JP3535663B2 - Rain water - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater trap provided around a building such as a house to guide rainwater flowing from a gutter of the building into a gutter or the like. (Including "rainwater permeation trout" in the present specification). 2. Description of the Related Art Conventionally, as shown in FIG. 18, in order to guide rainwater flowing from a gutter of a building such as a house to a gutter,
A rain water basin 101 is buried in a ground 107 around a building 106, for example, near a place where a gutter 104 is installed in the building 106, and the rain water basin 101 is connected to a main pipe 102.
, The rainwater flowing from the gutter 104 is drained from the rain gutter 101, the main pipe 102 and the main pipe 1.
The rainwater trough (attached) 105 disposed downstream of the 02 is guided to a gutter or the like. By the way, in the above rainwater drainage system,
The rainwater basin 101 and the gutter 104 are connected via the branch pipe 103. This connection work is usually performed by
A hole is made with a hole saw or the like at the connection position of the branch pipe 103 on the main body peripheral wall of the rainwater trout 101, a seal packing is provided around the hole, and one end of the branch pipe 103 is inserted and fixed in the hole. This was done by connecting the other end of the tube 103 to the outlet of the gutter 104. [0004] However, the work of drilling a hole in the peripheral wall of the rainwater basin 101 with a hole saw or the like is usually performed on site, and thus causes a reduction in work efficiency. The work itself requires some skill, especially in the case of a small rainwater basin 101 having a diameter of about 250 mm or less, not only does it make it difficult to drill a hole, but also connects this hole to the main pipe 102 and other branch pipes. Therefore, there is a problem that the strength of the rainwater basin 101 is reduced due to the proximity of the hole formed for the purpose. In addition, holes drilled at the site construction have low accuracy in directionality and the like, and since the connection direction of the branch pipe 103 is not uniform, the hole in the branch pipe 103 connecting the rain water gutter 101 and the gutter 104 is not provided. Universal joint 1
It is necessary to arrange expensive parts such as 03a, and there is a problem that the construction cost of rainwater drainage equipment increases. Also, one or more main pipes 102 are connected to the rainwater trough 101, but since the connection direction is not uniform, several types of rainwater with different numbers and positions of protruding main pipe connecting portions 112 are provided. More and more, 101 must be prepared, which increases the material cost and lowers the work efficiency. [0005] In view of the above problems, the present invention is versatile, easy to handle, strong, can improve construction accuracy and work efficiency, and also has a construction cost and a material cost for rainwater drainage equipment. The aim is to provide a rainwater masque that can be inexpensive. In order to achieve the above object, a rainwater basin according to the present invention comprises four main pipe connection portions on a peripheral wall of a main body and adjacent main pipe connection portions having an angle of about 90 ° with each other. At least one branch pipe connection part capable of holding a branch pipe inserted at an insertion angle within a predetermined range between the main pipe connection parts is projected from the main pipe connection part. Example
Proximal end to hold the branch inserted at the insertion angle of the enclosure
Ring shape with the side formed on the outer circumference near the tip of the branch pipe connection
Insert it into the groove and insert the distal end into the branch pipe connection.
With a fold formed so as to be in sliding contact with the outer circumference of the branch pipe
It is characterized by being fitted with a hook . In the rainwater basin of the present invention, the main pipe and the branch pipe can be directly connected to the main pipe connection part and the branch pipe connection part projecting from the peripheral wall of the main body, respectively. Thus, the work of drilling holes can be eliminated, and the construction accuracy and work efficiency can be improved. In addition, since the rainwater trough can be connected to an arbitrary main pipe connecting portion of the four main pipe connecting portions projecting from the peripheral wall of the main body so as to form an angle of about 90 ° with each other, one type of rainwater trough is provided. It can be used commonly for rainwater masts with different numbers and directions of main pipes connecting the rainwater mast. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a rainwater basin according to the present invention will be described with reference to the drawings. FIGS. 1 and 2 show a rainwater basin according to a first embodiment of the present invention. The rainwater masque 1 is composed of a molded article made of polypropylene, a molded article made of rigid vinyl chloride, and a molded article made of another synthetic resin. The peripheral wall 11 of the main body is connected to the main pipe and the branch pipe. Approximately 90 to each other
The four main pipe connection parts 1 are arranged at substantially equal intervals so as to form an angle of
., And the main pipe connecting part 12,
12 and at the same height as the protruding positions of the main pipe connecting portions 12 and 12 with a predetermined range of insertion angle α.
