JP2003056780A - Branch pipe coupling and branch pipe connecting construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently discharge deposit accumulating in a fluid transport pipe to the outside through a through-hole of a lower pipe wall, to shorten a construction period, and to reduce construction costs. SOLUTION: A coupling body 3 is provided with a flow channel forming part 5 for forming a bypass flow channel 4 between it and the outer peripheral surface of the fluid transport pipe 1 in a communicating state with through-holes 1a and 1b formed in upper and lower wall parts of the fluid transport pipe 1, and a pipe part 7 for branch that communicates with the upper part of the bypass flow channel 4 and has a branch flow channel 6 opening upward along the axial direction of the upper through holes 1a. A blocking member 8 engaging with the upper through-holes 1a through the branch flow channel 6 has a length allowing storage of it in the branch flow channel 6. Facing parts between the inner peripheral surface of the pipe part 7 for branch and the outer peripheral surface of the blocking member 8 are provided with a removal preventing part 11 that engages from the axial direction of the upper through-holes 1a and prevents pulling movement of the blocking member 8 when the blocking member 8 is engaged with the upper through holes 1a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch pipe joint used when connecting equipment such as a fire hydrant or other pipes to a fluid transport pipe such as an existing water pipe, and a branch pipe connecting method using the same.

[0002]

2. Description of the Related Art In a conventional branch pipe connection method, for example, as shown in FIG. 15 (a), when a fire hydrant A is newly installed in an existing water pipe 1 as a fluid transport pipe, an upper pipe wall of the existing water pipe 1 is installed. And a flow passage forming portion 51 that forms a bypass flow passage 50 with the outer peripheral surface of the existing water pipe 1 in a state of being able to communicate with the through holes 1a and 1b formed in the lower pipe wall, and an upper portion of the bypass flow passage 50. To the outer periphery of the existing water pipe 1 and a branch pipe joint 52 having a branch pipe portion 52 that forms a branch flow path 49 that opens upward along the axial direction of both through holes 1a and 1b. A perforator C through a working sluice valve 53 that is fixed to a surface and has an inner space 53a larger than the outer diameter of the connecting flange 52a of the branch pipe 52 in the branch pipe 52 of the branch pipe joint B.
By the cylindrical cutter 9 of the perforator C, and through the opening of the work sluice valve 53 and the branch pipe portion 52 of the branch pipe joint B to the upper pipe wall and the lower pipe wall of the existing water pipe 1. Through holes 1a and 1b are formed, respectively.

Next, as shown in FIG. 15 (b), the work sluice valve 53 from which the perforator A is removed is passed through the branch pipe portion 52 and fitted into the upper through hole 1a of the existing water pipe 1. Connection flange 5 for connecting the member 54 and the on-off valve 55
Branch pipe 57 provided with 7b and both of these 54, 57
Attaching the inserter E, which is assembled with the shield plate 56 sandwiched between the connecting flanges 54a and 57a of FIG.
The upper through hole 1a of the existing water pipe 1 is closed by the closing member 54 inserted through the opening operation operation sluice valve 53 and the branch pipe portion 52 of the branch pipe joint B, and then the branch pipe portion 52. After the connection flange 52a and the connection flange 54a of the closing member 54 are tightened and fixed, the inserter E and the work sluice valve 53 are removed.

After that, as shown in FIG. 15C, after connecting the fire hydrant A to the upper connecting flange 57b of the branch pipe 57 through the on-off valve 55, the connecting flange 54a of the closing member 54 and the branch pipe 57 are connected. The shield plate 5 which is interposed between the lower connecting flange 57a and the lower connecting flange 57a is loosened.
6 is drawn out to connect the branch pipe 57 and the branch pipe portion 52 to each other, and then the joint flange 52a of the branch pipe portion 52, the joint flange 54a of the closing member 54 and the lower joint flange 57a of the branch pipe 57 are fastened together. It is fixed (see, for example, Japanese Patent Laid-Open No. 10-281379).

[0005]

In the conventional branch pipe connection construction method, since the fire hydrant A is connected to the existing water pipe 1 without interrupting the flow of tap water in the existing water pipe 1, there is no inconvenience such as water interruption. It can be installed without forcing the user, and tap water flowing out from the lower through hole 1b of the existing water pipe 1 is introduced into the branch passage 49 through the guide passage 50 of the branch pipe joint B to open the opening / closing valve 55. Since the water is discharged from the fire hydrant A by operation, sand, rust, and the like accumulated at the bottom of the existing water pipe 1 can be efficiently discharged along with the water flow accompanying the water discharge from the fire hydrant A.

However, when forming the through holes 1a and 1b in the upper pipe wall and the lower pipe wall of the existing water pipe 1, the work gate valve 53 is provided in the branch pipe portion 52 of the branch pipe joint B.
In addition, the insertion machine E must be attached to the insertion machine E, and a closing member 54 for closing the upper through hole 1a of the existing water pipe 1 through the branch pipe portion 52, a branch pipe 57 for attaching the opening / closing valve 55, and a shield. The plate 56 must be assembled beforehand,
In addition, the connection flange 54a of the closing member 54 and the branch pipe 5
The process of loosening the connection flange 57a of No. 7 and pulling out the shielding plate 56 interposed between them increases the number of construction equipment and the number of construction processes, which not only increases the construction period. , Construction costs will rise.

