JPH0942552A - Connecting structure and method of propelling pipe and manhole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give an extending and contracting function to a connection, by compressing a seal member between an inner flange formed at the other end of a sleeve whose one end is installed to a manhole wall and the outer surface of a propelling pipe, and composing the inner flange and the propelling pipe to engage each other. SOLUTION: A advancing shaft 12 of a manhole structure is excavated, a concrete wall 13 is placed, and a sheath pipe 22 is inserted. A circular space 24 is formed between the sheath pipe 22 and a propelling pipe 15, and a sleeve 25 is inserted. One end of the sleeve 25 is fixed to the wall 13, and an inner flange 33 is formed to the other end. The inner circumference of the inner flange 33 is made in a taper form seal pressure contant surface 34, and a seal member 35 is compressed between the outer peripheral surface of the propelling pipe 15. And a push ring 36 to push the end face of the seal member 35 is provided, and it is compressed by a push plate 39 installed to the inner flange 33. Furthermore, a circular body 43 is provided at the front end side of the propelling pipe 15 from the push plate 39, to which the lock ring 20 of the propelling pipe 15 is engaged so as to play a removal preventive role.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure and method for connecting a propulsion pipe and a manhole.

[0002]

2. Description of the Related Art In a propulsion method in which a pipe is laid by propelling a pipe into the ground, a manhole-structured starting pit and reaching pit are excavated from the surface of the ground, and the starting pit is directed toward the reaching pit. The tube is being propelled. After the propulsion work, in the starting pit and the reaching pit, it is common to firmly connect the pipe body to the concrete wall forming the manhole.

[0003]

However, simply connecting the pipe body to the concrete wall in such a manner does not give the expansion / contraction function to the connection portion, and therefore, when an earthquake or the like occurs, the follow-up is not performed. However, there is a problem in that it is impossible to do so, and unreasonable force is easily applied to the connecting portion.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve such a problem and to allow a connecting portion to have a stretching function.

[0005]

In order to achieve this object, according to the present invention, a sleeve is fitted on the outer periphery of a propulsion pipe at a position of a wall portion constituting a manhole, and one end side of the sleeve is attached to the wall portion. An inner flange is formed on the other end side of the sleeve, and a seal member is arranged between the seal member pressure contact surface formed on the inner circumference of the inner flange and the outer peripheral surface of the propulsion pipe,
Provided between the propulsion pipe and the sleeve on the end side of the propulsion pipe with respect to the inner flange is means for compressing the sealing material between the press contact surface and the outer peripheral surface of the propulsion pipe by being fastened to the inner flange. , Between the propulsion pipe and the sleeve on the end side of the propulsion pipe with respect to the compression means, an annular body that is in contact with the end face of the inner flange is provided, and on the outer periphery on the end side of the propulsion pipe,
It is equipped with a lock ring that can engage with an annular body.

With such a structure, the propulsion pipe and the sleeve at the position of the wall portion forming the manhole are merely supported by the sealing material in a sealed state, and are freely moved relative to each other in the axial direction. Because it is possible
The expansion / contraction function is thereby given. Further, since the lock ring engages with the end surface of the inner flange of the sleeve through the annular body, a disengagement preventing function is imparted.

Further, according to the present invention, after propelling the propulsion pipe and burying it in the soil, the sediment around the propulsion pipe in the vicinity of the manhole to which the propulsion pipe is to be connected is removed, and the propulsion pipe is predetermined in the manhole. Cut into length, perform groove processing on the outer periphery of the end of this propulsion pipe, and fit the sleeve to the outer periphery of the propulsion pipe in the portion where the earth and sand are removed,
One end of this sleeve is attached to the wall of the manhole, and the sealing material between the seal material pressure contact surface of the inner flange formed on the other end side of this sleeve and the outer peripheral surface of the propulsion pipe is driven more than the inner flange. The propulsion pipe and the sleeve on the end side of the pipe are compressed by the compression means which is provided between the propulsion pipe and the sleeve and which is fastened to the inner flange. An annular body that is in contact with the end face of the inner flange is inserted therebetween, and a lock ring that can engage with the annular body is mounted in a groove formed on the outer periphery of the end portion side of the propulsion pipe.

