JP5266174B2 - T-pipe replacement method for water pipes and new T-tube connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To practice the restoration work of a water leakage trouble advantageously at cost and schedule of its construction by taking advantage of a valve room provided at a given position in the water piping system, even under a condition in which the vicinity containing the water leakage site of a buried water pipe cannot be excavated. <P>SOLUTION: A T-pipe replacing method includes operation processes of: forming, in an upper portion of the valve room built in the surrounding area of an existing T-pipe P with a diameter for enabling persons to work therein, a working opening through which the removal of the existing T-pipe and the installation of a T-pipe to be newly-installed are possible; removing the existing T-pipe coupled between both adjacent buried water pipes inside the valve room; bringing in the T-pipe A to be newly-installed, which includes a protruded pipe section with a diameter for enabling persons to work therein, through the working opening between both the adjacent buried water pipes P; coupling the T-pipe A to be newly installed between both the buried water pipes, and coupling both the ends of the T-pipe A to be newly-installed and ends of both the buried water pipes P, water-tightly together. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a T-tube replacement method effective for countermeasures against a water leakage accident in a large-diameter buried water pipe that can be operated by a human in a water pipe system, and a connection structure for a new T-shaped pipe used therefor.

  As a recovery method when a water leakage accident occurs in a large-diameter buried water pipe in a water pipe system, a work pit is generally constructed by excavating the ground at the location where the water leak has occurred, and the buried work is exposed in this work pit. A construction method is adopted in which a water stop cover that surrounds the water leakage pipe portion in a watertight state is attached to the water pipe.

If it is not possible to directly excavate the ground at the location where the water leak occurred, excavate the ground slightly away from the location where the water leak occurred along the water pipe system to build a work pit, which is exposed in this work pit. A part of a buried water pipe is cut into a ring shape with a width that allows humans to enter and exit, and the rubber ring-shaped sealing material applied to the inner peripheral surface of the water leaking part of the water pipe is expanded from this cut point. The water leakage portion of the water pipe is sealed from the inside of the pipe in a water-stopped state by crimping with a crimpable band that can be operated in diameter (see, for example, Patent Documents 1 and 2).
After repairing the leaked portion of the water pipe, a construction method has been proposed in which the cut ends of the cut section of the buried water pipe are connected with a joint ring.

Japanese Utility Model Publication No. 60-65497 Japanese Utility Model Publication No.59-153793

  However, even in the latter method, when other pipes such as gas pipes are congested in the vicinity of the buried water pipe including the leak occurrence location, or near the public road or river etc. In this case, the construction of the work pit requires a high level of excavation technology and a long construction period, and there is a disadvantage that the effect of the water stoppage becomes large and the construction itself becomes large.

  The present invention has been made in view of the above-mentioned actual situation, and the main problem is that a leak chamber of a buried water pipe is included by using a valve chamber provided in a predetermined place of the water pipe system. Providing a T-pipe replacement method for water pipe systems and a new T-tube connection structure that can advantageously recover from a water leakage accident in terms of construction period and cost even under conditions where excavation is not possible It is in.

According to the first characteristic configuration of the present invention, an existing T-shaped tube with an air valve connected to a midway of a calibered water pipe capable of being operated by a person in a pipe is provided with a protruding pipe part having a caliber capable of entering and exiting a person. It is a T-pipe replacement method for water pipes that replaces the new T-pipe with
An opening forming step for forming an opening for operation in which an existing T-shaped tube can be removed and a new T-shaped tube can be carried in an upper portion of a valve chamber constructed around the existing T-shaped tube;
An existing T-shaped pipe removing step for removing an existing T-shaped pipe connected to an end of one buried water pipe and an end of the other buried water pipe in the valve chamber;
An arrangement step of arranging the new T-shaped pipe carried through the working opening between the end faces of both buried water pipes;
A connecting step of connecting one end of the new T-shaped pipe and an end of one buried water pipe, and connecting the other end of the new T-shaped pipe and an end of the other buried water pipe;
A first watertight connection step of connecting one end of the new T-shaped pipe and one end of one buried water pipe in a watertight state;
A second watertight connection step of connecting the other end of the new T-shaped tube and the end of the other buried water pipe in a watertight state;
Is in the point that is provided.

  According to the above configuration, when a water leakage accident occurs in a large-diameter buried pipe in a water pipe system, for example, other pipes such as gas pipes in the vicinity of the buried water pipe including the leakage occurrence point. Even if the area is congested or the vicinity including the location of water leakage is located directly under public roads or rivers, etc., it is provided in the water pipe system to install a T-tube with an air valve. Among the valve chambers, a working opening is formed in the upper portion of the valve chamber in the valve chamber closest to the location of the water leakage accident.

  Usually, a manhole is provided in the upper part of the valve chamber, but it is not suitable for removing an existing T-tube and carrying in a new T-tube, and the valve chamber itself is narrow, so By forming the opening for use, the work space becomes large, and the removal of the existing T-shaped tube and the loading of the new T-shaped tube can be performed efficiently and easily.

  After connecting both ends of the new T-tube and the ends of both buried water pipes, the both ends of the new T-tube and the ends of both buried water pipes are connected in a watertight state. Even if a situation occurs in which the lower space between the lower part of the new T-tube and the bottom surface of the valve chamber is narrow and the connection work on the side facing this lower space cannot be sufficiently performed, In order to carry in the water leakage repair equipment, it can enter the new T-shaped tube through the projecting tube formed in the new T-shaped tube and perform water-tight treatment from the inside. The end of the buried water pipe can be securely connected in a watertight state.

  Therefore, using a valve chamber provided at a predetermined location in the water pipe system, a T-tube with an air valve in the valve chamber is replaced with a new T-shape having a protruding tube portion with a diameter that allows people to enter and exit. By replacing it with a pipe, even if it is not possible to excavate the vicinity of the buried water pipe, including the location where the water leak occurred, the work to recover from the water leakage accident can be carried out advantageously in terms of construction period and cost, and the adverse effects of water breakage can be reduced. It can be suppressed in a short time.

  In particular, the replacement work between the existing T-shaped pipe with an air valve connected in the middle of the buried water pipe and the new T-shaped pipe with a projecting pipe having a diameter that allows people to enter and exit has been completed in advance. Then, for example, it is only necessary to remove the air valve connected to the projecting pipe portion of the new T-shaped tube, and it is possible to quickly recover from a water leakage accident that has occurred in the buried pipe.

According to a second characteristic configuration of the present invention, an existing T-shaped tube with an air valve connected to a midway of a calibered water pipe that can be operated by a person in a pipe is provided with a protruding pipe part having a caliber that allows a person to enter and exit. It is a T-pipe replacement method for water pipes that replaces the new T-pipe with
An opening forming step for forming an opening for operation in which an existing T-shaped tube can be removed and a new T-shaped tube can be carried in an upper portion of a valve chamber constructed around the existing T-shaped tube;
An existing T-shaped tube removal step of cutting and removing the existing T-shaped tube that is fitted and connected to the receiving pipe portion of one buried water pipe and the insertion tube portion of the other buried water pipe in the valve chamber;
A dimension adjustment process between end faces, in which the insertion tube portion of the buried water pipe is cut and dimensioned so that the new T-shaped pipe can be inserted between the end faces of the both buried water pipes,
An insertion tube portion that can be internally fitted and connected to the receiving tube portion of the one buried water pipe from the tube axis direction, and an outer fitting from the tube axis direction to the insertion tube portion of the other buried water pipe Arrangement step of placing the new T-shaped pipe having a connectable movable connecting pipe between the end faces of both buried water pipes carried from the working opening,
A connecting step of internally fitting and connecting the insertion tube portion of the new T-shaped tube to the receiving tube portion of the buried water pipe, and extending and fitting the movable connecting tube to the insertion tube portion of the buried water pipe ,
A first watertight connection step of connecting the insertion tube portion of the new T-shaped tube and the reception tube portion of the buried water pipe in a watertight state;
A second watertight connection step of connecting the movable connection pipe of the new T-shaped pipe and the insertion pipe portion of the buried water pipe in a watertight state;
Is in the point that is provided.

