JP2518727Y2 - Road heating pipe - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a road heating pipe which is embedded in an asphalt pavement to flow a heating medium in order to prevent snow accumulation and freezing. is there.

[Conventional technology]

As this type of conventional pipe for road heating, a cross-linked polyethylene pipe used as a pipe for floor heating and hot water supply is known.

FIG. 2 shows an example of a cross section of an asphalt pavement using this crosslinked polyethylene pipe in cross section, and the construction is carried out by the following procedure.

(1) First, pave pebbles, sand, etc. on the ground that has been leveled, roll it, and then level the asphalt and pave it 11
make.

(2) Next, welded wire mesh 12 that is vertically and horizontally combined on the roadbed 11
Lay a pipe cross-linked polyethylene pipe 13 on it,
This is fixed to the welding wire net 12 with a fixing metal fitting (not shown).

(3) After that, asphalt heated to 150 to 220 ° C. is driven in as a surface layer, and after that, it is rolled by a roller. 14 is the asphalt layer thus obtained.

[Problems to be solved by the device]

However, in the case of an asphalt pavement, since the asphalt heated to 150 to 220 ° C. is driven from above the crosslinked polyethylene pipe 13 as described above, there are the following problems.

That is, the cross-linked polyethylene pipe 13 is softened by the heat of the asphalt driven and crushed by a load such as an asphalt finisher. As a result, the heat medium does not flow smoothly through it.

This invention was made in order to solve such conventional problems, and when asphalt is driven,
An object of the present invention is to provide a pipe for road heating which is not softened and crushed by the heat.

[Means for solving the problem]

The pipe for road heating provided by this device is
Weighing 5-100g / on the outer surface of cross-linked polyethylene pipe
It is made by winding a non-woven fabric with m ² and a thickness of 0.05 to 1 mm without gaps.

The standard size of the crosslinked polyethylene pipe has an inner diameter of 10 to 30 mm and a wall thickness of about 1 to 3 mm. The material of the non-woven fabric is a thermoplastic synthetic resin such as saturated polyester, nylon, polypropylene or acrylic resin.

The reason why the weight and thickness of the nonwoven fabric are limited to the above range is as follows.

That is, if the weighing and the thickness are less than 5 g / m ² and 0.05 mm, respectively, the heat insulating effect of the non-woven fabric becomes small, so the heat radiation amount from the pipe surface to the asphalt layer increases, and the snow melting effect and the thawing effect are sufficient. This is because, as expected, the heat of the asphalt cannot be effectively blocked, so the pipe may be softened by the heat and crushed by the load of the asphalt finisher or the like. On the other hand, if each exceeds 100 g / m ² and 1 mm, the heat insulating effect of the non-woven fabric increases, so the heat of the asphalt can be effectively blocked and the crushing due to the softening of the pipe can be effectively prevented. However, the amount of heat radiated from the pipe surface to the asphalt layer is reduced, and the snow melting effect and thawing effect cannot be expected so much.

The preferable ranges of the weight and the thickness of the nonwoven fabric are 10 to 60 g / m ² and 0.1 to 0.5 mm, respectively.

[Action]

The pipe for road heating according to the present invention is wrapped with the above-mentioned weighed and thick non-woven fabric, so that when the asphalt with high heat (150 to 220 ° C) is directly covered with the asphalt pavement, the wrapped non-woven fabric Since it effectively insulates the heat of the pipe and prevents the softening of the cross-linked polyethylene pipe, there is no risk of it being crushed by the load of the asphalt finisher, road roller, tandem roller, or the like.

Further, since the above-mentioned non-woven fabric does not block the heat radiation amount of the heat medium flowing through the cross-linked polyethylene pipe more than necessary, it is possible to effectively prevent snow accumulation and freezing on the asphalt road surface.

〔Example〕

An inner diameter shown in FIG. 1 13Mmfai, outer diameter 17Mmfai, the outer peripheral surface of the crosslinked polyethylene pipes 1 thick 2 mm, the nonwoven fabric f ₁ of Table 1,
Overlap f ₂ and f ₃ by about 5 mm and wrap them in a spiral shape with no gaps, and load pipes P ₁ , P ₂ and P _{3 respectively.}
made.

Different asphalt pavements were constructed using the obtained road heating pipes P ₁ , P ₂ and P ₃ .

Construction was done in the same manner as the asphalt pavement shown in FIG. That is, referring to the figure, a welding net 12 which is vertically and horizontally combined is laid on a roadbed 11 having a width of 4 m, and pipes P ₁ , P ₂ and P ₃ are arranged in a meandering state at intervals of 150 mm. Plumbing,
Drive in asphalt heated to 180 ℃, apply a load of 10 tons with an asphalt finisher, and smooth to a thickness of 80 m.
m asphalt layer 14 was provided.

Nonwoven f ₁ asphalt pavement road heating pipe P ₁ immediately after _{construction, P 2, P 3, f} 2, stripped f _3, deforming the (flatness) measuring the surface temperature of the cross-linked polyethylene pipes 1, a nonwoven fabric The results of Table 2 were obtained when the deformation suppressing effect of was investigated.

The deformation, that is, the flatness E, of the pipe 1 was calculated by the following equation, where a is the short axis and b is the long axis of the pipe 1 having a circular cross section.

In addition, the road heating pipes P ₁ , P ₂ and P ₃ on the asphalt pavement after construction have an outside temperature of 0 ° C and a snowfall intensity of 1 cm / h.
The asphalt layer 14 by supplying hot water at 50 ℃ for 10 hours.
The surface temperature and the amount of heat radiation were measured and the snow melting effect of the asphalt pavement was examined, and the results shown in Table 3 were obtained. The heat radiation amount was calculated by the following equation.

For comparison, an asphalt pavement was constructed using a cross-linked polyethylene pipe 1 on which a non-woven fabric was not wound, and the same items as those in the above-mentioned example were measured and evaluated.

As is clear from Tables 2 and 3, the nonwoven fabrics f ₁ and
It is understood that f ₂ and f ₃ are effective in suppressing the deformation of the cross-linked polyethylene pipe 1 during the construction of the asphalt pavement, and have no hindrance in melting the snow on the asphalt pavement after the construction.

[Effect of device]

As described above, since the pipe for load heating of the present invention is constructed by winding a non-woven fabric having a certain weight and thickness around a cross-linked polyethylene pipe without gap, when the asphalt is driven, it is softened by the heat. There is no danger of being crushed by the load of an asphalt finisher.

[Brief description of drawings]

1 shows a load heating pipe according to an embodiment of the present invention. FIG. 1 (a) is a front view, FIG. 1 (b) is a side view, and FIG. 2 is a conventional load heating pipe. It is a sectional view of an asphalt pavement. 1 ... Cross-linked polyethylene pipe f ₁ , f ₂ , f ₃ …… Non-woven fabric P ₁ , P ₂ , P ₃ …… Road heating pipe

Claims (1)

(57) [Scope of utility model registration request] 1. A pipe for load heating, which is obtained by winding a non-woven fabric having a weight of 5 to 100 g / m ² and a thickness of 0.05 to 1 mm around the outer peripheral surface of a cross-linked polyethylene pipe without any gap.