A temporary support structure for tunnel mid-partition method construction

Abstract

A kind of temporary support structure of tunnel mid septum method construction, including first, second side wall support section, first, second excavation face support section, connecting section, several anchor rods, first side wall support section is arc segment, and with tunnel side wall upper profile is adapted, second side wall support section is arc segment, and with tunnel side wall lower profile is adapted, first excavation face support section is arc segment, second excavation face support section is arc segment, first side wall support section, second side wall support section, first excavation face support section, second excavation face support section, connecting section are connected in head, form detachable fixed connection, several sleeves are threaded on first, second excavation face support section, and sleeve mouth is towards excavation face, one end of several anchor rods is inserted into tunnel excavation face, the other end is inserted into corresponding sleeve, and is locked by locking bolt.This utility model is based on meeting CD method tunnel construction temporary support, it is convenient to install, dismantle, meet on-site construction demand.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction, and in particular to a temporary support structure for tunnel diaphragm construction. Background Technology

[0002] The Central Divider Wall (CD) method is a staged excavation technique suitable for large-span tunnels in weak surrounding rock. It ensures construction safety by installing temporary support structures in the middle of the tunnel. Its main functions are: to separate the excavation faces, reduce the excavation span, thereby controlling surface settlement and surrounding rock deformation; and to provide a safe working environment for construction workers, ensuring safe construction. As tunnel excavation progresses, the temporary support structures need to be gradually removed to allow for subsequent tunnel lining construction.

[0003] However, the temporary support structure currently in use is constructed by welding multiple support sections, which results in long on-site support time, cannot provide early support strength quickly, and is difficult to dismantle, and is also prone to welding defects.

[0004] Therefore, designing a temporary support structure that can be quickly installed and disassembled to provide early support strength as soon as possible is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a temporary support structure for tunnel construction using the partition wall method. This structure not only meets the requirements for temporary support in CD method tunnel construction but also facilitates installation and disassembly, thus satisfying on-site construction needs.

[0006] The technical solution of this utility model is: a temporary support structure for tunnel diaphragm wall construction, comprising a first sidewall support section, a second sidewall support section, a first excavation face support section, a second excavation face support section, a connecting section, and several anchor bolts. The cross-section of each support section and connecting section is I-shaped. The first sidewall support section is an arc segment, conforming to the upper contour of the tunnel sidewall, and has a first connecting flange at its bottom, located on a horizontal plane. The second sidewall support section is an arc segment, conforming to the lower contour of the tunnel sidewall, and has a second connecting flange at its top, also located on a horizontal plane. The first excavation face support section is an arc segment, with an angle steel at the top of its web and a third connecting flange at its bottom. The flange is located on a horizontal plane. The second excavation face support section is an arc segment with an angle steel at the bottom of its web and a fourth connecting flange at its top. The fourth connecting flange is located on a horizontal plane. An angle steel is provided at one end of the web of the connecting section. The first side wall support section, the second side wall support section, the first excavation face support section, the second excavation face support section, and the connecting section are connected end to end. They are connected by bolts through the flanges, the angle steel, and the connecting flanges, and are connected with nuts to form a detachable fixed connection. Several sleeves are threadedly fitted on the first excavation face support section and the second excavation face support section, with the sleeve opening facing the excavation face. One end of several anchor rods is inserted into the tunnel excavation face, and the other end is inserted into the corresponding sleeve and locked by locking bolts. The combination forms a temporary support structure.

[0007] The anchor rod is made of threaded steel bar.

[0008] The first excavation face support section and the second excavation face support section protrude towards the excavation face.

[0009] Angle steel is welded to both sides of the top of the web of the first excavation face support section, angle steel is welded to both sides of the bottom of the web of the second excavation face support section, and angle steel is welded to both sides of one end of the web of the connecting section.

[0010] Multiple pairs of threaded holes are provided at intervals along the length direction on the two flanges of the first excavation face support section and the second excavation face support section. The sleeve is threaded into the threaded holes and located between the two flanges of the support section.

[0011] Adjacent threaded holes are located on both sides of the web.

