Hole opening structure of tunnel segment and construction method of hole opening structure

Abstract

The invention relates to a holing structure of a tunnel segment and a construction method thereof, the holing structure is used for holing of the tunnel segment on a main tunnel, the holing structure comprises a reinforcing member fixed on the inner side of the tunnel segment of the main tunnel, and the reinforcing member is connected with at least two rings of the tunnel segment; the reinforcing component is provided with a cutting part, and the cutting part corresponds to the edge of at least part of the holed area of the tunnel segment so as to reinforce the strength of the tunnel segment on the periphery of the holed area. The reinforcing member covers and is fixed on the surface of the tunnel segment, so that the wall surface of the main tunnel can be supported and positioned. The reinforcing component can support and reinforce the tunnel segment in the hole opening process and after subsequent hole opening is completed, and the stability and construction safety of the tunnel segment are kept.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and in particular to a hole-opening structure for tunnel segments and a construction method thereof. Background Art

[0002] During the construction of the main tunnel, special segments with a hole-opening area are pre-assembled in advance. The special segments form the hole-opening area of the connecting passage or the side passage. Among them, the structural strength of the special segments at the hole-opening area is smaller than that of the conventional tunnel segments. No high-strength members such as steel reinforcement cages are provided in the hole-opening area of the special segments to avoid damaging the tunneling cutter head. For example, the published document with the publication number CN113338993A provides a connecting passage reinforced ring beam structure and a construction method thereof.

[0003] However, under some special conditions, based on on-site construction or special design requirements, when it is necessary to carry out hole-opening tunneling in the already assembled main tunnel, since the existing tunnel segments have high strength and a steel reinforcement cage inside, it is difficult for the tunneling cutter head to directly break through the main tunnel segments, resulting in the technical problem that it is difficult to adopt the existing connecting passage hole-opening construction method. Therefore, improvement is needed. Summary of the Invention

[0004] To overcome the problems existing in the related art, an embodiment of the present invention provides a hole-opening structure for tunnel segments and a construction method thereof, so as to solve the technical problems that it is difficult to directly open a hole in the side passage in the main tunnel and the strength of the tunnel segments decreases after the hole is broken.

[0005] According to the first aspect of the embodiment of the present invention, a hole-opening structure for tunnel segments is provided, which is used for opening a hole in the tunnel segments of the main tunnel. The hole-opening structure includes: A strengthening member is fixed to the inner side of the tunnel segments of the main tunnel, and the strengthening member is connected to at least two rings of the tunnel segments; The strengthening member is provided with a cutting part, and the cutting part corresponds to the edge of at least a part of the hole-opening area of the tunnel segments to reinforce the strength of the tunnel segments around the hole-opening area.

[0006] In one embodiment, the width of the strengthening member is greater than the width of at least two rings of the tunnel segments. The strengthening member is provided with a plurality of through welding holes, and the planted bars of the tunnel segments are inserted into the corresponding welding holes and welded and fixed to the strengthening member.

[0007] In one embodiment, the tunnel segments are provided with glass fiber bars in the area corresponding to the hole-opening area; or, A number of weakening holes are opened in the tunnel segments corresponding to the hole-opening area, and the weakening holes correspondingly cut off the nodes or steel bars of the steel reinforcement cage in the tunnel segments.

[0008] In one embodiment, the strengthening member is attached to the middle tunnel segment, and both sides of the strengthening member are welded to adjacent two tunnel segments respectively.

[0009] According to the second aspect of the embodiments of the present invention, a construction method for a tunnel segment hole-opening structure is provided, which is applied to the hole-opening structure as described above. The construction method includes: Fix the strengthening member to the tunnel segment of the main tunnel; Weaken the tunnel segment corresponding to the hole-opening area; Make the cutting part of the strengthening member form at least part of the edge of the hole-opening area, and the strengthening member strengthens the surrounding area of the hole-opening area.

[0010] In one embodiment, the weakening of the tunnel segment corresponding to the hole-opening area includes: Drill weakening holes in the tunnel segment of the hole-opening area, and the weakening holes correspondingly cut off the nodes or steel bars of the steel reinforcement cage inside the tunnel segment; Fill the weakening holes with easily machinable materials.

