JP6921697B2 - Construction jigs and branch pipe construction methods - Google Patents

Description

The present invention relates to a construction jig and a method of constructing a branch pipe.

Conventionally, for example, a cold / hot water pipe for an air conditioner configured by a main pipe is known.
In such a cold / hot water pipe, a branch pipe may be connected to the main pipe to branch the flow path. In this case, for example, as shown in Patent Document 1 below, with the branch pipe connected to the main pipe, the cutting tool is fixed to the branch pipe with a fixing jig, and the main pipe is drilled from the inside of the branch pipe. Is done.

JP-A-2015-197152

However, in the conventional construction method, the cutting resistance received by the blade when drilling the main pipe is applied to the fixing jig via the blade, so that the fixing jig is separated from the branch pipe and the main pipe is separated. There was a problem with perforation.
In particular, when the main pipe has a fiber reinforced layer reinforced with glass fiber or the like, the cutting resistance at the time of drilling the main pipe becomes large, so that the above-mentioned problems are likely to occur.

The present invention has been made in view of the above-mentioned circumstances, and is for construction work capable of smoothly drilling the main pipe even if the cutting resistance received by the cutting tool when drilling the main pipe is large. It is an object of the present invention to provide a method of constructing a jig and a branch pipe.

In order to solve the above problems, the present invention proposes the following means.
The construction jig according to the present invention is a construction jig for connecting a branch pipe to a main pipe through which a liquid flows inside, which constitutes a cold / hot water pipe, and is an insertion pipe through which the branch pipe is inserted. A first member having a portion and a second member that sandwiches the main with the first member and fixes the first member to the main, and the second member is attached to the main. It is characterized in that, in a state where the first member is fixed, it has a rigidity equal to or higher than that of the first member in the pipe axial direction of the insertion pipe portion.

Further, the method of constructing a branch pipe according to the present invention is a method of constructing a branch pipe for connecting a cold / hot water pipe to a main pipe through which liquid flows inside by using the above-mentioned construction jig. The fixing step of fixing the first member to the main pipe together with the branch pipe by the second member in a state where the branch pipe is inserted into the insertion pipe portion of the first member, and the fixing step. After the branch pipe connecting step of connecting the branch pipe to the main pipe and the branch pipe connecting step, the main pipe remains fixed to the main pipe by the second member. It is characterized by comprising a drilling step of drilling from the inside of the branch pipe.

According to these inventions, the first member and the second member of the construction jig sandwich the main pipe, and the second member has a rigidity equal to or higher than that of the first member with respect to the pipe axial direction of the insertion pipe portion. Is equipped with. Therefore, even if a large cutting resistance is applied to the first member through the cutting tool when the main pipe is drilled with the cutting tool from the inside of the branch pipe inserted into the insertion pipe portion, the second member provides the second member. It is possible to support one member in the pipe axis direction of the insertion pipe portion, and it is possible to prevent the first member from being separated from the main pipe. As a result, the main can be smoothly perforated.

Further, in a state where the first member is fixed to the main pipe by the second member together with the branch pipe, the branch pipe is connected to the main pipe and the main pipe is drilled as it is. The first member and the second member can serve as a jig for fixing the branch pipe to the main pipe and a jig for fixing the branch pipe to the main pipe in the drilling process, so that the jig can be shared. It is possible to simplify the work in each process. As a result, the branch pipe can be efficiently constructed.

Further, the first member may include a protruding portion extending in the direction of the pipe axis, and the second member may include an engaging portion that engages with the protruding portion in the direction of the pipe axis.

In this case, the protruding portion of the first member and the engaging portion of the second member are engaged in the pipe axis direction of the insertion pipe portion, and this direction coincides with the direction of the cutting resistance from the cutting tool. Therefore, when the cutting resistance from the cutting tool is applied to the first member, it is possible to reliably suppress the misalignment of the first member and the second member. As a result, the main can be drilled more smoothly.

