JP4079477B2 - Branch pipe connection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a branch pipe joint having a branch pipe part for connecting a branch pipe is connected in communication with an existing pipe, a branch pipe is connected to the branch pipe part, and the branch pipe and the existing pipe are connected to each other. The present invention relates to a branch pipe connection method for performing a series of steps until communication is established via a branch pipe joint while preventing outflow of fluid in the existing pipe.
[0002]
[Prior art]
According to the first branch pipe connection method, a series of steps from connecting a branch pipe to the branch pipe section and communicating the branch pipe and the existing pipe via the branch pipe joint is performed. Since it is performed while preventing the outflow, when the existing pipe is a water pipe, the branch pipe can be connected without forcing the user to inconvenience such as water outage.
Then, in the conventional冒記branch pipe connecting method, for example, as described in JP-A-7-113489, the branch pipe joint is freely partition Ri valve opening and closing the branch pipe portion is provided, After connecting and connecting the existing pipe to the existing pipe while preventing the fluid from flowing in the existing pipe, and connecting the branch pipe joint to the existing pipe, the branch pipe is closed by the gate valve to prevent the fluid from flowing out. A branch pipe is connected to the gate valve.
[0003]
[Problems to be solved by the invention]
According to the prior art, it is necessary to use a branch pipe joint is provided with a branching pipe portion openable and closable partition Ri valve, there is a high stick drawback connection construction costs of the branch pipe.
The present invention has been made in view of the above circumstances, and an object thereof is to reduce the connection cost of the branch pipe by devising a connection method between the branch pipe section and the branch pipe. To do.
[0004]
[Means for Solving the Problems]
The branch pipe connection method according to claim 1 is:
The branch pipe is configured to be connected to the connection pipe section connected to the branch pipe section by a flange joint, and a connecting plate is sandwiched between the flanges of the flange joint to connect the connection pipe section to the branch pipe section side. To prevent the fluid from flowing out from the branching pipe part with its closing plate, and loosen the flange joint while the branch pipe is connected to the connecting pipe part. Pull out the closing plate so as to communicate, tighten the flange joint, and connect the connecting pipe part to the branching pipe part side.
Thus, the branch pipe and the branch pipe joint may be connected communication without intervention of the partition Ri valve therebetween, it is possible to reduce the connection cost of construction of the branch pipe.
[0005]
In addition, since the flow path forming member is fixed to the outer peripheral surface of the existing pipe and a through hole is formed in the pipe wall of the existing pipe through the branch pipe portion, the branch pipe joint itself prevents the outflow of fluid in the existing pipe. A through hole can be formed in the pipe wall of the existing pipe, also serving as a part of the working airtight case.
The branch pipe connection method according to claim 2 is:
The flange joint is formed on the connecting pipe part, the connecting pipe part side flange, the closing member side flange formed on the closing member provided with the closing part below, and the branching pipe part formed on the branching pipe part. This is a branch pipe connection method composed of side flanges.
The branch pipe connecting method according to claim 3 is:
In the branch pipe connecting method, the closing plate is sandwiched between the connecting pipe portion side flange and the closing member side flange.
The branch pipe connection method according to claim 4 is:
It is a branch pipe connecting method in which the closing member is formed with a cylindrical fitting portion that can be fitted into the branch pipe portion.
[0006]
The branch pipe connecting method according to claim 5 is:
In order to loosen the flange joint and pull out the closing plate, the tightening bolts between the flanges that sandwich the closing plate are regulated so that the allowance is within a certain range. It is possible to prevent a situation in which a large amount of fluid flows out from between.
[0007]
The branch pipe connecting method according to claim 6 is:
A tightening bolt is screwed into one of the flanges sandwiching the closing plate, and when the tightening bolt is loosened, a contact member that comes into contact with the flange side is provided on the tightening bolt. Is regulated so as to be within a certain range, the flange joint can be easily loosened within the certain range by a screwing operation on one flange of the tightening bolt.
