Supporting device for construction of diversion tunnel of hydropower station

Abstract

The utility model discloses a supporting device for construction of a diversion tunnel of a hydropower station, which belongs to the technical field of tunnel supporting and comprises an anchor rod, two groups of first supporting profiles and second supporting profiles, and the two groups of first supporting profiles and second supporting profiles are spliced together to form a first structure consistent with the section of the tunnel. Positioning holes and threaded holes are integrally formed in the first supporting profile and the second supporting profile, and threaded rods are in threaded connection with the interiors of the threaded holes; and the edge of the protective net is fastened at the end part of the threaded rod. The first supporting profile and the second supporting profile are assembled and then are matched with the system anchor rod to achieve stable mounting and fixing, so that the safe bearing effect on a tunnel is improved under the assembly supporting of the first supporting profile and the second supporting profile, meanwhile, the protective net is arranged and can be matched with high-pressure sprayed concrete for reinforcement, the cohesiveness of a concrete layer is enhanced, and the service life of the tunnel is prolonged. Therefore, the safety of the whole support is improved.

Description

Technical Field

[0001] This utility model relates to the field of tunnel support technology, and in particular to a support device for the construction of a water diversion tunnel in a hydropower station. Background Technology

[0002] In the construction of hydropower stations, the excavation and support protection of water diversion tunnels are particularly critical. They not only affect the progress of the entire project, but are also an important prerequisite for ensuring the safe and stable operation of the hydropower station. Therefore, depending on the cross-sectional shape of the tunnel, such as an arch-shaped structure, the excavation method and support protection measures must be clearly defined before construction to ensure safety and quality during the construction process. Thus, the performance of its support device is of paramount importance.

[0003] An investigation revealed that a Chinese utility model patent (publication number CN516429649U) discloses a support device for a water diversion tunnel under high ground stress conditions. The device includes two columns and an arc-shaped support plate. Each column has a third fixing block fixed to its surface. A third limiting groove is formed through the interior of each third fixing block, and a metal rod passes through the interior of each limiting groove. The top of the metal rod is welded to the arc-shaped support plate. A first limiting groove is formed inside the metal rod. Through the design of the pull plate, metal rod, first limiting groove, second limiting groove, first fixing block, third fixing block, first locking block, fourth limiting groove, and guide rod, the height of the device can be adjusted, improving structural flexibility and better meeting user needs. The designed ball bearings reduce friction during the sliding process of the metal rod.

[0004] Although the aforementioned patent can achieve height adjustment of the device, its support device has certain limitations in actual use. It can only achieve local support and protection, and its support safety is low. It cannot effectively guarantee the comprehensiveness and safety of the support device.

[0005] Therefore, this utility model provides a support device for the construction of a water diversion tunnel in a hydropower station to solve the above-mentioned problems. Utility Model Content

[0006] The purpose of this utility model is to design a support device for the construction of a water diversion tunnel in a hydropower station in order to solve the above problems.

[0007] This utility model achieves the above objectives through the following technical solutions:

[0008] A support device for the construction of a water diversion tunnel in a hydropower station includes:

[0009] Anchor bolt; the outer wall of the anchor bolt is fitted with a nut and a washer;

[0010] Two sets of first support profiles and second support profiles are spliced ​​together to form a structure consistent with the tunnel cross section and supported on the inner wall of the tunnel. The first support profile and the second support profile are integrally provided with positioning holes and threaded holes. An anchor rod passes through the inside of the positioning hole, and a threaded rod is threadedly connected to the inside of the threaded hole.

[0011] A protective net, the edge of which is fastened to the end of the threaded rod located outside the first and second support profiles.

[0012] Specifically, each set of the first and second support profiles is connected to two sets of anchor rods. The first end of the anchor rod is anchored in the surrounding rock, and the second end of the anchor rod is inserted into the positioning hole. The outer wall of the anchor rod is fitted with two nuts and a washer. The two nuts are located on the inner and outer sides of the first and second support profiles, respectively. The washer is placed on the outer side of the first and second support profiles and is located on the outer side of one of the nuts.

[0013] Specifically, the inner wall of the positioning hole has a stepped structure, and a nut is placed inside the positioning hole with one end fitting against the stepped surface of the positioning hole.

[0014] Specifically, the first support profile is a straight plate structure and is vertically distributed; the second support profile is an arc-shaped structure, and the first structure is symmetrically distributed with respect to the symmetrical plane at the center of the two first support profiles.

[0015] Specifically, each of the first and second support profiles in each group has six threaded holes, and each threaded hole is threaded with a threaded rod. The end of the threaded rod away from the protective net has an internal hexagonal groove.

