JP5178091B2 - Branch joint and sprinkler - Google Patents

Description

  The present invention relates to a branch joint and a water sprinkler, and more particularly to a water sprinkler used for snow removal or snow melting (snow removal), heat island countermeasures or water sprinkling in farms, and a branch joint used therefor.

  Examples of conventional branch joints are disclosed in Patent Documents 1 to 3.

  In the water supply device for snow removal of Patent Document 1, a socket is fitted into a hole provided in the water supply pipe, and the socket is joined to the water supply pipe by welding or adhesion. Then, by inserting the upper short pipe into the socket, the upper short pipe is connected to the water supply pipe through the socket.

  In the piping structure in the road surface sprinkling and snow melting system of Patent Document 2, the socket plate is closely attached to the outer peripheral surface of the water pipe while the socket pipe portion is aligned with the connection hole of the water pipe, and the socket body is bonded to the water pipe. Fixed. And a branch pipe is connected to a water pipe via a socket by inserting a branch pipe in the socket pipe part of a socket body.

In the piping block with a water spray nozzle for snow extinguishing in Patent Document 3, the socket is fixed to the main pipe by screwing the male screw provided in the socket with the female screw formed in the opening of the main pipe. And a riser pipe is connected to a main pipe via a socket by inserting a riser pipe in the large diameter short pipe part of a socket.
Japanese Utility Model Publication No. 7-34027 [E01H 5/10, E01C 11/26] JP-A-9-158142 [E01H 3/04, E01H 5/10] JP 2002-356824 A [E01H 5/10, F16L 41/03] JP 2001164453 A [E01H 5/10, E01C 11/22 11/24 E01C 3/04] JP 2000-27137 A [E01H 3/04]

  In the prior art of Patent Document 1, when concrete is poured around the upper short pipe and the water supply pipe, the concrete generates heat of hardening and changes in temperature. Generally, the length of a water pipe made of resin expands and contracts greatly compared to concrete due to changes in temperature. Therefore, just by fitting a socket in the hole of the water pipe and welding it, the heat of the water pipe is attached to the joint. The force due to expansion and contraction is concentrated and the joint portion is damaged. Thereby, the water stoppage between a water pipe and an upper short pipe is not maintained.

  On the other hand, in the prior art of patent document 2, since the girdle part eases the concentration of force due to thermal expansion and contraction of the water pipe, the joint between the socket and the water pipe is less likely to be damaged. However, when attaching the socket body to the water pipe, it is necessary to bond the padding to the outer peripheral surface of the water pipe while aligning the socket pipe portion with the connection hole of the water pipe. It takes time.

  Moreover, in the prior art of patent document 3, it is necessary to form a screw | thread in the opening and socket of a main pipe, and to screw in a screw | thread, and an installation operation requires an effort. Moreover, there is a risk of water leaking from between the main pipe and the rising pipe due to the force due to the thermal expansion and contraction of the main pipe acting on the threaded portion and damaging the threaded portion.

  Patent Documents 4 and 5 disclose a snow extinguishing block and a piping block as the background of the present invention, but are not characterized by a branch joint.

  Therefore, the main object of the present invention is to provide a novel branch joint and watering device.

  Another object of the present invention is to provide a branch joint and a watering difference device that can be easily mounted and can exhibit stable water stopping performance.

  The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses, supplementary explanations, and the like indicate correspondence with embodiments to be described later in order to help understanding of the present invention, and do not limit the present invention.