  According to the above configuration, in the restoration work when a water leakage accident occurs in a large-diameter buried pipe in the water pipe system, for example, other pipes such as gas pipes are located in the vicinity of the buried water pipe including the leak occurrence location. Even if it is congested or the vicinity including the location of water leakage is located directly under public roads, rivers, etc., it is provided in the water pipe system to install a T-tube with an air valve. In the valve chamber that is closest to the location of the water leakage accident, a working opening is formed in the upper portion of the valve chamber.

  Usually, a manhole is provided in the upper part of the valve chamber, but it is not suitable for removing an existing T-tube and carrying in a new T-tube, and the valve chamber itself is narrow, so By forming the opening for use, the work space becomes large, and the removal of the existing T-shaped tube and the loading of the new T-shaped tube can be performed efficiently and easily.

  The existing T-shaped pipe is fitted and connected to the receiving pipe part of one buried water pipe and the insertion pipe part of the other buried water pipe, but by cutting and separating this existing T-shaped pipe, The fitting connection state on both sides in the tube axis direction can be released and easily removed.

  Since the new T-shaped pipe is provided with a projecting pipe portion having a diameter that allows people to enter and exit, the total length of the new T-shaped pipe is longer than the existing T-shaped pipe, and is between the end faces of the two buried water pipes. It is necessary to adjust the dimensions to insert the new T-tube, but at this time, the straight tubular insertion tube portion in the other buried water pipe having a simple shape is cut, so that finishing processing after cutting is easy. It can be carried out.

  The insertion tube portion of the new T-shaped tube is internally connected to the receiving tube portion of one buried water pipe from the tube axis direction, and the movable connection tube of the new T-shaped tube is extended and embedded. After external fitting and connection to the inlet pipe part of the water pipe, the insertion pipe part of the new T-shaped pipe and the receiving pipe part of the buried water pipe, and the insertion of the movable connecting pipe of the new T-shaped pipe and the buried water pipe The mouth pipes are connected to each other in a watertight state. At this time, the lower space between the lower side of the new T-tube and the bottom surface of the valve chamber is narrow, and the connection work on the side facing this lower space is sufficient. Even if a situation that cannot be carried out occurs, in order to carry the water leakage repair equipment to the location where the water leakage occurred in the buried water pipe, it enters the new T-shaped pipe through the protruding pipe formed in the new T-shaped pipe, Because it can be treated, both ends of the new T-tube and the ends of both buried water pipes are securely in a watertight state. It can be connected.

  Therefore, by using a valve chamber provided at a predetermined location in the water pipe system, an existing T-shaped tube with an air valve in the valve chamber is replaced with a new T-tube having a diameter that allows a person to enter and exit. By replacing it with a pipe, even if it is not possible to excavate the vicinity of the buried water pipe including the location where the water leak occurred, the recovery work for the water leakage accident can be carried out advantageously in terms of construction period and cost, and the adverse effects of the water break Can be suppressed in a short time.

  According to the third characteristic configuration of the present invention, in the T-pipe replacement method of the water pipe system having the above-described first or second characteristic configuration, after the first watertight connection step and the second watertight connection step, A concrete placing step is provided in which at least a lower half side portion of the new T-shaped tube is buried with protective concrete.

  According to the above configuration, the lower space between the lower side of the new T-tube and the bottom surface of the valve chamber is narrow, and the connection between the new T-tube and both buried water pipes on the side facing this lower space is sufficient. Even if it cannot be performed, the connection between the new T-shaped pipe and the two buried water pipes can be firmly constructed by embedding and fixing at least the lower half side portion of the new T-shaped pipe with the placed protective concrete.

  According to a fourth characteristic configuration of the present invention, in the T-pipe replacement method for a water pipe system including any one of the first to third characteristic configurations described above, the first watertight connection step includes the newly installed T A first outer connecting means for connecting the pipe and one buried water pipe in a watertight state on the outer peripheral surface side, and can be carried into the new T-shaped pipe through the opening of the projecting pipe portion, and This is a watertight connection process using a first pipe joint that connects the buried water pipe with the first pipe inner joint on the inner peripheral surface side in a watertight state.

  According to the said structure, a new T-shaped pipe and one underground water pipe are connected in a watertight state from both the pipe outer peripheral surface side and the pipe inner peripheral surface side by the first outer connecting means and the first pipe joint. As a result, there is a situation where the lower space between the lower side of the new T-tube and the bottom surface of the valve chamber is narrow, and the connecting operation by the first outer connecting means on the side facing this lower space cannot be performed sufficiently. In addition, the new T-shaped pipe and the one buried water pipe can be reliably connected in a watertight state on the inner peripheral surface side by the first pipe joint.

  According to a fifth characteristic configuration of the present invention, in the T-pipe replacement method for a water pipe system including any one of the first to fourth characteristic configurations described above, the second watertight connection step includes the new T A second outer connecting means for connecting the pipe and the other buried water pipe in a watertight state on the outer peripheral surface side, and can be carried into the new T-shaped pipe through the opening of the projecting pipe, and the new T-shaped pipe and the other This is a water-tight connection step using a second pipe inner joint that connects the buried water pipe in a water-tight state on the inner peripheral surface side.

  According to the above configuration, the new T-shaped pipe and the other buried water pipe are connected in a watertight state from both the pipe outer peripheral surface side and the pipe inner peripheral surface side by the second outer connecting means and the second pipe joint. As a result, there is a situation where the lower space between the lower side of the new T-tube and the bottom surface of the valve chamber is narrow, and the connecting operation by the second outer connecting means on the side facing this lower space cannot be performed sufficiently. In addition, the new T-shaped pipe and the other buried water pipe can be reliably connected in a watertight state on the inner peripheral surface side by the second pipe joint.

  According to a sixth characteristic configuration of the present invention, in the water pipe system T-shaped tube replacement method having the second characteristic configuration described above, the new T-shaped tube includes the protruding tube portion, the inlet tube portion, and the insertion tube portion. A T-shaped main pipe integrally formed with the mouth pipe section and a fixed connection pipe section projecting toward the movable connection pipe in a concentric state; and A movable connecting pipe, and after the movable connecting pipe is externally connected to the inlet pipe part of the buried water pipe, the fixed connecting pipe part of the T-shaped main pipe and the movable connecting pipe are in a watertight state. The third watertight connection step is to provide a connection.

  According to the above configuration, since the movable connecting tube is fitted and held with respect to the fixed connecting tube portion of the T-shaped main tube, the fixed connecting tube portion of the T-shaped main tube and the movable connecting tube are connected in a watertight state. In this case, the lower space between the lower side of the movable connecting pipe of the new T-tube and the bottom surface of the valve chamber is narrow, and the fixed connecting pipe and the movable connecting pipe of the T-shaped main pipe on the side facing this lower space Even if a situation where the connecting operation cannot be performed sufficiently occurs, the fitting portion between the fixed connecting pipe portion of the T-shaped main pipe and the movable connecting pipe can be reliably connected from the inner peripheral surface side in a watertight state.

  A seventh characteristic configuration according to the present invention is a connection structure of a new T-shaped tube, and is in the middle of a buried water pipe having a caliber capable of being operated in a pipe by a person, and in the direction of the pipe axis at intervals in the valve chamber. The tube axis direction of the newly installed T-shaped tube with a protruding tube portion with a diameter that allows humans to enter and exit from the receiving tube portion of one buried water pipe among the receiving tube portion and the insertion tube portion facing each other The insertion tube section on one end side is fitted and connected, and the movable connection pipe that can be expanded and contracted provided on the other end side in the tube axis direction of the new T-shaped tube is connected to the insertion tube section of the other buried water pipe. A first outer connecting means for connecting the insertion tube portion of the new T-shaped tube and the receiving tube portion of the buried water pipe on the outer peripheral surface side, and carrying into the new T-shaped tube through the protruding tube portion. A first in-pipe joint capable of connecting the insertion tube portion of the new T-shaped tube and the receiving tube portion of the buried water pipe in a watertight state on the inner peripheral surface side A second outer connecting means for connecting the movable connecting pipe of the new T-shaped pipe and the insertion pipe section of the buried water pipe on the outer peripheral surface side, and can be carried into the new T-shaped pipe through the protruding pipe section; and There is a second pipe joint that connects the movable connection pipe of the new T-shaped pipe and the insertion pipe section of the buried water pipe in a watertight state on the inner peripheral surface side.

