JP2005155706A - Branch joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a branch joint having satisfactory operation property in a narrow place and having excellent airtightness. <P>SOLUTION: The branch joint 3 is provided with an upper side main body 5 and a lower side main body 6 tightened on an outer peripheral face of an original pipe 1. The lower side main body 6 has a branched part 64 which is communicated with the original pipe 1 and whose end part is sealed by a detachable cap 8 and a branch pipe receiving part 65 extending from the branched part 64 in the direction in which it crosses the original pipe 1. A hole saw 7 driven upward is mounted inside the branched part 64. A fire-resistant packing 93 adhering closely to the original pipe 1 is fitted in the lower side main body 6. The branched part 64 and the hole saw 7 and the branched part 64 and the cap 8 are sealed by an O-ring 91 and a metal seal 92. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a branch joint used for taking out a branch pipe from a main pipe constituting an indoor gas pipe.

  In an indoor gas pipe laid in a store or factory, a branch pipe is taken out from a main pipe, and a gas appliance is connected to the end of the branch pipe. If the gas supply is stopped, the main pipe is cut off, and the branch is taken out, the operation of the gas user will be hindered. Therefore, the gas user such as pipe construction when the gas user does not use it at night or on holidays. Consideration that does not hinder the work is necessary, and the take-out position is difficult to work on, such as behind the ceiling. Therefore, in order to solve these problems, it has been proposed to put a joint containing explosives into the main pipe, which is put into practical use (see Patent Document 1). The joint (T-joint fitting) includes a lower housing that covers the lower outer peripheral surface of the pipe (main pipe), and a space portion in which the branch pipe (branch pipe) is screwed from the direction orthogonal to the pipe and communicates with the branch pipe. The upper housing having a passage connected to the bolt is tightened and fixed with a bolt, and a piston having a cutting blade is inserted into the entire surface of the passage, and a cartridge having a socket with an ignition pin, in which a gunpowder is stored at the rear end of the piston, is loaded. The nut is screwed into the structure. According to this joint, for example, by hitting the ignition pin with a hammer, the piston is actuated by the explosive energy of the explosive, a part of the pipe is cut off, and the pipe and the branch pipe are communicated.

  The above joint has an advantage that the branch can be taken out by a simple operation such as mounting of the joint and striking with a hammer, but has the following problems. Since explosives are used, if the product is stored for a long time after the joint is manufactured, a phenomenon may occur where the explosive absorbs moisture or the explosive force is insufficient and the piston stops halfway. It is necessary to redo work at the place. In addition, due to the explosion of gunpowder, piping construction is accompanied by loud sound and piping vibration. Since explosives are used, there is also a problem that it is difficult to stably supply joints in Japan where the provisions regarding the storage and handling of explosives are strict, and it takes a long time to obtain them.

  It is also conceivable to use a branch extraction joint that does not use explosives. For example, in Patent Document 2, a metal upper saddle, which is divided and placed on the outer peripheral surface of a steel pipe, is clamped and fixed to the outer surface of the steel pipe by bolts and nuts, and a resin pipe is connected from a branch connection provided on the upper saddle. A joint that branches and takes out, and the upper saddle is provided with a resin coating layer on at least the outer surface, and a resin pipe connection in which a resin short pipe is fixed for branching at a branch port that branches from the center main drilling pipe to the side It is described that a part is provided. It describes that a resin tube is perforated by rotating a hole saw having a serrated cutting edge at a tip screwed into a female screw of the cylinder from a cylinder body in which the hole saw is internally mounted, with a drill or the like. However, according to this branch take-out joint, since the horusoe is moved from the top to the bottom, there is a problem that it cannot be applied to indoor piping behind the ceiling where only a small work space is available.

Japanese Patent Publication No. 1-51719 (pages 2-4, FIG. 1) JP-A-9-32989 (pages 3-4, FIG. 1)

  Accordingly, an object of the present invention is to provide a branch joint that has good operability in a narrow place and has excellent airtightness.

