A collapse prevention support system and method for tunnel construction

Abstract

This invention belongs to the field of tunnel construction technology, specifically relating to an anti-collapse support system and method for tunnel construction. The anti-collapse support system includes an outer support ring, an inner support ring, and outer supports. The outer support ring is composed of several arc-shaped support boxes arranged in a circular array, with two first arc-shaped limiting plates symmetrically fixed to the inner surface of each arc-shaped support box. The inner support ring is composed of several arc-shaped support plates arranged in a circular array, with two second arc-shaped limiting plates symmetrically fixed to the outer surface of each arc-shaped support plate. Connecting end plates are provided near both ends on the inner surface. The outer supports are symmetrically arranged on both sides of the lower part of the outer support ring to provide auxiliary support. This invention achieves rapid assembly of the outer support ring through the inner support ring, and the outer supports facilitate rapid dispersion of the force on the top of the outer support ring, thereby improving its support effect. An annular airbag belt can be added between the outer and inner support rings to further enhance its support capacity.

Description

Technical Field

[0001] This invention belongs to the field of tunnel construction technology, specifically relating to a collapse prevention support system and method for tunnel construction. Background Technology

[0002] Tunnel construction can be mainly divided into two methods: the manual mining method and the mechanical shield tunneling method. Currently, urban subway sections are mainly constructed using the shield tunneling method, while most other tunnels still rely on the manual mining method. With tunnel construction facing complex geological conditions, surface environments, and increasing labor costs, the mechanization level of mining construction urgently needs improvement. Mining construction is particularly difficult in conditions of weak surrounding rock. To ensure construction safety and effectively control surrounding rock deformation, weak surrounding rock requires advanced reinforcement or support methods such as grouting, pipe roofs, pipe curtains, and horizontal jet grouting. These advanced reinforcement or support measures, as temporary support measures, cannot be included in the stress calculation as part of the lining structure. Pipe roofs used for advanced support cannot be reused, and equipment needs to be repeatedly removed and installed to facilitate the smooth alternation between advanced support and tunnel excavation. This not only increases project costs but also significantly extends the construction period.

[0003] To this end, patent specification CN104847393B discloses a mobile support structure for tunnels and a tunnel construction method under its protection. The mobile support structure is composed of multiple interlocking boxes that conform to the outer contour of the tunnel, with a rearward-extending shield at the rear of each box. Under the protection of the mobile support structure consisting of the interlocking boxes and their rear shields, tunnel excavation and lining can be carried out safely and quickly.

[0004] However, this type of mobile tunnel support structure still has shortcomings. Its support structure design is not reasonable enough, the bearing pressure cannot be effectively distributed, and the anti-collapse effect is not ideal. Therefore, it needs to be optimized and improved. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned problems existing in the conventional technology and to provide a collapse prevention support system and method for tunnel construction.

[0006] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution:

[0007] This invention provides a collapse prevention support system for tunnel construction, the collapse prevention support system comprising:

[0008] The outer support ring is composed of several arc-shaped support boxes arranged in a circular array. Two first arc-shaped limiting plates are symmetrically fixed on the inner side of the arc-shaped support boxes.

[0009] The inner support ring is composed of several arc-shaped support plates arranged in a ring array. Two second arc-shaped limiting plates are symmetrically fixed on the outer surface of the arc-shaped support plates. The outer surface of the second arc-shaped limiting plate abuts against the inner surface of the corresponding first arc-shaped limiting plate. A connecting end plate is provided on the inner surface of the second arc-shaped limiting plate near both ends. Two adjacent first arc-shaped limiting plates are fixedly connected by a first bolt that passes through the connecting end plate.

[0010] There are two external supports, which are symmetrically arranged on both sides of the lower part of the outer support ring. The external supports are fixed to the foundation by anchor rods and are used to provide auxiliary support for the outer support ring.

[0011] Furthermore, in the aforementioned anti-collapse support system for tunnel construction, the inner side shape of the first arc-shaped limiting plate matches the outer side shape of the arc-shaped support plate, and the outer side shape of the second arc-shaped limiting plate matches the inner side shape of the arc-shaped support box.

