Self-walking composite support suitable for dismantling existing lining of pedestrian transverse hole of operating highway tunnel

Abstract

The utility model discloses a self-walking composite support suitable for dismantling an existing lining of a pedestrian transverse hole of an operating highway tunnel, which relates to the technical field of tunnel construction and comprises two composite supports which need to be used simultaneously and are used for supporting dismantling operation of a dismantling lining of the pedestrian transverse hole and dismantling operation of a dismantling bottom plate of the pedestrian transverse hole. Each composite support is composed of a profile steel arch frame, an arch line profile steel cross brace, an arch foot profile steel cross brace, a supporting wheel and a protective net, the profile steel arch frames are longitudinally connected, the profile steel arch frames are longitudinally arranged along the pedestrian transverse hole, the two composite supports are symmetrically arranged to form an asymmetric multi-arch support, materials and space are saved, and the asymmetric multi-arch support is suitable for narrow pedestrian transverse hole scenes. The supporting wheels are designed to achieve manual rapid pushing of a supporting system, repeated construction of temporary supports is avoided, the construction time is remarkably shortened, the influence on operation tunnel traffic is reduced, a rigid supporting system is formed by the profile steel arches and the cross braces, and surrounding rock deformation in the dismantling process is effectively resisted.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, specifically a self-propelled composite support suitable for the removal of existing linings in pedestrian cross passages of operating highway tunnels. Background Technology

[0002] Pedestrian cross passages in highway tunnels are crucial evacuation and escape routes during tunnel operation, playing an indispensable role in ensuring personal and property safety in emergencies. Due to factors such as engineering geology, construction quality, extended operating time, and maintenance management, pedestrian cross passages often exhibit serious structural defects such as lining cracks and floor slab bulging and deformation, making repair and reinforcement essential. Repair methods like lining reinforcement and shotcrete reinforcement require sufficient space to ensure that no structure or component encroaches on the building boundary after reinforcement. However, the limited space of a pedestrian cross passage (2.5m high and 2.0m wide) cannot guarantee this non-encroachment requirement after implementing these methods. Therefore, repairing and reinforcing severely damaged pedestrian cross passages necessitates partial or complete removal of the existing lining structure. The removal process disturbs the already stable surrounding rock-support system, potentially disrupting its stress self-balance and leading to collapse of the removed section, impacting the lining structure of adjacent sections that have not yet been removed. Furthermore, due to the difficulties in traffic organization in operating tunnels, the rapid and safe dismantling of the lining structure is particularly important. This utility model patent aims to provide a safe and rapid structural support for dismantling the lining of pedestrian cross passages, ensuring the stability of the surrounding rock-support system and the safety of workers during the dismantling process. Therefore, based on the above-mentioned research and combined with existing technologies, a self-propelled composite support suitable for dismantling existing linings of pedestrian cross passages in operating highway tunnels is proposed to solve the above problems. Utility Model Content

[0003] The purpose of this utility model is to provide a self-propelled composite support suitable for the removal of existing linings in pedestrian cross passages of operating highway tunnels, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A self-propelled composite support for the removal of existing lining in pedestrian cross passages of operating highway tunnels includes two composite supports that need to be used simultaneously. The composite supports are used to support the removal of the lining and the bottom plate of the pedestrian cross passage. The composite support consists of three longitudinally connected steel arch frames, arch-line steel cross braces, arch foot steel cross braces, support wheels, and protective netting. The steel arch frames are arranged longitudinally along the pedestrian cross passage, with an adjacent steel arch frame spaced 1m apart. The three arch frames are connected into a whole by welding longitudinal connecting bars to form the rigid skeleton of the composite support.

[0006] Furthermore, the steel arch frame is assembled from sections of arc-shaped arch frames and sections of vertical arch frames by connecting steel plates and high-strength bolts. The arc-shaped arch frames support the arch section of the pedestrian cross passage lining to be demolished, and the vertical arch frames support the side walls of the pedestrian cross passage lining to be demolished. Each arch frame has arch-line steel cross braces and arch-foot steel cross braces at the arch line and arch foot positions, respectively. The arch-line steel cross braces and arch-foot steel cross braces are connected to the steel arch frame by high-strength bolts. The distance between the bottom surface of the arch-foot steel cross brace and the top surface of the pedestrian cross passage demolition base plate is 40cm, and the distance between the bottom of the vertical arch frame and the top surface of the pedestrian cross passage demolition base plate is 10cm.

[0007] Furthermore, the support wheels are installed below the arch foot steel cross brace. Each composite support is equipped with 4 support wheels. The top of the support wheel is provided with a steel plate with reserved bolt holes. It is fixedly connected to the arch foot steel cross brace by bolts to form a self-propelled structure that can be manually moved.

[0008] Furthermore, the protective netting is laid entirely on the outside of the steel arch frame, and wooden wedges are used to fill the gaps between the protective netting and the lining of the pedestrian tunnel.

