JP2012162903A - Road expansion joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a road expansion joint fixed with impact-cushioning material on both-side fingers with comb teeth-shaped tips opposed to each other across a joint gap, which absorbs a pressing force during expansion or contraction of the fingers due to change in atmospheric temperature and minute vibration during vehicle passage, so that the transmission to the end of a pavement part is inhibited.SOLUTION: A sidewall projecting from an impact-cushioning material is disposed along an external wall surface of the tip and the rear end of fingers and fixed to the external wall surface. A tapered eave having a top face flush with the impact-cushioning material and a tilted bottom face extends from the rear end of the impact-cushioning material and overlaps on a pavement part for bonding.

Description

The present invention relates to an expansion joint for roads in which an impact cushioning material is fixed on both fingers facing each other with comb-shaped tips facing each other with a gap therebetween.

As this type of expansion joint, the one disclosed in Patent Document 1 is known.
This known expansion joint forms a recess by notching the upper part of the opposite end of the spar that forms the expansion / contraction play of the road, and the tip of a pair of comb-like fingers made of steel is contained therein. The expansion joint is installed in the state of facing the gap, and the shock absorber made of rubber or the like is installed and fixed on the upper surface of both fingers, reducing noise and vibration caused by vehicles traveling on the road surface. (See Embodiment 4 in paragraphs [0014 to 0015] and FIG. 4).

However, in this joint, the end surface of the pavement and the rear end surface of the finger made of steel are in direct contact with each other. Therefore, when a finger expands and contracts with a change in temperature, the end surface of the pavement part repeatedly receives the pressing force of the finger. Further, collision and sliding between the paved portion and the rear end portion of the finger are caused due to minute vibration waves generated as the vehicle travels.
Therefore, compressive force and frictional force act on the end surface of the pavement made of concrete or asphalt, cracks and chips occur at the end of the pavement, and a new gap is formed between the pavement and the finger. There was a problem that became a new noise source when the vehicle passed.

JP 2000-248505 A

The present invention relates to a road expansion joint in which an impact cushioning material is fixed on both fingers facing each other with comb-shaped tips facing each other with a gap between them. Another object of the present invention is to suppress the transmission to the end of the pavement by absorbing minute vibrations when passing through the vehicle.

Technical means for solving this problem are as follows: a) Side walls along the outer wall surfaces of the front and rear ends of the fingers are projected from the shock absorbing material and fixed to the outer wall surface; The taper-shaped ridges whose upper surface is flush with the shock-absorbing material from the rear end and whose lower surface is inclined are extended so as to be superposed on the pavement.

In this technical means, since the side walls along the outer wall surfaces of the front end portion and the rear end portion of the finger protrude from the shock absorbing material and are fixed to the outer wall surface, the shock absorbing material is provided on the front end surface of the finger. The top surface and the rear end surface are fixed to each other, and the fixing force is strong. In addition, since an impact buffering material is interposed between the end of the pavement and the rear end of the finger, the pressing force accompanying the expansion and contraction of the finger due to the change in temperature and the minute vibration when passing through the vehicle Is absorbed, and the impact on the end of the paved portion of the finger is absorbed.
From the rear end of the shock-absorbing material, a ridge is attached on the pavement for polymerization adhesion. This kite has a tapered shape with the upper surface flush with the shock absorbing material and the lower surface inclined, so that the vehicle passing over it gradually moves from the pavement to the shock absorbing material and moves on the fingers. Will be reached. This kite functions to cover and protect the end of the pavement.
Therefore, the shock absorbing material suppresses transmission of shocks and vibrations caused by the fingers and the traveling of the vehicle to the end of the pavement.

As the impact buffer material, a highly durable synthetic rubber such as chloroprene rubber can be suitably used.
The thickness of the shock-absorbing material is preferably about 3 to 30 mm, and is designed in consideration of the type of vehicle passing and the amount of traffic.
Moreover, what is necessary is just to select the inclination-angle of the heel lower surface of a shock-absorbing material in the range of 30-60 degrees. If it is too small, the heel becomes too long and the tip of the heel becomes thin and easily peels off due to wear or the like. If it is too large, the heel and the upper surface of the pavement surface portion do not polymerize well. Considering the ease of work for forming the pavement layer, about 40 to 50 degrees is preferable.

