 3 3 through the connecting plate 204 by bolts and nuts; the rest are analogous: the two sides of the front middle shield block 4 4 are respectively connected to the front middle shield block 3 3 and the front middle shield block 5 5, the two sides of the front middle shield block 6 6 are respectively connected to the front middle shield block 5 5 and the front middle shield block 7 7, and the two sides of the front middle shield block 8 8 are respectively connected to the front middle shield block 7 7 and the front middle shield block 1 1.

[0034] The front middle shield block 2 2 includes a shell 1 201, a shell 202, a partition 1 205, a partition 2 206, a partition 3 209, a center ring 1 207 and a center ring 2 208. The shell 2 202 is provided with two symmetrical 35° grooves, which are connected to the connecting plate 204 by welding, and a 40° symmetrical groove is processed at the front end of the shell and welded to the shell 1 201; the shell 1 201 is provided with two symmetrical 35° grooves on the side, which are connected to the connecting plate 204 by welding, and a 45° single-sided groove is processed at the front end of the shell and connected to the cutter disc; the structures of the front middle shield block 1 1, the front middle shield block 3 3, the front middle shield block 4 4, the front middle shield block 5 5, the front middle shield block 6 6, the front middle shield block 7 7 and the front middle shield block 8 8 are the same as those of the front middle shield block 2 2.

[0035] The shell 1 201 and the shell 2 202 are made of Q355B, which meets the strength and rigidity required by the shield body and has good welding performance; the radius dimension of the shell 1 201 is R7475mm, the thickness is 90mm, the length dimension is 3400mm, and the arc angle is 51.43°; the diameter dimension of the shell 2 202 is R7465mm, the thickness is 80mm, the length dimension is 4480mm, and the arc angle is 51.43°.

[0036] The connecting plate 204 is made of Q355B and is welded to the shell through grooves reserved on the shell 1 201 and the shell 2 202, wherein the front part of the connecting plate 204 is welded to the shell 1 201, and the rear part is welded to the shell 2 202, thereby realizing auxiliary welding of the front middle shield block 2 2.

[0037] The rear end of the second shell 202 is provided with three rectangular openings for welding the advanced grouting block 210 .

[0038] The present invention also provides an auxiliary welding tool for the shield shell of an ultra-large diameter shield machine, including an auxiliary welding block 203, which is U-shaped, with symmetrical 35° grooves processed on both sides, and is welded on the outer arc surfaces of shell 1 201 and shell 2 202 respectively; 6 auxiliary welding blocks 203 are evenly distributed on the shell of the front middle shield block 2 2, and the same is true for the other front middle shield blocks.

[0039] The auxiliary welding block 203 is made of Q355B and has good welding performance.

[0040] The present invention also provides a method for welding a shield shell of an ultra-large diameter shield machine, using an auxiliary welding block 203, and specifically comprising the following steps:

[0041] 1) Cut / process the shell 1 201, shell 2 202, connecting plate 204, partition 1 205, partition 2 206 and partition 3 209 according to the drawing;

[0042] 2) Before welding: 6 welding points are evenly distributed on the shell 1 201 and the shell 2 202 according to the size of the U-shaped legs of the auxiliary welding block 203, and the corresponding welding positions are determined to facilitate the determination of the concentric positions of the shell 1 201 and the shell 2 202;

[0043] 3) First, evenly weld one side of the U-shaped leg of the auxiliary welding block 203 to the housing 1 201; then, weld the other side to the housing 2 202 accordingly, ensuring that the housing 1 201 and the housing 2 202 are in concentric circle positions during the welding process;

[0044] 4) After the welding points of the auxiliary welding block 203 are correspondingly welded, the shell 1 201 and the shell 2 202 are welded together according to their groove forms;

[0045] 5) Welding the partition plate 1 205 and the partition plate 2 206 to the shell 1 201 and the two connecting plates 204 in sequence through the reserved grooves;

[0046] 6) The partition plate 3 209 is welded to the shell 2 202 and the two connecting plates 204;

[0047] 7) The center ring 1 207 and the center ring 2 208 are first welded together according to the pre-processed grooves, and then welded to the two connecting plates 204 and the partition 1 205 and the partition 2 206 in sequence;

[0048] 8) Use the connecting plate 204 to sequentially connect the front middle shield block 1, the front middle shield block 2, the front middle shield block 3, the front middle shield block 4, the front middle shield block 5, the front middle shield block 6, the front middle shield block 7, and the front middle shield block 8;

[0049] 9) Weld the advanced grouting block 210 into the pre-machined square opening of the shell 2 202.

[0050] The shell 1 201 and the shell 2 202 have relatively large diameter and length dimensions. It is difficult to ensure the concentricity of the arc and the mechanical properties after welding during the direct assembly and welding of the two shells. Therefore, several auxiliary welding blocks 203 are added during the welding process. The auxiliary block shells are welded to ensure their concentric position, the mechanical properties of the welding and the processing of welding stress.

[0051] The present invention divides the front middle shield body of the super-large diameter shield machine into 8 parts, each of which is cut separately, welded by auxiliary welders, processed and assembled, and then connected with other blocks through connecting plates, thereby ensuring the concentricity of the arc; the auxiliary welding tooling has a small size of a single piece, is convenient to install and dismantle, and has good practicality; and the auxiliary welding tooling uses Q355B material, has good mechanical properties and welding properties, and meets the welding and assembly processing requirements of super-large diameter shells.

