CN111877229A - Functionally-gradient anti-collision guardrail and construction method thereof - Google Patents
Functionally-gradient anti-collision guardrail and construction method thereof Download PDFInfo
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- CN111877229A CN111877229A CN202010784028.4A CN202010784028A CN111877229A CN 111877229 A CN111877229 A CN 111877229A CN 202010784028 A CN202010784028 A CN 202010784028A CN 111877229 A CN111877229 A CN 111877229A
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- 230000021715 photosynthesis, light harvesting Effects 0.000 claims abstract description 178
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 140
- 230000004888 barrier function Effects 0.000 claims abstract description 35
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims description 16
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 11
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- 238000000034 method Methods 0.000 claims description 7
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/02—Continuous barriers extending along roads or between traffic lanes
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
- E01D19/103—Parapets, railings ; Guard barriers or road-bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
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Abstract
The invention discloses a functionally graded anti-collision guardrail which comprises a base, an energy dissipation layer and a UHPC panel, wherein the energy dissipation layer is arranged between the base and the UHPC panel. The invention also provides a construction method of the functional gradient anti-collision guardrail, which comprises the following steps: s1: prefabricating a reinforced concrete base, a UHPC panel and an energy dissipation layer; synchronously reserving pipelines for installing energy dissipation connecting pieces when the reinforced concrete base, the UHPC panel and the energy dissipation layer are prefabricated; s2: mounting the base on a bridge or a road; s3: and installing an energy dissipation layer and an UHPC panel on the base, and inserting an energy dissipation connecting piece to complete the construction of the functional gradient anti-collision guardrail. The crash barrier adopting the functional gradient has the advantages of good guidance, reduction of accident consequences, good durability, low manufacturing cost, short construction period, simple and convenient maintenance and replacement and the like, has great use value and good economic benefit, and has wide application prospect.
Description
Technical Field
The invention belongs to the field of road and bridge auxiliary facilities, and particularly relates to an anti-collision guardrail and a construction method thereof.
Background
The traffic accident on the highway is closely related to the geometric characteristics of the road and the traffic accessories, and the guardrail on the highway is an important factor influencing the traffic safety. Statistics show that in road traffic accidents, traffic accidents on expressways account for 55%, and 30% of them are vehicles coming into contact with (collision, scraping, etc.) highway barriers or directly leaving the road. In 2018, 28 th month 10, the second bridge in the Yangtze river in Chongqing Wanzhou district breaks through the bridge guardrail and falls into the Yangtze river, so that all 15 people of the bus die or lose connection. In 13 days 6 and 13 of 2020, a tank car on a highway in Wenling of Zhejiang explodes and rushes out of the highway, so that the house and the factory buildings around the tank car collapse, and 20 people die. These accidents have caused extensive thinking and thinking about guardrail design in both the engineering and academic circles.
The guardrail is an important component of a road and bridge structure and has the primary function of preventing or stopping vehicles from driving out of the road and bridge (including the situations that the vehicles break through a guardrail plate, the vehicles cross over the guardrail plate, the vehicles drill out from the lower part of the guardrail plate and the like), so that the safety of personnel inside and outside the vehicles, the road and bridge and other buildings is ensured. The guardrail is used for protecting the vehicle and passengers and can smoothly guide the collided vehicle to leave the guardrail at a smaller driving-off angle and a smaller rebound quantity, so that a normal driving track is recovered, a serious secondary collision accident is avoided, the safety of adjacent roads and other driving vehicles is ensured, and the serious rolling condition of the out-of-control vehicle is prevented. The reinforced concrete rigid guardrail has been widely used in domestic bridge engineering due to the advantages of good economy, good impact resistance and the like. However, studies have shown that: although the traditional reinforced concrete rigid guardrail has the advantage of strong impact resistance, the traditional reinforced concrete rigid guardrail has the defects of large impact force borne by drivers and passengers, poor vehicle guidance performance and the like, and a large number of secondary collision accidents and casualties are caused. The steel structure guardrail of corresponding grade has the power consumption and well, compares that rigid concrete guardrail guidance quality is better, nevertheless has that initial stage cost is high, because of the easy inefficacy of steel corrosion problem, maintenance cost height etc. is not enough, and just there is the danger that easily invades in the automobile body in the steel guardrail of collision in-process, leads to the casualties. Therefore, it is necessary to further develop a new generation of high performance guardrail in combination with the objective requirements of guardrail function, and the requirements of high performance guardrail are as follows: (1) the vehicle can be effectively prevented from rushing out of the guardrail; (2) the buffer guide device has good buffer guide effect, and avoids large rebound quantity and secondary collision accidents.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects and shortcomings in the background technology and provides a functionally graded crash barrier with good crashworthiness and good buffering guidance quality and a construction method thereof. In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the utility model provides a function gradient anticollision barrier, includes base, energy dissipation layer and UHPC panel, the energy dissipation layer is located between base and the UHPC panel. The functional gradient anti-collision guardrail can be arranged on two sides of a bridge or a road and a central separation strip.
