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CN-224214197-U - Permanent-face combined protection system for tunnel top collapse cavity treatment

CN224214197UCN 224214197 UCN224214197 UCN 224214197UCN-224214197-U

Abstract

The utility model discloses a permanent combined protection system for treating a cavity collapse at the top of a tunnel, which is easy to cause safety accidents in tunnel construction, and has a plurality of limitations in the traditional treatment method. The core of the protection system is a protection air bag which is made of rubber, can be customized according to the actual condition of the collapse cavity, can be filled with the collapse cavity in a conformal way after being inflated to form temporary support, and can be converted into permanent support after being injected with concrete in an inflated state. The protective air bag is provided with an inflation inlet, an exhaust port and a tubular exhaust channel, and is matched with the valve component, the air pressure monitoring device, the grouting pipe and the auxiliary fixing component to work cooperatively. During construction, the collapse cavity is pre-reinforced, data are obtained through scanning to manufacture the air bag, and the air bag is converted into a permanent support through temporary support after being installed. The system can effectively prevent falling rocks, ensure construction safety, adapt to complex collapse cavities, has low cost, convenient construction and short construction period, has obvious advantages compared with the traditional method, and provides a more reliable solution for tunnel construction.

Inventors

  • FENG SHUBIAO
  • SONG HUIXING
  • XIA JIALIN
  • XU WEIPING
  • LIU ZHILI
  • SUN KEGUO

Assignees

  • 中铁十四局集团第二工程有限公司
  • 西南交通大学

Dates

Publication Date
20260508
Application Date
20250224

Claims (7)

  1. 1. The permanent combined protection system for the treatment of the collapse cavity at the top of the tunnel is characterized by comprising a protection air bag (3) made of rubber materials, wherein the protection air bag is configured to be capable of conformably filling the whole space of the collapse cavity (1) at the top of the tunnel after being inflated to form temporary support, and the protection air bag (3) is also configured to be capable of injecting concrete into the protection air bag in the temporary support in the inflated state so that the protection air bag (3) is converted into permanent support by the temporary support; The protective airbag (3) comprises a top surface part, a bottom surface part and a side surface part which is connected with the top surface part and the bottom surface part and surrounds a circle at the side, and the bottom surface part is provided with an inflation inlet and an exhaust outlet; The air bag protection device further comprises a valve assembly, wherein the valve assembly comprises an air charging valve (5) and an air discharging valve (6), and the air charging valve (5) and the air discharging valve (6) are respectively arranged at an air charging port and an air discharging port of the protection air bag (3) and are used for controlling air in the air bag to enter and exit; A tubular exhaust channel (8) is arranged in the protective air bag (3), one end of the tubular exhaust channel (8) stretches into the inner top of the air bag, the other end of the tubular exhaust channel is connected to the exhaust port, and the tubular exhaust channel (8) is configured to exhaust air and balance the air pressure inside and outside the air bag in the concrete injection process; The protective airbag (3) can be inflated through the inflation valve to enable the protective airbag to serve as a temporary treatment device, foam concrete can be injected into the protective airbag through the inflation valve through the inflation port, and after the foam concrete uniformly flows out of the exhaust valve through the tubular exhaust channel, the injection of the foam concrete is stopped, and the inflation valve and the exhaust valve are closed, so that the protective airbag is converted into a permanent collapse treatment device from the temporary treatment device.
  2. 2. The permanent bonding protection system according to claim 1, wherein the tubular exhaust channel (8) body is composed of a water seepage spring steel tube (9) and is externally wrapped with a rubber shell, and the rubber shell is connected with the inner wall of the protection air bag (3).
  3. 3. The permanent bonding protection system according to claim 2, further comprising an air pressure monitoring device (4), wherein the air pressure monitoring device (4) is installed at the inner top of the protection air bag (3) and is used for monitoring the air pressure inside the air bag in real time so as to ensure the pressure stability of the air bag.
  4. 4. The permanent face combined protection system according to claim 3, further comprising a grouting pipe (7), wherein the grouting pipe (7) is arranged between the outer side of the protection air bag (3) and the inner wall of the collapse cavity (1), one end of the grouting pipe is arranged between the outer side of the protection air bag (3) and the inner wall of the collapse cavity (1), the other end of the grouting pipe extends to the outer side of the collapse cavity (1), and when the protection air bag (3) is converted from temporary support to permanent support, gaps between the air bag and the inner wall of the collapse cavity (1) are grouting through the grouting pipe (7) so as to enhance the stability of the support structure.
  5. 5. The permanent bonding protection system according to claim 4, further comprising an auxiliary fixing assembly, wherein the auxiliary fixing assembly comprises a plurality of flexible stay ropes and anchoring pieces, one ends of the flexible stay ropes are connected with the surface of the protection air bag (3), and the other ends of the flexible stay ropes are connected with the anchoring pieces arranged on the inner wall of the collapse cavity (1) at the top of the tunnel, and the auxiliary fixing assembly is used for enabling the protection air bag (3) to be tightly attached to the inner wall of the collapse cavity (1) and preventing the protection air bag from being displaced or deformed.
  6. 6. The permanent bonding protection system according to any one of claims 1-5, wherein the external shape and size of the protection air bag (3) can be customized according to the internal practical conditions of the tunnel top collapse cavity (1) in different projects, and the protection air bag is made of rubber, and can be tightly attached to the inner wall of the collapse cavity (1) after being inflated.
  7. 7. The permanent bonding protection system according to claim 6, further comprising a shotcrete device for pre-reinforcing the collapse cavity (1) and a scanning device for acquiring three-dimensional data of the collapse cavity (1), wherein the data acquired by the scanning device is used for manufacturing a protection airbag (3) adapted to the collapse cavity (1).