As a result of absorbing the pressing force at the time of expansion and contraction due to the heat of the fingers and the minute vibration when passing through the vehicle and suppressing the transmission to the end of the pavement, there is almost no crack or chipping at the end of the pavement There is an advantage, and a gap as a new noise source or vibration source does not occur between the pavement and the finger.

Cross section of road stretch The perspective view of the expansion joint concerning this invention The longitudinal cross-sectional view of the expansion joint concerning this invention Sectional drawing between the expansion-contraction play in other embodiment

FIG. 1 shows a cross section of an expansion / contraction clearance 1 on a road, and shows a state in which an expansion joint 10 is installed in a recess 3 formed by notching the ends of opposite road beams 2 and 2.
The expansion joint 10 is provided with the finger 11 shown in FIG. 2 in the recess 3, and the support rods 12, 12 protruding laterally from the fingers 11, 11 are expanded and contracted using the anchors 4, 4 and the reinforcing bars 5, 5. The joint 10 is fixed to the road beams 2 and 2, and the pavement materials 6 and 6 are filled in the recess 3.
In addition, the code | symbol 8 is an elastic sealing material arrange | positioned so that rainwater etc. may not fall between the fingers 11 and 11. FIG.

The upper portions of the fingers 11 and 11 are covered with impact buffer materials 16 and 16 made of chloroprene rubber having a thickness of 20 mm. The shock absorbing material 16 has side walls protruding along the outer wall surfaces of the front end portion 13 and the rear end portion 14 of the fingers 11, 11, and the front end portion 13 outer wall, the top surface 15, and the rear end outer wall of the fingers. 14 are respectively fixed to the front surface. The shock-absorbing material 16 may be fixed using an adhesive after molding, or may be baked and bonded during molding.

Further, from the rear end of the shock absorbing material 16 (side wall fixed to the outside of the outer wall of the rear end portion 14 of the finger), a tapered ridge 17 whose upper surface is flush with the shock absorbing material 16 and whose lower surface is inclined, 17 is extended. The ridges 17 are bonded onto the corners 7 and 7 of the pavement materials 6 and 6 filled in the concave portion 3 to protect the corners 7 and 7 of the pavement materials 6 and 6.

In addition, in order to prevent the slip of the vehicle passing over the shock-absorbing material 16, it is desirable to form unevenness (not shown) on the surface of the shock-absorbing material 16. It is necessary to design the height, spacing, and shape of the unevenness so that no noise is generated here.

FIG. 4 shows a cross section between the expansion and contraction of the road in another embodiment. In this embodiment, the side walls of the shock absorbing materials 16 and 16 along the tip portions 13 and 13 of the opposing fingers are connected. The joint 10 in which the flange 9 is formed is adopted. Since the eaves 9 are also formed of the same rubber material, it can be adapted to expansion and contraction between roads.
Of course, for draining water from the gap, it is of course possible to attach a separately manufactured gutter between the fingers 11, 11 or between the girders 2, 2.

1 expansion gap, 2 road girders, 3 recesses to install joints, 4 anchors, 5 reinforcing bars, 6 pavement materials, 7 pavement corners, 8 seal materials, 9 mm, 10 expansion joints, 11 fingers, 12 fixed Supporting rod for use, 13 finger tip, 14 finger rear end, 15 finger top, 16 shock absorber, 17 庇

Claims (1)

In an expansion joint for roads, where shock absorbing material is fixed on both fingers facing each other with a gap between them, side walls along the outer wall surfaces of the front and rear ends of the fingers protrude from the shock absorbing material. In addition to being fixed to the outer wall surface, from the rear end of the shock absorbing material, a taper-shaped ridge with the upper surface flush with the shock absorbing material and the lower surface inclined is superposed and bonded onto the pavement. Expansion joint

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