  According to the above configuration, the insertion tube portion on one end side in the tube axis direction of the new T-shaped tube is fitted and connected to the receiving tube portion of the one buried water pipe facing the valve chamber, and the new T-shape is connected. A movable connecting pipe provided on the other end side of the pipe in the axial direction of the pipe is moved to the extension side and externally connected to the inlet pipe portion of the other buried water pipe facing the valve chamber. Through the opening of the projecting pipe part of the new T-shaped pipe installed using the valve chamber provided, the worker can move smoothly to the location of the water leakage accident in the buried water pipe, and the leaked water repair equipment that was carried in Can reliably repair the location of the water leakage accident in the buried water pipe.

  Therefore, at the time of recovery work when a water leakage accident occurs in a large-diameter buried pipe in a water pipe system, for example, other pipes such as gas pipes are congested in the vicinity of the buried water pipe including the location where the water leak occurred. Even if the vicinity including the location where the water leak occurred is located directly under the public road or river, the location where the water leakage accident occurred is the most common in the valve chambers provided in the water pipe system. The restoration work can be quickly started using the protruding tube portion of the new T-shaped tube installed in the nearby valve chamber.

  In addition, the first outer connecting means and the first in-pipe joint connect the insertion tube portion of the new T-shaped tube and the receiving tube portion of one of the buried water pipes on both the pipe outer peripheral surface side and the pipe inner peripheral surface side. In addition, the second outer connecting means and the second inner joint allow the movable connecting pipe of the new T-shaped pipe and the inlet pipe portion of the other buried water pipe to be connected to the outer peripheral surface of the pipe. Since the lower space between the lower side of the new T-shaped tube and the bottom surface of the valve chamber is narrow, the first outer side on the side facing this lower space Even when the connecting work by the connecting means and the second outer connecting means cannot be performed sufficiently, the first T-joint and the second T-joint ensure that the new T-shaped pipe and both buried water pipes are in a watertight state on the inner peripheral surface side. Can be linked.

  Therefore, using the valve chamber provided at a predetermined location of the water pipe system, the receiving pipe portion and the inlet pipe portion of the buried water pipe facing the valve chamber are projected pipe portions having a diameter that allows humans to enter and exit. By connecting with a new T-shaped pipe equipped with a water leakage accident recovery work can be advantageously carried out in terms of construction period and cost even under conditions where excavation is not possible in the vicinity of the buried water pipe, including the location where water leakage has occurred. , The adverse effects of water outages can be suppressed in a short time.

  According to an eighth characteristic configuration of the present invention, in the connection structure of the new T-shaped tube having the seventh characteristic configuration described above, both the insertion tube portion of the new T-shaped tube and the reception tube portion of the buried water pipe are provided. A first engaging means for preventing the movement of the first inner joint in the tube axis direction is provided at a portion where the inner peripheral surface and the first inner pipe joint face each other. Engage the movement of the second inner joint in the direction of the axis of the pipe in the opposite parts of the inner peripheral surface of the movable connecting pipe of the character pipe and the inlet pipe portion of the buried water pipe and the second inner pipe joint. The second engaging means for blocking is provided.

  According to the above configuration, the first engagement means and the second engagement means are mounted at predetermined positions on the inner peripheral surface side of the insertion tube portion of the new T-shaped tube and the reception tube portion of the buried water pipe. The first inner pipe joint and the second inner joint mounted at a predetermined position on the inner peripheral surface side of the movable connecting pipe of the newly installed T-shaped pipe and the inlet pipe portion of the buried water pipe are in the direction of the pipe axis by water pressure. Misalignment can be prevented.

  According to a ninth feature of the present invention, in the connection structure for a new T-shaped pipe having the above-described eighth feature, each of the first pipe joint and the second pipe joint extends over both adjacent inner peripheral surfaces. Each of the first engagement means and the second engagement means includes a watertight annular seal material to be attached and a pressure-bonding means for pressing and fixing the annular seal material to the inner peripheral surfaces. A locking body projecting from at least one inner peripheral surface, and an annular locking groove formed on the outer peripheral surface side of the annular sealing material in a state of engaging with the locking body from the pipe radial direction. It is in the point.

  According to the above configuration, not only the first pipe joint and the second pipe joint can be securely held at the predetermined mounting position against water pressure, but the locking body and the locking groove for this purpose are also provided. It can also serve as a positioning member for mounting the annular sealing material.

Sectional drawing of the valve chamber structure before construction which shows 1st Embodiment of this invention Expanded cross-sectional view of the existing T-tube connection structure Sectional view when working openings are formed Sectional view when cutting and separating existing T-shaped tube Cross-sectional view during end-to-end dimension adjustment Cross-sectional view of the new T-tube at the time of delivery Half-cut side view of new T-tube Front view of new T-tube Enlarged sectional view during connection by the first outer connecting means Enlarged sectional view during connection by the second outer connecting means Expanded cross-sectional view during fixed connection by fixed connection means Enlarged cross-sectional view during connection with the first pipe joint and the second pipe joint Expanded sectional view of the first outer connecting means and the first in-pipe joint Enlarged sectional view of the second outer connecting means and the second in-pipe joint Front view during diameter expansion operation by crimping means Perspective view during diameter expansion operation by crimping means Perspective view at the time of fixed connection by crimping means Sectional view when the connection of the new T-tube is completed Sectional view when placing protective concrete The expanded sectional view of the 1st outside connection means and the 1st pipe joint of a 2nd embodiment

[First Embodiment]
FIG. 1 shows a main pipe laying a buried water pipe P having a large diameter (generally 900 mm or more) capable of being piped by a person along a water pipe route such as directly below a main road. The valve chamber 1 constructed in the middle of the pipe line is shown, and in the valve chamber 1, the receiving pipe portion 2 of the upstream buried water pipe P and the inlet pipe portion 3 of the downstream buried water pipe P are provided. The existing T-shaped tube 4 fitted and connected to the valve, the gate valve 5 flange-joined to the branch pipe portion 4A of the existing T-shaped tube 4, and the air valve 6 flange-joined to the gate valve 5 are accommodated. Yes.

  The valve chamber 1 is formed in a box shape with a bottom wall 1A, a side wall 1B, and a ceiling wall 1C made of reinforced concrete, and a cylinder made of reinforced concrete that forms a human hole 7 that opens to the ground on the ceiling wall 1C. A wall 1D is formed, and an iron lid 1E is provided at the upper opening of the cylindrical wall 1D.

  As shown in FIG. 2, the upstream insertion tube portion 4B, which is one end side in the tube axis direction of the existing T-shaped tube 4, is connected to the receiving tube portion 2 of the upstream buried water pipe P. It is made of rubber to seal the space between these opposing surfaces between the outer peripheral surface of the insertion tube portion 4B and the inner peripheral surface of the receiving tube portion 2 in a watertight manner. A sealing material 12 is attached, and an annular push ring 13 capable of compressing the sealing material 12 from the tube axis direction is externally mounted on the insertion tube portion 4B of the existing T-shaped tube 4. And the connecting flange 2A of the receiving pipe portion 2 by the tightening operation of the bolt 9 and the nut 10 and the receiving pipe of the buried water pipe P by the frictional force when the sealing material 12 is compressed in a watertight state. It is comprised so that the part 2 and the insertion tube part 4B of the existing T-shaped pipe 4 may be fixedly connected.

  Further, as shown in FIG. 2, the downstream receiving pipe portion 4 </ b> D which is the other end side in the tube axis direction of the existing T-shaped pipe 4 has the insertion pipe portion 3 of the buried water pipe P on the downstream side. Are inserted and connected from the pipe axis direction, and the gap between the outer peripheral surface of the insertion pipe portion 3 of the buried water pipe P and the inner peripheral surface of the receiving pipe portion 4D of the existing T-shaped pipe 4 A rubber sealing material 12 for sealing between the surfaces in a watertight state is mounted, and the sealing material 12 can be compressed from the tube axis direction in the insertion pipe portion 3 of the buried water pipe P. When an annular push ring 13 is mounted on the exterior and the sealing material 12 is compressed in a watertight state by tightening a bolt 9 and a nut 10 mounted between the push ring 13 and the connection flange 4E of the receiving pipe portion 4D. The receiving pipe part 4D of the existing T-shaped pipe 4 and the inlet pipe part 3 of the buried water pipe P are fixedly connected by the frictional force of It has been.