(See FIG. 2 (b)). In this case, between the main pipe connection parts 12 and 12 and the main pipe connection part 1
Since the branch pipe connecting portion 13 is formed at the same height as the projecting positions of the two main pipe connecting portions 12, 1, the four main pipe connecting portions 12, 1 are formed.
2, ... are not exactly equidistant, but 4
The main pipe connections 12, 12,... Are formed such that adjacent main pipe connections form an angle of about 90 ° with each other. The main pipe connecting portion 12 has a socket shape for inserting and connecting the main pipe so that the main pipe can be directly connected.
Alternatively, it is formed in a spout shape to be inserted and connected to the main pipe. The branch pipe connecting portion 13 is formed in a socket shape for inserting and connecting the branch pipe 3, and is formed within a predetermined insertion angle α, specifically, from the central axis of the branch pipe connecting portion 13. Swing angle 20
The inside diameter of the branch pipe connection part 13 is formed larger than the outside diameter of the branch pipe 3 so that the branch pipe 3 can be inserted into and held in the branch pipe connection part 13 within the range of ° to 25 °. The packing 17 is attached to the open end of the branch pipe connection portion 13. The packing 17 has its proximal end inserted into a ring-shaped groove 13 c formed on the outer periphery near the distal end of the branch pipe connecting portion 13, and has its distal end inserted into the branch pipe connecting portion 13. It slides on the outer periphery of the branch pipe 3, thereby maintaining the watertightness of the branch pipe connection portion 13. As the packing, it is desirable to use a packing 17A having a large deforming ability with a fold 17a formed thereon, as shown in FIGS. 3 and 4, whereby the branch is formed as shown in FIG. 4 (b). Large insertion angle α with respect to the central axis of pipe connection portion 13
4 (c), the branch pipe 3 shifted largely parallel to the center axis of the branch pipe connection part 13 by a distance L as shown in FIG. Can be maintained. The main pipe connecting portion 12 and the branch pipe connecting portion 13 are connected to the main pipe, as in the present embodiment, so that the main pipe and the branch pipe can be selectively connected in accordance with the usage mode of the rainwater trough 1. 1 for closing the opening of the section 12 and the branch pipe connection 13
2a and 13a are integrally formed at the time of manufacturing the rain water masque 1. Then, at the time of installation, the openings of the main pipe connecting portion 12 and the branch pipe connecting portion 13 are opened by punching the lids 12a, 13a along the punching lines 12b, 13b in accordance with the usage mode of the rainwater masu 1 so as to open the main pipe. And a branch pipe can be inserted. In this case, the lid 13a of the branch pipe connection portion 13
May be omitted, and the rainwater trough 1 may be formed in a state where the opening of the branch pipe connection portion 13 is opened. In addition, main pipe connection part 1
2 and lids 12a, 1 for closing the opening of the branch pipe connecting portion 13.
Instead of 3a, detachable caps (not shown) are attached to the openings of the formed main pipe connection portion 12 and the branch pipe connection portion 13 of the rainwater gauze 1 formed in an open state, thereby connecting the main pipe and the branch pipe. The opening of the main pipe connection part 12 and the branch pipe connection part 13 that are not connected may be configured to be closed. The upper end edge of the main body peripheral wall 11 of the rain water basin 1 is double-formed to form a fitting groove 14, and the protruding edge formed on the peripheral edge of the lid 10 of the rain water basin 1 is formed in the fitting groove 14. The fitting prevents the lid 10 mounted on the upper part of the rainwater masque 1 from moving. In addition, according to the usage mode of the rain water masque 1, the fitting groove 14 is filled with an adhesive, and the lower end edge formed in a single layer of the adjuster 15 for height adjustment is fitted to integrate the two. With this, the height of the rainwater trough 1 can be adjusted. In this case, the upper end edge of the adjuster 15 is formed double to form the fitting groove 16, and the protruding edge formed on the peripheral edge of the lid 10 of the rainwater trough 1 is fitted into the fitting groove 16, The lid 10 mounted on the upper part of the adjuster 15 is prevented from moving. A mud reservoir 18 having a handle is detachably provided inside the main body of the rain water basin 1 so that mud and dust accumulated on the bottom of the rain basin 1 can be easily discharged. As shown in FIG. 5, the rainwater trough 1 is used to guide rainwater flowing from a gutter of a building such as a house to a gutter or the like, as shown in FIG. It is buried in the ground 7 near the installation location of the gutter (vertical gutter) 4 and used by connecting the gutters 1 to each other by the main pipe 2 so that the gutter 4 flows from the gutter 4 to the gutter 1,
The main pipe 2 and the rainwater trough (to be attached) 5 disposed downstream of the main pipe 2 are guided to a gutter or the like. In addition, the rain water masque 1 is a lid 12 a for closing the opening of the main pipe connection portion 12 and the branch pipe connection portion 13 according to the usage mode of the rain water masque 1.
