CN111335161A

CN111335161A - Foldable guardrail

Info

Publication number: CN111335161A
Application number: CN202010182009.4A
Authority: CN
Inventors: 李莹; 曲佳; 金辉
Original assignee: Taizhou University
Current assignee: Taizhou University
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2020-06-26

Abstract

The invention discloses a foldable guardrail, which comprises guardrail bases (1) fixed on two sides of a bridge floor, a plurality of folding devices (10) arranged on the upper surface of the guardrail bases (1), upright columns (5) arranged between two side plates of the folding devices (10) and connected with the side plates of the folding devices (10) through rotating shafts, and cross beams (6) fixedly connected with the upright columns (5), wherein the upright columns (5) can be placed in the vertical direction and can be laid down when flood occurs. The foldable guardrail has an anti-collision function, and the anti-collision grade can reach SA grade; the method plays an important role in the transformation of the existing bridge guardrail which is easy to be submerged by flood.

Description

Foldable guardrail

Technical Field

The invention relates to the technical field of guardrails, in particular to a foldable guardrail.

Background

The flood belongs to a seasonal strong disaster, the occurrence frequency of the flood is far higher than that of the earthquake, and the interlocking action of the flood aggravates landslide, debris flow, erosion and deposition and the formation of floaters, thereby bringing great harm to roads and bridges and causing great loss.

Many areas experience heavy rainfall to cause serious natural disasters such as flood, and many bridges are completely submerged when the flood comes, and floaters impact the guardrail on the bridge together with the flood, and although the flood can remain after passing the rear bridge, the bridge guardrail is generally seriously damaged, and causes the local chain damage of the connection of the guardrail and the main beam.

In order to reduce the impact of flood to the bridge guardrail, the guardrail should set up to collapsible guardrail, and under the normal condition, the stand is placed along vertical direction, falls the guardrail temporarily when flood, reduces the area of meeting water of guardrail and flood, reduces the influence of flood to the guardrail.

However, the foldable guardrail has poor anti-collision performance, and does not have the capability of resisting collision when a vehicle collides, so that the safety of the vehicle and personnel on the vehicle is extremely unfavorable.

To sum up, how to solve the foldable guardrail structure effectively, and have stronger crashproof performance, thoroughly solve the serious problem of guardrail damage, be the problem that technical personnel in this field need to solve at present.

Disclosure of Invention

The invention aims to provide a foldable guardrail which has the characteristics of simplicity in installation, convenience in operation, low construction difficulty and the like and plays an important role in transformation of an existing bridge guardrail which is easy to flood.

In order to solve the technical problems, the invention provides the following technical scheme:

the utility model provides a folded cascade guardrail, including the guardrail base that is fixed in the bridge floor both sides, install in a plurality of folding device of guardrail base upper surface, install in between the folding device both sides board and with the stand that the folding device curb plate is connected through the pivot, with stand fixed connection's crossbeam, vertical direction can be followed to the stand, can fall the setting during flood.

Preferably, the folding device comprises a flange plate and a side plate fixed on the flange plate, a step surface is arranged on the side plate, a rear baffle is welded at the vertical surface of the step surface, and the stand column is attached to the rear baffle.

Preferably, the folding device is provided with a slot on the lower surface of the step surface, a movable baffle is installed in the slot, and the distance between the movable baffle and the rear baffle is equal to the side length of the upright post.

Preferably, threaded holes are formed in the movable baffle and the upright post, and anti-theft bolts are connected in the threaded holes.

Preferably, through holes are formed in the side plates of the folding device and the upright posts, and bolts are connected in the through holes.

Preferably, the upright post is a square section steel cylinder with the side length of 150mm-170mm and the wall thickness of 6-8 mm; the cross beam is a square steel column with the side length of 100mm-120mm and the wall thickness of 4-6 mm.

Preferably, the guardrail base is formed by pouring reinforced concrete, and the folding devices, the upright posts and the cross beams are made of Q345.

Preferably, the upper surface of guardrail base is higher than the bridge floor, guardrail base with the ring flange of folding device passes through chemical crab-bolt and connects.

Preferably, the upright posts and the cross beam are connected through connecting angle steels and connecting bolts.

Preferably, the surface layers of the folding device, the upright post and the cross beam are coated with anticorrosive coatings.