[0016] Specifically, two adjacent first structures are parallel to each other, and a set of protective netting is laid on the outside of the two adjacent sets of first support profiles and the two adjacent sets of second support profiles of the two first structures. Three threaded rods are tied to each end of the protective netting.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. This utility model, through the cooperation of system anchor bolts, first support profiles, second support profiles, and protective nets, can achieve stable installation and fixation after the first and second support profiles are assembled with system anchor bolts. Thus, under the support of the first and second support profiles, the safety bearing effect of the tunnel is improved. At the same time, the setting of the protective net can be used in conjunction with high-pressure shotcrete for reinforcement, enhancing the adhesion of the concrete layer, thereby improving the overall safety of the support.

[0019] 2. This utility model uses the installation of system anchor bolts to change the mechanical state of the surrounding rock itself, forming an integral and stable rock zone around the tunnel. By utilizing the joint action of the anchor bolts and the surrounding rock, the stability of the tunnel is maintained. At the same time, the installation of the anchor bolts is carried out by multi-arm drilling rigs instead of manual labor, which greatly saves labor costs and improves support efficiency.

[0020] 3. This utility model, through the combination of a protective net and sprayed concrete, can fill the joints and cavities on the surface of the surrounding rock by high-speed spraying, greatly improving the strength of the surrounding rock. This filling effect not only enhances the stability of the surrounding rock but also prevents weathering and erosion from affecting it. At the same time, the overall structure of the protective net is small, making it easy to install and position, and it is more convenient and efficient than traditional steel anchor net construction. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall and partial structure of the present utility model;

[0022] Figure 2 This is a schematic diagram of the exploded structure of the first and second support profiles of this utility model;

[0023] Figure 3 This is a schematic diagram of the sectional structure of the anchor bolt axis of this utility model;

[0024] Figure 4 This is a schematic diagram of the connection structure of the protective net of this utility model.

[0025] In the diagram: 1. Anchor bolt; 11. Nut; 12. Washer; 2. First support profile; 3. Second support profile; 4. Protective net; 51. Positioning hole; 52. Threaded hole; 53. Threaded rod. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] 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 merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0031] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within 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.

[0032] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0033] like Figure 1 and 2 As shown in Figure 4, a support device for the construction of a water diversion tunnel in a hydropower station includes:

[0034] Anchor bolt 1; the outer wall of anchor bolt 1 is fitted with a nut 11 and a washer 12;

[0035] Two sets of first support profiles 2 and second support profiles 3 are spliced ​​together to form a first structure (generally a U-shaped structure) consistent with the tunnel cross section and supported on the inner wall of the tunnel. The first support profiles 2 and second support profiles 3 are integrally provided with positioning holes 51 and threaded holes 52. An anchor rod 1 passes through the positioning hole 51 and a threaded rod 53 is threadedly connected to the inside of the threaded hole 52.

[0036] The protective net 4 has its edge fastened to the end of the threaded rod 53 located outside the first support profile 2 and the second support profile 3. The splicing structure of this structure is simpler and more convenient to construct than the traditional structure. In particular, the installation of the spliced ​​protective net 4 is simpler than the traditional welded steel mesh construction process, and can provide timely support and protection for the construction tunnel.

[0037] In some embodiments, the protective netting 4 is installed through the outer walls of the two first structures.

[0038] like Figure 1-3 As shown, each set of the first support profile 2 and the second support profile 3 is connected to two sets of anchor rods 1. The first end of the anchor rod 1 is anchored in the surrounding rock, and the second end of the anchor rod 1 is inserted into the positioning hole 51. Two nuts 11 and washers 12 are fitted on the outer wall of the anchor rod 1. Both nuts are threaded into the anchor rod. The two nuts 11 are located on the inner and outer sides of the first support profile 2 and the second support profile 3, respectively. The washers 12 are placed on the outer side of the first support profile 2 and the second support profile 3, and are located on the outer side of one of the nuts 11. By installing and positioning the anchor rods 1 with the surrounding rock inside the tunnel, the surrounding rock is strengthened. At the same time, the auxiliary positioning of the first support profile 2 and the second support profile 3 is completed. The installation of the first support profile 2 and the second support profile 3 after splicing further enhances the support effect of the tunnel.

[0039] like Figure 3 As shown, the inner wall of the positioning hole 51 has a stepped structure. A nut is placed inside the positioning hole 51, with one end fitting against the stepped surface of the positioning hole 51. The anchor rod 1 and the first support profile 2, as well as the anchor rod 1 and the second support profile 3, are fastened together by the compression and positioning of the nut 11.

[0040] like Figure 1 and 2 As shown, the first support profile 2 is a straight plate structure and is vertically distributed; the second support profile 3 is an arc-shaped structure, and the first structure is symmetrically distributed with respect to the symmetrical plane at the center of the two first support profiles 2.