By punching out 13a and using it, it can be used in common for a plurality of rainwater tanks having different numbers and directions of main pipes 2 connecting one type of rainwater tank 1 and directions of branch pipes 3. In this case, the main pipe connecting portion 12 and the branch pipe connecting portion 13 projecting from the main body peripheral wall 11 of the rainwater trough 1 are composed of the main pipe 2 and the branch pipe 3.
The main pipe 2 and the branch pipe 3 can be directly connected to each other because they are formed in a receptacle shape that connects by inserting a hole. This eliminates the work of drilling a hole on the peripheral wall of the rainwater mast with a hole saw or the like. Construction accuracy and work efficiency can be improved. The branch pipe connecting portion 13 is formed so that the branch pipe 3 can be inserted into and held in the branch pipe connecting portion 13 within a range of a predetermined insertion angle α. There is no need to arrange expensive parts such as universal joints, and the construction cost of rainwater drainage equipment can be reduced. FIG. 6 shows a second embodiment of the rain water basin of the present invention. The rainwater squid 1A has the same basic structure as the rainwater squid 1 of the first embodiment, and is made of a low-foamed molded product made of polypropylene, a molded product made of hard vinyl chloride, and a molded product made of another synthetic resin. In order to connect the main pipe and the branch pipe respectively, the four main pipe connecting portions 12 are arranged at substantially equal intervals so as to form an angle of about 90 ° with the main body peripheral wall 11.
, And the main pipe connecting portions 12, 12
And one branch pipe connection part capable of holding a branch pipe (not shown) inserted at a predetermined range of insertion angle at the same height as the protruding position of the main pipe connection parts 12, 12. 13 are protruded. The rain water basin 1A of this embodiment has a large number of through holes 19 formed in the peripheral wall 11 of the main body of the rain water basin 1A and a large opening 20 formed at the bottom to be used as rain water permeation. When burying rainwater infiltration 1A in the ground, first, sand is laid at the bottom of the drilling hole formed by excavating the surrounding ground to a predetermined range and depth, and the drilling hole including the upper surface of the sand is laid. A water-permeable sheet made of non-woven fabric and the like that prevents intrusion of earth and sand is provided along the inner surface, and then crushed stone is laid to a predetermined thickness on (inside) the water-permeable sheet. A permeable sheet is placed in the part where it is located, and the rainwater infiltration mosaic 1A is installed on the upper surface of the permeation sheet so that the top surface matches the ground surface, and then the rainwater infiltration mosaic 1A has a predetermined height. Filled with crushed stones, a permeable sheet is placed on the top surface, and the permeable sheet is backfilled with any soil. In addition, this rainwater infiltration 1A
Can be used as appropriate with the rainwater masquerade 1 of the first embodiment. For example, by using this rainwater squid 1A for rainwater sculpture to be buried in the ground on the garden side, the amount of water sprayed on the plants and the like can be reduced. You can save money. FIG. 7 shows a third embodiment of the rain water basin according to the present invention. The rainwater basin 1B has the same basic structure as the rainwater basin 1 of the first embodiment, and is made of a low-foaming molded product made of polypropylene, a molded product made of hard vinyl chloride, and a molded product made of another synthetic resin. In order to connect the main pipe and the branch pipe respectively, the four main pipe connecting portions 12 are arranged at substantially equal intervals so as to form an angle of about 90 ° with the main body peripheral wall 11.