1st invention is a branch joint which connects a branch pipe to a main pipe in order to sprinkle the water which passed through the main pipe covered with a solid layer to the outside from a water nozzle through a branch pipe, and is made from elastic material. it is formed in a short tubular that have a matching inner diameter branch hole provided in the smaller and the main pipe than the outer diameter of the branch pipe has a tapered portion which is inclined downwardly inward in the inner periphery of the upper end and from there A branch pipe connection part into which the branch pipe is press-fitted , provided on the inner peripheral surface of the branch pipe connection part, and the compression rate when the branch pipe is press-fitted into the branch pipe connection part is the compression of the thickness of the branch pipe connection part A protrusion ring that is set to be larger than the rate and improves the water stoppage between the branch pipe at that position, integrally with this below the branch pipe connection part, and more than the thickness of the branch pipe connection part A tapered part that is formed with a reduced thickness and that slopes upward and outward on the outer periphery of the lower end. While being inserted has and from there to branch hole, the branch hole inserting portion which branch pipe is pressed into the interior, an elastic material, the flange portion formed spread to the outer periphery of the branch pipe connecting portion, and the flange portion and A pressure-sensitive adhesive layer provided between the outer surface of the main pipe is provided, and the compressibility of the thickness of the branch pipe connection portion when the branch pipe is press-fitted into the branch pipe connection portion is 10% or more and 50% or less. Is a branch joint in which the diameter dimension of the branch pipe connection portion is set.

  In the first invention, the branch joint (18: reference numeral exemplifying a portion corresponding to the embodiment. The same applies hereinafter) is connected to the main pipe (14) in the concrete layer (12). The branch joint (18) has a short tubular branch pipe connection portion (28) and a flange portion (30) extending outward. The collar part (30), that is, the branch joint (18) is attached to the main pipe (14) by the adhesive layer (34) provided between the collar part (30) and the main pipe (14).

  According to the first aspect of the invention, since the collar portion of the branch joint and the outer surface of the main pipe are attached via the adhesive layer, the branch joint can be easily attached to the main pipe. At this time, even if the internal water pressure of the main pipe acts between the flange part of the joint and the main pipe, the collar part is supported by the concrete layer, so the collar part and the adhesive layer do not peel off and branch off. Sufficient water-stopping between the joint and main pipe can be secured. Moreover, since the branch joint and the main pipe are attached via an adhesive layer, for example, when the main pipe is made of polyethylene pipe and the branch joint is made of vinyl chloride or rubber, it is attached with a bonding agent or adhesive. A combination of a main pipe and a branch joint of a material that cannot be used is available. Further, when a mounting failure of the branch joint or the branch pipe occurs, the branch joint can be detached from the main pipe and attached again. Therefore, for example, if abnormalities or defects occur in the branch structure parts before the concrete layer is formed, or if there are aging defects in them, remove the branch joint and perform the necessary repairs or repairs. Can be reattached. Furthermore, since the stress concentration in the branch joint portion due to thermal expansion and contraction can be dispersed and alleviated by the elasticity of the adhesive layer, accidents such as damage to the main branch branch attachment portion are greatly reduced.

A second invention is a branch joint for connecting the branch pipe to the main pipe in order to sprinkle the water passed through the main pipe from the water nozzle through the branch pipe, and is made of an elastic material. It is formed in a short tubular that have a matching inner diameter branch hole provided in the smaller and the main pipe than the outer diameter, the branch pipe and has a tapered portion from which the interior sloping downwardly inwardly into the inner periphery of the upper end It is provided on the inner peripheral surface of the branch pipe connecting portion to be press-fitted, and the compression rate when the branch pipe is press-fitted into the branch pipe connecting portion is larger than the compressibility of the thickness of the branch pipe connecting portion. A ridge ring that is set so as to improve the water stoppage between the branch pipe at that position, and below the branch pipe connection part, integrally with this and with a thickness smaller than the thickness of the branch pipe connection part Formed and has a tapered portion inclined upward and outward at the outer periphery of the lower end, and there While being inserted into et branch hole, the branch hole inserting portion which branch pipe is pressed into the interior, an elastic material, formed spread to the outer periphery of the branch pipe connecting portion, the flange portion is pressed against the main, and the flange portion And a pressure-sensitive adhesive layer provided between the outer surface of the main pipe and the compressibility of the thickness of the branch pipe connecting portion when the branch pipe is press-fitted into the branch pipe connecting portion is 10% or more and 50% or less. This is a branch joint in which the diameter dimension of the branch pipe connecting portion is set.