In addition, the upper end portion of the closing member 54 fitted in the upper through hole 1a of the existing water pipe 1 projects upward from the opening of the branch pipe portion 52, and the branch pipe portion 52 is connected to the upper end thereof. Connection flange 54a fixedly connected to the flange 52a
Are integrally formed, the weight of the branch pipe joint is increased, and the number of working steps is increased. Further, even as the work sluice valve 53, the flange joint of the branch pipe portion 52 and the closing member 54 is formed. A large size with an inner space 53a larger than the outer diameter is required, which requires a great deal of labor at the time of construction and also increases the excavation volume of the work pit, resulting in an increase in construction period and a rise in construction cost. It was a factor that promotes

Further, as disclosed in Japanese Unexamined Patent Publication No. 7-113489, a plate in which a closing member fitted in the upper through hole 1a of the existing water pipe 1 is curved with the same curvature as the peripheral wall of the existing water pipe 1. The plate-shaped closing member has a retaining elastic projection that engages with the outer peripheral surface side peripheral edge of the upper through hole 1a, and a retaining stopper that engages with the inner peripheral surface side peripheral edge of the upper through hole 1a. Although it may be possible to form a projection, in this case, since the closing member is curved in the three-dimensional direction with the same curvature as the peripheral wall of the existing water pipe 1, the upper through hole 1 of the existing water pipe 1 is formed.
It is very difficult to align a with the closing member, and moreover,
It cannot be used under the condition that the thickness of the existing water pipe 1 is changed due to the occurrence of rust bumps or the like on the inner peripheral surface of the existing water pipe 1.

The present invention has been made in view of the above situation, and its main problem is to efficiently discharge the deposit accumulated in the fluid transport pipe to the outside through the through hole of the lower pipe wall. The point is to provide a branch pipe joint and a branch pipe connection construction method that can achieve a shortened construction period and a reduced construction cost while being able to do so.

[0010]

According to a first aspect of the present invention, there is provided a joint main body which can be externally fitted and fixed to a fluid transport pipe.
A flow path forming portion that forms a bypass flow path with the outer peripheral surface of the fluid transport pipe in a state of communicating with the through holes formed in the upper pipe wall and the lower pipe wall of the fluid transport pipe, and in the upper part of the bypass flow passage. A branching pipe portion having a branch flow path that communicates with and is opened upward along the axial direction of the upper through hole is formed, and a closing member that is fitted into the upper through hole through the branch flow path is provided. In the branch pipe joint, the closing member is configured to have a length that can be accommodated in the branch flow path in a state of being fitted in the upper through hole, and the inner peripheral surface of the branching pipe portion and the outer periphery of the closing member. It is a point that a stopper portion is provided at a portion opposed to the surface so as to prevent the stopper member from being pulled out when the stopper member is fitted in the upper through-hole and is engaged in the axial direction of the upper through-hole. .

According to the above characteristic structure, when the closing member is fitted into the upper through hole of the fluid transport pipe through the branch flow passage of the branching pipe portion, the inner peripheral surface of the branching pipe portion and the outer peripheral surface of the closing member are formed. It is possible to prevent the retaining portions provided at the opposing portions from engaging with each other in the axial direction of the upper through hole and preventing the closing member fitted in the upper through hole from extracting and moving toward the opening side of the branch flow passage. it can.

Then, in a state in which the closing member fitted in the upper through hole of the fluid transport pipe is retained and retained, the fluid flowing out from the lower through hole of the fluid transport pipe flows with the outer peripheral surface of the fluid transport pipe. Since it flows out of the pipe joint through the bypass flow passage formed between the flow passage and the passage forming portion and the branch flow passage in the branch pipe portion, the deposit accumulated in the fluid transport pipe can be efficiently discharged to the outside. .

Therefore, since the lower end of the closing member is simply fitted into the upper through hole of the fluid transport pipe, it is not affected by rust lumps or the like generated on the inner peripheral surface of the fluid transport pipe, and Since the blocking member that receives the flow pressure in the fluid transport pipe is only engaged and received by the retaining portion provided at the portion where the branch pipe portion of the joint body and the blocking member face each other, the blocking member is fixed. No special work process is required, and the operation accuracy required for feeding the closing member is low, and the length of the closing member fitted in the upper through hole is set within the branch flow path. Therefore, the weight of the branch pipe joint can be reduced and the handling thereof can be facilitated.

Therefore, while the deposit accumulated in the fluid transport pipe can be efficiently discharged to the outside through the through hole of the lower pipe wall, the construction period can be shortened and the construction cost can be reduced. be able to.

The characteristic structure of the branch pipe joint according to claim 2 of the present invention prevents the closing member from escaping in a direction intersecting the axial direction of the upper through hole when the retaining portion is engaged. The point is that a movement restricting means is provided.

According to the above characteristic structure, since the retaining portion engages from the axial direction of the upper through hole, the closing member tends to escape in a direction intersecting the axial direction of the upper through hole at the start of the engagement. However, since the escape movement of the closing member can be blocked by the movement restricting means, it is possible to prevent the lower end portion of the closing member from being pressed against the peripheral edge of the upper through hole. Therefore, it is possible to surely and smoothly fit the closing member into the upper through hole of the fluid transport pipe while suppressing damage to the closing member.

