Supporting structure for construction of local collapse section in tunnel hole

Abstract

The utility model provides a supporting structure for building a local collapse section in a tunnel hole, which comprises a first supporting component for supporting an undamaged steel arch and a second supporting component for supporting the first supporting component, the first supporting component is in an arc shape and is matched with the undamaged steel arch, and the second supporting component is in an arc shape and is matched with the undamaged steel arch. The first supporting assembly comprises a first end and a second end which are oppositely arranged in the arc length direction of the first supporting assembly, the first end is in lap joint with a tunnel arch foot, the second end extends towards a collapse cavity from the first end, one end of the second supporting assembly is in lap joint with a collapse body, and the other end of the second supporting assembly is supported at the bottom of the second end. A corrugated steel plate and I-shaped steel combined structure can be adopted as a temporary supporting structure, rapid assembly can be achieved, other parts are connected through bolts, assembly and disassembly are convenient, and the work efficiency is improved; according to the construction method, the initial support does not need to be dismantled on the whole section, the original completed initial lining structure can be fully utilized, expanding excavation of the tunnel is not needed, the construction risk is reduced, and the construction cost is greatly saved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnels, in particular to a supporting structure for constructing a local collapse section in a tunnel. Background Art

[0002] Landslides often occur during tunnel construction. Due to the diversity and complexity of the engineering geological environment in which the tunnel is located, there are various types of landslides. Among them, after the initial support is completed, landslides are prone to occur under the influence of various disturbances and surrounding rock stresses over time, resulting in damage to the initial support at local locations and the formation of collapsed cavities.

[0003] Generally speaking, for the construction of a tunnel with a local collapse section in the initial support section of the tunnel, the conventional means is to adjust the lining type and adopt a lining structure with a higher protection level to ensure the construction safety of the tunnel collapse section. However, such treatment measures take safety into consideration too much and ignore the convenience of construction. That is, if a higher level of lining type is adopted, the entire section of the initial support, including the undamaged initial support, must be removed, and the surrounding rock must be excavated. The construction is extremely inconvenient, increasing the construction risk while also increasing the cost of tunnel collapse treatment.

[0004] In view of this, it is necessary to propose a supporting structure for constructing a local collapse section in a tunnel to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main purpose of the utility model is to provide a supporting structure for constructing a local collapsed section in a tunnel, so as to solve the technical problems in the prior art of using a higher grade lining type for the construction of a local collapsed section in the initial support section of a tunnel, which results in inconvenient construction and high cost.

[0006] To achieve the above-mentioned purpose, the utility model provides a supporting structure for constructing a local collapsed section in a tunnel, comprising a first supporting assembly for supporting an undamaged steel arch frame and a second supporting assembly for supporting the first supporting assembly, wherein the first supporting assembly is arc-shaped and matches the undamaged steel arch frame, the first supporting assembly comprises a first end and a second end which are arranged opposite to each other along the direction of its own arc length, the first end is overlapped at the tunnel arch foot, and the second end extends from the first end toward the collapsed cavity; one end of the second supporting assembly is overlapped on the collapsed body, and the other end of the second supporting assembly is supported at the bottom of the second end.

[0007] Preferably, the second supporting assembly includes a vertical I-beam, a first connecting plate connected to the top of the vertical I-beam, and a first channel steel connected to the bottom of the vertical I-beam, the first channel steel is laid on the landslide body and extends along the extension direction of the tunnel, and the first connecting plate is connected to the first supporting assembly.

[0008] Preferably, the first supporting assembly includes a first corrugated steel plate and a second channel steel, the second channel steel is overlapped at the tunnel arch foot, and one end of the first corrugated steel plate is overlapped on the second channel steel; the first corrugated steel plate is formed with a connecting groove on the wall surface close to the surrounding rock, the bottom surface of the connecting groove is a plane, and the bottom surface of the connecting groove is provided with a first connecting hole for bolts to pass through, the first connecting plate is provided with a second connecting hole arranged one-to-one with the first connecting hole, and the first connecting plate is connected to the first corrugated steel plate by bolts passing through the first connecting hole and the second connecting hole.

