JP6285780B2 - Method of joining branch joint to existing pipe and drilling jig - Google Patents

Description

  The present invention relates to a method for joining a branch joint to an existing pipe and a drilling jig.

  In houses and other buildings with multiple floors, after plumbing pipes for gas pipes and water and sewage plumbing, branch pipes and horizontal pipes are connected to the vertical pipes under the floor slabs on each floor and piped to each house. ing. As a method of joining a branch pipe to this vertical pipe or a method of constructing a vertical pipe provided with a branch pipe, for example, a method disclosed in Patent Document 1 below has been conventionally employed.

In Patent Document 1, a vertical pipe with a branch pipe joint (cheese pipe) is prepared at one end, a vertical pipe is inserted from the lower floor to the upper floor, and the other end of this vertical pipe is prepared at the upper floor. A method of connecting and fusing to other joints with branch pipes is disclosed.
That is, Patent Document 1 discloses a method of connecting a cheese tube to a vertical tube that has been cut in advance to a predetermined length, and sequentially connecting other vertical tubes to the cheese tube, and is widely adopted. ing.

JP 2006-105389 A

However, according to the prefabrication method for piping described in Patent Document 1, since the vertical pipe provided with the branch joint is arranged by the above-described method, the junction position of the branch joint with respect to the vertical pipe can be freely set. There is a problem that the degree is low, and it takes time to perform the construction of the vertical pipe and the branch joint sequentially on each floor.
Therefore, the present invention provides a method of joining a branch joint to an existing pipe and a drilling jig with a high degree of freedom in the joining position of the branch joint with respect to the pipe and good placement efficiency.

The present invention employs the following means in order to solve the above problems.
According to the method of joining the branch joint of the present invention to the existing pipe, the branch joint provided with the arcuate plate-shaped saddle portion and the branch pipe projecting from the saddle portion is fixed to the previously installed pipe. A first step, a second step of mounting a fixing jig for supporting the branch joint in the axial direction of the saddle portion on the branch joint fixed to the pipe, and a core for centering the branch pipe on the fixing jig. And a third step of attaching a setting jig, and a fourth step of fixing a punching tool to the centering jig and forming an opening in the pipe to communicate with the inner hole of the branch pipe. And
According to this configuration, the branch joint is fused to an arbitrary position of the pipe without cutting the existing pipe, and the inner pipe of the branch pipe is formed along the centering jig while preventing the pipe from being bent. The peripheral wall portion of the corresponding pipe can be drilled.

In the method for joining a branch joint to an existing vertical pipe according to the present invention, the second step is formed with a recess through which a part of the branch joint and the pipe are inserted in the axial direction of the pipe. Using a fixing jig having a locking part to be locked to the pipe, the branch joint fixed to the pipe is relatively inserted into the recess of the fixing jig, and the locking part is locked to the branch joint. It may be attached by being suspended.
According to this configuration, the fixing jig can be fixed to the branch joint simply by inserting a part of the saddle portion and the pipe into the recess of the fixing jig and suspending the fixing jig from the branch joint.

The drilling jig of the present invention is mounted on a fixing jig that supports a branch joint including an arc plate-like saddle part and a branch pipe projecting from the saddle part in the axial direction of the saddle part, and the fixing jig. And a centering jig for centering the branch pipe.
According to this configuration, since the branch joint is supported in the axial direction of the saddle portion by the fixing jig, it is possible to prevent the branch joint and thus the pipe from being bent in the axial direction when the pipe is drilled.

The fixing jig of the present invention may include a recess that allows the branch joint and a part of the pipe to pass through in the axial direction of the pipe and includes a latching part that latches the branch joint.
According to this configuration, the fixing jig can be fixed to the branch joint simply by inserting a part of the saddle portion and the pipe into the recess of the fixing jig and suspending the fixing jig from the branch joint.

In the fixing jig of the present invention, an insertion hole having a circular cross section that is communicated with the recess and through which the centering jig is inserted is formed, and a female screw portion is formed on an inner peripheral surface of the insertion hole, The centering jig may be formed in a cylindrical shape, and a male screw portion may be formed on an outer peripheral surface thereof, and the centering jig may be detachably attached by screwing the centering jig into the insertion hole.
According to this configuration, the centering jig can be easily attached to and removed from the insertion hole by screwing.

