JPH1088631A - Prefabricated water and hot water supply piping system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the total pipe length and facilitate the construction works at site, by fabricating the loop piping part and the branch piping part connected thereto in a factory by use of flexible piping materials, in water and hot water supply piping on the downstream side of a water meter in a multiple dwelling house or the like. SOLUTION: A loop piping part 1 is formed circlular in a specified diameter by use of a pipe material having a bendability like a polypten pipe on the basis of a piping design drawing in a factory. And branch piping part 4 reaching a shower faucet 2 or a kitchen faucet 3 or the like is branched through Y- shaped or or h-shaped joints 5. And the joints 5 are welded with heat to respective piping parts 1, 4. The loop piping part 1 is formed so as to have about 1-4m in diameter to be easily packed, preferably about 1.2m. Accordingly, in the construction site, the loop piping part 1 is laid on a ceiling or a floor and respective branch piping parts are connected to respective faucets. In this way, sizes of pipe and kinds of joint are reduced and pipes are arranged in the shortest route. And the connection work of the loop piping part 1 and the respective branch pipe parts 4 at the construction site can be omitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prefabricated water supply and hot water supply piping system installed in an apartment house, condominium, dormitory, company house and the like. The present invention relates to a hot water supply piping system.

[0002]

2. Description of the Related Art Generally, a branching method or a header method is adopted for a water supply / hot water supply piping system in a dwelling unit of this kind. The branching method is used for piping with screw connection, and is a method of piping while branching to various faucets such as kitchen faucets and shower faucets. The header method is mainly applied to the piping of a soft-coated copper tube, and is also recently applied to a synthetic resin tube, and is a method of distributing and connecting independently from a water supply / hot water supply header to various faucets. Also, a sheath header construction method is being implemented in which a piping method inserted into a sheath tube and a header construction method are combined.

[0003]

However, in the water supply / hot water supply piping system of the branching method, since the joints are jointed by screws, there is a possibility that water leaks from the threaded portions. In addition, since the branching method generally uses floor piping, if water leaks, it is difficult to find it until it leaks down to the lower floor, and the discovery is delayed. The secondary damage is discovered after it has grown, and the problem has grown. Further, since the floor piping is used, the floor piping cannot be laid unless rainwater curing is performed during the construction of the building frame.
In addition, several types of pipe sizes are required for branch pipes, and the types of joints increase.

[0004] The water supply / hot water supply piping system of the header method has a longer total piping length depending on the position of each faucet such as the shower faucet 2 and the kitchen faucet 3 as shown in FIG. In particular, when the water supply / hot water supply header 11 is installed on a pipe shaft outside a dwelling unit, the total pipe length becomes significantly longer. In addition, there is a restriction on the installation position of the water supply / hot water supply header 11, and a space for inspection and a construction space around the header are required. Further, as in the case of the branching method, several types of pipe sizes are required and there are many types of joints.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem, and a prefabricated type of prefabricated type which can reduce the total pipe length, the number of types of pipes and the number of types of joints can be reduced. It is to provide a water supply and hot water supply piping system. Another object of the present invention is to provide a prefabricated water supply and hot water supply piping system that is excellent in packing, transportability, and on-site workability.

[0006]

According to the present invention, there is provided a prefabricated water supply and hot water supply piping system which is formed in a ring shape with a pipe having flexibility and has a loop water supply point or a hot water supply point in a part of the ring. A branch pipe portion having flexibility and branching from several places of the loop pipe portion and connected to each faucet, wherein the loop pipe portion and each branch pipe portion are heat-sealed through a joint. It is characterized by being joined. The joint is formed in a Y-shape including a straight portion and a forked portion connected to one end of the straight portion, and a loop pipe portion is inserted into one of the forked portions and the straight portion, and the other of the forked portion is inserted into the other portion. Insert the end of the branch pipe section.
Alternatively, the joint is formed in an h-shape including a straight portion into which the loop pipe portion is inserted and a round portion branched from an intermediate portion of the straight portion, and the end of the branch pipe portion is inserted into the round portion. I do.

