JP2013217383A - Flexible tube and piping structure for sprinkler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide (1) an aluminum composite resin pipe for a sprinkler piping, having a small equivalent pipe length value to be laid for a long distance, four meters or more, and having sufficient flexibility so as to easily be laid in a complex shape, and to provide (2) a piping structure for a sprinkler of high efficiency.SOLUTION: A resistance value of a water flow in a joint portion is reduced by expanding a diameter of an end of at least one of a main pipe joint and a sprinkler nozzle of an aluminum composite resin pipe. By using the aluminum composite resin pipe, a piping structure for a sprinkler with reduced number of metal main pipes and reduced branch pipes can be obtained.

Description

  The present invention relates to a flexible tube and a sprinkler piping structure using the flexible tube.

Sprinkler facilities that sprinkle large amounts of water for initial fire extinguishing are installed in many buildings. A water supply pipe is connected to the sprinkler nozzle in the sprinkler equipment. In sprinkler equipment installed on the ceiling, the water supply pipe is installed on the back of the ceiling, so that the connection from the water supply pipe to the sprinkler nozzle is made so as not to interfere with other equipment such as ducts, cable racks, and electric wires installed on the back of the ceiling. It will be processed into a complicated shape and piped.
Conventionally, this pipe is a fixed pipe in which a metal pipe and a joint are combined. However, it was necessary to determine the dimensions at the construction site and cut and process the water supply pipes, resulting in high material costs and labor costs for the piping work.

In order to reduce material costs and labor costs, it has been considered to use metal flexible tubes with joints at both ends. For example, in a metal flexible tube shown in Patent Document 1, both ends of a stainless steel corrugated tube are integrated with a joint for connecting one to a water supply pipe and the other for connecting a sprinkler nozzle. Therefore, it is possible to bend and pipe a complicated shape by hand without using a tool, and the material cost and labor cost can be greatly reduced. Moreover, it was a sufficiently thick metal tube with flexibility, and was able to meet the requirements of sprinkler equipment in terms of securing the flow rate and pressure resistance.
However, the metal flexible tube has the following problems. Since the tube surface is corrugated for the purpose of providing flexibility, the fluid resistance when water passes through the tube is large. For this reason, an equivalent pipe length value will become large. Equivalent pipe length value based on the capacity and cost of fire fighting pumps, emergency power supply capacity and cost, especially equivalent pipe length value in terms of pipe nominal diameter 20A in a water flow of 80 liters per minute (hereinafter simply referred to as “equivalent pipe length”) It is difficult to use a metal flexible tube having a length of 4 meters or more.
In addition, since the pressure resistance is given by processing the thin wall of around 0.3mm into a wave shape, it is easy to cause a damage accident if an unexpected large force is applied near the joint with a smaller bending radius. To do. After construction work, workers from other industries accidentally damaged metal flexible tubes and neglected to report to the person responsible for construction, so there were not a few accidents in which a large amount of water leaked suddenly.
In addition, other contractors perform welding work near the metal flexible tube, and when a high-temperature spark containing metal components scattered at that time comes into contact with the thin stainless steel tube of the metal flexible tube, this part Melts into holes, causing water leakage accidents. For plumbing contractors as well as metal flexible pipes, there is always a possibility of water leakage at the connection points of pipes and joints. If water leakage is found after piping work, it does not occur due to increased costs and time for rework. Each company is taking various measures like this, but recently it has become difficult to secure skilled workers, and it has become difficult to maintain the quality of piping work.
In addition, in the Great East Japan Earthquake in 2011, many buildings were damaged by long-term vibration in conjunction with the strength that was not experienced in past earthquakes. Many cases occurred that could not be supported and were damaged or dropped. The building industry is forced to develop higher seismic standards, and sprinkler pipes use a large amount of metal pipe with a large diameter so that a large amount of water can flow at a time in the event of a fire. The weight is considerable, and quick measures are needed to improve its earthquake resistance.