  According to the joining method and the drilling jig of the branch joint according to the present invention, the branch joint can be fixed and drilled at an arbitrary position of the pipe without cutting the previously installed pipe. There is an effect that the degree of freedom of the joining position of the branch joint is increased. Further, the method of joining the branch joint to the existing pipe and the drilling jig according to the present invention can drill the wall portion of the pipe corresponding to the inner hole of the branch pipe along the centering jig while preventing the pipe from being bent. As a result, it is possible to easily join the branch joint to the pipe.

It is sectional drawing which looked at the drilling jig which concerns on embodiment of this invention by the XX line of FIG. It is a front view which shows the drilling jig which concerns on embodiment of this invention. It is a top view which shows the drilling jig which concerns on embodiment of this invention. It is sectional drawing which looked at the drilling jig which concerns on embodiment of this invention at the YY line | wire of FIG. It is a front view which shows the usage method of the drilling jig which concerns on embodiment of this invention. It is a front sectional view which shows the usage method of the drilling jig which concerns on embodiment of this invention.

  Hereinafter, with reference to an accompanying drawing, the form for carrying out the joining method to existing piping of a branch joint by the present invention, and a drilling jig is explained.

  A method for joining a branch joint to an existing pipe according to an embodiment of the present invention includes a branch joint including an arc plate-like saddle portion and a branch pipe projecting from the saddle portion. A first step of fixing to the pipe, a second step of attaching a fixing jig for supporting the branch joint in the axial direction of the saddle portion to the branch joint fixed to the pipe, and the branch pipe to the fixing jig. A third step of mounting a centering jig for centering, and a fourth step of fixing a punch to the centering jig and forming an opening in the pipe to communicate with the inner hole of the branch pipe. It is characterized by having.

  As shown in FIG. 1, the pipe 1 to which the present invention is applied is a pipe made of thermoplastic resin formed in a cylindrical shape. For example, the pipe 1 penetrates through each floor of a building (not shown) composed of a plurality of floors. As an example, a pipe installed in a pipe or a pipe installed in a horizontal direction in a building can be given. In the present embodiment, the embodiment will be described by taking, as an example, piping installed in the vertical direction so as to penetrate each floor of a building (not shown).

  As the branch joint 2 to which the present invention is applied, a saddle joint that includes a saddle portion 3 in the shape of an arc plate and a branch pipe 4 that protrudes from the saddle portion 3 and is molded from a thermoplastic resin is used. In the present embodiment, an electrofusion type saddle joint is used (hereinafter, the branch joint 2 is also referred to as “saddle joint 2” in the embodiment).

The arcuate plate-shaped saddle portion 3 has a built-in heating wire (not shown) such as a nichrome wire on the inner peripheral surface 3a side, and both ends of the heating wire connected to the outer peripheral surface 3b as shown in FIG. 9 and 9 are protruded so that they can be brought into contact with the outer peripheral surface 1b of the vertical tube 1 by energization to be fused.
Further, flanges 5 and 5 projecting outward in the radial direction are formed at both ends in the circumferential direction of the saddle portion 3 continuously in the direction of the axis L1.
The branch pipe 4 is a cylindrical pipe that protrudes from the center in the axis L1 direction of the outer peripheral surface 3b of the saddle portion 3, and an inner hole 4 a thereof opens at the inner peripheral surface 3 a of the saddle portion 3.

In the first step, the saddle portion 3 of the branch joint 2 is fixed to a vertical pipe (pipe) 1 disposed in the vertical direction (the depth direction in FIG. 1).
The method for fixing the saddle portion 3 to the vertical tube 1 is not particularly limited as long as the saddle portion 3 is firmly fixed to the vertical tube 1. In the present embodiment, the terminals 9, 9 shown in FIG. 4 of the saddle joint 2 are energized to heat a heating wire (not shown), the peripheral wall portion on the inner peripheral surface 3 a side of the saddle portion 3, and the vertical tube 1 in contact with this. The saddle portion 3 is fused to the vertical tube 1 by melting the peripheral wall portion on the outer peripheral surface 1b side and then cooling.
By the first step, the branch joint 2 is firmly fixed to the vertical pipe 1, and the fixing jig 10 can be attached to the branch joint 2 fixed to the vertical pipe 1.

