Self-resetting concrete anti-collision guardrail for bridge floor

Abstract

The utility model discloses a self-resetting concrete anti-collision guardrail for a bridge floor. The self-resetting concrete anti-collision guardrail is characterized by comprising a concrete guardrail main body, a resetting prestressed tendon, an energy consumption screw rod, a limiting screw rod, a fixing nut, a gasket, a resetting spring, a limiting male connector, a limiting female connector and sealing mortar. The rear end of the prefabricated concrete guardrail body is connected with a bridge plate through the pre-embedded male and female limiting connectors, the front end of the prefabricated concrete guardrail body is connected with a bridge deck through the reset prestressed tendons, the energy dissipation screws and the limiting screws, the concrete guardrail body can turn backwards to a certain extent when a vehicle collides, the energy dissipation screws are pulled and broken to dissipate energy, and excessive deformation is limited through the energy dissipation screws. And finally, self-resetting is realized through elastic contraction of the resetting prestressed tendon and pre-pressing of the spring by the limiting screw rod. According to the design of the guardrail, the energy-consuming screw rod is convenient to replace, efficient maintenance is achieved, and meanwhile the energy-consuming and resetting functions are achieved.

Description

Technical Field

[0001] The present invention relates to the field of bridge anti-collision guardrails, and in particular to a self-resetting concrete anti-collision guardrail for bridge decks. Background Art

[0002] Bridge anti-collision guardrails play a role in protecting driving safety, preventing out-of-control vehicles from rushing out of the bridge deck, and beautifying bridge buildings. Bridge anti-collision guardrails can be divided into three types according to material classification: concrete guardrails, steel guardrails, and combined guardrails. Concrete guardrails are widely used in bridge structures due to their low cost, easy maintenance, and good durability. At present, most concrete guardrails are directly cast. Due to the protection level requirements, they are large in size and have high guardrail costs. Although the need for later maintenance is small, due to their high rigidity and poor energy consumption performance, they are very likely to aggravate the damage to vehicles and personnel during collisions. When the collision energy is too large, the brittle failure of concrete causes fragments to splash and easily cause greater damage to the site. In recent years, some new anti-collision guardrails have continued to emerge. The new anti-collision guardrails are required to have greater anti-collision rigidity, and at the same time, they are also expected to have characteristics such as self-reset and energy consumption. Existing concrete guardrails are difficult to achieve these functional requirements at the same time. Utility Model Content

[0003] In response to the development needs of bridge anti-collision guardrails, the present invention proposes a self-resetting concrete anti-collision guardrail for bridge decks, which can effectively overcome the problems of weak energy dissipation capacity of traditional reinforced concrete guardrails, inability to eliminate plastic deformation caused by vehicle impact, poor interface bonding performance with bridge decks, difficulty in repairing guardrails after vehicle impact, and inconvenient maintenance. It also has the advantages of simple structure and easy replacement of important components.

[0004] In order to achieve the above technical objectives, the technical solutions adopted by the present utility model are specifically described as follows:

[0005] A self-resetting concrete anti-collision guardrail for a bridge deck, characterized in that: the guardrail comprises a concrete guardrail body, a reset prestressed tendon, an energy-absorbing screw, a limit screw, a fixing nut, a gasket, a reset spring, a limit male joint, a limit female joint and a sealing mortar; the concrete guardrail body is a prefabricated component, 3-4 limit male joints are pre-embedded at equal intervals at the rear end of the concrete guardrail body, 6-9 vertical holes are reserved at equal intervals at the front end of the concrete guardrail body, and a horizontal platform is arranged above the holes; when installing the concrete guardrail body, the limit male joint at the rear end is first clamped The prestressed steel bar is inserted into the pre-buried limit female joint on the bridge deck, and then the reset prestressed steel bar, the energy-absorbing screw and the limit screw are sequentially passed through the reserved holes at the front end of the concrete guardrail body and the reserved holes on the bridge deck, and nuts and washers are used to fix the reset prestressed steel bar, the energy-absorbing screw and the limit screw respectively passing through the fixing nuts and washers; the reset prestressed steel bar is prestressed through the fixing nuts; a reset spring is also required to be installed on the upper end of the limit screw before installing the fixing nuts and washers; the sealing mortar is used to seal the upper and lower ends of all reserved holes after installing the fixing nuts and washers.

[0006] Preferably, the prefabricated length of the concrete guardrail body is 6-9 meters, the reserved vertical hole spacing is 1-2 meters, and the number of reserved vertical holes is a multiple of 3.

