Middle partition wall supporting steel frame and large-section tunnel supporting steel frame

Abstract

The utility model relates to the technical field of tunnel engineering, in particular to a middle partition wall supporting steel frame and a large-section tunnel supporting steel frame. The middle partition wall supporting steel frame comprises a bottom support, a top support and a main frame body. The bottom support is used for being connected with a rock wall of a tunnel, the top support is used for being connected with a main arch ring of the tunnel, and the bottom support and the top support are connected to the two opposite ends of the main frame body. The main frame body bends and extends in the thickness direction of the main frame body. According to the middle partition wall supporting steel frame, by adjusting the structural form of the middle partition wall steel frame, an in-plane linear steel frame is changed into an out-of-plane bent steel frame, the rigidity of the middle partition wall middle steel frame is reduced on the premise of providing certain support for a main arch ring, and therefore the internal force borne by the middle partition wall steel frame is reduced, and the service life of the middle partition wall steel frame is prolonged. And meanwhile, the middle partition wall steel frame is convenient to dismantle, so that the bearing capacity of the primary support can be fully exerted, and a sufficient working face is provided to guarantee symmetrical construction of the pilot tunnel.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel engineering, in particular to a middle partition wall supporting steel frame and a large-section tunnel supporting steel frame. Background Art

[0002] In the construction of large-section highway tunnels, partial excavation is required due to the large span of the tunnel. When the partial pilot tunnel excavation is too large, the commonly used pure linear temporary intermediate partition steel frame support is too large, but it bears too much internal force, is easily damaged, and is not easy to dismantle, and cannot give full play to the bearing capacity of the initial support.

[0003] If the middle partition wall steel frame is bent inwardly, although the stiffness of the middle partition wall steel frame can be reduced and, under the premise of providing certain support to the main arch ring, excessive internal force will not be generated inside the middle partition wall, thus facilitating subsequent demolition, the bent steel frame in the plane reduces the working surface of the pilot tunnel construction and reduces construction efficiency. Utility Model Content

[0004] The purpose of the present utility model includes providing a middle partition wall support steel frame and a large-section tunnel support steel frame, which changes the in-plane straight steel frame into an out-of-plane curved steel frame by adjusting the structural form of the middle partition wall steel frame itself. On the premise of providing certain support to the main arch ring, the rigidity of the middle partition wall steel frame is reduced, thereby reducing the internal force borne by the middle partition wall steel frame itself, and at the same time making the middle partition wall steel frame easy to dismantle. Therefore, by appropriately reducing the rigidity of the temporary middle partition wall steel frame support, the internal force distribution of the middle partition wall and the main arch ring can be adjusted, the bearing capacity of the initial support can be fully exerted, and sufficient working surface can be provided to ensure the symmetrical construction of the pilot tunnel.

[0005] The embodiment of the present utility model can be implemented as follows:

[0006] In a first aspect, the utility model provides a middle partition wall support steel frame, which includes a bottom support, a top support and a main frame;

[0007] The bottom bracket is used to connect with the rock wall of the tunnel, and the top bracket is used to connect with the main arch ring of the tunnel, and the bottom bracket and the top bracket are connected to opposite ends of the main frame;

[0008] The main frame is bent and extended along its thickness direction.

[0009] In an optional embodiment, a first connecting portion and a second connecting portion are respectively provided at the bottom and the top of the main frame, and the first connecting portion and the second connecting portion cooperate with the bottom bracket and the top bracket respectively.

[0010] In an optional embodiment, the bottom bracket and the top bracket are respectively provided with a first mating groove and a second mating groove, and the first mating groove and the second mating groove are respectively mated with the first connecting portion and the second connecting portion.

[0011] In an optional embodiment, both the first matching groove and the second matching groove extend along the longitudinal direction of the tunnel.

[0012] In an optional embodiment, each main frame is provided with a positioning hole along the longitudinal direction of the tunnel, and the positioning hole is used to cooperate with the positioning column.

[0013] In an optional embodiment, a plurality of locking anchor rods are provided on the bottom bracket, and the bottom bracket is connected to the rock wall of the tunnel through the plurality of locking anchor rods.

[0014] In an optional embodiment, a side of the top bracket that is in contact with the main arch ring has a curved profile that is adapted to the main arch ring.

[0015] In a second aspect, the utility model provides a large-section tunnel support steel frame, which includes a plurality of the above-mentioned intermediate partition wall support steel frames; the plurality of intermediate partition wall support steel frames are sequentially arranged along the longitudinal direction of the tunnel;

[0016] The bottom bracket of each main frame is connected to the rock wall of the tunnel, and the top bracket of each main frame is connected to the main arch ring of the tunnel.