In the second step, the fixing jig 10 that supports the branch joint 2 in the direction of the arcuate plate-shaped axis L1 of the saddle portion 3 is attached to the branch joint 2 fixed to the vertical pipe 1.
In this step, the fixing jig 10 is attached to the branch joint 2 so that the branch joint 2 and the vertical pipe 1 to which the branch joint 2 is fused are not bent and the centering jig 20 can be attached. ing.

  The fixing jig 10 may be attached to the branch joint 2 so as to be detachable so that the fixing jig 10 is securely fixed to the branch joint 2 and is not easily displaced in the axis L1 direction or the circumferential direction. As a specific mounting method, a method of clamping the saddle portion 3 or the vertical pipe 1 so as to be supported at a plurality of points by the fixing jig 10 or a method of hanging (locking) the fixing jig 10 to the saddle portion 3 is exemplified. . In the present embodiment, a method of suspending (locking) the fixing jig 10 to the saddle portion 3 is employed.

  By the second step, the fixing jig 10 is in a state of waiting for the centering of the branch pipe 4 in a state where the fixing jig 10 is fixed so as not to be deformed in the direction crossing the direction of the axis L1 of the saddle portion 3.

  As the fixing jig 10 to be attached to the branch joint 2, the centering jig 20 can be attached by giving rigidity, that is, a force against bending, in the directions of the axes L 1 and L 2 of the branch joint 2 and the vertical pipe 1. Although what kind of thing may be sufficient, in this embodiment, the fixing jig 10 mentioned later is used.

In the third step, a centering jig 20 for centering the branch pipe 4 is mounted on the fixed jig 10.
When the centering jig 20 is mounted on the fixed jig 10, the centering jig 20 is reliably positioned with respect to the fixed jig 10 so that the centering jig 20 is reliably positioned with respect to the axis L <b> 3 of the branch pipe 4. It only has to be detachably fixed to. Specific mounting methods include a method of screwing the centering jig 20 into the fixing jig 10, and a method of locking or fitting with a lock nut, magnet, bayonet or the like. In the present embodiment, a method of screwing the centering jig 20 into the fixed jig 10 is employed.

The centering jig 20 is formed with a through-hole 21 having a diameter that can be inserted straight while sliding the branch pipe 4 so that the branch pipe 4 can be centered. As long as the to-be-attached part 22 which matches the central axis L4 of the hole saw 31 of the punch 30 is formed, what kind of thing may be sufficient. In the present embodiment, a centering jig 20 described later is used.
By the third step, the peripheral wall portion P of the vertical pipe 1 closing the inner hole 4a of the branch pipe 4 can be punched.

In the fourth step, the punching tool 30 is fixed to the centering jig 20, and the opening 1 c is formed in the vertical pipe 1 to communicate with the inner hole 4 a of the branch pipe 4.
As a method of attaching the punching tool 30 to the centering jig 20, there is a method of fixing the mounting part 32 provided in the existing punching tool 30 to the attached part 22 provided in the centering jig 20. Specific fixing methods include fitting, screwing, gripping and other known locking methods.

As the punching tool 30, a well-known one having a hole saw 31, a mounting portion 32 to the centering jig 20, a shaft 33, a rotary drive 34 and a handle 35 can be used.
In order to form the opening 1 c in the vertical tube 1, the mounting portion 32 of the punching tool 30 is fixed to the mounted portion 22 of the centering jig 20, the rotary driving machine 34 is driven, the handle 35 is gripped, and the hole saw 31. Is pressed against the peripheral wall portion P of the vertical pipe 1 through the inner hole 4a of the branch pipe 4. Then, the horusoe 31 gradually cuts the peripheral wall portion P of the vertical pipe 1, and when the horuseau 31 passes through the peripheral wall portion P of the vertical pipe 1 and reaches the inner hole H of the vertical pipe 1, the branch pipe 4 and the vertical pipe 1 Communication is completed.

  At this time, a large pressing force is applied in a direction crossing the axis L2 of the vertical tube 1 (orthogonal in this embodiment) by pressing the handle 35 so as to press the hole saw 31 of the punch 30 against the vertical tube 1. However, the method for joining the branch joint 2 of the present invention to the existing vertical pipe 1 is to provide rigidity that can withstand bending in a direction in which the fixing jig 10 supports the saddle portion 3 in the direction of the axis L1 and crosses it. Yes.

