JPH0468514B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of connecting pipes and corrugated pipes, and more specifically, to heating systems for snow melting, anti-icing, etc. installed on roads, parking lots, etc. The present invention relates to a method for connecting a corrugated heat pipe and a pipe header that internally circulates hot water or the like serving as a heat source.

[Prior Art] As one of the heating systems installed on roads, parking lots, etc. for snow melting, anti-freezing, etc., corrugated heat pipes 1 containing fluorocarbon gas etc. are conventionally installed at regular intervals as shown in Fig. 5. The corrugated heat pipes 1 are laid parallel to each other on the ground 2 paved with concrete or asphalt, and one end of each corrugated heat pipe 1 is laid on one side of the group of heat pipes. Hot water, gas, etc., which serve as a heat source, are enclosed and circulated. A heating system is used in which the corrugated heat pipe 1 and the pipe header 3 are connected to each pipe 3a of the pipe header 3, and are paved with concrete or asphalt and buried.

In this heating system, the corrugated heat pipe 1 and each pipe 3a of the pipe header 3 are connected by fitting a flange 5 around the outer circumference of one end of the corrugated pipe 1 and brazing it as shown in FIG. On the other hand, each pipe 3a of the pipe header 3
A flange 6 is welded to the outer periphery of the opening end of the corrugated pipe, one end of each corrugated pipe 1 is inserted into each pipe 3a of the pipe header 3, the flanges 5 and 6 are abutted with a sheet packing 7 interposed therebetween, and bolts 8 and nuts are welded. Tighten and connect at 9.

[Problems to be Solved by the Invention] By the way, when the corrugated heat pipe 1 and each pipe 3a of the pipe header 3 are connected by joining the flanges 5 and 6 as described above, the outer diameters of the flanges 5 and 6 are large. Therefore, as shown in FIG. 7, the thickness of the concrete or asphalt 4 must be increased, which not only increases the construction cost but also significantly reduces the heat transfer efficiency. Also, since the flange 5 of the corrugated heat pipe 1 is attached to the outer periphery by brazing,
The strength is weak, and when the corrugated heat pipe 1 bends under a large load on the paved surface, the brazed portion 10 peels off, causing hot water, gas, etc. in the pipe header 3 to leak. Furthermore, when an external force is applied to the flange 5 of the corrugated heat pipe 1 while the corrugated heat pipe 1 is being transported to an installation location such as a road or a parking lot, the heat pipe 1
Because it is flexible, it can easily come off, so care must be taken when transporting it.

In addition, the flange 5 of the corrugated heat pipe 1
The reason why the heat pipe 1 is brazed is that the wall thickness of the heat pipe 1 is approximately 0.5 mm, which is extremely thin, so if the flange 5 is welded, a hole will be made in the heat pipe 1, and special gases such as fluorocarbon gas sealed inside will be able to escape. This is because it leaks.

[Object of the Invention] The present invention has been made to solve the above-mentioned problems, and it is possible to easily and reliably connect a corrugated heat pipe and a pipe of a pipe header over a seal, without using a flange connection. Moreover, it is an object of the present invention to provide a method for connecting a corrugated pipe to a public office, which prevents hot water, gas, etc. from leaking from the pipe of the pipe header even if the corrugated heat pipe is bent.

[Means for Solving the Problems] A method for connecting a pipe and a corrugated pipe according to the present invention to solve the above problems involves inserting one end of a corrugated pipe from the end of a pipe that encloses liquid or gas. When connecting pipes and corrugated pipes,
A string-like packing formed into a coil is wound around the outer periphery of a corrugated pipe, and the coiled packing is wrapped in a packing case.A case housing is fitted around the outer periphery of the packing case. is screwed onto the outer periphery of the end of the tube, and the packing case is pressed toward the end of the tube, and the coiled packing is compressed from the front and rear ends, and the outer circumferential surface becomes the packing case and the inner circumferential surface is corrugated. The method is characterized in that the pipe is pressed uniformly in the axial direction of each pipe to seal between the end face of the pipe and the corrugated pipe, thereby connecting the pipe and the corrugated pipe.

[Function] As described above, since the method of connecting a pipe and a corrugated pipe of the present invention is performed without using a flange, the outer diameter of the connecting part becomes small, and the concrete or asphalt of the installation part of the pipe and corrugated pipe becomes small. It is possible to reduce the thickness of the pavement, increase heat transfer efficiency, and improve construction efficiency. In addition, even if the corrugated pipe connected to the pipe bends due to a large load being applied to the pavement surface, the connection part is completely sealed by the coiled packing, so the liquid or gas contained in the pipe will not leak. . Furthermore, since the connection between the pipe and the corrugated pipe can be assembled on-site, handling of the corrugated pipe during transportation becomes easier.