According to a third aspect of the present invention, there is provided a characteristic feature of a branch pipe joint, wherein the closing member is made of hard synthetic rubber, and the retaining portion is provided on an inner peripheral surface of the branch pipe portion. It is composed of a locked portion and a locked portion protruding from the outer peripheral surface of the closing member.

According to the above-mentioned characteristic structure, even if the closing member is roughly manufactured, the elastic force of the closing member can be used to surely and smoothly fit the upper through hole of the fluid transport pipe and to close the closing member. The locked portion protruding from the outer peripheral surface of the member,
It is possible to surely and easily engage with the locking portion provided on the inner peripheral surface of the branch pipe portion.

According to a fourth feature of the branch pipe joint of the present invention, the upper end surface of the closing member is formed as an inclined surface along the flow direction of the fluid at a position corresponding to the communication between the bypass passage and the branch passage. There is a point.

According to the above characteristic structure, not only can the weight of the closing member be reduced and the handling can be facilitated, but
It is possible to sufficiently secure the flow passage cross-sectional area at the position corresponding to the communication between the bypass flow passage and the branch flow passage.

According to a fifth aspect of the present invention, there is provided a characteristic feature of a branch pipe joint, wherein the movement restricting means is provided with a restricting projection protruding from an outer peripheral surface of the closing member, and the restricting projection is provided along an axial direction of the upper through hole. And a guide portion provided on the inner peripheral surface of the branch pipe portion in a state of being guided by movement.

According to the above characteristic structure, when the closing member tries to escape in the intersecting direction due to the engagement in the retaining portion, the restricting projection and the branch pipe projecting on the outer peripheral surface of the closing member. It is possible to prevent escape movement of the closing member by contact with a guide portion provided on the inner peripheral surface of the portion, and to guide the closing member along the axial direction of the upper through hole in the regulated state. You can

Therefore, the blocking member can be reliably guided in the axial direction of the upper through hole along the branch flow path in the branch pipe portion, so that the blocking member for the upper through hole can be provided while the retaining portion is provided. It is possible to promote a reliable and smooth fitting operation.

According to a sixth aspect of the present invention, there is provided a characteristic feature of the branch pipe joint, wherein the movement restricting means is formed on the closing member in a state of being fitted into the upper through hole prior to the engagement of the retaining portion. It is composed of an extended fitting part.

According to the above characteristic structure, the extension fitting portion formed on the closing member is fitted into the upper through hole prior to the engagement of the retaining portion, so that the engagement at the retaining portion is prevented. Since the closing member prevents the closing member from escaping in the intersecting direction, the movement restricting means can be advantageously constructed in terms of structure and manufacturing cost.

According to a seventh aspect of the present invention, there is provided a characteristic feature of the branch pipe connecting method, in which the outer circumference of the fluid transport pipe is connected to the through holes formed in the upper pipe wall and the lower pipe wall of the fluid transport pipe. A flow path forming portion that forms a bypass flow path therebetween and a branch pipe portion that communicates with an upper portion of the bypass flow path and that forms a branch flow path that opens upward along the axial direction of both through holes. The provided branch pipe joint is fixed to the outer peripheral surface of the fluid transport pipe, and a perforator attached to the branch pipe portion of the branch pipe joint via an opening / closing valve does not interrupt the flow of fluid in the fluid transport pipe. After forming through holes in the upper pipe wall and the lower pipe wall of the fluid transport pipe through the opening / closing valve that has been opened and the branch pipe portion,
The on-off valve from which the punching machine was removed was fitted with an inserter equipped with a closing member configured to have a length that fits in the upper through hole and fits in the branch flow passage. The closing member is fitted into the upper through hole through the opening / closing valve that has been opened and the branching pipe portion, and the locked portion protruding from the outer peripheral surface of the closing member is provided on the inner peripheral surface of the branching pipe portion. To engage with the locking part that is protrudingly provided on the valve, and then remove the insertion machine from the on-off valve with the closing member engaged with the retaining lock left, and connect the fire hydrant or other piping to the on-off valve. It is at the point of connection.

According to the above characteristic structure, the branch pipe joint is fixed to the branch portion of the outer peripheral surface of the existing pipe, the perforator is attached to the branch pipe portion of the branch pipe joint through the opening / closing valve, and the inside of the fluid transport pipe is connected. A through hole is formed in the upper pipe wall and the lower pipe wall of the fluid transport pipe through the open / close valve and the branch pipe portion that are opened without blocking the flow of the fluid.

Next, an insertion machine having a closing member configured to have a length that fits in the upper through hole and is accommodated in the branch flow passage is attached to the opening / closing valve from which the punching machine is removed, The closing member mounted on the insertion machine is fitted into the upper through hole through the opened and closed on-off valve and the branch pipe portion.

Along with the fitting operation into the upper through hole, the locked portion projecting on the outer peripheral surface of the closing member is prevented from slipping off to the locking portion projecting on the inner peripheral surface of the branch pipe portion. Since they are engaged, no special working process for fixing the closing member is required, and the operation accuracy required for feeding the closing member is low.