[0007]

According to the above-mentioned water supply and hot water supply piping system produced in the factory, in the field construction, a loop pipe is laid on the ceiling or the floor, and the loop pipe is connected via a joint from a position close to each faucet. By connecting the branched branch pipe sections to each faucet, pipe sizes and types of joints can be reduced and piping can be performed with the shortest path, and joining work between the loop pipe section and each branch pipe section can be omitted. The loop piping section can be packed in an annular shape and is not bulky, making it easy to transport from the factory to the site. At the time of packing, the branch pipes connected by Y-shaped or h-shaped joints can be parallel to the loop pipes, and can be packed with less bulk.

[0008]

1 and 2 show an embodiment of the present invention.
It will be described based on. FIG. 1 shows an outline of a prefabricated water supply and hot water supply piping system of the present invention, and FIG. 2 shows a side view of a joint used in the piping system. In factory production, a loop pipe 1 having a desired diameter is formed in an annular shape with a pipe material having flexibility, for example, a polybutene pipe, based on a pipe design drawing, and a shower faucet 2, a kitchen faucet 3 and the like of the loop pipe 1 are formed. The branch pipe section 4 is branched via joints 5 from locations close to the respective faucets. The diameter of the loop pipe 1 is 10 mm or 13 mm, and the diameter of the branch pipe 4 is 10 mm or 13 mm, which is the same as that of the loop pipe 1. The annular size of the loop pipe section 1 is a size that is easy to pack, and has a diameter of about 1 to 4 m, more preferably about 1.2 m.

As shown in FIG. 2A, the joint 5 is formed in a Y-shape comprising a straight portion 5a and a forked portion 5b connected to one end of the straight portion 5a. The joint 5 inserts one of the straight part 5a and the forked part 5b into the loop pipe part 1 corresponding to a position close to each faucet, and the end of the branch pipe part 4 to the other of the forked parts 5b. (B) of the same figure shows another embodiment of the joint 5. This joint 5 is formed by heat-sealing a T-shaped joint 6 and an elbow joint 7 to form a straight portion 5a and an intermediate portion of the straight portion 5a. And an R-shaped portion 5c branched from the H-shaped portion. Also in this case, the joint 5 inserts the straight portion 5a on the loop pipe portion 1 corresponding to a position close to each faucet, and inserts the end of the branch pipe portion 4 into the round portion 5c. Regardless of the shape of the joint 5, the joint between the pipes 1, 4 and the joint 5 is a low-cost, highly reliable heat-sealing without water leakage. Joint 5 is Y
By forming it into a letter shape or an h-shape, the loop pipe part 1 and the branch pipe part 4 can be easily packed in a ring shape even in the case of packing. The forked portion 5b or the rounded portion 5c has a shape with little frictional resistance against water flow. The position of the water supply point or hot water supply point 10 connected to the loop pipe section 1 is determined by using FIG.
There are no restrictions from the experimental results and simulation results shown in FIG. When the loop piping section 1 is for hot water supply, an electric water heater 9 is provided as shown by a two-dot chain line in FIG. When the loop pipe section 1 is used for supplying water, the electric water heater 9 is unnecessary. In the on-site construction, the loop piping section 1 may be laid on the ceiling or laid on the floor. However, it is preferable because the ceiling is less likely to be damaged than the floor due to the curing of the piping during construction.

Outline of the experiment The water supply and hot water supply piping system of the present invention shown in FIG. 1 (Example 1: The pipe diameter of the loop pipe 1 and the branch pipe 4 is 10 mm,
Example 2: Loop pipe section 1 and branch pipe section 4 have a pipe diameter of 13 mm and loop pipe section 1 have a diameter of 1.2 m.
In the piping system of the conventional header method shown in FIG. 8 (comparative example: piping diameter of 10 mm) and a typical apartment dwelling unit model (3LDK: 82.5 m ² ) shown in FIG. Then, using the prefabricated actual model piping, confirm the basic performance experiment and test construction status. FIG. 3 shows equipment and members used in the experiment and design conditions.

