Protective safety structure for tunnel fault fracture zone construction method

Abstract

The utility model relates to the technical field of a protection safety structure for a tunnel fault fracture zone construction method, and discloses a protection safety structure for a tunnel fault fracture zone construction method, which comprises a wood pattern used for fixing cement, and a plurality of groups of template supports fixedly arranged on the wood pattern and used for fixing the wood pattern. C15 concrete with the thickness of 1.0 m, three groups of C15 concrete with the thickness of 2.0 m and C30 concrete with the thickness of 2.5 m are sequentially laid, and the multiple layers of concrete form a firm composite structure. The thicker concrete layer can effectively fill gaps and holes of a tunnel fault, support rocks around a hole body, reduce the risk of block falling, improve the overall stability and bearing capacity of the tunnel and enhance the protection effect on a fault fracture zone.

Description

Technical Field

[0001] This utility model relates to the technical field of protective safety structures for construction methods of tunnel fault fracture zones, specifically a protective safety structure for construction methods of tunnel fault fracture zones. Background Technology

[0002] In the process of tunnel excavation in water conservancy construction projects, complex and challenging geological conditions are often encountered. When encountering adverse geological fault fracture zones, the rocks in these areas are broken and loosely structured, making them prone to continuous rockfalls and even causing large-scale roof collapses in the tunnel. This situation seriously hinders the normal tunnel excavation operation and brings great obstacles to the construction.

[0003] If conventional construction techniques are used to address such situations, workers on the construction site are constantly at risk of being injured by falling rocks, and machinery may also be damaged by the impact of rocks, posing extremely high safety risks. At the same time, frequent rockfalls and roof collapses severely hinder construction progress, making it difficult to ensure the project proceeds on schedule. Under these severe circumstances, it is necessary to develop a safe construction technology that can effectively address the problem of continuous rockfalls in the fault fracture zone of the tunnel. Utility Model Content

[0004] The purpose of this utility model is to solve the problem of large-area roof collapse in tunnels, the danger of workers being injured by falling rocks, and the potential damage to mechanical equipment due to rock impacts, in the existing technology. Therefore, a protective safety structure for tunnel fault fracture zone construction method is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] It includes wooden molds for fixing cement, and multiple sets of template supports are fixedly arranged on the wooden molds to fix the wooden molds.

[0007] A 1.0m thick layer of C15 concrete is arranged below one side of the wooden mold, and three sets of 2.0m thick layers of C15 concrete are placed on top of the 1.0m thick layer of C15 concrete. A 2.5m thick layer of C30 concrete is placed above the 2.0m thick layer of C15 concrete. The 1.0m thick and 2.0m thick layers of C15 concrete are used to fill the tunnel fault.

[0008] As a further description of the above technical solution:

[0009] The 2.5m thick C30 concrete has a cavity, and a pre-embedded pump pipe is arranged on the 2.5m thick C30 concrete. A pre-embedded grouting pipe is arranged on one side of the pre-embedded pump pipe for pre-embedding.

[0010] As a further description of the above technical solution:

[0011] A second blasting excavation area is arranged on one side of the 2.5m thick C30 concrete for the second blasting, and a first blasting excavation area is arranged on one side of the second blasting excavation area for the first blasting.

[0012] This utility model has the following beneficial effects:

[0013] 1. A 1.0m thick layer of C15 concrete, three sets of 2.0m thick layers of C15 concrete, and a 2.5m thick layer of C30 concrete were laid sequentially, forming a robust composite structure. The thicker concrete layers effectively filled the gaps and cavities in the tunnel fault, supported the surrounding rock, reduced the risk of rockfall, improved the overall stability and load-bearing capacity of the tunnel, and enhanced its protective effect on the fault fracture zone.

[0014] 2. The wooden formwork, combined with multiple sets of template supports, provides a stable mold for concrete pouring, ensuring that the concrete maintains its designed shape during the solidification process and enhancing structural stability. In tunnel fault zones, it prevents concrete deformation due to impacts from falling blocks during pouring, ensuring construction safety and quality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of concrete pouring for a protective safety structure for a construction method of a fault fracture zone in a tunnel, as proposed in this utility model.

[0016] Figure 2 This is a schematic diagram of the blasting excavation area for a protective safety structure used in the construction method of fault fracture zones in tunnels, as proposed in this utility model.

