JP2001248382A - Jacking method and pipe joint used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jacking method for laying a fluid transport pipe to be used for a waterworks gas, sewerage, etc., by a non open-cut method and to provide an earthquake resistant jacking pipe joint. SOLUTION: This pipe joint provided with a rubber ring sealing a clearance between a socket internal circumferential face and an insertion port outer circumferential face of a pipe, a presser ring pushing the rubber ring into the socket via a split ring, and a bolt/nut fastening the presser ring to the socket side, is provided with a lock ring in the internal circumferential face of the socket, an insertion port projection engaged with the lock ring and preventing the insertion port from being deviated in the insertion port tip part, and a flange opposed to the socket in the insertion port outer circumferential part. The jacking machine which is provided with a collar for transmitting a jacking force and being fractured after completing the jacking, and a pipe joint having the rear end abutting on the collar, the front end abutting on the socket end, and a rod part for transmitting the jacking force interposed therebetween, between the flange and the socket end, excavates and drives the underground while adding a pipe thereto using them. The collar is fractured after the jacking so that the machine can be contracted by the length of the collar when applying a contraction force by an earthquake, etc., thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion method for laying a pipe for fluid transport used for water supply, gas, sewerage and the like without cutting and a joint for a seismic propulsion pipe.

[0002]

2. Description of the Related Art Conventionally, as an embedding method for burying ductile cast iron pipes or the like, an open-cutting method in which the ground is cut and laid is generally used. However, in recent years, traffic volume has increased not only on main roads but also on general roads, and it has become difficult to cut off traffic due to excavation. For this reason, a propulsion construction method in which only the starting shaft and the reaching shaft are excavated, and the ductile cast iron pipe is sequentially propelled underground from the starting shaft to the reaching shaft and laid, has been widely adopted.

As a seismic joint which has been used in the above-mentioned propulsion method, there is a so-called US type joint for a propulsion method as shown in FIG. This US type fitting has an insertion port 101,
Inlet 102, exterior concrete 103, lock ring 1
05, rubber ring 106, split ring 107, push ring 108, connecting rod 110, set bolt 111, meandering prevention bolt 11
2, a flange 113, an insertion protrusion 115, and the like. A general propulsion method is, as shown in FIGS. 18A and 18B, a propulsion method This is a method of laying a pipe line without excavation up to the reaching shaft 202 while excavating with the leading pipe 205 while press-fitting the cast iron pipe 204.

In this joint, one of the pipes has a receiving port 10.
2 is formed, and an insertion port 101 to be inserted into the receiving port is formed in the other tube. Exterior concrete 103 is formed on the outer peripheral portion of the pipe used for the propulsion method so as to be equal to the outer diameter of the receiving port 102, so as to reduce resistance during propulsion due to bulging of the receiving port. I have. The method of joining the pipes is as follows.
The rubber ring 106 is inserted into the insertion opening 102 from the inner surface of the pipe, the split ring 107 and the pressing ring 108 are attached, the bolt 109 of the pressing ring is tightened, and the connecting rod 110 is attached. Finally, the set bolt 111 and the meandering prevention bolt 112 are tightened. According to this procedure, new pipes are successively joined to the rear of the new pipe to be drilled, and the flange 113 provided from the rear of the insertion port 101 and the receiving opening are formed. Propulsion is transmitted by the side end surface 114 of the part.

In a configuration such as the US joint for the propulsion method, when a certain or more pull-out force is applied during an earthquake, the meandering prevention bolt 112 is broken, and the insertion projection 115 and the side surfaces of the lock ring 105 are formed. Is engaged and insert 1
01 can be extended until it can be prevented, but if a force acts in a direction in which the insertion port 101 enters the receiving port 102, as shown in the figure at the time of completion of the propulsion work Since the flange 113 and the side end surface 114 of the receiving opening are in contact with each other,
1 does not move in the direction into the receptacle 102. For this reason, there is a problem that the joint only partially fulfills the performance as an earthquake-resistant pipe joint that requires expansion and contraction in both directions.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a propulsion method in which a fluid transport pipe used for water supply, gas, sewerage or the like is laid in a non-cutting state, with a sufficient amount of expansion and contraction at the time of an earthquake or the like. It is an object of the present invention to provide a propulsion method capable of burying pipes and a pipe joint having excellent seismic resistance.

