JPH08277966A - Piping strucutre of flexibile resin pipe - Google Patents

Abstract

PURPOSE: To improve durability of expanding and contracting load by fixing a resin pipe in at least two positions by fixing supporting means, and forming the length of the resin pipe between two fixing support means by a length in which heat schrinkage is taken into amount. CONSTITUTION: A resin pipe 1 which is used in a feed water pipe and the like in a feed water facility and air conditioning facility in a building, is fixed at least two positions, a curving part 1a having a prescribed curbing angle is arranged on the resin pipe 1 between fixing supporting means 3, 3 while taking a heat contraction amount in consideration for absorbing the expandable and contractible load of the resin pipe 1. A free supporting means 2 (2a to 2f) is arranged between the fixing supporting means 3, 3 in order to support the resin pipe 1 in a free condition. The free supporting means 2 is formed of a saddle 4 which is formed in such constitution that a plate shaped part is arranged on both sides of a cylindrical part having an inner diameter larger than the outer diameter of the resin pipe 1, and a base seat 5 which is formed as a flat plate shaped member connected integratedly to the plate shaped member of the saddle 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible resin pipe piping structure, and more particularly to a flexible resin pipe piping structure used as, for example, a water supply pipe, a hot water supply pipe, or a cold / hot water pipe.

[0002]

2. Description of the Related Art In middle- and high-rise buildings such as condominiums, water supply pipes, hot water supply pipes, and cold / hot water pipes are provided as a part of sanitary equipment and air conditioning equipment. As a material for these tubes, a flexible resin tube such as a cross-linked polyethylene tube or a polybutene tube is used.

[0003] This resin pipe is fixed and piped from the viewpoint of the custom from the steel pipe piping construction technique, the appearance after piping and the meandering prevention of the resin pipe. That is, the resin pipe should be passed through, for example, a fixed support having a support portion having an inner diameter substantially equal to the outer diameter of the pipe, and the fixed support should be fixed to the floor, ceiling or wall of the building with anchor pins, nails or the like. Piped by.

At this time, since the resin pipe has a characteristic that the longitudinal elastic modulus is smaller than that of the steel pipe, the resin pipe is piped without using expansion joints. On the other hand, the resin pipe
Since it has a characteristic that the coefficient of thermal expansion is 10 times or more that of a steel pipe, the pipe length expands and contracts depending on the temperature of water or hot water flowing inside the resin pipe.

Further, in the cold district, a gradient pipe for draining water to prevent freezing cannot be implemented as a pipe for giving a required contraction width to the pipes between the fixed supporting devices in advance and bending it in a bow shape.

When the expansion / contraction is large, a large expansion / contraction load is applied to the fixed support, and the fixed support is detached from the floor, the ceiling, the wall or the like, and the resin pipe is lifted. In particular, it is likely to occur around a short branch between the fixed support means 3. In this state, each time a water hammer occurs, the resin pipe vibrates and hits the floor surface or wall surface. The hitting sound at this time is very unpleasant.

As a measure for preventing such a defect,
When installing a straight resin pipe, provide a space more than the required meandering width around the pipe so that the compression / tensile load applied to the fixed support becomes zero, or give the pipe a required shrinkage width during construction and make a bow. The structure is such that it is bent into a curved shape and fixed through a fixed support.

Further, in the piping construction of the resin pipe of the coiled pipe, a slight bending width is applied to the pipe at the time of construction so that the compressive / tensile load applied to the fixed support becomes zero by utilizing the bendability of the coiled pipe. A structure is adopted in which a given contraction width or a necessary contraction width is given to a pipe at the time of construction so as to be fixed through a fixing support tool.

[0009]

However, the conventional flexible resin pipe piping structure requires a lot of time and labor for the work of providing the required meandering width around the pipe or the work of giving the required contraction width to the pipe. However, there is a problem in that the good workability and simplicity of the original resin pipe are impaired. In particular, when the diameter of the resin pipe is large, the compression / tensile load applied to the fixed support becomes large, so that the above-mentioned work becomes very troublesome. Further, it is not possible to use a pipe for giving a required contraction width to the pipes between the fixed support devices in advance and bending it in a bow shape because a gradient for draining water to prevent freezing cannot be taken in a cold region.

The present invention has been made in order to solve the above-mentioned conventional problems, and improves the ease of construction of pipes, the construction quality, and the durability against expansion and contraction loads, and further reduces the construction cost. It is a technical object to provide a piping structure of a flexible resin pipe that contributes.

[0011]

The piping structure of the flexible resin pipe of the present invention adopts the following constitution as means for solving the above technical problems.