In the above functionally graded crash barrier, preferably, the functionally graded crash barrier further comprises an energy dissipation connector connecting the base, the energy dissipation layer and the UHPC panel into a whole, and the energy dissipation connector is provided with one or more than one. The energy dissipation connecting piece not only has the functions of connecting the UHPC panel, the base and the energy dissipation layer, but also has the functions of limiting the displacement of the UHPC panel when the UHPC panel compresses the energy dissipation layer to displace when collision occurs; namely, when the UHPC panel and the energy dissipation layer are compressed along the collision direction after collision, the deformation of the energy dissipation connecting piece can be driven, and then energy is consumed. As a vulnerable component, the yield strength of the energy dissipation connecting piece can be adjusted to meet the requirements of different anti-collision grades, and the energy dissipation connecting piece is very convenient to install and replace. In the functionally graded crash barrier, preferably, the energy dissipation connector penetrates through the UHPC panel and the energy dissipation layer and extends into the base, and the installation direction of the energy dissipation connector is not parallel to the vehicle impact direction. Pipelines for installing energy dissipation connecting pieces are reserved in the UHPC panel, the base and the energy dissipation layer, and after assembly is completed, fillers such as polyurethane foam can be filled in gaps of the pipelines, so that the effect of protecting the durability of the energy dissipation connecting pieces is achieved.
In the functional gradient anti-collision guardrail, preferably, the energy dissipation connecting piece is a metal rod, a metal pipe or other components (such as metal composite material rods/pipes) with certain toughness and good ductility, and the requirements of different anti-collision performances can be met by adjusting the yield strength of the energy dissipation connecting piece.
In the invention, the positions and the number of the energy dissipation connecting pieces can be adjusted according to the actual construction and assembly requirements of the guardrail, a single piece or a plurality of pieces can be arranged on the same section, the positions of the energy dissipation connecting pieces can be arranged at the top of the guardrail, and can also be arranged at the front side or the rear side of the UHPC according to the requirements, and the shapes of the energy dissipation connecting pieces can also be arranged in a linear type, a curve type and the like.
In the above functionally graded crash barrier, preferably, the UHPC panel is pre-configured with transverse reinforcing steel bars or longitudinal reinforcing steel bars. The UHPC panel is formed by pouring active powder concrete or ultra-high performance fiber reinforced concrete, and reinforcing steel bars in two directions are arranged inside the UHPC panel, so that the strength and the collision resistance of the UHPC panel are improved.
In the functionally graded crash barrier, preferably, the energy dissipation layer is a prefabricated member or a cast-in-place member (cast by using the base and the UHPC panel as a template), and the energy dissipation layer is a member with good energy dissipation properties, such as polyurethane foam, metal foam, foam concrete or metal corrugated plate. The energy dissipating layer should be selected to be durable.
In the above function gradient crash barrier, preferably, the energy dissipation layer is assembled and combined by multiple segments. The energy dissipation layer is assembled by multiple sections, so that the energy dissipation layer is convenient to transport and assemble, damaged sections can be replaced in time after collision occurs, the reliability of the structure is guaranteed, and the replacement cost is relatively lower.
Among the above-mentioned functional gradient anticollision barrier, preferred, the base is prefabricated reinforced concrete base, reserve in the base and be equipped with the filling pipe who is used for base and bridge or road fixed connection. Generally, connecting steel bars or steel pipe columns of the installation base can be reserved on a bridge or a road, when the base is installed, the pouring pipeline of the base is connected with the connecting steel bars or the steel pipe columns, and then UHPC or high-strength mortar is poured into the pouring pipeline. The base of the invention needs to be reliably connected with a bridge and a road, the structural strength of the base and the strength of the connecting piece ensure that the guardrail cannot be broken off by a vehicle due to the integral failure of the guardrail or the partial failure of the concrete part caused by the unreliable connecting piece after the vehicle collides, and the effect of ensuring safety is achieved. In order to increase the strength of the foundation, transverse reinforcing bars and longitudinal reinforcing bars are generally arranged in the foundation.