[0017] In an optional embodiment, the large-section tunnel support steel frame further includes positioning columns, which extend along the longitudinal direction of the tunnel and cooperate with the positioning holes of the plurality of main frame bodies.

[0018] In an optional embodiment, two adjacent middle partition wall support steel frames are spaced apart along the longitudinal direction of the tunnel.

[0019] The beneficial effects of the intermediate partition wall support steel frame and the large-section tunnel support steel frame provided by the embodiments of the present invention include:

[0020] The bulkhead support steel frame includes a bottom support, a top support, and a main frame; the bottom support is used to connect to the rock wall of the tunnel, and the top support is used to connect to the main arch ring of the tunnel, and the bottom support and the top support are connected to opposite ends of the main frame; wherein the main frame is curved and extended along its thickness direction. The bulkhead support steel frame adjusts the structural form of the bulkhead steel frame itself, changing the in-plane straight steel frame to an out-of-plane curved steel frame. While providing certain support to the main arch ring, the rigidity of the bulkhead steel frame is reduced, thereby reducing the internal force borne by the bulkhead steel frame itself, and making the bulkhead steel frame easier to dismantle. Therefore, by appropriately reducing the rigidity of the temporary bulkhead steel frame support, the internal force distribution of the bulkhead and the main arch ring can be adjusted, the bearing capacity of the initial support can be fully utilized, and a sufficient working surface can be provided to ensure the symmetrical construction of the pilot tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of the structure of a large-section tunnel support steel frame provided in this embodiment;

[0023] Figure 2 A schematic diagram of the structure of multiple bulkhead support steel frames and positioning columns provided in this embodiment;

[0024] Figure 3 A schematic diagram of the connection of multiple bulkhead support steel frames provided in this embodiment;

[0025] Figure 4 This is a schematic structural diagram of the bulkhead support steel frame provided in this embodiment.

[0026] Icons: 100-middle partition wall support steel frame; 200-large-section tunnel support steel frame; 210-positioning column; 110-bottom bracket; 120-top bracket; 130-main frame; 11-rock wall; 12-main arch ring; 131-first connecting part; 132-second connecting part; 133-positioning hole; 111-first matching groove; 121-second matching groove. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] 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 claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0029] 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, it does not need to be further defined or explained in subsequent drawings.

[0030] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0031] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0032] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention can be combined with each other.

[0033] Please refer to Figures 1-4 In this embodiment, a large-section tunnel support steel frame 200 is provided. The large-section tunnel support steel frame 200 includes a plurality of intermediate wall support steel frames 100. The plurality of intermediate wall support steel frames 100 are sequentially arranged along the longitudinal direction of the tunnel.

[0034] The middle partition supporting steel frame 100 includes a bottom bracket 110, a top bracket 120 and a main frame 130; the bottom bracket 110 and the top bracket 120 are connected to opposite ends of the main frame 130; and the main frame 130 is bent and extended along its thickness direction.

[0035] The bottom support 110 of each main frame 130 is connected to the rock wall 11 of the tunnel, and the top support 120 of each main frame 130 is connected to the main arch ring 12 of the tunnel.

[0036] It should be noted that the bending curvature of the main frame 130 along its thickness direction needs to be determined according to the actual project; and the top of the steel frame of the middle partition wall support steel frame 100 can be connected to the surrounding rock according to the project requirements, or it can be welded to the steel frame in the initial support of the tunnel, and the bottom of the steel frame is connected to the rock core wall through a locking anchor rod.

[0037] In summary, please refer to Figures 1-4 The working principle of the large-section tunnel support steel frame 200 using the intermediate partition support steel frame 100 is:

[0038] The large-section tunnel support steel frame 200 adopts a structural form in which a plurality of intermediate wall support steel frames 100 are arranged along the longitudinal direction of the tunnel, and the main frame body 130 of the intermediate wall support steel frame 100 is bent and extended along its thickness direction, and its bottom support 110 is used to connect with the rock wall 11 of the tunnel, and the top support 120 is used to connect with the main arch ring 12 of the tunnel. Thus, after the bottom support 110 of each main frame body 130 is connected to the rock wall 11 of the tunnel and the top support 120 of each main frame body 130 is connected to the main arch ring 12 of the tunnel, the tunnel can be stably supported. Moreover, such a structural support form is superior to the linear support in the prior art. As for the temporary middle partition wall steel frame support and the method of bending the middle partition wall steel frame into the plane, the middle partition wall support steel frame 100 changes the in-plane straight steel frame into an out-of-plane curved steel frame by adjusting the structural form of the middle partition wall steel frame itself. On the premise of providing certain support to the main arch ring 12, the stiffness of the middle partition wall steel frame is reduced, thereby reducing the internal force borne by the middle partition wall steel frame itself, and at the same time making the middle partition wall steel frame easy to dismantle. Therefore, by appropriately reducing the stiffness of the temporary middle partition wall steel frame support, the internal force distribution of the middle partition wall and the main arch ring 12 can be adjusted, the bearing capacity of the initial support can be fully exerted, and sufficient working surface can be provided to ensure the symmetrical construction of the guide tunnel.