That is, in the flexible pipe structure of the resin pipe 1, the resin pipe 1 is fixed by the fixing and supporting means 3 at at least two places, and the resin pipe 1 is fixed between the two fixing and supporting means 3. The length is equal to or greater than the shortest possible piping length between the two fixing and supporting means 3 and a predetermined amount of heat shrinkage, and at least one place between the two fixing and supporting means is The resin tube 1 is supported by free support means 2 that supports it in a free state.

Here, the resin pipe 1 has a bent portion 1a having a predetermined bending angle between the two fixed supporting means 3 and the free supporting means 2 has a curved portion 1a. It is preferable to support the resin pipe 1 on both sides in a non-fixed state.

Further, the shortest possible length of the resin pipe 1 is the length of the resin pipe 1, and when there is no obstacle on the pipe between the two fixing and supporting means 3, a linear distance between them and an obstacle exist. In this case, the shortest distance avoids the obstacle.

Further, in the construction, the piping length in the present invention can always be secured by not considering the above-mentioned shortest length and by taking into consideration the designed thermal contraction amount in addition to the designed piping length.
Further, it is necessary to keep in mind that when the straight line is piped between the fixed points, it is necessary to set the length to be equal to or more than the shortest possible pipe length between the two fixing and supporting means 3 plus a predetermined heat shrinkage amount. There is a need to do. After piping between two points with the shortest length,
This is because if the resin pipe 1 contracts, the contraction cannot be absorbed. However, in the case where the bent portion 1a exists between the two fixing points, it is not necessary to be particularly aware that the length of the resin pipe 1 is equal to or more than the length in consideration of the heat shrinkage amount. This is because the presence of the bent portion 1a naturally makes the length capable of absorbing the shrinkage amount.

From such a point of view, in the present invention, in the flexible resin pipe structure, the fixing and supporting means 3 fixes the resin tube 1 at at least two places, and the fixing and supporting means at the two places. 3, a bend portion 1a having a predetermined bending angle is provided, and the resin tube 1 is supported by the free support means 2 in a free state at at least one location between the two fixed support means. The flexible resin pipe can be regarded as a piping structure. Here, it is more preferable that the free supporting means 2 supports the resin pipe 1 in a free state at two positions on both sides of the bent portion 1a. At this time, it is preferable that the free supporting means 2 is arranged at an equal distance from the center of the bent portion 1a because the expansion and contraction load of the resin pipe 1 is evenly applied with the center as a boundary.

The angle of the bent portion 1a is preferably about 90 degrees, but it may be about 130 degrees.
The point is that there is a margin length that can absorb the amount of heat shrinkage due to bending. The curved portion 1a may be curved in an arc shape with a predetermined radius. Further, the free support means 2 on both sides of the bending portion 1a from the center point of the bending portion 1a.
It is preferable to increase the length in proportion to the increase in the nominal diameter of the resin pipe 1 in order to reduce the load applied to the free support means 2.

The components of the present invention will be individually described below. (Resin pipe) The resin pipe 1 is used as a water supply pipe, a hot water supply pipe, or a cold / hot water pipe in a water supply facility and an air conditioning facility in a building. In the present invention, it is possible to use any flexible resin pipe 1 that has been conventionally used as a water supply pipe, a hot water supply pipe, or the like. For example, cross-linked polyethylene pipe, polybutene pipe, and the like. In addition, it is possible to process into a predetermined length by using various joints such as fusion joints as in the conventional case.

When the resin pipe 1 is used as, for example, a water supply pipe, one end is fixedly connected to a water storage tank or the like, and the other end is fixedly connected to a faucet device or the like. When used as a hot water supply pipe, for example, one end is fixedly connected to a water heater or the like, and the other end is fixedly connected to a faucet device or the like.

(Fixed Support Means) The resin pipe 1 is fixed by the fixed support means 3 at at least two positions.
In this case, the fixing point includes a connecting portion of equipment such as the faucet device and the water heater, a fixing portion that supports the weight of the standpipe, a water load, and the like, and a branch portion in the branch pipe. In such a case, it can be said that the connecting means with the faucet device or the like is also the fixed supporting means 3 in the present invention. When the resin pipe 1 is long, the center of the resin pipe 1 is supported by the fixed supporting means 3 according to the amount of expansion and contraction.
Then, since the amount of expansion and contraction is distributed on both sides, the moving range of the resin pipe 1 is narrowed, which is preferable.