In the functionally graded crash barrier, preferably, the thickness of the UHPC panel is 5-10cm, and the thickness of the energy dissipation layer is 8-15 cm. The UHPC panel and the energy dissipation layer are used for the anti-collision guardrail, and the UHPC panel and the energy dissipation layer are matched with each other through the optimized design and material selection of each energy dissipation layer (for example, the UHPC material is selected for the panel, so that a thinner component has good anti-collision performance), so that the UHPC panel and the energy dissipation layer can meet the requirements by adopting the thinner component, the material consumption can be greatly reduced, the thickness of the guardrail is reduced, and the transportation and installation cost is reduced.
As a general technical concept, the invention also provides a construction method of the functionally graded crash barrier, which comprises the following steps:
s1: prefabricating a reinforced concrete base, a UHPC panel and an energy dissipation layer; synchronously reserving pipelines for installing energy dissipation connecting pieces when the reinforced concrete base, the UHPC panel and the energy dissipation layer are prefabricated;
s2: mounting the base on a bridge or a road;
s3: and installing an energy dissipation layer and an UHPC panel on the base, and inserting an energy dissipation connecting piece to complete the construction of the functional gradient anti-collision guardrail.
Ultra-High Performance Fiber-reinforced concrete (UHPFRC), abbreviated as UHPC, has the advantages of Ultra-High strength (compressive strength >150MPa, tensile strength >8MPa), toughness, Ultra-High durability (such as 1/100 with chloride ion diffusion coefficient only being common concrete, etc.), and the like, and is considered as a cement-based material with the greatest innovation in the past thirty years. Reactive powder concrete has been widely used in practical engineering as a typical UHPC material. UHPC not only has ultrahigh strength, but also has special tensile strain hardening behavior, so that the UHPC has excellent impact resistance and energy consumption performance. The Bindigianavaille et al test shows that: under the impact action, the bending strength of UHPC is 2 times that of fiber reinforced concrete, and the breaking energy is 3-4 times higher. The ultra-high performance concrete is combined with the energy dissipation material and the common concrete structure, the UHPC panel is combined with the energy dissipation layer to play the roles of energy dissipation buffering and guiding, vehicles and vehicle safety are effectively protected, the concrete base serves as the final safety bottom line to protect the vehicles from rushing out of the guardrail, the requirement of realizing the functional gradient by using different materials is met, the advantages which cannot be achieved by the traditional materials and the traditional guardrails are achieved, the creative attempt fully exerts the mechanical characteristics of the UHPC, the ultra-high performance concrete is expected to have great potential for exciting the application of the ultra-high performance concrete in the field of the anti-collision guardrails, and the ultra-high performance concrete has wide industrial application prospect.
In the invention, the UHPC panel is prefabricated by ultra-high performance concrete, and forms an energy dissipation part together with the energy dissipation layer and the energy dissipation connecting piece of the middle interlayer, thereby realizing the functions of energy dissipation and guidance after collision and further protecting the safety of drivers and passengers and vehicles. The specifications and shapes of the UHPC panel, the base and the energy dissipation layer can be correspondingly adjusted according to the actual grade of the guardrail.
The UHPC panel has excellent impact resistance, durability and toughness, the construction quality can be ensured by adopting the prefabricated UHPC panel, the construction efficiency of the whole project can be ensured, the UHPC panel is used as a member which is firstly contacted with collision objects such as vehicles and the like when collision occurs, the main functions are to transmit the load during collision, disperse the collision, allow more energy consumption layers to participate in energy consumption, and the excellent impact resistance can ensure that the UHPC panel cannot be damaged too early, thereby fully playing the guiding performance. The UHPC panel utilizes the self energy consumption characteristic, and combines the energy consumption layer and the energy dissipation connecting piece which are tightly attached to the UHPC panel, so that the combined action of the UHPC panel, the UHPC panel and the UHPC panel can greatly play the energy dissipation role of the structure.
The energy dissipation layer has the characteristics of light weight, good energy dissipation capability, corrosion resistance and the like, can be assembled after being prefabricated, can also be constructed in a field pouring mode, has the combined action of the UHPC panel and the energy dissipation layer, can also play a role in guiding, is beneficial to recovering a vehicle into a driving lane line after the vehicle is collided, and avoids the hazards of falling of the vehicle, rushing out of a guardrail and the like.
