TBM tunnel section steel arch frame connecting method

Abstract

The invention discloses a TBM tunnel section steel arch frame connecting method. An existing steel arch frame is formed by welding a steel plate and the end of the arch frame and then connecting the steel plate and the end of the arch frame through bolts, and therefore the structural steel arch frame is insufficient in rockburst impact resistance. The profile steel arches a are connected through the arc-shaped channel steel a and are reinforced through welding, so that the profile steel arches a are more effectively connected together; the section steel arch frame b adopts an opening design, the assembled section steel arch frame is tightly supported on the rock surface by utilizing an equipment arch frame installer combined with an oil cylinder, and then the opening position of the arch frame is fastened and locked by adopting a bolt. According to the invention, the integrity and the stability of the profile steel arch frame a are enhanced, and the strength, the rigidity and the impact resistance of the whole structure are improved; the profile steel arch frame can be quickly closed into a ring and tightly attached to surrounding rock, the construction efficiency is improved, time and labor are saved, and construction safety is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a TBM tunnel steel arch connection method. Background Art

[0002] As my country's deep-buried and long tunnel projects adopt TBM construction methods more and more frequently, the rock burst disaster problem faced by deep-buried tunnels has become more and more prominent. Frequent rock burst disasters pose a serious threat to the personal safety of construction workers and the safety of construction machinery and equipment such as TBMs. At the same time, the occurrence of rock bursts increases the support measures and costs. When the rock burst level is high, there will be large-scale block and plate spalling, ejection and flying. In severe cases, tons of rock will be ejected from the arch, causing large-scale landslides induced by rock bursts. There is no obvious sign before the rock burst occurs. Its occurrence is sudden, uncertain and random. As a global problem, the prediction and control of rock bursts are still being explored and improved.

[0003] The circular steel arch support for TBM-constructed tunnels is a commonly used technology in my country's tunnel construction process. In order to better reinforce the tunnel's primary support system during construction, especially for surrounding rocks with poor geology, it is necessary to support the top and surrounding areas of the tunnel. The steel arch has good bearing capacity and can play a better supporting role during construction. The steel arch is the main support body of the tunnel project. However, due to the closed design of the existing steel arch, each piece of the steel arch is welded with a steel plate and the end of the steel arch, and then bolted together to form a whole, resulting in the steel arch's lack of rock burst resistance and flexible support performance. Summary of the invention

[0004] In order to make up for the shortcomings of the prior art, the present invention provides a TBM tunnel steel arch connection method to improve the strength, rigidity and impact resistance of the overall structure of the steel arch, effectively reduce the risk of distortion and deformation of the steel arch, reduce the probability of geological disasters, and ensure the safety of tunnel construction personnel and equipment.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A TBM tunnel steel arch connection method comprises the following steps:

[0007] Step 1: Transport the qualified steel arch frame to the assembly hole by trackless transport and then transport it to the construction site by flatbed transport vehicle;

[0008] Step 2: Before assembly, first remove the slag and debris at the invert, and then use the arch frame installer to assemble from bottom to top; align the two sections of steel arch frame a, align the position of the web opening of the channel steel a with the steel arch frame a, and use bolts to connect the two adjacent steel arch frames a and channel steel a; turn the arch frame installer to assemble the next section of the arch frame, and cycle in sequence. After the upper arch frame is assembled, recheck and tighten the bolts at all the steel arch frame connections, and weld and reinforce the flange positions of the channel steel a and the steel arch frame a, and the interface of the steel arch frame a;

[0009] Step 3: Turn the steel arch frame installer to turn the arch foot to the bottom, support the steel arch frame at the measured position, set two channel steels b on both sides of the web of the steel arch frame b, pass the bolts through the waist-shaped holes in the middle of the channel steel b and tighten them, so as to clamp both sides of the web of the steel arch frame b and realize the connection of the two channel steels b;

[0010] Step 4: Adjust the inclination of the steel arch frame according to the measured position of the steel arch frame to ensure that the steel arch frame is in the same vertical plane, rotate the arch frame installer to turn the arch foot to the bottom, and then operate the oil cylinder to tighten the steel arch frame b and the surrounding rock, adjust the lap length between the two ends of the channel steel b and the steel arch frame b, and pass the bolts through the waist-shaped holes on both sides of the channel steel b and the steel arch frame b to achieve the connection between the channel steel b and the steel arch frame b, so that the positions of the two sides b and the web of the steel arch frame b are locked, and finally welding is used to reinforce the positions of the end plates of the channel steel b and the steel arch frame b and the interface of the steel arch frame;

[0011] Step 5: Finally, use φ22 steel bars to weld it firmly to the previous steel frame longitudinally to form an overall load-bearing structure.