  Therefore, according to the method of the present invention, when the vertical tube 1 is pressed in the direction intersecting the axis L1 by the punching tool 30, the vertical tube 1 bends in the horizontal direction (pressing direction) and escapes from the blade of the horusoe 31; There is an effect that it is possible to easily perforate the vertical tube 1 only by the force in the rotation direction, avoiding pushing the punching tool 30 back by the elastic restoring force of the vertical tube 1.

  Further, according to the method of the present invention, the fixing jig 10 is inserted into the saddle joint 2 relatively, and the fixing jig 10 may be suspended (locked) to the saddle portion 3. This can be facilitated, and the effect of improving the efficiency of the drilling operation can be obtained.

  Then, according to the method of the present invention, when the branch joint 2 is not previously attached to the vertical pipe 1 disposed in a building or the like (not shown), the vertical pipe 1 can be placed at any position without being cut. The effect that the saddle joint 2 can be joined is obtained.

In addition, according to the method of the present invention, as in the prior art, the vertical pipe 1 is cut to a length that reaches one upper floor from the lower floor, and the vertical pipe 1 is inserted through the floor slab in order from the lower floor; The trouble of alternately performing the operation of connecting the branch joint 2 of the cheese pipe can be saved.
That is, since the method of the present invention can perform the work of arranging the vertical pipes 1 over a plurality of floors and the work of installing the branch joint 2 at a predetermined position, the method has the branch joint 2. Construction of the vertical pipe 1 can be performed very efficiently.
Moreover, since it is not necessary to install the branch joint 2 from a lower floor, the effect that the freedom degree of work increases is acquired.

  The method of the present invention is shown not only in the case where the branch joint 2 is joined to the existing vertical pipe 1 but also in the above embodiment after the vertical pipe 1 is arranged over a plurality of floors when constructing a new building. It is also effective as a method of constructing a vertical pipe using a method of joining the branch joint 2 to the vertical pipe 1.

  According to this configuration, after arranging the vertical pipes over a plurality of floors, the branch joint can be joined at an arbitrary position where the horizontal pulling pipe is desired to be arranged. More specifically, the vertical pipe 1 having a length extending from the top floor to the bottom of the floor slab on the bottom floor is sequentially piped through the floor through holes provided in the floor slabs on the floors from the top floor or the bottom floor. Then, the branch joint 2 can be joined to an arbitrary position on each floor, and piping from the branch joint 2 can be performed.

Normally, in the construction of the floor through-hole of the floor slab, since the through-hole of the floor slab becomes a fireproof section, the vertical tube 10 at the through-hole is made of a thermally expanded refractory material that expands due to heat during a fire and closes the through-hole. However, in the method of the present invention, since the pipe construction of the vertical pipe 10 to the floor slab through-hole on each floor is completed with one construction, the fire-proof treatment at the floor slab through-hole on each floor is also efficient. Can be done automatically.

Next, the form for implementing the drilling jig 40 of this invention is demonstrated.
As shown in FIG. 1, a drilling jig 40 according to an embodiment of the present invention includes a saddle joint 2 having an arcuate plate-like saddle portion 3 and a branch pipe 4 protruding from the saddle portion 3. A fixing jig 10 that supports the L1 direction and a centering jig 20 that is attached to the fixing jig 10 and that centers the branch pipe 4 are provided.

FIG. 2 is a front view in which the fixing jig 10 and the centering jig 20 constituting the perforating jig 40 are separated, and FIG. 3 is a plan view in which the centering jig 20 is mounted on the fixing jig 10.
2 and 3, the fixing jig 10 is surrounded by a bottom surface 10a, a first side surface 10b rising from the bottom surface 10a, a fourth side surface 10e, and a top surface 10f formed on the opposite side of the bottom surface 10a. The actual rectangular parallelepiped member 11 is a member formed with a recess 12 through which the vertical pipe 1 and the branch joint 2 fixed to the vertical pipe 1 are inserted in one direction. The rectangular parallelepiped member 11 is formed of a highly rigid material such as aluminum, iron, or other metal.