[0007]

In order to solve the above problems, the present invention employs the following configuration. That is, the propulsion method according to the present invention is a propulsion method for burying underground while connecting pipes, and a collar capable of transmitting propulsion force between an insertion port and a receiving port of the pipe and capable of being crushed after embedding. And a plurality of rods between the collar and the port for transmitting propulsion from the collar to the port, and transmitting the propulsion to the port of the preceding pipe via the collar and the rod. While the propulsion is performed, after the propulsion is completed, the collar is crushed to make the insertion port and the receiving port contractable.

The pipe joint according to the present invention comprises a rubber ring for sealing a gap between an inner peripheral surface of a receiving port of the pipe and an outer peripheral surface of the insertion port, and a pressing ring for pushing the rubber ring into the receiving port via a split ring. In a pipe joint provided with a bolt and a nut for tightening the pressing ring on the receiving side, a lock ring is engaged with the inner peripheral surface of the receiving port, and a lock ring is engaged with a distal end of the insertion port to prevent the insertion port from deviating. Along with each of the insertion port projections to be provided, a flange facing the receiving port is provided on the outer peripheral portion of the insertion port, and between the flange and the receiving port end portion, a propulsive force transmitting collar that can be crushed after completion of propulsion, It is characterized in that a rod for transmitting a propulsive force is provided with a rear end abutting on the collar and a front end abutting on the receiving end.

As the above-mentioned collar for transmitting the propulsive force, for example, a lime-based material containing calcium oxide (CaO) as a main component, which expands by hydration in a concrete annular body, or 3CaO.3Al ₂ O _3. CaSO ₄ , C
It is conceivable to bury a static crushing agent containing a calcium-sulfo-aluminate (CSA) compound containing aSO ₄ and CaO as main components.

According to the present invention, the propulsion force can be transmitted to the preceding pipe through the propulsion transmission collar and the rod during the propulsion work. ,
Even when a pressing ring for pressing a rubber ring is attached to the end face of the receiving port with bolts and nuts, the driving force can be transmitted so as not to interfere with the pressing ring and the bolts and nuts. Further, after the propulsion is completed, by crushing the collar for transmitting the propulsion force, there is a margin for contraction by the amount of the collar at the fitting portion between the insertion port and the receiving port, and as a seismic joint, It has sufficient functions.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically based on embodiments of the present invention shown in the drawings.

FIGS. 1 and 2 show the structure of a pipe joint according to the present invention. This pipe joint J is an S-shaped joint usually used as a seismic joint for water supply. It consists of mouth 2. A ring-shaped projection 3 is integrally provided on the outer peripheral surface of the distal end portion of the insertion port 1. A flange 5 is integrally provided on an outer peripheral portion of the insertion port 1 on the rear side.
Reference numeral 6 denotes a backup reinforcing rib provided at an appropriate interval on the back surface of the flange 5. The flange 5 and the reinforcing rib 6 are made of metal and are fixed on the outer peripheral surface of the insertion port 1 by welding or the like.

A rubber ring mounting portion 10 and a lock ring groove 12 are provided on the inner surface of the receiving port 2. A rubber ring 13 for sealing is fitted in the rubber ring mounting portion 10, and a lock ring 15, which is spread out and made freely, is fitted in the lock ring groove 12. 14 is a backup ring, 18 is exterior concrete, and 19 is exterior lightweight steel pipe. The exterior lightweight steel pipe 19 is provided as needed, and may not be provided. A split ring 20 for pressing the rubber ring 13 and a pressing ring 21 for pressing the split ring are provided on the rear end surface of the receiving port 2. The pressing wheel 21 includes a plurality of bolts and nuts 2 attached at predetermined intervals along the circumference.
3 attached to the rear end face of the socket 2 and
By tightening the nut, the sealing rubber ring 13 is pressed via the split ring 20.