  Next, the existing T-shaped tube 4 with the air valve 6 is replaced with a new steel-made T-shaped tube having a protruding tube portion (branch tube portion) 15 having a diameter (600 mm in this embodiment) through which a person can enter and exit. The connection structure of the newly installed T-shaped tube A when replaced with A will be described with reference to FIGS.

  As shown in FIGS. 7, 8, and 18, the newly installed T-shaped pipe A includes the protruding pipe portion 15 protruding upward with a diameter capable of forming a human hole and the receiving port of the buried water pipe P on the upstream side. An insertion tube portion 16 that is fitted and connected to the tube portion 2 from the tube axis direction, and a fixed connection tube portion 17 that protrudes downstream in a concentric state with the insertion tube portion 16 are integrally formed. A T-shaped main pipe A1 and an insertion pipe part 3 of the downstream buried water pipe P can be externally connected from the pipe axis direction, and can be connected to the fixed connection pipe part 17 in the pipe axis direction. And a movable connecting tube A2 that is internally fitted and held so that it can be expanded and contracted.

  The insertion tube portion 16 and the fixed connection tube portion 17 of the T-shaped main pipe A1 are formed to have the same diameter, and the inner diameters of the insertion tube portion 16 and the fixed connection tube portion 17 are the mortar lining layer 11. Is configured to be the same as or substantially the same as the inner diameter of the buried water pipe P from which peeling has occurred.

  The movable connecting pipe A2 has a small-diameter pipe part 18 having an outer diameter slightly smaller than the inner diameter of the fixed connecting pipe part 17 of the T-shaped main pipe A1, and the inner and outer diameters of the fixed connecting pipe part 17. A medium-diameter pipe portion 19 having a diameter and a large-diameter pipe portion 20 having an inner diameter slightly larger than the outer diameter of the insertion pipe portion 3 in the buried water pipe P on the downstream side are integrally formed. And is fixed between the small-diameter pipe portion 18 and the medium-diameter pipe portion 19 when the movable connection tube A2 is contracted and moved in the tube axis direction with respect to the fixed connection pipe portion 17. An annular wall portion 21 that also serves as a stopper is formed on the end surface of the connecting tube portion 17 from the tube axis direction.

  Between the outer peripheral surface of the insertion tube portion 16 of the T-shaped main pipe A1 and the inner peripheral surface of the receiving tube portion 2, as shown in FIGS. A rubber O-ring 22 having a function of aligning the insertion tube portion 16 and the reception tube portion 2 is attached to the insertion tube portion 16 of the T-shaped main pipe A1. An annular plate-shaped push ring 27 that pushes the O-ring 22 while compressing the O-ring 22 from the tube axis direction is externally provided, and the bolt 9 and the nut 10 that are mounted between the push ring 27 and the connecting flange 2A of the receiving pipe portion 2. Is configured to connect the insertion tube portion 16 of the new T-shaped tube A and the reception tube portion 2 of the buried water pipe P while aligning with the O-ring 22 that is pushed in, and with this configuration, On the outer peripheral surface side of the insertion tube portion 16, the insertion tube portion 16 of the new T-shaped tube A and the reception tube portion 2 of the buried water pipe P are connected. The first outer connection means B for forming is configured.

  A rubber O-ring 23 is attached to the inner peripheral surface of the large-diameter pipe portion 20 of the movable connecting pipe A2 so as to seal the space between the outer peripheral surface of the inlet pipe portion 3 in the downstream buried water pipe P. In addition, fixing bolts 24 that are fastened and fixed to the outer peripheral surface of the insertion tube portion 3 from the outside in the tube radial direction are screwed into a plurality of locations in the circumferential direction of the large-diameter tube portion 20. A second outer connection for fixing and connecting the movable connecting pipe A2 of the newly installed T-shaped pipe A and the inlet pipe part 3 of the buried water pipe P in a watertight state on the outer peripheral surface side of the inlet pipe part 3 with the fixing bolt 24. Means C are configured.

  In this embodiment, since the lower space between the large-diameter pipe portion 20 of the movable connecting pipe A2 and the bottom wall 1A of the valve chamber 1 is narrow and an operation space cannot be secured, as shown in FIG. In addition, the fixing bolt 24 is not provided in the lower region of the large-diameter pipe portion 20.

  A connecting flange 15A is integrally formed in the upper opening portion of the outer peripheral surface of the protruding pipe portion 15 of the T-shaped main pipe A1, and the fixed connection pipe portion 17 is provided at a plurality of locations in the circumferential direction as shown in FIG. In addition, a centering bolt 25 that is brought into contact with the outer peripheral surface of the small-diameter pipe portion 18 of the movable connecting pipe A2 from the outside in the radial direction and adjusts the T-shaped main pipe A1 and the movable connecting pipe A2 in a concentric state is screwed. Furthermore, between the fixed connecting pipe portion 17 of the T-shaped main pipe A1 and the small-diameter pipe portion 18 of the movable connecting pipe A2, a screw type for extending the movable connecting pipe A2 along the tube axis direction. An expansion / contraction operation mechanism 26 is provided.

  As shown in FIG. 7, the expansion / contraction operation mechanism 26 has bolts at a plurality of locations in the circumferential direction of the fixed connection tube portion 17 of the T-shaped main pipe A1 and at a plurality of locations in the circumferential direction of the medium diameter tube portion 19 of the movable connection tube A2. The fixing pieces 26A and 26B provided with the insertion holes are fixed, and the fixing bolts 26C and four which have a pushing stroke longer than the extending operation stroke of the movable connecting pipe A2 are arranged over the fitting pieces 26A and 26B facing each other in the tube axis direction. Two nuts 26D are mounted.

  When the movable connecting pipe A2 is extended along the axial direction of the pipe axis, the two nuts 26D on the movable connecting pipe A2 side are maintained in a state of holding and fixing the mounting piece 26B, and the T-shaped main pipe. Of the two nuts 26D on the A1 side, the outermost nut 26D on the most upstream side is loosened by an amount corresponding to the extension operation, and the inner nut 26D is rotated to the tightening side, so that the movable connecting pipe A2 is on the downstream side. Pushed to the side.

  It can be carried into the new T-shaped tube A through the protruding tube portion 15 of the T-shaped main pipe A1, and the insertion tube portion 16 of the new T-shaped tube A and the receiving tube portion 2 of the buried water pipe P It can be carried into the new T-shaped tube A through the first inner joint D connected in a water-tight state on the inner peripheral surface side of the insertion tube portion 16 and the projecting tube portion 15 of the T-shaped main tube A1. A second inner joint E for connecting the movable connecting pipe A2 of the character pipe A and the insertion pipe part 3 of the buried water pipe P in a watertight state on the inner peripheral surface side of the medium diameter pipe part 19, and the first outer connection After the completion of the connection by the means B and the second outer connection means C, there is provided a fixed connection means F for fixing and connecting the fixed connection pipe part 17 of the T-shaped main pipe A1 and the small diameter pipe part 18 of the movable connection pipe A2 in a watertight state. In addition, the first in-pipe joint D and the second in-pipe joint E are configured in the same structure.

  As shown in FIG. 13, the inner pipes 16 of the new T-shaped pipe A and the inner peripheral surfaces of the receiving pipe part 2 of the buried water pipe P and the first pipe joint D are opposed to each other. The first engagement means 28 for preventing the movement of the first in-pipe joint D due to the water pressure in the direction of the tube axis is provided, and the movable connecting pipe A2 of the new T-shaped pipe A and the buried water supply As shown in FIG. 14, the pipe axis direction of the second pipe joint E caused by water pressure is provided at a portion where both inner peripheral surfaces of the insertion tube portion 3 of the pipe P and the second pipe joint E are opposed to each other. A second engagement means 29 is provided to prevent the movement at the position.