In order to solve the above-mentioned problem, a tube having flexibility other than a metal flexible tube that is not subjected to corrugated processing (crosslinked polyethylene tube, aluminum composite resin tube) is used. It was also possible.
In this case, in order to maintain the prescribed equivalent pipe length value, it was necessary to use a pipe having a diameter equivalent to or larger than a nominal pipe diameter of 20A. In the case of a metal flexible pipe, the pipe and the joint are connected by welding, so the inner diameter of the joint will not be significantly smaller than the inner diameter of the pipe, but in the case of a pipe made of resin, In order to maintain the strength of the joint part, a part of the joint is inserted into the pipe end, so the inner diameter of the joint is smaller than the inner diameter of the pipe, and a larger size is required to maintain a predetermined equivalent pipe length value. This is because it is necessary to use a tube.
Because of this, both the cross-linked polyethylene pipe and the aluminum composite resin pipe are relatively thick and inevitably difficult to bend, and in the case of a cross-linked polyethylene pipe, they return to a straight line. Cross-linked polyethylene pipes and aluminum composite resin pipes are rarely replaced by metal flexible pipes, which are the mainstream means of connecting between water supply pipes and sprinkler nozzles at present in sprinkler pipes due to the difficulty of bending work. Pipes that connect long distances that cannot be reached with metal flexible pipes without considering bending are mainly used.

As described above, a sprinkler pipe that is sufficiently flexible to connect a long distance of 4 meters or more with a small equivalent pipe length value and to enable easy piping to a complicated shape. Was not known.
Further, for example, Patent Document 2 discloses that an efficient sprinkler piping structure is realized using a flexible water supply pipe. However, the length of the flexible water supply pipe is limited, and sufficient effects cannot be obtained.

JP 2004360772 A JP 2000-014822 A

The problem to be solved is an aluminum composite resin pipe that has a sufficiently long length of 4 meters or more with a small equivalent pipe length value and has sufficient flexibility so that it can be easily piped into a complicated shape. It is to provide a sprinkler pipe that can be adopted for a pipe and both ends of the pipe can be integrated with a joint.
Furthermore, it is providing the piping structure for efficient sprinklers which is enabled by using such a pipe | tube.

Conventionally, sprinkler pipes that employ cross-linked polyethylene pipes or aluminum composite resin pipes have used pipes with a pipe nominal diameter of 20 A or larger in order to maintain a predetermined equivalent pipe length value. The request for the equivalent pipe length value for fire fighting is a request for the equivalent pipe length value of the main pipe side joint, pipe, and sprinkler nozzle side joint as a whole. Originally, if the nominal diameter is the same, a cross-linked polyethylene pipe or aluminum composite resin pipe with a smooth inner surface can be made of metal with a larger fluid resistance due to the turbulent flow generated by having a wavy inner surface shape. The fluid resistance value is lower than that of the flexible tube. Accordingly, if the fluid resistance of the joint is not taken into consideration, an equivalent pipe length value equivalent to that of a pipe having a smaller diameter than a metal flexible pipe should be obtained. Here, since the joint is inserted into the pipe, its inner diameter is smaller than that of the pipe, and in view of increasing the equivalent pipe length value of the joint part as a whole, a cross-linked polyethylene pipe having the same nominal pipe diameter as the metal flexible pipe And an aluminum composite resin tube had to be adopted. Then, by expanding the pipe at its end and using a thick joint, it should be possible to use a pipe that is slightly thinner than the equivalent of a nominal pipe diameter of 20A without significantly increasing the total equivalent pipe length. It is. Some pipes that are slightly thinner than the equivalent of the nominal pipe diameter 20A can be easily piped without the need for fixing or bending to prevent them from returning to a straight line.
Based on the above fact, the present invention makes it possible to use a thick joint by expanding a pipe that is slightly thinner than the pipe nominal diameter equivalent to 20A at its end, connecting a long distance of 4 meters or more with a small equivalent pipe length value, Moreover, it is possible to easily perform piping in a complicated shape. Furthermore, the present invention provides an efficient piping structure for sprinklers that is possible by using such a pipe. The specific configuration of the present invention will be described below.