The energy dissipation connecting piece can be simply arranged into a metal rod or a metal pipe, and can also be arranged into other structures with good energy dissipation characteristics, the UHPC panel, the energy dissipation layer and the concrete base are connected, and when collision occurs, the UHPC panel is collided and then the energy dissipation layer is compressed along the collision direction, so that the energy dissipation connecting piece is forced to participate in energy dissipation along with deformation, and the two functions of connection and energy dissipation are achieved. The energy dissipation connecting piece can meet the requirements of guardrails of different anti-collision grades by adjusting the bearing capacity of the energy dissipation connecting piece, and is very convenient to install and construct. In the invention, the energy dissipation connector can further play the combined role of the UHPC panel and the energy dissipation layer, and ensure that the guardrail of the invention can play the due energy dissipation characteristic.
The base is assembled after being prefabricated and serves as a component for guaranteeing bearing capacity, and the base has a safety protection function and prevents vehicles from rushing out of the guardrail to cause serious consequences.
According to the invention, the UHPC panel, the energy dissipation layer, the energy dissipation connecting piece and the base have different functions, and after the components are organically combined, the components are mutually matched to realize the function of gradient energy dissipation, so that the guardrail has good buffering and guiding functions, can effectively prevent vehicles from rushing out of the guardrail, avoids large resilience and secondary collision accidents, and has wide market application prospect.
In the invention, the UHPC panel, the energy dissipation layer and the energy dissipation connecting piece are all arranged as components convenient to replace, and the components are replaced after a serious collision accident, so that the negative influence caused by the interruption of traffic construction and the repair of the structure can be reduced to the maximum extent.
Compared with the prior art, the invention has the advantages that:
1. the UHPC panel adopted by the invention has the advantages of high strength, excellent shock resistance and the like, can enable energy dissipation layers with more areas to participate in energy dissipation after collision, fully play the energy dissipation function of the guardrail and protect the safety of drivers and passengers and vehicles by utilizing the buffering and guiding functions of the UHPC panel.
2. The UHPC panel, the base, the energy dissipation layer and other components adopted by the invention are mutually matched and have a synergistic effect, and the invention has the advantages of good anti-collision performance, good buffering guidance quality and the like.
3. The UHPC panel, the base, the energy dissipation layer and the like adopted by the invention can be prefabricated, the construction period is short, the construction efficiency is high, the damaged components can be replaced in time after an accident happens, the maintenance and the replacement are convenient, and the influence caused by the accident is reduced.
4. The prefabricated UHPC panel, the base and the energy dissipation layer adopted by the invention have good durability, ensure the working performance of bridges and roads in the whole life cycle and reduce the maintenance cost.
5. The anti-collision guardrail adopted by the invention is formed by combining the UHPC panel, the base and the energy dissipation layer, and the phenomenon that drivers and passengers are injured and killed due to the fact that steel components possibly existing in a steel guardrail structure penetrate into a vehicle does not exist during collision, so that the safety of the drivers and passengers can be better ensured.
In general, the crash barrier adopting the functional gradient has the advantages of good guidance, reduction of accident consequences, good durability, low manufacturing cost, short construction period, simple and convenient maintenance and replacement and the like, and has great use value, good economic benefit and wide application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of the functionally gradient crash barrier in a bridge according to embodiment 1.
Fig. 2 is a schematic structural view of the functionally gradient crash barrier in the roadbed of the road in embodiment 2.
Fig. 3 is a schematic view of the structure of the functionally graded crash barrier of embodiment 3 in a split center divider.
Fig. 4 is a schematic view of the functionally graded crash barrier of example 4 in a unitary center divider.
Illustration of the drawings:
1. a UHPC panel; 2. a base; 3. an energy dissipation layer; 4. energy dissipation connecting pieces; 5. filling a pipeline; 6. reserving reinforcing steel bars on the beam body; 7. transverse reinforcing steel bars; 8. longitudinal reinforcing steel bars; 9. a beam body cantilever arm; 10. reinforcing steel bars in the beam body; 11. a surface layer; 12. a cushion layer; 13. steel pipe piles; 14. an earth roadbed; 15. a bolster; 16. a support block; 17. planting soil; 18. a channel sleeper beam.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Example 1:
as shown in fig. 1, the functionally graded crash barrier of this embodiment includes a base 2, an energy dissipation layer 3, a UHPC panel 1, and an energy dissipation connector 4, wherein the energy dissipation layer 3 is disposed between the base 2 and the UHPC panel 1, the base 2, the energy dissipation layer 3, and the UHPC panel 1 are connected into a whole by the energy dissipation connector 4, and the energy dissipation connector 4 is provided with one or more (only one is shown in the figure).