4 is a cross-sectional view of the fixing jig 10 taken along the line YY shown in FIG.
The rectangular parallelepiped member 11 is formed in a size that can completely accommodate the saddle joint 2 therein. Specifically, the width of the outer shape of the rectangular parallelepiped member 11 is larger than the dimension from the tip of one flange 5 of the saddle portion 3 to the tip of the other flange 5 as shown in FIG. The dimension is larger than the height dimension from the lower end surface 5s of the flange 5 of the saddle joint 2 to the upper end surface 4t of the branch pipe 4, and as shown in FIGS. The saddle joint 2 is formed in a dimension larger than the length dimension in the direction of the axis L1.

  As shown in FIGS. 2 and 4, the rectangular parallelepiped member 11 has a vertical tube fitting portion 13 formed on the bottom surface 10 a side on which a substantially half portion (a part) in the circumferential direction of the vertical tube 1 is fitted, and an arrow. A first fitting recess 14 for expanding the flanges 5 and 5 into a rectangular shape symmetrically on the top surface 10f side of the longitudinal tube fitting portion 13 when viewed from the R direction (that is, the direction in which the first side surface 10b is viewed from the front); The second fitting recess 15 is narrower than the first fitting recess 14 and is symmetrically widened in a rectangular shape on the side of the top surface 10f of the first fitting recess 14 and narrower than the second fitting recess 15. A third fitting recess 16 is formed on the top surface 10f side of the second fitting recess 15 so as to extend symmetrically in a substantially rectangular shape.

The vertical tube fitting portion 13 is formed by denting the bottom surface 10a of the rectangular parallelepiped member 11 along the outer peripheral surface 1b of the vertical tube 1, and penetrates in the direction between the first side surface 10b and the third side surface 10d. ing.
The first fitting recess 14 is cut out so as to form a space having the same shape in the direction between the first side surface 10b and the third side surface 10d in accordance with the shape of the flanges 5 and 5 as viewed in the direction of arrow R. The first fitting recess 14 is formed up to the wall portion 17 formed on the third side surface 10d side.
The second fitting recess 15 and the third fitting recess 16 are sized to accommodate the saddle portion 3 and are formed between the second fitting recess 15 and the third fitting recess 16. K is formed so as to communicate with the wall portion 17 with a dimension setting in contact with the outer peripheral surface 3 b of the saddle portion 3.

The third fitting recess 16 is inserted through the branch pipe 4 in the direction between the first side face 10b and the third side face 10d by plane walls 16a, 16a facing each other that form a width dimension larger than the diameter of the branch pipe 4. It is formed to be able to.
As shown in FIG. 2 to FIG. 4, on the wall surfaces 16 a and 16 a facing each other forming the third fitting recess 16, a female screw is provided at a predetermined position in the direction between the first side surface 10 b and the third side surface 10 d. A curved surface on an arc having a portion 18 is formed, and is a mounting surface 19 of the centering jig 20. A region surrounded by the mounting surfaces 19 and 19 of the centering jig 20 and a virtual extension surface of the circumferential surface constitutes an insertion hole 29 of the centering jig 20 having a circular cross section on which the centering jig 20 is mounted. .

And the 1st fitting recessed part 14 to the 3rd fitting recessed part 16 are obstruct | occluded by the wall part 17 by the 3rd side surface 10d side. The wall portion 17 constitutes a locking portion 17 that contacts and locks one end of the saddle portion 3.
Further, the side wall portions 27 and 27 on the second side surface 10c side and the fourth side surface 10e side are formed continuously in the arrow R direction over the entire axis L1 direction of the saddle portion 3, and the saddle joint 2 is in the axis L1 direction. It is a wall that reinforces the rigidity.
The first fitting recess 14 to the third fitting recess 16 formed as described above are formed in a cross section (opening) shape substantially the same as the shape described above in the direction between the first side surface 10b and the third side surface 10d. The recess 25 is closed by the wall 17.

  The vertical tube fitting portion 13, the first fitting recess 14 to the third fitting recess 16 communicate in this order, and these constitute the recess 12.

As shown in FIG. 2, the centering jig 20 is inserted into an attachment portion 22 for fixing the attachment portion 32 of the punching tool 30 and an insertion hole 29 of the centering jig 20 with a larger diameter than the attachment portion 22. The large-diameter portion 23 is provided.
The attached portion 22 and the large-diameter portion 23 are formed with through holes 21 having substantially the same diameter as the outer diameter of the branch pipe 4 and allowing the branch pipe 4 to be inserted therethrough.
On the outer peripheral surface 23 a of the large diameter portion 23, a male screw portion 24 that can be screwed into the female screw portion 18 of the centering jig 20 mounting surface 19 is formed.