The flexible tube of the present invention is
A flexible pipe used for water supply from a main pipe to a sprinkler nozzle in sprinkler piping,
An aluminum composite resin tube in which an aluminum layer is sandwiched between a synthetic resin inner layer and a synthetic resin outer layer and integrated by adhesion,
The end of at least one side of the main pipe side or sprinkler nozzle side is expanded,
By the pipe expansion, it is possible to use a joint in which the equivalent pipe length value of the joint becomes a sufficiently small value as a joint in a portion for joining the end and the main pipe or the sprinkler nozzle. .
Water flow resistance occurs not only in the flexible tube itself, but also in a joint portion that joins the flexible tube and the main tube and a joint portion that joins the flexible tube and the sprinkler nozzle. Since the joint is fitted into the flexible tube, the effective inner diameter of the joint portion is smaller than that of the flexible tube. According to the applicant's experiment, when the end portion of the flexible tube is not expanded, the fluid resistance value of these two joint portions is so large that it cannot be ignored compared to the fluid resistance value of the flexible tube itself. By expanding the pipe and using a large joint, even if a pipe with a thickness of 20A or more is not used and a slightly thinner pipe is used, if the resistance of the joint is smaller than the flexible pipe itself, a small equivalent While maintaining the pipe length value, a flow rate of 80 liters per minute required for a sprinkler used in a general building or the like can be obtained. In addition, what is necessary is just to design the equivalent pipe length value of a joint and a flexible pipe according to an actual sprinkler installation.
In summary, using a flexible tube with a small diameter that has sufficient flexibility so that bending for piping in a complicated shape is not difficult, connect a long distance of 4 meters or more and secure a flow rate. Thus, it is possible to obtain a small equivalent pipe length value.
Here, the “flexible tube” means a flexible enough to complete the piping by simply connecting the location where the piping is desired without requiring fixing and difficult bending to prevent the tube from returning to a straight line. A tube that has sex. “Tube expansion” refers to a process of expanding the diameter of the end of a tube having a uniform diameter.
The flexible tube of the present invention is an aluminum composite resin tube in which an aluminum layer is sandwiched between a synthetic resin inner layer and a synthetic resin outer layer and integrated by adhesion, and there are various diameters in the aluminum composite resin tube. What is slightly thinner than 20A and has sufficient flexibility is suitable.

The flexible tube of the present invention is
The inner diameter of the unexpanded portion is equivalent to a nominal tube diameter of 16A, and the inner diameter of the expanded end is approximately 3 millimeters larger than the inner diameter of the unexpanded portion.
Here, “equivalent to a nominal tube diameter of 16A” means that the inner diameter of the tube is 13.5 millimeters to 17.5 millimeters. Strictly 16/20 (80%) inner diameter is approximately 15.5 millimeters compared to the equivalent of a nominal tube diameter of 20A, but the applicant has an aluminum composite with an inner diameter of 13.5 millimeters to 17.5 millimeters. It was confirmed that the resin tube has sufficient flexibility and can maintain the flow rate. The inner diameter of the tube can vary depending on the equivalent tube length value to be designed, but within this range, the object of the present invention can be achieved.
Given this inner diameter, considering the amount by which the inner diameter is increased by tube expansion, it is preferably about 3 millimeters. The value is small enough that the aluminum layer cannot withstand elongation and does not break, and is large enough to improve the fluid resistance of the joint. Note that the amount of increase in the inner diameter due to pipe expansion can vary depending on the equivalent pipe length value to be designed. Corresponding to this variation, the one whose inner diameter is increased by 2 mm to 3.5 mm is assumed to be increased by “about 3 mm”.

The flexible tube of the present invention is
Both main pipe side and sprinkler nozzle side ends are expanded,
The end portion is fixed to the main pipe side joint and the sprinkler nozzle side joint.
The high pressure applied to the sprinkler piping can be sufficiently withstood by fixing at the ends joints of a size corresponding to the expanded inner diameters at both ends of the pipe.
In addition, "adhesion" may be welded as shown in Patent Document 1, or may be a caulking process or a hose band which is an adhering means by compressive deformation via caulking as in the examples described later. Other methods such as a one-touch type that can be connected with a bolt or fixing with a bolt may be used.