In the second invention, the branch joint (18) is connected to the main pipe (14). The branch joint (18) has a short tubular branch pipe connection portion (28) and a flange portion (30) extending outward. The collar part (30), that is, the branch joint (18) is attached to the main pipe (14) by the adhesive layer (34) provided between the collar part (30) and the main pipe (14). This collar is pressed against the main.

  In the second invention, the same effect as in the first invention can be expected.

3rd invention is the branch joint of 1st or 2nd invention attached to the main pipe, the branch pipe inserted in the branch pipe connection part of a branch joint, the watering nozzle attached to a branch pipe, and the upper end of a watering nozzle A watering block comprising a solid layer exposing an opening and covering at least a branch joint.

In the third invention, the branch joint (18) of the first or second invention is used, and the branch joint is attached to the main pipe (14). And a water spray nozzle (22) is connected with the branch pipe connection part of a branch joint. The watering nozzle is joined to the branch pipe connection portion indirectly or directly via a connection pipe such as the branch pipe (20). The solid layer (12) exposes the upper end opening of the watering nozzle and covers at least the branch joint. When water is passed through the main pipe, water is discharged from the watering nozzle.

According to this invention, since the branch joint and the main pipe are attached via the adhesive layer, the attachment work is simple, and in that state, the solid layer such as a concrete layer is pressed down by the reaction force. Can demonstrate stable water stop performance,
The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  A watering device block 10 according to one embodiment of the present invention shown in FIG. 1 includes a concrete layer 12 having a prismatic shape, for example, a section of which is a trapezoid or a rectangle and whose installation surface is a plane. However, this FIG. 1 shows only a part of the watering block 10.

  A main pipe 14 is embedded in the concrete layer 12. The main pipe 14 may be a resin pipe made of a synthetic resin such as vinyl chloride or polyolefin, or a metal pipe made of stainless steel or steel.

  A branch hole 16 is formed in the main pipe 14, and a branch joint 18 is attached to the outer surface of the main pipe 14 in the concrete layer 12 in relation to the branch hole 16. The branch joint 18 is for connecting the branch pipe 20, and this branch pipe 20 may also be a resin pipe made of a synthetic resin such as vinyl chloride or polyolefin, or a metal pipe made of stainless steel or steel. .

  The lower part of the branch pipe 20 is inserted into the branch joint 18, and a water sprinkling nozzle 22 made of, for example, stainless steel or steel is attached to the upper end of the branch pipe 20 by a rubber ring 24. The upper part of this watering nozzle 22 is funnel-shaped as an example, and the rubber ring accommodating part 26 which accommodates the rubber ring 24 is formed in the lower part. The rubber ring 24 is accommodated in the rubber ring accommodating portion 26, and the water spray nozzle 22 is attached to the branch pipe 20 by inserting the upper end of the branch pipe 20 into the lower part of the water spray nozzle 22 in this state. The upper end opening of the watering nozzle 22 is exposed from the upper end surface of the concrete layer 14.

  A plurality of water spray blocks 10 each having such a structure are connected in series by a connecting portion 102 and the main pipes 14 are connected in a water-tight manner to form the water spray device 100 shown in FIG. However, the serial connection structure itself of the watering block 10 is not the gist of the present invention. For example, the joining method disclosed in Patent Documents 3 and 4 mentioned above may be employed, or the connection structure previously proposed by the applicant of the present application in Japanese Patent Application No. 2006-46424 may be employed. Because the connection structure is not limited, FIG. 2 does not accurately illustrate the connection between the water spray blocks 10 or the joint portion 102.

