JP6884477B2 - Guard for median strip - Google Patents

Description

The present invention relates to a median guard consisting of blocks suitable for installation as a median strip on narrow roads such as roads, especially tunnels, bridges such as river bridges and viaducts.

Regarding the median strip that is installed as a method of dividing lanes, on wide roads, the width of the median strip is wide enough to install solid concrete blocks so that it can withstand vehicle collisions sufficiently. However, on narrow roads, the median strip cannot be taken wide enough. Therefore, even if a concrete block is installed, it cannot be made sufficiently thick, so it is necessary to attach an anchor to give the installed concrete block strength. However, concrete is used for road repair and accident handling. When driving an anchor to reconstruct a block, it is necessary to drive the anchor to the concrete deck to ensure strength in the bridge, and driving the anchor into the concrete deck will impair the strength of the bridge, which is preferable. Absent.

In the case of a tunnel, since the drainage groove 1 is usually laid under the median strip as shown in FIG. 1, driving the anchor causes damage to the drainage groove 1, which is not preferable.

In the provisional two-lane section where the road width is narrow, rubber poles are often installed at intervals to separate the upper and lower lanes. Since this rubber pole does not require as much mounting strength as the left, even if it is installed in a tunnel or a bridge, it will not damage the concrete deck or the drainage groove 1 of the tunnel shown in FIG. 1, and even if a vehicle hits it. Although it does not cause damage to the vehicle, it does not have a function of suppressing the vehicle from jumping out into the oncoming lane, and may deviate to the oncoming lane side and collide head-on with a vehicle in the oncoming lane.

Patent Document 1 below discloses a protective fence in which sleeves are embedded in a median strip at intervals, columns are inserted into the sleeves to support them, and a cable made of a wire rope is stretched between the columns. There is. This guard fence can be installed even in the provisional two-lane section where the road width is narrow, and it is easy to replace it by repairing by inserting and removing the support, but in order to secure the mounting strength of the support, the sleeve is considerably deep on the road. It needs to be buried up to that point, and when it is installed in a bridge or tunnel, the same problem as described above occurs.

Patent Document 2 discloses a guard fence made of precast concrete installed across the ground cover of the left and right road slabs of the high bridge, but this guard fence is easily separated from the ground cover by contact with a vehicle and faces the ground cover. There is a risk of jumping out to the lane side and causing a contact accident with a vehicle in the oncoming lane.

Patent Document 3 discloses that an anchor nut is embedded in the road surface of the central separation zone, a block incorporating a diagonal line separation mark is installed in the central separation zone, and the anchor bolt is screwed into the anchor nut to fix the block. Patent Document 4 discloses a central separation band wall balustrade which includes a pedestal portion fixed to a floor slab by anchor bolts and a balustrade portion formed of a steel plate and mounted on the pedestal portion. Alternatively, it is not suitable to attach the wall balustrade with an anchor nut driven into the road surface or floor slab for the reason described above, and it takes time to construct. It is undeniable that the width of the road on which vehicles pass is restricted by the blocks.

JP 2011-208491 Japanese Patent Application Laid-Open No. 2008-75359 Japanese Patent Application Laid-Open No. 10-12214 JP 2000-80618

The present invention provides a median strip consisting of blocks that can be easily installed without modifying the concrete deck when constructing a median strip of a road having a pavement layer on a concrete deck. The purpose is to provide.

The invention according to claim 1 is a road composed of a concrete deck and a pavement layer on the deck, and a block installed as a median strip on the concrete deck at appropriate intervals in the longitudinal direction of the deck, and an appropriate interval. It is characterized by connecting adjacent blocks with a cable and forming a cable embedded in the pavement layer.
The invention according to claim 2 is the invention according to claim 1, wherein a horizontal through hole is formed in the block, and the cable is passed through each through hole of the block installed in a line along the median strip. It is characterized in that each block is connected.

The invention according to claim 3 is the invention according to claim 2, wherein the cables are plural, each cable is passed through different parts of blocks arranged in a row in parallel or substantially parallel, and each block is a plurality of cables. It is characterized by being connected by.

According to the invention described in claim 1, the block can be installed by simply placing it on a concrete deck, and it is not fixed by an anchor or the like as in the conventional method, and fixing work to the concrete deck is not necessary. It is easy to install, and it can be installed as a median strip for tunnels, bridges, etc. without any trouble, and since it does not require as much thickness as the left side, it can be installed as a median strip for narrow roads. In addition, the cable that connects the blocks and is buried in the pavement layer functions as an anchor for mounting the block, and even if the vehicle collides with the block, it supports the block in a pulled state from both sides and jumps out to the opposite lane side. Suppress. Moreover, due to the collision of the vehicle, the block tries to be displaced in the collision direction while being supported from both sides by the cable, but at this time, the impact force is absorbed and relaxed, and the damage to the vehicle can be reduced.

According to the invention of claim 2, the block is connected to the cable simply by passing the cable through the through hole, and the connection work with the cable can be easily performed.

According to the invention of claim 3, by passing a plurality of cables in parallel or substantially parallel to the block, the mounting state of the block is stable, and the block is less likely to tilt or fall when the vehicle collides with the block. ..

Sectional view of the tunnel. The plan view of the block used in this embodiment. The same front view. FIG. 4 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a cross-sectional view taken along the line BB of FIG. FIG. 3 is a cross-sectional view taken along the line CC of FIG. Cross-sectional view of the road structure with blocks installed in the median strip. Top view of adjacent blocks connected by a cable. The same front view. The figure which shows the mode when a vehicle collides with a block connected by a cable.