[0017] Legend: 1. Template support; 2. Embedded support tie rod; 3. Wooden formwork; 4. 1.0m thick C15 concrete; 5. 2.0m thick C15 concrete; 6. 2.5m thick C30 concrete; 7. Embedded pump pipe; 8. Embedded grouting pipe; 9. First blasting excavation area; 10. Second blasting excavation area. Detailed Implementation

[0018] 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.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The utility model will be further described in detail below with reference to the accompanying drawings.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Example 1:

[0022] Reference Figures 1-2 This utility model provides a protective safety structure for a construction method of tunnel fault fracture zone;

[0023] During the backfilling concrete stage, the first step is to use an excavator to clear the accumulated rockfalls and ensure the safety of the construction site. Formwork is erected 2 meters back from the junction of the section of continuous rockfall in the tunnel fault fracture zone and the already supported tunnel section. This distance ensures that the falling rockfalls will not pose a threat to personnel.

[0024] During the bottom backfilling, bamboo plywood, 5×8cm square timber supports, and steel pipes were used to fix the wooden formwork. C15 concrete was pumped using a self-mixing pump and flowed into the formwork by gravity using a concrete mixer truck and a simple chute, without the need for vibration. The pouring thickness was controlled within 1m. No loose blocks were removed during the pouring process. When the process was nearing completion, upper internal support strips (Φ14 steel bars) were pre-embedded. At the end of the process, the concrete on the formwork side was about 20cm higher than the working face side.

[0025] Before backfilling the intermediate layer, a working scaffold is erected. The formwork is fixed in a similar way to the bottom layer. Self-mixed C15 concrete is still used and pumped into the formwork by a pump truck. No roughening is required between layers. The thickness of each layer is controlled within 2m. Similarly, when the layer is nearing completion, the upper layer inner support tie rod is pre-embedded. When the pouring is completed, the concrete on the side closest to the formwork is kept slightly higher.

[0026] The top backfill template is the same as the bottom template, with the tie rod spacing appropriately increased. A Φ125 pump pipe and a Φ32 galvanized steel pipe are pre-embedded and fixed at the top for venting and grouting and to seal the template. C30 concrete is pumped by a self-mixing pump and pumped into the formwork by a 60-type pump truck. No vibration or roughening is required. The project quantity is calculated backward to pour a thickness of more than 2.5m.

[0027] Seven days after the concrete pouring was completed, blasting excavation was carried out in two stages: first, a central V-shaped excavation was carried out, followed by peripheral widening. The blasting vibration velocity was within 2 cm / s, and the cycle advance was within 1 m. After each blasting cycle, steel arches were erected, deformation monitoring instruments were installed, and anchor spraying was applied in a timely manner according to the Class V surrounding rock support design. Low-grade concrete was backfilled, and blasting excavation and support were carried out again. High-grade concrete was set on the arch top to form a safety barrier to prevent continuous rockfall, reducing the safety risks to construction personnel and equipment.

[0028] The detailed implementation methods disclosed in this article omit the detailed descriptions of known functions and known components. In order to ensure the compatibility of the assemblies, the operating methods adopted are consistent with the pipe diameter parameters of the market.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A protective safety structure for construction methods in fault fracture zones of tunnels, characterized in that: Includes a wooden mold (3) for fixing cement, and multiple sets of template supports (1) are fixedly arranged on the wooden mold (3) to fix the wooden mold (3); A 1.0m thick C15 concrete (4) is arranged below one side of the wooden mold (3), and three sets of 2.0m thick C15 concrete (5) are arranged on the 1.0m thick C15 concrete (4), and a 2.5m thick C30 concrete (6) is arranged above the 2.0m thick C15 concrete (5). The 1.0m thick C15 concrete (4) and the 2.0m thick C15 concrete (5) are used to fill the tunnel fault.

2. The protective safety structure for construction methods in fault fracture zones of tunnels according to claim 1, characterized in that: The 2.5m thick C30 concrete (6) has a cavity, and a pre-embedded pump pipe (7) is arranged on the 2.5m thick C30 concrete (6), and a pre-embedded grouting pipe (8) is arranged on one side of the pre-embedded pump pipe (7).

3. A protective safety structure for construction methods in fault fracture zones of tunnels according to claim 2, characterized in that: A second blasting excavation area (10) is arranged on one side of the 2.5m thick C30 concrete (6) for the second blasting, and a first blasting excavation area (9) is arranged on one side of the second blasting excavation area (10) for the first blasting.

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