In order to achieve the above object, the present invention includes an upper body and a lower body fastened to an outer peripheral surface of a main pipe, and the lower main body is capable of communicating with the main pipe and having an detachable end portion. A branch part sealed with a lid member and a branch pipe housing part extending in a direction intersecting the main pipe from the branch part, and a perforated member driven upward is inserted into the branch part, A fireproof seal member that is in close contact with the main pipe is fitted to the side body, and the branch portion, the perforated member, and the branch portion and the lid member are sealed with a seal member. It is.
In the present invention, it is preferable that a seal packing is fitted around the fireproof seal member. In the present invention, it is more preferable that a screw member that contacts the main pipe is attached to the upper main body and the lower main body.

  According to the present invention, since no explosive is used, there is no limit on the expiration date before construction, and stable supply is possible, and piping construction can be performed without large sound or vibration of piping, and further explosive force. It is also possible to prevent drilling interruption due to lack. Moreover, according to the present invention, the piercing member inserted in the lower body after removing the lid member is driven upward, and the piercing member is returned to the original position and then the lid member is attached again. The branch pipe can be removed from the main pipe.

  Details of the present invention will be described below with reference to the accompanying drawings. 1 is a perspective view showing an example of indoor piping using the branch joint of the present invention, FIG. 2 is a cross-sectional view showing the branch joint according to the embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along line AA of FIG. 4 is a cross-sectional view showing a use state of the branch joint of FIG.

  In the indoor pipe shown in FIG. 1, a branch pipe 2 is connected to a main pipe 1 disposed behind the ceiling via a branch joint 3, and an intermediate gas plug 20 is provided in the middle of the branch pipe 2. This branch joint 3 has a structure shown in FIG. 2 and FIG. 3 (state after the end of branching). The branch joint 3 has an upper body 5 and a lower body 6 that are fastened by two sets of hexagon socket head cap bolts 4. The upper body 5 has a saddle portion 51 circumscribing the main tube 1 and fastening portions 52 into which a plurality of (four in the figure) hexagon socket head bolts 4 are screwed. The lower main body 6 has a saddle portion 61 circumscribing the main tube 1 and tightening portions 62 into which the hexagon socket head cap bolts 4 are inserted at both ends thereof. A branch portion 64 having a communication hole 63 extending downward from the main tube 1 is formed in the saddle portion 61, and a branch tube receiving portion 65 extending from the main tube 1 in a direction orthogonal to the main tube 1 (as viewed from the plane) is formed. The distal end of the branch pipe 2 is screwed into the branch pipe receiving portion 65. Inside the branching portion 64, a forsaw 7 having a saw blade 71 on one end face and a driving portion 72 on the other end is inserted. The cap 8 is screwed to the outer periphery of the reduced diameter portion 66 formed at the end of the branching portion 64, and two circumferential grooves 67 and 67 are formed on the inner peripheral surface of the reduced diameter portion 66. A pair of O-rings 91 and 91 are fitted therein. A circumferential groove 68 is also provided on the surface of the inner peripheral surface of the cap 8 that contacts the reduced diameter portion 66, and an O-ring 92 is fitted therein. A circumferential groove 68 surrounding the non-perforated portion 1a of the main tube 1 is formed in the saddle portion 61 of the lower main body 6, and a fireproof packing 93 and a seal packing 94 that are in close contact with the outer peripheral surface of the main tube 1 are fitted therein. Has been. The upper main body 51 and the lower main body 61 are formed of a material having high rigidity, for example, a steel material (for example, malleable cast iron), so that the hexagon socket head cap screw 4 can be firmly fastened and fixed to the main tube 1. Further, the cap 8 is also formed of a material having high rigidity, for example, a steel material (SS material or the like) so that the cap 8 can be firmly fixed to the lower body 61. The O-rings 91 and 91, the metal seal 92, and the seal packing 94 are formed of a gen-based special rubber {for example, nitrile rubber (NBR)} excellent in oil resistance, water resistance, gas resistance, and the like. For example, it is formed of a mixture of nitrile rubber (NBR) and expanded graphite.

