JP3916412B2 - Seismic pipe joint for propulsion method with propulsion jig - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic pipe joint for a propulsion method with a propulsion jig.
[0002]
[Prior art]
One type of pipe joint in which an insertion opening formed at the end of the other pipe is inserted into a receptacle formed at the end of one pipe is a so-called earthquake-resistant pipe joint.
[0003]
This is designed to prevent the insertion opening from being removed from the receiving opening and to allow expansion and contraction between the receiving openings within a certain range. As a pipe joint of such a seismic structure, for example, on the inner periphery of the receiving opening. Attach the lock ring and form a protrusion on the outer periphery of the insertion slot so that this protrusion engages with the lock ring from the back side of the receiving opening. An insertion tube is inserted and connected to the receiving opening at a distance from the back end of the receiving opening.
[0004]
With such a configuration, the insertion port can be inserted into the receiving port until the tip of the insertion port hits the back end of the receiving port, and the protruding portion of the insertion port is related to the lock ring of the receiving port. The insertion hole can be removed from the receptacle until it fits. That is, it has a certain range of expansion and contraction space.
[0005]
By the way, there is a propulsion method as a kind of pipe laying method. This is, for example, excavation of the start pit and the arrival mine from the ground surface at the first position on the laying path of the pipeline in the ground and the second position at a distance from the first position, A pipe line is laid by propelling the pipe body underground from the start pit toward the arrival mine. In the pipe for this propulsion method, the propulsive force in the pipe axis direction is transmitted between the receiving port in the pipe joint.
[0006]
For this reason, as a pipe joint used for a pipe for a propulsion method, for example, an insertion port formed with a flange on the outer surface is inserted into the receiving port, the flange is brought into contact with the receiving port opening end, and the insertion port and the receiving port There is something that can transmit propulsion between the two.
[0007]
[Problems to be solved by the invention]
When pipes are laid by the above-mentioned propulsion method, in the laying completion state, the flanges of the insertion ports are in contact with the receiving opening ends of all the pipe joints in the pipes laid from the propulsion mine to the reaching mine. It must be in a state.
[0008]
Therefore, in the pipe joint as described above, when the laying is completed, the tip of the insertion port is not in contact with the back end of the receiving port, and the protruding portion of the insertion port is not engaged with the lock ring of the receiving port, that is, the receiving port. It is impossible to place the insertion protrusion at the middle position between the back end of the mouth and the lock ring, and it is practically impossible to lay a pipe with the above-mentioned earthquake-resistant pipe joint by the propulsion method. There is a problem that it is.
[0009]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve such problems and enable a pipeline having an earthquake-resistant pipe joint to be laid by a propulsion method.
[0010]
[Means for Solving the Problems]
The seismic pipe joint for propulsion method with a propulsion jig according to the present invention is a pipe joint in which an insertion port is inserted into a receiving port while leaving a space for insertion between the distal end of the insertion port and the back end of the receiving port. A cylindrical body whose inner diameter is smaller than the outer diameter of the columnar body is fixed to the distal end of the columnar body whose diameter is reduced at the base end, the base end being fixed to the outer surface of the insertion opening toward the receiving opening end side. The cylindrical body is arranged such that the opening side of the cylindrical body is brought into contact with the outer peripheral surface of the body and the other end of the cylindrical body is brought into contact with the receiving opening end surface in a coaxial line. The distance from the front end of the columnar body to the other end of the cylindrical body is made longer than the pushing space, and the strength of the cylindrical body is increased by the diameter reduction portion at the front end of the columnar body under normal driving force. Although it does not open and deform, it has the strength to be expanded and deformed by the end of the columnar body for a large axial external force such as during an earthquake. It is made of is.
[0011]
According to this earthquake resistant pipe joint for propulsion method with a propulsion jig, the insertion tube is inserted into the receiving port by providing a pushing space corresponding to, for example, 1% of the tube length at the receiving end, and the outer surface of the insertion tube. A columnar body and a cylindrical body are inserted in a coaxial line between the end face and the receiving end face, and the propulsive force is transmitted by these. However, due to the strength of the cylindrical body, propulsion during the normal propulsion method Although it is propelled without being deformed by force, when an abnormal external force is applied after laying, such as during an earthquake, the columnar body bites into the cylindrical body, and as a result, the insertion port moves into the receiving port by the length of the space for pushing. It becomes possible and is given earthquake resistance.
[0012]
This cylindrical body is split from one end on the peripheral wall so that it can be opened and deformed if a certain level of force is applied, or it can be formed of a metal that is easily deformed, such as an aluminum alloy. good.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the earthquake-resistant pipe joint for a propulsion method with a propulsion jig according to the present invention will be described.
[0014]
1 is a cross-sectional view of a seismic pipe joint for a propulsion method with a propulsion jig according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view taken along the line XX of FIG.
In FIG. 1, 2 shows an insertion port, which constitutes one end of a tube 1a used in the propulsion method and is inserted into a receiving port 3 formed at the other end of another tube 1b.
[0015]
Between the outer surface of the insertion port 2 and the inner surface of the receiving port 3, a rubber band 4 for sealing is stored in a sealing rubber storage groove 4 a, and is formed on the outer periphery of the distal end 2 a of the insertion port 2 behind the rubber band 4 for sealing. A lock ring 6 that engages with the protrusion 2b to prevent the protrusion 2b is housed in the housing groove 5b via a centering rubber 5a.
[0016]