According to the present invention, even if the cutting resistance received by the cutting tool from the main pipe when drilling the main pipe is large, the main pipe can be smoothly drilled.

It is the schematic of the air-conditioning apparatus provided with the cold-hot water piping in which the construction jig of this invention is used. It is sectional drawing which shows the state which attached the construction jig which concerns on one Embodiment of this invention to a main pipe. It is sectional drawing which shows the modification of the 1st member shown in FIG.

(First Embodiment)
Hereinafter, the construction method of the construction jig 1 and the branch pipe 16 according to the first embodiment of the present invention will be described with reference to FIG. The drawings used in the following description are schematic, and the length, width, thickness ratio, etc. are not always the same as the actual ones and can be changed as appropriate.

As shown in FIG. 1, the construction jig 1 according to the present embodiment is used when forming a cold / hot water pipe 50 of an air conditioner and connecting a branch pipe 16 to a main pipe 15 through which a liquid flows inside. .. The cold / hot water pipe 50 is piped by connecting the branch pipe 16 to the main pipe 15.
Here, first, the air conditioner 100 including the cold / hot water pipe 50 will be described.

As shown in FIG. 1, the air conditioner 100 includes a hot / cold water pipe 50, a hot water boiler 60, a refrigerator 70, a fan coil unit 80, an air handling unit (AHU) 90, an expansion tank 95, and a cooling tower 110. ing. The entire pipeline for transporting cold / hot water entering and exiting the fan coil unit 80 is composed of a main pipe 15. In the following description, the direction along the pipe axis O1 of the main pipe 15 is referred to as the first axial direction, the direction orthogonal to the pipe axis O is referred to as the radial direction, and the direction orbiting around the pipe axis O is referred to as the circumferential direction.

The main pipe 15 includes an inner layer, an intermediate layer, and an outer layer. The inner layer is located on the innermost side in the radial direction. The intermediate layer and the outer layer are laminated on the outer peripheral surface of the inner layer in this order.
The inner layer and the outer layer are formed of a polyolefin-based resin material such as a polybutene resin, a high-density polyethylene resin, a medium-density polyethylene resin, and a polypropylene resin.
The intermediate layer is a fiber reinforced layer and is formed of a polyolefin resin material and glass fiber. Since the intermediate layer is a fiber reinforced layer containing glass fibers, the main 15 has strength.

Further, the main pipe 15 includes a functional layer laminated on the outer side in the radial direction of the outer layer. The functional layer includes an adhesive layer and a gas barrier layer. The adhesive layer and the gas barrier layer are laminated on the outer peripheral surface of the outer layer in this order.
The adhesive layer adheres the gas barrier layer to the outer peripheral surface of the outer layer in the main pipe 15. The gas barrier layer contains a gas barrier resin, and imparts gas barrier properties to the main pipe 15.

The thickness of the adhesive layer is, for example, 50 μm or more, preferably 75 μm or more, 200 μm or less, and preferably 150 μm or less. The thickness of the adhesive layer is not limited to such an embodiment and can be arbitrarily changed.
The thickness of the gas barrier layer is, for example, 75 μm or more, preferably 100 μm or more, 200 μm or less, and preferably 150 μm or less. The thickness of the gas barrier layer is not limited to such an embodiment and can be arbitrarily changed. Further, the main pipe 15 does not have to have a functional layer.

As shown in FIG. 2, the branch pipe 16 is provided with a base portion 16A connected to a part of the main pipe 15 in the circumferential direction. The base portion 16A is formed integrally with the branch pipe 16.
The base portion 16A has a rectangular shape when viewed from one of the radial directions, and has an arcuate plate shape which is curved in the circumferential direction along the outer peripheral surface of the main pipe 15 when viewed from the axial direction. Flange portions 16B extending so as to intersect with the branch pipe 16 are separately provided at both ends of the base portion 16A in the circumferential direction. In the illustrated example, the flange portion 16B is orthogonal to the branch pipe 16.
The branch pipe 16 extends along the radial direction with the base portion 16A connected to the main pipe 15. The branch pipe 16 is connected to the central portion of the base portion 16A in a side view seen from the one direction. The inside of the branch pipe 16 can communicate with the main pipe 15.