  One sprinkling block 10 has an overall length of, for example, about 5500 mm, and the installation interval of the watering nozzles 22 is about 1000 mm. Therefore, about five watering blocks 10 are provided in one watering block 10, but in order to simplify the drawing in FIG. 2, the watering nozzles of the correct number of installations are not necessarily illustrated. Please also note the points.

3 shows in detail the branch joint 18 used in the embodiment of FIG. 1, FIG. 3 (A) is a longitudinal sectional view passing through the center thereof, FIG. 3 (B) is a top view, and FIG. 3 (C). As shown above, the branch joint 18 is for connecting the branch pipe 20 to the main pipe 14, and is formed by injection molding of an elastic material such as rubber or elastomer as a whole. As the rubber, for example, styrene butadiene rubber (SBR) is used. The elastomer may be a vinyl chloride elastomer.

  However, the branch joint 18 may be formed of a synthetic resin such as vinyl chloride or polyethylene instead of the elastic material as described above.

  The branch joint 18 includes a short tubular branch pipe connection portion 28 into which the branch pipe 20 is inserted. In this embodiment, the outer diameter of the branch pipe 20 is 22 mm as an example, and the inner diameter of the branch pipe connection portion 28 is 16 mm as an example in consideration of the compression rate of the branch pipe connection portion 28 (described later). As an example, it is 34 mm. Therefore, the thickness of the branch pipe connecting portion 28 is 9.0 mm, and the height is approximately 24 mm.

  On the outer periphery of the branch pipe connection portion 28, a flange portion 30 that extends in a circular shape is formed integrally with the branch pipe connection portion 28. The outer diameter of the collar part 30 is 84 mm as an example, and the thickness is 1 mm as an example.

  A branch hole insertion portion 32 extending integrally from the branch pipe connecting portion 28 below the collar portion 30 is formed integrally with the branch pipe connecting portion 28. The inner diameter of the branch hole insertion portion 32 is 16 mm, which is the same as the inner diameter of the branch pipe connection portion 28, but the outer diameter is 25 mm, and the thickness of the branch hole insertion portion 32 is considerably thinner than the thickness of the branch pipe connection portion 28. ing. This is to facilitate the insertion of the branch hole insertion portion 32 into the branch hole 16. However, the outer diameter of the branch hole insertion portion 32 is naturally equal to or slightly smaller than the inner diameter of the branch hole 16 considering that the branch hole insertion portion 32 is inserted into the branch hole 16 described above. Is done. The height of the branch hole insertion portion 32 is 13 mm as an example, but if this height is taken into consideration that the branch hole insertion portion 32 is inserted into the branch hole 16, it is naturally the same as the wall thickness of the main pipe 14. Slightly shortened.

  When the branch joint 18 is formed of a synthetic resin instead of an elastic material, the outer diameter of the branch hole insertion portion 32 may be slightly smaller than the diameter of the branch hole 26. By doing so, the buffer function of the adhesive layer 34 is maintained, the stress concentration in the branch joint 18 due to thermal expansion and contraction can be dispersed, and the branch portion can be protected.

  Further, the inner circumference of the upper end of the branch pipe connecting portion 28 and the outer circumference of the lower end of the branch hole insertion portion 32 are both tapered, but the former is for easier insertion of the branch pipe 20, and the latter is for insertion of the branch hole. This is for facilitating insertion of the portion 32, and any taper can be eliminated.

  In order to branch the main pipe 14 shown in FIG. 1 using such a branch joint 18, first, the main pipe 14 having a predetermined length is prepared.

  Next, a branch hole 16 having a predetermined inner diameter is formed at a predetermined position of the main pipe 14 using a hole saw (not shown).