In this way, not only the expansion and contraction function and the separation prevention function are similarly given, but also the required connection structure can be obtained only by the work in the manhole.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the case of laying a pipeline by a propulsion method, as shown in FIG. 4, a starting hole 12 having a manhole structure is excavated from the ground surface 11 and a concrete wall 13 constituting this starting hole 12 is cut. To place. Then, the original push jack 14 is arranged inside the starting pit 12, and the original push jack 14
Then, the propelling pipe 15 is propelled into the ground, and if one pipe 15 is propelled into the ground, the next propelling pipe 15 is added in the starting pit 12 and the same propulsion is performed, and this work is repeated. Exterior concrete is formed on the outer periphery of the propulsion pipe 15. 16 is a leading conduit. The concrete wall 13 is formed with a hole 17 for propelling the propulsion pipe 15.

When all the propulsion pipes 15 to form the pipeline have been laid, the concrete wall 13 of the starting shaft 12 and the final propulsion pipe are connected. FIG. 1 shows the connection structure. That is, the last propelling pipe 15 is configured such that the outer concrete is not formed, and after the propulsion work is finished, it is cut off at a position slightly inside the starting pit 12 rather than the concrete wall 13. 18 is the cutting tube part. An annular groove 19 is formed on the outer periphery of the propulsion pipe 15 near the cutting pipe portion 18.
19 is a lock ring 20 with a tight split in the circumferential direction
Is installed.

A sheath pipe 22 is inserted from the hole 17 of the concrete wall 13 toward the soil. The sheath pipe 22 is formed of a thin-walled pipe, has a diameter larger than that of the above-mentioned exterior concrete, and has a small flange 23 that engages with the peripheral edge of the hole 17.
have.

A sleeve 25 is provided in an annular space 24 formed by removing soil between the sheath pipe 22 and the propulsion pipe 15.
Is inserted. The sleeve 25 has a flange 26 located on the inner side of the starting shaft 12 than the small flange 23 of the sheath tube 22.
Has at one end. The flange 26 has a diameter larger than that of the small flange 23 of the sheath tube 22, and has a plurality of bolt holes 27 in the circumferential direction. Then, the sleeve 25 is fixed to the concrete wall 13 by inserting the anchor bolt 28 in the pipe axis direction implanted in the concrete wall 13 through the bolt hole 27 and tightening it with the nut 29. Flange 26 on the inner side of the bolt hole 27
An annular protrusion 30 is formed on the end face of the pipe axial direction, and when the flange 26 is fixed with the bolt 28 and the nut 29, an annular seal material is formed between the annular protrusion 30 and the concrete wall 13.
The periphery of the hole 17 can be sealed by compressing 31.

An inner flange 33 is formed on the other end side of the sleeve 25 located in the inner part of the annular space 24.
A tapered seal member pressure contact surface 34 facing the tip side of the propulsion pipe 15 is formed on the inner periphery of the. This seal material pressure contact surface 34
A rubber-made annular seal member 35 is arranged between and the outer peripheral surface of the propulsion pipe 15. An annular push ring 36 is arranged in contact with the end surface of the sealing material 35.

As shown in FIGS. 1 to 3, fastening bolts 38 in the pipe axial direction are implanted at a plurality of circumferential positions on the end surface 37 of the inner flange 33 facing the tip of the propulsion pipe 15. There is. The fastening bolt 38 will be located between the propulsion pipe 15 and the sleeve 25. A fan plate-shaped push plate 39 is externally fitted to each fastening bolt 38, and the push plate 39 has a step portion 40 that engages with the push wheel 36. Therefore, by pushing the pressing plate 39 into the fastening bolt 38 in this manner and screwing the nut 41 into the fastening bolt 38, the sealing member 35 is propelled to the pressure contact surface 34 via the pressing plate 39 and the push ring 36. It can be compressed with the outer peripheral surface of the tube 15. This seals between the sleeve 25 and the propulsion tube 15.