The base portion 16A and the branch pipe 16 are integrally formed. The base portion 16A and the branch pipe 16 are formed of an olefin resin material such as a polybutene resin, a high-density polyethylene resin, a medium-density polyethylene resin, or a polypropylene resin. The base portion 16A includes a heating wire (not shown) embedded in the inner peripheral surface side of the peripheral wall, and a connector mounting portion (not shown) protruding outward from the outer peripheral surface.

The connector mounting portion is for mounting a cable connector such as a fusion splicer and passing an electric current through the heating wire. The connector mounting portion is integrally formed with the base portion 16A. The connector mounting portions are separately arranged at both ends in the pipe axis direction on the outer peripheral surface of the base portion 16A. Then, the pair of connector mounting portions are conducted by a heating wire.

The heating wire is arranged on the inner peripheral surface of the base 16A. The heating wire is arranged so as to orbit around the branch pipe 16 a plurality of times in a cross-sectional view seen from the one direction.
Then, in a state where the inner peripheral surface of the base portion 16A is in contact with the outer peripheral surface of the main pipe 15, heat is generated by energizing the heating wire, and the portion of the inner peripheral surface of the base portion 16A located around the heating wire. The base portion 16A and the main pipe 15 are connected by melting the resin of the above and the outer peripheral surface surface layer of the main pipe 15.

The construction jig 1 has a first member 10 having an insertion pipe portion 12 through which the branch pipe 16 is inserted, sandwiches the main pipe 15 together with the first member 10, and fixes the first member 10 to the main pipe 15. It includes two members 20 and.
The first member 10 is formed of, for example, a metal material or the like. The first member 10 includes an arc plate-shaped support plate 11 extending along the outer shape of the branch pipe 16 and an insertion pipe portion 12 protruding from the support plate 11. The insertion pipe portion 12 is connected to the central portion of the support plate 11 in a plan view orthogonal to the pipe axis O2. In the following description, the direction along the pipe axis O2 of the insertion pipe portion 12 is referred to as the second axial direction (the pipe axis direction of the insertion pipe portion 12).

In the present embodiment, the second member 20 has a rigidity equal to or higher than that of the first member 10 in the second axial direction in a state where the first member 10 is fixed to the main pipe 15. The second member 20 is arranged together with the first member 10 at a position sandwiching the main pipe 15 in the second axial direction. In the illustrated example, the second member 20 has a chain shape. The central portion of the second member 20 in the circumferential direction comes into contact with the outer peripheral surface of the main pipe 15. The second member 20 is made of a metal material such as stainless steel. Therefore, high rigidity can be exhibited in the second axial direction.
A pair of fixing portions 21 are separately arranged at both ends of the second member 20 in the circumferential direction. An operation unit 22 for rotatably operating the fixing portion 21 is arranged on one of the fixing portions 21.

Further, in the present embodiment, the first member 10 includes a protruding portion 13 extending so as to intersect the second axial direction. The protruding portions 13 are separately arranged at both ends of the support plate 11 in the circumferential direction. The protruding portion 13 is a plate-shaped member whose front and back surfaces face in the second axial direction.
The second member 20 includes an engaging portion 23 that engages with the protruding portion 13 in the second axial direction. The engaging portion 23 is provided at the end portion of the fixing portion 21 in the circumferential direction. The engaging portion 23 sandwiches the protruding portion 13 in the second axial direction together with the flange portion 16B in the base portion 16A of the branch pipe 16.

Next, a method of constructing the branch pipe 16 using the construction jig 1 on the main pipe 15 will be described.
The method of constructing the branch pipe 16 according to the present embodiment includes a fixing step of fixing the first member 10 to the main pipe 15 together with the branch pipe 16 by the second member 20, and a branch pipe 16 to the main pipe 15 after the fixing step. It includes a branch pipe connecting step for connecting, and a drilling step for drilling the main pipe 15 from the inside of the branch pipe 16 after the branch pipe connecting step.