In this embodiment, the guardrail is installed on the roof beam body is chosen arm 9, and the roof beam body is chosen and is reserved on arm 9 and be connected required roof beam body reservation reinforcing bar 6 with base 2, and the roof beam body is chosen the internal reinforcing bar of pre-buried roof beam in the arm 9.
In this embodiment the dissipater connector 4 extends through the UHPC panel 1 and dissipater 3 and into the base 2, the dissipater connector 4 being located at the top of the fence.
In this embodiment, the energy dissipating connecting member 4 is a metal rod or a metal pipe.
In this embodiment, the UHPC panel 1 is an ultra-high performance concrete structure, and a transverse reinforcing steel bar or a longitudinal reinforcing steel bar is pre-configured in the UHPC panel 1, and the UHPC panel 1 is located on the side of a roadway and used as a first contact member in the event of collision, and first needs sufficient strength and toughness to ensure that the UHPC panel 1 is not damaged too early, and the UHPC panel, the energy dissipation layer 3 and the energy dissipation connector 4 work together to achieve the functions of energy dissipation and guiding.
In this embodiment, the energy dissipation layer 3 can be prefabricated into small sections convenient for transportation, and assembled on the base 2 on site, or temporarily fixed after the UHPC panel 1 is installed, so that the UHPC panel 1 and the base 2 can be used as a pouring template for pouring energy dissipation materials on site, such as polyurethane foam, foam concrete, and the like; no matter the energy dissipation layer is assembled by the prefabricated rear sections or poured on site, the damaged energy dissipation layer 3 can be replaced after collision occurs, and the reliability and effectiveness of the structure are guaranteed.
In this embodiment, the base 2 is a prefabricated reinforced concrete base, and a perfusion pipeline 5 for fixedly connecting the base 2 with a bridge or a road is reserved in the base 2. The base 2 is prefabricated, the transverse steel bars 7 and the longitudinal steel bars 8 are arranged in concrete, the pouring pipeline 5 required for assembling needs to be reserved when the base 2 is prefabricated, and UHPC needs to be poured into the pouring pipeline 5 after the pouring pipeline 5 is in butt joint with the reserved steel bars 6 of the beam body to ensure the reliability and durability of connection.
In this example, the thickness of the UHPC panel 1 is 5-10cm, and the thickness of the energy dissipation layer 3 is 8-15 cm.
The construction method of the functionally graded crash barrier of the embodiment comprises the following steps:
s1: the method comprises the following steps of prefabricating a reinforced concrete base 2, a UHPC panel 1 and an energy dissipation layer 3; synchronously reserving pipelines for installing energy dissipation connecting pieces 4 when the reinforced concrete base 2, the UHPC panel 1 and the energy dissipation layer 3 are prefabricated; a pouring pipeline 5 at the joint part is required to be reserved for the prefabricated reinforced concrete base 2;
s2: mounting the base 2 on a bridge or a road; the pouring pipeline 5 and the beam body reserved steel bars 6 need to correspond, and UHPC is poured into the pouring pipeline 5 after the installation is finished;
s3: and installing an energy dissipation layer 3 and an UHPC panel 1 on the base 2, then inserting an energy dissipation connector 4, and pouring polyurethane foam into a gap for installing the energy dissipation connector 4, namely finishing the construction of the functionally gradient anti-collision guardrail.
After the construction of the functional gradient anti-collision guardrail is completed, the pavement surface layer 11 or the cushion layer 12 is carried out, and the construction of the whole bridge deck is completed.
Example 2:
as shown in fig. 2, the functionally graded crash barrier of this embodiment includes a base 2, an energy dissipation layer 3, a UHPC panel 1, and an energy dissipation connector 4, wherein the energy dissipation layer 3 is disposed between the base 2 and the UHPC panel 1, the base 2, the energy dissipation layer 3, and the UHPC panel 1 are connected into a whole by the energy dissipation connector 4, and the energy dissipation connector 4 is provided with one or more (only one is shown in the figure).