[0011] In one embodiment, the weakening of the tunnel segment corresponding to the hole-opening area includes: The tunnel segment in the hole-opening area includes a reserved easily machinable part, and glass fiber bars are arranged in the easily machinable part; Cover the easily machinable part with the strengthening member; Before tunneling construction in the hole-opening area, cut the strengthening member to form a cutting part surrounding the hole-opening area.

[0012] In one embodiment, the fixing of the strengthening member to the tunnel segment of the main tunnel includes: Perform steel bar planting on the tunnel segments around the hole-opening area; Open welding holes on the strengthening member, and the welding holes correspond to the steel bar planting; Attach the strengthening member to the tunnel segment, and insert the steel bar planting into the welding holes; Weld and fix the steel bar planting to the strengthening member.

[0013] In one embodiment, the correspondence between the welding holes and the steel bar planting includes: Determine the steel bar planting positions on the tunnel segments according to the hole positions of the strengthening member; Drill holes on the tunnel segments according to the diameter of the implanted steel bars; Perform steel bar planting, and conduct a pull-out test after the steel bar planting is completed; Attach the strengthening member to the tunnel segment, and insert the steel bar planting correspondingly into the welding holes of the strengthening member.

[0014] In one embodiment, the fixed connection of the strengthening member to the tunnel segment of the main tunnel includes: Align the cutting portion of the strengthening member with the edge of the opening area; Connect the two ends of the strengthening member to two spaced tunnel segments respectively to support the intermediate tunnel segment between the two tunnel segments.

[0015] The technical solution provided by the embodiment of the present invention may include the following beneficial effects: The strengthening member covers and is fixed on the surface of the tunnel segment, so as to be able to support and strengthen the wall surface of the main tunnel. The strengthening member can provide support and reinforcement for the tunnel segment during the opening process and after the subsequent opening is completed, maintaining the stability and construction safety of the tunnel segment. The strengthening member spans multiple rings of tunnel segments, constituting a large-area regional strengthening instead of the traditional local strengthening, thereby expanding the support and connection range and improving the overall strength of the main tunnel in the corresponding area. The cutting portion corresponds to the edge of the opening area, and can effectively control and limit the range of the opening area. Description of the Drawings

[0016] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention.

[0017] Figure 1 is a schematic structural view showing the strengthening member fittingly fixed to the tunnel segment according to an embodiment.

[0018] Figure 2 is a schematic structural view showing the punching weakening in the opening area according to an embodiment.

[0019] Figure 3 is a partial sectional view showing the strengthening member fixed to the tunnel segment by planting steel bars according to an embodiment.

[0020] Figure 4 is a schematic view showing the local strengthening of the tunnel segments on both sides connected by the strengthening member according to an embodiment.

[0021] Figure 5 is a flowchart showing the construction method according to an embodiment.

[0022] In the figure, tunnel segment 10; opening area 11; weakening hole 12; planted steel bar 13; strengthening member 20; cutting portion 21; welding hole 22. Detailed Embodiments

[0023] In the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms used to describe the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] As Figures 1 to 4 shown, the present invention provides a hole-opening structure for a tunnel segment 10, which is used for hole-opening of the tunnel segment 10 on the main tunnel. Among them, at least part of the tunnel segment 10 in the hole-opening area 11 includes concrete and a steel reinforcement cage located in the concrete.

[0025] The hole-opening structure includes a strengthening member 20, and the strengthening member 20 is a thick steel plate adapted to the arc-shaped bending of the main tunnel wall surface, and the thick steel plate is attached to the surface of the main tunnel. The strengthening member 20 is fixed to the inner side wall surface of the tunnel segment 10 of the main tunnel, so as to be able to support and strengthen the main tunnel.

[0026] Optionally, the strengthening member includes a plate-shaped structural member, and among them, the elastic modulus of the strengthening member is not less than 200 GPa. Preferably, the strengthening member is configured as an aluminum alloy plate, a fiber composite material plate, an engineering plastic reinforced plate, or a steel plate. Further preferably, the strengthening member includes a strengthening plate made of a metal material. For example, the strengthening member uses a steel plate, which has low cost, high strength, and easy processability.