[0012] Furthermore, in the aforementioned anti-collapse support system for tunnel construction, the arc-shaped support plate, the second arc-shaped limiting plate, and the connecting end plate are an integral structure, and the connecting end plate has an internal through hole that mates with the first bolt.

[0013] Furthermore, in the aforementioned anti-collapse support system for tunnel construction, the two first arc-shaped limiting plates in the arc-shaped support box and the two second arc-shaped limiting plates in the corresponding arc-shaped support plate are fixedly connected by second bolts. The first arc-shaped limiting plate is provided with a first external through hole that mates with the second bolt, and the second arc-shaped limiting plate is provided with a second external through hole that mates with the second bolt.

[0014] Furthermore, in the aforementioned anti-collapse support system for tunnel construction, the outer support is composed of a horizontal plate and a first vertical plate and a second vertical plate at both ends. The horizontal plate has anchor holes that cooperate with anchor rods. The upper end of the first vertical plate has a first support surface, and the upper end of the second vertical plate has a second support surface.

[0015] Furthermore, in the aforementioned anti-collapse support system for tunnel construction, the distance between the first vertical plate portion of the two outer supports is equal to the inner diameter of the outer support ring, and the distance between the second vertical plate portion of the two outer supports is equal to the inner radius of the inner support ring.

[0016] Furthermore, in the aforementioned anti-collapse support system for tunnel construction, the first support surface and the second support surface are arc-shaped surfaces that cooperate with the outer support ring, and the two sides of the arc-shaped surface are provided with stops to prevent axial displacement of the outer support ring.

[0017] Furthermore, in the aforementioned anti-collapse support system for tunnel construction, the anti-collapse support system also includes an annular airbag belt with an inflation head, and the area between two second arc-shaped limiting plates on the outer side of the arc-shaped support plate serves as the airbag belt installation area.

[0018] Furthermore, in the aforementioned anti-collapse support system for tunnel construction, the inflation head is located inside the annular airbag belt, and one of the arc-shaped support plates has an outlet hole for easily introducing the inflation head into the inner cavity area of ​​the inner support ring.

[0019] This invention also provides a method for preventing collapse during tunnel construction. This method is based on the aforementioned anti-collapse support system and specifically includes the following steps:

[0020] 1) Fix the positions of the two external supports in the area to be supported according to the design values;

[0021] 2) Install the arc-shaped support box on the outside of the arc-shaped support plate;

[0022] 3) Fix adjacent arc-shaped support plates in sequence to splice them to form an inner support ring. At this time, the arc-shaped support box is also connected to form an outer support ring. The outer support ring, inner support ring and outer support together constitute the anti-collapse support system.

[0023] The beneficial effects of this invention are:

[0024] The present invention has a reasonable structural design, which is mainly composed of an outer support ring, an inner support ring and an outer support. The inner support ring enables the rapid assembly of the outer support ring, and the outer support facilitates the rapid distribution of the force on the top of the outer support ring, thereby improving its support effect. An annular airbag belt can be added between the outer support ring and the inner support ring to further improve its support capacity.

[0025] Of course, any product implementing this invention does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram illustrating the usage state of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the present invention;

[0029] Figure 3This is a schematic diagram of the arc-shaped support box in this invention;

[0030] Figure 4 This is a schematic diagram of the arc-shaped support plate in this invention;

[0031] Figure 5 This is an assembly diagram of the arc-shaped support box and arc-shaped support plate of the present invention;

[0032] Figure 6 This is a schematic diagram of the structure of the external support in this invention;

[0033] Figure 7 This is a schematic diagram of the annular airbag belt in this invention;

[0034] In the attached diagram, the component numbers are as follows:

[0035] 1-Outer support ring, 101-Arc-shaped support box, 102-First arc-shaped limiting plate, 2-Inner support ring, 201-Arc-shaped support plate, 202-Second arc-shaped limiting plate, 203-Connecting end plate, 3-Outer support, 301-Horizontal plate part, 302-First vertical plate part, 303-First support surface, 304-Second vertical plate part, 305-Second support surface, 4-Anchor rod, 5-First bolt, 6-Second bolt, 7-Annular airbag belt, 8-Inflation head. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] Please see Figures 1-6 As shown, this embodiment is an anti-collapse support system for tunnel construction. The anti-collapse support system includes an outer support ring 1, an inner support ring 2, and outer supports 3. The inner support ring 2 is located inside the outer support ring 1. Two outer supports 3 are provided, symmetrically arranged on both sides of the lower part of the outer support ring 1. The outer supports 3 are fixed to the foundation by anchor rods, providing auxiliary support for the outer support ring 3.

[0039] In this embodiment, the outer support ring 1 is formed by splicing together a number of arc-shaped support boxes 101 in a circular array, and two first arc-shaped limiting plates 102 are symmetrically fixed on the inner side of the arc-shaped support box 101.

[0040] In this embodiment, the inner support ring 2 is formed by splicing together several arc-shaped support plates 201 in a circular array. Two second arc-shaped limiting plates 202 are symmetrically fixed on the outer surface of the arc-shaped support plates 201. The outer surface of the second arc-shaped limiting plate 202 abuts against the inner surface of the corresponding first arc-shaped limiting plate 102. A connecting end plate 203 is provided on the inner surface of the second arc-shaped limiting plate 202 near both ends. Two adjacent first arc-shaped limiting plates 102 are fixedly connected by a first bolt 5 that passes through the connecting end plate 203. The arc-shaped support plate 201, the second arc-shaped limiting plate 202, and the connecting end plate 203 are integral structures. The connecting end plate 203 has an inner through hole that mates with the first bolt 5.

[0041] In this embodiment, the inner surface shape of the first arc-shaped limiting plate 102 matches the outer surface shape of the arc-shaped support plate 201, and the outer surface shape of the second arc-shaped limiting plate 202 matches the inner surface shape of the arc-shaped support box 101. The widths of the first arc-shaped limiting plate 102 and the second arc-shaped limiting plate 202 are equal.

[0042] In this embodiment, the two first arc-shaped limiting plates 102 in the arc-shaped support box 101 and the two second arc-shaped limiting plates 202 in the corresponding arc-shaped support plate 201 are fixedly connected by the second bolt 6. The first arc-shaped limiting plate 102 is provided with a first external through hole that cooperates with the second bolt 6, and the second arc-shaped limiting plate 202 is provided with a second external through hole that cooperates with the second bolt 6.

[0043] In this embodiment, the outer support 3 is composed of a horizontal plate portion 301 and a first vertical plate portion 302 and a second vertical plate portion 304 located at both ends of the horizontal plate portion 301. The horizontal plate portion 301 has anchoring holes that cooperate with the anchoring rod 4. The upper end of the first vertical plate portion 302 has a first support surface 303, and the upper end of the second vertical plate portion 304 has a second support surface 305. The distance between the first vertical plate portions 302 of the two outer supports 3 is equal to the inner cavity diameter of the outer support ring 1, and the distance between the second vertical plate portions 304 of the two outer supports 3 is equal to the inner cavity radius of the inner support ring 2. The first support surface 303 and the second support surface 305 are arc-shaped surfaces that cooperate with the outer support ring, and the two sides of the arc-shaped surfaces are provided with stops to prevent axial displacement of the outer support ring 1.

[0044] This embodiment also provides a method for preventing collapse during tunnel construction, which specifically includes the following steps:

[0045] 1) Based on the design values, fix the two external supports 3 at their positions in the area to be supported;

[0046] 2) Install the arc-shaped support box 101 on the outside of the arc-shaped support plate 201;

[0047] 3) Fix the adjacent arc-shaped support plates 201 in sequence so that they are spliced ​​together to form the inner support ring 2. At this time, the arc-shaped support box 101 is also connected to form the outer support ring 1. The outer support ring 1, the inner support ring 2 and the outer support 3 together constitute the anti-collapse support system.