The foldable guardrail provided by the invention comprises a guardrail base, a plurality of folding devices, upright posts and cross beams, wherein the guardrail base is fixed on two sides of a bridge floor, is arranged along the length of the bridge and penetrates through the length of the bridge, and one side of the bridge is provided. A plurality of folding devices are installed on the upper surface of the guardrail base, and the guardrail base and the folding devices are fixed relatively. The two sides of the folding device are provided with side plates, the upright post is arranged between the two side plates of the folding device, and the two side plates of the folding device clamp the upright post in the middle. The through holes are formed in the side plates on the two sides of the folding device, the through holes matched with the through holes are formed in the lower portion of the stand column, the rotating shaft penetrates through the through holes of the side plates and the stand column, the rotating shaft is fixed at the two ends of the rotating shaft and can be fixed through nuts, pin holes can be formed in the end portion of the rotating shaft, split pins are installed, and the rotating shaft is prevented from being separated from the through holes of the side plates and the.

The stand passes through the pivot with the folding device curb plate and is connected, for rotatable coupling, realizes that the stand rotates around the folding device. The beam is fixedly connected with the upright post and bears vehicle impact together with the upright post. The crossbeam connects many stands together, and the crossbeam rotates around folding device along with the stand.

Under the normal condition, vertical direction can be followed to the stand and placed, before flood comes, can rotate the stand around folding device, and the guardrail is laid down on the bridge floor, reduces the area of meeting water of guardrail and flood, reduces the influence of flood to the guardrail, and flood retreats back guardrail resumable state.

By applying the technical scheme provided by the embodiment of the invention, the stand column is rotated through the folding device, the installation is simple, the operation is convenient and fast, the construction difficulty is small, and the guardrail can be used for reinforcing and transforming the bridge guardrail and is very important for maintaining an old bridge; the guardrail can be laid to the bridge floor side when flood comes, adopts foldable anticollision guardrail, and the anticollision grade can reach the SA level, reforms transform the existing bridge guardrail that easily suffers flood flooding and has an important role, has certain self-protection effect, has reduced the damage to bridge structures, has flood disaster reduction function when crossing the bridge simultaneously.

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 described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of a foldable guardrail provided in an embodiment of the invention;

fig. 2 is another view of the collapsible barrier;

fig. 3 is a three-dimensional view of a collapsible barrier;

fig. 4 is a structural view of the folding device.

The drawings are numbered as follows:

the guardrail comprises a guardrail base 1, a flange plate 2, bolts 3, a rear baffle plate 4, a column 5, a cross beam 6, a movable baffle plate 7, an anti-theft bolt 8, a chemical anchor bolt 9 and a folding device 10.

Detailed Description

The core of the invention is to provide a foldable guardrail which has the characteristics of simple installation, convenient operation, small construction difficulty and the like and plays an important role in the reconstruction of the existing bridge guardrail which is easy to be submerged by flood.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 4, fig. 1 is a schematic structural view of a foldable guardrail according to an embodiment of the present invention; fig. 2 is another view of the collapsible barrier; fig. 3 is a three-dimensional view of a collapsible barrier; fig. 4 is a structural view of the folding device.

In a specific embodiment, the foldable guardrail provided by the invention comprises guardrail bases 1 fixed on two sides of a bridge floor, a plurality of folding devices 10 arranged on the upper surface of the guardrail bases 1, upright posts 5 arranged between two side plates of the folding devices 10 and connected with the side plates of the folding devices 10 through rotating shafts, and cross beams 6 fixedly connected with the upright posts 5, wherein the upright posts 5 are arranged in the vertical direction.

In the structure, the foldable guardrail comprises a guardrail base 1, a plurality of folding devices 10, stand columns 5 and cross beams 6, wherein the guardrail base 1 is fixed on two sides of a bridge floor, the length of the extended bridge is arranged in a through manner, the extended bridge runs through the length of the bridge, and one side of the bridge is provided.