The flange 5 of the insertion port 1 and the pressing ring 2
A collar 25 serving as a propulsion force transmission member is interposed between the front and rear wheels 1, and a ring-shaped cushioning material 28 and a front flange 29 are provided on the front surface of the collar. The cushioning member 28 is a resin ring made of, for example, low-expanded polystyrene,
This is used to prevent the propulsion force from concentrating on one point during the curve propulsion method. This resin ring 2
Although 8 is shown in the figure as an integral body, it may be formed as a divided body and combined and integrated on site. In addition,
The front flange 29 is a metal ring and is provided on the front surface of the cushioning material 28 to reinforce the front surface of the cushioning material and to disperse a reaction force from a pin described later.

At the interval between the bolt and nut mounting portions of the pressing wheel 21, through holes 21a,... For inserting pins 30,. Metal pins (rods) 30 are loosely fitted. The rear end of the pin 30 is in contact with the front surface of the front flange 28, and the front end is the mounting hole 2 provided in the end face of the socket 2.
c. Therefore, the propulsive force transmitted from the insertion opening 1 to the collar 25 via the flange 5 is transmitted to the receiving opening 2 via the cushion member 28, the front flange 29, and the pins 30,. Since the length of the pin 30 is longer than the length of the bolt / nut 23 and the front flange 29 does not contact the bolt / nut, the propulsive force is not transmitted to the bolt / nut or the pressing ring 21. In addition,
In the illustrated example, the same number of pins 30 as the rods for transmitting the propulsion force are provided as many as the bolts and nuts 23, so that a large number of pins having a relatively large diameter can be provided. -It is possible to have more or less than the number of nuts.

As shown in FIG. 4, the propulsion force transmission collar 25 is formed as a ring-shaped integral body (a divided body is also possible), and is made of a material having moderate brittleness and rigidity, such as concrete and ceramics. Have been. This color 2
5 is provided with an insertion hole 26 penetrating back and forth at an appropriate interval (L) along the circumferential direction at an intermediate portion in the thickness direction thereof, and the insertion hole is filled with a static crushing agent 27. Have been. The relationship between the diameter d of the insertion hole and the hole interval L is, for example, L =
It is preferably about 8d.

The static crushing agent 27 is capable of crushing the collar after completion of the propulsion. This non-explosive demolition agents, and those of the lime mainly composed of calcium oxide _{(CaO), 3CaO · 3Al 2} O 3 · CaSO 4, Ca
There are two types: calcium-sulfo-aluminate (CSA) based on SO ₄ and CaO.

Lime-based CaO undergoes a hydration reaction to form fine colloidal calcium hydroxide Ca (OH).
Generate ₂ . This Ca (OH) ₂ grows into a long and anisotropic hexagonal plate-like crystal with the passage of time. This causes the crystal pressure to press against, and an inflation pressure to the constraint wall is generated. Also, in the case of the CSA type, since it grows into needle-like crystals called ettringite by a general hydration reaction as shown below, an expansion pressure to the constraining wall is generated similarly to the lime type. . These expansion pressures act on the filling hole, and compressive stress is generated in the peripheral portion around the hole, whereby tensile stress is generated in a direction perpendicular to this.

[0019]

Embedded image

A crack is generated when the tensile stress exceeds the tensile strength of the driving force transmitting collar, and furthermore, the expansion of the static crushing agent causes the propagation of the crack. For this reason, a large number of cracks are formed in the circumferential direction and the axial direction of the driving force transmitting collar, and crushing is performed. As described above, since the two types of main components, both of the lime type and the CSA type, have the effect of crushing the propulsion transmitting collar, either of the components may be used. Further, components other than these two types may be used as long as the object of the present invention is achieved. Fragments due to the crushing fall off between the insertion port 1 and the receiving port 2 and are removed, but since the compressive strength becomes 0 at the time of crushing, the joint can be contracted by that much.

The hydration reaction for crushing the collar for transmitting the propulsion force is performed, for example, by stirring the static crushing agent and water before the propulsion work and filling the static crushing agent into the static crushing agent insertion hole, without reacting with water. After the propulsion, it can be realized by a method of reacting with moisture contained in the soil of the ground around the pipe. When urgently required, water may be injected into this portion with a pipe or the like. The static crushing agent is a component similar to the swelling agent generally used for expanded concrete, and promotes crushing of concrete or the like by containing the swelling agent in excess. In addition, this static crushing agent is generally used for crushing rocks and concrete accompanying construction work, and can crush concrete and the like without generating vibration, noise, stepping stones, etc. Moreover, since it does not contain harmful components, no adverse effect on the tubular body is expected.