[0012] The above technical solution has the following beneficial effects:

[0013] 1. The temporary support structure for tunnel construction using the diaphragm wall method includes a first sidewall support section, a second sidewall support section, a first excavation face support section, a second excavation face support section, a connecting section, and several anchor bolts. The cross-section of each support section and connecting section is I-shaped to ensure structural strength. The first sidewall support section is an arc-shaped segment that conforms to the upper contour of the tunnel sidewall. A first connecting flange is installed at its bottom, and the first connecting flange is located on a horizontal plane. The first sidewall support section supports the upper part of the tunnel excavation section's sidewall. The second sidewall support section is an arc-shaped segment that conforms to the lower contour of the tunnel sidewall. A second connecting flange is installed at its top, and the second connecting flange is located on a horizontal plane. The second sidewall support section supports the lower part of the tunnel excavation section's sidewall. The first excavation face support section is an arc-shaped segment, with an angle steel at the top of its web and a third connecting flange at its bottom, both located on a horizontal plane. This first excavation face support section supports the upper part of the tunnel excavation face. The second excavation face support section is also an arc-shaped segment, with an angle steel at the bottom of its web and a fourth connecting flange at its top, both located on a horizontal plane. This second excavation face support section supports the lower part of the tunnel excavation face. An angle steel is installed at one end of the web of the connecting section, which connects the second sidewall support section and the second excavation face support section, forming a closed-loop structure to ensure the supporting strength of the temporary support structure. The first sidewall support section, the second sidewall support section, the first excavation face support section, the second excavation face support section, and the connecting section are connected end to end. They are connected by bolts through the flanges, angle steel, and connecting flanges, and then by nuts to form a detachable fixed connection. That is, the first sidewall support section, the second sidewall support section, the first excavation face support section, the second excavation face support section, and the connecting section, which form a closed loop structure, are detachable. This makes the temporary support structure very convenient to install and disassemble, and ensures the connection strength. In addition, since the connecting flanges are all located on the horizontal plane, the support strength of the first sidewall support section and the first excavation face support section can also be guaranteed. Several sleeves are threaded and fitted onto the first and second excavation face support sections, with the sleeve openings facing the excavation face. One end of several anchor rods is inserted into the tunnel excavation face, and the other end is inserted into the corresponding sleeve, and locked by locking bolts. The combination forms a temporary support structure. The multiple anchor rods and the two suspended supports are also detachable, making installation and disassembly very convenient. At the same time, the connection structure has high strength, ensuring the effectiveness of the temporary support.

[0014] 2. Multiple pairs of threaded holes are provided at intervals along the length of the two flanges of the first and second excavation face support sections. The sleeves are threaded into the threaded holes and located between the two flanges of the support section. The installation and disassembly of the sleeves are simple and convenient, and the assembly status of the sleeves can be directly observed. Adjacent pairs of threaded holes are located on both sides of the web, that is, two adjacent sleeves are located on both sides of the web of the corresponding suspended support section, avoiding concentrated force on one side and improving the stability of the temporary support structure.

[0015] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details. Attached Figure Description

[0016] Figure 1 This is a connection diagram of the present invention;

[0017] Figure 2 for Figure 1 Enlarged view at point M;

[0018] Figure 3 for Figure 1 Enlarged view at point N;

[0019] Figure 4 for Figure 1 Enlarged view of the middle Q section.

[0020] In the attached diagram, 1 is the first sidewall support section, 2 is the second sidewall support section, 3 is the first excavation face support section, 4 is the second excavation face support section, 5 is the connecting section, 6 is the anchor bolt, 7 is the first connecting flange, 8 is the second connecting flange, 9 is the third connecting flange, 10 is the fourth connecting flange, 11 is the sleeve, and 12 is the locking bolt. Detailed Implementation

