Safety fence with anti-collision energy dissipation function for major civil engineering site

Abstract

The application discloses a safety fence with anti-collision and energy dissipation functions for major civil engineering sites, each two vertical protection rods (1) are arranged with a protection panel (2), a plurality of concave buckles (11) are arranged on the side of the vertical protection rod (1), a plurality of convex buckles (24) are arranged on the side of the protection panel (2), a groove (111) matched with the convex buckle (24) in size is formed on the concave buckle (11), and the convex buckle (24) is inserted into the groove (111); the protection panel (2) is composed of a first protection layer (21), a second protection layer (22) and a third protection layer (23) which are sequentially stacked and combined to form a multi-stage anti-collision structure; the first protection layer (21) is located at a reverse position of civil engineering and is composed of a plurality of negative Poisson ratio unit bodies (211); the second protection layer (22) is an intermediate interlayer formed of damping material. The first protection layer (21) and the second protection layer (22) can absorb most of external force, and the third protection layer (23) serves as a safety reserve to cope with greater impact load, so that effective safety guarantee is provided for major engineering projects.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of safety protection in civil engineering construction, and particularly relates to a site safety fence with anti-collision and energy dissipation functions used in major civil engineering project construction. BACKGROUND

[0002] In the process of civil engineering construction, in order to improve the safety of the project, a site safety fence needs to be set up. For the construction of major civil engineering projects, especially projects located in urban areas, how to reduce the impact on the surrounding environment should also be considered. Therefore, the structure and construction of the safety fence are further required to be improved.

[0003] A building fence for civil construction is disclosed in Chinese patent No. 202320226087.9, which connects the support column, horizontal rod and vertical rod to form a building fence that is telescopic and convenient to disassemble and install. However, the problem is that the structure of this building fence has low strength and cannot withstand large external forces, so it has little safety protection effect. In addition, in the urban dense building area, when deep foundation pit engineering is constructed (such as subway station foundation pit), the external force generated by factors such as accidental collision of vehicles outside the construction area should also be considered to produce various safety hazards to the project construction, and the above-mentioned Chinese patent cannot meet the construction requirements of major projects.

[0004] In order to improve the impact resistance of the safety fence, Chinese patent No. CN201721327302.5 discloses a bridge impact-resistant fence, which comprises a stand, a horizontal rod, a corrugated steel plate and a fixed plate. The outer and inner sides of the stand are concave inward and arc-shaped, the upper part of the stand is provided with a sleeve joint hole, and the middle part of the stand is provided with two fixed holes, of which the fixed hole is semicircular; the bottom of the stand is a buried part. The corrugated steel plate is installed at the edge of the upper part of the stand. The horizontal rod is provided with three rows, which are sleeved in the sleeve joint hole and the fixed hole of the stand, and the horizontal rod is composed of a pre-arch section and a straight section, of which the straight section is sleeved with the stand. The fixed plate is installed on the upper side of the buried part of the stand and is welded. The stand is arc-shaped as a whole, which can prevent the vehicle from jumping over the stand. The horizontal rod is provided with a pre-arch section, which can withstand a large load and has a good force transmission effect; the three horizontal rods sleeved on the stand form two protection channels, the first one is the horizontal rod at the fixed hole, and the second one is the horizontal rod on the sleeve joint hole, which makes the fence as a whole more secure. However, the bridge impact-resistant fence is still a rigid connection structure without compression and buffering structure, and it cannot absorb impact energy, so its impact resistance to heavy trucks is limited.

[0005] Therefore, in view of the above actual engineering problems, it is urgent to develop, design and apply a site safety fence with anti-collision and energy dissipation functions used in major civil engineering projects. SUMMARY

[0006] The present application aims to overcome the defects of the prior art, such as low structural strength, small external force bearing capacity, low external impact resistance and poor safety protection performance, and to provide a safety fence with anti-collision and energy dissipation functions for major civil engineering sites, thereby providing effective safety protection for major engineering projects.

[0007] To achieve the above-mentioned object of the present application, the safety fence with anti-collision and energy dissipation functions for major civil engineering sites adopts the following technical scheme:

[0008] The safety fence with anti-collision and energy dissipation functions for major civil engineering sites comprises vertical protective rods and protective panels, one protective panel is arranged between every two vertical protective rods, the vertical protective rods are fixed to the ground, and the height of the vertical protective rods is higher than that of the protective panels, characterized in that: a plurality of concave buckles are arranged on the side edges of the vertical protective rods, a plurality of convex buckles are arranged on the side edges of the protective panels, a groove matching the size of the convex buckle is formed on the concave buckle, and the convex buckle is inserted into the groove; the protective panel is composed of a first protective layer, a second protective layer and a third protective layer, which are sequentially stacked and combined to form a multi-stage anti-collision structure, and each protective layer is an independent structure and can be detached and replaced; the first protective layer is located at the reverse position of the civil engineering and is composed of a plurality of negative Poisson's ratio unit bodies, the negative Poisson's ratio unit bodies shrink under pressure to absorb part of the impact energy and reduce the safety hazards caused by external impact forces; the second protective layer is an intermediate layer made of damping material, the damping material is epoxy resin, polyurethane or other similar materials, and the impact force can be further reduced; the third protective layer is composed of a plurality of energy absorption boxes, the shell material of the energy absorption box is plastic material and will not be brittlely damaged; the energy absorption box is arranged at the same position as the negative Poisson's ratio unit body; springs are arranged inside the energy absorption box perpendicular to the vertical action surface direction, and the third protective layer realizes the last stage of protection through the plastic plate and the springs; the energy absorption box is in a variable cross-section form and has an upper narrow and lower wide structure, the narrow surface faces outward, and the wide surface is close to the side of the civil engineering, forming a structure form that combines stress transmission and diffusion.

[0009] Preferably, the lateral width of the vertical protective rod is greater than the thickness of the protective panel, a reflective strip is arranged on the vertical protective rod to improve the night recognition, the distance between the vertical protective rods is not greater than 2m, and the height of the vertical protective rod is 1.0m-1.2m.

[0010] Preferably, a bolt hole and a screw hole are respectively formed at the same position of the concave buckle and the convex buckle, a thread is arranged on the side wall of the screw hole, the concave buckle and the convex buckle are connected through a screw rod, and the vertical protective rod and the protective panel are connected into a whole.

[0011] Preferably, the negative Poisson's ratio unit body is arranged in a plum blossom type, and the energy absorption box is arranged at the same position as the negative Poisson's ratio unit body.

[0012] Preferably, the first protective layer and the third protective layer have the same thickness, and the thickness is not less than 50 mm; the thickness of the second protective layer is less than that of the first protective layer and the third protective layer, but not less than 20 mm.

[0013] Preferably, the diameter of the spring is not less than 20 mm, and the material of the spring is steel.

[0014] Preferably, the length-width ratio of the cross section of the energy absorption box is 1.5:(0.9-1.1), and the thickness of the energy absorption box is 28-33 mm.

[0015] Further, the first protective layer and the third protective layer have the same thickness, and the thickness is 50-80 mm; the thickness of the second protective layer is 25-45 mm; the diameter of the spring is 25-50 mm, and the material of the spring is steel; the length-width ratio of the cross section of the energy absorption box is 1.5:(0.9-1.1), and the thickness of the energy absorption box is 29-32 mm.

[0016] The safety protective fence with the anti-collision and energy absorption functions for a major civil engineering site has the following beneficial effects after adopting the above technical solutions:

[0017] (1) The protective panel is composed of three protective layers, which can bear the external impact load step by step to realize the anti-collision effect, and can provide effective safety protection for major engineering projects. Specifically, the first protective layer shrinks under pressure due to the structural advantages of the negative Poisson's ratio unit, the second protective layer is filled with damping material to further reduce the impact force, and the third protective layer is provided with an energy absorption box to realize the last level of protection through a plastic plate and a spring.

[0018] (2) The connection between the vertical protective rod and the protective panel is connected through a concave buckle and a convex buckle, and the connection form is similar to a mortise and tenon structure, which is simple in structure, excellent in connection effect and convenient to operate. At the same time, the overall structure is unitized, which is convenient for disassembly, transportation and partial replacement.

[0019] (3) The protective panel is the most important part of the overall structure, and the three protective layers are independent structures, which can be replaced locally when partially damaged. The site safety protective fence in the application can be used repeatedly.

[0020] (4) The energy absorption box adopts a variable cross-section form, and the overall structure is narrow on the outside and wide on the inside, with the narrow side facing outward and the wide side close to the civil engineering side, forming a structure form that can transfer and diffuse stress.

[0021] (5) Through accurate calculation, optimization design and test verification, the overall structure parameters and internal structure parameters of the optimized first protective layer, second protective layer and third protective layer are obtained, and appropriate structure materials are selected, so that the impact resistance and manufacturing cost of the safety protective fence for the site are comprehensively optimal. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a whole structure schematic diagram of the safety protective fence for the major civil engineering site with the anti-collision energy dissipation function.

[0023] Figure 2 is a protective panel cross-section structure schematic diagram adopted by the safety protective fence for the major civil engineering site with the anti-collision energy dissipation function.

[0024] Figure 3 is a vertical protective rod and protective panel connection mode schematic diagram of the safety protective fence for the major civil engineering site with the anti-collision energy dissipation function.