  On the other hand, an adhesive layer 34 made of an adhesive such as butyl rubber (unvulcanized) is formed on the bottom surface (lower surface) (FIG. 3C) of the collar portion 30 of the branch joint 18. The material of this adhesive is not limited to butyl rubber, but any material such as rubber, acrylic or silicone can be used as long as it has the same adhesiveness (property to adhere to a solid with a slight pressure). Adhesives are available. As a method for forming the pressure-sensitive adhesive layer 34, a method of applying a sheet-shaped pressure-sensitive adhesive (for example, a double-sided tape), a method of applying a solvent, water, or a pressure-sensitive adhesive in a molten state can be considered. It should be noted that the term “branch joint” may be used to include a state in which the pressure-sensitive adhesive layer 34 is formed on the lower surface of the collar portion 30 as described above.

  After the branch hole 16 is drilled in the main pipe 14 as described above, the branch hole insertion portion 32 of the branch joint 18 is inserted or inserted into the branch hole 16. And the branch joint 18 is pushed in until the collar part 30 adheres to the outer surface of the main pipe 14 around the branch hole 16 by the above-mentioned adhesive layer 34. However, at this time, it is preferable that the outer surface of the main pipe 14 below the collar portion 30 is subjected to a cleaning process, and dust and dirt adhering to the outer surface are removed. This is because the adhesive force by the adhesive layer 34 is not lowered.

  Next, as shown in FIG. 4, the branch pipe 20 is inserted or press-fitted into the branch pipe connecting portion 28 of the branch joint 18. As described above, when the inner diameter of the branch pipe connection portion 28 is 16 mm and the outer diameter is 34 mm, for example, the thickness of the branch pipe connection portion 28 is 9.0 mm (= (34-16) / 2). On the other hand, since the outer diameter of the branch pipe 20 is, for example, 22 mm, the inner diameter of the branch pipe connecting portion 28 when the branch pipe 20 is press-fitted is 22 mm. Further, the outer diameter of the branch pipe connecting portion 28 remains 34 mm because this portion does not spread outward due to the rigid reaction force of the branch pipe connecting portion 28. Accordingly, the thickness of the branch pipe connecting portion 28 at this time is 6 mm (= (34-22) / 2), and the thickness of the branch pipe connecting portion 28 is crushed by 3 mm (compressed) by inserting the branch pipe 20. It will be. That is, the compression allowance is 3 mm. Therefore, in this embodiment, the compression rate of the branch pipe connection portion 28 of the branch joint 18 is (3/9 × 100 =) 33%.

  That is, the compression ratio can be defined as the ratio of the compression allowance when the branch pipe 20 is inserted with respect to the original thickness of the branch pipe connection portion 28. If the compression ratio of the branch pipe connection portion is set to 10% or more, the branching The watertightness between the pipe 20 and the branch pipe connection portion 28 can be appropriately maintained.

  The hardness of the elastic material used in this example is about 50 Hs (JISA).

  In another embodiment, when the outer diameter of the branch pipe connecting portion 28 is 34 mm and the inner diameter is 20.5 mm, for example, the compressibility is 11.1% if the outer diameter of the branch pipe 20 is 22 mm. Original thickness of the branch pipe connecting portion 28 (34-20.5) /2=6.75 mm, thickness of the branch pipe connecting portion 28 when the branch pipe 20 is inserted (34-22) / 2 = 6 mm, compression allowance 6.75-6 = 07.5 mm, and the compression ratio is 0.75 / 6.75 × 100 = 11.1%.

  Since the compression ratio directly affects the water stop performance between the branch joint 18 and the branch pipe 20, a higher compression ratio is desirable for securing water stoppage. However, if the compression ratio exceeds 50%, the branch pipe Since a considerable force is required for inserting 20, the upper limit of the compression rate may be designed in consideration of the insertion resistance of the branch pipe 20.

  That is, when the hardness of the elastic material is 50 Hs (JISA), the diameter dimensions of the branch pipe 20 and the branch pipe connection portion 28 are set so that the compression rate of the branch pipe connection portion 28 is 10% or more and 50% or less. Is desirable.