[0041] In some embodiments, adjacent first support profiles 2 and second support profiles 3, as well as two adjacent second support profiles 3, can be spliced ​​and positioned by metal angle brackets. The splicing structure can strengthen the support of the tunnel and provide good support for its local accidental collapse.

[0042] like Figure 1-4 As shown, each of the first support profile 2 and the second support profile 3 has six threaded holes 52, and each threaded hole 52 is threaded with a threaded rod 53. The end of the threaded rod 53 away from the protective net 4 has an internal hexagonal groove.

[0043] like Figure 1 and 2 As shown, two adjacent first structures are parallel to each other. A set of protective netting 4 is laid on the outside of two adjacent sets of first support profiles 2 and two adjacent sets of second support profiles 3 of the two first structures. Three threaded rods 53 are respectively fastened to both ends of the protective netting 4. Through the threaded connection between the threaded hole 52 and the threaded rod 53, the position of the threaded rod 53 can be adjusted so that the threaded rod 53 abuts against the inner wall of the tunnel, thereby achieving stable support for the first support profile 2 or the second support profile 3, avoiding tilting of the first support profile 2 and the second support profile 3 against the tunnel surface, thus improving the stability and firmness of the installation of the first support profile 2 and the second support profile 3, and preventing the first support profile 2 or the second support profile 3 from tilting due to unevenness of the tunnel surface. By fastening and positioning the protective net 4 with the threaded rod 53, the protective net 4 comes into contact with the tunnel surface, protecting the tunnel surface while facilitating its interaction with the concrete, further improving the support performance of the device and reducing the generation of small falling rocks. The protective net 4 is a metal woven mesh, which enhances its protective performance.

[0044] Working principle: First, a multi-arm drilling rig drills holes inside the tunnel. Then, anchor bolts 1 are installed inside the drill holes. Next, the first support profile 2 and the second support profile 3 are installed outside the anchor bolts 1. The first support profile 2 and the second support profile 3 are spliced ​​and positioned simultaneously during installation. Finally, after the protective net 4 is tightened, the threaded rod 53 is adjusted so that it abuts against the tunnel surface, and concrete spraying can then be carried out. After the concrete layer solidifies, the tunnel is supported and protected.

[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A support device for construction of a water diversion tunnel of a hydroelectric power station, characterized by: include: Anchor bolt (1); the outer wall of the anchor bolt (1) is fitted with a nut (11) and a washer (12); Two sets of first support profiles (2) and second support profiles (3) are spliced ​​together to form a first structure consistent with the tunnel cross section and supported on the inner wall of the tunnel. The first support profile (2) and the second support profile (3) are integrally provided with positioning holes (51) and threaded holes (52). An anchor rod (1) passes through the inside of the positioning hole (51), and a threaded rod (53) is threaded inside the threaded hole (52). The edge of the protective net (4) is fastened to the end of the threaded rod (53) located outside the first support profile (2) and the second support profile (3).

2. A support device for the construction of a water diversion tunnel of a hydroelectric power plant according to claim 1, characterized in that: Each set of the first support profile (2) and the second support profile (3) is connected to two sets of anchor rods (1). The first end of the anchor rod (1) is anchored in the surrounding rock, and the second end of the anchor rod (1) is inserted into the positioning hole (51). The outer wall of the anchor rod (1) is fitted with two nuts (11) and a washer (12). The two nuts (11) are located on the inner and outer sides of the first support profile (2) and the second support profile (3), respectively. The washer (12) is placed on the outer side of the first support profile (2) and the second support profile (3), and is located on the outer side of a nut (11).

3. The support device for the construction of a water diversion tunnel of a hydropower station according to claim 2, characterized in that: The inner wall of the positioning hole (51) has a stepped structure, and a nut is placed inside the positioning hole (51) with one end fitting against the stepped surface of the positioning hole (51).

4. The support device for the construction of a water diversion tunnel of a hydropower station according to claim 1, characterized in that: The first support profile (2) is a straight plate structure and is vertically distributed; the second support profile (3) is an arc-shaped structure, and the first structure is symmetrically distributed with respect to the symmetrical plane at the center of the two first support profiles (2).

5. The support device for the construction of a water diversion tunnel of a hydroelectric power station according to claim 1, characterized in that: Each of the first support profile (2) and the second support profile (3) in each group has six threaded holes (52), and each threaded hole (52) is threaded with a threaded rod (53). The end of the threaded rod (53) away from the protective net (4) has an internal hexagonal groove.

6. A support device for the construction of a water diversion tunnel of a hydroelectric power plant according to claim 5, characterized in that: Two adjacent first structures are parallel to each other. A set of protective nets (4) is laid on the outside of the two adjacent sets of first support profiles (2) and the two adjacent sets of second support profiles (3) of the two first structures. Three threaded rods (53) are tied to the two ends of the protective nets (4).

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