  According to the above-mentioned branch joint, piping can be performed as shown in FIG. The upper body 5 and the lower body 6 are fastened and fixed to the branch portion of the main pipe 1 with hexagon socket head cap screws 4. The branch pipe 2 is screwed into the branch pipe receiving portion 65 of the lower main body 6, and the intermediate gas stopper 20 (see FIG. 1) is installed in the middle of the branch pipe 2, and then the gas stopper is closed. On the other hand, after the adapter 14 is attached to the tip of the holder 13 held via the chuck 12 at the tip of the electric drill 11, the cap 8 is removed from the lower body 6, and the adapter 14 is inserted into the drive unit 72 of the hole saw 7. Connecting. Next, the electric drill 11 is rotated to raise the hole saw 7 and pierce the main tube 1. Then, the adapter 14 is pulled out from the drive unit 72 to return the hole saw 7 to its original position. Put the lid on. Although the connecting portion between the horusoe 7 and the adapter 14 moves up and down, gas leakage to the outside during this time can be prevented by installing two O-rings 91 at a distance. By this upward drilling operation, the slices and chips generated from the main tube 1 fall into the communication hole 63 and are accommodated therein, so that normal gas flow is not hindered. The electric drill 11 is preferably an explosion-proof electric drill considering that it is used in gas piping.

  According to the above-mentioned branch structure, indoor branch piping can be performed without using a branch joint with a built-in explosive, so piping can be constructed without large sound and vibration, and there is no need to have a large inventory. No restrictions on the expiration date before construction. Furthermore, there is an advantage that there is no interruption of drilling. Moreover, according to the above structure, the contact surface between the main pipe 1 and the upper body 5 is sealed by the seal packing 94 and the fireproof packing 93, and the O-ring 91 is provided on the sliding surface between the lower joint body 6 and the hole saw 7. , 91 are fitted, so that gas leakage can be reliably prevented. Thereby, it becomes possible to perform a drilling operation with the gas stopper 20 opened. Moreover, since the fireproof packing 93 is attached to the contact surface between the main pipe 1 and the upper body 5, fire resistance required for indoor piping can be imparted.

  In the case where the main pipe 1 is a color steel pipe coated with a thermoplastic resin (for example, vinyl chloride), a hexagon socket set screw 10 (see FIG. 2) until the tip abuts (preferably bites) the base pipe into the joint body. It is preferable to screw in (shown by a broken line and a chain line). Thereby, even when the thermoplastic resin disappears due to a fire, the positional relationship between the upper body 5 and the lower body 6 with respect to the main pipe 1 does not change, and the gap is filled by the thermal expansion of the fireproof packing 93. It becomes possible to prevent gas leakage (backside leakage) from the gap with the branch joint 3.

It is a perspective view which shows an example of indoor piping which uses the branch joint of this invention. It is a half longitudinal section showing a branch joint concerning an embodiment of the invention. FIG. 1 is a half sectional view taken along line AA in FIG. It is a half longitudinal cross-sectional view which shows the use condition of the branch joint of this invention.

Explanation of symbols

1: Main pipe, 1a: Non-perforated part, 2: Branch pipe, 20: Intermediate gas stopper, 3: Branch joint, 4: Hexagon socket head cap screw, 5: Upper body, 51: Saddle part, 52: Fastening part, 6 : Lower main body, 61: Saddle part, 62: Fastening part, 63: Communication hole, 64: Branch part, 65: Branch pipe receiving part, 66: Reduced diameter part, 67: Circumferential groove, 7: Horso, 71: Cutting edge part, 72: drive part, 8: cap, 81: circumferential groove, 91: O-ring, 92: metal seal, 93: fireproof packing, 94: seal packing, 10: hexagon socket set screw, 11: electric Drilling machine, 12: adapter, 13: holder, 14: chuck

Claims (3)

An upper body and a lower body that are fastened to the outer peripheral surface of the main pipe are provided, and the lower main body includes a branch section that is in communication with the main pipe and is sealed with a detachable lid member at an end portion and the branch section. A fire resistance that has a branch pipe housing portion extending in a direction intersecting with the main pipe, is inserted with a perforated member that is driven upward in the branch section, and is in close contact with the lower main body to the main pipe A branch joint, wherein a seal member is fitted, and the branch portion, the perforating member, and the branch portion and the lid member are sealed with a seal member. The branch joint according to claim 1, wherein a seal packing is fitted around the fireproof seal member. The branch joint according to claim 2, wherein a screw member that contacts the main pipe is attached to the upper main body and the lower main body.

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