A plurality of folding device 10 are installed in the upper surface of guardrail base 1, and guardrail base 1 and folding device 10 are relatively fixed, specifically can fix through the crab-bolt. The folding device 10 has side plates at both sides, the upright post 5 is arranged between the two side plates of the folding device 10, and the two side plates of the folding device 10 clamp the upright post 5 in the middle. The through holes are formed in the side plates on the two sides of the folding device 10, the through holes matched with the through holes are formed in the lower portion of the stand column 5, the rotating shaft penetrates through the through holes of the side plates and the through holes of the stand column, the rotating shaft is fixed at the two ends of the rotating shaft and can be fixed through nuts, pin holes can be formed in the end portion of the rotating shaft, split pins are installed, and the rotating shaft is prevented from being separated from the through holes of the.

The upright post 5 is connected with the side plate of the folding device 10 through a rotating shaft, and the upright post 5 rotates around the folding device 10 in a rotatable connection mode. The cross beam 6 is fixedly connected with the upright post 5 and bears vehicle impact together with the upright post 5. The cross beam 6 connects a plurality of upright posts 5, and the cross beam 6 rotates around the folding device 10 along with the upright posts 5.

Under the normal condition, vertical direction can be followed to stand 5 and placed, and before flood arrived, can rotate stand 5 around folding device 10, and the guardrail is fallen on the bridge floor, reduces the area of meeting water of guardrail and flood, reduces the influence of flood to the guardrail, and flood retreats back guardrail resumable state.

By applying the technical scheme provided by the embodiment of the invention, the folding device 10 is used for realizing the rotation of the stand column, the installation is simple, the operation is convenient and fast, the construction difficulty is small, and the guardrail can be used for reinforcing and transforming the bridge guardrail and is very important for maintaining an old bridge; the guardrail can be laid to the bridge floor side when flood comes, adopts foldable anticollision guardrail, and the anticollision grade can reach the SA level, reforms transform the existing bridge guardrail that easily suffers flood flooding and has an important role, has certain self-protection effect, has reduced the damage to bridge structures, has flood disaster reduction function when crossing the bridge simultaneously.

On the basis of the above embodiment, the folding device 10 includes the flange 2, and the side plates fixed on the flange 2, that is, the side plates of the folding device 10 are arranged on the flange 2, and the side plates and the flange 2 are welded to form a whole.

The upper end surfaces of the side plates are provided with step surfaces, the vertical surfaces of the step surfaces are welded with a rear baffle 4, and the stand columns 5 are attached to the rear baffle 4, namely the rear baffle 4 is welded with the folding device 10. The rear baffle 4 is arranged at the rear side of the automobile impact direction, and when the automobile impacts the guardrail, the rear baffle 4 generates horizontal supporting force on the upright post 5 to prevent the upright post 5 from inclining or breaking towards the automobile impact direction.

Further optimizing the technical scheme, the folding device 10 is provided with a groove on the lower surface of the step surface, a movable baffle 7 is installed in the groove, and the distance between the movable baffle 7 and the rear baffle 4 is equal to the side length of the upright post 5. The upright post 5 is vertically placed in the normal use process, and when a vehicle collides, the movable baffle 7 and the rear baffle 4 simultaneously generate supporting force in the direction of a drawing, and simultaneously, the movable baffle and the rotating shaft act together to ensure the stability and the strength of the guardrail. Before the flood comes, the movable baffle 7 is taken down, and the guardrail is laid down towards the direction of the bridge floor, such as the laying direction marked in figure 1.

Note that, the inner sides of the flap 7 and the tailgate 4 may have a gap with a set distance from both sides of the pillar 5, and as an installation margin for installing the pillar 5, the flap 7, and the tailgate 4, for example, an installation error of 2mm may be provided on one side, so that the pillar 5, the flap 7, and the tailgate 4 are easily installed.

Furthermore, threaded holes are formed in the movable baffle 7 and the upright post 5, and an anti-theft bolt 8 is connected in each threaded hole, so that the movable baffle 7 is installed on the upright post 5, and the movable baffle 7 is prevented from being stolen. Before the flood comes, the anti-theft bolt 8 is unscrewed, the movable baffle 7 is taken down, and the guardrail is laid down in the laying direction.

According to the foldable guardrail provided by the invention, under the condition that other parts are not changed, through holes are formed in the side plates and the upright posts 5 of the folding device 10, the bolts 3 are connected in the through holes, and nuts are arranged on one sides of the bolts for fixing, so that the bolts 3 are prevented from falling off from the through holes of the side plates and the upright posts. The upright post 5 is connected with the folding device 10 by a bolt 3, and the bolt 3 plays a role of protecting the folding device 10.