[0048] Example 2

[0049] Please see Figures 1-7 As shown, this embodiment is an anti-collapse support system for tunnel construction. The anti-collapse support system includes an outer support ring 1, an inner support ring 2, outer supports 3, and an annular airbag belt 7 with an inflation head 8. The inner support ring 2 is located inside the outer support ring 1, and the annular airbag belt 7 is located between the outer support ring 1 and the inner support ring 2. Two outer supports 3 are provided, symmetrically arranged on both sides of the lower part of the outer support ring 1. The outer supports 3 are fixed to the foundation by anchor rods, providing auxiliary support for the outer support ring 3.

[0050] In this embodiment, the outer support ring 1 is formed by splicing together a number of arc-shaped support boxes 101 in a circular array, and two first arc-shaped limiting plates 102 are symmetrically fixed on the inner side of the arc-shaped support box 101.

[0051] In this embodiment, the inner support ring 2 is formed by splicing together several arc-shaped support plates 201 in a circular array. Two second arc-shaped limiting plates 202 are symmetrically fixed on the outer surface of the arc-shaped support plates 201. The outer surface of the second arc-shaped limiting plate 202 abuts against the inner surface of the corresponding first arc-shaped limiting plate 102. A connecting end plate 203 is provided on the inner surface of the second arc-shaped limiting plate 202 near both ends. Two adjacent first arc-shaped limiting plates 102 are fixedly connected by a first bolt 5 that passes through the connecting end plate 203. The arc-shaped support plate 201, the second arc-shaped limiting plate 202, and the connecting end plate 203 are integral structures. The connecting end plate 203 has an inner through hole that mates with the first bolt 5.

[0052] In this embodiment, the inner surface shape of the first arc-shaped limiting plate 102 matches the outer surface shape of the arc-shaped support plate 201, and the outer surface shape of the second arc-shaped limiting plate 202 matches the inner surface shape of the arc-shaped support box 101. The widths of the first arc-shaped limiting plate 102 and the second arc-shaped limiting plate 202 are equal.

[0053] In this embodiment, the outer support 3 is composed of a horizontal plate portion 301 and a first vertical plate portion 302 and a second vertical plate portion 304 located at both ends of the horizontal plate portion 301. The horizontal plate portion 301 has anchoring holes that cooperate with the anchoring rod 4. The upper end of the first vertical plate portion 302 has a first support surface 303, and the upper end of the second vertical plate portion 304 has a second support surface 305. The distance between the first vertical plate portions 302 of the two outer supports 3 is equal to the inner cavity diameter of the outer support ring 1, and the distance between the second vertical plate portions 304 of the two outer supports 3 is equal to the inner cavity radius of the inner support ring 2. The first support surface 303 and the second support surface 305 are arc-shaped surfaces that cooperate with the outer support ring, and the two sides of the arc-shaped surfaces are provided with stops to prevent axial displacement of the outer support ring 1.

[0054] In this embodiment, the area between the two second arc-shaped limiting plates 202 on the outer surface of the arc-shaped support plate 201 serves as the airbag belt installation area. The inflation head 8 is located inside the annular airbag belt 7, and one of the arc-shaped support plates 201 has an outlet hole for easily introducing the inflation head 8 into the inner cavity area of ​​the inner support ring 2.

[0055] This embodiment also provides a method for preventing collapse during tunnel construction, which specifically includes the following steps:

[0056] 1) Based on the design values, fix the two external supports 3 at their positions in the area to be supported;

[0057] 2) The annular airbag belt 7 is fitted onto the outside of the arc-shaped support box 101, and the inflation head 8 on it is led out from the lead-out hole of the corresponding arc-shaped support plate 201.