Next, a description will be given of a method of performing drilling that connects the branch pipe 4 of the branch joint 2 fixed to the vertical pipe 1 and the vertical pipe 1 using the drill jig 40.
As shown in FIG. 5, the branch joint 2 is fixed to a predetermined position of the vertical pipe 1.

  When the branch joint 2 is completely cooled and firmly fixed, the bottom surface 10a opened by the vertical tube fitting portion 13 is opposed to the vertical tube 1, and the vertical tube fitting portion 13 and the recess 25 of the fixing jig 10 are opened. The first side surface 10b is turned downward, and the saddle joint 2 is relatively inserted into the recess 12 until the upper end of the saddle portion 3 contacts the wall portion 17. Then, the flanges 5 and 5 of the saddle portion 3 are fitted into the first fitting recess 14, and the corner portion K abuts on the outer peripheral surface 3 b of the saddle portion 3, and the fixing jig 10 is suspended from the saddle joint 2 without wobbling. To be installed.

Next, as shown in FIG. 6, the large-diameter portion 23 of the centering jig 20 is directed to the insertion hole 29 of the centering jig 20, and the lower end surface 20 s of the centering jig 20 contacts the outer peripheral surface 3 b of the saddle portion 3. Screw in. Then, the branch pipe 4 is inserted into the through hole 21 of the centering jig 20, and the axis L1 of the branch pipe 4 by the centering jig 20 is determined and fixed.
Therefore, as shown in FIG. 1, the attachment portion 32 of the punching tool 30 is fixed to the attached portion 22 of the centering jig 20, and the rotary drive 34 is driven to push the handle 35 toward the vertical tube 1, At 31, the peripheral wall portion P of the vertical tube 1 is cut and opened.

  Thus, the drilling jig 40 of the present invention allows the saddle joint 2 to be relatively inserted through the recess 12 of the fixing jig 10, and the wall portion 17 is brought into contact with the end portion of the saddle portion 3 to be locked. The fixing jig 10 can be attached to the saddle joint 2. Accordingly, it is possible to obtain an effect that the mounting of the fixing jig 10 is very simple and the operation of drilling the vertical pipe 1 after the saddle joint 2 is fixed can be easily and efficiently performed.

  Further, in the drilling jig 40 of the present invention, the side wall portions 27 and 27 of the second side face 10c and the fourth side face 10e of the fixing jig 10 shown in FIG. 3 are formed over the entire axis L1 direction of the saddle joint 2. Therefore, it is possible to increase the rigidity of the saddle joint 2 and the longitudinal tube 1 in the directions of the axes L1 and L2, and to prevent bending in the direction crossing the axes L1 and L2. Therefore, even when the hole saw 31 of the punch 30 is pressed when the vertical tube 1 is drilled, the vertical tube 1 can be prevented from being bent and the vertical tube 1 can be easily drilled.

As mentioned above, although the joining method of the branch joint 2 of this invention to the vertical pipe 1, the arrangement | positioning method of the vertical pipe 1 provided with the branch joint 2, and the drilling jig 40 were demonstrated, this invention is what was demonstrated by the said embodiment. However, the present invention is not limited, and the present invention can be implemented by appropriately changing what is shown in the above embodiment.
Specifically, for example, in the fixing jig 10, the first fitting recess 14 to the third fitting recess 16 are each formed in a rectangular shape when viewed in the direction of the arrow R. The three fitting recesses 16 may be formed in the same shape as the flanges 5 and 5 of the saddle portion 3 and the arc plate shape.
Even when the first fitting recess 14 to the third fitting recess 16 are formed in this manner, the saddle portion 3 can be reliably fixed.

  The fixing jig 10 has a configuration in which the outer shape is formed in a rectangular parallelepiped shape. However, the fixing jig 10 is continuously formed in substantially the entire saddle portion 3 in the direction of the arrow R in the side wall portions 27 and 27. And a mounting portion (a configuration corresponding to the insertion hole 29 in the above embodiment) for mounting the centering jig 20 and a locking portion for locking the fixing jig 10 to the saddle joint 2. Any shape can be used. That is, the fixing jig 10 may be appropriately stealed according to the shape of the saddle joint 2 as long as it increases the rigidity of the saddle joint 2 in the direction of the axis L1, and is formed in any shape other than the rectangular parallelepiped shape. It may be what was done.

