Combined blocking structure for preventing flying stones during tunnel portal blasting

Abstract

The embodiment of the utility model provides a flying stone prevention combined type blocking structure for tunnel portal blasting, and relates to the technical field of tunnel construction. The tunnel portal blasting flying stone prevention combined type partition structure comprises an anti-explosion layer, a partition layer and a protection layer, the anti-explosion layer comprises a first supporting frame and a flexible anti-explosion piece, the first supporting frame is arranged at a tunnel portal, and the flexible anti-explosion piece is arranged on the first supporting frame; the blocking layer comprises a second supporting frame and a blocking piece, the second supporting frame is arranged on the side, away from the tunnel portal, of the first supporting frame, and the blocking piece is arranged on the second supporting frame; the protective layer comprises a third supporting frame and a protective net, the third supporting frame is arranged on the side, away from the tunnel portal, of the first supporting frame, and the protective net is arranged on the third supporting frame. The combined type blocking structure for preventing the flying stones in the tunnel portal blasting has the effect of reducing the harm of the flying stones in the tunnel blasting process.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tunnel construction technical field, specifically, relate to a kind of tunnel portal blasting flyrock combined type blocking structure. BACKGROUND

[0002] After tunnel portal pipe roof construction is completed, excavation blasting is needed to facilitate tunnel construction, however, when there are temporary buildings and structures around the tunnel, the flyrock after blasting can cause great damage to the temporary buildings and structures at the tunnel portal. Currently, there is a lack of effective measures to prevent flyrock from causing damage during blasting construction.

[0003] Therefore, in order to reduce the damage caused by flyrock during tunnel blasting, there is an urgent need for an effective tunnel portal blasting flyrock combined type blocking structure. SUMMARY

[0004] The utility model aims to provide a tunnel portal blasting flyrock combined type blocking structure that can reduce the damage caused by flyrock during tunnel blasting.

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

[0006] In a first aspect, the utility model provides a tunnel portal blasting flyrock combined type blocking structure, comprising:

[0007] The explosion-proof layer includes a first support frame and a flexible explosion-proof component. The first support frame is arranged at the tunnel portal. The flexible explosion-proof component is arranged on the first support frame.

[0008] The blocking layer includes a second support frame and a blocking component. The second support frame is arranged on the side of the first support frame away from the tunnel portal. The blocking component is arranged on the second support frame and is used to block flyrock that breaks through the explosion-proof layer.

[0009] The protective layer includes a third support frame and a protective net. The third support frame is arranged on the side of the first support frame away from the tunnel portal. The protective net is arranged on the third support frame to protect temporary buildings or equipment outside the tunnel portal.

[0010] In an optional embodiment, the first support frame has a workbench arranged on the side and top.

[0011] In an optional embodiment, the blocking component includes a steel pipe frame and a bamboo net. The steel pipe frame is arranged on the second support frame. The bamboo net is arranged on the steel pipe frame.

[0012] In an optional embodiment, the side of the bamboo net facing the tunnel portal is also provided with a flexible explosion-proof component.

[0013] In an optional embodiment, a reinforcing diagonal brace is arranged between the steel pipe frame and the second support frame.

[0014] In an optional embodiment, the coverage areas of the first support frame, the second support frame and the third support frame gradually increase.

[0015] In an optional embodiment, the spacing between the explosion-proof layer, the barrier layer and the protective layer is adjustable.

[0016] In an optional embodiment, the flexible explosion-proof member comprises a gunny sack.

[0017] In an optional embodiment, the first support frame and the second support frame are both I-beam skeletons, and the third support frame is a steel pipe frame.

[0018] In an optional embodiment, the protective net is a tinned iron net.

[0019] The beneficial effects of the tunnel portal blasting anti-flying stone combined barrier structure provided by the embodiments of the present application include:

[0020] By arranging the three-layer combined barrier structure of the explosion-proof layer, the barrier layer and the protective layer at the tunnel portal, the effect of weakening the potential energy layer by layer during tunnel blasting is achieved, the harm of flying stones during tunnel blasting is reduced, and the problem of damaging temporary buildings, structures and construction equipment safety due to flying stone impact during traditional tunnel blasting is overcome. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical schemes of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained from these drawings without creative labor.

[0022] Figure 1 The installation position schematic diagram of a tunnel portal blasting anti-flying stone combined barrier structure provided by the present embodiment;

[0023] Figure 2 The structure schematic diagram of an explosion-proof layer provided by the present embodiment;

[0024] Figure 3 The structure schematic diagram of a barrier layer provided by the present embodiment;

[0025] Figure 4 The structure schematic diagram of a protective layer provided by the present embodiment.