[0027] The width of the strengthening member 20 in the direction of the main tunnel center line is greater than the width of the tunnel segment 10 of two rings or more. The strengthening member 20 connects at least two rings of tunnel segments 10 to form a regional large-area strengthening, rather than the traditional single-ring local strengthening, so as to expand the support and connection range and improve the overall strength of the main tunnel in the corresponding area.

[0028] The strengthening member 20 is provided with a cutting part 21, and the cutting part 21 is a hole mechanism or a notch mechanism penetrating the strengthening member 20. The cutting part 21 corresponds to the edge of at least part of the hole-opening area 11 of the tunnel segment 10 to reinforce the strength of the tunnel segment 10 around the hole-opening area 11. Among them, the cutting part 21 can be pre-cut and processed according to the construction area of the tunnel segment 10 or cut and processed after the strengthening member 20 and the tunnel segment 10 are fixed.

[0029] During the hole-opening process and after the subsequent hole-opening is completed, the strengthening member 20 can provide support and reinforcement for the tunnel segment 10, and maintain the stability and construction safety of the tunnel segment 10.

[0030] Among them, in the center line direction of the main tunnel, the width of the strengthening member 20 is greater than the width of at least two rings of tunnel segments 10. The support range of the strengthening member 20 for the tunnel segments 10 is greater than the opening range, so as to establish a support structure for the tunnel segments 10 around the opening area 11, thereby forming a regional overall strengthening. For example, if the opening area 11 is two rings of tunnel segments 10, the strengthening member 20 can strengthen the areas of two rings, three rings, four rings, five rings, etc. of the tunnel segments 10. Or, if the opening area 11 is three rings of tunnel segments 10, the strengthening member 20 can strengthen the areas of three rings, four rings, five rings, six rings, etc. of the tunnel segments 10.

[0031] The strengthening member 20 is fixedly connected to the tunnel segment 10. In one embodiment, the strengthening member 20 is provided with a plurality of through welding holes 22, and the welding holes 22 penetrate through the strengthening member 20 and spread along the periphery of the cutting part 21 to form a multi-point connection distribution.

[0032] Reinforcing bars are implanted on the tunnel segment 10. Among them, the range and position of the implanted reinforcing bars 13 match those of the welding holes 22. The implanted reinforcing bars 13 of the tunnel segment 10 are inserted into the corresponding welding holes 22 and welded and fixed to the strengthening member 20, thereby tightly connecting the strengthening member 20 and the tunnel segment 10.

[0033] Optionally, the strengthening member 20 is fixedly connected to the tunnel segment 10, and the strengthening member 20 is welded to the steel structure on the tunnel segment 10 to form an integral structure. Or, the strengthening member 20 is provided with connection holes, and fasteners pass through the connection holes and are locked and connected to the tunnel segment 10.

[0034] After the strengthening member 20 is fixedly connected to the tunnel segment 10, the strengthening member 20 needs to determine the cutting part 21 area as the opening area 11.

[0035] In one embodiment, the strengthening member 20 is a complete steel plate structure covering the surface of the tunnel segment 10, so as to be able to perform regional strengthening. Among them, within the coverage range of the strengthening member 20, there is an opening area 11 of the tunnel segment 10. Further, glass fiber bars are arranged in the area of the tunnel segment 10 corresponding to the opening area 11.

[0036] After the strengthening member 20 is fixed, regional strengthening is realized to keep the main tunnel stable. Before the start of the opening construction, the strengthening member 20 covering the surface of the tunnel segment 10 is cut, so as to form a cutting part 21 on the strengthening member 20 corresponding to the opening area 11. The cutting range can be determined according to the opening area 11, and it can be carried out after other preparatory work is completed, greatly improving the construction efficiency and safety.

[0037] In another embodiment, a cutting portion 21 is preset on the strengthening member 20, and then the strengthening member 20 is fixedly covered on the surface of the tunnel segment 10. The tunnel segment 10 in the opening area 11 corresponding to the cutting portion 21 is a standard segment; alternatively, the tunnel segment 10 in the opening area 11 corresponding to the cutting portion 21 is a combination of a tunnel segment 10 with partial glass fiber bars and a standard segment.