  Further, the punching jig 40 has a configuration in which the centering jig 20 is screwed into the insertion hole 29 of the fixing jig 10, but the centering jig 20 inserts the axis L3 of the branch pipe 4 and the hole saw 31 of the punching tool 30. As long as the through hole 21 of the centering jig 20 capable of aligning the axis L4 is formed, the mounting portion for the fixing jig 10 may not be the insertion hole 29. That is, the mounting of the centering jig 20 to the fixing jig 10 may be performed by concave / convex fitting to the fixing jig 10, clamping, or other methods.

Moreover, as the drilling jig 40 of the present invention, the drilling of the vertical pipe 10 installed in the vertical direction has been described, but the present invention is not limited to this.
That is, when the vertical tube 1 is pressed in the direction intersecting the axis L1 by the punch 30 with the punching tool 30, the vertical tube 1 bends in the horizontal direction and escapes from the blade of the horusoe 31. Since the saddle joint 2 can be joined by avoiding the punching tool 30 from being pushed back by the elastic restoring force, any pipe that branches in the horizontal direction can be applied. That is, the present invention can also be applied to a case where a horizontal pipe is crossed from a horizontal pipe that is piped in the left-right direction and the horizontal pipe is branched so that the pipe is branched in the horizontal direction.

  For example, the saddle joint 2 can be provided at an arbitrary position with respect to a horizontal pipe that continuously passes through a wall surface through opening provided on a wall surface that separates the rooms on the same floor. Even in this case, since the wall through-hole becomes a fireproof section in the construction of the wall through-hole in the wall surface, a thermal expansion refractory material that expands due to heat at the time of fire and closes the through-hole is wrapped around the horizontal pipe at the wall through-hole However, in the method of the present invention, since the pipe construction of the horizontal pipe to the wall through-hole in each room is completed with one construction, the fire-proof treatment at the wall through-hole in each room can be efficiently performed. it can.

1 Vertical pipe 2 Branch joint (saddle joint)
3 Saddle part 4 Branch pipe 10 Fixing jig 12 Recess 17 Wall part (locking part)
18 Female screw part 20 Centering jig 23a Outer peripheral surface 24 Male screw part 29 Insertion hole 30 Drilling tools L1, L2, L3 Axis line

Claims (5)

A first step of fixing a branch joint including an arc plate-shaped saddle portion and a branch pipe projecting from the saddle portion to a previously installed pipe;
A second step of attaching a fixing jig for supporting the branch joint in the axial direction of the saddle portion to the branch joint fixed to the pipe;
A third step of attaching a centering jig for centering the branch pipe to the fixing jig;
A fourth step of fixing a punching tool to the centering jig and forming an opening in the pipe that communicates with an inner hole of the branch pipe; and joining the branch joint to an existing pipe. Method.   The second step uses a fixing jig provided with a latching portion that is formed with a recess that allows the branch joint and a part of the pipe to be inserted in the axial direction of the pipe and is latched to the branch joint. The branch joint fixed to the pipe is inserted into the recess of the fixing jig relatively, and the latching portion is latched to the branch joint and is mounted by being suspended. The joining method of the branch joint of claim | item 1 to the existing piping. A fixing jig that supports a branch joint including an arc plate-like saddle portion and a branch pipe projecting from the saddle portion in the axial direction of the saddle portion;
A drilling jig, comprising: a centering jig mounted on the fixing jig for centering the branch pipe.   The fixing jig includes a recess for inserting a part of the branch joint and the pipe in an axial direction of the pipe, and a locking portion for locking the branch joint to the branch joint. Item 4. The drilling jig according to item 3. The fixing jig is formed with an insertion hole having a circular cross section through which the centering jig is inserted and communicated with the recess, and a female screw portion is formed on an inner peripheral surface of the insertion hole,
The centering jig is formed in a cylindrical shape, and a male screw portion is formed on the outer peripheral surface thereof.
The drilling jig according to claim 3 or 4, wherein the centering jig is screwed into the insertion hole to be detachable.

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