[0009] Furthermore, the two composite supports are symmetrically arranged on both sides of the demolition section of the pedestrian cross passage lining removal, with a net distance between them not exceeding 5m.

[0010] Furthermore, the composite support's steel arch frame, arch-line steel cross brace, and arch foot steel cross brace are all prefabricated components in the factory and assembled on-site using high-strength bolts.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. Asymmetrical arch support is formed by symmetrical arrangement of two composite supports, saving materials and space. It is suitable for narrow pedestrian cross passages. The support wheel design enables rapid manual movement of the support system, avoiding repeated temporary support construction, significantly shortening construction time and reducing the impact on traffic in the operating tunnel. The steel arch frame and cross brace form a rigid support system, effectively resisting the deformation of the surrounding rock during demolition. The protective net combined with wooden wedges not only blocks falling objects but also ensures uniform stress, improving construction safety. The factory prefabrication and on-site bolt connection of components greatly shortens the operation time in the tunnel, meeting the "short-time control and rapid construction" requirements of operating tunnels. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the composite support structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the connection structure between the lining and the steel arch frame of the pedestrian cross passage in this utility model.

[0015] Figure 3 This is an enlarged schematic diagram of the support wheel structure of this utility model.

[0016] In the diagram: 1. Demolition of lining for pedestrian cross passage; 2. Demolition of bottom slab for pedestrian cross passage; 3. Steel arch frame; 4. Arch-shaped steel cross brace; 5. Arch foot steel cross brace; 6. Support wheel; 7. Protective net; 8. Bolt. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In one typical implementation of this application, please refer to Figures 1-3 Figure 1 shows a self-propelled composite support for the demolition of existing linings in pedestrian cross passages of operating highway tunnels. It includes two composite supports that need to be used simultaneously. The composite supports are used to support the demolition of the lining 1 and the bottom plate 2 of the pedestrian cross passage. Its core structure consists of the following parts.

[0019] Three longitudinally connected steel arch frames 3 are arranged longitudinally along the pedestrian cross passage, with an interval of 1m between adjacent steel arch frames 3. They are connected as a whole by welding longitudinal connecting bars to form a rigid skeleton. Arch line steel cross braces 4 and arch foot steel cross braces 5 are respectively set at the arch line and arch foot positions of each arch frame, and are connected to the steel arch frame 3 by high-strength bolts to enhance the lateral rigidity of the structure. Support wheels 6 are installed below the arch foot steel cross braces 5, with 4 wheels set for each composite support. They are fixed to the arch foot steel cross braces 5 by steel plates with bolt holes on the top to form a self-propelled structure that can be moved manually. The protective net 7 is laid on the outside of the steel arch frame 3 to block concrete or surrounding rock from falling during the demolition process.

[0020] The steel arch frame 3 is composed of one section of arc-shaped arch frame and two sections of vertical arch frame spliced ​​together by connecting steel plates and high-strength bolts. The arc-shaped arch frame corresponds to the arch of the lining 1 for the pedestrian cross passage demolition, and the vertical arch frame corresponds to the side wall. The bottom surface of the arch foot steel cross brace 5 is 40cm away from the top surface of the pedestrian cross passage demolition base plate 2, and the bottom of the vertical arch frame is 10cm away from the top surface of the base plate. This ensures the stability of the support and also leaves space for the base plate demolition operation.

[0021] Two composite supports are symmetrically arranged on both sides of the demolition section of the pedestrian cross passage lining 1, with a net distance of no more than 5m, forming an asymmetrical arch support structure without a central wall.

[0022] The demolition work follows the principle of "arch first, side walls later, demolition and replacement as needed, minimal disturbance, frequent measurements, and early ring formation." Dedicated personnel are stationed at both ends of the work area to monitor the surrounding rock and lining condition, and cross-operations and entry by non-operation personnel are strictly prohibited.

[0023] The steel arch frame 3, the arch line steel cross brace 4, and the arch foot steel cross brace 5 are all prefabricated components in the factory and are quickly assembled on site using high-strength bolts. After a section is demolished and rebuilt and the concrete strength meets the standards, the support system is quickly transferred by pushing the support wheel 6, and the operation is repeated.

[0024] As a preferred embodiment of this example, please refer to [link / reference]. Figures 1-3 The specific construction steps are as follows:

[0025] Step 1: Conduct on-site inspection of the damaged pedestrian tunnel, formulate a demolition plan, delineate demolition units, remove fire doors, lighting fixtures and other facilities, relocate cables, distribution boxes and other pipelines, and prefabricate steel arch frames 3, arch line steel cross braces 4, arch foot steel cross braces 5 and other components outside the tunnel, and check the high-strength bolts, welding quality and support wheel performance 6.