[0038] Before the start of the opening construction, a number of weakening holes 12 are opened in the tunnel segment 10 corresponding to the opening area 11, and the weakening holes 12 correspondingly cut off the joints or steel bars of the steel reinforcement cage inside the tunnel segment 10. The weakening holes 12 are drilled in the tunnel segment 10 by a drilling device, so as to weaken the strength of the tunnel segment 10 to facilitate the tunneling process, such as the weakening holes 12 being processed by a water drill.

[0039] Among them, the drilling positions of the weakening holes 12 are designed based on the steel reinforcement cage inside the segment to improve the weakening efficiency and reduce the destructive threat to the tunneling cutterhead caused by the steel reinforcement cage.

[0040] In one embodiment, the strengthening member 20 is used to strengthen the area between two spaced tunnel segments 10, so as to locally enhance the opening area 11 between three consecutive segments.

[0041] Optionally, the strengthening member 20 is attached to the middle tunnel segment 10, and the two sides of the strengthening member 20 are respectively welded to the adjacent two tunnel segments 10. An opening is made in three consecutive tunnel segments 10. Among them, the middle tunnel segment 10 needs to be locally strengthened to keep the opening area 11 stable. The strengthening member 20 is attached to the middle tunnel segment 10 and is fixedly connected to the tunnel segment 10 at both ends to form local strengthening. The strengthening member 20 of this structure forms local regional strengthening to stabilize the structure of the opening area 11.

[0042] As a local strengthening structure, optionally, the two side tunnel segments 10 are standard segments, and there is no steel reinforcement cage in the area to be strengthened in the middle tunnel segment 10, so the strengthening member 20 is used for strengthening to improve the overall strength of the opening area 11.

[0043] As Figures 1 to 5 shown, the present application also provides a construction method, which is applied to perform an opening operation at a corresponding position of the main tunnel. Among them, there is no reserved opening structure in the corresponding area of the main tunnel or the reserved hole does not meet the requirements, and the opening of the corresponding area of the main tunnel can be realized through the operation of the construction method.

[0044] The construction method includes: S101. Fix the strengthening member 20 to the tunnel segment 10 of the main tunnel in a fixed connection. The strengthening member 20 is an arc-shaped bent steel plate structure to fit and cover the surface of the main tunnel. The strengthening member 20 and the tunnel segment 10 are fixed integrally, and the strengthening member 20 provides local strengthening to the covered area.

[0045] S102. Weaken the tunnel segment 10 corresponding to the opening area 11. Optionally, weakening the tunnel segment 10 corresponding to the opening area 11 includes that the tunnel segment 10 itself adopts a weakening structure. For example, the tunnel segment 10 is made of easy-to-cut strip materials combined with concrete inside, such as the easy-to-cut strip materials are configured as glass fiber bars. Optionally, weakening the tunnel segment 10 corresponding to the opening area 11 includes drilling and weakening the tunnel segment 10 to reduce the overall strength of the tunnel segment 10 in the opening area 11.

[0046] S103. The cutting part 21 of the strengthening member 20 forms at least part of the edge of the opening area 11, and the strengthening member 20 strengthens the surrounding area of the opening area 11.

[0047] The strengthening member 20 is fixedly attached to the surface of the main tunnel, and the cutting part 21 is arranged around the opening area 11 to strengthen the edge strength of the opening area 11. Among them, the cutting part 21 can be pre-cut and processed according to the construction area of the tunnel segment 10 or cut and processed after the strengthening member 20 and the tunnel segment 10 are fixed.

[0048] During the opening process and after the subsequent opening is completed, the strengthening member 20 can provide support and reinforcement for the tunnel segment 10, and maintain the stability and construction safety of the tunnel segment 10.