[0012] Furthermore, the device used in the method includes a plurality of steel arch frames a, and two steel arch frames b are arranged between the first and last two steel arch frames a;

[0013] Two adjacent steel arch frames a are connected by channel steel a and bolts; two adjacent steel arch frames b are connected by channel steel b and bolts.

[0014] Furthermore, the channel steel a is arc-shaped.

[0015] Furthermore, channel steel a is respectively arranged on both sides of the web of the steel arch frame a, and the channel steel a is arranged between the end plates of the steel arch frame a. The web of the channel steel a coincides with the web of the steel arch frame a, and the end plates of the channel steel a coincide with the end plates of the steel arch frame a.

[0016] Further, the channel steel a is provided with three channel steel circular holes, and the two ends of the section steel arch frame a are respectively provided with U-shaped holes and waist-shaped holes, and the U-shaped holes on two adjacent section steel arch frames a form a waist-shaped hole;

[0017] The U-shaped hole and waist-shaped hole on the steel arch frame a correspond to the positions of the three channel steel circular holes on the channel steel a.

[0018] Furthermore, welding is used to reinforce the web and end plates of the channel steel a and the steel arch frame a.

[0019] Furthermore, the channel steel b is arc-shaped.

[0020] Furthermore, channel steels b are respectively arranged on both sides of the web of the steel arch frame b; the channel steel b is arranged between the end plates of the steel arch frame b, the web of the channel steel b coincides with the web of the steel arch frame b, and the end plates of the channel steel b coincide with the end plates of the steel arch frame b.

[0021] Furthermore, three waist-shaped holes are arranged on the web of the channel steel b; bolts are arranged in the waist-shaped holes in the middle of the channel steel b to realize the connection between the two channel steels b; and the two ends of the channel steel b are respectively connected to the steel arch frame b by bolts.

[0022] Furthermore, welding is used to reinforce the web and end plates of the channel steel b and the steel arch frame b.

[0023] Beneficial effects of the present invention:

[0024] 1) The steel arch frames a of the present invention are connected by arc-shaped channel steel a and reinforced by welding, which makes the steel arch frames a more effectively connected, enhances the integrity and stability of the steel arch frames a, and improves the strength, rigidity and impact resistance of the overall structure;

[0025] 2) The steel arch frame b of the present invention adopts an open design. The equipment arch frame installer is used in combination with the oil cylinder to support the assembled steel arch frame against the rock surface, and then the arch frame opening position is fastened and locked with bolts. The steel arch frame can be quickly closed into a ring and fit closely to the surrounding rock, thereby improving construction efficiency, saving time and effort, and enabling the initial support to quickly exert its rigidity effect, thereby limiting the deformation of the surrounding rock mass to a certain extent, enhancing the self-stabilizing ability of the surrounding rock, and ensuring construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a detailed diagram of the connection of the steel arch frame a of the present invention;

[0028] Figure 3 This is a cross-sectional view of the steel arch frame a of the present invention;

[0029] Figure 4 This is a cross-sectional view of the channel steel a of the present invention;

[0030] Figure 5 This is a cross-sectional view of the connection of the channel steel a of the present invention;

[0031] Figure 6This is a detailed diagram of the connection of the steel arch frame b of the present invention;

[0032] In the figure, 1-steel arch frame a, 2-channel steel a, 3-waist-shaped hole, 4-U-shaped hole, 5-channel steel round hole, 6-φ22 steel bar, 7-steel arch frame b, 8-channel steel b, 9-bolt. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with specific implementation modes.

[0034] The present invention improves the strength, rigidity and impact resistance of the overall structure of the steel arch frame; and adopts an open design to hold the assembled steel arch frame tightly against the rock surface, so that the steel arch frame can be quickly closed into a ring, tightly fitting the surrounding rock, improving construction efficiency, saving time and effort, and allowing the initial support to quickly play a rigidity role, to a certain extent limit the deformation of the surrounding rock mass, enhance the self-stabilizing ability of the surrounding rock, and ensure construction safety. Specifically, it includes the following steps:

[0035] Step 1: Transport the qualified steel arch frame to the assembly hole by trackless transport and then transport it to the construction site by flatbed transport vehicle;