  As shown in FIGS. 12 to 18, the first pipe joint D includes an inner peripheral surface of the inlet pipe portion 2 of the adjacent buried water pipe P and an inner peripheral surface of the inlet pipe portion 16 of the new T-shaped pipe A. And an annular rubber inner band 31 which is an example of a water-tight annular seal material, and which is entirely constituted by a water-tight elastic seal layer, is attached to both ends of the inner band 31 in the tube axis direction. Crimping means 32 is provided to press and fix the two against the inner peripheral surfaces.

  The inner surface band 31 is formed in an annular shape with an outer diameter of the same or substantially the same size as the inner diameters of the two inner peripheral surfaces, and at three locations on the outer peripheral surface of the inner surface band 31 in the tube axis direction, Annular seal portions 31a that contact both inner peripheral surfaces and their boundary portions are integrally formed to project outward in the radial direction of the tube, and each of both end portions 31b in the tube axis direction of the inner surface band 31 includes: In order to come into contact with both the inner peripheral surfaces in substantially the same sealing state as the annular seal portion 31a, outward in the radial direction to the same position as a virtual straight line passing through the tip of the annular seal portion 31a. It is bent to the side.

  An annular rib 31c is integrally formed at least at three locations in the tube axis direction on the inner circumferential surface of the inner surface band 31, and an annular groove 31d formed between the annular ribs 31c is connected to the crimping means 32. It is comprised in the annular groove | channel for mounting with respect to the two crimping tools to comprise.

  As shown in FIG. 13, the first engagement means 28 includes a rail-like locking body 28 </ b> A that protrudes along the circumferential direction on the inner peripheral surface of the insertion tube portion 16 of the new T-shaped tube A. The annular locking groove 28B is formed on the outer peripheral surface side of the inner surface band 31 so as to engage with the locking body 28A from the pipe radial direction.

  The second engaging means 29 has the same structure as the first engaging means 28 described above and, as shown in FIG. 14, extends along the circumferential direction on the inner peripheral surface of the medium diameter pipe portion 19 of the movable connecting pipe A2. Rail-shaped locking body 29A provided in a protruding manner, and an annular locking groove 29B formed on the outer peripheral surface side of the inner surface band 31 in a state of engaging with the locking body 29A from the tube radial direction. ing.

  The locking body 28A and the locking body 29A are fixed in advance to the inner peripheral surface of the insertion tube portion 16 of the new T-shaped tube A and the inner peripheral surface of the medium-diameter tube portion 19 of the movable connecting tube A2. .

  As shown in FIGS. 15 to 17, each of the two crimping tools constituting the crimping means 32 is formed in an annular shape with an outer diameter that is the same as or substantially the same as the inner diameter of the mounting annular groove 31 d of the inner surface band 31. At both ends of the inner peripheral surface of the metal pressure-bonding band 33 that is curved and is elastically deformable in the pipe diameter direction (expanded side and reduced diameter side) divided at one place in the circumferential direction, A prismatic locking projection 34 projecting inward in the tube radial direction is provided, and a locking recess 35a is formed on the both locking projections 34 so as to be detachable from the inner side in the tube radial direction. A diameter increasing operation mechanism 32A including a certain locking body 35 and moving the both locking bodies 35 away from each other along the inner peripheral surface of the inner surface band 31, and a distance increased by the diameter expanding operation mechanism 32A. A fixed connection mechanism 32B for fixing and connecting the locking protrusion 34 is provided.

  The diameter expansion operation mechanism 32A has a hexagonal cross section rotation operation portion 36b at a central position in the screw axis direction of the operation screw shaft 36 in which right and left screw portions 36a having opposite screwing directions are formed on both sides. , And a screw hole that is screwed into both screw portions 36a of the operation screw shaft 36 is formed in the pivot support pin 37 that is rotatably supported by the rotation operation portion 36b. The pivot pins 37 are moved in the perspective direction along the screw axis direction by the rotation operation of the rotation operation portion 36b of the screw shaft 36.

  To constitute the fixed connection mechanism 32B, an inner band is formed on one surface of a fixed connection plate 39 that is screwed and fixed with a bolt 38 to a screw hole 34a formed in the locking projection 34 along the tube axis direction. A trapezoidal interval holding plate 39A having both inclined surfaces 39a that are narrower toward the tip end side that can enter between both end faces of the pressure-bonding band 33 along the inner peripheral surface of 31; The guide plate 39B having the same shape is fixed at an interval corresponding to the thickness of the stopper plate 40 fixed to both end portions of the inner peripheral surface of the pressure-bonding band 33.

  On the other hand, on both end surfaces of the pressure-bonding band 33, inclined surfaces 33a having the same gradient that can be brought into contact with both the inclined surfaces 39a of the spacing plate 39A are formed. In order to prevent the interval holding plate 39A applied to both inclined surfaces 33a of the body 33 from moving inwardly in the radial direction of the pipe, it protrudes from the inclined surface 33a to the approach path side of the interval holding plate 39A. In the state, it is fixed to both end portions of the inner peripheral surface of the pressure-bonding band 33.

  Further, the bolt insertion hole 39b of the fixed connecting plate 39 is a long hole capable of absorbing the variation in the center interval (mounting interval) of the screw holes 34a of the both locking projections 34 due to the diameter expansion operation of the diameter expansion operation mechanism 32A. It is configured.

  When the pressure-bonding band 33 is pressed and fixed to the inner peripheral surface of the inner surface band 31 with a predetermined pressing force by the diameter-expansion operation of the diameter-expansion operation mechanism 32A, both inclined surfaces of the spacing plate 39A of the fixed connection mechanism 32B 39a is applied to the inclined surfaces 33a formed on both end surfaces of the pressure-bonding band 33, and the bolts 38 inserted into both bolt insertion holes 39b of the fixed connecting plate 39 in this state are both locked to the pressure-bonding band 33. The projection 34 is screwed and fixed to the screw hole 34a.

  The second in-pipe joint E has the same structure as the first in-pipe joint D described above, and therefore, the same components as those in the first in-pipe joint D are denoted by the same reference numerals and the description thereof is omitted. Is omitted.

  The fixed connecting means F is divided into two parts that are fixed by partial welding while being in contact with the end surface of the fixed connecting pipe portion 17 of the T-shaped main pipe A1 and the outer peripheral surface of the small diameter pipe portion 18 of the movable connecting pipe A2. The outer ring 42 of the structure is fixed to the inner peripheral surface of the fixed connecting pipe portion 17 of the T-shaped main pipe A1 and the end surface of the small diameter pipe portion 18 of the movable connecting pipe A2 by all-around welding. The inner ring 43 has a two-part structure.

  Next, the existing T-shaped tube 4 with the air valve 6 is replaced with a new steel plate provided with a protruding tube portion 15 having a diameter (600 mm in this embodiment, generally 500 mm or more in this embodiment) through which a person can go in and out. A T-pipe replacement method for a water pipe system that is replaced with a manufactured T-tube A in a water-stopped state will be described with reference to FIGS.

[1] FIG. 3 shows a state in which the upper constituent layer of the valve chamber 1 including the ceiling wall 1C and the cylindrical wall 1D is removed by means such as excavation in a state where the bottom wall 1A and the side wall 1B constituting the valve chamber 1 are left. , A step of forming a working opening 8 capable of removing the existing T-shaped tube 4 and carrying in the new T-shaped tube A at the upper part of the valve chamber 1, and an air valve from the branch pipe portion 4A of the existing T-shaped tube 4 The process of removing 6 and the gate valve 5 is shown.

[2] FIG. 4 shows a process of removing the existing T-shaped tube 4, and a circular shape with a radius that allows a person to enter and exit the upper tube peripheral wall of the existing T-shaped tube 4 with the axial center of the branch tube portion 4A as a substantial center. Cut with an engine cutter or the like, enters the pipe through the cut-out entrance (manhole) 4C, cuts along the circumferential cutting lines a and b with a width slightly larger than the diameter of the entrance 4C, After the existing T-shaped tube 4 is cut and separated into three in the tube axis direction, it is sequentially removed from the cut and separated piece on the center side.

  In the general valve chamber 1, the space between the bottom wall 1A and the side wall 1B constituting the valve chamber 1 and the outer peripheral surface of the existing T-shaped tube 4 is narrow, in particular, between the existing T-shaped tube 4 and the bottom wall 1A. There are many sites where the work space cannot be secured due to the narrow space below. Therefore, as described above, the work space is secured inside the pipe by forming the entrance / exit 4C in the upper pipe peripheral wall of the existing T-shaped pipe 4, and the cutting and separation work efficiency of the existing T-shaped pipe 4 is improved. Can do.