[0052] The above embodiments of the present invention are merely illustrative and not exclusive, and all modifications within the scope of the present invention or equivalent to the scope of the present invention are encompassed by the present invention.

Claims

1. A shield shell of an ultra-large diameter shield machine, characterized in that: It comprises a front middle shield block 1 (1), a front middle shield block 2 (2), a front middle shield block 3 (3), a front middle shield block 4 (4), a front middle shield block 5 (5), a front middle shield block 6 (6), a front middle shield block 7 (7), a front middle shield block 8 (8) and eight pairs of symmetrically processed connecting plates (204), wherein one side of the front middle shield block 2 (2) is connected to the front middle shield block 1 (1) via a connecting plate (204) and bolts and nuts, and the other side is connected to the front middle shield block 3 (3) via a connecting plate (204) and bolts and nuts; the rest are similarly deduced: the two sides of the front middle shield block 4 (4) are respectively connected to the front middle shield block 3 (3) and the front middle shield block 5 (5), the two sides of the front middle shield block 6 (6) are respectively connected to the front middle shield block 5 (5) and the front middle shield block 7 (7), and the two sides of the front middle shield block 8 (8) are respectively connected to the front middle shield block 7 (7) and the front middle shield block 1 (1); The front middle shield block 2 (2) comprises a shell 1 (201), a shell 2 (202), a partition 1 (205), a partition 2 (206), a partition 3 (209), a center ring 1 (207) and a center ring 2 (208). The shell 2 (202) is provided with two symmetrical 35° grooves on the side, which are connected to the connecting plate (204) by welding. The front end of the shell 2 (202) is processed with a 40° symmetrical groove which is welded to the shell 1 (201). The shell 1 (201) is provided with two symmetrical 35° grooves on its side, which are connected to the connecting plate (204) by welding, and the front end of the shell 1 (201) is processed with a 45° single-sided groove connected to the cutter disc; the structures of the front middle shield block 1 (1), the front middle shield block 3 (3), the front middle shield block 4 (4), the front middle shield block 5 (5), the front middle shield block 6 (6), the front middle shield block 7 (7) and the front middle shield block 8 (8) are the same as the front middle shield block 2 (2); Auxiliary welding blocks (203) are welded on the outer arc surfaces of the shell 1 (201) and the shell 2 (202); the auxiliary welding blocks (203) are U-shaped, and symmetrical 35° grooves are processed on both sides; six auxiliary welding blocks (203) are evenly distributed on each front middle shield shell; The welding method of the shield shell of the super-large diameter shield machine comprises the following steps: 1) Cut / process shell 1 (201), shell 2 (202), connecting plate (204), partition 1 (205), partition 2 (206) and partition 3 (209) according to the drawing; 2) Before welding: 6 welding points are evenly distributed on the shell 1 (201) and the shell 2 (202) according to the size of the U-shaped leg of the auxiliary welding block (203), and the corresponding welding positions are determined to facilitate the determination of the concentric positions of the shell 1 (201) and the shell 2 (202); 3) First, one side of the U-shaped leg of the auxiliary welding block (203) is uniformly welded to the first shell (201); then the other side is correspondingly welded to the second shell (202), ensuring that the first shell (201) and the second shell (202) are in a concentric position during the welding process; 4) After the welding points of the auxiliary welding block (203) are welded correspondingly, the shell 1 (201) and the shell 2 (202) are welded together according to their groove forms; 5) The partition plate 1 (205) and the partition plate 2 (206) are welded to the shell 1 (201) and the two connecting plates (204) in sequence through the reserved grooves; 6) The partition plate 3 (209) is welded to the shell 2 (202) and the two connecting plates (204) in sequence; 7) The center ring 1 (207) and the center ring 2 (208) are first welded together according to the pre-processed grooves, and then welded to the two connecting plates (204) and the partition 1 (205) and the partition 2 (206) in sequence; 8) Using the connecting plate (204), sequentially connect the front middle shield block 1 (1), the front middle shield block 2 (2), the front middle shield block 3 (3), the front middle shield block 4 (4), the front middle shield block 5 (5), the front middle shield block 6 (6), the front middle shield block 7 (7), and the front middle shield block 8 (8); 9) The advanced grouting blocks (210) are sequentially welded in the pre-processed square openings of the second shell (202).

2. The shield shell of the super-large diameter shield machine according to claim 1 is characterized in that: The material of the shell 1 (201) and the shell 2 (202) is Q355B.

3. The shield shell of the super-large diameter shield machine according to claim 1, characterized in that: The connecting plate (204) is made of Q355B and is welded to the shell through grooves reserved on the first shell (201) and the second shell (202), wherein the front portion of the connecting plate (204) is welded to the first shell (201) and the rear portion is welded to the second shell (202).

4. The shield shell of the super-large diameter shield machine according to claim 1, characterized in that: The rear end of the second shell (202) is provided with three rectangular openings for welding the advanced grouting block (210).

5. The shield shell of the super-large diameter shield machine according to any one of claims 1 to 4, characterized in that: The auxiliary welding block (203) is made of Q355B.

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