[0036] Step 2: Before assembling, first remove the slag and debris at the inverted arch, and then use the arch frame installer to assemble from bottom to top; align the two sections of steel arch frames a1, align the channel steel a2 with the web plate hole position of the steel arch frame a1, and use bolts 9 to connect the two adjacent steel arch frames a1 and channel steel a2; rotate the arch frame installer to assemble the next section of the arch frame, and cycle in sequence. After the upper arch frame is assembled, recheck and tighten the bolts at all the steel arch frame connections, and weld and reinforce the flange position of the channel steel a2 and the steel arch frame a1 and the interface of the steel arch frame a1;

[0037] Step 3: Rotate the steel arch frame installer to turn the arch foot to the bottom, support the steel arch frame at the measured position, set two channel steels b8 on both sides of the web of the steel arch frame b7, and tighten the bolts 9 through the waist-shaped holes 3 in the middle of the channel steel b8, so as to clamp both sides of the web of the steel arch frame b7 and realize the connection of the two channel steels b8;

[0038] Step 4: Adjust the inclination of the steel arch frame according to the measured position of the steel arch frame to ensure that the steel arch frame is in the same vertical plane, rotate the arch frame installer to turn the arch foot to the bottom, and then operate the oil cylinder to tighten the steel arch frame b7 and the surrounding rock, adjust the lap length between the two ends of the channel steel b8 and the steel arch frame b7, and pass the bolts 9 through the waist-shaped holes 3 on both sides of the channel steel b8 and the steel arch frame b7 to achieve the connection between the channel steel b8 and the steel arch frame b7, so that the positions of the webs of the two sides of b8 and the steel arch frame b7 are locked, and finally welding is used to reinforce the positions of the end plates of the channel steel b8 and the steel arch frame b7 and the steel arch frame interface;

[0039] Step 5: Finally, φ22 steel bars 6 are used to weld firmly to the previous steel frame longitudinally to form an overall force-bearing structure.

[0040] like Figure 1 As shown, the specific structure of the device used in the method of the present invention is:

[0041] It comprises a plurality of steel arch frames a1, and two steel arch frames b7 are arranged between the first and last two steel arch frames a1;

[0042] Two adjacent steel arch frames a1 are connected by channel steel a2 and bolts 9; two adjacent steel arch frames b7 are connected by channel steel b8 and bolts 9.

[0043] like Figure 2 , 3 As shown in , 4 and 5, the channel steel a2 is in an arc shape; channel steels a2 are respectively arranged on both sides of the web of the steel arch frame a1, and the channel steel a2 is arranged between the end plates of the steel arch frame a1. The web of the channel steel a2 coincides with the web of the steel arch frame a1, and the end plates of the channel steel a2 coincide with the end plates of the steel arch frame a1.

[0044] Three channel steel circular holes 5 are arranged on the channel steel a2, and U-shaped holes 4 and waist-shaped holes 3 are arranged at both ends of the steel arch frame a1, respectively. The U-shaped holes 4 on two adjacent steel arch frames a1 form a waist-shaped hole; the U-shaped holes 4 and waist-shaped holes 3 on the steel arch frame a1 correspond to the positions of the three channel steel circular holes 5 on the channel steel a2. The webs and end plates of the channel steel a2 and the steel arch frame a1 are reinforced by welding.

[0045] like Figure 6 As shown, the channel steel b8 is arc-shaped; channel steels b8 are respectively arranged on both sides of the web of the steel arch frame b7; the channel steel b8 is arranged between the end plates of the steel arch frame b7, the web of the channel steel b8 coincides with the web of the steel arch frame b7, and the end plate of the channel steel b8 coincides with the end plate of the steel arch frame b7.

[0046] Three waist-shaped holes 3 are arranged on the web of channel steel b8; the length of the waist-shaped hole in the middle is shorter than the length of the waist-shaped holes on both sides; bolts 9 are arranged in the waist-shaped hole 3 in the middle of channel steel b8 to connect the two channel steels b8; the two ends of channel steel b8 are connected to the steel arch frame b7 by bolts 9 respectively. Bolts 9 pass through the webs of channel steel b8 and steel arch frame b7, and bolt holes are arranged on the webs of steel arch frame b7. The webs and end plates of channel steel b8 and steel arch frame b7 are reinforced by welding.

[0047] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", and "fix" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The content of the present invention is not limited to the embodiments listed, and any equivalent changes made to the technical solution of the present invention by ordinary technicians in this field after reading the description of the present invention are covered by the claims of the present invention.