In another more reliable embodiment, on the basis of any one of the above embodiments, the upright post 5 is a square steel column, a semicircular structure can be cut below the upright post 5, and a circular hole is drilled in the center of the semicircular structure to connect the rotating shaft. The side length is any value between 150mm and 170mm, including end points, and the wall thickness is any value between 6mm and 8mm, including end points; the cross beam 6 is a square steel column body, the length of the cross beam 6 is selected according to the actual length of the bridge, the side length is any value between 100mm and 120mm, including end point values, and the wall thickness is any value between 4 mm and 6mm, including end point values. The upright post 5 and the cross beam 6 have larger size and stronger crashworthiness. The concrete sizes of the upright post 5 and the cross beam 6 are not limited, and the values can be obtained by calculating the concrete collision avoidance grade according to the actual conditions. And taking a high value when the anti-collision grade is high, and taking a low value when the anti-collision grade is low.

On above-mentioned embodiment's basis, guardrail base 1 passes through reinforced concrete pouring shaping, and intensity is higher, is connected reliably with the girder, is difficult for receiving the flood destruction.

Specifically, the guardrail base 1 can adopt embedded steel bars or utilize original guardrail base 1 steel bars to embed the guardrail base 1 steel plate in advance; pouring concrete of the guardrail base 1, and adjusting the position of the rail embedded steel plate before pouring the concrete of the guardrail base 1; when concrete of the guardrail base 1 is poured and vibrated, the position of a guardrail pre-embedded steel plate is controlled, and the concrete under the guardrail pre-embedded steel plate is required to be fully poured and vibrated tightly; the guardrail folding device 10 can be installed after the concrete of the guardrail base 1 reaches 100% of the design strength.

Meanwhile, the folding device 10, the upright post 5 and the cross beam 6 are made of Q345, so that the strength is high, and the anti-collision capacity of the guardrail is effectively improved.

Specifically, the folding device 10 can be manufactured and inspected in a factory and strictly executed according to the technical requirements of the specified welding process and assembling process. A group of test pieces are selected and inspected on steel according to the same manufacturer, the same material, the same plate thickness and the same delivery state by a plurality of furnaces or batch numbers, 10 percent of each plate thickness is extracted, at least 1 steel is subjected to ultrasonic flaw detection, and unqualified steel is not used.

Lofting and template making are the keys for ensuring the product precision and the making quality, and the allowable deviation of the template making is (+ 0.5-1.0) mm. The sizes of the components are nominal lengths at the reference temperature of 15 ℃, and welding shrinkage allowance and cutting allowance during manufacturing and installation are reserved strictly according to the requirements of construction drawings and process files.

The steel plate mark and thickness should be checked before blanking, and blanking can be performed after no error is confirmed. And (3) pouring out a fillet with the radius R being more than 2mm from the finish-cut exposed edges of all the components to ensure the uniformity of the finish-cut edges and the thickness of the coating at the edges and corners. The arc part of the integral gusset plate must be polished evenly after the fine cutting. The blanking of the main stress member should make the stress direction of the main stress member consistent with the rolling direction of the steel plate as much as possible; during cutting, the swing should be strictly controlled, and the sag and the angle of the groove of the fracture are adjusted to prevent the notch. The gap of the part is not more than 2mm, the gap of not more than 2mm can be smoothly polished by a grinder, and when the gap is more than 2mm, the part is repaired according to a defect repairing method; the steel plate is cut by adopting automatic and semi-automatic cutting, and the allowable deviation of the cutting is 1.5 mm.

During welding and assembling, a construction unit compiles a welding process evaluation test according to a joint form, compiles a corresponding welding process evaluation report, determines a proper welding groove size, a reasonable welding process and welding parameters, and selects effective measures to control welding deformation and reduce welding residual stress. The welding process is the only technical basis for the operation of the welder and must be strictly performed.

The welding deformation and residual stress generated by the structural welding seam are large. In the manufacturing process, on the premise of ensuring the quality of the welding seam, the purity of the welding gas is more than 99.5% by adopting CO2 gas for shielded welding.

The humidity of the welding environment should not be less than 80%, the temperature of the welding environment should not be less than 5 ℃, and the main components should be welded within 24 hours after assembly.