[0039] Furthermore, based on the above-mentioned structural setting, during the construction process, the middle partition wall support steel frame 100 needs to be disassembled and assembled according to the construction progress of the tunnel. During the installation process, in order to improve its stability, it can be installed in the tunnel by welding, or it can be disassembled and assembled by disassembly and connection. It should be noted that the aforementioned welding form can be disassembled, and both the welding form and the detachable connection form can ensure its strength and support stability during use.

[0040] Among them, when adopting the welding installation method, the middle partition wall support steel frame 100 is designed and welded and installed as a frame of 3 meters. During the tunnel excavation process, it is welded and installed one by one and removed one by one; and the adjacent middle partition wall support steel frames 100 are welded to form a unified whole in the longitudinal direction.

[0041] In addition, in the process of implementing the above structure, the out-of-plane bending refers to the bending of the main frame 130 along its thickness direction, and its length direction is the height direction of the tunnel, its width direction is the longitudinal direction of the tunnel, and the longitudinal direction of the tunnel is the extension direction of the tunnel.

[0042] For further information, please refer to Figures 1-4When multiple middle partition wall support steel frames 100 are arranged along the extension direction of the tunnel, adjacent middle partition wall support steel frames 100 can be installed in a close-fitting manner, or two adjacent middle partition wall support steel frames 100 can be installed at intervals along the longitudinal direction of the tunnel. Both methods can ensure their performance.

[0043] Moreover, during use, in order to position the adjacent middle partition wall support steel frames 100 to ensure their installation accuracy and stability in use, the large-section tunnel support steel frame 200 also includes a positioning column 210, which extends along the longitudinal direction of the tunnel. The positioning column 210 is used to connect the main frame 130 of the adjacent middle partition wall support steel frame 100; it should be noted that in order to enable the middle partition wall support steel frame 100 to cooperate with the aforementioned positioning column 210, a positioning hole 133 is opened on the main frame 130 along the longitudinal direction of the tunnel, and the positioning column 210 cooperates with the positioning holes 133 of multiple main frames 130.

[0044] As can be seen from the above, this embodiment adopts a method of detachably connecting the main frame 130 with the bottom bracket 110 and the top bracket 120. When the bottom bracket 110 and the top bracket 120 are installed in the tunnel, they can be installed by welding or other connection methods according to the implemented structure. Similarly, when connecting the main frame 130 with the bottom bracket 110 and the top bracket 120, welding or other connection methods can also be used.

[0045] In this embodiment, the main frame 130 is detachably connected to the bottom bracket 110 and the top bracket 120. To enable the main frame 130 to be detachably connected to the bottom bracket 110 and the top bracket 120, a first connecting portion 131 and a second connecting portion 132 are respectively provided at the bottom and top of the main frame 130. The first connecting portion 131 and the second connecting portion 132 respectively cooperate with the bottom bracket 110 and the top bracket 120. In this way, the main frame 130 can be detachably connected to the bottom bracket 110 and the top bracket 120, thereby facilitating their assembly and disassembly.

[0046] For details, please refer to Figures 1-4 When installing the first connecting portion 131 and the second connecting portion 132, in order to facilitate cooperation therewith, the bottom bracket 110 and the top bracket 120 are respectively provided with a first cooperation groove 111 and a second cooperation groove 121. The first cooperation groove 111 and the second cooperation groove 121 cooperate with the first connecting portion 131 and the second connecting portion 132 respectively, and the first cooperation groove 111 and the second cooperation groove 121 both extend along the longitudinal direction of the tunnel.

[0047] To facilitate cooperation with the positioning column 210 , each main frame 130 is provided with a positioning hole 133 along the longitudinal direction of the tunnel. The positioning hole 133 is used to cooperate with the positioning column 210 .

[0048] Furthermore, based on the aforementioned structural arrangement, bottom bracket 110 is secured using multiple locking anchors, connecting bottom bracket 110 to tunnel rock wall 11 via these anchors. Furthermore, to increase the contact surface between top bracket 120 and primary arch 12 and enhance stability, the side of top bracket 120 that contacts primary arch 12 has a curved profile that matches primary arch 12.