  Further, the length L in the tube axis direction of the cut and separated piece on the central side to be cut and separated is between the insertion tube portion 4B of the existing T-shaped tube 4 and the receiving tube portion 2 of the buried water pipe P on the upstream side. The fitting connection and the fitting connection between the receiving pipe part 4D of the existing T-shaped pipe 4 and the insertion pipe part 3 of the buried water pipe P on the downstream side can be released, and people can go in and out without difficulty. The dimensions are set to be possible.

[3] FIG. 5 shows a process for adjusting the dimension between the end faces of the two buried water pipes P, and the end face of the inlet pipe part 2 of the upstream buried water pipe P and the inlet pipe part 3 of the downstream buried water pipe P. Of the buried water pipe P with a cutting dimension obtained by subtracting the measured inter-end face dimension from the set inter-end face dimension so that the distance from the end face becomes the set inter-end face dimension into which the new T-shaped pipe A can be inserted and arranged. The insertion tube part 3 is cut | disconnected and dimensions are adjusted.

  Further, when the outer peripheral surface side of the cut end surface of the insertion tube portion 3 is chamfered, and the movable connection tube A2 of the new T-shaped tube A is externally fitted to the insertion tube portion 3, this movable connection tube Damage to the O-ring 23 attached to the inner peripheral surface of the A2 large-diameter pipe portion 20 is avoided.

  Furthermore, each inner surface band 31 of the 1st pipe joint D and the 2nd pipe joint E is used for the mortar lining layer 11 given to each inner peripheral surface of the upstream buried water pipe P and the downstream buried water pipe P. The installation work area slightly wider than the installation area is peeled off, the metal surface of the installation work area of both of the buried water pipes P is smoothed, and a putty for base formation is applied and then synthesized as a base coat. Apply resin paint.

[4] FIG. 6 shows that the new T-shaped tube A is carried in from the working opening 8 and the end surface of the receiving pipe portion 2 of the upstream buried water pipe P and the insertion pipe portion of the buried water pipe P downstream. The arrangement | positioning process arrange | positioned between 3 end surfaces is shown.
As a pre-work of the newly installed T-shaped tube A to be carried in, the movable connecting tube A2 is fixed and held by the expansion / contraction operation mechanism 26 in a state where the movable connecting tube A2 is contracted as much as possible. Has an annular plate-shaped push ring 27 on the exterior.

[5] FIGS. 9 and 10 show that the insertion tube portion 16 of the T-shaped main pipe A1 is fitted and connected to the receiving tube portion 2 of the upstream buried water pipe P, and the movable connection tube A2 is extended. The connection process which carries out external fitting connection to the insertion pipe part 3 of the buried water pipe P of the downstream is shown.

  First, as shown in FIG. 9, a new T-shape disposed between the end face of the inlet pipe portion 2 of the upstream buried water pipe P and the end face of the inlet pipe portion 3 of the downstream buried water pipe P. The pipe A is moved to the upstream side, and the insertion pipe part 16 of the T-shaped main pipe A1 is fitted into the receiving pipe part 2 of the upstream buried water pipe P from the pipe axis direction to receive the pusher wheel 27 and the receiving pipe part 27. The connecting flange 2A of the mouth pipe part 2 is tightened with bolts 9 and nuts 10, and the inlet pipe part 16 of the new T-shaped pipe A and the receiving pipe of the buried water pipe P are aligned with the O-ring 22 to be pushed in. The part 2 is connected.

  The connection between the insertion tube portion 16 of the new T-shaped tube A and the reception tube portion 2 of the buried water pipe P is connected to the insertion tube portion 16 of the new T-shaped tube A and the reception tube portion of the embedded water pipe P. A part of the 1st watertight connection process which connects 2 in a watertight state is comprised. That is, the first half of the first water-tight connection step using the first outer connection means B for connecting the new T-shaped tube A and the upstream buried water pipe P on the outer peripheral surface side of the insertion tube portion 16 is configured. Yes.

  Next, as shown in FIG. 10, the screw-type expansion / contraction operation mechanism 26 provided between the fixed connection pipe portion 17 of the T-shaped main pipe A1 and the medium diameter pipe portion 19 of the movable connection pipe A2 is extended. After the large-diameter pipe portion 20 of the movable connecting pipe A2 is externally fitted to the insertion pipe section 3 in the downstream buried water pipe P from the tube axis direction, the large-diameter pipe portion 20 of the movable connecting pipe A2 is The fixing bolts 24 screwed into a plurality of locations in the circumferential direction are tightened to fix and connect the movable connecting pipe A2 of the newly installed T-shaped pipe A and the inlet pipe portion 3 of the buried water pipe P in a watertight state.

  The connection between the movable connecting pipe A2 of the new T-shaped pipe A and the inlet pipe portion 3 of the buried water pipe P is connected to the movable connecting pipe A2 of the new T-shaped pipe A and the inlet pipe of the downstream buried water pipe P. A part of 2nd watertight connection process which connects the part 3 with a watertight state is comprised. In other words, the first half of the second watertight connection step using the second outer connection means C for connecting the new T-shaped pipe A and the downstream buried water pipe P in a watertight state on the outer peripheral surface side of the insertion tube portion 3 is performed. It is composed.

[6] FIG. 11 shows the connection pipe portion 17 of the T-shaped main pipe A and the small diameter pipe of the movable connection pipe A2 after the movable connection pipe A2 is externally connected to the insertion pipe portion 3 of the buried water pipe P. The 3rd watertight connection process which connects the part 18 in a watertight state is shown.

  First, on the outer side of the tube, partial welding is performed with an outer ring 42 having a two-part structure applied to the end surface of the fixed connection tube portion 17 of the T-shaped main tube A1 and the outer peripheral surface of the small diameter tube portion 18 of the movable connection tube A2. After fixing with the inner ring 43, the inner ring 43 having a two-part structure is applied to the inner peripheral surface of the fixed connecting pipe portion 17 of the T-shaped main pipe A1 and the end surface of the small diameter pipe portion 18 of the movable connecting pipe A2 inside the pipe. In this state, it is fixed by all-around welding.

[7] FIGS. 12 to 14 show that the new T-shaped tube A can be carried into the new T-shaped tube A through the opening of the projecting tube portion 15, and the upstream-side buried water pipe P is connected to the inlet tube portion. 16 can be carried into the new T-shaped pipe A through the latter half of the first watertight connection step using the first pipe joint D that is connected in a watertight state on the inner peripheral surface side, and through the opening of the projecting pipe portion 15; The latter half of the 2nd watertight connection process using the 2nd pipe joint E which connects the newly installed T-shaped pipe A and the buried water pipe P of the downstream side in the watertight state in the inner peripheral surface side of the insertion tube part 3 is shown.

  First, in the second half of the first watertight connection step, as shown in FIGS. 12 and 13, the inner peripheral surface of the receiving pipe part 2 of the adjacent buried water pipe P and the inlet pipe part 16 of the new T-shaped pipe A are used. An annular rubber inner surface band 31 is formed on the outer peripheral surface side of the annular rubber inner band 31, and an annular locking groove 28 </ b> B is formed on the inner peripheral surface of the insertion tube portion 16 of the new T-shaped tube A. It is mounted in a state of engaging with a rail-like locking body 28A protruding along the circumferential direction, and the crimping means 32 is configured in both mounting annular grooves 31d on the inner peripheral surface side of the inner surface band 31. The crimping strips 33 of the two crimping tools are mounted.

  Next, as shown in FIGS. 15 and 16, the engaging protrusions 34 provided at both ends of the inner peripheral surface of the crimping strip 33 are engaged with the engaging members 35 in the diameter expanding operation mechanism 32 </ b> A of the crimping tool. When the locking recess 35a is engaged and the rotation operation portion 36b of the diameter expansion operation mechanism 32A is rotated to the diameter expansion side, both the locking bodies 35 move away along the inner peripheral surface of the inner surface band 31. Due to the diameter expansion deformation of the pressure-bonding band 33, the inner peripheral surface of the inner side band 31 in the axial direction of the inner pipe 31 and the inner circumference of the inlet pipe portion 2 of the buried water pipe P and the inner circumference of the inlet pipe portion 16 of the new T-shaped pipe A are provided. Press and fix to the surface in a watertight state.