[0026] Step 2: On both sides of the first section to be demolished, assemble the steel arch frame 3 on site at a spacing of 1m / frame. Connect the arc arch frame and the vertical arch frame by connecting steel plates and high-strength bolts, and weld the longitudinal connecting bars to form a three-frame overall skeleton. Install the arch line steel cross brace 4 and the arch foot steel cross brace 5, ensuring that the bolt connection is firm. Adjust the design height of the bottom surface of the arch foot steel cross brace 5 to 40cm from the top surface of the base plate 2 and the bottom of the vertical arch frame to 10cm from the top surface of the base plate.

[0027] Step 3: Lay a protective net 7 on the outside of the steel arch frame 3 and fix it by binding or welding. Fill the gap between the protective net and the existing lining with wooden wedges to ensure the overall force of the support system. Use small machinery to lift the composite support and install 4 support wheels 6. Fix the support wheels to the arch foot steel cross brace 5 with bolts 8.

[0028] Step 4: Two composite supports are symmetrically arranged on both sides of the demolition section, with a net distance of ≤5m, forming an asymmetrical arch support. The lining 1 of the pedestrian cross passage is demolished in the order of "arch first, then side wall". The principle of "replacing as you demolish and forming a ring as soon as possible" is followed. During the demolition process, the deformation of the surrounding rock and the status of the support structure are monitored in real time. After the demolition is completed, the formwork is installed in time, the lining structure concrete is poured, and the formwork is removed after curing for more than 7 days and the strength reaches the design requirements. The support wheels 6 are manually pushed to push the composite support to the next section to be demolished. The above process is repeated until the demolition and reconstruction of the entire pedestrian cross passage is completed.

[0029] Through an asymmetric, wallless structural design, self-propelled functionality, and prefabrication assembly technology, the existing lining of pedestrian cross passages in operating highway tunnels was safely and efficiently dismantled, providing an innovative support solution for similar projects.

[0030] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A self-propelled composite support suitable for dismantling existing linings in pedestrian cross passages of operating highway tunnels, characterized in that, It includes two composite supports that need to be used simultaneously. The composite supports are used to support the demolition of the lining (1) and the bottom plate (2) of the pedestrian cross passage. The composite supports are composed of three longitudinally connected steel arch frames (3), arch steel cross braces (4), arch foot steel cross braces (5), support wheels (6) and protective nets (7). The steel arch frames (3) are arranged longitudinally along the pedestrian cross passage. The spacing between adjacent steel arch frames (3) is 1m / frame. The three arch frames are connected into a whole by welding longitudinal connecting bars to form the stiff skeleton of the composite support.

2. The self-propelled composite support for removing existing lining in pedestrian cross passages of operating highway tunnels according to claim 1, characterized in that: The steel arch frame (3) is spliced ​​together by connecting steel plates and high-strength bolts, consisting of one arc-shaped arch frame and two vertical arch frames. The arc-shaped arch frame supports the arch of the pedestrian tunnel lining (1) and the vertical arch frame supports the side wall of the pedestrian tunnel lining (1). Each arch frame has an arch-shaped steel cross brace (4) and an arch-shaped steel cross brace (5) at the arch line and arch foot positions, respectively. The arch-shaped steel cross brace (4) and the arch-shaped steel cross brace (5) are connected to the steel arch frame (3) by high-strength bolts. The bottom surface of the arch-shaped steel cross brace (5) is 40cm away from the top surface of the pedestrian tunnel bottom plate (2) and the bottom of the vertical arch frame is 10cm away from the top surface of the pedestrian tunnel bottom plate (2).

3. A self-propelled composite support for removing existing lining in pedestrian cross passages of operating highway tunnels, as described in claim 2, is characterized in that: The support wheel (6) is installed below the arch foot steel cross brace (5). Each composite support is equipped with 4 support wheels (6). The top of the support wheel (6) is provided with a steel plate with reserved bolt holes. It is fixedly connected to the arch foot steel cross brace (5) by bolts (8) to form a self-propelled structure that can be manually moved.

4. A self-propelled composite support for removing existing lining in pedestrian cross passages of operating highway tunnels, as described in claim 3, is characterized in that: The protective net (7) is laid on the outside of the steel arch frame (3), and the gap between the protective net (7) and the lining (1) of the pedestrian tunnel is filled with wooden wedges.

5. A self-propelled composite support for removing existing lining in pedestrian cross passages of operating highway tunnels, as described in claim 4, is characterized in that: The two composite supports are symmetrically arranged on both sides of the demolition section of the pedestrian tunnel lining (1), with a net distance between them not exceeding 5m.

6. A self-propelled composite support for removing existing lining in pedestrian cross passages of operating highway tunnels, as described in claim 5, is characterized in that: The composite support steel arch frame (3), arch line steel cross brace (4), and arch foot steel cross brace (5) are all prefabricated components in the factory and assembled on site using high-strength bolts.

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