Auxiliary supporting system for building flat-top straight-wall tunnel structure

Abstract

The utility model relates to the technical field of rail transit tunnel engineering, in particular to an auxiliary supporting system for building a flat-top straight-wall tunnel structure. The auxiliary supporting system for building the flat-top straight-wall tunnel structure comprises a transverse auxiliary support and a vertical auxiliary support, and further comprises a jet reinforced concrete primary supporting structure and C-shaped reinforced concrete secondary lining structures poured on the two sides of the interior of the jet reinforced concrete primary supporting structure. The transverse auxiliary support pre-embedded fixing steel plate is arranged at the end part of the reinforced concrete secondary lining structure; the transverse auxiliary support is arranged between the reinforced concrete secondary lining structures; the vertical auxiliary support is perpendicular to the transverse auxiliary support, and the two ends of the vertical auxiliary support are connected with the jet reinforced concrete primary support structure. And after the transverse auxiliary support pre-embedded fixing steel plate, the transverse auxiliary support and the vertical auxiliary support are erected, a top plate and a bottom plate of the reinforced concrete secondary lining structure are poured, all the sprayed reinforced concrete primary support structures and the vertical auxiliary supports in the inner range of the tunnel space are dismantled, and the tunnel structure construction step sequence is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transit tunnel engineering, in particular to an auxiliary support system for constructing a flat-top straight-wall tunnel structure. Background Art

[0002] Since the beginning of the 21st century, the urban population has increased rapidly, and the demand for various urban infrastructure has become increasingly strong. While the ground space is being developed, various pipelines, subways, underground construction and other building (structure) facilities are gradually being set up in the underground space, and their distribution density and depth are gradually increasing. This has brought huge environmental challenges to the implementation of new underground tunnel projects, especially when new tunnels pass under existing structures at close range. Due to space limitations, it is impossible to set up an arched roof with better force and deformation control, and a large number of flat-top straight-wall tunnels are used in actual projects.

[0003] During the implementation of the flat-top straight-wall tunnel under traditional support conditions, the deformation control effect on the environment and itself is poor, the lateral and vertical deformation is large, and the construction risk level is high. Especially during the process of primary lining removal and secondary lining construction, the structural force conversion is relatively more complicated, and it is more prone to engineering accidents such as excessive settlement and even roof collapse. This is in sharp contradiction with the high deformation control requirements of existing underground buildings (structures) such as subways, gas, and bridge foundations.

[0004] To this end, it is necessary to study an auxiliary support system that can form a support system in time after the primary lining is removed and the secondary lining is not completely cast and formed, so as to effectively solve the vertical and lateral displacement problems caused by the inability of flat-top straight-wall tunnels to arch during the force transformation process between the primary support and the secondary lining, effectively control the deformation of the tunnel itself and the surrounding environmental elements caused by construction, and reduce implementation risks. Utility Model Content

[0005] The purpose of the utility model is to provide an auxiliary support system for constructing a flat-top straight-wall tunnel structure, in which the lateral auxiliary supports in the auxiliary support system for constructing a flat-top straight-wall tunnel structure can reduce the tunnel deformation caused by the force transformation of the lateral support system, and after the vertical auxiliary supports are erected in place, effective support replacement operations can be performed on the vertical temporary supports, thereby reducing the tunnel deformation caused by the force transformation of the vertical support system.

[0006] The utility model provides an auxiliary support system for constructing a flat-top straight-wall tunnel structure, including a sprayed reinforced concrete primary support structure and a C-shaped reinforced concrete secondary lining structure poured on both sides thereof, and also includes a transverse auxiliary support, a vertical auxiliary support and a transverse auxiliary support pre-buried fixed steel plate;

[0007] The transverse auxiliary support embedded fixed steel plate is arranged at the end of the reinforced concrete secondary lining structure;

[0008] The transverse auxiliary support is arranged between the reinforced concrete secondary lining structure;

[0009] The vertical auxiliary support and the horizontal auxiliary support are arranged perpendicularly, and the upper and lower ends of the vertical auxiliary support are connected to the sprayed reinforced concrete primary support structure;

[0010] After the erection of the embedded fixed steel plates of the transverse auxiliary supports, the transverse auxiliary supports and the vertical auxiliary supports is completed, the remaining top and bottom plates of the reinforced concrete secondary lining structure are poured, and all the sprayed reinforced concrete primary support structures and vertical auxiliary supports within the tunnel space are removed to complete the tunnel structure construction sequence.