Further, between the propulsion pipe 15 and the sleeve 25,
An annular body 43 is provided. The annular body 43 has an annular main body portion 44, and the main body portion 44 is more propulsive than the push plate 39.
Is arranged at a position on the tip side of. Notches 45 for escaping the fastening bolt 38 and the nut 41 screwed to the fastening bolt 38 are formed in the main body portion 44 at a plurality of positions in the circumferential direction corresponding to the fastening bolt 38. Further, the annular body 43 integrally has a plurality of leg portions 46 that extend in the tube axis direction between the fastening bolts 38 adjacent to each other.
The tip of 46 is configured to contact the end surface 37 of the inner flange 33 of the sleeve 25. In the illustrated state, the lock ring 20 is located at a predetermined distance from the annular body 43.

The connection work between the last propelling pipe 15 and the concrete wall 13 is performed as follows. That is,
Once the last propulsion pipe 15 has been laid as described above,
Inside the 12, the sheath pipe 22 is fitted to the end of the propulsion pipe 15, and then the sheath pipe 22 is inserted into the hole of the concrete wall 13.
Insert from 17 into the soil. And this sheath tube 22 and propulsion tube
An annular space 24 is formed by removing sediment between 15 and.

On the other hand, the propulsion pipe 15 is cut by the cutting pipe portion 18 and the annular groove 19 is processed. When cutting these cut tubes and grooves, it is possible to easily work even inside the narrow starting pit 12.

Next, the sleeve in which the fastening bolt 38 is implanted
25 is put on the outside of the propulsion pipe 15 and inserted into the annular space 24. Then, by screwing the nut 29 onto the anchor bolt 28, the flange 26 is fixed to the concrete wall 13, and the sealing material 31 is compressed by the annular projection 30. At this time, a gap is created between the flange 26 and the concrete wall 13 due to the existence of the annular projection 30 and the sealing material 31, and the small flange 23 of the sheath pipe 22 is accommodated in this gap.

After that, the seal material 35 and the push ring 36 are externally fitted to the propulsion pipe 15, the seal material 35 is pushed in the vicinity of the pressure contact surface 34, and the push ring 36 is brought close to the seal material 35 in that state. After that, the fastening plates 38 are fitted to the fastening bolts 38 so that the fastening bolts 38 penetrate the pushing plate 39,
Screw the nut 41 onto the fastening bolt 38. Then, the nut 41 pushes the push ring 36 through the push plate 39, and the seal ring 35 is pushed by the push ring 36, so that the seal ring 35 is pressed between the pressure contact surface 34 and the outer peripheral surface of the propulsion pipe 15. It is compressed by and achieves the required sealing function.

In addition, the annular body 43 is fitted on the propulsion pipe 15 by
The notch 45 is made to correspond to the fastening bolt 38 and the nut 41, and the leg portion 46 thereof is brought into contact with the end surface 37 of the inner flange 33 and arranged at a predetermined position. Note that it is preferable to hold the annular body 43 in such a state of being arranged at the predetermined position by some means. And finally the annular groove 19
By attaching the lock ring 20 to the, the connecting work is completed as shown in the figure.

According to such a structure, the propulsion pipe 15 and the sleeve 25 are merely supported by the seal member 35 in a sealed state, and can freely move relative to each other in the axial direction. Further, in the state where the connecting work is completed, the lock ring 20 is located at a predetermined distance from the annular body 43. Therefore, the expansion / contraction function is provided between the propulsion pipe 15 and the sleeve 25.

In this case, the sleeve 25 and the propulsion pipe 15
When a pull-out force is applied between the lock ring and
By engaging 20 with the main body portion 44 of the annular body 43 and contacting the leg portion 46 of the annular body 43 with the end surface 37 of the inner flange 33, a required separation prevention function is provided. At this time, the withdrawal force is transmitted through the annular body 43, and the withdrawal force does not act on the push plate 39 and the push ring 36, so that the sealing member 35 is prevented from being adversely affected by the withdrawal force.

Since the sleeve 25 and the propulsion pipe 15 are only mutually supported by the sealing material 35, the sealing material
It is also possible to impart a bending function between the sleeve 25 and the propulsion pipe 15 by appropriately setting the inner diameter of each member in the portion where the 35 is arranged.