[0009] Preferably, it also includes a third connecting plate connected to the end face of the other end of the first corrugated steel plate and a fourth connecting plate connected to the third connecting plate, the third connecting plate and the fourth connecting plate are connected and L-shaped, the third connecting plate is provided with a third connecting hole for bolts to pass through, and the fourth connecting plate is provided with a fourth connecting hole for bolts to pass through.

[0010] Preferably, the first supporting assembly further includes a second corrugated steel plate, a fifth connecting plate, and a sixth connecting plate, wherein the second corrugated steel plate is in an arc shape and matches the tunnel steel arch frame, the fifth connecting plate is connected to the end face of the second corrugated steel plate close to the first corrugated steel plate, the fifth connecting plate is provided with a fifth connecting hole arranged one-to-one corresponding to the third connecting hole, and the fifth connecting plate is connected to the third connecting plate by bolts penetrating the third connecting hole and the fifth connecting hole; the sixth connecting plate is connected to the fifth connecting plate, the fifth connecting plate and the sixth connecting plate are connected and are L-shaped, the sixth connecting plate is provided with a sixth connecting hole arranged one-to-one corresponding to the fourth connecting hole, and the fourth connecting plate is connected to the sixth connecting plate by bolts penetrating the fourth connecting hole and the sixth connecting hole.

[0011] Preferably, the second corrugated steel plate is provided with grouting holes.

[0012] Preferably, the vertical I-beam is an I20 I-beam.

[0013] Preferably, the second support assembly further comprises an oblique brace, one end of the oblique brace is connected to the bottom of the second support assembly, and the other end of the oblique brace is connected to the vertical I-beam.

[0014] Preferably, a seventh connecting plate is provided on both sides of the first corrugated steel plate along the extension direction of the tunnel, and a seventh connecting hole for bolts to pass through is opened on the seventh connecting plate, and two adjacent first corrugated steel plates are connected by bolts passing through the seventh connecting hole.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model provides a support structure for the construction of a local collapsed section in a tunnel, including a first support assembly for supporting an undamaged steel arch frame, and a second support assembly for supporting the first support assembly. The first support assembly is arc-shaped and matches the undamaged steel arch frame. The first support assembly includes a first end and a second end arranged relatively along its own arc length direction, the first end is overlapped at the tunnel arch foot, and the second end extends from the first end toward the collapsed cavity. One end of the second support assembly is overlapped on the collapsed body, and the other end of the second support assembly is supported at the bottom of the second end. The present application can use a combined structure of corrugated steel plates and I-beams as a temporary support structure, which can be quickly assembled, and the remaining parts are connected by bolts, which is convenient for installation and disassembly, and improves work efficiency; the present application does not require full-section removal of initial support, and makes full use of the original completed primary lining structure, without the need to expand the tunnel, which reduces construction risks on the one hand and greatly saves construction costs on the other hand; the present application can cooperate with phased cyclic construction, and the combined structure of corrugated steel plates and I-beams can be recycled, further saving engineering costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 This is one of the application scenario diagrams of the overall structure in one embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure after pouring the concrete filling layer in one embodiment of the utility model;

[0020] Figure 3 for Figure 1 A local enlarged schematic diagram of the A in FIG.

[0021] Figure 4 for Figure 1 A local enlarged schematic diagram of point B in FIG.

[0022] Figure 5It is a schematic structural diagram of the first corrugated steel plate in one embodiment of the utility model.

[0023] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0024] Description of Figure Numbers:

[0025] 10. First support assembly; 110. First end; 120. Second end; 130. First corrugated steel plate; 131. Connecting groove; 132. First connecting hole; 133. Seventh connecting plate; 134. Seventh connecting hole; 140. Second channel steel; 150. Second corrugated steel plate; 160. Fifth connecting plate; 170. Sixth connecting plate; 20. Second support assembly; 210. Vertical I-beam; 220. First connecting plate; 230. First channel steel; 240. Diagonal brace; 310. Third connecting plate; 320. Third connecting hole; 330. Fourth connecting plate; 340. Fourth connecting hole; 40. Collapse cavity; 50. Collapse body; 610. Undamaged steel arch frame; 620. Newly built steel arch frame; 70. Concrete filling layer. DETAILED DESCRIPTION