In the embodiment, the guardrail is installed on the road of the soil roadbed 14, and the steel pipe piles 13 required for connecting the foundation 2 are reserved on the soil roadbed 14.
In this embodiment the dissipater connector 4 extends through the UHPC panel 1 and dissipater 3 and into the base 2, the dissipater connector 4 being located at the top of the fence.
In this embodiment, the energy dissipating connecting member 4 is a metal rod or a metal pipe.
In this embodiment, the UHPC panel 1 is an ultra-high performance concrete structure, and a transverse reinforcing steel bar or a longitudinal reinforcing steel bar is pre-configured in the UHPC panel 1, and the UHPC panel 1 is located on the side of a roadway and used as a first contact member in the event of collision, and first needs sufficient strength and toughness to ensure that the UHPC panel 1 is not damaged too early, and the UHPC panel, the energy dissipation layer 3 and the energy dissipation connector 4 work together to achieve the functions of energy dissipation and guiding.
In this embodiment, the energy dissipation layer 3 can be prefabricated into small sections convenient for transportation, and assembled on the base 2 on site, or temporarily fixed after the UHPC panel 1 is installed, so that the UHPC panel 1 and the base 2 can be used as a pouring template for pouring energy dissipation materials on site, such as polyurethane foam, foam concrete, and the like; no matter the energy dissipation layer is assembled by the prefabricated rear sections or poured on site, the damaged energy dissipation layer 3 can be replaced after collision occurs, and the reliability and effectiveness of the structure are guaranteed.
In this embodiment, the base 2 is a prefabricated reinforced concrete base, and a perfusion pipeline 5 for fixedly connecting the base 2 with a bridge or a road is reserved in the base 2. Base 2 adopts the prefabrication, sets up horizontal reinforcing bar 7 and vertical reinforcing bar 8 in the concrete, and required filling pipe 5 need be reserved when base 2 is prefabricated to assemble, and filling pipe 5 need pour into high strength mortar in filling pipe 5 after inserting with 13 butt joints of steel-pipe pile, guarantees reliability and the durability of connecting.
In this example, the thickness of the UHPC panel 1 is 5-10cm, and the thickness of the energy dissipation layer 3 is 8-15 cm.
The construction method of the functionally graded crash barrier of the embodiment comprises the following steps:
s1: the method comprises the following steps of prefabricating a reinforced concrete base 2, a UHPC panel 1 and an energy dissipation layer 3; synchronously reserving pipelines for installing energy dissipation connecting pieces 4 when the reinforced concrete base 2, the UHPC panel 1 and the energy dissipation layer 3 are prefabricated; a pouring pipeline 5 at the joint part is required to be reserved for the prefabricated reinforced concrete base 2;
s2: mounting the base 2 on a soil subgrade 14; the pouring pipeline 5 and the steel pipe pile 13 need to correspond, and high-strength mortar is poured into the pouring pipeline 5 after the installation is finished;
s3: and installing an energy dissipation layer 3 and an UHPC panel 1 on the base 2, then inserting an energy dissipation connector 4, and pouring polyurethane foam into a gap for installing the energy dissipation connector 4, namely finishing the construction of the functionally gradient anti-collision guardrail.
After the construction of the functional gradient anti-collision guardrail is completed, the pavement surface layer 11 or the cushion layer 12 is carried out, and the construction of the whole pavement is completed.
Example 3:
as shown in fig. 3, the functionally graded crash barrier of this embodiment includes a base 2, an energy dissipation layer 3, a UHPC panel 1, and an energy dissipation connector 4, wherein the energy dissipation layer 3 is disposed between the base 2 and the UHPC panel 1, the base 2, the energy dissipation layer 3, and the UHPC panel 1 are connected into a whole by the energy dissipation connector 4, and one or more energy dissipation connectors 4 (only one energy dissipation connector is shown in the figure) are provided.
In this embodiment, the guard rail is installed on the separate type center partition tape.
In this embodiment the dissipater connector 4 extends through the UHPC panel 1 and dissipater 3 and into the base 2, the dissipater connector 4 being located at the top of the fence.
In this embodiment, the energy dissipating connecting member 4 is a metal rod or a metal pipe.
In this embodiment, the UHPC panel 1 is an ultra-high performance concrete structure, and a transverse reinforcing steel bar or a longitudinal reinforcing steel bar is pre-configured in the UHPC panel 1, and the UHPC panel 1 is located on the side of a roadway and used as a first contact member in the event of collision, and first needs sufficient strength and toughness to ensure that the UHPC panel 1 is not damaged too early, and the UHPC panel, the energy dissipation layer 3 and the energy dissipation connector 4 work together to achieve the functions of energy dissipation and guiding.
