JP2005336719A - Pavement stone aggregate block having snow melting function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the snow melting function for a pavement stone block so that snow melting work and pavement stone work can be performed at once. <P>SOLUTION: A plurality of pavement stones 3 are fixed by mutually arranging clearance 7 on foundation cloth 2. The foundation cloth 2 is knitted in a grid shape by polyester fiber, and heating conductive paint is applied in advance to the foundation cloth so as to functions a heating element. An electrode 5 is installed on the foundation cloth 2 after painting the conductive paint, and insulating paint is applied to the whole foundation cloth including the electrode so that electricity is not leaked outside. The clearance 7 for paining in a joint material later on, is arranged between a pavement stone and a pavement stone. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pavement aggregate block used for pavement such as a sidewalk or a plaza, which has a snow melting function.

  Conventional pavement construction lays mortar on the foundation concrete and lays the pavement one by one. However, skill required for construction is required and efficiency is not good. Therefore, the applicant previously proposed a paving stone assembly block in which a plurality of paving stones are bonded on a net (utility model registration No. 3047371). This block can be installed on the foundation concrete, and simply by applying joint mortar to the gap between the paving stones and the paving stones, the paving work can be done easily and efficiently.

  By the way, in northern winter, not only the roadway, but also the sidewalks and open spaces are snowed and frozen, and people's traffic is obstructed. For example, cable heaters (electric heating wires) and hot water pipes were embedded to melt snow and ice. However, since the pavement work is performed after the snow melting work, the construction period becomes long and the construction cost becomes high.

  This invention makes it a subject to give a snow melting function to a pavement block so that snow melting construction and pavement construction can be performed at once.

  In the pavement aggregate block according to the present invention, a plurality of pavement stones are bonded on a conductive base fabric with an interval for applying joint mortar, and electrodes are provided on the base fabric. If each pavement aggregate block is too large, it will be too heavy and difficult to transport, so it is realistic that one side is about 500 to 2000 mm.

  The base fabric should have a tensile strength sufficient to hold the paving stones in place and has a low elongation. For example, inorganic fibers such as glass fibers, polyamides including aramid fibers, and organic materials such as polyesters. A fiber cloth can be used. The base fabric is not limited to a woven fabric, and may be a non-woven fabric.

  In the present invention, the base fabric is made conductive. To that end, an electric resistance wire may be woven into the base fabric. However, since the electric resistance wire is easily broken and has a problem of corrosion, it is preferable to apply a heat-generating conductive paint to the base fabric material. It is desirable that the conductive paint has good water resistance, and those containing metal particles such as copper and nickel powder are corroded and cannot be used. Since there are carbon black and graphite as the conductive particles that do not corrode, it is preferable to use those in which these particles are dispersed in a binder (which may be oily or aqueous).

After applying the conductive paint, the electrodes are placed along each of the two opposite sides of the base fabric. The electrode is a copper foil wire or plain woven copper wire, and this is adhered with a conductive adhesive. When a voltage is applied between both electrodes, a current flows uniformly within the area sandwiched between both electrodes and heat is generated. The voltage to be applied is preferably a low voltage (for example, 10 to 20 volts) in order to prevent an electric shock accident. The composition, content, thickness of the coating film, and the like of the conductive particles in the conductive coating are adjusted so that a desired heat generation amount (for example, 20 to 100 w / m ² ) can be obtained at such a low voltage.

  After the electrodes are attached, an insulating paint is applied to the base fabric and the electrodes. The insulating paint preferably has a high water barrier property. For example, a flexible material such as soft polyvinyl chloride, polyethylene, or polypropylene can be used. If a connector is provided at the end of the electrode so that it can be connected to the electrode of the adjacent unit, construction work on site is easy.

  Finally, the pavement is glued on the base fabric. The paving stone can be a variety of natural stones such as granite, concrete boards, bricks, tiles, and wooden boards. The size of each paving stone is, for example, about 100 to 300 mm on a side and about 20 to 50 mm in thickness. It should be noted that when a grid (net) -like material is used for the base fabric, and a felt-like non-woven fabric is applied to the lower side of the base fabric, the base fabric, the paving stone, and the three members of this non-woven fabric are bonded simultaneously, the felt-like Since the nonwoven fabric adheres well to the mortar cement, the block is difficult to peel off from the basic concrete.

  This paving stone assembly block is installed on a mortar for bonding on the foundation concrete. Construction is easy and easy as there is no need to lay paving stones one by one. By applying joint material such as mortar to the gap between the paving stones as usual, each paving stone is firmly fixed. In addition, the electrode of each block is connected to the adjacent one using a connector. The connecting portion is electrically insulated from the surroundings by covering with a heat shrinkable tube such as polyolefin. The heating elements connected to each other are connected to a commercial AC power source.

