JP3048605U - Flexible joint material for concrete pavement - Google Patents

Abstract

(57) [Summary] Conventionally, a joint material made of plastic and having a projection on a side wall used for concrete pavement has a joint material on a pavement surface due to deformation of the joint material itself due to shrinkage of plastic, expansion or contraction of concrete, and the like. The phenomenon that emerges in
This hinders the running of a car or the like, and causes problems such as impairing the appearance. According to the present invention, a flange portion for preventing protrusion and a width gradually decreasing portion having an easily insertable shape are provided at a lower portion of the surface, so that there is no protrusion and the function can be maintained for a long time. .

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a joint material to be inserted into a pavement layer before the poured concrete is solidified during pavement.

[0002]

[Prior art]

 The volume of concrete expands and contracts due to rising and falling temperatures, drying and wetting. Therefore, when concrete paving is performed over a large area such as a road, an open space, a playground, etc., appropriate joints are provided for a certain area of the pavement surface to absorb expansion and contraction of the concrete volume and prevent cracks from occurring. I have. Conventionally, this joint has been inserted with a wooden board or filled with a sealing material such as asphalt to prevent water, dust, earth and sand from entering. However, wooden boards are not aesthetically pleasing, are not very strong, and are susceptible to corrosion. Sealing materials such as asphalt also melt from the surface due to heat, and are eroded by exposure to wind and rain.Vibration and friction of the pavement surface due to the running of cars and the like also add, and joint materials are lost or dissipated in a relatively short time. It often happens. Therefore, the concrete is hardened by using rubber or flexible plastic, which is harder to corrode than wood and has high mechanical strength, and by forming projections at regular intervals on both side walls of the flat joint material. A joint material with a structure that does not easily emerge on the pavement surface was devised.

[0003]

[Problems to be solved by the invention]

 This joint material surely resists corrosion and erosion, and the entire joint is prevented from floating on the pavement surface. However, after a lapse of two to three years, the joint material itself warps and the upper part of the joint material is generated. It was found that both ends were lifted off the pavement. The main reason for this is considered to be the contraction of the plastic used as the joint material and / or the expansion and contraction of the concrete. Once deformed, the joint material does not return to its original shape, but remains raised on the pavement surface, not only hindering the traveling of vehicles and the like and the walking of facility users, but also has a poor appearance.

[0004]

[Means for Solving the Problems]

 The present inventor conducted various studies on the material and structure of the joint material to obtain a joint material for concrete pavement that can withstand long-term use and does not rise or fall out on the pavement surface. A flexible joint material with a structure that forms a flange along the long axis at the lower part of both side walls and gradually thins from both outer edges of the flange toward the lower end to form a wedge shape achieves its purpose. I found out. That is, the present invention provides: (1) a flat plate (1), a calyx (2) protruding substantially at right angles from both lower side surfaces thereof, and a ridge (4) having a gradually decreasing cross-sectional width from the outer edges (3) of both calyxes. (2) The flexible jointing material for concrete pavement having a gradually decreasing portion (5) for forming a ridge line, (2) the angle between two surfaces forming the ridge line (4) is 20 to 60 °. (3) The joint material according to the above (1), which is made of polyvinyl chloride.

[0005]

[Embodiment of the invention]

 The basic structure of the joint material of the present invention is that a flat plate (1) and a flange integrally formed thereunder are provided, and a triangular portion having a top from the outer edge of the flange, that is, a gradually decreasing width (5). It is made up. The flat plate (1) is usually a horizontally long flat plate having a thickness of 3 to 10 mm, a height of 20 to 80 mm, and a length of about 1 to 5 m. The flange (2) integrally formed with the flat plate (1) protrudes substantially perpendicularly from the side wall, and the length of the protruding portion is about 2 to 7 mm. From the outer edges (3) of the flanges on both sides, a gradually decreasing portion (5) is provided so as to form one ridgeline (4), and a triangle having a cross section whose top is the lower end is formed. The base of the triangle is usually 5 to 17 mm, the height is about 10 to 30 mm, and the apex angle of the triangle is suitably about 20 to 60 °. As a material of the joint material, for example, a plastic having appropriate flexibility such as natural rubber, synthetic rubber, polyvinyl chloride, and polyurethane can be mentioned, and polyvinyl chloride is more suitable. The concrete used for pavement may be the same as that used for pavement of ordinary roads and sports facilities for both the surface layer and the lower layer.

[0006]

【Example】

 Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings, but the present invention is not limited thereto. Example 1 In FIG. 1, (6) is a concrete surface layer and (7) is a lower layer portion such as a crusher run, and the pavement is formed by the (6) and (7). In the pavement, a lower layer (7) is first cast, and it is shaped and compacted, and then a surface layer (6) is cast. The jointing material of the present invention is, for example, a method in which concrete is supported on both sides at the designated location before the surface layer is cast with concrete pieces, and concrete is placed and compacted so that the jointing material is sandwiched from both sides. Pour concrete into the specified height, immediately make a cut with a joint bar to set the joint, remove the joint bar, insert the joint material of the present invention into the joint, and compact the concrete. And buried by a method such as finishing with a power trowel. In this way, after the joint material of the present invention is inserted into the joint of the surface concrete, it is sufficient to wait for the concrete to solidify, and the entire pavement work can be carried efficiently.

[0007]

[Effect of the invention]

 The joint material of the present invention, with the above-described configuration, is only required to be inserted at the time of casting the surface concrete on the pavement and requires no additional work afterwards. Good function and appearance can be maintained throughout. In addition, initial cracks can be prevented by providing joints when placing concrete.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pavement using the joint material of the present invention.

FIG. 2 is a perspective view of the ground material of the present invention.

[Explanation of symbols]

 (1) Flat plate (2) Flange (3) Flange outer edge (4) Ridge line (5) Gradual reduction part (6) Surface layer (7) Lower layer

Claims (3)

[Utility model registration claims] 1. A flat plate (1), a calyx (2) protruding substantially at right angles from both lower side surfaces thereof, and a cross-sectional width is gradually reduced from an outer edge (3) of each calyx to form one ridge line (4). A flexible joint material for concrete pavement having a tapered portion (5). 2. The joint material according to claim 1, wherein the angle between the two surfaces forming the ridge line is 20 to 60 °. 3. The joint material according to claim 1, wherein the joint material is made of polyvinyl chloride.