The flexible tube of the present invention is
The length is 4.5 meters or more, and the equivalent pipe length value in terms of the pipe nominal diameter 20A as a whole of the main pipe side joint, the flexible pipe and the sprinkler nozzle side joint is 30 meters or less. .
According to the applicant's experiment, a pipe corresponding to a nominal diameter of 16A was used, and an aluminum composite resin pipe having both ends expanded about 3 millimeters from the original inner diameter was used. When combined with a joint whose inner diameter is larger than the joint for the nominal diameter 16A, an equivalent pipe length value of 30 meters or less can be achieved with a length of about 7 meters. (Strictly speaking, the equivalent tube length value varies depending on the bending method of the flexible tube. The applicant conducted an experiment by bending at 90 degrees and four points.)
In addition, the length of 4.5 meters, 5 meters, 5.5 meters, 6 meters, 6.5 meters, and 7 meters of the length of 4.5 meters or more, and the equivalent pipe length by the above-mentioned applicant's experiment It has been found that the value can be 30 meters or less.
Sprinkler construction companies require an equivalent pipe length value of 30 meters or less due to the cost of firefighting piping construction, such as the ability of fire fighting pumps and emergency power supply.
According to the aluminum composite resin pipe with a double-ended joint for sprinkler piping of the present invention, the main pipe and the sprinkler nozzle can be connected with a pipe having a length of around 7 meters while satisfying the requirement of the equivalent pipe length value.

The sprinkler piping structure of the present invention is
A sprinkler piping structure for providing a springer nozzle at the intersection of square meshes and supplying water to all of them.
One or more main pipes provided substantially parallel to either the vertical axis or the horizontal axis of the mesh, and a flexible water supply pipe connecting the main pipe and the springer in the previous period,
The flexible water supply pipe is the flexible pipe according to any one of claims 1 to 4,
At least one of the flexible water supply pipes is longer than 4 meters.
The sprinkler piping structure of the present invention may be employed for construction with sprinkler piping in a large area that is not partitioned, or may be employed when partitioned into small partitions. First, the piping structure in a large area that is not partitioned will be described.
In the field, a sprinkler nozzle is often provided at the intersection of meshes having a side length of about 3.6 meters. In this case, suppose that the main pipe and the sprinkler nozzle are connected by a metallic flexible pipe. As described above, the length of the metallic flexible tube is 4 meters or less due to the restriction of the equivalent tube length value. Then, measures such as arranging main pipes in all meshes as shown in FIG. 5 and connecting the main pipes and water supply pipes with branch pipes as shown in FIG. 6 are required. These measures increase material costs and labor costs.
Since the flexible tube of the present invention can have a length of 7 meters, water can be supplied not only to the mesh adjacent to the main tube as shown in FIG. 7 but also to the sprinkler nozzle of the mesh ahead of the mesh. An efficient sprinkler piping structure that reduces material costs and labor costs is realized.
In addition, although described as "one or two or more" main pipes, depending on the area of the building where the sprinkler equipment is installed, several tens or 100 or more main pipes may be piped.
By reducing the amount of metal branch branch pipes and their joints used, it is expected that the incidence of water leakage accidents will be greatly reduced by reducing the number of connections between pipes and joints where water leakage may occur.
In addition, since the weight of the entire sprinkler piping system is expected to decrease significantly due to a decrease in the amount of metal piping used, the anti-seismic performance is expected to be improved because the load to the fixture of the piping to the building is reduced. It is desirable from the viewpoint.

The sprinkler piping structure of the present invention is
The main water pipe is divided into the flexible water supply pipe by a multi-joint that branches into eight or more ports.
In construction in a large area that is not partitioned, it is possible to supply water from one main pipe to many sprinkler nozzles. Therefore, it is more effective to use a multi-joint with a large number of branch ports.