[0011] Preferably, the transverse auxiliary support embedded fixed steel plate includes a steel plate and reserved threaded anchor bars, and during construction, the horizontal axis of the steel plate is kept in the same height as the horizontal axis of the top and bottom plate sections of the reinforced concrete secondary lining structure.

[0012] Preferably, it includes a water stop flange, which is installed on the vertical auxiliary support. When installed, its position is kept consistent with the horizontal axis height of the cross section of the top plate and the bottom plate of the reinforced concrete secondary lining structure.

[0013] Preferably, it comprises a vertical support connecting flange, and the vertical support connecting flange is installed in the middle of the vertical auxiliary support.

[0014] Preferably, it also includes a longitudinal steel plate, which is welded to the vertical auxiliary support and is located at both ends of the vertical auxiliary support.

[0015] Beneficial effects:

[0016] The technical solution of the utility model adopts a prefabricated steel structure, which does not require sprayed concrete molding, is easy to operate during construction, and has high timeliness. Once the horizontal auxiliary support is erected in place, it does not need to be dismantled, and a permanent structure is formed with the pouring of the second lining, which can reduce the tunnel deformation caused by the force transformation of the horizontal support system. After the vertical auxiliary support is erected in place, an effective support replacement operation can be performed on the vertical temporary support, reducing the tunnel deformation caused by the force transformation of the vertical support system. The entire auxiliary support system can reduce the overall deformation during the construction process of the flat-top straight-wall tunnel, control the implementation risk, and improve the safety of the project. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a side view of the vertical auxiliary support in the utility model;

[0020] Figure 3 It is a partial enlarged view of the transverse auxiliary support embedded fixed steel plate in the utility model (1);

[0021] Figure 4 It is a partial enlarged view of the transverse auxiliary support embedded fixed steel plate in the utility model (2);

[0022] Figure 5 It is a structural schematic diagram of the vertical support connecting flange in the utility model;

[0023] Figure 6 is a schematic diagram of step S1 in this embodiment;

[0024] Figure 7 is a schematic diagram of step S2 in this embodiment;

[0025] Figure 8 is a schematic diagram of step S3 in this embodiment;

[0026] Fig. 9 is a schematic diagram of step S4 in this embodiment;

[0027] Fig.10 FIG. 4 is a schematic diagram of step S5 in this embodiment.

[0028] Description of reference numerals:

[0029] 1: shotcrete primary support structure; 2: reinforced concrete secondary lining structure; 3: horizontal auxiliary support; 4: vertical auxiliary support; 5: horizontal auxiliary support embedded fixed steel plate; 51: embedded steel plate; 52: threaded anchor bar; 6: water stop flange; 7: vertical support connecting flange; 71: bolt hole; 8: longitudinal steel pad. DETAILED DESCRIPTION

[0030] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are 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.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] like Figures 1 to 5 As shown, the utility model provides an auxiliary support system for constructing a flat-top straight-wall tunnel structure, which includes a shotcrete primary support structure 1 and a C-shaped reinforced concrete secondary lining structure 2 cast on both sides thereof, a transverse auxiliary support 3, a vertical auxiliary support 4, and a transverse auxiliary support embedded fixing steel plate 5. The transverse auxiliary support embedded fixing steel plate 5 is arranged at the end of the reinforced concrete secondary lining structure 2. The transverse auxiliary support 3 is arranged between the reinforced concrete secondary lining structures 2. The vertical auxiliary support 4 is arranged perpendicular to the transverse auxiliary support 3, and the upper and lower ends of the vertical auxiliary support 4 are connected to the shotcrete primary support structure 1.

[0034] After the erection of the transverse auxiliary support embedded fixed steel plate 5, the transverse auxiliary support 3 and the vertical auxiliary support 4 is completed, the remaining top and bottom plates of the reinforced concrete secondary lining structure 2 are cast, and all the sprayed reinforced concrete primary support structures 1 and vertical auxiliary supports 4 within the tunnel space are removed to complete the tunnel structure construction sequence.