[0008]
In partial branch pipes splicing technique, to one end of the closing plate, the engaged portion is formed to disengageably lock the withdrawal device for withdrawing from between the flanges to each other the closing plate, the closing plate If the configuration is such that the locked portion is sandwiched between the flanges , a locked portion is formed at one end of the closing plate, and the locked portion is between the flanges. When the pulling plate is sandwiched so that it protrudes and the pulling plate is pulled out, the pulling tool is locked to the locked part and pulled out. Compared to the case of sandwiching so as to protrude from between the flanges, the protruding portion between the flanges of the closing plate is less likely to interfere with the work.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 1 and 2 show that an existing water pipe A buried in the ground as an example of an existing pipe and a branch pipe B with a ball valve as an example of a branch pipe to which a fire hydrant C is connected are made of ductile cast iron. 1 shows a connection structure of branch pipes that are connected in communication via a branch pipe joint D, and the branch pipe joint D extends from the existing pipe lower portion formed between the outer peripheral surface of the existing water pipe A and the existing pipe upper portion. The existing water pipe through the spiral guide channel 2 along the circumferential direction of the existing pipe and the lower through-hole 1a formed in the lower pipe wall A1 of the existing water pipe A so as to communicate with the lower part of the guide channel 2 A and the branch pipe B are connected in communication.
[0010]
The branch pipe joint D is configured by integrally forming a branch pipe portion 4 for connecting a branch pipe to a cylindrical flow path forming member 3 fixed in a watertight manner to the outer peripheral surface of the existing water pipe A. The upper through-hole 1b for operation provided in the upper pipe wall A2 of the water pipe A is closed with a closing part 5 described later, and a guide flow path is formed between the outer peripheral surface of the existing water pipe A and the inner surface of the flow path forming member 3. 2 and the branch pipe part 4 is provided substantially vertically toward the existing water pipe radial direction so as to open at the upper part in the guide flow path 2.
[0011]
The said branch pipe B is comprised so that it may connect to the short pipe E as a connection pipe part connected with the pipe part 4 for a branch by the flange joint 6, and the tap water which flowed out from the lower through-hole 1a of the existing water pipe A is used. It is configured so that water can be discharged from the fire hydrant C via the branch pipe B connected to the short pipe E by being guided to the upper part in the circumferential direction along the outer peripheral surface of the existing water pipe A and flowing into the branch pipe section 4. .
[0012]
The flow path forming member 3 is formed in a cylindrical shape surrounding the outer peripheral surface of the existing water pipe A, and two upper and lower parts are fixed so that the outer peripheral surface of the existing water pipe A can be fixed to the existing water pipe A in a state of being sandwiched from the radial direction. The divided members 3a and 3b are divided into the divided members 3a and 3b, and the divided members 3a and 3b are bulged radially outward along the circumferential direction of the existing water pipe A so as to form the guide channel 2 inside thereof. A rubber packing material 3c is mounted between the divided members 3a and 3b and the existing water pipe A and between the divided members 3a and 3b.
Accordingly, the flow path forming member 3 is configured as a case forming member fixed so as to surround the outer peripheral surface of the existing water pipe A, and the branch pipe joint D connects the branch pipe portion 4 to the case forming member 3 in communication. Configured.
[0013]
A closing portion 5 that closes the upper through hole 1b at the lower end of a circular cylindrical body 7 (the closing member 7, specifically, a cylindrical fitting portion of the closing member 7) that is fitted into the branch pipe portion 4. There is integrally formed, in the center of the closing part 5, air vent hole 5a is made form.
The cylindrical body 7 includes an upper flange (branch pipe part side flange) 6a formed on the upper part of the branch pipe part 4 and a lower flange (connection pipe part side flange) 6b formed on the lower part of the short pipe E. A fixing flange (closing member side flange) 6c sandwiched between and fixed in a co-tightened state and an opening 7a communicating with the guide channel 2 are formed.
[0014]
Then, the cylindrical body 7 with the opening 7a facing the guide channel 2 is sandwiched and fixed between the upper flange 6a and the lower flange 6b by the fixing flange 6c, so that the closing portion 5 is peripheral to the upper through-hole. In the state where a gap f is formed between the upper through hole 1b and the upper through hole 1b, the upper through hole 1b is closed.