After that, the insertion machine is removed from the opening / closing valve while leaving the closing member engaged with the retaining lock, and the fire hydrant or another pipe is connected to the opening / closing valve.

When the opening / closing valve is operated to open, the fluid flowing out from the lower through hole of the fluid transport pipe causes the bypass flow passage and the branch passage formed between the outer peripheral surface of the fluid transport pipe and the flow passage forming portion. Since it flows into the fire hydrant or another pipe through the branch flow passage and the on-off valve in the pipe portion, the deposits accumulated in the fluid transport pipe can be efficiently discharged to the outside.

Therefore, a sluice valve for work required when forming a through hole in the upper pipe wall and the lower pipe wall of the fluid transport pipe by using one on-off valve and when fitting and mounting the closing member. , And can also be used as an on-off valve for fire hydrants or other pipes, and moreover, since the closing member fitted to the upper through hole is configured to have a length that can be accommodated in the branch flow path,
The open / close valve is more compact than the conventional work sluice valve, and the branch pipe joint can be made lighter and easier to handle. Since no work process is required, it is possible to reduce the number of construction processes and labor.

Therefore, although the deposit accumulated in the fluid transport pipe can be efficiently discharged to the outside through the through hole of the lower pipe wall, the construction period can be shortened and the construction cost can be reduced as compared with the conventional method. The cost can be reduced.

The characteristic construction of the branch pipe connecting method according to claim 8 of the present invention is that when the closing member mounted on the insertion shaft is fitted into the upper through hole of the insertion machine, it is engaged with retaining. When the insertion shaft is pulled out from the closing member, there is provided a holding portion that comes into contact with the upper end of the closing member.

According to the above characteristic construction, not only can the closing member be fitted securely into the upper through hole of the fluid transport pipe, but also only the insertion shaft can be maintained while maintaining the closing member in the predetermined retaining engagement position. Can be pulled out quickly and easily.

[0036]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIGS.
A vertical direction (pipe diameter direction) that passes through the axis of the existing water pipe 1 on the upper pipe wall 1A and the lower pipe wall 1B of the existing water pipe 1 that is buried in the ground, which is an example of a fluid transport pipe (existing pipe). A ductile in which a divergence through-holes 1a and 1b of the same diameter are formed along the same axis along with the fire hydrant A, which is an example of equipment, is externally fixed to the on-off valve 2 and the existing water pipe 1 in a watertight state. 1 shows a branch pipe connection structure which is connected to both through holes 1a and 1b of an existing water pipe 1 through a cast iron branch pipe joint B.

As shown in FIGS. 1 and 2, the branch pipe joint B has a tubular joint body 3 which can be externally fixed to the outer peripheral surface of the existing water pipe 1 in a watertight state, by connecting the existing water pipe 1 to the outer pipe. A flow passage forming portion 5 that forms a bypass flow passage 4 between the outer peripheral surface of the existing water pipe 1 and a bypass flow passage that communicates with the through holes 1a and 1b formed in the upper pipe wall 1A and the lower pipe wall 1B. Both through holes 1a and 1b are communicated with the upper portion of the passage 4 and with respect to the upper through hole 1a.
And a branching pipe portion 7 having a branching flow passage 6 that opens upward in a state of communicating in a straight line from the axial direction of the above, and a circle fitted through the branching flow passage 6 into the upper through hole 1a. A columnar closing member 8 is provided.

The branch pipe joint B is an existing water pipe 1
A pair of upper and lower split pipe joint bodies B1, which are divided in two in the circumferential direction of
The split pipe joint bodies B1 and B2 are each provided with an elastic sealing material 9 that prevents leakage of tap water (an example of fluid) flowing out from both through holes 1a and 1b of the existing water pipe 1. At the same time, the connecting flanges 3a and 3b formed at both ends in the circumferential direction of the split pipe joint bodies B1 and B2 are connected to each other by the bolt 1
2. Fixedly connected via a fastener composed of 2 and nuts 13.

The closing member 8 is made of a hard synthetic rubber and has such a length that the fitting member 8 fits into the upper through hole 1a and is accommodated in the branch flow passage 6, and the closing member 8 is The upper end surface 8a is formed as an inclined surface along the flow direction of tap water at a position corresponding to the communication between the bypass flow path 4 and the branch flow path 6, and further, the inner peripheral surface of the branch pipe portion 7 and the closing member 8 are formed. A retaining portion 11 that engages with the through holes 1a and 1b from the axial direction when the closing member 8 is fitted in the upper through hole 1a is provided at a portion facing the outer peripheral surface.