(1) Flow rate and temperature at the time of simultaneous use of faucets In the case of simultaneous use of shower faucet 2 (two-valve type) and kitchen faucet 3 (single lever mixing), the required flow rate of each faucet 2, 3 The temperature is measured, and fluctuations in the flow rate and temperature of the shower faucet 2 due to opening and closing of the kitchen faucet 3 are confirmed. The experimental procedure is as follows.
n) and the temperature (40-42 ° C.), the kitchen faucet 3 is set to a predetermined flow rate (8-10 L / min) and temperature (38-4
Check the fluctuation of the flow rate and the temperature of the shower faucet 2 when the temperature is set to 0 ° C).

(2) Hot Water Waiting Time When the shower faucet 2 and the kitchen faucet 3 are used independently, the hot water supply side is fully opened, and the time and temperature until the hot water set temperature is discharged is measured. The time required for the discharge temperature from the faucet to reach 30 ° C. in each piping system is compared.

(3) Water hammer Kitchen faucet 3 is quickly closed and the pressure at that time is measured. The pressure sensor was attached near the kitchen faucet 3 and the washing faucet remote from the kitchen faucet 3.

Experimental Results (1) Flow Rate and Temperature when Simultaneously Using the Faucet FIG. 4 shows the measurement results of the flow rate and temperature when the faucet is used simultaneously for each piping system. The flow rates of the piping system of the present invention (Examples 1 and 2) and the header piping system (Comparative Example) both satisfied the target flow value of the BL standard. Regarding the temperature, a temperature variation of about 3 to 5 ° C. is observed irrespective of each piping system. In consideration of safety, it is desirable to install a thermostatic faucet when using an electric water heater.

(2) Hot water waiting time FIG. 5 shows hot water waiting time of each piping system. The permissible hot water waiting time greatly differs depending on human sensations, and it is expected that the same person will differ depending on time and case. There is no clear data on hot water waiting time. According to a survey by Tokyo Gas, in the case of hot water with a discharge temperature of 30 ° C and a waiting time of 19 seconds, 8
Judging from the results of the questionnaire that 0% of people do not feel inconvenience, the piping system of the present invention (Examples 1 and 2)
Is discharged in hot water of 30 ° C. in about 20 seconds similarly to the header piping system (comparative example), so there is no problem in usability.

(3) Water hammer FIG. 6 shows the results of water hammer measurement in each piping system. The water hammer pressure of the piping system of the present invention (Examples 1 and 2) was 5 kgf / cm ² or less as in the case of the header piping system, and no problematic pressure value was confirmed. This is presumably because the polybutene pipe itself constituting the loop pipe section 1 and the branch pipe section 4 absorbs the water hammer pressure. Moreover, it was found that the water hammer pressure of the piping system of the present invention (Examples 1 and 2) was smaller than that of the header piping system (Comparative Example). FIG. 7 shows the results of measuring the discharge flow rates of the shower faucet 2 and the kitchen faucet 3 both individually and simultaneously.
Shown in Water supply point 10 is near the shower faucet (water supply point A)
When compared at a distant point (water supply point B), it was confirmed that there was almost no effect on the water discharge performance of the faucet.

From the above experimental results, in the evaluation of the flow rate and temperature, the hot water waiting time, and the basic performance of the water hammer when the faucet is used at the same time, the piping system of the present invention (Examples 1 and 2) uses the header piping system (Examples 1 and 2). It was confirmed that a result not inferior to Comparative Example) was obtained.