[0015]
Next, the branch pipe joint D is fixed to the existing water pipe A buried in the ground, and the branch pipe B is connected to the branch pipe portion 4 through the short pipe E. The series of processes until the water pipe A is communicated with the branch pipe joint D is prevented from flowing out of the tap water from the branch pipe joint D without interrupting the flow of tap water in the existing water pipe A. The branch pipe connecting method that is performed will be described with reference to FIGS.
[0016]
After excavating a pit at the place where the fire hydrant C is installed to expose the existing water pipe A and cleaning the outer peripheral surface thereof, the divided members 3a and 3b fitted with the packing material 3c are connected to the outer peripheral surface in a watertight manner. fixed to the guide passage 2 is formed between the inner surface and the existing water pipe a peripheral surface of the flow path forming member 3, as shown in FIG. 12, the gate valve G for work branching pipe portion 4 At the same time, the first sealed case J for work in which the cylindrical cutter H1 of the punching machine H is set inside is fixed to the gate valve G.
A water stop bolt K having a guide pin K1 for positioning the cylindrical body 7 is screwed into the bolt hole of the upper flange 6a of the branch pipe portion 4.
[0017]
Next, as shown in FIG. 13, the gate valve G is opened, the cutter H1 is inserted into the guide channel 2 through the branching pipe part 4, and the lower through-hole 1a is formed in the lower pipe wall A1 of the existing water pipe A. The upper through-hole 1b for work to be formed is provided with an upper tube wall A2 with the cutter H1, and the cutter H1 holding the section b of the upper through-hole 1b is lifted above the gate valve G, and then the gate valve G is closed, the section a is removed from the cutter H1, and then, as shown in FIG. 14, the lower pipe wall A1 of the existing water pipe A with the cutter H1 that has entered the existing water pipe A through the upper through hole 1b. The lower through-hole 1a is formed in the upper part, and the cutter H1 holding the section a is lifted to the upper part of the gate valve G, then the gate valve G is closed, and the perforator H is removed from the gate valve G together with the first sealed case J. To do.
[0018]
Next, as shown in FIG. 15, the second closed casing L that is set to a short pipe E and the cylindrical body 7 inside which is connected to the operating shaft member L1 for elevating the partition Riben G fixed To do.
As shown in FIG. 3, a cylindrical body 7 is bolted to a lower flange 6b of a short pipe E set inside the second sealed case L in advance with a fixing flange 6c, and fixed to the lower flange 6b. The flange 6c is a fastening clamp that is fitted between two flanges 6b, 6c so that the branch plate 4 is closed between the flanges 6b and 6c so as to be able to be pulled out in the radial direction, and is mounted at two locations facing each other in the flange radial direction. It is temporarily fixed with bolts and nuts 9.
[0019]
As shown in FIG. 4, at one end of the closing plate 8, a pulling tool 10 for pulling out the closing plate 8 from between the lower flange 6b and the fixing flange 6c is detachably locked. Two locking holes 8a are formed as locking portions, and the tightening bolts and nuts 9 are clamped by sandwiching the closing plate 8 so that the locking holes 8a protrude from between the flanges 6b and 6c. .
[0020]
6 and 7 show the work procedure when the lower flange 6b and the fixing flange 6c are closed and fixed with the fixing bolts and nuts 9 with the fixing plate 8 interposed therebetween, and a groove into which the tip of the screwdriver is inserted is shown. As shown in FIG. 6, the headed bolt 9a as a fastening bolt having the formed flat head 9c is screwed into the fixing flange 6c until the flat head 9c contacts the lower surface of the fixing flange 6c. As shown in FIG. 7, the head bolt 9a is turned to a side loosened by a predetermined amount, for example, a half turn to form a gap m between the flat head 9c and the lower surface of the fixing flange 6c. Then, a nut 9b is screwed into the projecting end of the head bolt 9a from the lower flange 6b, and the lower flange 6b and the fixing flange 6c are tightened to form the lower flange 6b and the fixing flange 6c. Fixed across the closing plate 8, and head bolt 9a and a nut 9b in its fixed state are welded together so as to rotate integrally.