[0026] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as described in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0030] Please refer to the attached Figures 1 to 5 In one embodiment of the utility model, a supporting structure for constructing a local collapsed section in a tunnel comprises a first supporting assembly 10 for supporting an undamaged steel arch frame 610 and a second supporting assembly 20 for supporting the first supporting assembly 10, wherein the first supporting assembly 10 is arc-shaped and matches the undamaged steel arch frame 610, the first supporting assembly 10 comprises a first end 110 and a second end 120 which are arranged opposite to each other along the arc length direction thereof, the first end 110 is overlapped at the tunnel arch foot, and the second end 120 extends from the first end 110 toward the collapsed cavity 40; one end of the second supporting assembly 20 is overlapped on the collapsed body 50, and the other end of the second supporting assembly 20 is supported at the bottom of the second end 120.

[0031] like Figure 1 As shown, the first support component 10 is arc-shaped and matches the undamaged steel arch frame 610, so that the first support component can support the bottom of the undamaged steel arch frame 610 as much as possible, and the second end 120 and the collapsed cavity 40 can be at a certain distance, preferably, corresponding to the transition position between the undamaged steel arch frame 610 and the damaged steel arch frame. The second support component 20 of the first support component 10 together constitutes a temporary support component, which can stabilize the overall structure to facilitate subsequent processes.

[0032] As a preferred embodiment, Figure 1 and Figure 3 The second support assembly 20 includes a vertical I-beam 210, a first connecting plate 220 connected to the top of the vertical I-beam 210, and a first channel steel 230 connected to the bottom of the vertical I-beam 210. The first channel steel 230 is laid on the landslide body 50 and extends along the extension direction of the tunnel. The first connecting plate 220 is connected to the first support assembly 10. As a preferred example, the vertical I-beam 210 is an I20-type I-beam, which has the advantages of strong bearing capacity, good rigidity and stability, strong corrosion resistance, and good economy.

[0033] As a preferred embodiment, Figure 1 , Figure 2 , Figure 4 The first supporting assembly 10 includes a first corrugated steel plate 130 and a second channel steel 140, the second channel steel 140 is overlapped at the tunnel arch foot, and one end of the first corrugated steel plate 130 is overlapped on the second channel steel 140; the first corrugated steel plate 130 is formed with a connecting groove 131 on the wall surface close to the surrounding rock, the bottom surface of the connecting groove 131 is a plane, and the bottom surface of the connecting groove 131 is provided with a first connecting hole 132 for bolts to pass through, the first connecting plate 220 is provided with a second connecting hole (not shown) arranged one-to-one with the first connecting hole 132, and the first connecting plate 220 is connected to the first corrugated steel plate 130 by bolts passing through the first connecting hole 132 and the second connecting hole.

[0034] Specifically, by reserving a connection groove 131 on the first corrugated steel plate 130 and connecting the first connection plate 220 and the first corrugated steel plate 130 by bolts, the oblique force of the first corrugated steel plate 130 can be converted into a vertical force, and on the other hand, it can also limit the lateral direction of the vertical I-beam 210 and the first corrugated steel plate 130. Preferably, the longitudinal length of the first corrugated steel plate 130 is 1m, and the longitudinal spacing of the vertical I-beam 210 is 50cm, that is, there are two vertical I-beams 210 in one first corrugated steel plate 130 segment.

[0035] As a preferred embodiment, it also includes a third connecting plate 310 connected to the end face of the other end of the first corrugated steel plate 130, and a fourth connecting plate 330 connected to the third connecting plate 310, the third connecting plate 310 and the fourth connecting plate 330 are connected and L-shaped, the third connecting plate 310 is provided with a third connecting hole 320 for bolts to pass through, and the fourth connecting plate 330 is provided with a fourth connecting hole 340 for bolts to pass through.