The retaining portion 11 will be described in detail. As shown in FIGS. 1 to 4, in plan view, the inner peripheral surface of the branch pipe portion 7 and the flow passage forming portion 5 are horizontally opposed to each other. Almost U
A triangular convex locking portion 11A is integrally projectingly provided on the inner peripheral surface portion in the shape of a letter along the horizontal direction, and U of the branch pipe portion 7 of the outer peripheral surface of the closing member 8 is formed. The outer peripheral surface of the semicircular arc in a plan view facing the inner peripheral surface of the character is
Both through-holes 1a, 1 with respect to the locking surface 11a of the locking portion 11A
a triangular convex lower locked portion 11B having a stopper surface 11b that engages in the axial direction of b and an inclined surface 11c of the locking portion 11A that engages in the axial direction of both through holes 1a and 1b. Triangular convex upper locked part 1 with pressing surface 11d
1D and 1D are projected integrally, and further, the lower side locked portion 1
On the lower side surface of 1B, there is provided a cam surface 11e for smoothly moving over the closing member 8 along with the fitting movement to the upper through hole 1a side in a state of being in contact with the inclined surface 11c of the locking portion 11A. Has been formed.

The on-off valve 2 is constructed by connecting a bolt 12 and a nut 13 to a connecting flange 7a integrally formed at an upper end of a branch pipe 7 at a lower end of a valve case 2B having a ball-shaped valve body 2A therein. Is integrally formed with a connecting flange 2a that is fixedly connected in a watertight state via a fastener
The connection flange 1 of the fire hydrant A is attached to the upper end of the valve case 2B.
4, a connecting flange 16 of a punching machine C having a cylindrical cutter 15 for forming both through holes 1a and 1b of the existing water pipe 1, and an inserting machine D for fitting and mounting the closing member 8. The punch C for the flange 17 and other pipes
In the case of the inserter D, a connecting flange 2b is integrally formed which is selectively fixedly connected in a watertight state by a fastener composed of a bolt 12 and a nut 13 with an auxiliary mounting cylinder 18 interposed.

Next, the insertion machine D will be described in detail.
As shown in FIG. 3, a base frame 20 having a connecting flange 17 is provided with a screw shaft 22 having an operation handle 21 which is rotatable around a vertical axis, and a top member 23 screwed to the screw shaft 22. And a slide cylinder shaft 24 that moves integrally in the up-and-down direction together with the slide cylinder shaft 24 are mounted in parallel, and in the slide cylinder shaft 24, there is provided a mounting hole 8b formed at the center position of the closing member 8 and also serving as an air vent. An insertable shaft 25 that can be inserted is provided so as to be slidable within a certain range in the vertical direction via a key 29 and a key groove 30, and an inclination of a closing member 8 is provided at a lower end portion of the slide cylinder shaft 24. The pressing surface 2 in an inclined posture that abuts on the upper end surface 8a from above and below.
A metal holding portion 26 having 6a is attached.

The screw shaft portion 25b formed on the upper end of the insertion shaft 25 can be rotated by an artificial operation tool such as a spanner, and the insertion shaft 25 can be vertically guided along with the rotation operation. The rotation operating cylinder 28 for screwing is screwed, and the screw shaft portion 25a formed at the lower end portion of the insertion shaft 25.
A temporary fixing member 27 inserted from below into the mounting hole 8b of the closing member 8 is screwed into the.

At the lower end of the temporary fixing member 27, the outer diameter is slightly larger than the inner diameter of the mounting hole 8b of the closing member 8, and the insertion shaft 25 is rotated upward relative to the slide cylinder shaft 24. Accordingly, a flange portion 27a that can be forcibly pulled and moved upward in the mounting hole 8b of the closing member 8 is integrally formed, and the pressing portion 26 is formed at the center of the pressing portion 26. With the inclined pressing surface 26a abutting against the inclined upper end surface 8a of the closing member 8, the slide cylinder shaft 24
On the other hand, when the insertion shaft 25 is rotated upward, a storage space 26b is formed into which the temporary fixing member 27 that has been forcibly pulled and moved upward in the mounting hole 8b of the closing member 8 is transferred.

Further, the inclined pressing surface 26a of the pressing portion 26
A large number of non-slip corrugated grooves are formed on the inner surface of the holding member 26, and the outer diameter of the pressing portion 26 is the same as the outer diameter of the closing member 8.

Next, a fire hydrant A, which is an example of the equipment, is inserted into both the through holes 1a and 1b of the existing water pipe 1 through a branch pipe joint B which is externally fixed to the open / close valve 2 and the existing water pipe 1 in a watertight state. A branch pipe connection construction method for communicating connection will be described.

After excavating a work pit at the location where the fire hydrant A is installed to expose the existing water pipe 1 and cleaning the outer peripheral surface thereof, as shown in FIG. Both split pipe joint bodies B1 and B2 of the pipe joint B are exteriorly mounted on the outer peripheral surface of the existing water pipe 1 in a state where the branch flow path 6 of the branch pipe portion 7 opens upward, and fixedly connected with bolts 12 and nuts 13. To do.

The lower connecting flange 2a of the on-off valve 2 is attached to the connecting flange 7a of the branch pipe portion 7 of the branch pipe joint B by the bolt 1
2, while being fixedly connected in a watertight state via the nut 13, the connection flange 16 of the perforator C is fixedly connected to the upper connection flange 2b of the on-off valve 2 via the attachment auxiliary cylinder 18, and FIG. As shown in FIG. 3, after switching the open / close valve 2 to the open state, the cylindrical cutter 15 is driven and rotated to be fed along the passage in the open / close valve 2 and the branch pipe portion 7 of the branch pipe joint B. The through holes 1a and 1b are formed in the upper pipe wall 1A and the lower pipe wall 1B of the existing water pipe 1 without interrupting the flow of tap water in the existing water pipe 1.

