Open type TBM and construction method of supporting structure during tunneling of open type TBM

Abstract

The invention discloses an open-type TBM and a construction method of a supporting structure during tunneling of the open-type TBM, and relates to the technical field of open-type TBMs, the open-type TBM comprises a shield and a main body, the shield is arranged around the main body, a part of space, close to the rear end, in the shield forms an assembly area, and the assembly area is used for providing space for assembly of supporting segments. The construction method comprises the steps that splicing is conducted, specifically, the supporting duct pieces are spliced in a splicing area, and splicing is conducted on the splicing positions in the splicing area; tunneling is conducted, specifically, the open-type TBM conducts tunneling for one stroke; and the splicing step and the tunneling step are repeated for multiple times. According to the scheme, lap joint of the rear end of the shield and the front end of the supporting structure is achieved, sundries falling from external surrounding rock are prevented from falling into the shield or the supporting structure from the position between the shield and the supporting structure, and then safety of internal personnel and equipment is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of open TBM, and in particular to an open TBM and a construction method of a supporting structure thereof during excavation. Background Art

[0002] The existing open TBM shield is short in design. During excavation, it can only cover the main components and cannot provide space for the installation of steel segments. During construction, the steel segments are assembled to form a cylindrical support structure. 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 no overlap is achieved. This results in the soil and rocks that fall after the deformation of the surrounding rock easily falling into the shield during construction (excavation or other construction processes, such as drilling, support, etc.), which can easily cause injuries to people 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 of a supporting structure during excavation thereof, so as to solve the problems existing in the above-mentioned prior art and improve the safety of construction.

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

[0005] The present invention provides an open TBM, comprising: a shield and a main body, wherein the shield is arranged around the main body, and a partial space near the rear end of the shield forms an assembly area, and the assembly area is used to provide space for assembling supporting segments.

[0006] The present invention provides a method for constructing a support structure during an open TBM excavation, using the open TBM as described above to perform excavation and construction of a support structure, the construction method comprising:

[0007] Assembling: assembling the supporting segments in the assembly area, after all the assembly positions in the assembly area are assembled;

[0008] Excavation: The open TBM excavates one stroke;

[0009] Repeat the assembly steps and excavation steps multiple times.

[0010] Preferably, 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 supporting segments at the front end of any two adjacent supporting segments of the supporting structure is recessed toward the rear end to form a recessed portion compared to the other adjacent supporting segment. In each assembly step, the supporting segment is assembled only in the recessed portion.

[0011] Preferably, isosceles triangle plates are constructed at both ends of the support 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 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 is tangent to the bottom of the inner contour line of the surrounding rock.

[0014] Preferably, the width of the supporting 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 plates, 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 supporting structure, preventing debris falling from the external surrounding rock from falling into the shield or the supporting structure from between the shield and the supporting 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 drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

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

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

[0022] Figure 3 A structural schematic diagram of a circle of support structure composed of multiple steel pipe segments and a support bottom plate;

[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 DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Combine the following Figures 1 to 4 , describing an embodiment of the present invention.

[0028] The present invention provides an open TBM, comprising: a shield 1 and a main body, wherein the shield 1 is arranged around the main body, and a partial space near the rear end of the shield 1 forms an assembly area 2, and the assembly area 2 is used to provide space for assembling 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 supporting structure, preventing debris falling from the external surrounding rock from falling into the shield 1 or the supporting structure from between the shield 1 and the supporting structure, thereby ensuring the safety of internal personnel and equipment.

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

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

[0032] The present invention provides a method for constructing a support structure during an open TBM excavation, using the open TBM described in the above embodiment to perform excavation and construction of a support structure, the construction method comprising:

[0033] Assembling: assembling the support segments in the assembly area 2, after all the assembly positions in the assembly area 2 are assembled;

[0034] Excavation: The open TBM excavates one stroke;

[0035] Repeat the assembly steps and excavation steps multiple times.

[0036] The solution provided by the present invention realizes the overlap between the rear end of the shield 1 and the front end of the supporting structure, preventing debris falling from the external surrounding rock from falling into the shield 1 or the supporting structure from between the shield 1 and the supporting structure, thereby ensuring the safety of internal personnel and equipment.