[0036] As a preferred embodiment, Figure 3As shown, the first support assembly 10 also includes a second corrugated steel plate 150, a fifth connecting plate 160, and a sixth connecting plate 170, wherein the second corrugated steel plate 150 is in an arc shape and matches the tunnel steel arch frame, the fifth connecting plate 160 is connected to the end surface of the second corrugated steel plate 150 close to the first corrugated steel plate 130, and the fifth connecting plate 160 is provided with a fifth connecting hole (not shown) arranged one by one with the third connecting hole 320, and the fifth connecting plate 160 is penetrated by bolts The third connecting hole 320 and the fifth connecting hole are connected to the third connecting plate 310; the sixth connecting plate 170 is connected to the fifth connecting plate 160, the fifth connecting plate 160 and the sixth connecting plate 170 are connected and are L-shaped, and the sixth connecting plate 170 is provided with a sixth connecting hole (not shown) arranged one-to-one corresponding to the fourth connecting hole 340, and the fourth connecting plate 330 is connected to the sixth connecting plate 170 by bolts penetrating the fourth connecting hole 340 and the sixth connecting hole.

[0037] Specifically, by bolting the L-shaped structure formed by the third connecting plate 310 and the fourth connecting plate 330 and the L-shaped structure formed by the fifth connecting plate 160 and the sixth connecting plate 170, the shear force of the bolts can be converted into bolt tension, further improving the connection reliability.

[0038] Furthermore, the second corrugated steel plate 150 is provided with grouting holes (not shown). After the landslide body 50 is removed and the second corrugated steel plate 150 is built, the landslide cavity is backfilled with pumped foam concrete through the grouting holes reserved on the second corrugated steel plate 150 to obtain a concrete filling layer 70, thereby filling the collapsed cavity 40 in time.

[0039] Furthermore, if Figure 1 As shown, the second support assembly 20 further includes an oblique brace 240, one end of which is connected to the bottom of the second support assembly 20, and the other end of which is connected to the vertical I-beam 210. By providing the oblique brace 240, the stability of the overall structure can be improved.

[0040] Furthermore, if Figure 5 As shown, the first corrugated steel plate 130 is provided with a seventh connecting plate 133 on both sides along the extension direction of the tunnel, and the seventh connecting plate 133 is provided with a seventh connecting hole 134 for bolts to penetrate. The two adjacent first corrugated steel plates 130 are connected by bolts penetrating the seventh connecting hole 134. By using bolts penetrating the seventh connecting holes 134 on the two adjacent seventh connecting plates 133, the corrugated steel plates can be quickly assembled in the longitudinal direction of the tunnel.

[0041] This application also provides an optimal construction process for reference by those skilled in the art:

[0042] S1, first use corrugated steel plates as temporary support in a certain range of the non-collapsed section, and reinforce the entire section. The two ends of the corrugated steel plates are overlapped at the arch foot of the tunnel to form a pre-support structure to strengthen the non-collapsed section;

[0043] S2, spraying concrete on the surface of the collapsed body 50 and the collapsed cavity 40 in the collapsed section of the tunnel to achieve preliminary protection;

[0044] S3, a first corrugated steel plate 130 is installed under the undamaged steel arch frame 610 of the initial support of the collapsed section for temporary support, one end of the first corrugated steel plate 130 can be overlapped at the tunnel arch foot position through the second channel steel 140, and the other end is overlapped on the top of the I20-type I-beam, the bottom end of the I20-type I-beam is overlapped in the first channel steel 230, the first channel steel 230 is overlapped on the collapsed body 50, and a diagonal brace 240 is added between the I20-type I-beam and the first corrugated steel plate 130 to enhance the overall stability of the temporary support structure;

[0045] S4, excavating the landslide body 50 in sections along the longitudinal direction of the tunnel according to the cycle footage, preferably excavating the landslide body 50 from the outside of the tunnel section first and then from the inside;

[0046] S5, remove the damaged steel arch frame section of the initial support in this section, use a new steel arch frame 620 to extend and connect the undamaged steel arch frame 610, the upper end of the new steel arch frame 620 is connected to the undamaged steel arch frame 610 of the original steel arch frame, and the lower end of the new steel arch frame 620 is overlapped at the tunnel arch foot position; wherein, the fifth connecting plate 160 located at the upper end of the new steel arch frame 620 is bolted to the third connecting plate 310, and the sixth connecting plate 170 is bolted to the fourth connecting plate 330;

[0047] S6, dismantle the I20 I-beam, the first channel steel 230 and the diagonal brace 240 of this section;

[0048] S7, repeating steps S3-S6 until the initial support and the corrugated steel plate temporary support structure in the collapsed section of the tunnel are all completed;

[0049] S8, pump foam concrete backfill into the collapsed cavity of the tunnel through the grouting holes reserved in the second corrugated steel plate 150, remove the first corrugated steel plate, the second corrugated steel plate 150 and other temporary supporting structures, construct the secondary lining structure, and complete the construction of the local collapsed section of the tunnel.