Impact toughness: and selecting corresponding standards according to the actual environment temperature of the area.

When the folding device 10 is assembled, the steel plate of the folding device 10 is welded and integrally formed, the flatness and the precision of the steel plate are ensured, and then the steel plate and the flange plate 2 are welded to form a whole.

For the foldable guardrail in each embodiment, the upper surface of the guardrail base 1 is higher than the bridge floor, so that the folding device 10 can be conveniently installed. The lower extreme of folding device 10 has ring flange 2, has the connecting hole on ring flange 2 and the guardrail base 1, and guardrail base 1 passes through chemical crab-bolt 9 with the ring flange 2 of folding device 10 and is connected, guarantees folding device 10 and guardrail base 1's reliable connection.

On the basis of the specific embodiment, the upright post 5 and the cross beam 6 are connected through the connecting angle steel and the connecting bolt, so that the connection is convenient, and the strength is high. Specifically, the connecting angle steel may be connected to the column 5 by a connecting bolt, and then the beam 6 may be connected to the connecting angle steel by a connecting bolt.

In another more reliable embodiment, on the basis of any one of the above embodiments, the folding device 10, the upright post 5 and the cross beam 6 are coated with anticorrosive coatings to prevent the guard rail from rusting and corroding.

Specifically, all steel components of the guardrail can be subjected to anticorrosion treatment by adopting an epoxy zinc-based polyester composite coating. The thickness of the epoxy zinc-based coating of the fastener is not less than 46 mu m, the thickness of the polyester coating is not less than 70 mu m, and the total thickness of the composite coating is not less than 116 mu m. The thickness of the epoxy zinc-based coating on the outer wall of the upright post 5 is not less than 46 mu m, the thickness of the polyester coating is not less than 70 mu m, the total thickness of the composite coating is not less than 116 mu m, the thickness of the epoxy zinc-based coating on the inner wall of the upright post 5 is not less than 56 mu m, the thickness of the polyester coating is not less than 60 mu m, and the total thickness of the composite coating is not.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The foldable guardrail provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a folded cascade guardrail, its characterized in that, including guardrail base (1) that is fixed in the bridge floor both sides, install in a plurality of folding device (10) of guardrail base (1) upper surface, install in between folding device (10) both sides board and with stand (5) that folding device (10) curb plate is connected through the pivot, with stand (5) fixed connection's crossbeam (6), vertical direction can be followed in stand (5) and placed, can fall the setting during the flood.

2. Foldable guardrail according to claim 1, wherein the folding means (10) comprise a flange (2) and a side plate fixed to the flange (2), wherein the side plate has a step surface, a back board (4) is welded to the vertical surface of the step surface, and the post (5) is attached to the back board (4).

3. Foldable guardrail according to claim 2, characterized in that the folding device (10) has a slot on the lower side of the step surface, a movable baffle (7) is installed in the slot, and the distance between the movable baffle (7) and the back baffle (4) is equal to the side length of the upright (5).

4. Foldable guardrail according to claim 3, characterized in that the mobile baffle (7) and the upright (5) are provided with threaded holes, inside which the anti-theft bolts (8) are connected.

5. Foldable guardrail according to claim 1, characterized in that the side plates of the folding device (10) and the uprights (5) are provided with through holes, in which the bolts (3) are connected.

6. Foldable guardrail according to claim 1, characterized in that the upright (5) is a square steel profile cylinder with side length of 150-170 mm and wall thickness of 6-8 mm; the cross beam (6) is a square steel column body with the side length of 100mm-120mm and the wall thickness of 4-6 mm.

7. Foldable guardrail according to claim 1, characterized in that the guardrail base (1) is formed by reinforced concrete casting, the folding means (10), the uprights (5) and the cross-beams (6) being of Q345.

8. Foldable guardrail according to claim 1, characterized in that the upper surface of the guardrail base (1) is higher than the bridge floor, the guardrail base (1) being connected with the flange (2) of the folding device (10) by means of chemical anchors (9).

9. Foldable guardrail according to claim 1, characterized in that the uprights (5) and the cross-beams (6) are connected by connecting angles and connecting bolts.

10. Foldable guardrail according to claim 1, characterized in that the surface layers of the folding means (10), the uprights (5) and the cross-beams (6) are coated with an anti-corrosive coating.