The sprinkler piping structure of the present invention is
A sprinkler piping structure for supplying water to one or more sprinkler nozzles installed in a subdivision room arranged along a common space,
A main pipe provided along a common space, and a flexible water supply pipe connecting the main pipe and the springer nozzle,
The flexible water supply pipe is the flexible pipe according to any one of claims 1 to 4,
A two-way joint or three or more multi-neck joints are connected to the main pipe in front of each room, and the flexible water supply pipe directly connects the multi-neck joint and a sprinkler nozzle in the room. ,
At least one of the flexible water supply pipes is longer than 4 meters.
Next, the piping structure in the case of being divided into small sections regardless of the size of the area will be described.
Usually, hotel rooms and hospital rooms are arranged along shared spaces such as hallways and halls, and sprinkler pipes are installed along the hallways. In order to connect to the sprinkler nozzle in each room, the conventional metal flexible pipe is short in length, and a branch branch pipe is constructed from the main pipe to the inside of the room, and the tip and the sprinkler nozzle are made of metal flexible. They are connected by a tube. In hotel rooms, etc., air-conditioning equipment such as fan coils is installed in the part that corresponds to the passage in the room, and when branching branch pipes are built to the back of the room, it is easy because of the allocation of installation space with other equipment. In some cases, straight piping work cannot be performed, and construction costs are often high.
By adopting the sprinkler piping of the aluminum composite resin pipe of the present invention, a multi-branch joint is connected in front of each room of the main pipe installed along the corridor, so that a branch branch pipe is constructed inside the room. Eliminates the need to make use of its flexibility and easily connect multi-way joints and sprinkler nozzles while bypassing various devices on the way, greatly increasing the material and labor costs of sprinkler piping in each room You can save.
Here, examples of “small compartment rooms arranged along a common space” include “rooms arranged along a corridor” at a hotel, “patient rooms arranged along a corridor” at a hospital, nursing facilities There are "rooms arranged along the day room".

The flexible tube of the present invention can be connected to a long distance of 4 meters or more and can be easily piped in a complicated shape.
An efficient sprinkler piping structure that reduces material costs and labor costs is realized.
Moreover, the weight of piping behind the ceiling is reduced by reducing the number of main pipes. As a result, the effect of improving earthquake resistance is also realized.
In addition, the new sprinkler piping structure reduces the amount of metal pipes used in the entire piping system and reduces the number of connections between pipes and joints. This is intended to reduce the possibility of occurrence.

FIG. 1 is a view showing a cross section of an aluminum composite resin tube. FIG. 2 is a cross-sectional view showing the structure of the joint portion on the side connected to the sprinkler nozzle. FIG. 3 is a cross-sectional view showing the structure of the joint portion on the side connected to the main pipe. FIG. 4 is a diagram showing the entire aluminum composite resin tube. FIG. 5 is a diagram showing a conventional piping structure for a sprinkler. FIG. 6 is a view showing a conventional piping structure for a sprinkler. FIG. 7 is a view showing a piping structure for a sprinkler according to the present invention. FIG. 8 is a view showing a variation of the sprinkler piping structure of the present invention. FIG. 9 is a diagram showing an example of the sprinkler piping structure of the present invention in a hotel guest room. FIG. 10 is a diagram showing an example of a conventional sprinkler piping structure in a hotel guest room. FIG. 11 is a diagram showing an example of the sprinkler piping structure of the present invention in a hospital room. FIG. 12 is a diagram illustrating an example of a conventional piping structure for a sprinkler in a hospital room.

  Examples of the present invention will be described below. Although the dimensions are specifically shown in the examples, the dimensions shown in the examples are one representative value, and the technical scope of the present invention is not limited by these dimensions.

FIG. 1 is a view showing a cross section of an aluminum composite resin tube. An aluminum layer 11 is sandwiched between a synthetic resin inner layer 12 and a synthetic resin outer layer 13. A first adhesive layer 14 made of an adhesive is provided between the aluminum layer 11 and the synthetic resin inner layer 12, and a second adhesive layer 15 made of an adhesive is provided between the aluminum layer 11 and the synthetic resin outer layer 13. It has been.
The aluminum layer 11 has a thickness of about 0.3 mm, and is sufficiently flexible by being deformed and stretched by an external force.
The inside of the synthetic resin inner layer 12 is smooth, and the resistance value against the water flow flowing through the aluminum composite resin tube 1 is small.
In the figure, the thicknesses of the aluminum layer 11, the synthetic resin inner layer 12, the synthetic resin outer layer 13, the first adhesive layer 14 and the second adhesive layer 15 are emphasized for easy viewing of the figure. The actual cross section of the aluminum composite resin tube may be different from FIG.