  In order to change the compression ratio of the branch pipe connecting portion 28, a method of changing the outer diameter of the branch pipe 20 or a method of changing the outer diameter of the branch pipe 20 may be considered in addition to changing the inner diameter of the branch pipe connecting portion 28 as described above. It is done. It can be appropriately changed according to the design specifications.

  After inserting the branch pipe 20 into the branch pipe connecting portion 28 of the branch joint 18 in this manner, as shown in FIG. 1, a water spray nozzle 22 is fitted into the upper end of the branch pipe 20 to form a rubber. Join the ring.

  Finally, as shown in FIG. 1, the main pipe 14 and the branch pipe 20 are covered with a concrete layer 12. That is, by placing concrete using a mold (not shown), the main pipe 14, the branch joint 18, the branch pipe 20, and the water spray nozzle 22 are connected to the concrete layer with the funnel-shaped upper end opening of the water spray nozzle 22 exposed. 12, and one watering block 10 is completed.

  The watering apparatus 100 shown in FIG. 2 is formed by connecting a plurality of watering blocks 10 each having such a structure in series by a connecting portion 102. When water flows through the main pipe 14, the water reaches the watering nozzle 22 from the main pipe 14 through the branch pipe 20 and is discharged to the outside from the opening of the watering nozzle 22 exposed from the concrete layer 12. Such a watering device can be used as a snow melting or snow removing device, and further as a watering device for heat island countermeasures or a watering device for irrigation in a farm.

  In the embodiment described with reference to FIGS. 1 to 4, the collar portion 30 of the branch joint 18 and the outer surface of the main pipe 14 are attached via the adhesive layer 34. The water stoppage between the main pipe 14 and the main pipe 14 is obtained. However, since the pressure-sensitive adhesive layer 34 peels off when a force is continuously applied, when the water is passed through the main pipe 14 or the branch pipe 20, the branch joint 18 may be detached from the outer surface of the main pipe 14 due to the water pressure. . However, in the embodiment, since the entire body including the main pipe 14 and the branch structure is covered with a solid layer such as the concrete layer 12, even if a force for pushing up the collar portion 30 by water pressure acts, the solid layer Even if the layer applies a reaction force toward the main pipe 14 from the top of the collar portion 30 of the branch joint 18 and both are attached via the adhesive layer 34 having a weak holding force, the branch joint 18 is connected to the main pipe by water pressure. 14 does not peel off. In that sense, the concrete layer 12 of the embodiment may be replaced with a solid layer such as resin concrete or synthetic resin. Such a solid layer presses at least the collar portion 30 toward the main pipe 14 against a peeling force (generates a reaction force).

  1 to 4, the branch joint 18 and the main pipe 14 are attached via the adhesive layer 34. For example, the main pipe 14 is a polyethylene pipe and the branch joint 18 is chlorinated. As in the case of vinyl or rubber, a combination of a main pipe and a branch joint, which cannot be attached with a bonding agent or an adhesive, can be used. Further, when the attachment failure of the branch joint 18 or the branch pipe 20 occurs, the branch joint 18 can be detached from the main pipe 14 and attached again.

  Therefore, for example, when an abnormality or failure occurs in the branch structure part before the concrete layer 12 is formed, the branch joint 18 can be removed and reattached after necessary repairs or repairs.

  Further, a watering device 100 as shown in FIG. 2 is normally embedded in a roadway, on which a vehicle travels, and a repetitive load caused by the passage of the vehicle acts on a branching structure such as a watering nozzle 22 to branch. Problems may occur over time at the root of the joint 18 or the watering nozzle 22.

  Even in such a case, for example, repair can be performed as shown in FIG. For example, the concrete layer 12 covering the branch structure is removed with a hole saw or the like, and a hole 36 is formed so that the branch structure is exposed to the whole. At this time, however, care must be taken not to damage the main pipe 14 with a hole saw or the like. Thereafter, the branch joint 18 is removed from the main pipe 14, and necessary parts such as the branch pipe 20 and the watering nozzle 22 are replaced, or the combination of the branch joint 18, the branch pipe 20 and the watering nozzle 22 (that is, the branch structure) as a whole. Replacement and repair, and then refill the hole 36 with concrete.