The insertion opening 2 is inserted at a substantially intermediate depth in the receiving opening 3, and a pushing space S is provided between the insertion tube distal end 2a and the receiving rear end 3a.
Reference numeral 9 denotes a columnar body, the distal end 9a is arranged in the direction of the receiving port 3, and the base end 9b is fixed to the flange 12 provided on the outer surface of the insertion port 2 by welding or the like. Further, as shown in FIG. 2, a plurality of the columnar bodies 9 are arranged at regular intervals in the circumferential direction.
[0017]
In the figure, reference numeral 13 denotes a stay that supports the flange.
Further, the tip 9a of the columnar body 9 is formed in a tapered shape so that the diameter of the tip is reduced as shown in an enlarged view in FIG.
[0018]
On the side of the tip 9a of the columnar body 9, there is a cylindrical body 10 that covers the tip 9a and whose inner diameter d is smaller than the outer diameter D of the columnar body 9, and is shown in an enlarged view in FIG. Thus, the cylindrical body 10 provided with the split 11 on the peripheral wall is arranged on the same axis.
[0019]
The other end of the cylindrical body 10 is brought into contact with the open end 3 b of the receiving port 3, and the thrust applied to the insertion port 2 in the axial direction is received from the flange 12 through the columnar body 9 and the cylindrical body 10. It is comprised so that it may be transmitted to the opening end 3b.
[0020]
The strength of the cylindrical body 10 is not deformed by a normal driving force when a driving force applied to the insertion opening is applied from the columnar body 9 to the cylindrical body 10, but the columnar body 10 has a large external force during an earthquake. It is set as the intensity | strength which the split 11 is expanded as shown in FIG.
[0021]
Next, the effect | action of the earthquake-resistant pipe joint for propulsion methods with a propulsion jig of this embodiment is demonstrated.
First, the base end portion 9b of the columnar body 9 is fixed to the flange 12 provided on the outer surface of the insertion opening 2 by welding or the like. Next, the cylindrical body 10 is attached to the tip of the columnar body 9 and is attached by fitting so as not to be easily detached using elasticity, or when not using elasticity, it is fixed by adhesion or the like.
[0022]
Next, the insertion port 2 is inserted into the receiving port 3 until the other end of the cylindrical body 10 comes into contact with the receiving port opening end 3b. At this time, a gap S is opened between the insertion end 2a and the receiving end 3a.
[0023]
In this state, when an axial propulsive force is applied to the tube 1a, the force is transmitted from the insertion port 2 to the flange 12, the columnar body 9, and the cylindrical body 10 to the opening end of the receiving port, but the strength of the cylindrical body 10 is normal propulsion. Since the strength is such that it does not deform at the level of force, the tube is propelled with the gap S provided.
[0024]
After laying the pipe, when a large external force is applied due to an earthquake or the like and a compressive force acts in the direction of the pipe axis, and the force is transmitted from the columnar body 9 to the cylindrical body 10, the force exceeds the strength of the cylindrical body 10 4, the cylindrical body 10 is enlarged and deformed by the split 11 as shown in FIG. 4 so that the insertion slot 2 is inserted into the receiving slot 3 and only the gap S can be inserted, and an excessive compressive force is applied to the joint portion. Concentration is prevented.
[0025]
In addition, when a force in the pulling direction is applied, one end of the cylindrical body 10 is merely in contact with the receiving opening 3b, so there is no resistance in the separating direction. Movement in the pull-out direction until 2b comes into contact with the lock ring 6 is allowed.
[0026]
Therefore, according to the earthquake-resistant pipe joint for propulsion method with the propulsion jig, the pipe can be laid in a state where the joint portion of the propulsion pipe has a margin for movement in the reduction direction and the extension direction. Further, since the columnar body 9 and the cylindrical body 10 for providing the pushing-in space S are attached to the outer surface of the pipe, there is no problem even if it is left as it is after laying the pipe.
[0027]
【The invention's effect】
As explained above, according to the seismic tube joint for propulsion method with a propulsion jig of the present invention, when propelling in the soil or propelling the pipe by the sheath tube method, A space for earthquake resistance can be provided between the rear end of the receiving port and propelled.
[Brief description of the drawings]
FIG. 1 is a side view of a seismic pipe joint for a propulsion method with a propulsion jig according to an embodiment of the present invention.
2 is a cross-sectional view taken along line XX of FIG.
3A and 3B are explanatory diagrams of a columnar body and a cylindrical body in a seismic tube joint for a propulsion method with a propulsion jig according to an embodiment of the present invention, wherein FIG. 3A is a front view of the columnar body, FIG. c) is a front view of the cylindrical body, and (d) is a side view thereof.
FIG. 4 is an operation explanatory view of a seismic tube joint for a propulsion method with a propulsion jig, and is a cross-sectional view showing a shrinkage change of the joint portion.
[Explanation of symbols]
1a Inlet side tube 1b Inlet side tube 2 Inlet 3 Inlet 4 Sealing rubber ring 6 Lock ring 9 Columnar body 10 Cylindrical body 11

Claims (1)

In a pipe joint in which an insertion port is inserted into the receiving port while leaving a space for pressing between the distal end of the insertion port and the back end of the receiving port, the distal end is directed to the receiving port opening end side and the proximal end is directed to the outer surface of the insertion port. The cylindrical body whose inner diameter is smaller than the outer diameter of the columnar body is placed at the distal end of the fixed columnar body whose diameter is reduced, and the opening side of the cylindrical body is abutted against the outer peripheral surface of the columnar body. It is arranged so that the other end of the cylindrical body abuts on the end surface of the opening of the receiving port as a coaxial line, and from the tip of the columnar body in contact with the cylindrical body to the other end of the cylindrical body The distance is made longer than the space for pushing, and the strength of the cylindrical body is not expanded and deformed by the reduced diameter part of the tip of the columnar body with a normal driving force, but against a large axial external force such as during an earthquake. An anti-seismic pipe joint for a propulsion method with a propulsion jig, which has a strength that is expanded and deformed by the tip of the columnar body.

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