When the processing of the through holes 1a and 1b is completed, the cylindrical cutter 15 is returned to the initial position and then the on-off valve 2 is switched to the closed state, and the punching machine is operated from the upper connecting flange 2b of the on-off valve 2. Remove C.

Next, as shown in FIGS. 5 (c) and 6, the attachment auxiliary cylinder 18 is attached to the upper connecting flange 2b of the on-off valve 2.
After the connection flange 17 of the inserter D is fixedly connected via the switch and the on-off valve 2 is switched to the open state,
As shown in (a), the operation handle 21 is rotated to the lower side, and the closing member 8 attached to the distal end portion of the insertion shaft 25 is connected to the passage in the on-off valve 2 and the branch pipe portion 7 of the branch pipe joint B. And the closing member 8 is sent along the
To fit.

Along with the fitting operation into the upper through hole 1a, the cam surface 11e of the lower engaged portion 11B protruding from the outer peripheral surface of the closing member 8, which is a constituent member of the retaining portion 11, is removed. ,
A stopper of the lower locked portion 11B is moved over the slanted surface 11c of the locking portion 11A provided on the inner peripheral surface of the branch pipe portion 7 as shown in a partially enlarged view of FIG. Surface 11b
And the locking surface 11a of the locking portion 11A are both through holes 1a and 1b.
And the closing member 8 is engaged with the branch pipe joint B so as not to be pulled out.

At this time, the pressing surface 11d of the upper locked portion 11D is elastically pressed against the inclined surface 11c of the locking portion 11A in the axial direction of the through holes 1a and 1b. The locking portion 11A on the branch pipe portion 7 side is closed by the closing member 8
The upper locked portion 11D and the lower locked portion 11B are sandwiched, and the closing member 8 is firmly retained and engaged.

Next, as shown in FIG. 7 (b), the inclined upper end surface 11a of the closing member 8 engaged and held by the retaining portion 11 is held.
In the state where the inclined pressing surface 26a of the pressing portion 26 attached to the slide cylinder shaft 24 is abutted to the rotation operation cylinder 28 to rotate the insertion shaft 25 upward,
Temporary fixing member 27 for the insertion shaft 25 that supports and retains
Is forced to move upward in the mounting hole 8b of the closing member 8 and then moved into the storage space 26b formed in the central portion of the holding portion 26, so that the closing member 8 penetrates the upper portion of the existing water pipe 1. It is left in a state of being fitted and engaged with the hole 1a and the locking portion 11A of the branch pipe joint B.

When the temporary fixing member 27 of the insertion shaft 25 is pulled out from the mounting hole 8b of the closing member 8, the operation handle 21 is rotated upward and downward to move the insertion shaft 25 and the slide cylinder shaft 24. After ascending to the initial position, the on-off valve 2 is operated to be closed, and the inserter D is removed from the upper connecting flange 2b of this on-off valve 2.

Next, as shown in FIG. 1, the connection flange 14 of the fire hydrant A is fixedly connected to the upper connection flange 2b of the on-off valve 2 through the bolt 12 and the nut 13.
When the opening / closing valve 2 is switched to the open state, the fluid flowing out from the lower through-hole 1b of the existing water pipe 1 flows into the fire hydrant A through the bypass flow passage 4 and the branch flow passage 6, and thus accumulates in the existing water pipe 1. The accumulated deposit can be efficiently discharged to the outside.

[Second Embodiment] In the branch pipe joint and the branch pipe connecting method shown in FIGS. 8 to 10, when the retaining portion 11 is engaged, the closing member 8 is arranged in the axial direction of the upper through hole 1a. A movement restricting means E for preventing escape movement in the intersecting direction is provided, and the movement restricting means E is provided on the outer peripheral surface of the closing member 8 in the vicinity of both ends of the lower locked portion 11B. The restricted protrusions 32, and both of the restriction protrusions 32 can be moved and guided along the axial direction of the upper through hole 1a, and
At the initial stage of engagement between the lower locked portion 11B on the closing member 8 side and the locking portion 11A on the branch pipe portion 7 side, the closing member 8 escapes in a direction intersecting the axial direction of the upper through hole 1a. The guide portion 33 is integrally formed on the inner peripheral surface of the branch pipe portion 7 in a state where the escape movement is prevented by contact with both the regulation protrusions 32 when the movement is attempted. .

Then, the locking portion 11 on the side of the branch pipe portion 7
Between both end portions of A and the facing surfaces of the guide portions 33, a passage is formed which allows both the restriction protrusions 32 to pass when the closing member 8 is fitted into the upper through hole 1a (descent). ing.