[0058] 2) Install the arc-shaped support box 101 on the outside of the arc-shaped support plate 201 and the annular airbag belt 7;

[0059] 3) Fix adjacent arc-shaped support plates 201 in sequence to form an inner support ring 2. At this time, the arc-shaped support box 101 is also connected to form an outer support ring 1. The annular airbag belt 7 is inflated until its pressure value reaches the set value and then maintained. The outer support ring 1, inner support ring 2, outer support 3 and annular airbag belt 7 together constitute the anti-collapse support system.

[0060] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A collapse-prevention support system for tunnel construction, characterized in that, The anti-collapse support system includes an outer support ring, an inner support ring, an outer support, and an annular airbag belt with an inflation head; The outer support ring is composed of several arc-shaped support boxes arranged in a ring array, and two first arc-shaped limiting plates are symmetrically fixed on the inner side of the arc-shaped support box. The inner support ring is composed of several arc-shaped support plates arranged in a ring array. Two second arc-shaped limiting plates are symmetrically fixed on the outer surface of the arc-shaped support plates. The outer surface of the second arc-shaped limiting plate abuts against the inner surface of the corresponding first arc-shaped limiting plate. A connecting end plate is provided on the inner surface of the second arc-shaped limiting plate near both ends. Two adjacent first arc-shaped limiting plates are fixedly connected by a first bolt that passes through the connecting end plate. There are two external supports, which are symmetrically arranged on both sides of the lower part of the outer support ring. The external supports are fixed to the foundation by anchor rods and are used to provide auxiliary support for the outer support ring. The area between the two second arc-shaped limiting plates on the outer side of the arc-shaped support plate serves as the airbag belt installation area; the inflation head is located on the inner side of the annular airbag belt, and one of the arc-shaped support plates has an outlet hole for easy introduction of the inflation head into the inner cavity area of ​​the inner support ring.

2. The anti-collapse support system for tunnel construction according to claim 1, characterized in that: The inner side shape of the first arc-shaped limiting plate matches the outer side shape of the arc-shaped support plate, and the outer side shape of the second arc-shaped limiting plate matches the inner side shape of the arc-shaped support box.

3. The anti-collapse support system for tunnel construction according to claim 1, characterized in that: The arc-shaped support plate, the second arc-shaped limiting plate and the connecting end plate on it are an integral structure, and the connecting end plate has an internal through hole that mates with the first bolt.

4. The anti-collapse support system for tunnel construction according to claim 1, characterized in that: The two first arc-shaped limiting plates in the arc-shaped support box and the two second arc-shaped limiting plates in the corresponding arc-shaped support plate are fixedly connected by the second bolt. The first arc-shaped limiting plate has a first external through hole that cooperates with the second bolt, and the second arc-shaped limiting plate has a second external through hole that cooperates with the second bolt.

5. The anti-collapse support system for tunnel construction according to claim 1, characterized in that: The outer support is composed of a horizontal plate and a first vertical plate and a second vertical plate at both ends. The horizontal plate has an anchoring hole that cooperates with the anchor rod. The upper end of the first vertical plate has a first support surface, and the upper end of the second vertical plate has a second support surface.

6. The anti-collapse support system for tunnel construction according to claim 5, characterized in that: The distance between the first vertical plate portions of the two outer supports is equal to the inner diameter of the outer support ring, and the distance between the second vertical plate portions of the two outer supports is equal to the inner radius of the inner support ring.

7. The anti-collapse support system for tunnel construction according to claim 6, characterized in that: The first support surface and the second support surface are arc-shaped surfaces that cooperate with the outer support ring, and the two sides of the arc-shaped surface are provided with stops to prevent the axial displacement of the outer support ring.

8. A method for preventing collapse during tunnel construction, the method being implemented based on the anti-collapse support system for tunnel construction as described in claim 7, characterized in that, Specifically, the steps include the following: 1) Fix the positions of the two external supports in the area to be supported according to the design values; 2) Install the arc-shaped support box on the outside of the arc-shaped support plate; 3) Fix adjacent arc-shaped support plates in sequence to splice them together to form an inner support ring. At this time, the arc-shaped support box is also connected to form an outer support ring. The outer support ring, inner support ring and outer support together constitute the anti-collapse support system.

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