JP2852980B2 - Construction method of asphalt road with buried heating pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an asphalt road in which a plastic pipe for heating to prevent snow melting and freezing is buried. The plastic pipe is improved so as not to cause problems such as crushing and deformation of the plastic pipe.

[0002]

2. Description of the Related Art When constructing an asphalt road on which a plastic pipe for heating used for preventing snow and freezing is laid on a roadbed, first, a wire mesh is laid on the roadbed, and a plastic pipe is laid on the wire mesh. Then, asphalt concrete heated to 150 to 220 ° C. is supplied onto the roadbed by an asphalt finisher, the asphalt concrete is spread and a plastic pipe is buried, and then the asphalt concrete layer is rolled by a roller. 10 to 2 depending on the rolling machine
A method of kneading under a load of 0 ton is known.

[0003]

In the construction work of an asphalt road in which a plastic pipe for heating is buried by the above-mentioned method, the asphalt concrete supplied on the roadbed is first spread and leveled. However, plastic pipes softened by the heat of the supplied asphalt concrete cause problems such as crushing and deformation due to the compaction load, and the use thereof becomes impossible.

The present invention solves such a problem. The purpose of the present invention is to perform asphalt concrete driving operation in a first step using coarse asphalt concrete and a second step using dense or fine asphalt concrete. A heating pipe that has been improved in such a way that the embedded plastic pipe will not be deformed, etc. It is an object of the present invention to provide a method for constructing an asphalt road buried in a road.

[0005]

In order to achieve the above object, a method for constructing an asphalt road having a heating pipe embedded therein, which is a feature of the present invention, comprises laying a wire mesh on a roadbed, and heating the wire mesh on the wire mesh. After piping and fixing the plastic pipe, coarse-grained asphalt concrete is supplied on the roadbed, and the above-mentioned asphalt concrete is spread and laid in such a manner that the plastic pipe is embedded. After preliminarily pressing under load, pressing under normal load of 10-20 tons,
After that, dense or fine-grained asphalt concrete is supplied on the lower layer of the asphalt concrete and spread, and then the upper layer of the asphalt concrete is placed in the lower layer.
It rolls under a normal load of 0 to 20 tons.

[0006] The reason why the preliminary compaction load of the lower layer of the asphalt concrete is set to 1 to 5 tons is that if it exceeds 5 tons, the plastic pipe for heating becomes significantly deformed and the resistance to flowing water increases. There are problems such as a problem that the heating medium does not flow and a deterioration in physical properties of the pipe. Also, if it is less than 1 ton, there is no effect of compaction.

[0007]

First, pebbles, sand, etc., are spread over the ground that has been leveled, compacted, and asphalt concrete (hereinafter simply referred to as ascon in this section) is poured thereon to form a roadbed having a width of 4 m. . Then, as shown in FIG. 1, a grid-like welding wire net 2 is laid on the roadbed 1, and a plastic pipe (in this example, a pipe made of cross-linked polyethylene having an inner diameter of 13 mm and a wall thickness of 2 mm) 3 is placed at intervals of 150 mm. Pipe and fix in a meandering state. Then, as shown in FIG. 2, ascon of coarse grain heated to 180 ° C. is supplied and spread, and the ascon lower layer 4 is laid on the ascon lower layer 4 by a suitable pressing machine.
After the squeezing pressure (primary preliminary squeezing process) with 5 tons of squeezing pressure, 10-20 sq.m.
Rolling is performed with the rolling pressure of the tun (primary rolling process).

After the lower layer 4 of the ascon is cooled sufficiently, as shown in FIG. 3, ascon having a fine or fine particle size heated to 180 ° C. by an asphalt finisher is supplied onto the lower layer 4 of the ascon, and spread. Thereafter, the ascon upper layer 5 is compacted with a macadam roller and / or a tire roller with a compaction load of 10 to 20 tons (secondary compaction process), and the pavement work is completed to construct a road.

In this construction method, in order to protect the plastic pipe 3 in the primary pressing step, it is preferable to spread the coarse-grained ascon by hand using a scoop or the like. As long as there is no fear of damaging 3, the supply of the ascon may use a suitable leveling machine. In both the primary and secondary pressing steps, a cooling medium (cooling water) may be flowed through the plastic pipe in order to increase the deformation strength of the plastic pipe.

[0010]

The present invention is as described above, and the asphalt concrete driving operation is performed in two stages, a primary process using coarse-grained asphalt concrete and a secondary process using dense- or fine-grained asphalt concrete. Preliminary compaction with the smallest possible compaction load is performed in the primary process, which prevents the plastic pipes from unreasonably deteriorating in physical properties and deformation, and hinders the use of heating pipes after the road is completed. Don't worry about coming.
The effect is remarkable when the construction method of the present invention is performed using a pipe having a relatively low softening temperature, for example, a cross-linked polyethylene pipe.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an initial stage of the method of the present invention in which a plastic pipe is fixed on a roadbed.

FIG. 2 is a sectional view showing an intermediate stage of the method of the present invention.

FIG. 3 is a sectional view showing the final stage of the method of the present invention.

[Explanation of symbols]

 1 is roadbed 2 is wire mesh 3 is plastic pipe 4 is asphalt concrete lower layer 5 is asphalt concrete upper layer

Claims (1)

(57) [Claims] 1. A wire net is laid on a roadbed, and a plastic pipe for heating is piped and fixed on the wire net. Then, coarse-grade asphalt concrete is supplied on the roadbed to embed the plastic pipe. The asphalt concrete is spread and leveled, and then the lower layer of the asphalt concrete is preliminarily pressed under a load of 1 to 5 tons, and then pressed under a normal load of 10 to 20 tons. After dense and fine asphalt concrete is supplied and spread on the lower layer, the asphalt concrete upper layer is
A method for constructing an asphalt road with a buried heating pipe, characterized in that it is rolled under a normal load of 0 ton.