Between the two fixed support means 3, the resin pipe 1 has a bent portion 1a having a predetermined bending angle. The bent portion 1a is for absorbing the expansion and contraction amount of the resin pipe 1. The bent portion 1a may be formed, for example, by bending the linear resin pipe 1 at a predetermined angle, but it is formed as a bend having a predetermined bending angle in that the work of processing the straight pipe is omitted. preferable.

When such a bent portion 1a is provided, the expansion / contraction load of the resin pipe 1 is applied to the bent portion 1a, and the predetermined bending angle changes to absorb the expansion / contraction amount. (Free Support Means) The free support means 2 supports the resin pipe 1 in a free state at at least one location between the two fixed support means 3. In other words, the free support means 2
The resin pipe 1 is supported in a non-fixed state. The free supporting means 2 has, for example, a supporting portion for supporting the resin pipe 1 and a fixing portion for fixing to the floor, ceiling or wall.

The support portion is formed as a saddle 4 having a plate-shaped portion on both sides of a cylindrical portion having an inner diameter larger than the outer diameter of the resin pipe 1, and the fixed portion is integral with the plate-shaped member of the saddle 4. It may be formed from the pedestal 5 which is a flat plate-shaped member connected to the.

In this case, it is preferable that the resin pipe 1 is freely inserted and supported in the saddle 4 in a slidable state in the axial direction of the pipe while the resin pipe 1 is piped. The part and the pedestal 5 are anchor pins, nails, etc. on the floor,
It is preferably fixed to a ceiling or a wall.

In short, the support part is a means for supporting the expanding and contracting resin tube 1 so as to be movable according to the expansion and contraction thereof, and may be supported by hanging it on the wall with a wire, thread, string or the like. Further, the fixing part only needs to support the resin pipe 1 in a good state, and as long as this is the case, the outer peripheral surface of the cylindrical saddle 4 can be brought into contact with the floor surface or the like and fixed.

The free supporting means 2 are arranged on both sides of the bent portion 1a in an appropriate number so as to support the resin tube 1 on both sides. At this time, if the resin pipe 1 is arranged at an equal distance from the center of the bent portion 1a, the resin pipe 1 is demarcated with this center as a boundary.
This is preferable in that the stretching load can be uniformly applied to the free support means 2.

Further, by extending the distance from the center of the bent portion 1a to the free supporting means 2 in accordance with the pipe diameter, the expansion and contraction load of the resin pipe 1 on the free supporting means 2 can be reduced.

[0028]

According to the flexible resin pipe piping structure of the present invention, the resin pipe 1 expands / contracts due to hot water flow. In the case of contraction, the contraction amount is absorbed between the fixed support means 3, and the fixed support means 3 is not subjected to the tensile force accompanying the contraction.

When the resin pipe 1 is expanded or contracted, the free support means 2 supports the resin pipe 1 in a free state. Therefore,
The resin tube 1 can be moved due to the expansion and contraction, and an unnecessary load is not applied to the free support means 2. Therefore,
It is possible to freely design the layout of the supporting means.

Further, the amount of expansion and contraction of the resin pipe 1 is concentrated especially on the bent portion 1a. The bent portion 1 a naturally changes the bending angle as the resin tube 1 expands and contracts to absorb the amount of expansion and contraction of the resin tube 1.

[0031]

Embodiments of the flexible resin pipe piping structure of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a plan view showing a piping structure of a flexible resin pipe according to an embodiment of the present invention. This piping structure comprises a flexible resin tube 1, a free support means 2, and a fixed support means 3. The present embodiment has a piping structure in which the resin pipe 1 can be used as either a hot water supply pipe or a water supply pipe.

<Resin Pipe> The resin pipe 1 shown in FIG.
Is a flexible cross-linked polyethylene tube having a nominal diameter of 16 A (= 16 mm). This resin pipe 1
Is one in which a water heater, a water storage tank, a water meter 20 and the like are connected to one end and a faucet device 21 is connected to the other end, and two bent portions 1a and 1b are formed between one end and the other end. There is. That is, one end of the linear resin pipe 1 is moved upward by about 90 degrees.
To form the bent portion 1a, and the other end side is bent downward at a predetermined radius of about 90 degrees to form the bent portion 1b.
Has been formed. In addition, both of these bent portions 1a and 1b
There is a space of 5m between them. Such a resin tube 1 is supported on the wall surface by a free support means 2 and a fixed support means 3 described below.

<Fixed Support Means> The fixed support means 3 of this embodiment includes one end of the resin pipe 1, a connecting means 3a for connecting a device such as a water tank or a water heater, and the other end of the resin pipe 1. It includes both a connecting means 3b for connecting to a stopper device and a fixed support tool 3c for fixing and supporting the center of the resin pipe 1 and distributing the expansion and contraction amount of the resin pipe 1 to both sides of the fixed point.