The insertion shape of the static crushing agent may be any shape other than the illustrated example as long as the purpose of crushing the propulsion transmitting collar and securing the amount of expansion and contraction of the joint can be achieved. . Also, as shown in the illustrated example, the color 2
The method is not limited to the method in which the static crushing agent is filled in the hole drilled in 5,
The collar itself may be made of concrete containing a static crushing agent as an admixture. In this case as well, after completion of the propulsion, a reaction can be caused by water contained in the soil around the pipe, and the pipe can be crushed by a method of securing the joint expansion and contraction amount.

The propulsion method using the above joint will be described as follows. First, as shown in FIG. 5, a driving force transmitting collar 25, a cushioning material 28, a front flange 29, a pressing ring 21, a split ring 20, a rubber ring 13, and a backup ring 14 are deposited in the outer peripheral portion of the insertion opening 1. On the other hand, the lock ring 15 is mounted in the lock ring groove 12 of the receiving port 2 in a state where the diameter thereof is enlarged, and the insertion port 1 is inserted into the receiving port 2. Then, after the insertion projection 3 has passed through the lock ring 15, the pin 30 is inserted into the mounting hole 2c of the receptacle 2 (see FIG. 6). Thereafter, the insertion port 1 is inserted into the receiving port 2 until the end of the pin 30 contacts the front flange 29, and the bolts and nuts 23 alternately mounted with the pins 30 are tightened.

In this way, pipes are sequentially inserted while excavating underground. FIG. 7 shows a cross section of the pipe joint at the time of this propulsion. The distance L ₁ is maintained between the distal end of the insertion port 1 and the rear end face 2 a of the receptacle 2, and the insertion port projection 3 and the lock ring 15 In the state where the distance L ₂ is maintained between the _two , the propulsive force is applied from the insertion port 1 of the following pipe to the socket 2 of the preceding pipe via the flange 5, the collar 25, the cushioning material 28, the front flange 29, and the pin 30. Is transmitted to

After the pipe is laid and a certain time has passed,
The collar 25 that has transmitted the propulsive force is statically crushed and spills from between the flange 5 and the end of the receiving port 2, so that the space between the flange 5 and the cushioning material 28 is substantially in a space state, and The insertion port 1 can be pushed in by the length.

When a strong compressive force acts on the pipe joint due to the occurrence of an earthquake after the installation, the distal end of the pin 30 can move toward the flange 5 by an amount corresponding to the absence of the collar 25. As shown in (2), the insertion port 1 is pushed in until it reaches the rear end face 2a of the receptacle 2. That is, the pipe joint is that there is only shrinkage allowance L ₁ in FIG.

On the other hand, when a pull-out force acts on the pipe joint due to an earthquake or the like, as shown in FIG. 9, the insertion port protrusion 3 is pulled out until it engages with the lock ring 15 (distance L ₂ ).
The engagement of the two prevents the insertion opening from being detached. For this reason, as stipulated in the National Land Development Technology Center “Technical Standards for Seismic Joints for Underground Pipes and Pipes” (draft), it is possible to provide a pull-out allowance of 1% or more of the pipe length,
The pushing allowance can be set to 1% or more of the pipe length.

Next, FIGS. 10 and 11 show an embodiment slightly different from the above. In this embodiment, between the front flange 29 and the end of the receiving port, that is, the split ring 20, the pressing ring 21, the bolt The outer peripheral portion of the space where the nut 23, the pin 30 and the like are provided is covered with the joint cover 40. The other points are the same as those of the above-described embodiment, and the same portions are denoted by the same symbols. In this embodiment, since the arrangement of the pressing wheel 21, the bolt / nut 23, the pin 30, and the like is covered with the joint cover 40, the inflow of earth and sand during the propulsion is prevented, and the outer peripheral surface of the pipe is smooth. In this state, it is possible to prevent an increase in propulsion. The joint cover 40 may be made of any material as long as the above object can be achieved, and may be made of, for example, resin or metal.