[0049] In step S102, weakening the tunnel segment 10 corresponding to the opening area 11 includes drilling and weakening the tunnel segment 10. Among them, weakening the tunnel segment 10 corresponding to the opening area 11 includes the following steps: Drill weakening holes 12 in the tunnel segment 10 of the opening area 11, and the weakening holes 12 correspondingly cut off the nodes or steel bars of the steel reinforcement cage inside the tunnel segment 10. In this embodiment, there is a steel reinforcement cage formed by bundling multiple steel bars inside the tunnel segment 10, and the concrete accommodates and covers the steel reinforcement cage. The drilling equipment drills holes in the tunnel segment 10, thereby breaking the nodes of the steel reinforcement cage, making the steel reinforcement cage form fractured and discrete steel bar segments, and the influence of the steel bar segments on the tunneling cutter head to break the tunnel segment 10 is small. Preferably, the drilling on the tunnel segment 10 is in an array, and among them, the array can be configured as a grid dot array or a circular dot array formed by multiple holes.

[0050] Fill the weakening hole 12 with a free-cutting material, which can be concrete or other filling materials. The free-cutting material fills the weakening hole to maintain the internal pressure balance of the tunnel segment 10, avoid uneven cutting during the cutting process of the tunnel segment 10, and reduce the risk of water gushing outside the tunnel segment 10.

[0051] Among them, the strengthening member 20 is pre-opened with a through-hole-shaped cutting part 21. The strengthening member 20 strengthens the periphery of the hole-opening area 11 and extends along the cutting part 21 in the peripheral direction. In this embodiment, the hole-opening area 11 can be defined by the range of the cutting part 21.

[0052] In step S102, the weakening of the tunnel segment 10 corresponding to the hole-opening area 11 includes that the tunnel segment 10 inside is made of a free-cutting strip material combined with concrete. Among them, the weakening of the tunnel segment 10 corresponding to the hole-opening area 11 includes the following steps: The tunnel segment 10 in the hole-opening area 11 includes a reserved free-cutting part, and glass fiber bars are arranged in the free-cutting part. The free-cutting part forms a part of the tunnel segment 10, and a steel cage structure is not arranged in the free-cutting part, and the tunneling cutter head can directly tunnel the free-cutting part.

[0053] Cover the free-cutting part with the strengthening member 20. The strengthening member 20 is an arc-shaped plate structure to fit and strengthen the tunnel segment 10. Among them, the strengthening member 20 can jointly strengthen the free-cutting part and the surrounding tunnel segment 10. When no tunneling construction is carried out, the strengthening member 20 can improve the inner support effect of the tunnel segment 10. Preferably, the range of the free-cutting part is greater than or equal to the hole-opening area 11, and the covering area of the strengthening member 20 extends from the free-cutting part to the periphery, so as to form area support.

[0054] Before the tunneling construction in the hole-opening area 11, cut the strengthening member 20 to form a cutting part 21 surrounding the hole-opening area 11. In this embodiment, the strengthening member 20 is a complete plate structure, and the strengthening member 20 provides inner support for the free-cutting part to improve the structural stability of the opening in the main tunnel.

[0055] The strengthening member 20 covers the surface of the main tunnel. After determining the hole-opening area 11 of the main tunnel, the strengthening member 20 cuts a hole to form a cutting part 21. The cutting part 21 is arranged around the free-cutting part and defines the free-cutting part.

[0056] In step S101, fixedly connect the strengthening member 20 with the tunnel segment 10 of the main tunnel. Optionally, the strengthening member 20 and the tunnel segment 10 of the main tunnel are fixedly connected in a covering manner to form a multi-point connection. Optionally, the strengthening member 20 and the tunnel segment 10 of the main tunnel are locally connected to form a regional strengthening connection.

[0057] In one embodiment, the strengthening member 20 and the tunnel segment 10 of the main tunnel are fixedly connected in a covering manner, including the following steps: S201, implant steel bars 13 in the tunnel segment 10 around the opening area 11. After determining the opening area 11, distribute them at intervals along the periphery of the opening area 11, and the ends of the implanted steel bars 13 extend beyond the surface of the tunnel segment 10. Preferably, multiple implanted steel bars 13 are arranged around the opening area 11 to form a circumferential connection with the periphery of the strengthening member 20; alternatively, multiple implanted steel bars 13 are located at the intersections or the centers of small grids of a grid-shaped area, and the opening area 11 is located within the grid-shaped area.