Of these, the fixed support tool 3c is a saddle 4 having plate portions on both sides of the cylindrical portion and a flat pedestal 5 which are integrally injection-molded from polypropylene resin. When the plate-like portion of the saddle 4 and the pedestal 5 are overlapped with each other, each has a through hole penetrating the both, and is fixed to the wall surface by a metal screw or the like penetrating the through hole. In this embodiment, the resin pipe 1 has an inner diameter of the cylindrical portion of the saddle 4 and an outer diameter of the resin pipe which are substantially the same, and when the resin pipe 1 is passed through the cylindrical portion, an outer peripheral surface of the resin pipe 1 and an inner peripheral surface of the cylindrical portion of the saddle 4 are formed. Has a gap of 0.2 mm, and the resin pipe 1 is substantially fixed to the saddle 4 in a completely tightened state.
Is fixedly supported on the wall surface.

<Free Support Means> The free support means 2 shown in FIG. 2 has the same structure as the fixed support 3c, but the inner diameter of the cylindrical portion is larger than the outer diameter of the resin pipe 1.
That is, although the saddle 4 and the pedestal 5 are integrally injection-molded with polypropylene resin, the inner diameter of the cylindrical portion of the saddle 4 is larger than the outer diameter of the resin pipe 1, and the resin pipe 1
When it goes through, it becomes a loose fitting state, the resin pipe 1 is free,
It can be inserted and moved freely. In this embodiment, the distance between the outer peripheral surface of the resin pipe 1 and the inner peripheral surface of the cylindrical portion of the saddle 4 is 1.5 mm.
The free supporting means 2 in which the gap of 1 is generated is used.

The free support means 2 as described above is provided with the bent portion 1
Arranged on both sides 2a, 2b of a such that the distance L1 from the center of the bent portion 1a is about 500 mm,
Also, on both sides 2c and 2d of the bent portion 1b, the distance L1 from the center of the bent portion 1b is arranged to be about 500 mm from the center of the bent portion 1b.

The distance from the centers of the bent portions 1a and 1b to the free support means 2 is preferably longer as the nominal diameter of the resin pipe is larger. This relationship is shown in Table 1.

[0039]

[Table 1] When the hot water supply device 20 is connected to the resin pipe 1 in the above-mentioned piping structure through the fixing and supporting means 3, and the hot water is passed through the resin pipe 1 at a temperature of 60 ° C. when the temperature is 20 ° C., the fixing and supporting means 3
The resin pipe 1 between a and 3c extends toward the bent portion 1a due to thermal expansion. Further, the fixed supporting means 3c, 3
The resin pipe 1 between b extends toward the bent portion 1b. During this extension, the resin tube 1 slides on the inner wall of the saddle 4 of the free support means 2 in the direction of the bent portions 1a and 1b. Then, as shown in FIG. 1, the bent portions 1a and 1b change the bending angle to an acute angle to absorb the extension amount of the resin pipe 1. At this time, no compressive load is applied to the free supporting means 2a, 2b, 2c, 2d, 2e and 2f.

In this case, the bent portions 1a, 1b are extended by the fixed support tool 3c of the resin tube 1 in the direction of the free support means 2b and the fixed support device 3c, the free support means 2c.
Absorb 8 mm. The compressive load at this time acts outward on the free supporting means 2a and 2d, and the value thereof is only about 0.02 kgf. On the other hand, when the resin pipe 1 of this embodiment is supported by the fixed support means 3 instead of the free support means 2a to 2f in a completely restrained state, the compressive load acting on the fixed support means 3 is 15.4 kgf. . From this, it is understood that the piping structure of the present embodiment has an effect of reducing the compressive load acting on the supporting means by the extension of the resin pipe 1 to 1/770.

Further, when the resin pipe 1 is connected to the water storage tank 20 through the fixed supporting means 3 and water is passed through the resin pipe 1 at a water temperature of 5 ° C. when the temperature is 20 ° C., the space between the fixed supporting means 3a and 3c. The resin tube 1 thermally contracts in the direction of the fixed supporting means 3a, 3c. The resin pipe 1 between the fixed support means 3c and 3b contracts toward the fixed support means 3c and 3b. At this time, the resin pipe 1 slides on the inner wall of the saddle 4 of the free support means 2 toward the fixed support means 3a, 3c. And FIG.
As described above, the bent portion 1a changes the bending angle to an obtuse angle to absorb the shrinkage amount of the resin pipe 1. Also at this time, as in the case of hot water flow, the free support means 2a, 2b, 2c, 2d, 2e and 2
No contraction load is applied to f.