[0037] In some embodiments, any two adjacent support segments in the circumferential direction are staggered front to back, and the staggered size is half of the width of the support segment. During assembly, one of the two adjacent support segments at the front end of the support structure is recessed toward the rear end compared to the other adjacent support segment to form a recessed portion 4. In each assembly step, the support segment is assembled only in the recessed portion 4.

[0038] Compared with a splicing method of aligning the support segments front to back and left to right, the staggered arrangement provided in 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, and the edges where the two sides of the isosceles triangle plate intersect are located at the outermost sides of the support segment in the length direction, and the isosceles triangle plate is an arc-shaped plate.

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

[0041] In some embodiments, 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.

[0042] This embodiment achieves the purpose of pressure-yielding support, that is, the supporting structure reserves a surrounding rock deformation space 8, so that after the surrounding rock produces a certain deformation, it acts on the supporting segment to form pressure-yielding support, reducing the force of the surrounding rock on the supporting 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, it will greatly reduce the force on the supporting segment.

[0043] Furthermore, this achieves the lightweight design purpose of the steel pipe segment 3, so that the thinner steel pipe segment 3 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 supporting structure and the inner contour line 7 of the surrounding rock are tangent at the bottom.

[0045] In some embodiments, the width of the support segment is 90 cm, and the distance traveled per excavation is 45 cm.

[0046] This embodiment provides a width of a supporting segment. It can be understood that no matter how large the width of the supporting segment is, the excavation distance of each excavation is half of its width. When the width of the supporting segment is 2a, the excavation distance of each excavation 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 in the embodiment of the present invention only needs to be lengthened by 50 cm.

[0048] This embodiment is directed to an embodiment in which the width of the supporting segment is 90 cm and the excavation distance is 45 cm each time. It can be understood that when the excavation distance is a, the width of the assembly area 2 is greater than a.

[0049] In some embodiments, the supporting segments are steel segments 3 and supporting bottom plates 5, and adjacent supporting segments are fixedly connected.

[0050] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An open TBM, characterized by: include: A shield and a main body, wherein the shield is arranged around the main body, and a partial space near the rear end of the shield forms an assembly area, and the assembly area is used to provide space for assembling supporting segments.

2. A construction method for a support structure during open TBM excavation, characterized in that: The open TBM of claim 1 is used for excavation and construction of a support structure, and the construction method includes: Assembling: assembling the supporting segments in the assembly area, after all the assembly positions in the assembly area are assembled; Excavation: The open TBM excavates one stroke; Repeat the assembly steps and excavation steps multiple times.

3. The construction method of the support structure during open TBM excavation according to claim 2 is characterized in that: Any two adjacent supporting segments in the circumferential direction are staggered front and back, and the staggered size is half of the width of the supporting segment. During assembly, one of the supporting segments at the front end of any two adjacent supporting segments of the supporting structure is recessed toward the rear end to form a recessed portion compared to the other adjacent supporting segment. In each assembly step, the supporting segment is assembled only in the recessed portion.

4. The construction method of the support structure during open TBM excavation according to claim 2 is characterized in that: Both ends of the support segment in the length direction are constructed with isosceles triangle plates, and the edges where the two waists of the isosceles triangle plates intersect are located at the outermost sides of the support segment in the length direction.

5. The construction method of the support structure during open TBM excavation according to claim 2 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.

6. The construction method of the support structure during open TBM excavation according to claim 5 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.

7. The construction method of the support structure during open TBM excavation according to claim 3 is characterized by: The width of the supporting segment is 2a, and the distance traveled each time is a.

8. The construction method of the support structure during open TBM excavation according to claim 7 is characterized in that: The width of the supporting segment is 90cm, and the excavation distance each time is 45cm.

9. The construction method of the support structure during open TBM excavation according to claim 8, characterized in that: The width of the assembly area is 50 cm.

10. The construction method of the support structure during open TBM excavation according to claim 2, characterized in that: The supporting segments are steel segments and supporting bottom plates, and adjacent supporting segments are fixedly connected.

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