In the fixing step, the inner surface of the support plate 11 of the first member 10 is inserted while the branch pipe 16 is inserted into the insertion pipe portion 12 of the first member 10 in a state where the flow of the liquid inside the main pipe 15 is temporarily blocked. Is brought into contact with the outer peripheral surface of the base portion 16A of the branch pipe 16 and the inner surface of the base portion 16A is brought into contact with the outer peripheral surface of the main pipe 15.
Then, the main pipe 15 is surrounded by the second member 20 from the outside in the radial direction, the main pipe 15 is sandwiched between the first member 10 and the second member 20, and the engaging portion 23 of the second member 20 is the first member. Each of the protrusions 13 of 10 is engaged with each other separately. At this time, the engaging portion 23 can be engaged with the protruding portion 13 while operating the operating portion 22 of the second member 20.

Next, in the branch pipe connection step, a cable connector such as a fusion splicer is attached to a connector attachment portion provided on the outer peripheral surface of the base portion 16A to energize the heating wire. As a result, the base 16A is connected to the main pipe 15.
Finally, in the drilling step, a drilling blade is inserted into the inside of the branch pipe 16 to drill the main pipe 15 from the inside of the branch pipe 16. At this time, the drilling work is performed with the first member 10 fixed to the main pipe 15 by the second member 20. Here, for example, a drilling tool provided with a blade at the tip is fitted to the insertion pipe portion 12, and the blade is made to enter in the second axial direction by rotating the handle, thereby punching the outer peripheral surface of the main pipe 15. May be good. As a result, the inside of the main pipe 15 and the inside of the branch pipe 16 are in a state of communicating with each other. After that, by removing the first member 10 and the second member 20 from the main pipe 15, the construction work of the branch pipe 16 is completed.

Next, a modified example of the first member 10B in the construction jig 1 will be described.
As shown in FIG. 3, in the first member 10B according to the modified example, the insertion tube portion 12B is formed in a multi-stage shape. A reduced diameter portion having a reduced outer diameter is formed in a portion of the insertion tube portion 12B located on the opposite side of the support plate 11B along the second axial direction. A male threaded portion 17 is formed in the reduced diameter portion of the insertion tube portion 12B. The drilling tool can be firmly fixed to the first member 10 by using the male screw portion 17. At the outer end of the protruding portion 13B of the insertion tube portion 12B, return portions 18 projecting in the second axial direction are separately formed.

A rib 19 is formed on the outer surface of the support plate 11B of the first member 10B facing the second axial direction. A pair of ribs 19 are arranged symmetrically with respect to the pipe axis O2 of the insertion pipe portion 12. The rib 19 is integrally formed from the base end portion of the insertion tube portion 12B on the support plate 11B side to the protruding portion 13B.
Since the rib 19 is formed on the support plate 11B in this way, it is possible to prevent the support plate 11 from being deformed in the second axial direction starting from the connection portion with the insertion pipe portion 12.

As described above, according to the construction jig 1 according to the present embodiment, the first member 10 and the second member 20 in the construction jig 1 sandwich the main pipe 15, and the second member 20 is inserted. It has a rigidity equal to or higher than that of the first member 10 in the second axial direction along the pipe shaft O2 of the pipe portion 12. Therefore, even if a large cutting resistance is applied to the first member 10 via the cutting tool when the main pipe 15 is drilled from the inside of the branch pipe 16 inserted through the insertion pipe portion 12 with the cutting tool, the first member 10 The two members 20 make it possible to support the first member 10 in the second axial direction. As a result, it is possible to prevent the first member 10 from being separated from the main pipe 15, and the main pipe 15 can be smoothly perforated.