  This paving stone assembly block with snow melting function has conductivity to the base fabric that supports the paving stone, it generates Joule heat by energizing it, and it is possible to melt snow on the road surface with that heat, By using this, there is an advantage that the snow melting work and the paving work can be performed at the same time, and the construction becomes very short and easy. Moreover, since the paving stone is in direct contact with the heating element, heat is efficiently transmitted to the paving stone, and snow melting can be performed effectively. This collective block can be used for sidewalks, public squares, and house porches.

  As shown in FIG. 1, the pavement aggregate block 1 is a block in which a plurality of pavement stones 3 are fixed on a base cloth 2 by providing gaps therebetween. Here, the size of the assembly block is set to 1000 mm × 2000 mm.

The base fabric 2 is knitted in a grid with polyester fibers, and has a thickness of 3 mm and a mesh size 2 a of about 20 mm × 20 mm. Before bonding the paving stone 3, a conductive paint for heat generation is applied to the base fabric 2 so as to function as a heat generator. Here, a binder (acrylic resin emulsion) in which carbon black and graphite particles are dispersed is used. Application of the paint was actually carried out by the dipping method. Since the thickness of the coating film coming involved in heating value, and to obtain the required thickness with the goal of obtaining an output of 100 watts per 1 m ₂ here.

  The electrode 5 is attached to the base fabric 2 after applying the conductive paint. The electrode was a plain weave copper wire, which was attached along each of the two opposite sides of the base fabric 2. A conductive adhesive was used for pasting. After attaching the electrodes, apply insulating paint to the entire base fabric, including the electrodes, to prevent electricity from leaking outside. A plug-in connector 6 is crimped to the end of the electrode 5.

  Next, the paving stone 3 is bonded onto the base fabric 2. A granite stone plate (size: 200mm x 200mm x 30mm) was used for the paving stone. A gap 7 (for example, a width of 10 mm) is provided between the paving stones to apply the joint material later. Adhesives such as epoxy are used for paving stones. When the paving stone 3 is bonded to the grid-shaped base fabric 2, a felt-like non-woven fabric 9 (polyethylene) having the same size as the base fabric is applied under the base fabric, and this is also bonded together. The nonwoven fabric adheres not only to the base material but also to the bottom surface of the paving stone 3 through the base fabric eyes 2a. Although the felt-like nonwoven fabric itself is not strong, it is fuzzy, so it fits well with the spread mortar 12 (see FIG. 2 described later) and is firmly fixed thereto. Therefore, the paving stone assembly block 1 is spread through the nonwoven fabric 9 and firmly fixed to the mortar 12, and does not peel off over a long period of time.

  The paving stone assembly block made in this way is placed on the pallet from the factory and carried to the construction site. As shown in FIG. 2, in the construction, first, a crushed stone 10 is laid and a foundation concrete 11 is constructed thereon. An adhesive mortar 12 is laid thereon, and the pavement aggregate block 1 is placed thereon so as to press it. The joint mortar 13 is filled in the gap 7 between the paving stone and the paving stone.

  In this way, the paving stone assembly blocks 1 are laid on the sidewalk. Also in the joint between the blocks, make sure that the distance between the paving stones is the same as the others (10mm width), and apply joint mortar here. Moreover, the male female connector 6 of the electrode edge part of each block is connected with the joint of a block, and a heat-shrinkable tube is covered on it, and it electrically insulates. In order to facilitate the connection of the connector, as shown in FIG. 1, only the paving stones 3a at the four corners of the block may be bonded to the base fabric 2 at the end.

  As shown in FIGS. 1 and 2, the edge of the base fabric 2 protrudes out of the paving stone (the protruding portion is indicated by reference numeral 2b). When installing a collective block, the protruding portions 2b of adjacent blocks are overlapped. However, there is no problem even if the protruding amount is made small or zero so that superposition is not necessary.

  FIG. 3 is an electrical diagram, and the assembly blocks 1 in the same row are connected to the heating elements on the surface of the base fabric in parallel and connected to the feeder line 16 led from the switchboard 15. A controller 17 is incorporated in the switchboard, which detects road surface temperature and air temperature, calculates power necessary for melting snow, and controls the switchboard.

It is a fragmentary perspective view of a pavement aggregate block. It is construction state sectional drawing of a pavement aggregate block. It is a heat generating part electrical system diagram of a paving stone block.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pavement aggregate block 2 Base cloth 3 Pavement 5 Electrode 7 Gap between pavement 13 Joint material

Claims (2)

  In the pavement aggregate block in which a plurality of pavements are bonded on the base fabric with a space for applying joint material, the base fabric has conductivity, and each of the two opposing sides of the base fabric has a conductivity. A paving stone assembly block with a snow melting function, characterized by electrodes.   2. The pavement aggregate block having a snow melting function according to claim 1, wherein the base fabric is obtained by applying a heat-generating conductive paint on its surface and further applying an insulating paint thereon.

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