[0058] S202, open welding holes 22 on the strengthening member 20, and the welding holes 22 correspond to the implanted steel bars 13. The opening positions of the welding holes 22 match the implanted steel bars 13, and the diameter of the welding holes 22 is larger than the outer diameter of the implanted steel bars 13.

[0059] S203, attach the strengthening member 20 to the tunnel segment 10, and insert the implanted steel bars 13 into the welding holes 22.

[0060] S204, weld and fix the implanted steel bars 13 and the strengthening member 20.

[0061] The strengthening member 20 and the implanted steel bars 13 are welded and fixed into one body, so that the strengthening member 20 is fixedly connected to the tunnel segment 10. The multi-point connection positions can enable the same strengthening member 20 to connect multiple rings of tunnel segments 10 into one body, further improving the connection strength between the tunnel segments 10 and the edge strength of the opening area 11.

[0062] In the above step S202, the welding holes 22 correspond to the implanted steel bars 13, and this corresponding process includes the following steps: Determine the steel bar implanting parts of the tunnel segment 10 according to the hole positions of the strengthening member 20; Drill holes in the tunnel segment 10 according to the diameter of the implanted steel bars; Perform steel bar implantation 13, and conduct a pull-out test after the steel bar implantation 13 is completed; Attach the strengthening member 20 to the tunnel segment 10, and insert the implanted steel bars 13 correspondingly into the welding holes 22 of the strengthening member 20.

[0063] Optionally, the strengthening member 20 is provided with multiple welding holes 22. When the strengthening member 20 is attached to the tunnel segment 10, the hole positions of the welding holes 22 can determine the steel bar implanting parts on the tunnel segment 10, thereby constructing one-to-one paired implanted steel bars 13. Optionally, the hole positions of the strengthening member 20 and the steel bar implanting parts of the tunnel segment 10 can be determined by the designed positions, and marked and positioned on the strengthening member 20 and the tunnel segment 10.

[0064] After the marking and positioning of the rebar planting parts are completed on the tunnel segment 10, the construction workers drill holes at the marked positions. The diameter and depth of the drilled holes are determined based on the diameter of the implanted rebar, and the damage to the tunnel segment 10 is reduced on the basis of ensuring the pulling-out effect. Among them, the rebar planting process can be implemented with reference to the existing technology and will not be elaborated here.

[0065] After the rebar 13 is planted on the tunnel segment 10, a pull-out test needs to be carried out on the implanted rebar so that the tensile strength of each rebar 13 meets the requirements. Correspondingly, after the strengthening member 20 and the rebar 13 are welded and fixed, the strengthening member 20 is fixed to the tunnel segment 10 through multiple rebars 13. The tunnel segment 10 and the strengthening member 20 are connected to each other and can support each other to achieve regional strengthening.

[0066] In the above embodiment, the strengthening member 20 is attached to the wall surface of the main tunnel, and the strengthening member 20 can be provided with a whole plate or a cutting part 21. The installation range of the strengthening member 20 is larger than the range of the opening area 11 to form a comprehensive covering strengthening structure.

[0067] In one embodiment, the strengthening member 20 further includes local regional strengthening for the opening area 11. Among them, the steps of fixedly connecting the strengthening member 20 to the tunnel segment 10 of the main tunnel include: Align the cutting part 21 of the strengthening member 20 to the edge of the opening area 11; Connect the two ends of the strengthening member 20 to two spaced tunnel segments 10 respectively to support the intermediate tunnel segment 10 between the two tunnel segments 10.

[0068] In three or four or more consecutive rings of tunnel segments 10, the strengthening member 20 connects the two outermost tunnels to locally strengthen the intermediate tunnel segment 10, reducing the contact area between the strengthening member 20 and the tunnel segment 10, and locally strengthening the edge of the opening area 11, greatly improving the bonding strength.

[0069] Preferably, the two ends of the strengthening member 20 are respectively connected to the corresponding tunnel segments 10 to form two-end connection. Preferably, the strengthening member 20 is welded to the tunnel segments 10 on both sides. For example, steel structure parts are embedded in the tunnel segments 10 on both sides or the tunnel segments on both sides are steel pipe segments. Or, the strengthening member 20 is welded to the steel parts of the tunnel segments 10 on both sides.