Further, as shown in FIG. 9, both the restriction projections 32 are composed of both projecting end portions of a locking pin which is fixed by penetrating the closing member 8 so as to bypass the mounting hole 8b in a U shape. ing. Since the other configurations are the same as the configurations described in the first embodiment, the same components will be denoted by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

[Third Embodiment] In the first embodiment described above, in constructing the retaining portion 11, the inner peripheral surface of the branch pipe portion 7 and the flow passage forming portion 5 are opposed to each other in the horizontal direction. A triangular convex locking portion 11A is integrally provided in the inner peripheral surface portion of the facing U-shape in a plan view along the horizontal direction, and a branch pipe is provided on the outer peripheral surface of the closing member 8. Part 7 U
A stopper surface that engages with the engaging surface 11a of the engaging portion 11A in the axial direction of both through holes 1a and 1b is provided on the outer peripheral surface portion that is substantially semi-circular in plan view and that opposes the character-shaped inner peripheral surface portion. 1
A triangular convex shape having a triangular convex lower engaged portion 11B provided with 1b and a pressing surface 11d engaging with the inclined surface 11c of the engaging portion 11A from the axial direction of both through holes 1a, 1b. The upper engaged portion 11D is integrally formed with the lower engaged portion 11B and the upper engaged portion 1D as shown in FIG.
1D is a portion of the outer peripheral surface of the closing member 8 for the fluid transport pipe 1
It may be carried out by allocating and arranging them on both sides in the axial direction of the tube.

In the case of this embodiment, at the initial stage of engagement between the lower locked portion 11B on the closing member 8 side and the locking portion 11A on the branching pipe portion 7 side, the closing member 8 makes the axis line of the upper through hole 1a. It is possible to suppress an attempt to escape and move in a direction intersecting the direction.

The rest of the configuration is the same as the configuration described in the first embodiment.
The same numbers as in the embodiment are added and the description thereof is omitted.

[Fourth Embodiment] FIGS. 12 and 13 show that the closing member 8 has the upper through hole 1a when the retaining portion 11 is engaged.
10 shows another embodiment of the movement restricting means E for preventing the escape movement in a direction intersecting the axial direction of the lower stopper 11b of the lower locked portion 11B from the lower end surface of the closing member 8. The height H1 from the inner peripheral surface side peripheral edge of the upper through hole 1a to the inclined surface 11a of the locking portion 11A is made larger than the height H2, and the upper portion is advanced before engaging the retaining portion 11. The extension fitting portion 8A fitted to the through hole 1a is formed by extension, and the extension fitting portion 8A constitutes the movement restricting means E.

Therefore, the extension fitting portion 8A formed on the closing member 8 is fitted into the upper through hole 1a prior to the engagement of the retaining portion 11 so that the engaging portion of the retaining portion 11 is engaged. Since the closing member 8 is prevented from escaping and moving in the intersecting direction in accordance with this, the movement restricting means E can be advantageously constructed in terms of structure and manufacturing cost. still,
Since other configurations are the same as the configurations described in the first embodiment, the same components will be denoted by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

[Fifth Embodiment] An improvement of the branch pipe joint and the branch pipe connecting method described in the third embodiment of Fig. 11 will be described.
The upper surface of the outer peripheral surface of the closing member 8 is in sliding contact with the inner peripheral surface of the branch pipe portion 7 and the inner peripheral surface portion of the U-shaped plan view which faces the flow path forming portion 5 in the horizontal direction. Alternatively, the falling prevention protrusions 35 that are close to each other are integrally formed to project along the horizontal direction.

Further, in this embodiment, the upper locked portion 11D described in the first embodiment is deleted. Since the other configurations are the same as the configurations described in the first embodiment, the same components will be denoted by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

[Other Embodiments] (1) In the above-described embodiment, the fire hydrant A, which is an example of a device, is fixedly connected to the upper connecting flange portion 2b of the opening / closing valve 2. A connection flange of another pipe may be fixedly connected to the portion 2b. (2) In the above-described embodiment, the retaining portion 11 includes the locking portion 11A protruding from the inner peripheral surface of the branch pipe portion 7 and the locked portion protruding from the outer peripheral surface of the closing member 8. 11B, but the invention is not limited to this structure, and the closing member 8
When it is fitted into the upper through hole 1a, any structure may be adopted as long as it can be engaged from the axial direction of the upper through hole 1a to prevent the removal movement of the closing member 8.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing a branch pipe connection structure according to a first embodiment of the present invention when a fire hydrant is attached.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an enlarged sectional view of the insertion machine.

FIG. 4 is a perspective view of a main part of an insertion machine immediately before being inserted into a branch pipe joint.

[FIG. 5] (a) Partial cross-sectional side view before drilling when a drilling machine is installed showing a branch pipe connection construction method (b) Partial cross-sectional side view after drilling when a drilling machine is installed (c) Partial cross-section when an inserting machine is installed Side view

FIG. 6 is an enlarged sectional side view of a main part when the insertion machine is attached.

[FIG. 7] (a) A cross-sectional side view of an essential part when the closing member mounted on the inserting machine is fitted into the upper through hole. (B) An essential part when pulling out the insertion shaft of the inserting machine from the closing member. Cross-sectional side view of (C) Cross-sectional side view of the main part when the insertion machine is returned to the initial position

FIG. 8 is a perspective view of a main part of an insertion machine showing a second embodiment of the present invention.

FIG. 9 is a horizontal sectional view of the main part of the branch pipe joint.

FIG. 10 (a) is a partial cross-sectional side view of the main part when the closing member mounted on the inserting machine is inserted into the opening of the branch pipe joint. (B) The closing member mounted on the inserting machine is arranged in the upper through hole. Partial cross-sectional side view of essential parts when mated

FIG. 11 is a horizontal cross-sectional view of the main parts of the branch pipe joint showing the third embodiment of the present invention.