Description

Permanent-face combined protection system for tunnel top collapse cavity treatment Technical Field The utility model relates to the technical field of tunnel construction, in particular to a permanent temporary combined protection system for treating a collapse cavity at the top of a tunnel. Background In the construction process in the field of tunnel engineering, the tunnel top often forms a collapse cavity area due to factors such as the change of geological conditions, disturbance of surrounding rock in the construction process and the like, and the collapse, collapse and even roof collapse phenomena possibly occur, so that the construction accident is caused by the damage of a tunnel structure, and the stability and the construction safety of the tunnel are seriously threatened. At present, the traditional tunnel collapse cavity treatment method generally adopts the technologies of concrete backfilling, steel frame supporting and the like, and has certain limitations although temporary or permanent supporting can be provided to a certain extent. The concrete backfilling method can increase the local bearing capacity of the lining below the collapse cavity due to the heavy concrete or mortar, and easily causes the deformation of the primary support of the tunnel, and the steel frame supporting method can easily cause the increase of construction difficulty and cost due to the self weight and installation complexity of the steel frame. In addition, these methods are difficult to accommodate the irregular internal shape of the collapsed cavity, and thus cannot effectively prevent the subsequent deformation and collapse of the collapsed cavity that may exist. Despite the improvement measures against the problems, the prior art still cannot fully meet the requirements of quick, economical and effective treatment of the collapsed cavity in tunnel construction. Therefore, the development of the treatment method which can adapt to the complex shape of the collapse cavity of the tunnel and provide quick and stable support has important significance in ensuring the construction safety of the tunnel, improving the construction efficiency and reducing the engineering cost. Disclosure of utility model The utility model aims to provide a permanent combined protection system for treating a collapse cavity at the top of a tunnel, so as to solve the limitation of the traditional tunnel collapse cavity treatment method, realize the rapid, economical and effective treatment of the collapse cavity at the top of the tunnel, further ensure construction safety, improve construction efficiency, reduce construction cost and ensure supporting effect. The technical scheme adopted by the utility model is as follows: The utility model discloses a permanent combined protection system for treating a collapse cavity at the top of a tunnel, which comprises a protection air bag, wherein the protection air bag is configured to be capable of carrying out conformal filling on the whole space of the collapse cavity at the top of the tunnel after being inflated to form a temporary support, and is also configured to be capable of injecting concrete into the protection air bag in the inflation state of the temporary support so as to enable the protection air bag to be converted into a permanent support from the temporary support. In the utility model, when the tunnel is constructed, the protective airbag can be tightly attached to the whole space of the collapse cavity after being inflated, thereby effectively preventing falling rocks from injuring constructors and equipment and guaranteeing construction safety, and after the temporary support is converted into the permanent support, the collapse cavity can be continuously supported, the stability of surrounding rocks is enhanced, and the safety and reliability of tunnel construction and subsequent operation are ensured. Compared with the traditional treatment methods such as concrete backfilling and steel frame supporting, the protective airbag has the advantages of low manufacturing cost, simple and convenient construction process, capability of rapidly completing support conversion, reduction of construction time, reduction of expenses such as labor and equipment leasing, and the like, thereby greatly reducing the construction cost. When the collapse cavity is found, tunneling can be rapidly stopped, temporary support is formed by rapid installation and inflation, related equipment is converted into permanent support after passing through the temporary support, the construction flow is concise and efficient, the construction efficiency is greatly improved, and the tunnel engineering progress is accelerated. Moreover, the protective airbag adopts a slow inflation filling mode, so that the disturbance to surrounding rock is very small, the original state and stability of the surrounding rock can be maintained, the safety risk caused by construction disturbance is reduced, and the whole stabi