  Next, as shown in FIGS. 17 and 18, when the pressure-bonding band 33 is pressed and fixed to the inner peripheral surface of the inner surface band 31 with a predetermined pressing force by the diameter expansion operation of the diameter expansion operation mechanism 32A, the fixed connection Both inclined surfaces 39a of the spacing plate 39A of the mechanism 32B are applied to inclined surfaces 33a formed on both end surfaces of the pressure-bonding band 33, and in this state, are inserted into both bolt insertion holes 39b of the fixed connecting plate 39. The bolt 38 is screwed and fixed to the screw hole 34 a of both the locking projections 34 of the crimping strip 33.

  In the second half of the second watertight connection step, as shown in FIGS. 12 and 14, the inner peripheral surface of the inner diameter pipe portion 19 of the adjacent movable connecting pipe A <b> 2 and the inner circumference of the inlet pipe portion 3 of the buried water pipe P are used. An annular retaining groove 29B formed on the outer peripheral surface side of the annular rubber inner band 31 over the surface is formed in the circumferential direction on the inner peripheral surface of the medium-diameter pipe portion 19 of the new T-shaped tube A. Are attached in a state of engaging with a rail-like locking body 29A projecting along the inner circumferential surface of the inner band 31, and two crimping means constituting the crimping means 32 are formed in both mounting annular grooves 31d on the inner peripheral surface side of the inner surface band 31. A tool band 33 is attached.

  Next, as shown in FIGS. 15 and 16, the engaging protrusions 34 provided at both ends of the inner peripheral surface of the crimping strip 33 are engaged with the engaging members 35 in the diameter expanding operation mechanism 32 </ b> A of the crimping tool. When the locking recess 35a is engaged and the rotation operation portion 36b of the diameter expansion operation mechanism 32A is rotated to the diameter expansion side, both the locking bodies 35 move away along the inner peripheral surface of the inner surface band 31. Due to the diameter expansion deformation of the pressure-bonding strip 33, the inner peripheral surface of the inner diameter band portion 19 of the movable connecting pipe A2 and the inner peripheral surface of the inlet pipe portion 3 of the buried water pipe P are formed on both sides in the tube axis direction of the inner surface band 31. Press and fix in a watertight state.

  Next, as shown in FIGS. 17 and 18, when the pressure-bonding band 33 is pressed and fixed to the inner peripheral surface of the inner surface band 31 with a predetermined pressing force by the diameter expansion operation of the diameter expansion operation mechanism 32A, the fixed connection Both inclined surfaces 39a of the spacing plate 39A of the mechanism 32B are applied to inclined surfaces 33a formed on both end surfaces of the pressure-bonding band 33, and in this state, are inserted into both bolt insertion holes 39b of the fixed connecting plate 39. The bolt 38 is screwed and fixed to the screw hole 34 a of both the locking projections 34 of the crimping strip 33.

  When the second half of the first watertight connection step and the second half of the second watertight connection step are completed, the epoxy resin paint is applied to the metal surface of the mounting work area of the buried water pipe P exposed between the inner surface band 31 and the mortar lining layer 11. Apply.

[8] FIG. 19 shows a concrete placing process for embedding at least the lower half side portion of the new T-shaped pipe A with the protective concrete 13 after the first watertight connection process and the second watertight connection process.
In this embodiment, the protective concrete 13 is placed up to the middle of the upper and lower sides of the projecting tube portion 15 of the new T-shaped tube A.

  The construction is completed by the placement of the protective concrete 13 to prepare for the work after dredging. Generally, however, an air valve is provided on the projecting pipe portion 15 of the new T-shaped pipe A via a flange lid or a gate valve. Install.

[Second Embodiment]
In the first embodiment described above, since the lower space between the new T-shaped tube A and the bottom wall 1A of the valve chamber 1 is narrow and an operation space cannot be secured, the insertion of the new T-shaped tube A is not possible. The first outer connecting means B for connecting the mouth pipe part 16 and the receiving pipe part 2 of the buried water pipe P on the outer peripheral surface side of the insertion pipe part 16 and a newly installed through the protruding pipe part 15 of the new T-shaped pipe A The insertion tube 16 of the new T-shaped tube A and the receiving tube 2 of the buried water pipe P can be brought into the T-shaped tube A in a watertight state on the inner peripheral surface side of the insertion tube 16. A second outer connection for connecting the first inner joint D to be connected, the movable connecting pipe A2 of the newly installed T-shaped pipe A, and the inlet pipe portion 3 of the buried water pipe P on the outer peripheral surface side of the inlet pipe portion 3. It can be carried into the new T-shaped tube A through the means C and the protruding tube portion 15 of the new T-shaped tube A, and the movable connecting tube A2 of the new T-shaped tube A. Although the second pipe inner joint E that connects the inlet pipe portion 3 of the buried water pipe P to the inner peripheral surface side in a watertight state is provided, the new T-shaped pipe A and the bottom wall 1A of the valve chamber 1 If the lower space is wide and the operation space can be secured, the first outer connecting means B and the second outer connecting means C may be fixedly connected in a watertight state.

In this case, in the first outer connecting means B, as shown in FIG. 20, as the push ring 27, the outer peripheral surface of the insertion tube portion 16 of the T-shaped main pipe A1 and the inner peripheral surface of the receiving tube portion 2 are used. A push ring 27A having a pressing portion 27a capable of pressing and compressing the sealing material 22 mounted between the two is used.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Other Embodiments]
(1) As said 1st outer side connection means B, the insertion pipe part 16 of the said new T-shaped pipe A and the receiving pipe part 2 of one buried water pipe P are formed in the outer peripheral surface side of the insertion pipe part 16. Any structure that can be connected in a watertight state or a non-watertight state may be used.

  (2) As said 1st pipe joint D, it can carry in in the newly installed T-shaped pipe A through the said projecting pipe part 15, and the insertion pipe part 16 of the newly installed T-shaped pipe A and one buried water pipe P Any structure may be used as long as it can be connected to the receiving pipe portion 2 in a watertight state on the inner peripheral surface side.

  (3) As the second outer connecting means C, the movable connecting pipe A2 of the newly installed T-shaped pipe A and the inlet pipe part 3 of the other buried water pipe P are watertight on the outer peripheral surface side of the inlet pipe part 3. Any structure may be used as long as it can be connected in a state or a non-watertight state.

  (4) As said 2nd pipe inner joint E, it can carry in into the newly installed T-shaped pipe A through the protruding pipe part 15, and the insertion port of the movable connecting pipe A2 of the newly installed T-shaped pipe A and the other buried water pipe P Any structure may be used as long as it can be connected to the tube portion 3 in a watertight state on the inner peripheral surface side of the insertion tube portion 3.

  (5) As the fixed connecting means F, after the movable connecting pipe A2 is externally connected to the insertion pipe section 3 of the buried water pipe P, the fixed connecting pipe section 17 and the movable connecting pipe of the T-shaped main pipe A1 are connected. Any structure may be used as long as it can connect A2 in a watertight state.

(6) In the first embodiment described above, the locking body 28A of the first engagement means 28 is provided on the inner peripheral surface of the insertion tube portion 16 of the new T-shaped tube A, but this locking body 28A. May be protruded from the inner peripheral surface of the receiving pipe portion 2 of the buried water pipe P, and the engaging body 28A may be protruded from both inner peripheral surfaces. Correspondingly, the formation position and number of the locking grooves 28B formed on the outer peripheral surface side of the inner surface band 31 are changed.
Moreover, you may comprise the said latching | locking body 28A from the some protrusion interrupted in a pipe circumferential direction.

(7) In the first embodiment described above, the locking body 29A of the second engagement means 29 is provided on the inner peripheral surface of the middle-diameter pipe portion 19 of the movable connecting pipe A2. May be protruded from the inner peripheral surface of the insertion tube portion 3 of the buried water pipe P, and the engaging body 29A may be protruded from both inner peripheral surfaces. Correspondingly, the formation position and number of locking grooves 29B formed on the outer peripheral surface side of the inner surface band 31 are changed.
Moreover, you may comprise the said latching body 29A from the some protrusion interrupted in a pipe circumferential direction.