FIG. 12 is a side view of a closing member showing a fourth embodiment of the present invention.

FIG. 13 is a partial cross-sectional side view of the main part when the closing member mounted on the insertion machine is fitted into the upper through hole.

FIG. 14 shows a fifth embodiment of the present invention, and is a partial cross-sectional side view of the main part when the closing member mounted on the insertion machine is fitted into the upper through hole.

FIG. 15 shows a conventional branch pipe connecting method, (A) Side view of a partial cross-section with the punch installed (B) is a partial cross-sectional side view when the inserter is installed (C) is a partial cross-sectional side view when the fire hydrant is installed

[Explanation of symbols]

A fire hydrant B Branch pipe fitting C punch D insertion machine 1 Fluid transport pipe 1A Upper pipe wall 1B Lower tube wall 1a Top through hole 1b Lower through hole 2 open / close valve 3 Joint body 4 Detour flow path 5 Flow path forming part 6 branch flow paths 7 Branch pipe 8 closing member 8a inclined upper surface 11 retaining section 11A locking part 11B Locked part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tsuyoshi Horikawa             1-3-2700, Umeda, Kita-ku, Osaka City, Osaka Prefecture             No. within the Water Technology Development Corporation F term (reference) 3H019 BA05 BB02 BC05 BD05 CA01                       CA06

Claims (8)

[Claims] 1. A joint body, which can be externally fitted and fixed to a fluid transport pipe, is provided between the fluid transport pipe and an outer peripheral surface of the fluid transport pipe in a state of communicating with through holes formed in an upper pipe wall and a lower pipe wall of the fluid transport pipe. A flow path forming portion that forms a bypass flow path and a branch pipe portion that communicates with an upper portion of the bypass flow path and that has a branch flow path that opens upward along the axial direction of the upper through hole are formed. With
A branch pipe joint provided with a closing member that fits into an upper through hole through the branch flow passage, wherein the closing member is configured to have a length that fits in the upper through hole and is accommodated in the branch flow passage. At the same time, when the closing member is fitted in the upper through-hole at the portion where the inner peripheral surface of the branch pipe portion and the outer peripheral surface of the closing member face each other, the closing member is engaged and closed from the axial direction of the upper through-hole. A branch pipe joint provided with a retaining portion that prevents the member from moving out. 2. The movement restricting means for preventing the closing member from escaping in a direction intersecting with the axial direction of the upper through hole when the retaining portion is engaged, is provided. Branch pipe joint. 3. The closing member is made of hard synthetic rubber, and the retaining portion projects from a locking portion projecting on the inner peripheral surface of the branch pipe portion and an outer peripheral surface of the closing member. Claim 1 or Claim 2 comprised from the locked part provided.
Branch pipe joint described. 4. The branch pipe according to claim 1, 2 or 3, wherein an upper end surface of the closing member is formed as an inclined surface along the flow direction of the fluid at a position corresponding to the communication between the bypass flow path and the branch flow path. Fittings. 5. The inner peripheral surface of the branch pipe portion in a state where the movement restricting means protrudes from the outer peripheral surface of the closing member and guides the restriction protrusion along the axial direction of the upper through hole. The branch pipe joint according to claim 2, comprising a guide portion provided on the surface. 6. The movement restricting means is composed of an extension fitting portion formed on the closing member in a state of being fitted into the upper through hole prior to engagement of the retaining portion. Branch pipe joint described. 7. A flow passage forming portion which forms a bypass flow passage between the fluid transport pipe and an outer peripheral surface of the fluid transport pipe in a state of being capable of communicating with through holes formed in an upper pipe wall and a lower pipe wall of the fluid transport pipe, A branch pipe joint, which is connected to the upper portion of the bypass passage and has a branch pipe portion that forms a branch flow passage that opens upward along the axial direction of both through holes, is provided on the outer peripheral surface of the fluid transport pipe. Through a perforator that is fixed and attached to the branch pipe part of this branch pipe joint via an on-off valve, through the inside of the open-close valve and the branch pipe part that are opened without interrupting the flow of the fluid in the fluid transport pipe. After forming through holes in the upper pipe wall and the lower pipe wall of the fluid transport pipe,
The on-off valve from which the punching machine was removed was fitted with an inserter equipped with a closing member configured to have a length that fits in the upper through hole and fits in the branch flow passage. The closing member is fitted into the upper through hole through the opening / closing valve that has been opened and the branching pipe portion, and the locked portion protruding from the outer peripheral surface of the closing member is provided on the inner peripheral surface of the branching pipe portion. To engage with the locking part that is protrudingly provided on the valve, and then remove the insertion machine from the on-off valve with the closing member engaged with the retaining lock left, and connect the fire hydrant or other piping to the on-off valve. Branch pipe connection method to connect. 8. The insertion machine includes a closing member attached to the insertion shaft when the closing member is fitted in the upper through hole and when the insertion shaft is pulled out from the closing member engaged with the retaining member. The branch pipe connection construction method according to claim 7, wherein a pressing portion that abuts on the upper end is provided.