[0026] Icon: 100 - explosion-proof layer; 110 - first support frame; 120 - flexible explosion-proof member; 130 - workbench; 200 - barrier layer; 210 - second support frame; 220 - barrier member; 221 - steel pipe frame; 222 - bamboo net; 230 - reinforcing diagonal brace; 300 - protection layer; 310 - third support frame; 320 - protection net. DETAILED DESCRIPTION

[0027] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application 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 application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0029] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0031] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0033] After the tunnel arch is poured, the tunnel is excavated and blasted, but there are temporary buildings, structures or construction equipment around the tunnel, and the flying stones produced during blasting are harmful to the temporary buildings, structures or construction equipment. At present, in order to reduce the harm of flying stones during blasting, the cannon is directly suspended and fixed to the arch, but the flying stones are often shaken out together with the cannon, and the flying stones produced during blasting cannot be effectively blocked.

[0034] In view of the above technical problems, the utility model provides a tunnel portal blasting anti-flying stone combined blocking structure for effectively blocking the flying stones produced during tunnel portal blasting to reduce the harm of flying stones during tunnel blasting.

[0035] The overall structure, working principle and technical effects of the tunnel portal blasting anti-flying stone combined blocking structure are described in detail below by combining with the drawings.

[0036] Please refer to Figure 1 - Figure 4 A tunnel portal blasting anti-flying stone combined blocking structure comprises an explosion-proof layer 100, a blocking layer 200 and a protective layer 300, and the explosion-proof layer 100, the blocking layer 200 and the protective layer 300 are sequentially arranged from near to far outside the tunnel portal. The explosion-proof layer 100 comprises a first support frame 110 and a flexible explosion-proof piece 120, the first support frame 110 is fixedly installed outside the tunnel portal, the first support frame 110 provides an installation carrier for the flexible explosion-proof layer 100, the flexible explosion-proof layer 100 is arranged on the side of the first support frame 110 facing the tunnel portal, and the flexible explosion-proof layer 100 blocks the shock wave produced during tunnel blasting and blocks the flying stones produced during blasting. The blocking layer 200 comprises a second support frame 210 and a blocking piece 220, the second support frame 210 is located on the two sides of the first support frame 110 with respect to the tunnel portal, the second support frame 210 provides an installation carrier for the blocking piece 220, the blocking piece 220 is installed on the side of the second support frame 210 facing the first support frame 110, and the blocking piece 220 is used for blocking the flying stones that break through the explosion-proof layer 100. The protective layer 300 comprises a third support frame 310 and a protective net 320, the third support frame 310 is arranged on the side of the second support frame 210 away from the first support frame 110, and the third support frame 310 is arranged in front of the temporary buildings, structures or construction equipment located directly in front of the tunnel portal, the third support frame 310 provides an installation carrier for the protective net 320, and the protective net 320 is installed on the side of the third support frame 310 facing the second support frame 210, so as to block the flying stones that break through the explosion-proof layer 100 and the blocking layer 200, and avoid damaging the temporary buildings, structures or construction equipment in the construction site.

[0037] The three-layer combined blocking structure of the explosion-proof layer 100, the blocking layer 200 and the protection layer 300 is arranged at the tunnel opening, so as to weaken the potential energy of the tunnel explosion layer by layer, reduce the damage of the flying stones during the tunnel explosion, and overcome the problems of the traditional tunnel explosion, such as the damage to the temporary building, the structure and the safety of the construction equipment caused by the impact of the flying stones.

[0038] Please refer to Figure 2 In some optional embodiments, the first support frame 110 is a frame structure formed by overlapping I-beam skeletons, and in order to improve the structural stability of the explosion-proof layer 100, the first support frame 110 can also be fixed by anchor rods, anchor bolts and other structures. Further, in order to facilitate the construction work of workers, a workbench 130 is arranged on the side and top of the first support frame 110, and the workbench 130 is also made of I-beam and reinforced mesh.

[0039] Please refer to Figure 3 In some optional embodiments, the second support frame 210 is also a frame structure formed by overlapping I-beam skeletons, and the blocking piece 220 includes a steel pipe frame 221 and a bamboo net 222. The steel pipe frame 221 is installed on the side of the second support frame 210 facing the tunnel opening, and the steel pipe frame 221 is used to encrypt the second support frame 210 to block the larger gaps on the second support frame 210. The bamboo net 222 is installed on the side of the steel pipe frame 221 facing the tunnel opening, and the bamboo net 222 is made of overlapping bamboo strips. The gaps of the second support frame 210 are further blocked by the bamboo net 222 to improve the blocking effect of the blocking layer 200 on the flying stones. Further, the flexible explosion-proof piece 120 is also installed on the side of the bamboo net 222 facing the tunnel opening, which further weakens the potential energy of the tunnel explosion and reduces the impact of the flying stones. The flying stones generated by the explosion impact on the blocking layer 200 after breaking through the explosion-proof layer 100. At this time, the flexible explosion-proof piece 120 on the blocking layer 200 plays a role in weakening the explosion potential and blocking the flying stones, and the steel pipe frame 221 and the bamboo net 222 support the impacted flexible explosion-proof piece 120 to improve the blocking effect of the flying stones.

[0040] Further, in order to improve the overall structural stability of the blocking layer 200, a reinforcing diagonal brace 230 is arranged between the steel pipe frame 221 and the second support frame 210 to improve the connection stability between the steel pipe frame 221 and the second support frame 210.