  Further, by forming the branch joint 18 from an elastic material such as rubber as in the embodiment, the stress concentration in the branch joint 18 due to thermal expansion and contraction can be dispersed and alleviated. Accidents in which the 18 mounting parts are damaged are greatly reduced.

  Moreover, if the branch hole insertion part 32 is provided in the branch joint 18 as in the embodiment, and the branch hole insertion part 32 is inserted into the branch hole 16 of the main pipe 14, the branch hole insertion part 32 makes a connection with the branch hole 16. A certain degree of water-stopping can be expected, and further, a centering (positioning) effect by the branch hole insertion portion 32 can be expected.

  FIG. 6 shows a branch joint according to another embodiment of the present invention. The branch joint 18 of FIG. 6 embodiment is the same as the branch joint 18 shown in FIG. 3 except that a projecting ring 38 is formed on the inner peripheral surface of the branch pipe connecting portion 28. Therefore, the overlapping description is omitted.

  In the embodiment of FIG. 3, the compression ratio with respect to the entire thickness of the branch pipe connection portion 28 is set to be 10% or more. However, the larger the compression ratio, the better the water stoppage, but a large force is required at the time of insertion. The difficulty of inserting the branch pipe 20 into the branch pipe connecting portion 28 increases. Therefore, in this embodiment of FIG. 6, a relatively large compression ratio, for example, 30% is secured in the projecting ring 38 portion, and a relatively small compression ratio, for example, 10%, in the other portion of the branch pipe connecting portion 28. The trade-off between water-stop and ease of insertion of the branch pipe 20 is solved. However, the same idea as described above for the “compression ratio” is also applied to the projecting ring 38 portion.

  FIG. 7 shows a branch joint according to another embodiment of the present invention. The branch joint 18 of FIG. 7 embodiment is the same as the branch joint 18 shown in FIG. 6 except that the branch hole insertion portion 32 is removed. Therefore, the overlapping description is omitted. However, in this FIG. 7 embodiment, the protruding ring 38 can also be removed as in the embodiment of FIG.

  When the projecting ring 38 is removed in the embodiment of FIG. 7 or when the projecting ring is not formed as in the embodiment of FIG. 3, the branch tube 20 depends on the compression ratio and the water pressure at the branch tube connection portion 28. However, in this case, as shown in FIG. 8, the branch pipe connection portion 28 is inserted from the outside with the branch pipe 20 inserted into the branch pipe connection portion 28. For example, it may be secured by a fastening means 40 such as a SUS band, a wire, or a resin band so that the compression rate at the branch pipe connecting portion 28 can be secured.

  Note that the specific numerical values of the angles and dimensions given above are merely examples, and can be appropriately changed as necessary.

  Moreover, in each Example shown in FIGS. 6-8, it is the same as that of FIG. 1-4 FIG. 4 that the adhesive layer 34 is formed in the lower surface of the collar part 30. FIG.

  Further, in the above-described embodiment, the watering nozzle 22 is connected to the main pipe 14 by attaching separate watering nozzles to the branch pipe, but the watering nozzle 22 is integrally formed at the tip of the branch pipe 20. It is also possible to insert the integrated body into the branch pipe connecting portion 28 of the branch joint 18.