, And the main pipe connecting portions 12, 12
And one branch pipe connection part capable of holding a branch pipe (not shown) inserted at a predetermined range of insertion angle at the same height as the protruding position of the main pipe connection parts 12, 12. 13 are protruded. The rain water basin 1B of the present embodiment has a main pipe connecting portion 12, 12,... Formed at the lowermost portion of the main body peripheral wall 11, and the mud reservoir is omitted. This rain water
B can reduce the overall shape, so, for example, by using it for rainwater with a small amount of inflow of mud and dirt, it is possible to reduce the construction cost and material cost of rainwater drainage equipment, and to prevent rainwater from accumulating. Can be prevented. FIGS. 8 and 9 show a fourth embodiment of the rainwater basin of the present invention. This rainwater masque 1C is made of a molded article made of polypropylene, a molded article made of hard vinyl chloride, and another molded article made of other synthetic resin. The peripheral wall 11 of the main body is connected so that the main pipe and the branch pipe can be connected to each other. About 9
Four main pipe connecting portions 12 are protruded at substantially equal intervals so as to form an angle of 0 °.
A branch pipe (not shown) inserted at a predetermined range of insertion angle is held between the main pipe connecting portions 12 and 12 and at an angle of 180 ° above the projecting position of the main pipe connecting portions 12 and 12. And two protruding branch pipe connecting portions 13 and 13. As described above, since the branch pipe connecting portions 13 are formed between the main pipe connecting portions 12 and above the protruding positions of the main pipe connecting portions 12, 12, four main pipes are formed. Can be arranged at equal intervals, and the height position where the opening of the main pipe connection portion 12 is formed and the height position where the opening portion of the branch pipe connection portion 13 is formed. Do not completely overlap, and it is possible to reduce a decrease in the strength of the rainwater 1C caused by forming these openings. The branch pipe connecting portions 13 are formed in receiving port shapes having different inner diameters so that the branch pipes 3 having different outer diameters can be inserted and held. The other basic structure of the rain basin 1C of this embodiment is the same as that of the rain basin 1 of the first embodiment. The number of the main pipe connecting portion 12 and the number of branch pipe connecting portions 13 projecting from the main body peripheral wall 11 of the rain water basin can be set to arbitrary numbers, respectively. It can be protruded at an arbitrary position between the branch pipe connecting portions 13 that do not impair the strength. FIGS. 10 to 11 show a fifth embodiment of a rain water basin according to the present invention. The rainwater masque 1D is made of a low-foaming molded article made of polypropylene, a molded article made of hard vinyl chloride, and another molded article made of synthetic resin. The main body peripheral wall 11 is connected to the main pipe and the branch pipe so that they can be connected to each other. , Four main pipe connecting portions 12 are protruded at substantially equal intervals so as to form an angle of approximately 90 ° with each other, and between the main pipe connecting portions 12, 12 and between the main pipe connecting portions 12. , 12 can hold the branch pipe 3 (see FIG. 11B) inserted at an insertion angle α within a predetermined range so as to form an angle of 180 ° at the same height as the projecting position. Branch pipe connection part 13, 1
3 are protruded. The branch pipe connecting portions 13 and 13 are formed in receiving ports having different inner diameters so that the branch pipes 3 and 3 having different outer diameters can be inserted and held, and have a predetermined insertion angle α. In order to be able to insert and hold the branch pipe 3 in the branch pipe connection part 13 within the range, specifically, within the range of the maximum deflection angle 20 ° to 25 ° from the central axis of the branch pipe connection part 13, The proximal end side of the branch pipe connecting portion 13 is formed in a shape that gradually increases in diameter. In this case, the inside diameter of the vicinity 13d of the distal end of the branch pipe connection portion 13 is formed to be substantially the same as the outer diameter of the branch pipe 3, so that the watertightness of the branch pipe connection portion 13 is maintained. The distal end 13e is formed to have a shape whose diameter gradually increases, so that the strength of the distal end of the branch pipe connecting portion 13 is not impaired. In addition, the packing 17 provided at the open end of the branch pipe connection part 13 in order to maintain the watertightness of the branch pipe connection part 13 can be omitted. The other basic structure of the rainwater basin 1D of this embodiment is the same as that of the rainwater basin 1 of the first embodiment. FIG. 12 shows a sixth embodiment of the rainwater basin of the present invention. This rainwater trout 1E has the same basic structure as the rainwater trout 1D of the fifth embodiment, and further has a rainwater trout 1E.