[0025] The figure mark is: 1-vertical protective rod; 11-concave buckle; 111-groove; 112-peg hole; 2-protective panel; 21-first protective layer; 211-negative Poisson ratio unit body; 22-second protective layer; 23-third protective layer; 231-energy absorption box; 2311-spring; 24-convex buckle; 241-screw hole; 242-screw thread. DETAILED DESCRIPTION

[0026] In order to further describe the present application, the safety protective fence for the major civil engineering site with the anti-collision energy dissipation function will be described in more detail below in combination with the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

[0027] As shown in the whole structure schematic diagram of the safety protective fence for the major civil engineering site with the anti-collision energy dissipation function, Figure 1 It can be seen from the whole structure schematic diagram of the safety protective fence for the major civil engineering site with the anti-collision energy dissipation function that the safety protective fence for the major civil engineering site with the anti-collision energy dissipation function includes vertical protective rods 1 and protective panels 2. One protective panel 2 is arranged between every two vertical protective rods 1, the vertical protective rods 1 are fixed to the ground and have a height higher than that of the protective panels 2, the side width of the vertical protective rods 1 is greater than that of the protective panels 2, and the formed complete safety protective fence is a staggered structure. Reflective strips can be arranged on the vertical protective rods 1, so that the safety protective fence of the present application can be further easily distinguished.

[0028] As shown in the whole structure schematic diagram of the safety protective fence for the major civil engineering site with the anti-collision energy dissipation function, Figure 2The application is a safety fence for major civil engineering sites with anti-collision and energy dissipation functions Figure 1 As shown, the protective panel 2 is composed of a first protective layer 21, a second protective layer 22 and a third protective layer 23 arranged in sequence, wherein the first protective layer 21 is located away from the engineering construction project and is composed of a plurality of negative Poisson's ratio unit bodies 211 which can absorb part of external force when they contract in structure under pressure. The planar arrangement of the negative Poisson's ratio unit bodies 211 is preferably a quincunx arrangement. The second protective layer 22 is an intermediate interlayer, preferably a damping material such as epoxy resin or polyurethane, which can further buffer and absorb external impact load. The first protective layer 21 and the second protective layer 22 can absorb most of the external force, and the third protective layer 23 serves as a safety reserve to cope with larger impact load. Specifically, the third protective layer 23 is composed of a plurality of energy absorption boxes 231, which are arranged at the same positions as the negative Poisson's ratio unit bodies 211, and the outer shell material of the energy absorption boxes 231 is preferably plastic material which will not fail in brittle manner, and the internal springs 2311 are arranged vertically to the acting surface to provide greater support to the entire structure. The energy absorption boxes 231 have a variable cross-section with a narrow upper part and a wide lower part, the narrow part faces outward, and the wide part is close to the engineering project, thus forming a stress dispersion structure.

[0029] As shown in the drawings, Figure 3 The application is a safety fence for major civil engineering sites with anti-collision and energy dissipation functions Figure 1 As shown, the concave buckle 11 arranged on the side of the vertical protective rod 1 is connected with the convex buckle 24 arranged on the side of the protective panel 2, forming the entire safety fence. Specifically, the concave buckle 11 is provided with a groove 111 matching the size of the convex buckle 24 for insertion, in addition, the concave buckle 11 and the convex buckle 24 are respectively provided with a bolt hole 112 and a screw hole 241 at the same position, the side wall of the screw hole is provided with a thread 242, and the two are connected through a screw rod.

[0030] In the embodiment, the material and structural parameters of the safety fence for major civil engineering sites with anti-collision and energy dissipation functions are as follows: the material of the vertical protective rod 1 should be comparable in strength to steel, the distance between the vertical protective rods is not greater than 2m, and the height of the vertical protective rod is preferably in the range of 1.0m-1.2m.

[0031] The thickness of the first protective layer 21 and the third protective layer 23 is consistent, which should not be less than 50mm for major projects, and the thickness of the second protective layer is the smallest but should not be less than 20mm; the wire diameter of the spring 2311 is preferably 2-2.5mm, the diameter of the spring should not be less than 20mm, and the material is steel; the length-width ratio of the cross section of the energy absorption box 231 is preferably 1.5:1, and the thickness is preferably 30mm.

[0032] It should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "front", "back", "top / bottom end" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation. The "first", "second" are also only for the convenience of description and differentiation, and therefore cannot be understood as a limitation on the present application.

