Tunnel cable trench RPC cover plate capable of preventing brittle failure

Abstract

The utility model discloses a tunnel cable trench RPC cover plate capable of preventing brittle failure, which comprises a cover plate body, an anti-brittle fault layer is arranged in the cover plate body, and the anti-brittle fault layer and the cover plate body are integrally formed; according to the utility model, the ductility of the cover plate after fracture can be increased, so that the cover plate can be slowly broken after cracking, the response time of people is prolonged, and the occurrence of people injury events is reduced.

Description

Technical Field

[0001] The utility model relates to an RPC cover plate for a tunnel cable trench which can prevent brittle fracture and belongs to the technical field of RPC cover plates for tunnel cable trenches. Background Art

[0002] Tunnel cable trench RPC cover has been widely used in highway tunnels. Tunnel cable trench RPC cover has replaced reinforced concrete cover with its advantages of light weight, easy transportation and installation. Under the condition of quality assurance, the compressive strength of RPC cover material can reach 130-200Mpa, the flexural strength of material can reach 16-25Mpa, and the flexural strength can reach 3-6kN. RPC cover is generally made of reactive powder concrete (RPC) material, which is composed of highly active composite admixtures, cement, quartz sand, etc., and is prepared by high-temperature heat sealing and other processes. In order to increase its flexural performance, some RPC covers will add steel fiber or polymer fiber materials. The addition of steel fiber and polymer fiber can indeed improve the flexural strength of RPC cover to a certain extent, but RPC cover is generally thin, generally 2.5-3cm thick, which makes the distribution of steel fiber and polymer fiber in the cover very uneven, and also seriously affects the flexural strength of RPC cover. When people pass through the cover, there will be a safety hazard of brittle fracture of the cover.

[0003] That is, there is a need for a tunnel cable trench RPC cover plate that can prevent brittle fracture and increase the post-fracture ductility of the cover plate, so that the cover plate can be slowly disconnected after cracking, thereby extending people's reaction time and reducing the occurrence of injury incidents. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a tunnel cable trench RPC cover that prevents brittle fracture, which can increase the post-fracture ductility of the cover so that the cover can slowly break after cracking, thereby extending people's reaction time and reducing the occurrence of injury incidents; it can overcome the shortcomings of the existing technology.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] The utility model discloses a tunnel cable trench RPC cover plate for preventing brittle fracture, which comprises a cover plate body. An anti-brittle fracture layer is arranged in the cover plate body, and the anti-brittle fracture layer is integrally formed with the cover plate body.

[0007] The above-mentioned brittle fault prevention layer is a steel mesh composed of transverse steel bars and longitudinal steel bars arranged in the cover plate body.

[0008] The above-mentioned brittle fault prevention layer is a transverse vertical piece and a longitudinal vertical piece provided in the cover plate body, and mutually matching slots are provided at the staggered positions of the transverse vertical piece and the longitudinal vertical piece, and the transverse vertical piece and the longitudinal vertical piece are buckled with each other through the slots.

[0009] The aforementioned brittle fault prevention layer is a combination of transverse vertical plates, longitudinal vertical plates and steel mesh provided in the cover plate body.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] 1. The utility model can avoid brittle fracture when the cover plate body breaks through the anti-brittle fracture layer, giving people reaction time, thereby reducing the occurrence of injury incidents.

[0012] 2. The first solution to prevent brittle fracture is to provide a steel mesh composed of transverse steel bars and longitudinal steel bars in the cover body. Compared with the existing technology, the steel mesh can prevent brittle fracture and increase the post-fracture ductility of the cover body, so that the cover body can slowly break after cracking, thereby extending people's reaction time.

[0013] 3. The second scheme for preventing brittle faults is that the anti-brittle faults are transverse vertical sheets and longitudinal vertical sheets provided in the cover body, and mutually cooperating slots are provided at the staggered positions of the transverse vertical sheets and the longitudinal vertical sheets, and the transverse vertical sheets and the longitudinal vertical sheets are interlocked with each other through the slots. Because the cover body is relatively thin, there is a risk of the cover body breaking and folding when stepped on, and the steel bars in the embodiment only serve to delay the fracture, and the risk of a single-layer steel mesh being folded is relatively large. Therefore, the transverse vertical sheets and the longitudinal vertical sheets are staggered and fixed to play the role of a rectangular support in the middle of the cover body. Firstly, the rectangular support is conducive to improving the overall fracture resistance of the cover body. Secondly, because of the rectangular support in the middle, it will have a higher post-fracture ductility when it breaks, further improving safety, that is, having a higher fracture resistance.

[0014] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings, in which:

[0016] Figure 1 This is a schematic diagram of the connection structure of the first solution of the utility model.