FIGS. 12 and 13 show still another embodiment, in which the rod (pin) 30 for transmitting the propulsive force is not inserted into the hole provided in the receiving port 2 and is held by the pressing wheel 21. The front end portion is in contact with the rear end surface of the receptacle 2.
Other parts are the same as above. According to this method, there is no need to process the end face of the receiving port 2, so that it is economical.

FIGS. 14 and 15 show still another embodiment. In this embodiment, the shape of the pressing wheel 21 is different from those of the other embodiments. That is, the pressing wheel 21 'in this embodiment is a rod (pin) 3 for transmitting the propulsion force.
The thickness of the portion of the hole through which 0 is inserted is increased. By doing so, the strength of the press wheel 21 is improved, so that the diameter of the rod (pin) 30 can be increased, and the safety of the water stopping performance can be further improved. It goes without saying that each of the above embodiments can be implemented alone or in combination with another embodiment.

FIG. 16 shows a different form of the static crushing agent inserted into the propulsion transmitting collar 25. In this embodiment, the static crushing agent 27 is obliquely inserted between the outer peripheral surface side and the inner peripheral surface side of the thick portion of the propulsion transmitting collar. For this reason,
The crushed concrete fragments will surely fall off, and the joint expansion and contraction amount can be more reliably secured.

In the above embodiment, the driving force transmitting collar 25 is crushed by a static crushing agent. However, the driving force transmitting collar 25 can transmit a sufficient driving force during propulsion. After the propulsion is completed, any material can be used as long as the material can be crushed to secure the amount of expansion and contraction of the joint. Should be provided. For example, a method is also conceivable in which a gas pipe (air hose or the like) is arranged to the position of the propulsion force transmitting collar, and after the propulsion is completed, the collar is blown off by compressed gas (air) or the like.

[0033]

As is apparent from the above description, according to the present invention, the propulsion force can be transmitted to the pipe joint used in the propulsion method, and the propulsion is crushed and removed from the joint after the propulsion is completed. Since the collar for transmitting the force was interposed, sufficient expansion and contraction was secured after burial, making it an extremely effective seismic joint. Further, since the driving force of the driving force transmitting collar is transmitted to the receiving end via a plurality of rods (pins), there is a pressing wheel, a bolt and a nut between the collar and the receiving end. Even with a joint having a structure, it is possible not only to transmit the propulsive force to the receiving port without applying a pushing force to the insertion port, but also to perform the propulsion without impairing the water stopping performance in the case of the S type joint. Now you can.
Furthermore, since the mechanism for ensuring the amount of expansion and contraction of the joint is provided on the outer surface of the pipe, even a pipe having a diameter of less than 800 mm, for example, in which an operator cannot enter the pipe, can be used as a seismic joint for a propulsion method. Also, since no function is added to the water contact portion on the inner surface of the pipe, the function of the existing pipe joint is not impaired.

[Brief description of the drawings]

FIG. 1 is a side view (a) of a pipe joint according to the present invention and FIG.
It is an arrow A view (b).

FIG. 2 is a sectional view taken along line BB in FIG. 1 (b).

FIG. 3 is a sectional view taken along the line CC in FIG. 1 (b).

FIG. 4 is a sectional view (a) and a front view (b) of a collar.

FIG. 5 is an explanatory diagram of a pipe joining method.

FIG. 6 is an explanatory diagram of a pipe joining method.

FIG. 7 is a cross-sectional view illustrating a state during propulsion.

FIG. 8 is a cross-sectional view illustrating a state in which a compressive force due to an earthquake has acted.

FIG. 9 is a cross-sectional view illustrating a state where a pull-out force due to an earthquake acts.

FIG. 10 is a side view (a) and an AA view (b) showing an embodiment different from the above.

11A is a sectional view taken along the line BB in FIG. 10B, and FIG.

FIG. 12 is a side view (a) and an AA arrow view (b) showing still another embodiment.

13A is a sectional view taken along line BB in FIG. 12B, and FIG. 13B is a sectional view taken along CC.

FIG. 14 is a side view (a) and an AA arrow view (b) showing still another embodiment.