[0021]
Accordingly, the headed bolt 9a is screwed to the fixing flange 6c, which is one of the flanges 6b and 6c sandwiching the closing plate 8, and the headed bolt 9a is connected to the headed bolt 9a. A flat head 9c is provided as a contact member that comes into contact with the flange 9c when the nut 9b is loosened, and the loosening allowance for pulling out the closing plate 8 of the headed bolt 9a is regulated within a certain range. ing.
[0022]
Next, as shown in FIG. 16, until the gate valve G is opened and the operation shaft member L1 is operated, the fixing flange 6c of the cylindrical body 7 contacts the upper flange 6a of the branch pipe portion 4. After the short pipe E and the cylindrical body 7 are lowered through the branch pipe portion 4 and positioned by inserting the guide pins K1 of the water stop bolt K into the four connecting bolt holes 6d of the fixing flange 6c, While removing the water stop bolt K, as shown in FIG. 17, the connecting bolt 11 inserted in place of the water stop bolt K is screwed into the fixing flange 6c, and the short pipe E is connected to the branch pipe portion 4 side. Are connected by a flange joint 6.
Therefore, in this state, as shown in FIG. 5, the blocking portion 5 inserted through the branching tube portion 4 enters the upper through hole 1b, and the upper through hole 1b is blocked, and the branching tube portion Outflow of tap water from 4 is blocked by a blocking plate 8.
[0023]
Next, the connection with the gate valve G of the second sealed case L is released, the second sealed case L is lifted along the operation shaft member L1, and the connection between the operation shaft member 1 and the short pipe E is released. Then, the second sealed case L is removed from the gate valve G, and the gate valve G is further removed from the branch pipe portion 4, and the branch pipe B is connected to the short pipe E as shown in FIG. Connect a fire hydrant C to the branch pipe B.
[0024]
Next, as shown in FIG. 8, the head bolt 9a that fixes the lower flange 6b and the fixing flange 6c with the plate 8 sandwiched therebetween is tightened until the flat head 9c contacts the lower surface of the fixing flange 6c. The flange joint 6 is loosened by turning from the 9b side, and a pulling tool 10 made of a steel plate is locked to the closing plate 8 and the closing plate 8 is pulled out as shown in FIG.
[0025]
As shown in FIG. 10, the pulling tool 10 includes a locking projection 10a and a handle portion 10b that are locked in the locking hole 8a of the closing plate 8, and the locking projection 10a is locked in the locking hole 8a. In this state, the closing plate 8 is easily pulled out by grasping the handle portion 10b and pulling it in the radial direction of the flange.
[0026]
Next, as shown in FIG. 11, the head bolt 9a is tightened with a nut 9b to fix the lower flange 6b and the fixing flange 6c, and then, as shown in FIG. 1, the nut 11a of the connecting bolt 11 is The upper flange 6a, the lower flange 6b, and the fixing flange 6c constituting the flange joint 6 are fixed by being screwed together, and the series of steps is completed.
[0027]
[Other Examples]
1. The branch pipe connection method according to the present invention is not limited to connecting a branch pipe to an existing water pipe, and for example, a branch pipe may be connected to an existing sewer pipe.
2. A flange joint that directly connects the branch pipe portion and the connection pipe portion may be provided, and a closing plate may be sandwiched between the flanges of the flange joint so that they can be pulled out.
3. A nut is screwed into a tightening bolt that is inserted over both flanges, and a closing plate is sandwiched between the flanges, and a restricting member that restricts the screw advance range of the nut against the tightening bolt is provided. Thus, the tightening bolt loosening allowance may be regulated within a certain range.
4). A closing plate to which a drawing tool is fixed in advance may be sandwiched between the flanges so as to be pulled out.
