A method for replacing arches in a biased double-arch tunnel

Abstract

The present invention provides an arch replacement method for an offset-pressure continuous-arch tunnel, and relates to the technical field of tunnel construction. The arch replacement method for an offset-pressure continuous-arch tunnel comprises the following steps: backfilling from the tunnel face to form a backfill portion, and setting a support member on the top of the backfill portion; reinforcing the slope where the tunnel is located; and removing the support members in sequence from the direction toward the tunnel face and installing an arch frame. By backfilling and counterpressing along the tunnel face to form a backfill portion, and by setting a support member on the top of the backfill portion as a temporary support for the arch top, the initial support in the tunnel can be prevented from continuing to deform, thereby preventing the tunnel from collapsing. Reinforcement of the mountain near the surface of the tunnel can enhance the stability of the slope where the tunnel is located, thereby effectively solving the problem of deformation of the initial support of the tunnel and ensuring safe construction in the tunnel.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to an arch replacement method for a biased multi-arch tunnel. Background Art

[0002] With the development of domestic infrastructure construction over the years, tunnel excavation technology has become quite mature. However, in some areas with complex construction environments and harsh terrain conditions, such as shallow buried tunnels with large bias pressure, steep mountain slopes, developed vertical joints and fissures in the rock strata and the presence of open gaps, traditional tunnel excavation methods are prone to cause wedge-shaped damage to the rock strata in the process of arch replacement, thus causing tunnel intrusion and even tunnel collapse. Summary of the invention

[0003] The invention provides an arch replacement method for a biased multi-arch tunnel, which can prevent the collapse of the tunnel arch top and ensure the construction safety in the tunnel.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] In a first aspect, the present invention provides a method for replacing an arch in a biased multi-arch tunnel, comprising the following steps:

[0006] Backfilling is performed from the tunnel face in the tunnel to form a backfill portion, and a support member is arranged on the top of the backfill portion;

[0007] Reinforce the slope where the tunnel is located;

[0008] The support members are removed in sequence from the direction toward the tunnel face and the arch frames are installed.

[0009] In an optional implementation manner, the step of reinforcing the slope where the tunnel is located includes:

[0010] A first stress member is disposed transversely on the mountain body vertically above the tunnel.

[0011] In an optional embodiment, the step of horizontally arranging a first stress member on the mountain body vertically above the tunnel further comprises:

[0012] A plurality of the first stress members are arranged so as to be spaced apart from each other, and a longitudinal spacing and a transverse spacing of the plurality of first stress members are both a first preset distance.

[0013] In an optional implementation manner, the step of reinforcing the slope where the tunnel is located includes:

[0014] A second stress member is vertically arranged in the mountain body in the horizontal direction corresponding to the tunnel and close to the slope.

[0015] In an optional embodiment, the step of vertically arranging a second stress member in the mountain body in the horizontal direction corresponding to the tunnel and close to the slope further comprises:

[0016] A plurality of the second stress members are arranged so as to be spaced apart from each other, and a lateral spacing distance between the plurality of second stress members is a second preset distance.

[0017] In an optional embodiment, the step of backfilling from the tunnel face in the tunnel to form a backfill portion, and providing a support member on the top of the backfill portion further comprises:

[0018] An inverted arch is arranged on the top of the backfill portion, and a support frame is arranged between the inverted arch and the top inner wall of the tunnel to form the support member.

[0019] In an optional embodiment, the step of removing the support members in sequence from the direction toward the tunnel face and installing the arch frame further includes:

[0020] The support frame and the invert are removed in sequence from the direction toward the tunnel face.

[0021] In an optional embodiment, the step of removing the support members in sequence from the direction toward the tunnel face and installing the arch frame further includes:

[0022] removing supports provided on the inner wall of the tunnel;

[0023] The tunnel is expanded so that the inner wall profile of the tunnel is consistent with a preset profile.

[0024] In an optional embodiment, the step of removing the support members in sequence from the direction toward the tunnel face and installing the arch frame further includes:

[0025] cleaning the inner wall of the tunnel to make the inner wall surface of the tunnel smooth;

[0026] Install and secure the arch.

[0027] In an optional embodiment, after the step of sequentially removing the support members from the direction toward the tunnel face and installing the arch, the step further includes:

[0028] The tunnel is relined.

[0029] The beneficial effects of the arch replacement method of the biased multi-arch tunnel provided by the embodiment of the present invention include: by backfilling and counter-pressing along the face to form a backfill part, by setting a support member on the top of the backfill part as a temporary support for the arch, the initial support in the tunnel can be prevented from continuing to deform, thereby preventing the tunnel from collapsing. Reinforcement treatment is performed on the mountain near the surface of the tunnel to enhance the stability of the slope where the tunnel is located, thereby effectively solving the problem of deformation of the initial support of the tunnel and ensuring safe construction in the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A flow chart of an arch replacement method for a biased multi-arch tunnel provided in an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of the backfill portion and the support structure provided in an embodiment of the present invention;

[0033] Figure 3 A schematic diagram of a first stress member provided in an embodiment of the present invention;

[0034] Figure 4 A schematic diagram of a second stress member provided in an embodiment of the present invention.