In this embodiment, the energy dissipation layer 3 can be prefabricated into small sections convenient for transportation, and assembled on the base 2 on site, or temporarily fixed after the UHPC panel 1 is installed, so that the UHPC panel 1 and the base 2 can be used as a pouring template for pouring energy dissipation materials on site, such as polyurethane foam, foam concrete, and the like; no matter the energy dissipation layer is assembled by the prefabricated rear sections or poured on site, the damaged energy dissipation layer 3 can be replaced after collision occurs, and the reliability and effectiveness of the structure are guaranteed.
In this embodiment, the base 2 is a prefabricated reinforced concrete base, the base 2 is prefabricated, and the transverse steel bars 7 and the longitudinal steel bars 8 are arranged in the concrete.
In this example, the thickness of the UHPC panel 1 is 5-10cm, and the thickness of the energy dissipation layer 3 is 8-15 cm.
The construction method of the functionally graded crash barrier of the embodiment comprises the following steps:
s1: the method comprises the following steps of prefabricating a reinforced concrete base 2, a UHPC panel 1 and an energy dissipation layer 3; synchronously reserving pipelines for installing energy dissipation connecting pieces 4 when the reinforced concrete base 2, the UHPC panel 1 and the energy dissipation layer 3 are prefabricated;
s2: mounting a base 2 on a sleeper beam 15, mounting a support block 16 of a central separator;
s3: installing an energy dissipation layer 3 and a UHPC panel 1 on a base 2, then inserting an energy dissipation connector 4, and pouring polyurethane foam into a gap for installing the energy dissipation connector 4;
s4: and filling planting soil 17 between the two guardrails to finish the construction of the functionally graded anti-collision guardrail.
After the construction of the functional gradient anti-collision guardrail is completed, the pavement surface layer 11 or the cushion layer 12 is carried out, and the construction of the whole pavement is completed.
Example 4:
as shown in fig. 4, the functionally graded crash barrier of this embodiment includes a base 2, an energy dissipation layer 3, a UHPC panel 1, and an energy dissipation connector 4, wherein the energy dissipation layer 3 is disposed between the base 2 and the UHPC panel 1, the base 2, the energy dissipation layer 3, and the UHPC panel 1 are connected into a whole by the energy dissipation connector 4, and the energy dissipation connector 4 is provided with one or more (only one is shown in the figure).
In this embodiment, the guard rail is installed on the separate type center partition tape.
In this embodiment the dissipater connector 4 extends through the UHPC panel 1 and dissipater 3 and into the base 2, the dissipater connector 4 being located at the top of the fence.
In this embodiment, the energy dissipating connecting member 4 is a metal rod or a metal pipe.
In this embodiment, the UHPC panel 1 is an ultra-high performance concrete structure, and a transverse reinforcing steel bar or a longitudinal reinforcing steel bar is pre-configured in the UHPC panel 1, and the UHPC panel 1 is located on the side of a roadway and used as a first contact member in the event of collision, and first needs sufficient strength and toughness to ensure that the UHPC panel 1 is not damaged too early, and the UHPC panel, the energy dissipation layer 3 and the energy dissipation connector 4 work together to achieve the functions of energy dissipation and guiding.
In this embodiment, the energy dissipation layer 3 can be prefabricated into small sections convenient for transportation, and assembled on the base 2 on site, or temporarily fixed after the UHPC panel 1 is installed, so that the UHPC panel 1 and the base 2 can be used as a pouring template for pouring energy dissipation materials on site, such as polyurethane foam, foam concrete, and the like; no matter the energy dissipation layer is assembled by the prefabricated rear sections or poured on site, the damaged energy dissipation layer 3 can be replaced after collision occurs, and the reliability and effectiveness of the structure are guaranteed.
In this embodiment, the base 2 is a prefabricated reinforced concrete base, the base 2 is prefabricated, and the transverse steel bars 7 and the longitudinal steel bars 8 are arranged in the concrete.
In this example, the thickness of the UHPC panel 1 is 5-10cm, and the thickness of the energy dissipation layer 3 is 8-15 cm.