5 This is a branch pipe connection method in which a fixed length of an existing pipe is cut out in a sealed case for work surrounding the existing pipe, a branch pipe joint is connected to the cut portion, and the branch pipe joint and the existing pipe are connected in communication. May be.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional front view showing a branch pipe connection structure. FIG. 2 is a partial cross-sectional side view showing a branch pipe connection structure. FIG. 3 shows a temporarily fixed state between a short pipe and a cylindrical body. Sectional sectional side view [FIG. 4] Plan view of the main part [FIG. 5] Cross section of the main part [FIG. 6] Cross section of the main part [FIG. 7] Cross section of the main part [FIG. 9 is a cross-sectional view of the main part. FIG. 10 is a perspective view of the main part. FIG. 11 is a cross-sectional view of the main part. FIG. 12 is an explanatory view of the branch pipe connection method. 14] Illustration of branch pipe connection method [FIG. 15] Illustration of branch pipe connection method [FIG. 16] Illustration of branch pipe connection method [FIG. 17] Illustration of branch pipe connection method [FIG. 18] Branch pipe connection method Explanation drawing [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a Lower through-hole 3 Case formation member 4 Branching pipe part 6 Flange joint 6b, 6c Flange 8 Closing board 8a Locking part 9a Clamping bolt 9c Contacting member 10 Extraction tool A Existing pipe A1 Pipe wall B Branch pipe B
D Branch fitting E Connection pipe

Claims (6)

A branch pipe section for connecting a branch pipe is connected to the flow path forming member that forms a guide flow path along the existing pipe circumferential direction from the existing pipe lower portion to the existing pipe upper portion with the outer peripheral surface of the existing pipe. Fixing the branch pipe joint provided toward the existing pipe radial direction so as to open at the upper part in the road to the outer peripheral surface of the existing pipe,
An upper through hole for forming a lower through hole communicating with the lower part in the guide channel is provided in the upper pipe wall of the existing pipe through the branching pipe part,
The upper through-hole after forming the lower through-hole is closed through the branch pipe portion,
A series of steps from connecting a branch pipe to the branch pipe section and communicating the branch pipe and the existing pipe through the guide flow path and the lower through-hole is performed by a fluid from the branch pipe joint. Branch pipe connection method while preventing the outflow of
The branch pipe is configured to be connected to a connection pipe portion connected by a flange joint to the branch pipe portion side,
After attaching a gate valve for preventing the fluid from flowing out from the branch pipe part to the branch pipe joint, the upper through hole is provided in the existing pipe,
In the flange joint, a closing portion that closes the upper through-hole is formed so as to be insertable through the branching pipe portion, and a closing plate that closes the branching pipe portion is sandwiched between the flanges, After connecting the connecting pipe part to the branch pipe part side while closing the upper through hole, the partition valve is removed from the branch pipe joint,
Next, in a state where the branch pipe is connected to the connection pipe portion, loosen the flange joint, pull out the closing plate,
Next, a branch pipe connection method for tightening the flange joint and connecting the connection pipe portion to the branch pipe portion side.   The flange joint includes a connecting pipe portion side flange formed on the connecting pipe portion, a closing member side flange formed on a closing member provided with the closing portion below, and a branch pipe portion formed on the branch pipe portion. The branch pipe connecting method according to claim 1, comprising a side flange.   The branch pipe connecting method according to claim 2, wherein the closing plate is sandwiched between the connecting pipe portion side flange and the closing member side flange.   The branch pipe connecting method according to claim 2 or 3, wherein the plugging member is formed with a cylindrical fitting portion that can be fitted into the branch pipe portion.   The branch pipe connection method according to any one of claims 1 to 4, wherein a loosening margin of a fastening bolt between flanges sandwiching the closing plate is regulated to be within a certain range. The fastening bolt is screwed to one of the flanges sandwiching the closing plate;
6. The branch pipe connection according to claim 5, wherein a contact member that contacts the flange side as the tightening bolt is loosened is provided on the tightening bolt, and the loosening allowance is regulated within a certain range. Construction method.

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