Claims

1. A TBM tunnel steel arch connection method, characterized in that: The steps include: Step 1: Transport the qualified steel arch frame to the assembly hole by trackless transport and then transport it to the construction site by flatbed transport vehicle; Step 2: Before assembling, first remove the slag and debris at the inverted arch, and then use the arch frame installer to start assembling from bottom to top; align the two sections of steel arch frames a (1), align the channel steel a (2) with the web hole position of the steel arch frame a (1), and use bolts (9) to connect the two adjacent steel arch frames a (1) and channel steel a (2); rotate the arch frame installer to assemble the next section of the arch frame, and repeat the cycle in sequence. After the upper arch frame is assembled, recheck and tighten the bolts at all the steel arch frame connections, and weld and reinforce the flange position of the channel steel a (2) and the steel arch frame a (1) and the interface of the steel arch frame a (1); Step 3: Rotate the steel arch frame installer to turn the arch foot to the bottom, support the steel arch frame at the measured position, respectively set the two channel steels b (8) on both sides of the web of the steel arch frame b (7), pass the bolts (9) through the waist-shaped holes (3) in the middle of the channel steel b (8) and tighten them, thereby clamping the two sides of the web of the steel arch frame b (7) to achieve the connection of the two channel steels b (8); Step 4: Adjust the inclination of the steel arch frame according to the measured position of the steel arch frame to ensure that the steel arch frame is in the same vertical plane, rotate the arch frame installer to turn the arch foot to the bottom, and then operate the oil cylinder to tighten the steel arch frame b (7) and the surrounding rock, adjust the overlap length between the two ends of the channel steel b (8) and the steel arch frame b (7), pass the bolts (9) through the waist-shaped holes (3) on both sides of the channel steel b (8) and the steel arch frame b (7), and realize the connection between the channel steel b (8) and the steel arch frame b (7), so that the positions of the two sides b (8) and the web of the steel arch frame b (7) are locked, and finally welding is used to reinforce the positions of the end plates of the channel steel b (8) and the steel arch frame b (7) and the steel arch frame interface; Step 5: Finally, φ22 steel bars (6) are used to weld the steel frame to the upper frame to form an integral force-bearing structure.

2. A TBM tunnel steel arch connection method according to claim 1, characterized in that: The device used in the method comprises a plurality of steel arch frames a (1), and two steel arch frames b (7) are arranged between the first and last two steel arch frames a (1); Two adjacent steel arch frames a (1) are connected via channel steel a (2) and bolts (9); and two adjacent steel arch frames b (7) are connected via channel steel b (8) and bolts (9).

3. A TBM tunnel steel arch connection method according to claim 2, characterized in that: The channel steel a(2) is in an arc shape.

4. A TBM tunnel steel arch connection method according to claim 3, characterized in that: Channel steel a(2) is respectively arranged on both sides of the web of the steel arch a(1); the channel steel a(2) is arranged between the end plates of the steel arch a(1); the web of the channel steel a(2) overlaps with the web of the steel arch a(1); and the end plates of the channel steel a(2) overlap with the end plates of the steel arch a(1).

5. A TBM tunnel steel arch connection method according to claim 4, characterized in that: The channel steel a (2) is provided with three channel steel circular holes (5), and the two ends of the section steel arch frame a (1) are respectively provided with U-shaped holes (4) and waist-shaped holes (3), and the U-shaped holes (4) on two adjacent section steel arch frames a (1) form a waist-shaped hole; The positions of the U-shaped hole (4) and the waist-shaped hole (3) on the steel arch frame a (1) correspond to the positions of the three channel steel circular holes (5) on the channel steel a (2).

6. A TBM tunnel steel arch connection method according to claim 5, characterized in that: The channel steel a (2) and the web and end plates of the steel arch frame a (1) are reinforced by welding.

7. A TBM tunnel steel arch connection method according to claim 6, characterized in that: The channel steel b (8) is in an arc shape.

8. A TBM tunnel steel arch connection method according to claim 7, characterized in that: Channel steels b(8) are respectively arranged on both sides of the web of the steel arch frame b(7); the channel steels b(8) are arranged between the end plates of the steel arch frame b(7); the web of the channel steels b(8) overlaps with the web of the steel arch frame b(7); and the end plates of the channel steels b(8) overlap with the end plates of the steel arch frame b(7).

9. A TBM tunnel steel arch connection method according to claim 8, characterized in that: The web of the channel steel b (8) is provided with three waist-shaped holes (3); a bolt (9) is provided in the waist-shaped hole (3) in the middle of the channel steel b (8) to realize the connection between the two channel steels b (8); and the two ends of the channel steel b (8) are respectively connected to the steel arch frame b (7) through the bolts (9).

10. A TBM tunnel steel arch connection method according to claim 9, characterized in that: The channel steel b (8) and the web and end plates of the steel arch frame b (7) are reinforced by welding.

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