[0035] Icons: 100-backfill; 200-support member; 210-inverted arch; 220-support frame; 300-limited arch frame; 400-first stress member; 500-second stress member; 600-tunnel. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0041] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0042] The invention provides an arch replacement method for a biased multi-arch tunnel, which is applied to a shallow-buried biased tunnel.

[0043] See also Figures 1 to 4 The arch replacement method of the biased double-arch tunnel includes the following steps:

[0044] Step S100, backfilling from the tunnel face in the tunnel to form a backfill portion, and setting a support member on the top of the backfill portion;

[0045] Step S200, reinforcing the slope where the tunnel is located;

[0046] Step S300, removing the supporting members in sequence from the direction toward the tunnel face and installing the arch frame.

[0047] In this embodiment, the deformation of the tunnel is large due to the initial support. In order to prevent it from further deformation, backfill is performed along the face to form a backfill portion 100. A support member 200 is provided on the top of the backfill portion 100 as a temporary support for the vault, thereby preventing the tunnel 600 from collapsing.

[0048] In this embodiment, since the tunnel 600 is set in a shallowly buried and biased mountain, the mountain close to the surface of the tunnel 600 is reinforced to enhance the stability of the slope where the tunnel 600 is located, thereby effectively solving the problem of initial deformation of the tunnel 600 and ensuring safe construction in the tunnel 600.

[0049] Further, step S100 includes a sub-step S110 of providing an invert arch on the top of the backfill portion, and providing a support frame between the invert arch and the top inner wall of the tunnel to form a support member.

[0050] In this embodiment, if Figure 2 As shown, the lower tunnel area corresponding to the tunnel face is temporarily backfilled with tunnel slag to form a backfill portion 100, and a temporary invert 210 is set on the top of the backfill portion 100. A support frame 220 is set on the temporary invert 210 for temporary support to prevent the initial support in the tunnel from continuing to deform.

[0051] Specifically, the support frame 220 can be supported by truss-type I-beams to prevent the arch of the tunnel 600 from collapsing, thereby ensuring the safety of construction in the tunnel.

[0052] Furthermore, step S200 includes sub-step S210 and sub-step S220.

[0053] Step S210: a first stress member is horizontally arranged on the mountain body vertically above the tunnel.

[0054] Step S220: vertically set a second stress member in the horizontal direction corresponding to the tunnel and close to the mountain on the slope.

[0055] In this embodiment, if Figure 3 and Figure 4 As shown, since the main reason for the tunnel 600 support arch intrusion is that the surface of the tunnel 600 has the characteristics of shallow burial and bias pressure, reinforcing the surface of the slope where the tunnel 600 is located can effectively solve the problem of tunnel 600 support intrusion.

[0056] It should be noted that sub-step S210 and sub-step S220 are parallel embodiments, which can be performed simultaneously or sequentially.

[0057] Further, step S210 includes sub-step S211, providing a plurality of first stress members and making the plurality of first stress members spaced apart, and the longitudinal spacing and the transverse spacing of the plurality of first stress members are both a first preset distance.

[0058] In this embodiment, a plurality of first stress members 400 are horizontally arranged on the mountain directly above the tunnel 600, that is, anchor reinforcement measures are taken for the slope where the tunnel 600 is located. In other words, a plurality of rows of first stress members 400 are arranged on the center line of the two tunnels 600 and biased toward one side of the slope to enhance the stability of the slope where the tunnel 600 is located and reduce the adverse effects of the shallow buried biased slope.

[0059] It should be noted that the first stress member 400 may be disposed in a transverse direction or may be slightly inclined.

[0060] Specifically, the first stress member 400 may be a long prestressed anchor cable, and a plurality of first stress members 400 are arranged in three rows. The length of the first stress member 400 is 25m to 30m, and the first preset distance may be 3m.

[0061] Further, step S220 includes sub-step S221, providing a plurality of second stress members and making the plurality of second stress members spaced apart, and the lateral spacing distance of the plurality of second stress members being a second preset distance.

[0062] In this embodiment, the second stress member 500 is vertically arranged in the horizontal direction corresponding to the tunnel 600 and close to the mountain body of the slope.

[0063] Specifically, the first stress member 400 may be a long prestressed anchor cable, and the plurality of second stress members 500 are arranged in two rows. The length of the second stress member 500 is 25m to 30m, the second preset distance may be 1m, and the vertical lengths of the two rows of second stress members 500 differ by 0.8m.

[0064] Furthermore, step S300 also includes sub-step S310, sub-step S320, sub-step S330 and sub-step S340.

[0065] It should be noted that, in actual applications, sub-step S310 , sub-step S320 , sub-step S330 , and sub-step S340 are usually implemented in sequence.