FIG. 2 is a cross-sectional view showing the structure of the cap portion on the side connected to the sprinkler nozzle. A joint 2 is fitted into the aluminum composite resin pipe 1.
The aluminum composite resin pipe 1 is expanded at the end where the joint 2 is inserted, and the inner diameter Re of the end is about 3 millimeters larger than the inner diameter Ri of the center of the aluminum composite resin pipe 1.
Since the joint 2 is fitted into the aluminum composite resin pipe 1, the inner diameter Rc is smaller than the inner diameter Re of the end of the aluminum composite resin pipe 1. However, since Re is increased by the pipe expansion, Rc is larger than that when the pipe is not expanded, and the cross-sectional area of the joint portion is not significantly reduced. That is, the resistance value to the water flow is not so large due to the thin joint portion.
An expanded pipe end of the aluminum composite resin pipe 1 is inserted into the gap between the caulking ring 21 and the joint 2, and a protection bush 24 for preventing buckling is provided at the tip of the rotation stopper 23. The aluminum composite resin pipe 1 is fixed to the joint 2 by compressing and deforming the caulking ring 21 and the aluminum composite resin pipe 1 together from the outside along the outer periphery of the contact portion of the joint 2 using a dedicated tool. Water is stopped by a packing 22 located between the aluminum composite pipe 1 and the joint 2. A female screw 25 is connected to the sprinkler nozzle.

FIG. 3 is a cross-sectional view showing the structure of the base portion on the side connected to the main pipe. A joint 2 is fitted into the aluminum composite resin pipe 1. The relationship between the inner diameter Ri of the center portion of the aluminum composite resin pipe 1, the inner diameter Re of the end portion, and the inner diameter Rc of the joint is the same as that on the side connected to the sprinkler nozzle.
Insert the expanded pipe end of the aluminum composite resin pipe 1 into the gap between the caulking ring 21 and the joint 2, and connect the caulking ring 21 and the aluminum composite resin pipe 1 together on the outer periphery of the contact portion of the joint 2 using a dedicated tool from the outside. The aluminum composite resin pipe 1 and the joint 2 are firmly fixed by being compressed and deformed along. Water is stopped by a packing 22 located between the aluminum composite pipe 1 and the joint 2. The male screw 26 is connected to the multi-joint of the main pipe.
FIG. 4 is a diagram showing the entire aluminum composite resin tube. It is a figure containing the joined joint part. The aluminum composite resin pipe 1 between the end connected to the sprinkler nozzle and the end connected to the main pipe has sufficient flexibility. A female screw 25 is connected to the sprinkler nozzle, and a male screw 26 is connected to the multi-joint of the main pipe.

  In this embodiment, the joint is a straight type, but an elbow shape of 90 degrees or another angle may be used.

FIG. 5 is a diagram showing a conventional piping structure for a sprinkler. In the figure, the length of one side of the square of the mesh indicated by the dotted line is about 3.6 meters. A sprinkler nozzle 3 is provided at every intersection of the mesh. Each sprinkler nozzle sprinkles in a circle with a radius of 2.6 to 2.8 meters centered on its position depending on its performance. Sprinkler all over the floor without leaving any area that is not sprinkled from the adjacent sprinkler nozzles, because this double, 5.2-5.6 meters, is longer than the square diagonal of the mesh. Will be able to.
Water supply to the sprinkler nozzle is performed through a flexible pipe 5 that connects the main pipe 4 and the sprinkler nozzle 3. When a metal flexible tube is used as the flexible tube 5, the length is limited to 4 meters or less, and therefore it is necessary to arrange the main tube 3 densely as shown in FIG. 5, for example. This increases the material cost. Moreover, the main pipe 3 is not flexible, and it is difficult to construct the main pipe 3 so as not to interfere with other equipment such as electric wires provided on the back of the ceiling.

FIG. 6 is a view showing a conventional piping structure for a sprinkler. The pipe structure is different from that in FIG. 5, and the number of main pipes is reduced by inserting branch pipes 6 between the main pipe 3 and the flexible pipe 5. However, since the branch pipe is used, the material cost is still high.
A sprinkler piping structure other than the one shown in FIG. 5 or FIG. However, all of them have a large material cost or processing time due to the restriction of the length of the flexible tube 5.