By providing the expansion / contraction function, the separation prevention function, and the bending function in this way, it is possible to properly follow up when an earthquake or ground subsidence occurs, and therefore the propulsion pipe 15
It is possible to prevent unreasonable force from being applied between the sleeve 25 and the concrete wall 13.

Further, since the sleeve 25 is inserted into the annular space 24 and fixed by the anchor bolts 28 and then the sealing material 35 is compressed, the sleeve 25 itself should be inserted by using a special power unit. Can be easily done without.

In the above description, the starting pit 12 is taken as an example, but the reaching pit can also be provided with the expansion / contraction function, the separation prevention function, and the bending function.

[0027]

As described above, according to the connection structure of the present invention, one end side of the sleeve fitted on the outer periphery of the propulsion pipe is attached to the wall portion forming the manhole, and the other end side of the sleeve is attached. An end portion of the propulsion pipe rather than a means for compressing the seal material by arranging the seal material between the seal material pressure contact surface on the inner periphery of the formed inner flange and the outer peripheral surface of the propulsion pipe. On the side, an annular body in contact with the end face of the inner flange was provided, and a lock ring that could engage with the annular body was attached to the outer circumference on the end side of the propulsion pipe, so that the connecting portion of the propulsion pipe to the manhole has an expansion and contraction function. A separation prevention function can be added.

Further, according to the connecting method of the present invention, the required connecting structure can be obtained only by the work in the manhole.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of a connection structure between a propulsion pipe and a manhole according to the present invention.

FIG. 2 is a cross-sectional view of the main part of the portion shown in FIG.

3 is a vertical cross-sectional view of another portion of the connection structure of FIG.

FIG. 4 is a schematic diagram for explaining a propulsion method.

[Explanation of symbols]

 12 Start pit 13 Concrete wall 15 Propulsion pipe 20 Lock ring 25 Sleeve 33 Inner flange 35 Sealing material 36 Push ring 38 Fastening bolt 43 Annular body

Claims (2)

[Claims] 1. A connection structure between a propulsion pipe and a manhole to which the propulsion pipe is connected, wherein a sleeve is fitted around the outer periphery of the propulsion pipe at a position of a wall forming the manhole, and one end side of the sleeve is attached. The inner flange is formed on the other end of the sleeve by being attached to the wall portion, and the seal material is arranged between the seal material pressure contact surface formed on the inner circumference of the inner flange and the outer peripheral surface of the propulsion pipe. A means for compressing the sealing material between the press contact surface and the outer peripheral surface of the propulsion pipe by being fastened to the inner flange is provided between the propulsion pipe and the sleeve on the end side of the propulsion pipe, An annular body that is in contact with the end face of the inner flange is provided between the propulsion pipe and the sleeve on the end side of the propulsion pipe with respect to the compression means, and a lock that can engage with the annular body on the outer periphery of the end side of the propulsion pipe. Specially equipped with a ring The connecting structure between the propulsion pipe and the manhole. 2. After propelling the propulsion pipe and burying it in the soil, the sediment around the propulsion pipe in the vicinity of the manhole to which the propulsion pipe is to be connected is removed, and the propulsion pipe is made to have a predetermined length in the manhole. Cut, perform groove processing on the outer periphery of the end of this propulsion pipe, fit the sleeve to the outer periphery of the propulsion pipe in the portion where the earth and sand have been removed, and attach one end side of this sleeve to the wall of the manhole,
The sealing material between the sealing material pressure contact surface of the inner flange formed on the other end side of the sleeve and the outer peripheral surface of the propulsion tube is provided between the propulsion tube and the sleeve on the end side of the propulsion tube with respect to the inner flange. Is compressed by the compression means provided on the inner flange and is fastened to the inner flange, and an annular body in contact with the end face of the inner flange is inserted between the thrust tube and the sleeve on the end side of the thrust tube with respect to the compression means. A method for connecting a propulsion pipe and a manhole, wherein a lock ring capable of engaging with the annular body is attached to a groove formed on the outer periphery of the propulsion pipe on the end side.