[0041] Please refer to Figure 4In some optional embodiments, the third support frame 310 is a steel pipe frame, which is erected between the temporary building, structure or construction equipment facing the tunnel portal, and the protective net 320 is fixedly arranged on the steel pipe frame to protect the temporary building, structure or construction equipment. In order to make the third support frame 310 stable in structure, the bottom of the third support frame 310 is buried underground with a buried depth not less than 80 cm. In the embodiment, the protective net 320 adopts a tinned iron net to prevent the iron net from rusting and prolong the service life of the iron net. Meanwhile, combined with the fact that the protective net 320 is arranged on the third support frame 310, the protective net 320 can be conveniently replaced and maintained. Figure 4 When the protective layer 300 is arranged in front of the temporary building or structure, a notch corresponding to the door of the temporary building or structure is formed on the protective layer 300 to facilitate the workers to enter and exit.

[0042] Please refer to Figure 1 Figure 3 In some optional embodiments, the flexible anti-explosion member 120 includes a gunny sack, which is generally woven by waste tires and can effectively reduce the blasting shock wave and block the splashes.

[0043] Please refer to Figure 1 In order to make the anti-explosion layer 100, the barrier layer 200 and the protective layer 300 have good protective effect on the tunnel portal blasting, in some optional embodiments, the coverage areas of the first support frame 110, the second support frame 210 and the third support frame 310 gradually increase, that is, the projections of the first support frame 110, the second support frame 210 and the third support frame 310 on the tunnel portal section surface gradually increase, and in particular, the coverage area of the third support frame 310 needs to be greater than the projection area of the temporary building, structure or construction equipment to be protected on the tunnel portal section surface. Thus, the flying stones generated by the tunnel blasting can be effectively blocked. Further, the spacing between the anti-explosion layer 100, the barrier layer 200 and the protective layer 300 is adjustable. According to the actual construction environment and the floor area of the first support frame 110 and the second support frame 210, the preset spacing between the anti-explosion layer 100, the barrier layer 200 and the protective layer 300 is selected, and the anti-explosion layer 100, the barrier layer 200 and the protective layer 300 are installed to the preset positions.

[0044] In summary, the implementation principle of the tunnel portal blasting anti-flying stone combined barrier structure provided by the utility model is that the three-layer combined barrier structure of the anti-explosion layer 100, the barrier layer 200 and the protective layer 300 is arranged at the tunnel portal to realize the effect of weakening the potential energy layer by layer during the tunnel blasting, reduce the harm of the flying stones during the tunnel blasting, and overcome the problem of the safety of the temporary building, structure and construction equipment damaged by the flying stones during the traditional tunnel blasting.

[0045] ​The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A combined barrier structure for preventing flying rocks in a tunnel portal blasting, characterized in that, The utility model relates to a tunnel entrance protection device, comprising: an explosion-proof layer including a first support frame arranged at the tunnel entrance and a flexible explosion-proof member arranged on the first support frame; a barrier layer including a second support frame arranged on the side of the first support frame away from the tunnel entrance and a barrier member arranged on the second support frame for blocking flying stones that break through the explosion-proof layer; a protective layer including a third support frame arranged on the side of the first support frame away from the tunnel entrance and a protective net arranged on the third support frame for protecting temporary buildings or equipment outside the tunnel entrance.

2. The combined blocking structure for preventing flying stones in tunnel portal blasting according to claim 1, characterized in that, The first support frame is provided with a workbench on the side and top thereof.

3. The combined blocking structure for preventing flying stones in tunnel portal blasting according to claim 1, characterized in that, The barrier member includes a steel pipe frame arranged on the second support frame and a bamboo net arranged on the steel pipe frame.

4. The combined blocking structure for preventing flying stones in tunnel portal blasting according to claim 3, characterized in that, The side of the bamboo net facing the tunnel entrance is also provided with a flexible explosion-proof member.

5. The combined blocking structure for preventing flying stones in tunnel portal blasting according to claim 3, characterized in that, A reinforcing diagonal brace is arranged between the steel pipe frame and the second support frame.

6. The combined blocking structure for preventing flying rocks in tunnel portal blasting according to claim 1, characterized in that, The coverage areas of the first support frame, the second support frame and the third support frame gradually increase.

7. The combined blocking structure for preventing flying stones in tunnel portal blasting according to claim 1, characterized in that, The distances between the explosion-proof layer, the barrier layer and the protective layer are adjustable.

8. A combined blocking structure for preventing flying rocks in a tunnel portal blasting according to any one of claims 1 to 7, characterized in that, The flexible explosion-proof member includes a gun shield.

9. A combined blocking structure for preventing flying rocks in tunnel portal blasting according to any one of claims 1 to 7, characterized in that, The first support frame and the second support frame are both I-beam skeletons, and the third support frame is a steel pipe frame.

10. A combined blocking structure for preventing flying rocks in tunnel portal blasting according to any one of claims 1 to 7, characterized in that, The protective net is a tinned iron net.

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