A large number of through holes 19 are formed in the body peripheral wall 11 of
A large opening 20 is formed at the bottom to be used as a rainwater permeation basin (for rainwater permeation vases, see rainwater basin 1A of the second embodiment shown in FIG. 6). FIG. 13 shows a seventh embodiment of the rainwater basin of the present invention. The rainwater basin 1F has the same basic structure as the rainwater basin 1D of the fifth embodiment, and further has a main pipe connection portion 1F.
Are formed at the lowermost part of the main body peripheral wall 11 and the mud pool is omitted (the operation of the rainwater basin without the mud pool is shown in FIG. 7 in the third embodiment). Of rainwater 1B). FIGS. 14 and 15 show an eighth embodiment of the rainwater basin according to the present invention. The rainwater masque 1G is made of a low-foaming molded article made of polypropylene, a molded article made of hard vinyl chloride, and another molded article made of a synthetic resin. The main body peripheral wall 11 is connected so that the main pipe and the branch pipe can be connected to each other. , Four main pipe connecting portions 12 are protruded at substantially equal intervals so as to form an angle of approximately 90 ° with each other, and between the main pipe connecting portions 12, 12 and between the main pipe connecting portions 12. , 12 can be held at the same height as the projecting position of the branch pipe 3 (see FIG. 15B) inserted at an insertion angle α within a predetermined range.
Are formed by projecting the branch pipe connecting portions 13 and protruding reinforcing ribs 21, 21,... Between the main pipe connecting portions 12, 12 and between the main pipe connecting portion 12 and the branch pipe connecting portion 13. ing. The reinforcing rib 21 covers a predetermined range in the vertical direction along the main body peripheral wall 11 of the rainwater masque 1G, specifically, the opening of the main pipe connecting portion 12 and the branch pipe connecting portion 13. By forming, the reduction of the strength of the rainwater gutter 1G due to the formation of the openings of the main pipe connection portion 12 and the branch pipe connection portion 13 is reduced. The other basic structure of the rain water basin 1G of this embodiment is the same as that of the rain water basin 1 of the first embodiment. FIG. 16 shows a ninth embodiment of the rainwater basin of the present invention. This rainwater trout 1H has the same basic structure as the rainwater trout 1G of the eighth embodiment, and further has a rainwater trout 1H.
A large number of through holes 19 are formed in the body peripheral wall 11 of
A large opening 20 is formed at the bottom to be used as a rainwater permeation basin (for rainwater permeation vases, see rainwater basin 1A of the second embodiment shown in FIG. 6). FIG. 17 shows a tenth embodiment of the rainwater basin of the present invention. This rain water masque 1I has the same basic structure as the rain water masque 1G of the eighth embodiment, and further has main pipe connecting portions 12, 12,.
The mud portion is omitted (for the operation of the rain water sill without the mud portion, etc., see the rain water basin 1B of the third embodiment shown in FIG. 7). According to the rainwater basin of the present invention , the main pipe and the branch pipe can be directly connected to the main pipe connection part and the branch pipe connection part projecting from the peripheral wall of the main body, respectively. The work of drilling holes with a hole saw etc. on the peripheral wall of the main body can be eliminated, the handling of rainwater masu becomes easy, the strong rainwater masu can be obtained, and the construction accuracy and work efficiency can be improved. Further, the rainwater basin can connect the main pipe to an arbitrary main pipe connection of the four main pipe connections protruding from the peripheral wall of the main body so as to form an angle of about 90 ° with each other. Combined with the fact that the number and direction of the main pipes connecting the rainwater basin can be commonly used for rainwater basins, the construction cost and material cost of the stormwater drainage equipment can be reduced. Also, branch pipe connection
Hold the branch pipe inserted into the part at a predetermined insertion angle.
Thus, the base end is formed on the outer circumference near the tip of the branch pipe connection.
Into the ring-shaped groove.