[0035] The auxiliary support system for constructing the flat-top straight-wall tunnel structure adopts prefabricated steel structure, does not need to be formed by spraying concrete, is easy to operate during construction, and has high timeliness. Once the horizontal auxiliary support 3 is erected in place, it does not need to be dismantled, and forms a permanent structure with the pouring of the reinforced concrete secondary lining structure 2, which can reduce the tunnel deformation caused by the force transformation of the horizontal support system. After the vertical auxiliary support 4 is erected in place, it can form an effective support replacement operation for the vertical temporary support, reducing the tunnel deformation caused by the force transformation of the vertical support system. The entire auxiliary support system can reduce the overall deformation of the flat-top straight-wall tunnel during the construction process, control the implementation risk, and improve the safety of the project.

[0036] The transverse auxiliary support embedded fixed steel plate 5 includes an embedded steel plate 51 and a reserved threaded anchor bar 52. During construction, the horizontal axis of the steel plate is kept in the same height as the horizontal axis of the top plate and bottom plate section of the reinforced concrete secondary lining structure 2.

[0037] The auxiliary support system for constructing the flat-top straight-wall tunnel structure includes a water stop flange 6, which is installed on the vertical auxiliary support 4. When installed, the position is consistent with the horizontal axis height of the top plate and bottom plate section of the reinforced concrete secondary lining structure 2. Specifically, the vertical auxiliary support 4 is provided with a water stop flange 6 in the middle of the top plate and bottom section of the reinforced concrete secondary lining structure 2 to prevent groundwater from entering the tunnel along the seepage path of the edge of the I-beam 12 double-jointed.

[0038] The auxiliary support system for constructing a flat-top straight-wall tunnel structure includes a vertical support connection flange 7, which is installed in the middle of the vertical auxiliary support 4. Specifically, the vertical support connection flange 7 is pre-processed with 12 bolt holes 71 with a diameter of 2.4 cm and evenly arranged, and is connected by M22 bolts during installation.

[0039] The auxiliary support system for constructing a flat-top straight-wall tunnel structure also includes a longitudinal steel pad 8, which is welded to the vertical auxiliary support 4 and is located at both ends of the vertical auxiliary support 4. Specifically, the longitudinal steel pad 8 has a steel plate width of 35 cm and a thickness of 1 cm, is firmly welded to the vertical auxiliary support 4, and is arranged along the longitudinal length of the tunnel.

[0040] Construction process:

[0041] An auxiliary support system for constructing a flat-top straight-wall tunnel structure includes a horizontal auxiliary support 3 and a vertical auxiliary support 4. The flat-top straight-wall tunnel is excavated in sequence and in steps, and a sprayed reinforced concrete primary support structure 1 is erected in time to form a complete closed-loop initial support system. Subsequently, the C-shaped reinforced concrete secondary lining structure 2 on the left and right sides is cast, and at the same time, a horizontal auxiliary support embedded fixed steel plate 5 is set, and the horizontal auxiliary support 3 is erected. Subsequently, the vertical auxiliary support 4 is erected, and a longitudinal steel pad 8 is set along the longitudinal direction of the tunnel. Then, the vertical auxiliary support 4 is erected in two parts, upper and lower, and firmly connected by a vertical support connection flange 7. A water stop flange 6 is set in the middle of the top plate and the bottom section of the reinforced concrete secondary lining structure 2 to prevent groundwater from entering the tunnel along the seepage path of the edge of the I-beam.

[0042] like Figures 6 to 10 As shown, a construction method of an auxiliary support system for building a flat-top straight-wall tunnel structure in the utility model comprises the following steps:

[0043] S1: Excavate the flat-top straight-wall tunnels in sequence and set up the sprayed reinforced concrete primary support structure 1 in time;

[0044] S2: pouring the C-shaped reinforced concrete secondary lining structure 2 on the left and right sides;

[0045] S3: erecting lateral auxiliary support 3;

[0046] S4: erecting vertical auxiliary support 4;

[0047] S5: Cast the remaining top and bottom plates of the reinforced concrete secondary lining structure 2, remove all sprayed reinforced concrete primary support structures 1 and vertical auxiliary supports 4 within the tunnel space, and complete the tunnel structure construction sequence.