[Example] An example of a method for connecting a pipe and a corrugated pipe according to the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a corrugated heat pipe containing a fluorocarbon gas, etc., which are laid in large numbers in parallel at regular intervals on a ground 2 paved with concrete or asphalt, such as a road or parking lot. 3 is a pipe header, which is attached to the side of the first group of corrugated heat pipes. Connect one end of each corrugated heat pipe 1 to each pipe 3a of the pipe header 3.
When inserting and connecting from the open end of each corrugated heat pipe 1, a string-like packing 1 formed in a coil shape as shown in FIG.
1 is wound and fitted, the coiled packing 11 is brought into contact with the tip surface of the packing presser 12 at the open end of each pipe 3a of the pipe header 3, and the coiled packing 11 is wrapped in the packing case 13. Then, fit the seal case 13 together with the O-ring 14 into the narrow diameter part 12a at the tip of the seal presser 12, fit the case housing 15 around the outer periphery of the seal case 13, and then
Screw the screw 15a provided on the front inner peripheral surface of the seal holder 12 into the screw 12b on the outer periphery of the seal holder 12, press the seal case 13 toward the seal holder 12, compress the O-ring 14, and close the seal case 1.
3 and the narrow diameter part 12a of the packing holder 12, and compressing the coiled packing 11 with the tip surface of the packing holder 12, the coiled packing 11 is attached to the inner periphery of the packing case 13. The surface of the corrugated heat pipe 1 is in close contact with the outer peripheral surface of the corrugated heat pipe 1 and the tip end surface of the packing holder 12 to seal between the outer periphery of the corrugated heat pipe 1 and the inner periphery of the packing holder 12. Connect each pipe 3a of the pipe header 3.

Above the corrugated heat pipe 1 and pipe header 3 connected in this way, concrete or asphalt 4 is paved and buried as shown in FIG. 3, and a heating system is installed.

The heating system created in this way supplies hot water (or gas) to the pipe header 3 during the cold season and circulates it, thereby enclosing it in the corrugated heat pipe 1 connected by inserting one end into each pipe 3a. Heat transfer occurs due to the phase change of the fluorocarbon gas, which warms the concrete or asphalt 4, and melts snow and prevents freezing of the paved surface.

In order to prevent snow melting and freezing on the paved surface, the corrugated heat pipe 1 and each pipe 3a of the pipe header 3 are connected without using a flange, and the outer diameter of the connection part is the same as that of the pipe 3 of the pipe header 3.
Since the diameter is approximately the same as that of a and is much smaller, the thickness of the concrete or asphalt 4 pavement is thin, and the heat transfer efficiency is high. Therefore, snow melting and antifreezing effects on the pavement surface are extremely effective.

Moreover, since the concrete or asphalt 4 pavement thickness is thin, construction efficiency is improved and construction costs are reduced.

In addition, even if the corrugated heat pipe 1 connected to the pipe 3a of the pipe header 3 bends when a large load is applied to the paved surface, the connection part is completely sealed by the coiled packing 11, so that the hot water circulating in the pipe header 3 (or gas) will not leak. Furthermore, since the connecting portion between the corrugated heat pipe 1 and the pipe 3a of the pipe header 3 is assembled on site, handling of the corrugated heat pipe 1 during transportation becomes easy.

In the above embodiment, the corrugated heat pipe 1 and each pipe 3a of the pipe header 3 are connected, but the present invention is not limited to this.
It can be applied to the connection of various corrugated pipes and straight pipes.

[Effects of the Invention] As can be seen from the above explanation, the method for connecting pipes and corrugated pipes according to the present invention can be used to connect each corrugated heat pipe and each pipe of a pipe header in heating systems for roads, parking lots, etc. If applied, since no flanges are used, the outer diameter of the connection part can be reduced, the thickness of the concrete or asphalt pavement can be made thinner, the heat transfer efficiency can be increased, and the snow melting and anti-icing effects on the pavement surface can be extremely effective. be carried out effectively. Moreover, since the pavement thickness can be reduced, construction efficiency is improved and construction costs are reduced.

Furthermore, even if the corrugated pipe connected by the method for connecting a pipe and corrugated pipe according to the present invention is bent by an external force, the connecting portion is completely sealed by the coiled packing, so there is no leakage of liquid or gas.

Furthermore, since the connections of the corrugated pipes are assembled on site, it is not necessary to prevent the flanges from coming off when transporting the corrugated pipes, as is the case in the past, and handling is simple.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the main parts of a heating system for melting snow and preventing freezing of roads, parking lots, etc., to which the method of connecting pipes and corrugated pipes according to the present invention is applied;
Figure 2 is an enlarged vertical side view showing how the corrugated heat pipe and the pipe header are connected in the heating system, and Figure 3 shows the connected corrugated pipe and pipe header being paved with concrete or asphalt. Fig. 4 is a longitudinal side view showing the condition, and Fig. 4 is a plan view of the main part of a heating system for melting snow and preventing freezing on roads, parking lots, etc., using the conventional connection method of pipes and corrugated pipes. Fig. 6 is an enlarged vertical side view showing the method of connecting the corrugated heat pipe and the pipe header in a heating system, and shows the connected corrugated heat pipe and pipe header with concrete or asphalt paved over them. FIG. 1... Corrugated heat pipe, 2... Ground to be paved, 3... Pipe header, 3a... Pipe, 11... Coiled packing, 12... Packing holder, 13... Packing case, 15... Case housing .

Claims (1)

[Claims] 1. When connecting a corrugated pipe by inserting one end of a corrugated pipe from the end of a pipe that encloses a liquid or gas, a string-like packing formed in a coil shape is wrapped around the outer circumference of the corrugated pipe and fitted. The coiled packing is wrapped in a packing case, a case housing is fitted around the outer periphery of the packing case, and the case housing is screwed onto the outer periphery of the end of the pipe, so that the packing case is attached to the pipe. The coiled packing is compressed from the front and rear ends, and the outer circumferential surface is pressed against the packing case, and the inner circumferential surface is pressed against the corrugated pipe evenly in the tube axis direction, so that the end surface of the tube is compressed. A method for connecting a pipe and a corrugated pipe, characterized by sealing between the pipe and the corrugated pipe and connecting the pipe and the corrugated pipe.