[0021] See Figures 1 to 4This is a specific embodiment of a temporary support structure for tunnel diaphragm wall construction. The temporary support structure for tunnel diaphragm wall construction includes a first sidewall support section 1, a second sidewall support section 2, a first excavation face support section 3, a second excavation face support section 4, a connecting section 5, and several anchor bolts 6. Each support section and connecting section has an I-shaped cross-section, i.e., it uses I-beams, and the anchor bolts are made of threaded steel bars. The first sidewall support section 1 is an arc-shaped segment that conforms to the upper contour of the tunnel sidewall. A first connecting flange 7 is provided at its bottom end, and the first connecting flange 7 is located on a horizontal plane. The second sidewall support section 2 is an arc-shaped segment that conforms to the lower contour of the tunnel sidewall. A second connecting flange 8 is provided at its top end, and the second connecting flange 8 is located on a horizontal plane. The first excavation face support section 3 is an arc-shaped segment. An angle steel is installed at the top of its web, and a third connecting flange 9 is installed at its bottom. The third connecting flange 9 is located on a horizontal plane. Specifically, the first excavation face support section 3 protrudes towards the excavation face, and angle steel is welded to both sides of the top of the web of the first excavation face support section 3 to ensure connection stability and strength. The second excavation face support section 4 is an arc-shaped segment. An angle steel is installed at the bottom of its web, and a fourth connecting flange 10 is installed at its top. The fourth connecting flange 10 is located on a horizontal plane. Specifically, the second excavation face support section 4 protrudes towards the excavation face, and angle steel is welded to both sides of the bottom of the web of the first excavation face support section 3 to ensure connection stability and strength. An angle steel is installed at the left end of the web of the connecting section 5. Specifically, angle steel is welded to both sides of the left end of the web of the connecting section 5. The first sidewall support section 1, the second sidewall support section 2, the first excavation face support section 3, the second excavation face support section 4, and the connecting section 5 are connected end to end, and are connected to the flanges and angle steel and the flange plates by bolts, forming a detachable fixed connection with nuts. Several sleeves 11 are threaded onto the first excavation face support section 3 and the second excavation face support section 4, with the sleeve openings facing the excavation face. In this embodiment, multiple pairs of threaded holes are spaced along the length of the two flange plates of the first excavation face support section 3 and the second excavation face support section 4, with adjacent pairs of threaded holes located on both sides of the web. The sleeves 11 are threaded into the threaded holes and located between the two flange plates of the support section. One end of several anchor bolts 6 is inserted into the tunnel excavation face, and the other end is inserted into the corresponding sleeve 11. Locking bolts are threaded radially onto the sleeves to lock the anchor bolts, forming a temporary support structure. Of course, in actual construction, multiple temporary support structures are spaced along the tunnel excavation direction.

Claims

1. A temporary support structure for tunnel construction using the diaphragm wall method, characterized in that: It includes the first sidewall support section (1), the second sidewall support section (2), the first excavation face support section (3), the second excavation face support section (4), the connecting section (5), and several anchor bolts (6). The cross-sections of each support section and connecting section are all I-shaped. The first sidewall support section (1) is an arc-shaped section that conforms to the upper contour of the tunnel sidewall. A first connecting flange (7) is provided at its bottom end, and the first connecting flange (7) is located on a horizontal plane. The second sidewall support section (2) is an arc-shaped section that conforms to the lower contour of the tunnel sidewall. A second connecting flange (8) is provided at its top end, and the second connecting flange (8) is located on a horizontal plane. The first excavation face support section (3) is an arc-shaped section, with an angle steel at the top of its web and a third connecting flange (9) at its bottom, and the third connecting flange (9) is located on a horizontal plane. The second excavation face support section (4) is an arc-shaped section, with an angle steel at the bottom of its web and a fourth connecting flange (10) at its top, and the fourth connecting flange (10) is located on a horizontal plane. An angle steel is provided at one end of the web of the connecting section (5). The first sidewall support section (1), the second sidewall support section (2), the first excavation face support section (3), the second excavation face support section (4), and the connecting section (5) are connected end to end, and are connected to the flanges by bolts passing through the butt joints, the angle steel and the butt joint flanges, and the nuts to form a detachable fixed connection. Several sleeves (11) are threaded onto the first excavation face support section (3) and the second excavation face support section (4), with the sleeve opening facing the excavation face. One end of several anchor rods (6) is inserted into the tunnel excavation face, and the other end is inserted into the corresponding sleeve (11), and locked by locking bolts (12), forming a temporary support structure.

2. The temporary support structure for tunnel diaphragm wall construction according to claim 1, characterized in that: The anchor rod (6) is made of threaded steel bar.

3. The temporary support structure for tunnel diaphragm wall construction according to claim 1, characterized in that: The first excavation face support section (3) and the second excavation face support section (4) protrude toward the excavation face.

4. The temporary support structure for tunnel diaphragm wall construction according to claim 1, characterized in that: Angle steel is welded to both sides of the top of the web of the first excavation face support section (3), angle steel is welded to both sides of the bottom of the web of the second excavation face support section (4), and angle steel is welded to both sides of one end of the web of the connecting section (5).

5. The temporary support structure for tunnel diaphragm wall construction according to claim 1, characterized in that: Multiple pairs of threaded holes are provided at intervals along the length direction on the two wing plates of the first excavation face support section (3) and the second excavation face support section (4). The sleeve (11) is threaded into the threaded holes and is located between the two wing plates of the support section.

6. The temporary support structure for tunnel diaphragm wall construction according to claim 5, characterized in that: Adjacent threaded holes are located on both sides of the web.

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