15A is a sectional view taken along line BB in FIG. 15B, and FIG. 15B is a sectional view taken along line CC in FIG.

FIG. 16 is a sectional view (a) and a front view (b) showing a collar different from the above.

FIG. 17 is a cross-sectional view of a conventional US pipe fitting.

FIG. 18 is an explanatory diagram of a propulsion method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insertion opening 2 Reception opening 3 Insertion projection 5 Flange 13 Rubber ring 15 Lock ring 20 Split ring 21 Pressing ring 23 Bolt / Nut 25 Propulsion transmission collar 27 Static crushing agent 28 Buffer material 29 Front flange 30 Pin (rod) 40 Fitting cover

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Yoshinori Yoshida 1-12-19 Kitahorie, Nishi-ku, Osaka-shi, Osaka Inside Kurimoto Iron Works Co., Ltd. (72) Naoki Tomita 1-chome Kitahorie, Nishi-ku, Osaka, Osaka No. 12-19 Inside Kurimoto Iron Works Co., Ltd. (72) Inventor Takashi Ueda 1-12-19 Inside Kurimoto Iron Works Co., Ltd. Osaka City, Osaka Prefecture (72) Inventor 12 Shigekatsu Nishi-ku Kita, Osaka City Osaka Prefecture 1-12-19 Horie Inside the Kurimoto Iron Works Co., Ltd. F-term (reference) 2D054 AC18 AD28

Claims (8)

[Claims] 1. A propulsion method for burying underground while connecting pipes, wherein the collar is capable of transmitting propulsive force between an insertion port and a receiving port of the pipe and capable of being crushed after being buried, and A plurality of rods that transmit the propulsive force from the collar to the port between the port and the port are interposed, and while the propulsion force is transmitted to the port of the preceding pipe through the collar and the rod, the propulsion is performed. After the propulsion is completed, the collar is crushed to make the insertion port and the receiving port contractable. 2. A rubber ring for sealing a gap between an inner peripheral surface of a receiving port of a pipe and an outer peripheral surface of an insertion port, a pressing ring for pushing the rubber ring into the receiving port via a split ring, and tightening the pressing ring to the receiving port side. In a pipe joint provided with bolts and nuts, a lock ring is provided on the inner peripheral surface of the receiving port, and an insertion port projection is provided at the tip of the insertion port to engage with the lock ring to prevent the insertion port from deviating. A flange is provided on the outer periphery of the insertion port so as to face the socket, and a collar for transmitting a propulsive force that can be crushed after the end of propulsion and a rear end portion are provided between the flange and the end of the socket. A pipe joint characterized in that a rod for transmitting a propulsion force, which abuts and a front end thereof abuts on the receiving end, is interposed. 3. A lime based color containing calcium oxide (CaO) as a main component, or 3CaO.3Al ₂ O _3.
The pipe joint according to claim 2, wherein the pipe joint is formed of a brittle material containing CaSO ₄ , a calcium-sulfo-aluminate-based (CSA-based) compound containing CaSO ₄ and CaO as main components. 4. The collar is a concrete annular body.
Formed and mainly composed of calcium oxide (CaO)
Lime-based or 3CaO.3Al _Two O_Three ・ C
aSO_Four , CaSO_Four And CaO as the main component
Csium sulfo aluminate (CSA) compounds
3. A static crushing agent containing, for example, embedded therein.
The pipe joint according to 1. 5. The base of a rod for transmitting propulsion force is inserted into a hole provided at an end of a receiving port, and an intermediate portion of the rod is inserted into a through-hole provided in the pressing ring. 5. The pipe joint according to any one of 4. 6. The pipe joint according to claim 2, wherein a rod for transmitting a propulsive force is supported by said pressing ring, and a tip end thereof is in contact with a receiving end surface. 7. The pipe joint according to claim 2, wherein a portion of the push wheel through which the thrust transmitting rod is inserted is formed thicker than other portions. 8. The cylindrical joint cover according to claim 2, wherein a cylindrical joint cover for preventing inflow of earth and sand or the like is provided on an outer peripheral portion of a portion where the thrust transmitting rod is provided. Pipe fittings.