[0049] It should be noted that, based on the above-mentioned structural setting, since the structural form adopted is a main frame 130, a top bracket 120 and a bottom bracket 110, on the basis of having the above-mentioned advantages, it is also possible to easily remove the main frame 130 from the top bracket 120 and the bottom bracket 110 after the main frame 130 is deformed during the support process, thereby facilitating its disassembly and assembly.

[0050] In summary, please refer to Figures 1-4 The large-section tunnel support steel frame 200 using the bulkhead support steel frame 100 is based on a large-section tunnel steel frame rock wall 11 combined construction method based on out-of-plane steel frame support. In this method, as the tunnel project continues to be excavated forward according to the steel frame rock wall 11 method, the bulkhead support steel frame 100 using the out-of-plane curved steel frame will be synchronously welded forward in blocks, and then shotcrete will be applied on the steel frame, and it will be connected to the rock wall 11 using locking anchor rods to form a bulkhead-rock wall 11 combined support system;

[0051] The material of the bulkhead support steel frame 100 is selected based on the actual needs of the project to ensure that its strength, corrosion resistance and durability meet the requirements, and is bent longitudinally (along the tunnel excavation direction) into an out-of-plane steel frame according to the angle required by the project;

[0052] The use of this type of steel frame has two main advantages. The first is that it provides a sufficient construction working surface, ensuring the symmetrical construction of the tunnel pilot hole, reducing the asymmetric deformation and stress concentration caused by construction on the initial support, and effectively controlling the deformation of the surrounding rock, thereby improving construction safety. The second is that the arc design of the middle partition wall steel frame in the longitudinal direction (along the tunnel excavation direction) can reduce the rigidity of the middle partition wall steel frame itself. Under the premise of providing certain support to the main arch ring 12, it will not generate excessive internal force inside the middle partition wall, which is convenient for subsequent demolition.

[0053] The above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. A bulkhead support steel frame, characterized by: The middle partition wall support steel frame includes a bottom bracket, a top bracket and a main frame; The bottom bracket is used to connect to the rock wall of the tunnel, and the top bracket is used to connect to the main arch ring of the tunnel, and the bottom bracket and the top bracket are connected to opposite ends of the main frame; Wherein, the main frame is bent and extended along its thickness direction.

2. The intermediate partition wall supporting steel frame according to claim 1, characterized in that: The bottom and the top of the main frame are respectively provided with a first connecting portion and a second connecting portion, and the first connecting portion and the second connecting portion are respectively matched with the bottom bracket and the top bracket.

3. The intermediate partition wall supporting steel frame according to claim 2, characterized in that: The bottom bracket and the top bracket are respectively provided with a first matching groove and a second matching groove, and the first matching groove and the second matching groove are respectively matched with the first connecting portion and the second connecting portion.

4. The intermediate partition wall supporting steel frame according to claim 3, characterized in that: The first matching groove and the second matching groove both extend along the longitudinal direction of the tunnel.

5. The intermediate partition wall supporting steel frame according to claim 1, characterized in that: Each of the main frames is provided with a positioning hole along the longitudinal direction of the tunnel, and the positioning hole is used to cooperate with the positioning column.

6. The intermediate partition wall supporting steel frame according to claim 1, characterized in that: The bottom bracket is provided with a plurality of locking anchor rods, and the bottom bracket is connected to the rock wall of the tunnel through the plurality of locking anchor rods.

7. The intermediate partition wall supporting steel frame according to claim 1, characterized in that: The side of the top bracket used for contacting the main arch ring has an arc-shaped profile adapted to the main arch ring.

8. A large-section tunnel support steel frame, characterized by: The large-section tunnel support steel frame comprises a plurality of intermediate partition wall support steel frames according to any one of claims 1 to 7; the plurality of intermediate partition wall support steel frames are arranged in sequence along the longitudinal direction of the tunnel; The bottom bracket of each main frame is connected to the rock wall of the tunnel, and the top bracket of each main frame is connected to the main arch ring of the tunnel.

9. The large-section tunnel support steel frame according to claim 8, characterized in that: The large-section tunnel support steel frame further includes a positioning column, which extends along the longitudinal direction of the tunnel and cooperates with a plurality of positioning holes of the main frame.

10. The large-section tunnel support steel frame according to claim 8, characterized in that: Along the longitudinal direction of the tunnel, two adjacent middle partition wall support steel frames are arranged at intervals.

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