The construction method of the functionally graded crash barrier of the embodiment comprises the following steps:
s1: the method comprises the following steps of prefabricating a reinforced concrete base 2, a UHPC panel 1 and an energy dissipation layer 3; synchronously reserving pipelines for installing energy dissipation connecting pieces 4 when the reinforced concrete base 2, the UHPC panel 1 and the energy dissipation layer 3 are prefabricated;
s2: mounting the base 2 in the channel sleeper beam 18 of the integral central division strip;
s3: and installing an energy dissipation layer 3 and an UHPC panel 1 on the base 2, then inserting an energy dissipation connector 4, and pouring polyurethane foam into a gap for installing the energy dissipation connector 4, namely finishing the construction of the functionally gradient anti-collision guardrail.
Claims (10)
1. The functional gradient anti-collision guardrail is characterized by comprising a base (2), an energy dissipation layer (3) and a UHPC panel (1), wherein the energy dissipation layer (3) is arranged between the base (2) and the UHPC panel (1).
2. Functionally graded crash barrier according to claim 1, further comprising an energy dissipating connector (4) connecting the base (2), the energy dissipating layer (3) and the UHPC panel (1) in one piece, the energy dissipating connector (4) being provided with one or more.
3. Functionally graded crash barrier according to claim 2, characterized in that the energy dissipating connector (4) extends through the UHPC panel (1) and energy dissipating layer (3) and into the base (2), the direction of installation of the energy dissipating connector (4) not being parallel to the direction of vehicle impact.
4. Functionally graded crash barrier according to claim 2, characterized in that the energy dissipating connection (4) is a metal rod or a metal tube.
5. Functionally graded crash barrier according to any of claims 1-4, characterized in that the UHPC panel (1) is pre-configured with transverse or longitudinal reinforcement inside.
6. Functionally graded crash barrier according to any of the claims 1-4, characterized in that the energy dissipation layer (3) is a prefabricated or cast-in-place element and the energy dissipation layer (3) is polyurethane foam, metal foam, foamed concrete or metal wave flaps.
7. Functionally graded crash barrier according to claim 6, characterized in that said energy dissipation layer (3) is assembled and combined by multiple segments.
8. Functionally graded crash barrier according to any of claims 1-4, characterized in that the base (2) is a prefabricated reinforced concrete base, a pouring duct (5) for the fixed connection of the base (2) to a bridge or a road being reserved in the base (2).
9. Functionally graded crash barrier according to any of claims 1-4, characterized in that the thickness of the UHPC panel (1) is 5-10cm and the thickness of the energy dissipation layer (3) is 8-15 cm.
10. A method of constructing a functionally graded crash barrier according to any one of claims 2-9, comprising the steps of:
s1: the energy dissipation device comprises a prefabricated reinforced concrete base (2), a UHPC panel (1) and an energy dissipation layer (3); synchronously reserving pipelines for installing energy dissipation connecting pieces (4) when the reinforced concrete base (2), the UHPC panel (1) and the energy dissipation layer (3) are prefabricated;
s2: mounting the base (2) on a bridge or a road;
s3: and installing an energy dissipation layer (3) and an UHPC panel (1) on the base (2), and inserting an energy dissipation connecting piece (4) to complete the construction of the functional gradient anti-collision guardrail.
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| CN202010784028.4A CN111877229A (en) | 2020-08-06 | 2020-08-06 | Functionally-gradient anti-collision guardrail and construction method thereof |
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| CN110714406A (en) * | 2019-10-24 | 2020-01-21 | 南昌大学 | Be applied to precast FRP anticollision barrier that turns to of prestressed concrete bridge roof beam |
| CN110725201A (en) * | 2019-11-18 | 2020-01-24 | 深圳市市政设计研究院有限公司 | Prefabricated assembled light-duty crashproof guardrail that excels in of bridge |
| CN111074768A (en) * | 2020-01-14 | 2020-04-28 | 四川省公路规划勘察设计研究院有限公司 | Template-free rapid construction bridge anti-collision guardrail |
| CN212375764U (en) * | 2020-08-06 | 2021-01-19 | 湖南大学 | Function gradient anti-collision guardrail |
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- 2020-08-06 CN CN202010784028.4A patent/CN111877229A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203247522U (en) * | 2013-05-08 | 2013-10-23 | 中国人民解放军国防科学技术大学 | Road guardrail |
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| CN110714406A (en) * | 2019-10-24 | 2020-01-21 | 南昌大学 | Be applied to precast FRP anticollision barrier that turns to of prestressed concrete bridge roof beam |
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