[0017] Figure 2 It is a perspective structural diagram of the first solution of the utility model.

[0018] Figure 3 This is a schematic diagram of the split structure of the first solution of the utility model.

[0019] Figure 4 It is a perspective structural diagram of the second solution of the utility model.

[0020] Figure 5 This is a schematic diagram of the split structure of the second solution of the utility model.

[0021] Figure 6 This is a schematic diagram of the connection structure of the anti-brittle fault layer of the second scheme of the utility model.

[0022] Figure 7 for Figure 6 Schematic diagram of the enlarged structure of part A.

[0023] Among them, the cover plate body 1; the anti-brittle fault layer 2; the transverse steel bars 3; the longitudinal steel bars 4; the transverse vertical pieces 5; the longitudinal vertical pieces 6; and the slots 7. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, rather than for limiting the protection scope of the present invention.

[0025] Example 1

[0026] like Figure 1-Figure 3 As shown, the utility model discloses a RPC cover plate for preventing brittle fracture of a tunnel cable trench, which includes a cover plate body 1, in which an anti-brittle fracture layer 2 is arranged, and the anti-brittle fracture layer 2 is integrally formed with the cover plate body 1, wherein the cover plate body 1 adopts active powder concrete (RPC) material, which is composed of highly active composite admixtures, cement, quartz sand, etc. During casting, the anti-brittle fracture layer 2 is pre-installed, and then integrally cast and formed. Such a structure can avoid brittle fracture through the anti-brittle fracture layer 2 when the cover plate body 1 breaks, giving people reaction time, thereby reducing the occurrence of injury incidents.

[0027] The first solution for preventing the brittle fault layer 2 is to provide a steel mesh composed of transverse steel bars 3 and longitudinal steel bars 4 in the cover body 1. Compared with the prior art, the steel mesh can prevent brittle fracture and increase the post-fracture ductility of the cover body 1, so that the cover body 1 can slowly break after cracking, thereby extending people's reaction time.

[0028] Example 2

[0029] like Figure 4-Figure 7As shown, the second scheme of the anti-brittle fault layer 2 is a transverse vertical sheet 5 and a longitudinal vertical sheet 6 provided in the cover body 1, and mutually matching grooves 7 are provided at the staggered positions of the transverse vertical sheet 5 and the longitudinal vertical sheet 6, and the transverse vertical sheet 5 and the longitudinal vertical sheet 6 are interlocked with each other through the grooves 7. Because the cover body 1 is relatively thin, there is a risk of the cover body 1 breaking and folding when stepped on, and the steel bars in Example 1 only serve the purpose of delaying the fracture, and the risk of a single-layer steel mesh being folded is relatively large. Therefore, the transverse vertical sheet 5 and the longitudinal vertical sheet 6 are staggered and fixed to play the role of a rectangular support in the middle of the cover body 1. Firstly, the rectangular support is conducive to improving the overall fracture resistance of the cover body 1. Secondly, because of the rectangular support in the middle, it will have a higher fracture ductility when it breaks, further improving safety, that is, having a higher fracture resistance.

[0030] Example 3

[0031] This embodiment is a combination of embodiment 1 and the solution of embodiment 1, which can achieve both brittle fracture prevention and folding resistance.

[0032] The above is only a preferred embodiment of the utility model, and does not limit the confidentiality of the utility model in any form. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still falls within the scope of the technical solution of the utility model.

Claims

1. A tunnel cable trench RPC cover plate for preventing brittle fracture, comprising a cover plate body (1), characterized in that: An anti-brittle fracture layer (2) is provided in the cover plate body (1); the anti-brittle fracture layer (2) and the cover plate body (1) are integrally formed.

2. The RPC cover plate for preventing brittle fracture of a tunnel cable trench according to claim 1 is characterized in that: The brittle fault prevention layer (2) is a steel mesh composed of transverse steel bars (3) and longitudinal steel bars (4) arranged in the cover plate body (1).

3. The RPC cover plate for preventing brittle fracture of a tunnel cable trench according to claim 1 is characterized in that: The anti-brittle fault layer (2) is a transverse vertical piece (5) and a longitudinal vertical piece (6) provided in the cover plate body (1), and mutually matching clamping grooves (7) are provided at the staggered positions of the transverse vertical piece (5) and the longitudinal vertical piece (6), and the transverse vertical piece (5) and the longitudinal vertical piece (6) are mutually buckled through the clamping grooves (7).

4. The RPC cover plate for preventing brittle fracture of a tunnel cable trench according to claim 3 is characterized in that: The brittle fault prevention layer (2) is a combination of a transverse vertical piece (5), a longitudinal vertical piece (6) and a steel mesh provided in the cover plate body (1).

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