FIG. 1 is a sectional view showing a watering block according to one embodiment of the present invention. FIG. 2 is an illustrative view showing a watering device using the watering block of FIG. 1. FIG. 3 is an illustrative view showing the branch joint of FIG. 1 in detail, in which FIG. 3 (A) is a longitudinal sectional view, FIG. 3 (B) is a top view, and FIG. 3 (C) is a bottom view. It is an illustration figure which shows the principal part of FIG. 1 Example. It is an illustration figure which shows an example of the method of repairing the part of a branch structure in FIG. 1 Example. FIG. 6 is a sectional view showing a branch joint according to another embodiment of the present invention. FIG. 7 is a sectional view showing a branch joint of still another embodiment of the present invention. FIG. 8 is a sectional view showing a branch joint according to another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Sprinkling block 12 ... Concrete layer 14 ... Main pipe 16 ... Branch hole 18 ... Branch joint 20 ... Branch pipe 22 ... Sprinkling nozzle 30 ... Collar part 32 ... Branch hole insertion part 34 ... Adhesive layer 38 ... Projection ring 100 ... Sprinkler

Claims (3)

A branch joint for connecting the branch pipe to the main pipe in order to sprinkle the water passed through the main pipe covered with the solid layer to the outside from the water nozzle through the branch pipe;
An elastic material, wherein formed in the short tube to have a matching inner diameter branch hole provided in smaller and the main than the outer diameter of the branch pipe, a tapered portion which is inclined downwardly inward in the inner periphery of the upper end a and the branch pipe connecting portion to which the branch pipe is press-fitted from there to the interior,
Provided on the inner peripheral surface of the branch pipe connecting portion, the compression rate when the branch pipe is press-fitted into the branch pipe connecting portion is set to be larger than the compressibility of the thickness of the branch pipe connecting portion. A ridge ring that improves waterstop between the branch pipe at the position,
The branch pipe connecting portion is formed integrally therewith and thinner than the branch pipe connecting portion, and has a tapered portion inclined upward and outward on the outer periphery of the lower end, and from there the branch hole And a branch hole insertion part into which the branch pipe is press-fitted,
It is made of an elastic material, and includes a flange portion that is formed so as to spread on the outer periphery of the branch pipe connecting portion, and an adhesive layer provided between the collar portion and the outer surface of the main pipe,
The branch pipe connecting portion has a diameter dimension set such that the compression ratio of the thickness of the branch pipe connecting portion when the branch pipe is press-fitted into the branch pipe connecting portion is 10% or more and 50% or less. Fittings. A branch joint for connecting the branch pipe to the main pipe in order to sprinkle the water passed through the main pipe from the water nozzle through the branch pipe,
An elastic material, wherein formed in the short tube to have a matching inner diameter branch hole provided in smaller and the main than the outer diameter of the branch pipe, a tapered portion which is inclined downwardly inward in the inner periphery of the upper end a and the branch pipe connecting portion to which the branch pipe is press-fitted from there to the interior,
Provided on the inner peripheral surface of the branch pipe connecting portion, the compression rate when the branch pipe is press-fitted into the branch pipe connecting portion is set to be larger than the compressibility of the thickness of the branch pipe connecting portion. A ridge ring that improves the waterstop between the branch pipe at that position;
The branch pipe connecting portion is formed integrally therewith and thinner than the branch pipe connecting portion, and has a tapered portion inclined upward and outward on the outer periphery of the lower end, and from there the branch hole And a branch hole insertion part into which the branch pipe is press-fitted,
It is made of an elastic material, is formed so as to spread on the outer periphery of the branch pipe connecting portion, and includes a collar portion that is pressed against the main pipe, and an adhesive layer provided between the collar section and the outer surface of the main pipe,
The branch pipe connecting portion has a diameter dimension set such that the compression ratio of the thickness of the branch pipe connecting portion when the branch pipe is press-fitted into the branch pipe connecting portion is 10% or more and 50% or less. Fittings. The branch joint according to claim 1 or 2 , attached to the main pipe,
A branch pipe inserted into the branch pipe connecting portion of the branch joint;
The watering block provided with the watering nozzle with which the said branch pipe is mounted | worn, and the solid layer which exposes the upper end opening of the said watering nozzle, and coat | covers the said branch joint at least.

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