Further, in a state where the first member 10 is fixed to the main pipe 15 together with the branch pipe 16 by the second member 20, the branch pipe 16 can be connected to the main pipe 15 and the drilling step of the main pipe 15 can be performed as it is. Therefore, the jig for fixing the branch pipe 16 to the main pipe 15 in the branch pipe connecting step and the jig for fixing the branch pipe 16 to the main pipe 15 in the drilling step are the first member 10 and the first member. The two members 20 can be combined. Therefore, by sharing the jig, the work in each process can be simplified, and the branch pipe 16 can be efficiently constructed.

Further, the first member 10 includes a protruding portion 13 extending so as to intersect the second axial direction, and the second member 20 includes an engaging portion 23 that engages with the protruding portion 13 in the second axial direction. Therefore, the protruding portion 13 of the first member 10 and the engaging portion 23 of the second member 20 are engaged in the second axial direction along the pipe axial direction of the insertion pipe portion 12, and this direction is from the cutting tool. It matches the direction of cutting resistance. Therefore, when the cutting resistance from the cutting tool is applied to the first member 10, it is possible to surely prevent the first member 10 and the second member 20 from being displaced. As a result, the main 15 can be drilled more smoothly.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in each of the above embodiments, the example in which the cold / hot water pipe 50 is used for the air conditioner 100 has been shown, but the present invention is not limited to such an embodiment. The cold / hot water pipe 50 includes, for example, a hot water supply pipe for a water heater such as a gas water heater and a hot water boiler, a hot water supply pipe for an apartment house or a detached house, a humidified water supply pipe for a humidifier, and a pipe for an ice heat storage type heat exchanger. It can also be applied to. Further, a liquid other than water may flow as a refrigerant inside the cold / hot water pipe 50.

Further, in the above embodiment, the first member 10 includes a protruding portion 13 extending so as to intersect the second axial direction, and the second member 20 engages with the protruding portion 13 in the second axial direction. Although the configuration including 23 is shown, the present invention is not limited to such an aspect. The first member 10 may not include the protrusion 13 and the second member 20 may not include the engaging portion 23.

Further, in the above embodiment, the configuration in which the second member 20 is a chain-shaped member is shown, but the present invention is not limited to such a mode. The second member 20 may have a clamp shape, for example, or may have another shape.

In addition, it is possible to replace the components in the embodiment with well-known components as appropriate without departing from the spirit of the present invention, and the above-mentioned modifications may be appropriately combined.

1 Construction jig 10 1st member 12 Insertion pipe part 13 Protruding part 15 Main pipe 16 Branch pipe 20 2nd member 23 Engagement part O2 2nd axial direction (pipe axial direction of insertion pipe part 12)

Claims (3)

It is a construction jig for connecting a branch pipe in which a base connected to the outer peripheral surface of the main pipe is integrally connected to the main pipe which constitutes a hot / cold water pipe and in which a liquid flows inside.
A first member having a support plate whose inner surface abuts on the outer peripheral surface of the base portion and an insertion pipe portion which protrudes from the support plate and into which the branch pipe is inserted.
A second member that sandwiches the main with the first member and fixes the first member to the main is provided.
The second member is characterized in that, in a state where the first member is fixed to the main pipe, the second member has a rigidity equal to or higher than that of the first member in the pipe axial direction of the insertion pipe portion. Construction jig. The first member includes a protrusion extending so as to intersect the pipe axis direction.
The construction jig according to claim 1, wherein the second member includes an engaging portion that engages with the protruding portion in the pipe axis direction. It is a method of constructing a branch pipe that connects a branch pipe to a main pipe that constitutes a hot / cold water pipe and a liquid flows inside by using the construction jig according to claim 1 or 2.
A fixing step of fixing the first member to the main pipe together with the branch pipe by the second member in a state where the branch pipe is inserted into the insertion pipe portion of the first member.
After the fixing step, a branch pipe connecting step of connecting the branch pipe to the main pipe and
After the branch pipe connecting step, a drilling step of drilling the main pipe from the inside of the branch pipe while keeping the first member fixed to the main pipe by the second member is provided. A characteristic branch pipe construction method.

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