[0007] Preferably, the guardrail limiting male joint is embedded in the bridge deck limiting female joint, and after the embedding, the concrete guardrail can rotate around it after being hit by a vehicle to prevent excessive displacement of the guardrail.

[0008] Preferably, the return spring is compressed and deformed after the guardrail is hit and rotated to accumulate necessary return energy, and releases the return energy after the impact subsides to drive the guardrail to return to shape.

[0009] Preferably, the limit screw fixes the return spring and is fixed to the fixing nut at the bottom of the guardrail to limit excessive rotation of the guardrail, thereby ensuring the integrity of the guardrail and preventing vehicles from crossing the guardrail and rushing out of the bridge deck.

[0010] Preferably, the guardrail is provided with a fixing nut at the bottom of the lowest end of the vertical hole in the bridge deck, and both ends of the guardrail reset prestressed tendons and energy-absorbing screws are provided with threads. The bottom ends of the reset prestressed tendons and the energy-absorbing screws pass through the vertical holes and engage with the fixing nuts, and the upper ends are fixed by fixing nuts; preferably, after the upper end of the reset prestressed tendons is tensioned to generate prestress, the reset prestressed tendons are fixed to the horizontal platform by rotating the fixing nut.

[0011] Preferably, the reset prestressed tendons are fiber tendons, prestressed steel strands, and high-strength steel bars, and the energy-absorbing screw is made of low-carbon steel, and its yield strength and screw diameter are smaller than those of the limiting screw.

[0012] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0013] 1. The guardrail proposed by the present invention has the characteristic of dissipating energy. The impact energy received by the guardrail structure is weakened by the deformation and destruction of the energy-consuming screw, and has good buffering performance. The guardrail has the characteristic of being resettable. The internal reset prestressed tendons and reset spring devices are used to convert the vehicle impact energy into recovery energy. After the impact, the reset prestressed tendons and reset springs restore their original lengths to reset the columns. The guardrail is safe. The maximum movement range of the guardrail is limited by the limit screw, thereby controlling the displacement of the guardrail in the event of a collision to avoid potential structural damage caused by excessive movement.

[0014] 2. The guardrail reset prestressed tendons and energy dissipation screws proposed by the present invention can be freely adjusted to meet the needs of high-risk traffic sections. This method enhances the energy dissipation capacity of the guardrail system by increasing the number of important components, and in the event of a collision, through the synergistic effect of the reset prestressed tendons, effectively improves the impact impedance and self-recovery function of the anti-collision guardrail.

[0015] 3. The self-resetting concrete anti-collision guardrail proposed in the present invention has a stable structure. By assembling the reset prestressed tendons, energy-absorbing screws and limit screws, and connecting with the bridge deck fixing nuts, the physical connection stability of the entire anti-collision guardrail and the bridge is ensured, the interface bonding performance between the guardrail and the bridge deck is improved, and the impact resistance of the overall structure is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is an overall schematic diagram of a self-resetting concrete anti-collision guardrail for a bridge deck.

[0017] Figure 2 It is a structural rear view of the self-resetting concrete anti-collision guardrail used for bridge decks of the utility model.

[0018] Figure 3 The utility model is a schematic diagram of the local reset prestressed steel bars and energy dissipation screws of the self-resetting concrete anti-collision guardrail for bridge decks.

[0019] Figure 4 The utility model is a schematic diagram of the structure of a local limiting screw and a reset spring of a self-resetting concrete anti-collision guardrail for a bridge deck.

[0020] Figure 5 The utility model is a schematic diagram of the structure of the limiting embedded parts of the self-resetting concrete anti-collision guardrail for the bridge deck.

[0021] Figure 6 This is a diagram showing the local deformation of the energy-consuming screw of the self-resetting concrete anti-collision guardrail for bridge decks according to the utility model after a vehicle collision.

[0022] Figure numerals: 1: concrete guardrail body, 2: reset prestressed tendon, 3: energy absorption screw, 4: limit screw, 5: fixing nut, 6: gasket, 7: reset spring, 8: limit male joint, 9: limit female joint, 10: sealing mortar. DETAILED DESCRIPTION

[0023] The technical solution of the utility model is illustrated below, and the scope of protection requested for the utility model includes but is not limited to the following embodiments.