  (8) An existing T with an air valve 6 and both pipe ends facing each other in the middle of the pipe pipe P having a diameter capable of being operated by a person in the pipe chamber 1 and spaced in the direction of the pipe axis. When both ends of the pipe 4 are flange-bonded, the end of both buried water pipes P facing each other in the valve chamber 1 and the both ends of the new T-shaped pipe A are flange-bonded. Also good.

A New T-shaped pipe A1 T-shaped main pipe A2 Movable connecting pipe B First outer connecting means C Second outer connecting means D First inner joint E Second inner joint F Fixed connecting means P Buried water pipe 1 Valve chamber 2 Receiving port Tube portion 3 Insertion tube portion 4 Existing T-shaped tube 6 Air valve 8 Work opening 13 Protective concrete 15 Projection tube portion 16 Insertion tube portion 28 First engagement means 28A Locking body 28B Locking groove 29 Second engagement Means 29A Locking body 29B Locking groove 31 Annular sealing material (inner surface band)
32 Crimping means

Claims (9)

Water supply that replaces existing T-shaped pipes with air valves that are connected in the middle of caliber buried water pipes that allow humans to work inside the pipes with new T-shaped pipes that have protruding pipe parts that allow people to enter and exit It is a T-tube replacement method for piping system,
An opening forming step for forming an opening for operation in which an existing T-shaped tube can be removed and a new T-shaped tube can be carried in an upper portion of a valve chamber constructed around the existing T-shaped tube;
An existing T-shaped pipe removing step for removing an existing T-shaped pipe connected to an end of one buried water pipe and an end of the other buried water pipe in the valve chamber;
An arrangement step of arranging the new T-shaped pipe carried through the working opening between the end faces of both buried water pipes;
A connecting step of connecting one end of the new T-shaped pipe and an end of one buried water pipe, and connecting the other end of the new T-shaped pipe and an end of the other buried water pipe;
A first watertight connection step of connecting one end of the new T-shaped pipe and one end of one buried water pipe in a watertight state;
A second watertight connection step of connecting the other end of the new T-shaped tube and the end of the other buried water pipe in a watertight state;
A T-pipe replacement method for water supply piping systems. Water supply that replaces existing T-shaped pipes with air valves that are connected in the middle of caliber buried water pipes that allow humans to work inside the pipes with new T-shaped pipes that have protruding pipe parts that allow people to enter and exit It is a T-tube replacement method for piping system,
An opening forming step for forming an opening for operation in which an existing T-shaped tube can be removed and a new T-shaped tube can be carried in an upper portion of a valve chamber constructed around the existing T-shaped tube;
An existing T-shaped tube removal step of cutting and removing the existing T-shaped tube that is fitted and connected to the receiving pipe portion of one buried water pipe and the insertion tube portion of the other buried water pipe in the valve chamber;
A dimension adjustment process between end faces, in which the insertion tube portion of the buried water pipe is cut and dimensioned so that the new T-shaped pipe can be inserted between the end faces of the both buried water pipes,
An insertion tube portion that can be internally fitted and connected to the receiving tube portion of the one buried water pipe from the tube axis direction, and an outer fitting from the tube axis direction to the insertion tube portion of the other buried water pipe Arrangement step of placing the new T-shaped pipe having a connectable movable connecting pipe between the end faces of both buried water pipes carried from the working opening,
A connecting step of internally fitting and connecting the insertion tube portion of the new T-shaped tube to the receiving tube portion of the buried water pipe, and extending and fitting the movable connecting tube to the insertion tube portion of the buried water pipe ,
A first watertight connection step of connecting the insertion tube portion of the new T-shaped tube and the reception tube portion of the buried water pipe in a watertight state;
A second watertight connection step of connecting the movable connection pipe of the new T-shaped pipe and the insertion pipe portion of the buried water pipe in a watertight state;
A T-pipe replacement method for water supply piping systems.   3. A concrete placing step of burying at least a lower half side portion of the new T-shaped tube with protective concrete after completion of the first watertight connection step and the second watertight connection step. The T-pipe replacement method for the water pipe system described.   The first watertight connection step can be carried into the new T-shaped pipe through the first outer connecting means for connecting the new T-shaped pipe and one buried water pipe on the outer peripheral surface side, and the opening of the projecting pipe part, And it is a watertight connection process using the 1st pipe joint which connects a newly installed T-shaped pipe and one buried water pipe in the watertight state in the inner peripheral surface side, The water supply of any one of Claims 1-3 T-tube replacement method for piping systems.   In the second watertight connection step, the new T-shaped pipe and the other buried water pipe are connected in a watertight state on the outer peripheral surface side, and are carried into the new T-shaped pipe through the opening of the protruding pipe portion. It is a watertight connection process which is possible and is a watertight connection process using the 2nd pipe inner joint which connects a new T-shaped pipe and the other buried water pipe in a watertight state on the inner peripheral surface side. The T-pipe replacement method for the water pipe system described.   A T-shaped main pipe in which the new T-shaped tube is integrally formed with the protruding tube portion, the insertion tube portion, and a fixed connection tube portion that is concentric with the insertion tube portion and protrudes toward the movable connection tube side; The movable connection pipe is configured to be fitted and held so as to be extendable and retractable with respect to the fixed connection pipe part, and after the movable connection pipe is externally connected to the insertion pipe part of the buried water pipe The T-tube replacement method for a water pipe system according to claim 2, further comprising a third water-tight connection step for connecting the fixed connection pipe portion of the T-shaped main pipe and the movable connection pipe in a water-tight state.   One buried water pipe among the receiving pipe section and the insertion pipe section facing each other in the middle of the calibrated buried water pipe capable of being operated by a person in the valve chamber and spaced in the direction of the pipe axis. An insertion tube portion on one end side in the tube axis direction of a new T-shaped tube provided with a projecting tube portion having a diameter that allows humans to enter and exit is fitted and connected to the receiving tube portion, and the tube shaft of the new T-shaped tube The movable connecting pipe that can be expanded and contracted provided at the other end in the core direction is externally connected to the insertion pipe section of the other buried water pipe, and the insertion pipe section of the new T-shaped pipe and the receiving pipe of the buried water pipe are received. A first outer connecting means for connecting the mouth tube portion on the outer peripheral surface side, and can be carried into the newly installed T-shaped tube through the protruding tube portion, and the inlet tube portion of the newly installed T tube and the receiving port of the buried water tube A first inner joint that connects the pipe part in a water-tight state on the inner peripheral surface side, a movable connecting pipe of the new T-shaped pipe, and an inlet pipe part of the buried water pipe The second outer connecting means for connecting on the side and the projecting pipe portion can be carried into the new T-shaped pipe, and the movable connecting pipe of the new T-shaped pipe and the inlet pipe section of the buried water pipe are on the inner peripheral surface side. The connection structure of the new T-shaped pipe provided with the 2nd in-pipe joint connected in a watertight state in FIG.   In the part where the inner peripheral surface of the insertion pipe part of the new T-shaped pipe and the receiving pipe part of the buried water pipe and the first pipe joint are opposed to each other, First engagement means for preventing the movement from engaging is provided, and the relative relationship between the inner peripheral surfaces of the movable connecting pipe of the new T-shaped pipe and the inlet pipe portion of the buried water pipe and the second pipe joint 8. The connection structure for a new T-shaped tube according to claim 7, wherein a second engagement means for preventing engagement of the second inner joint in the direction of the tube axis is provided at a portion facing.   Each of the first inner pipe joint and the second inner pipe joint includes a watertight annular seal member mounted over both inner peripheral surfaces, and a pressure-bonding means for pressing and fixing the annular seal member to both inner peripheral surfaces. Each of the first engaging means and the second engaging means is configured to protrude from at least one inner peripheral surface, and the engaging body is engaged with the engaging body from the radial direction. The connection structure of the new T-shaped pipe of Claim 8 comprised from the cyclic | annular latching groove formed in the outer peripheral surface side of the said annular sealing material.

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