The folds that are in sliding contact with the outer circumference of the branch pipe inserted in
By installing the formed packing, the branch pipe connection
Branch pipes with a large insertion angle with respect to the central axis,
Deviated greatly parallel to the center axis of the pipe connection by a distance
Holds branch pipes while maintaining watertightness of branch pipe connections
be able to.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of a rainwater basin according to the present invention, wherein (a)
FIG. 2 is a front view, and FIG. 2B is a sectional view taken along line AA of FIG. FIGS. 2A and 2B are cross-sectional views showing the branch pipe connecting portion, in which FIG. 2A is a state in which a branch pipe is not connected, and FIG. 3A and 3B show a modified example of the packing, wherein FIG. 3A is a side sectional view, FIG. 3B is a front view, and FIG. 3C is a sectional view of a main part. 4A and 4B are explanatory diagrams of the operation of the packing, in which FIG. 4A shows a state in which a branch pipe located on a central axis of a branch pipe connecting portion is connected, and FIG.
Shows a state in which a branch pipe having a large insertion angle with respect to the central axis of the branch pipe connection part is connected, and FIG. 3C shows a state in which a branch pipe which is largely displaced parallel to the central axis of the branch pipe connection part is connected. It is sectional drawing. FIG. 5 is a plan view showing an example of rainwater drainage equipment using the rainwater basin of the present invention. FIG. 6 is a front view showing a rainwater basin according to a second embodiment of the present invention. FIG. 7 is a front view showing a third embodiment of the rain water basin of the present invention. FIG. 8 shows a fourth embodiment of the rainwater basin of the present invention, wherein (a)
Is a cross-sectional view of the main pipe connecting portion (a cross-sectional view taken along line CC of (d)),
(B) is a sectional view of the branch pipe connecting portion (a sectional view taken along line BB in (d)), (c) is a front view, and (d) is a side view. 9A and 9B show the branch pipe connection part, wherein FIG. 9A shows a state in which a branch pipe located on the central axis of the branch pipe connection part is connected, and FIG. 9B shows a large insertion with respect to the central axis of the branch pipe connection part. It is sectional drawing which shows the state which connected the branch pipe which has an angle. FIG. 10 is a front view showing a fifth embodiment of the rainwater basin of the present invention. 11A and 11B show the branch pipe connecting portion, wherein FIG. 11A shows a state where a branch pipe is not connected (a cross-sectional view taken along line DD in FIG. 10), and FIG. 11B shows a state where a branch pipe is connected (FIG. 3 is an enlarged view of a portion E of FIG. FIG. 12 is a front view showing a rainwater basin according to a sixth embodiment of the present invention. FIG. 13 is a front view showing a rainwater basin according to a seventh embodiment of the present invention. FIG. 14 is a front view showing an eighth embodiment of the rainwater basin of the present invention. 15A and 15B show a main pipe connection part, a branch pipe connection part, and a reinforcing rib, and FIG. 15A shows a state where a branch pipe is not connected (F in FIG. 14).
(B sectional view), (b) shows a state in which the branch pipes are connected ((a)
FIG. FIG. 16 is a front view showing a ninth embodiment of the rainwater basin of the present invention. FIG. 17 is a front view showing a tenth embodiment of the rainwater basin according to the present invention; FIG. 18 is a plan view showing a conventional rainwater drainage facility. [Description of Signs] 1 Rainwater Masque 11 Main body peripheral wall 12 Main pipe connection part 13 Branch pipe connection part 15 Adjuster 17 Packing 18 Mud reservoir 19 Through hole 20 Bottom opening 21 Reinforcing rib 2 Main pipe 3 Branch pipe 4 Rain gutter (vertical gutter) 5 Rain water

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-120763 (JP, A) JP-A-7-292758 (JP, A) JP 7-25086 (JP, U) JP 7-25086 38448 (JP, Y2) Jikken Sho 61-41826 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E03F 5/10 E03F 5/02 E03F 1/00 E02D 29/12

Claims (1)

(57) [Claim 1] Four main pipe connecting portions are provided on the peripheral wall of the main body so that adjacent main pipe connecting portions form an angle of about 90 ° with each other. At least one branch pipe connection portion capable of holding a branch pipe inserted at a predetermined range of insertion angle therebetween is protruded, and the branch pipe connection portion has a predetermined range of insertion angle.
At the proximal end to hold the branch pipe inserted
Fits into a ring-shaped groove formed on the outer periphery near the tip of the connecting part
So that the distal end is outside the branch pipe inserted into the branch pipe connection.
Packing with a fold formed so that it slides around
Masu rain water, characterized in that it was wearing.