[0050] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A supporting structure for the construction of a local collapse section in a tunnel, characterized in that: It includes a first support assembly for supporting an undamaged steel arch frame and a second support assembly for supporting the first support assembly, wherein the first support assembly is arc-shaped and matches the undamaged steel arch frame, the first support assembly includes a first end and a second end arranged opposite to each other along its own arc length direction, the first end is overlapped at the tunnel arch foot, and the second end extends from the first end toward the collapsed cavity; one end of the second support assembly is overlapped on the collapsed body, and the other end of the second support assembly is supported on the bottom of the second end.

2. The supporting structure for constructing a local collapse section in a tunnel according to claim 1, characterized in that: The second supporting assembly includes a vertical I-beam, a first connecting plate connected to the top of the vertical I-beam, and a first channel steel connected to the bottom of the vertical I-beam. The first channel steel is laid on the landslide body and extends along the extension direction of the tunnel. The first connecting plate is connected to the first supporting assembly.

3. The supporting structure for constructing a local collapse section in a tunnel according to claim 2, characterized in that: The first supporting assembly includes a first corrugated steel plate and a second channel steel, the second channel steel is overlapped at the tunnel arch foot, and one end of the first corrugated steel plate is overlapped on the second channel steel; the first corrugated steel plate is formed with a connecting groove on the wall surface close to the surrounding rock, the bottom surface of the connecting groove is a plane, and the bottom surface of the connecting groove is provided with a first connecting hole for bolts to pass through, the first connecting plate is provided with a second connecting hole arranged one-to-one with the first connecting hole, and the first connecting plate is connected to the first corrugated steel plate by bolts passing through the first connecting hole and the second connecting hole.

4. The supporting structure for constructing a local collapse section in a tunnel according to claim 3, characterized in that: It also includes a third connecting plate connected to the end face of the other end of the first corrugated steel plate and a fourth connecting plate connected to the third connecting plate, the third connecting plate and the fourth connecting plate are connected and L-shaped, the third connecting plate is provided with a third connecting hole for bolts to pass through, and the fourth connecting plate is provided with a fourth connecting hole for bolts to pass through.

5. The supporting structure for constructing a local collapse section in a tunnel according to claim 4, characterized in that: The first supporting assembly also includes a second corrugated steel plate, a fifth connecting plate, and a sixth connecting plate, wherein the second corrugated steel plate is in an arc shape and matches the tunnel steel arch frame, the fifth connecting plate is connected to the end face of the second corrugated steel plate close to the first corrugated steel plate, the fifth connecting plate is provided with a fifth connecting hole arranged one-to-one with the third connecting hole, and the fifth connecting plate is connected to the third connecting plate by bolts penetrating the third connecting hole and the fifth connecting hole; the sixth connecting plate is connected to the fifth connecting plate, the fifth connecting plate and the sixth connecting plate are connected and are L-shaped, the sixth connecting plate is provided with a sixth connecting hole arranged one-to-one with the fourth connecting hole, and the fourth connecting plate is connected to the sixth connecting plate by bolts penetrating the fourth connecting hole and the sixth connecting hole.

6. The supporting structure for constructing a local collapse section in a tunnel according to claim 5, characterized in that: The second corrugated steel plate is provided with grouting holes.

7. The supporting structure for constructing a local collapse section in a tunnel according to claim 2, characterized in that: The vertical I-beam is an I20 type I-beam.

8. The supporting structure for constructing a local collapse section in a tunnel according to claim 2, characterized in that: The second support assembly further includes an oblique brace, one end of which is connected to the bottom of the second support assembly, and the other end of which is connected to the vertical I-beam.

9. The supporting structure for constructing a local collapse section in a tunnel according to claim 3, characterized in that: Seventh connecting plates are provided on both sides of the first corrugated steel plates along the extension direction of the tunnel. Seventh connecting holes for bolts to pass through are opened on the seventh connecting plates. Two adjacent first corrugated steel plates are connected by bolts passing through the seventh connecting holes.

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