Open TBM and Construction Method of Support Structure during Tunneling

Abstract

The present invention discloses an open TBM and a construction method for a support structure during tunneling, relating to the technical field of open TBMs. The open TBM includes: a shield and a main body. The shield is arranged around the main body. A partial space near the rear end inside the shield forms an assembly area, and the assembly area is used to provide space for the assembly of support segments. The construction method includes: Assembly: Assembling the support segments in the assembly area. After the assembly at all the assembly positions in the assembly area is completed; Tunneling: The open TBM tunnels for one stroke; Repeating the assembly step and the tunneling step multiple times. The solution provided by the present invention realizes the overlap between the rear end of the shield and the front end of the support structure, avoids sundries falling from the external surrounding rock from falling into the shield or the support structure between the shield and the support structure, and thus ensures the safety of internal personnel and equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of open TBM, and particularly to an open TBM and a construction method for a support structure during tunneling. Background Art

[0002] The existing open TBM shield is designed short. During tunneling, it can only shield the main components and cannot provide a space for the installation of steel segment linings. During construction, the steel segment linings are assembled into a cylindrical support structure, and the construction process of the support structure is always carried out outside the shield. There is a gap between the shield and the support structure, and there is no overlap, which leads to the situation that during construction (tunneling or other construction processes, such as drilling, support, etc.), the soil, rocks, etc. that fall after the surrounding rock deforms are likely to fall into the shield, easily causing injuries to the personnel inside the shield and damage to the machinery. Summary of the Invention

[0003] The purpose of the present invention is to provide an open TBM and a construction method for a support structure during tunneling to solve the problems existing in the above-mentioned prior art and improve the construction safety.

[0004] To achieve the above purpose, the present invention provides the following solutions:

[0005] The present invention provides an open TBM, including: a shield and a main body. The shield is arranged around the main body, and a part of the space near the rear end inside the shield forms an assembly area, and the assembly area is used to provide a space for the assembly of support segment linings.

[0006] The present invention provides a construction method for a support structure during tunneling of an open TBM. Using the open TBM as described above for tunneling and the construction of the support structure, the construction method includes:

[0007] Assembly: Assemble the support segment linings in the assembly area. After the assembly positions in the assembly area are all assembled;

[0008] Tunneling: The open TBM tunnels for one stroke;

[0009] Repeat the assembly step and the tunneling step multiple times.

[0010] Preferably, any two adjacent support segment linings in the circumferential direction are arranged with a front-back offset, and the offset size is half of the width of the support segment lining. During assembly, in one of any two adjacent support segment linings at the front end of the support structure, compared with the other adjacent support segment lining, it forms a recessed part towards the rear end, and in each assembly step, only the support segment lining is assembled in the recessed part.

[0011] Preferably, both ends of the support segment in the length direction are constructed with isosceles triangle plates, and the edges where the two sides of the isosceles triangle plates intersect are located at the outermost sides of the support segment in the length direction.

[0012] Preferably, the gap between the support structure formed by the support segments and the inner wall of the surrounding rock gradually increases from bottom to top.

[0013] Preferably, the outer contour line of the support structure and the bottom of the inner contour line of the surrounding rock are tangent.

[0014] Preferably, the width of the support segment is 90 cm, and the excavation distance per time is 45 cm.

[0015] Preferably, the width of the assembly area is 50 cm.

[0016] Preferably, the supporting segments are steel segments and supporting bottom segments, and adjacent supporting segments are fixedly connected.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The solution provided by the present invention realizes the overlap between the rear end of the shield and the front end of the support structure, preventing debris falling from the external surrounding rock from falling into the shield or the support structure from between the shield and the support structure, thereby ensuring the safety of internal personnel and equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the open TBM middle shield and its internal structure provided by an embodiment of the present invention;

[0021] Figure 2 is a structural diagram of the support structure;

[0022] Figure 3 A schematic diagram of a support structure consisting of multiple steel segments and a support base;

[0023] Figure 4 Theoretically, the relationship diagram between the inner contour line of the surrounding rock and the outer contour line of the supporting structure;

[0024] In the figure: 1-shield; 2-assembly area; 3-steel pipe segment; 4-depression; 5-support bottom plate; 6-outer contour line of support structure; 7-inner contour line of surrounding rock; 8-deformation space. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0027] Next, in conjunction with Figures 1 to 4 , the embodiments of the present invention will be described.

[0028] The present invention provides an open TBM, including: a shield 1 and a main body. The shield 1 is arranged around the main body. A part of the space near the rear end inside the shield 1 forms an assembly area 2, and the assembly area 2 is used to provide space for the assembly of support segments.

[0029] The solution provided by the present invention realizes the overlap between the rear end of the shield 1 and the front end of the support structure, avoiding sundries falling from the external surrounding rock from falling into the shield 1 or the support structure between the shield 1 and the support structure, thereby ensuring the safety of internal personnel and equipment.

[0030] Specifically, the size of the shield 1 is 5m to 5.5m, preferably 5.229m.

[0031] In some embodiments, only the part above the waist of the shield 1 needs to be lengthened, because the risk of falling rocks and the like in the part below the waist of the shield 1 is relatively small. The waist in this embodiment can be understood as the middle position in the height direction of the shield 1.