FIG. 7 is a view showing a piping structure for a sprinkler according to the present invention. The flexible tube 5 is the aluminum composite resin tube shown in the first embodiment, and a length of up to about 7 meters can be obtained. A multi-joint joint 7 is provided in the main pipe 3 and is divided into eight flexible pipes 5.
The distance between the multi-neck joint 7 and the farthest sprinkler nozzle is approximately 5.7 meters in the figure (as projected on the plane of the figure). The length of the flexible tube 5a (flexible tube connecting the multi-joint joint 7 and the farthest sprinkler nozzle) is 5.7 due to the height difference between the main tube and the sprinkler nozzle and bypassing to avoid interference with other equipment. Even if it is longer than a meter, it is expected to fit within about 7 meters. That is, by using the aluminum composite resin pipe shown in Example 1, the sprinkler piping structure shown in FIG. 7 is realized, the material cost is suppressed by a small number of main pipes, the total weight of the pipe is reduced, and the aluminum composite pipe is realized. Interference with other equipment can be avoided by the flexibility of the resin tube.

FIG. 8 is a view showing a variation of the sprinkler piping structure of the present invention. In addition to what is shown in FIG. 7, the various sprinkler piping structures shown in this figure are made possible by a flexible tube capable of obtaining a length of up to about 7 meters.
(A) is an example in which the number of joints provided in the main pipe is reduced by a multi-port joint that divides into eight flexible pipes. (B) and (C) are examples different from FIG. 7 using a multi-necked joint that divides into eight flexible tubes. (D) is an example using a multi-joint joint that divides into four flexible tubes.
In any of the examples (A) to (D), the material cost, the total weight of the piping, and the labor of processing can be reduced as compared with the conventional example. Of course, other variations are possible.

FIG. 9 is a diagram showing an example of the sprinkler piping structure of the present invention in a hotel guest room.
The main pipe 4 is arranged in a hallway (shared space) in front of the guest room. Three sprinkler nozzles 3 are provided in the guest room.
A multi-joint joint 7 is connected to the main pipe 4 and is divided into three sprinkler nozzles. The multi-joint joint 7 and the sprinkler nozzle are directly connected by the flexible tube 5. The sprinkler nozzle at the farthest position from the main pipe has a length of 4 meters or more, but by using the flexible pipe of the present invention, the sprinkler piping structure shown in FIG. 9 is possible.

FIG. 10 is a diagram showing an example of a conventional sprinkler piping structure in a hotel guest room.
When a metal flexible tube is used, the length is limited to 4 meters or less, and therefore it is necessary to provide the branch tube 6. For this reason, there existed the problem of the cost and construction time of sprinkler piping construction.

FIG. 11 is a diagram showing an example of the sprinkler piping structure of the present invention in a hospital room. Moreover, FIG. 12 is a figure which shows the example of the conventional piping structure for sprinklers in the hospital room.
As in the case of a hotel guest room, the problem of cost and construction time of sprinkler piping work in the conventional sprinkler piping structure is solved.

  In the present embodiment, the number of multi-joint joints may be determined by the number of sprinkler nozzles provided in the guest room or hospital room. The same applies to the second and third embodiments in that the number of multi-joint joints is determined by the number of sprinkler nozzles.

Hereinafter, the effects of the reduction of fluid resistance and the reduction of the equivalent pipe length by expanding the tube will be shown.
If Ri is 15.5 millimeters and the pipe is expanded by 2.5 millimeters, Re will be 18 millimeters. From this, 13 millimeters, which is a value obtained by subtracting twice the pipe thickness of the joint (2.5 millimeters), is the value of Rc.
On the other hand, when the pipe is not expanded, Rc is 10.5 millimeters. Compared to the case where the pipe is expanded, the joint area has a cross-sectional area of only about 65% (= (10.5 / 13) ² ).
When the length of the joint 2 on the sprinkler nozzle side is 45.7 mm and the length of the joint 2 on the main pipe side is 43.5 mm, the equivalent of the main pipe side joint, the flexible pipe and the sprinkler nozzle side joint as a whole The pipe length value is 34 meters when the length of the aluminum composite resin pipe 1 is 3 meters when the pipe is not expanded, whereas it is when the length of the aluminum composite resin pipe 1 is 7 meters when the pipe is expanded. 26.8 meters. The equivalent pipe length value is greatly reduced by the expansion.