[0048] In S1, the flat-top straight-wall tunnel is excavated in sequence and step by step, and the shotcrete primary support structure 1 is erected in time to form a complete closed-loop primary support system.

[0049] In S2, the overlapping part of the sprayed reinforced concrete primary support structure 1 is chiseled out during the pouring process, and the transverse auxiliary support embedded fixed steel plate 5 is simultaneously set during the pouring process.

[0050] In S3, when erecting the transverse auxiliary support 3, the transverse auxiliary support embedded fixing steel plate 5 is welded and fastened, and the transverse auxiliary support 3 is retained in the reinforced concrete secondary lining structure 2 when it is poured. In this embodiment, the main body of the transverse auxiliary support 3 is made of I-beam 20a and processed according to size.

[0051] In S4, before erecting the vertical auxiliary support 4, a longitudinal steel pad 8 is set along the longitudinal direction of the tunnel, and then the vertical auxiliary support 4 is erected in two parts, upper and lower. In this embodiment, the main body of the vertical auxiliary support 4 is processed according to size by I-12 double-jointed I-beams, and the long side of the cross section of the double-jointed I-beams is parallel to the longitudinal direction of the tunnel when erected. The transverse auxiliary supports 3 and the vertical auxiliary supports 4 are arranged along the longitudinal direction of the tunnel, and the spacing between adjacent transverse auxiliary supports 3 is 2m, the spacing between adjacent vertical auxiliary supports 4 is 2m, and the horizontal spacing between adjacent transverse auxiliary supports 3 and vertical auxiliary supports 4 is 1m. When the vertical auxiliary supports 4 are poured with the reinforced concrete secondary lining structure 2, the overlapping parts are cut and retained therein.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An auxiliary support system for constructing a flat-top straight-wall tunnel structure, comprising a sprayed reinforced concrete primary support structure and a C-shaped reinforced concrete secondary lining structure poured on both sides thereof, characterized in that: It also includes transverse auxiliary supports, vertical auxiliary supports and transverse auxiliary support pre-embedded fixed steel plates; The transverse auxiliary support embedded fixed steel plate is arranged at the end of the reinforced concrete secondary lining structure; The transverse auxiliary support is arranged between the reinforced concrete secondary lining structure; The vertical auxiliary support and the horizontal auxiliary support are arranged perpendicularly, and the upper and lower ends of the vertical auxiliary support are connected to the sprayed reinforced concrete primary support structure; After the erection of the embedded fixed steel plates of the transverse auxiliary supports, the transverse auxiliary supports and the vertical auxiliary supports is completed, the remaining top and bottom plates of the reinforced concrete secondary lining structure are poured, and all the sprayed reinforced concrete primary support structures and vertical auxiliary supports within the tunnel space are removed to complete the tunnel structure construction sequence.

2. The auxiliary support system for constructing a flat-top straight-wall tunnel structure according to claim 1 is characterized in that: The transverse auxiliary support embedded fixed steel plate includes a steel plate and reserved threaded anchor bars. During construction, the horizontal axis of the steel plate is kept consistent with the horizontal axis height of the top and bottom plate sections of the reinforced concrete secondary lining structure.

3. The auxiliary support system for constructing a flat-top straight-wall tunnel structure according to claim 1 is characterized in that: It includes a water stop flange, which is installed on the vertical auxiliary support. When installed, its position is kept consistent with the horizontal axis height of the top and bottom plate sections of the reinforced concrete secondary lining structure.

4. The auxiliary support system for constructing a flat-top straight-wall tunnel structure according to claim 1, characterized in that: It comprises a vertical support connecting flange, and the vertical support connecting flange is installed in the middle of the vertical auxiliary support.

5. The auxiliary support system for constructing a flat-top straight-wall tunnel structure according to claim 1, characterized in that: It also includes a longitudinal steel pad, which is welded to the vertical auxiliary support and is located at both ends of the vertical auxiliary support.

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