[0033] The above description is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes within the technical range disclosed by the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A safety guardrail for use at a major civil engineering site with a collision prevention and energy dissipation function, comprising a vertical guard bar (1) and a guard panel (2), wherein a guard panel (2) is arranged between every two vertical guard bars (1), the vertical guard bars (1) are grounded and fixed, and the height of the vertical guard bars (1) is higher than the height of the guard panel (2), and is characterized in that: The vertical protection rod (1) is provided with a plurality of concave buckles (11) on the side, and the protection panel (2) is provided with a plurality of convex buckles (24) on the side. The concave buckles (11) are provided with grooves (111) of a size matching the convex buckles (24), and the convex buckles (24) are inserted into the grooves (111). The protection panel (2) is composed of a first protection layer (21), a second protection layer (22) and a third protection layer (23) stacked in sequence to form a multi-level anti-collision structure. The first protection layer (21) is located in the reverse position of the civil engineering and is composed of a plurality of negative Poisson's ratio unit bodies (211); the second protection layer (22) is provided with a plurality of negative Poisson's ratio unit bodies (211); the second protection layer (22) is provided with a plurality of negative Poisson's ratio unit bodies (211); the third protection layer (23 ... ) is an intermediate interlayer composed of a damping material, and the damping material is epoxy resin or polyurethane; the third protective layer (23) is composed of a plurality of energy absorbing boxes (231), the shell material of the energy absorbing box (231) is a plastic material, and the plane layout position of the energy absorbing box (231) is consistent with the negative Poisson's ratio unit body (211); the spring (2311) is arranged perpendicular to the vertical action surface inside the energy absorbing box (231); the energy absorbing box (231) is a variable cross-section form, and the overall structure is narrow at the top and wide at the bottom, with the narrow side facing outward and the wide side close to the civil engineering side, forming a structural form that both transmits and diffuses stress.

2. A safety guardrail for use on major civil engineering sites with anti-collision and energy dissipation functions as claimed in claim 1, characterized in that: The lateral width of the vertical protection bar (1) is greater than the thickness of the protection panel (2), and a reflective strip is provided on the vertical protection bar (1); the spacing between the vertical protection bars (1) is not greater than 2m, and the height of the vertical protection bar (1) is 1.0m-1.2m.

3. The safety guardrail for use on major civil engineering sites with anti-collision and energy dissipation functions as claimed in claim 1, characterized in that: A pin hole (112) and a screw hole (241) are respectively provided at the same position of the concave buckle (11) and the convex buckle (24), and a thread (242) is provided on the side wall of the screw hole (241). The concave buckle (11) and the convex buckle (24) are connected by a screw rod, thereby connecting the vertical protection rod (1) and the protection panel (2) into a whole.

4. A safety guardrail for use on major civil engineering sites with anti-collision and energy dissipation functions as claimed in claim 1, 2 or 3, characterized in that: The plane arrangement of the negative Poisson's ratio unit body (211) is a plum blossom arrangement, and the plane arrangement position of the energy absorption box (231) is consistent with the negative Poisson's ratio unit body (211).

5. A safety guardrail for use on major civil engineering sites with anti-collision and energy dissipation functions as claimed in claim 4, characterized in that: The thickness of the first protective layer (21) and the third protective layer (23) is consistent and not less than 50 mm; the thickness of the second protective layer (22) is less than the thickness of the first protective layer (21) and the third protective layer (23), but not less than 20 mm.

6. A safety guardrail for use on major civil engineering sites with anti-collision and energy dissipation functions as claimed in claim 5, characterized in that: The wire diameter of the spring (2311) is 2-2.5 mm, the diameter of the spring (2311) is not less than 20 mm, and the material is steel.

7. A safety guardrail for use on major civil engineering sites with anti-collision and energy dissipation functions as claimed in claim 6, characterized in that: The energy absorption box (231) has a cross-sectional aspect ratio of 1.5:(0.9-1.1) and a thickness of 28-33 mm.

8. The safety guardrail for use on major civil engineering sites with anti-collision and energy dissipation functions as claimed in claim 2, characterized in that: A latch hole (112) and a screw hole (241) are respectively provided at the same position of the concave buckle (11) and the convex buckle (24), and a thread (242) is provided on the side wall of the screw hole (241). The concave buckle (11) and the convex buckle (24) are connected by a screw, thereby connecting the vertical protection rod (1) and the protection panel (2) into a whole; the plane layout of the negative Poisson's ratio unit body (211) is a plum blossom layout, and the plane layout position of the energy absorption box (231) is consistent with the negative Poisson's ratio unit body (211); the thickness of the first protection layer (21) and the third protection layer (23) are consistent, both of which are 50~80mm; the thickness of the second protection layer (22) is 25~45mm; the wire diameter of the spring (2311) is 2~2.5mm, and the diameter of the spring (2311) is 25 ~50mm, and is made of steel; the energy absorption box (231) has a cross-sectional aspect ratio of 1.5:(0.9~1.1) and a thickness of 29~32mm.

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