It is an aluminum composite resin pipe that can be connected to long distances of 4 meters or more and can be easily piped in a complicated shape, and the material resin and labor costs are reduced by using the composite resin pipe. Therefore, it is expected to be adopted by many sprinkler equipment installers, building contractors and building owners.
In addition to construction in a large area, even when individual rooms are lined up such as hotel rooms and hospital hospital rooms, main branch pipes are arranged along the corridors and connected to each room via the multi-joint joint 7. By connecting to the arranged sprinkler nozzles with the sprinkler piping of the present invention, it is not necessary to construct a metal branch pipe to the interior of each room, and material costs and labor costs related to sprinkler piping work can be greatly reduced. Since it is possible, the use of the sprinkler pipe of the present invention can be expected.
In addition, due to a decrease in the amount of metal pipe used, a reduction in the water leakage accident rate due to a decrease in the number of pipe-to-joint joints and an improvement in earthquake resistance due to a decrease in the overall weight of the sprinkler piping system is a major advantage for those involved in determining adoption. Therefore, the decrease in the amount of metal materials used is expected to follow the trend of ecology in the world.
As described above, the present invention has a wide range of industrial applicability.

DESCRIPTION OF SYMBOLS 1 Aluminum compound resin pipe 2 Joint 3 Sprinkler nozzle 4 Main pipe 5 Flexible pipe 6 Branch pipe 7 Multi-neck joint

Claims (7)

A flexible pipe used for water supply from a main pipe to a sprinkler nozzle in sprinkler piping,
An aluminum composite resin tube in which an aluminum layer is sandwiched between a synthetic resin inner layer and a synthetic resin outer layer and integrated by adhesion,
The end of at least one side of the main pipe side or sprinkler nozzle side is expanded,
By the pipe expansion, it is possible to use a joint in which the equivalent pipe length value of the joint becomes a sufficiently small value as a joint in a portion for joining the end and the main pipe or the sprinkler nozzle. , Flexible tube. The inner diameter of the unexpanded portion is equivalent to a nominal tube diameter of 16A,
2. The flexible tube according to claim 1, wherein an inner diameter of the expanded end portion is approximately 3 millimeters larger than an inner diameter of a non-expanded portion. Both main pipe side and sprinkler nozzle side ends are expanded,
The flexible pipe according to claim 1, wherein the end portion is fixed to the main pipe side joint and the sprinkler nozzle side joint.   The length is 4.5 meters or more, and the equivalent pipe length value in terms of the pipe nominal diameter 20A as a whole of the main pipe side joint, the flexible pipe and the sprinkler nozzle side joint is 30 meters or less. The flexible tube according to any one of claims 1 to 3. A sprinkler piping structure for providing a springer nozzle at the intersection of square meshes and supplying water to all of them.
One or two or more main pipes provided substantially parallel to either the vertical axis or the horizontal axis of the mesh, and a flexible water supply pipe connecting the main pipe and the springer nozzle,
The flexible water supply pipe is the flexible pipe according to any one of claims 1 to 4,
A sprinkler piping structure, wherein at least one of the flexible water supply pipes is longer than 4 meters.   The sprinkler piping structure according to claim 5, wherein the flexible water supply pipe is diverted by a multi-joint that branches into eight or more ports from the main pipe. A sprinkler piping structure for supplying water to one or two or more sprinkler nozzles installed in a room of a small section arranged along a common space,
A main pipe provided along a common space, and a flexible water supply pipe connecting the main pipe and the springer nozzle,
The flexible water supply pipe is the flexible pipe according to any one of claims 1 to 4,
A two-way joint or three or more multi-neck joints are connected to the main pipe in front of each room, and the flexible water supply pipe directly connects the multi-neck joint and a sprinkler nozzle in the room. ,
A sprinkler piping structure, wherein at least one of the flexible water supply pipes is longer than 4 meters.

Images