Basic performance experiments were performed on the pipe diameters of the loop pipe section 1 and the branch pipe section 4 of 10 mm and 13 mm. As a result, it was confirmed that the target value of the BL standard was satisfied regardless of the pipe diameter. It is preferable to select a pipe diameter of 10 mm in consideration of reduction in size. In consideration of the packing form and workability of the prefabricated pipe, the diameter of the loop pipe 1 is desirably about 1.2 m. According to the loop pipe section 1 having a diameter of about 1.2 m, it is laid on the ceiling or floor at the time of on-site construction,
From now on, since it is possible to connect to each faucet with the shortest route in the branch pipe section 4, there is no restriction on the space and position of the water supply / hot water supply header 11 as in the header pipe system, and the total pipe length is shortened. It was confirmed that it was excellent in cost reduction, packing property and on-site workability.

[0019]

According to the present invention, the total piping length per dwelling unit can be shortened, and the cost is reduced, and the packing and the on-site workability are excellent. In particular, in terms of on-site workability, a header space such as a header piping system and a fixture for the header are not required, and the work can be performed only with the pipe support material. The joint between the loop pipe section and the branch pipe section and the joint employs heat fusion, so that the reliability is high. The prefabrication eliminates the heat fusion joint on site and improves workability. As for hot water waiting, after using one of the faucets, the hot water rises immediately when another faucet is used. The pressure of the water hammer is smaller than that of the header method. In terms of packability, the loop pipe section is easy to pack in an annular shape, and the branch pipe section joined via a Y-shaped or h-shaped joint is also annularly less bulky and compactly packed along the loop pipe section. It is advantageous.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a water supply and hot water supply piping system of the present invention.

FIGS. 2A and 2B are side views of a joint of the water supply and hot water supply piping system shown in FIG. 1;

FIG. 3 is a table showing used equipment / members and design conditions associated with the experiment.

FIG. 4 is a table showing measurement results of flow rate and temperature when a faucet is used at the same time.

FIG. 5 is a chart showing hot water waiting time.

FIG. 6 is a table showing a measurement result of a water hammer.

FIG. 7 is a table showing measurement results of a discharge flow rate depending on a position of a water supply point.

FIG. 8 is a schematic diagram of a water supply and hot water supply piping system of a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Loop piping part 2 Shower faucet 3 Kitchen faucet 4 Branch piping part 5 Joint 10 Water supply point

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiaki Yanagidera 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Takashi Takahashi 1-3-3 Moto-Akasaka, Minato-ku, Tokyo No. 8 Kashima Construction Co., Ltd. Tokyo Branch (72) Inventor Chiaki Kaneko 1-3-8 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. Tokyo Branch (72) Inventor Katsuhiko Nishino Nakahara-ku, Kawasaki City, Kanagawa Prefecture 3-29-20 Kamiodanaka (72) Inventor Kazuya Sakata Higashi ▲ Kuzu ▼ Nishi 5-11-20 Edogawa-ku, Tokyo

Claims (3)

[Claims] 1. A loop pipe portion formed of a pipe material having flexibility and having a water supply point or a hot water supply point in a part of an annular portion, and each of the loop pipe portions is branched from several places to form a water faucet. A prefabricated water supply and hot water supply piping system, comprising a branch pipe portion having flexibility connected thereto, wherein the loop pipe portion and each branch pipe portion are joined by heat fusion via a joint. . 2. The joint is formed in a Y-shape including a straight portion and a forked portion connected to one end of the straight portion, and a loop pipe portion is inserted into one of the forked portions and the straight portion, The prefabricated water supply and hot water supply piping system according to claim 1, wherein an end of the branch piping portion is inserted into the other of the forked portions. 3. The joint according to claim 1, wherein the joint comprises a straight portion into which the loop pipe portion is inserted, and a round portion which is branched from an intermediate portion of the straight portion and into which an end of the branch pipe portion is inserted.
The prefabricated water supply and hot water supply piping system according to claim 1, wherein the water supply and hot water supply piping system is formed in a U-shape.