Hereinafter, the guard for the median strip according to the embodiment of the present invention will be described with reference to the drawings.
1 to 5 show a block used for the guard, FIG. 2 is a plan view of the block 11, FIG. 3 is a front view of the block 11, FIG. 4 is a cross-sectional view taken along the line AA of FIG. 2, and FIG. A cross-sectional view taken along the line BB, FIG. 6 is a cross-sectional view taken along the line CC, and FIG. 7 shows a pavement layer 13 such as asphalt formed on the concrete deck 12 after the block 11 is installed on the concrete deck 12. It is sectional drawing of the said block 11.

The block 11 has a thickness of less than 20 mm, for example, has a symmetrical substantially trapezoidal shape as shown in FIG. 3, and has a tapered cannonball shape in the cross section shown in FIGS. 5 and 6 and the side view shown in FIG. I'm doing it. The outer shell is made of steel plate, and as shown in FIG. 4, the reinforcing ribs 14 having a short length and the reinforcing ribs 15 having a long length and having the same cross-sectional shape as the block 11 are alternately arranged inside the hollow. It is fixed. Here, the shape of the block 11 is not limited to the above-mentioned form, and the ribs 14 and 15 also correspond to the shape of the block 11, but the shape and arrangement thereof are not limited.

The left and right side plates 11a shown in FIG. 4 and the reinforcing ribs 14 and 15 shown in FIGS. 4 to 6 constituting the block 11 have one through hole 16 of the same size at the corresponding positions on the left and right sides of the base. It is formed one by one.

In the figure, reference numeral 17 denotes a reinforcing material composed of an angle member 18 and ribs 19 which are fixed to the left and right by welding before and after the block 11 (FIGS. 4 to 7).

In the process of constructing the median strip, first, as shown in FIGS. 8 and 9, blocks 11 are installed on the concrete deck 12 at regular intervals, and then adjacent blocks 11 are placed on both sides of the blocks at regular intervals. A cable 21 made of a wire is passed through the through holes 16 formed in the side plates 11a and the reinforcing ribs 14 and 15, respectively. Although only one set of blocks 11 is shown in FIGS. 8 and 9 for convenience, in reality, as shown in FIG. 10, a large number of blocks 11 arranged in a row are connected by a single cable 21. To. There is a limit to the length of the cable 21, and there is also a limit to the number of blocks 11 connected by one cable 21. Therefore, the blocks 11 arranged in a series are connected by one cable 21 at regular intervals, and another cable 21 is connected to the block 11 at the end of the cable.

In the above embodiment, the block 11 is placed on the concrete deck 12 and then the cable 21 is passed through. However, after passing the required number of blocks 11 through the cable 21, the block 11 is placed on the concrete deck 12 and then the cable is passed through. The blocks 11 may be staggered and arranged at regular intervals on the concrete deck.

Further, in the examples shown in FIGS. 8 and 9, since the cable 21 is passed through the side plate 11a of each block 11 and the through holes 16 of the reinforcing ribs 14 and 15, the cable 21 is formed in the block 11 at the end of the cable 21. Each wire end is connected to the through hole 16 of the rib 15 in parallel by a wire clip or the like, but the end of the cable 21 is inserted into the through hole 16 from the opposite direction and overlapped to be connected, or the block 11 is connected. It is also possible to make the cable 21 in a straight line by connecting the cable ends to both ends of the cable. In this case, through holes 16 may be formed one by one in the side plates 11a and the reinforcing ribs 14 and 15.

In the above embodiment, the blocks 11 arranged in a series along the median strip are connected by one cable, but the cables 21 are individually passed through the pair of through holes 16 in parallel and connected by both cables 21. You may do so. By connecting the blocks 1 with two plurality of cables 21 that are passed through at intervals, the supporting state is stabilized, and it is difficult for the blocks 1 to tilt or fall due to a vehicle collision.

As described above, the blocks 11 are connected by the cable 21 at regular intervals, and the intervals between the blocks are set so that the vehicle cannot pass through. After the blocks 11 are connected by the cable 21, a pavement layer 13 made of asphalt or the like is formed on the concrete deck, whereby the cable 21 is embedded in the pavement layer 13 (FIG. 8).

FIG. 10 shows an aspect when the vehicle 25 collides with the block 11 connected by a single cable installed in the median strip, and the block 11 with which the vehicle 25 collides is pulled by the cables 21 from both sides. In this state, it tries to jump out to the opposite lane, but the jumping out is regulated by another block 11 embedded in the pavement layer 13 and a cable 21 connecting the blocks 11. When the block 11 pulls the cable 21 and pops out at the time of a vehicle collision, the impact force at the time of the collision is absorbed and relaxed, and the damage due to the collision between the block 11 and the vehicle 25 can be reduced.

In the above embodiment, the block 11 is entirely made of steel, but may be formed of precast concrete. In this case, the through hole is formed by burying the pipe when forming the block.

11 ... Block 12 ... Concrete deck 13 ... Pavement layers 14, 15 ... Ribs 16 ... Through holes 21 ... Cable 25 ... Vehicle

Claims (3)

On a road consisting of a concrete deck and a pavement layer on the deck, blocks installed as medians strips on the concrete deck at appropriate intervals in the longitudinal direction of the deck and adjacent blocks are connected at appropriate intervals. A guard for a median strip, which comprises a cable embedded in the pavement layer. Claim 1 is characterized in that a lateral through hole is formed in the block, and the cable is passed through each through hole of a block installed side by side along a median strip to connect the blocks. The guard for the median strip described. The median strip according to claim 2, wherein the cables are plural, each cable is passed through different parts of the blocks arranged in a row in parallel or substantially parallel, and each block is connected by the plurality of cables. Guard for the band.

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