[0032] The present invention provides a construction method for a support structure during the tunneling of an open TBM, using the open TBM described in the above embodiments for tunneling and the construction of the support structure. The construction method includes:

[0033] Assembly: Assemble the support segments in the assembly area 2. After the assembly at all the assembly positions in the assembly area 2 is completed;

[0034] Tunneling: The open TBM tunnels one stroke;

[0035] Repeat the assembly step and the tunneling step multiple times.

[0036] The solution provided by the present invention realizes the lap joint between the rear end of the shield 1 and the front end of the support structure, avoiding sundries falling from the external surrounding rock from falling into the shield 1 or the support structure between the shield 1 and the support structure, thereby ensuring the safety of the internal personnel and equipment.

[0037] In some embodiments, any two adjacent support segments in the circumferential direction are arranged with a front-back offset, and the offset dimension is one-half of the width of the support segment. During assembly, in one of any two adjacent support segments at the front end of the support structure, the support segment forms a recessed portion 4 by being recessed towards the rear end compared to the other adjacent support segment. In each assembly step, only the support segment is assembled in the recessed portion 4.

[0038] Compared with the splicing method of aligning the support segments front-back and left-right, the offset arrangement method provided by this embodiment improves the stability of the support structure.

[0039] In some embodiments, isosceles triangle plates are constructed at both ends of the support segment in the length direction. The edge where the two waists of the isosceles triangle plate intersect is located on the outermost side in the length direction of the support segment, and the isosceles triangle plate is an arc-shaped plate.

[0040] As Figure 2 shown, this embodiment achieves the purpose of accurately positioning each support segment to be spliced during the splicing process, improving the construction quality.

[0041] In some embodiments, the gap between the support structure enclosed by the support segments and the inner wall of the surrounding rock gradually increases from bottom to top.

[0042] This embodiment achieves the purpose of yielding support, that is, the support structure reserves a surrounding rock deformation space 8, so that after the surrounding rock produces a certain deformation, it acts on the support segment again to form a yielding support, reducing the force of the surrounding rock on the support segment, thereby improving stability. The above-mentioned surrounding rock deformation can be regarded as a process of releasing internal stress. After the internal stress of the surrounding rock is released, the force on the support segment will be greatly reduced.

[0043] Furthermore, this realizes the purpose of lightweight design of the steel segment 3, so that a steel segment 3 with a relatively thin thickness is sufficient to support the external surrounding rock, thereby reducing the cost of the support structure.

[0044] In some embodiments, the outer contour line 6 of the support structure is tangent to the bottom of the inner contour line 7 of the surrounding rock.

[0045] In some embodiments, the width of the support segment is 90 cm, and the travel distance for each tunneling is 45 cm.

[0046] This embodiment provides a width of the support segment. It can be understood that regardless of the width of the support segment, the travel distance for each tunneling is half of its width. When the width of the support segment is 2a, the travel distance for each tunneling is a.

[0047] In some embodiments, the width of the assembly area 2 is 50 cm. That is, compared with the existing open TBM, the shield in the open TBM of the embodiment of the present invention only needs to be lengthened by 50 cm.

[0048] This embodiment is directed to an embodiment where the width of the support segment is 90 cm and the travel distance for each tunneling is 45 cm. It can be understood that when the travel distance for tunneling is a, the width of the assembly area 2 is greater than a.

[0049] In some embodiments, the support segment includes a steel segment 3 and a support bottom film 5, and adjacent support segments are fixedly connected.

[0050] Specific examples are used in the present invention to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A method for constructing a support structure during open TBM excavation, characterized by: An open TBM is used for tunneling and support structure construction. The open TBM includes a shield and a main body. The shield is arranged around the main body. The space near the rear end of the shield forms an assembly area, which is used to provide space for assembling support segments. The construction method includes: Assembling: assembling the support segments in the assembly area, and after all the assembly positions in the assembly area are assembled; Excavation: Open TBM excavates one stroke; Repeat the assembly steps and excavation steps multiple times; Any two adjacent supporting segments in the circumferential direction are staggered front to back, and the staggered size is half of the width of the supporting segment. During assembly, one of the two adjacent supporting segments at the front end of the support structure is recessed toward the rear end compared to the other adjacent supporting segment to form a recessed portion. In each assembly step, the supporting segment is assembled only in the recessed portion. Isosceles triangle plates are constructed at both ends of the supporting segment in the length direction, and the edges where the two waists of the isosceles triangle plates intersect are located at the outermost sides of the supporting segment in the length direction. The width of the supporting segment is 2a, and the stroke of each excavation is a.

2. The construction method of the support structure during open TBM excavation according to claim 1 is characterized in that: The gap between the support structure formed by the support segments and the inner wall of the surrounding rock gradually increases from bottom to top.

3. The construction method of the support structure during open TBM excavation according to claim 2 is characterized in that: The outer contour line of the supporting structure is tangent to the bottom of the inner contour line of the surrounding rock.

4. The method for constructing a support structure during open TBM excavation according to claim 1, characterized in that: The width of the support segment is 90cm, and the excavation distance is 45cm each time.

5. The construction method of the support structure during open TBM excavation according to claim 4 is characterized in that: The width of the assembly area is 50 cm.

6. The construction method of the support structure during open TBM excavation according to claim 1 is characterized in that: The supporting segments are steel segments and supporting bottom segments, and adjacent supporting segments are fixedly connected.

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