[0024] A self-resetting concrete anti-collision guardrail for a bridge deck, characterized in that: the guardrail comprises a concrete guardrail body 1, a reset prestressed tendon 2, an energy-absorbing screw 3, a limit screw 4, a fixing nut 5, a gasket 6, a reset spring 7, a limit male joint 8, a limit female joint 9 and a sealing mortar 10; the concrete guardrail body 1 is a prefabricated component, 3-4 limit male joints 8 are pre-buried at equal intervals at the rear end of the concrete guardrail body 1, 6-9 vertical holes are reserved at equal intervals at the front end of the concrete guardrail body 1, and a horizontal platform is arranged above the holes; when the concrete guardrail body 1 is installed, the limit male joint 8 at its rear end is firstly inserted Insert it into the pre-buried limiting female joint 9 on the bridge deck, then use the reset prestressed tendon 2, energy-absorbing screw 3 and limit screw 4 to pass through the reserved holes at the front end of the concrete guardrail body 1 and the reserved holes in the bridge deck in turn, and use the fixing nut 5 and gasket 6 to fix the reset prestressed tendon, energy-absorbing screw and limit screw passing through the reserved holes respectively; the reset prestressed tendon 2 is prestressed by the fixing nut 5; the upper end of the limit screw 4 needs to be installed with a reset spring 7 before installing the fixing nut 5 and the gasket 6; the sealing mortar 10 is used to seal the upper and lower ends of all reserved holes after installing the fixing nut 5 and the gasket 6.

[0025] Preferably, the prefabricated length of the concrete guardrail body 1 is 6-9 meters, the reserved vertical hole spacing is 1-2 meters, and the number of reserved vertical holes is a multiple of 3.

[0026] Preferably, the guardrail limiting male joint 8 is embedded in the bridge deck limiting female joint 9, so that the concrete guardrail can rotate around it after being hit by a vehicle to prevent excessive displacement of the guardrail.

[0027] Preferably, the return spring 7 is compressed and deformed after the guardrail is hit and rotated to accumulate necessary return energy, and releases the return energy after the impact subsides to drive the guardrail to return to shape.

[0028] Preferably, the limit screw 4 fixes the reset spring 7 and is fixed to the fixing nut 5 at the bottom of the guardrail to limit excessive rotation of the guardrail, thereby ensuring the integrity of the guardrail and preventing vehicles from crossing the guardrail and rushing out of the bridge deck.

[0029] Preferably, the guardrail is provided with a fixing nut 5 at the bottom of the lowest end of the vertical hole in the bridge deck, and both ends of the guardrail reset prestressed tendon 2 and the energy-absorbing screw 3 are provided with threads. The bottom ends of the reset prestressed tendon 2 and the energy-absorbing screw 3 pass through the vertical holes and engage with the fixing nut 5, and the upper ends are fixed by the fixing nut 5; preferably, after the upper end of the reset prestressed tendon 2 is tensioned to generate prestress, the reset prestressed tendon 2 is fixed to the horizontal platform by rotating the fixing nut 5.

[0030] Preferably, the reset prestressed tendon 2 is a fiber tendon, a prestressed steel strand, or a high-strength steel bar, and the energy-absorbing screw 3 is made of low-carbon steel, and its yield strength and screw diameter are both smaller than those of the limiting screw 4 .

Claims

1. A self-resetting concrete anti-collision guardrail for a bridge deck, characterized in that: The guardrail comprises a concrete guardrail body, reset prestressed tendons, energy-absorbing screws, limit screws, fixing nuts, gaskets, reset springs, limit male joints, limit female joints and sealing mortar; the concrete guardrail body is a prefabricated component, 3-4 limit male joints are pre-embedded at equal intervals at the rear end of the concrete guardrail body, 6-9 vertical holes are reserved at equal intervals at the front end of the concrete guardrail body, and a horizontal platform is arranged above the holes; when installing the concrete guardrail body, the limit male joint at its rear end is first inserted into the limit female joint pre-embedded on the bridge deck; In the joint, the reset prestressed tendons, energy-absorbing screws and limit screws are then used to pass through the reserved holes at the front end of the concrete guardrail body and the reserved holes on the bridge deck in turn, and nuts and gaskets are used to fix the reset prestressed tendons, energy-absorbing screws and limit screws respectively passing through the fixing nuts and gaskets; the reset prestressed tendons are prestressed through the fixing nuts; a reset spring is also required to be installed at the upper end of the limit screw before installing the fixing nuts and gaskets; the sealing mortar is used to seal the upper and lower ends of all reserved holes after installing the fixing nuts and gaskets.

2. The self-resetting concrete anti-collision guardrail according to claim 1 is characterized in that: The prefabricated length of the concrete guardrail body is 6-9 meters, the reserved vertical hole spacing is 1-2 meters, and the number of reserved vertical holes is a multiple of 3.

3. The self-resetting concrete anti-collision guardrail according to claim 1 is characterized in that: The energy-consuming screw is made of low-carbon steel, and its yield strength and screw diameter are smaller than those of the limiting screw.

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