[0066] Among them, sub-step S310 is to remove the support frame and the invert arch in sequence from the direction toward the tunnel face.

[0067] In this embodiment, the temporarily installed support member 200 and the temporary supporting arch 210 thereunder are removed.

[0068] Sub-step S320, removing the support provided on the inner wall of the tunnel, and expanding the tunnel to make the inner wall profile of the tunnel consistent with the preset profile.

[0069] In this embodiment, a drill rod is used in conjunction with a manual jackhammer to break the initial support of the limiting part, cut off the connecting reinforcement, and then cut off and remove the limiting arch frame 300 at the connection; after the tunnel 600 is expanded to make the internal contour of the tunnel 600 consistent with the preset contour, concrete is sprayed on the rock surface of the tunnel 600.

[0070] Sub-step S330, cleaning the inner wall of the tunnel to make the inner wall surface of the tunnel flat; installing and fixing the arch frame.

[0071] In this embodiment, the connecting steel plates that have not invaded the primary support are cleaned to make the surface of the inner wall of the tunnel 600 smooth. The arch frames at the arch top and the arch waist of the tunnel 600 are firmly connected by bolts and then welded, and the arch frames are placed on the backfilling work platform and fixed by bolts. After the arch frame is installed, two 4.5m long Φ42 locking foot small guide tubes are set at the arch feet on each side of the arch frame. After the arch replacement is completed, concrete is sprayed in time to restore the original state of the primary support.

[0072] Sub-step S340, performing secondary lining of the tunnel.

[0073] In this embodiment, after the primary support arch replacement is completed, the secondary lining construction can be carried out in time according to the arch replacement progress in the tunnel, thereby shortening the distance between the secondary lining structure and the tunnel face and closing the secondary lining structure into a ring as soon as possible. The secondary lining structure can provide certain support for the tunnel 600, thereby increasing the support strength in the tunnel.

[0074] In summary, the embodiment of the present invention provides a method for replacing an arch in a biased multi-arch tunnel 600, by backfilling and counter-pressing along the face to form a backfill portion 100, and by setting a support member 200 on the top of the backfill portion 100 as a temporary support for the arch, the initial support in the tunnel 600 can be prevented from continuing to deform, thereby preventing the collapse of the tunnel 600. Reinforcement treatment is performed on the mountain near the surface of the tunnel 600 to enhance the stability of the slope where the tunnel 600 is located, thereby effectively solving the problem of deformation of the initial support of the tunnel 600 and ensuring safe construction in the tunnel 600.

[0075] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for replacing an arch in a biased double-arch tunnel, characterized in that: The following steps are involved: Backfilling is performed from the tunnel face in the tunnel to form a backfill portion, and a support member is arranged on the top of the backfill portion; Reinforce the slope where the tunnel is located; Remove the supporting members in sequence from the direction toward the tunnel face and install the arch frame; The step of reinforcing the slope where the tunnel is located comprises: A first stress member is disposed laterally on the mountain body vertically above the tunnel; The step of horizontally arranging a first stress member on the mountain body vertically above the tunnel also includes: Arrange a plurality of the first stress members and arrange the plurality of the first stress members at intervals, and the longitudinal spacing and the transverse spacing of the plurality of the first stress members are both a first preset distance; The step of reinforcing the slope where the tunnel is located comprises: A second stress member is vertically arranged in the mountain body in the horizontal direction corresponding to the tunnel and close to the slope; The step of vertically arranging a second stress member in the horizontal direction corresponding to the tunnel and close to the slope of the mountain also includes: Arrange a plurality of the second stress members and arrange the plurality of the second stress members at intervals, and the lateral spacing distance of the plurality of the second stress members is a second preset distance; The step of backfilling from the tunnel face in the tunnel to form a backfill portion, and providing a support member on the top of the backfill portion also includes: An inverted arch is arranged at the top of the backfill portion, and a support frame is arranged between the inverted arch and the top inner wall of the tunnel to form the support member; The step of removing the support members in sequence from the direction toward the tunnel face and installing the arch frame also includes: The support frame and the invert are removed in sequence from the direction toward the tunnel face.

2. The arch replacement method of the biased multi-arch tunnel according to claim 1 is characterized in that: The step of removing the support members in sequence from the direction toward the tunnel face and installing the arch frame also includes: removing supports provided on the inner wall of the tunnel; The tunnel is expanded so that the inner wall profile of the tunnel is consistent with a preset profile.

3. The arch replacement method of the biased multi-arch tunnel according to claim 1 is characterized in that: The step of removing the support members in sequence from the direction toward the tunnel face and installing the arch frame also includes: cleaning the inner wall of the tunnel to make the inner wall surface of the tunnel smooth; Install and secure the arch.

4. The arch replacement method of the biased multi-arch tunnel according to claim 1 is characterized in that: After the step of removing the support members in sequence from the direction toward the tunnel face and installing the arch frame, the step further includes: The tunnel is relined.

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