In this case, the bent portions 1a and 1b are contracted by the fixed support 3c of the resin pipe 1 in the direction of the free support means 2b and the fixed support device 3c and the free support means 2c.
Absorb 5 mm. The contracting load at this time acts inwardly on the free supporting means 2a and 2d, and the value thereof is only about 0.04 kgf. On the other hand, when the free supporting means 2a to 2f are supported by the fixed supporting means 3 in the completely restrained state as described above, the contracting load acting on the fixed supporting means 3 is 15.4 kgf. From this, it is understood that the piping structure of this embodiment has an effect of reducing the contraction load of the resin pipe 1 acting on the supporting means to 1/670.

Further, by adopting this piping structure and the structure shown in Table 1, in the normal temperature use range (0 ° C. to 80 ° C.) of the flexible resin pipe 1, the amount of expansion and contraction of 25 mm bends 1a and 1b. The free supporting means 2a, 2 of the bent portions 1a, 1b in both cases of hot water and hot water.
The expansion / contraction load applied to b, 2c and 2d is 1 kgf or less, which can be kept extremely small. Table 2
Shown in In this case as well, in comparison with the load when the resin pipe 1 is supported in a completely restrained state only by the fixed supporting means 3 at the temperature of 20 ° C., in the case of water passage (0 ° C.), several ten minutes or less In the case of (80 ° C), it becomes 1/100 or less.

[0044]

[Table 2] As described above, according to the flexible resin pipe piping structure of the present embodiment, since the free supporting means 2 or the fixed supporting means 3 is hardly loaded, it is possible to prevent the supporting means 2 or 3 from coming off the fixing surface. As a result, it is possible to eliminate the generation of hitting sound by the water hammer, and
It does not spoil the aesthetics of piping.

When it is used as a hot water supply pipe, the bending portions 1a and 1b absorb the amount of extension of the resin pipe 1 as described above. Therefore, the meandering due to the extension of the resin pipe 1 does not occur. Therefore, it is unnecessary to provide a space corresponding to the meandering width around the resin pipe 1 at the time of piping construction, and it is sufficient to pay attention only to the space outside the bent portion 1b. There is no need to pay attention to the distance.

Further, when used as a water supply pipe, the work of giving a shrinkage width to the resin pipe 1 at each fixing point, which has been done by conventional pipes, can be omitted at all, so that the pipe construction can be simplified.

Although the pipe structure without the branch pipe is illustrated in the above embodiment, when the pipe structure is provided with the connection points with a plurality of faucet devices through the branch pipe as shown in FIG. 3, The branch portion of the branch pipe is connected by a T-shaped joint, but even if this joint is not fixed to the wall surface, since this joint connects the resin pipes in three directions, it is connected to the fixing support means 3d. It can be considered. In this case, the expansion and contraction of the resin pipe 1 moves the joint. At this time, as shown in Table 3, it is preferable that the distance L2 between the free-direction indicating means 2g on the branch side and the branch point 3d by the joint becomes longer as the nominal diameter of the resin pipe 1 becomes larger. . Thereby, it is possible to avoid applying a load to the free support means 2g on the branch side. In this case, the effect of reducing the load has the same effect as described above.

[0048]

[Table 3]

[0049]

As described above, according to the flexible resin pipe piping structure of the present invention, it is possible to improve the simplicity of the pipe construction, the construction quality, and the durability against expansion / contraction load. It can also contribute to cost reduction.

[Brief description of drawings]

FIG. 1 is a plan view showing a flexible resin piping structure according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a free support means used in the piping structure shown in FIG.

FIG. 3 is a plan view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Resin Pipe 1a Bent Part 2 Free Support Means 3 Fixed Support Means 4 Saddle 5 Pedestal

Claims (2)

[Claims] 1. In a flexible resin pipe piping structure, the resin pipe 1 is fixed by at least two fixing support means 3, and the length of the resin pipe 1 between the two fixing support means 3 is fixed. The length is equal to or more than a length obtained by adding a predetermined amount of heat shrinkage to the shortest possible pipe length between the two fixing and supporting means 3, and at least one place between the two fixing and supporting means 3, A flexible resin pipe piping structure, characterized in that the resin pipe 1 is supported by a free support means 2 in a free state. 2. The resin pipe 1 has a bent portion 1a having a predetermined bending angle between the fixed support means 3 at the two positions, and the free support means 2 has the bent portion 1a.
The flexible resin pipe piping structure according to claim 1, wherein the resin pipe 1 is supported in a non-fixed state on both sides of the pipe.