[0070] The strengthening member 20 locally strengthens the opening area 11 and fixes the spaced segments into a whole to achieve longitudinal connection, greatly improving the overall strength.

[0071] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The present application aims to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present invention.

Claims

1. An opening structure for tunnel segments, which is used for opening holes in tunnel segments on the main tunnel, and is characterized in that, The described hole-opening structure includes: Reinforcing members fixed to the inner side of the tunnel segments of the main tunnel, and the reinforcing members are connected to at least two rings of the tunnel segments; The reinforcing members are provided with cutting parts corresponding to the edges of at least part of the hole-opening area of the tunnel segments to reinforce the strength of the tunnel segments around the hole-opening area.

2. The hole-opening structure according to claim 1, wherein The width of the reinforcing members is greater than the width of at least two rings of the tunnel segments. The reinforcing members are provided with a plurality of through welding holes, and the inserted steel bars of the tunnel segments are inserted into the corresponding welding holes and welded and fixed to the reinforcing members.

3. The hole-opening structure according to claim 1, characterized in that Glass fiber bars are arranged in the area of the tunnel segments corresponding to the hole-opening area; or, A number of weakening holes are opened in the tunnel segments corresponding to the hole-opening area, and the weakening holes correspondingly cut off the nodes or steel bars of the steel bar cages inside the tunnel segments.

4. The hole-opening structure according to claim 1, characterized in that, The reinforcing members are attached to the middle tunnel segments, and the two sides of the reinforcing members are respectively welded to the adjacent two tunnel segments.

5. A construction method for a tunneling segment hole-opening structure, which is applied to the hole-opening structure described in any one of claims 1-4, and is characterized in that, The construction method includes: Fixing and connecting the reinforcing members to the tunnel segments of the main tunnel; Weakening the tunnel segments corresponding to the hole-opening area; Making the cutting parts of the reinforcing members form at least part of the edges of the hole-opening area, and the reinforcing members strengthen the surrounding area of the hole-opening area.

6. The construction method according to claim 5, characterized in that, The weakening of the tunnel segments corresponding to the hole-opening area includes: Drilling weakening holes in the tunnel segments in the hole-opening area, and the weakening holes correspondingly cut off the nodes or steel bars of the steel bar cages inside the tunnel segments; Filling the weakening holes with easily cuttable materials.

7. The construction method according to claim 5, characterized in that, The weakening of the tunnel segments corresponding to the hole-opening area includes: The tunnel segments in the hole-opening area include reserved easily cuttable parts, and glass fiber bars are arranged in the easily cuttable parts; Covering the easily cuttable parts with the reinforcing members; Before tunneling construction in the hole-opening area, cutting the reinforcing members to form cutting parts surrounding the hole-opening area.

8. The construction method according to claim 5, characterized in that, The fixing and connecting of the reinforcing members to the tunnel segments of the main tunnel includes: Inserting steel bars in the tunnel segments around the hole-opening area; Opening welding holes in the reinforcing members, and the welding holes correspond to the inserted steel bars; Attaching the reinforcing members to the tunnel segments, and inserting the inserted steel bars into the welding holes; Welding and fixing the inserted steel bars to the reinforcing members.

9. The construction method according to claim 8, characterized in that, The correspondence between the welding holes and the inserted steel bars includes: Determining the positions of the inserted steel bars on the tunnel segments according to the hole positions of the reinforcing members; Drilling holes in the tunnel segments according to the diameters of the inserted steel bars; Inserting steel bars, and performing a pull-out test after the steel bar insertion is completed; Attaching the reinforcing members to the tunnel segments, and inserting the inserted steel bars into the welding holes of the reinforcing members correspondingly.

10. The construction method according to claim 5, characterized in that, The fixing and connecting of the reinforcing members to the tunnel segments of the main tunnel includes: Aligning the cutting parts of the reinforcing members to the edges of the hole-opening area; Connecting the two ends of the reinforcing members to two spaced tunnel segments respectively to support the middle tunnel segment between the two tunnel segments.

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