JP4080773B2 - Pipe guide used for in-pipe insertion method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe guide for use in a pipe insertion method (pipe-in-pipe method ) in which a pipe for transporting fluid used for water supply, gas, sewerage, etc. is laid without opening.
[0002]
[Prior art]
As a method of embedding fluid transport pipes such as ductile cast iron pipes, the open-cut method of excavating and laying the ground has been common, but nowadays traffic volume has increased not only on main roads but also on general roads. Therefore, it is difficult to block traffic due to the open-cut method. For this reason, only the starting pit and the drilling pit are excavated, and a ducted iron pipe is inserted after a fume pipe or steel pipe is propelled and buried as a sheath pipe (sheath pipe). In-pipe insertion methods such as pipe-in-pipe method, in which a new pipe with a small diameter is inserted to renew the pipe line, have come to be widely adopted.
[0003]
In the pipe-in-pipe method, as shown in FIG. 19, a new pipe P having a smaller diameter is inserted and laid in an existing pipe P ′ buried between the start pit S and the arrival pit R. A hydraulic jack J is installed in the start pit S. The rear portion of the hydraulic jack J abuts against the reaction force receiver H, and the front portion presses the new pipe P in the direction of the pipe axis through the push angle B. ing. The new pipe P is sequentially joined by inserting the insertion port 1 at the tip end thereof into the receiving port 2 at the rear end part of the preceding new pipe P, and is pushed into the existing pipe P ′. At this time, the pipe guides 20 and 20 ′ are attached to each new pipe P, and a leading sled K for reducing the insertion shaft is attached to the tip of the frontmost new pipe P. For details of the tube guides 20 and 20 ', refer to the examples described later.
[0004]
[Problems to be solved by the invention]
In this in-pipe insertion method, as shown in FIG. 20 (a), the pipe guide 20 is attached from the opening of the sheath pipe P 'to the extension L of the foremost (leading) new pipe P in the access pit R. If the distance to the position is large, the pipe guide 20 is in the sheath pipe P ′, and the new pipe P does not tilt. However, if the distance is small as shown in FIG. The guide 20 falls out of the sheath tube P ′, and the leading new tube P falls from the sheath and tube P ′ like the chain line due to its own weight and tilts downward. This also adversely affects the bending degree (joining degree) of the joint portion with the (following) new pipe P.
[0005]
For this reason, when there is a possibility that the leading new pipe P may be tilted downward, conventionally, as indicated by the hatched arrow in the figure, measures such as suspending the insertion opening of the leading new pipe P with a crane or the like are taken. This measure is cumbersome and causes a decrease in workability.
[0006]
In order to prevent such a situation from occurring, when the leading new pipe P reaches the arrival shaft R, the mounting position of the pipe guide 20 is determined in advance so that the state shown in FIG. However, in order to determine the attachment position, work time such as distance measurement to the arrival mine is required on the start pit S side, and a situation where a plurality of pipe guides 20 must be attached also occurs. . In addition, the position of the pipe guide 20 attached to the leading new pipe P cannot be changed in the middle of the propulsion (in the sheath pipe P). When a change occurs in the outgoing balance L of P and the situation shown in FIG. 20B is reached, time must be taken for the response. By the way, it is conceivable to change the mounting position of the pipe guide 20 when the leading new pipe P reaches the arrival pit R. However, the pipe guide 20 is generally firmly fixed by bolts and nuts. It is fastened and fixed, and its removal is not easy. For this reason, the attachment position change after attachment of the tube guide 20 is hardly made.
[0007]
In view of the above circumstances, the present invention is capable of easily changing the position of the pipe guide of the leading new pipe without hindering its guiding action, and smoothly obtaining the allowance in the reaching mine. Is an issue.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a pipe guide for the leading new pipe, which has a fixing force with the new pipe to the extent that the propulsion is not hindered during propulsion. It was designed to be movable with respect to the tube. When adjusting the projecting length (protrusion allowance L) of the leading new pipe to reach the new pipe, by making the pipe guide movable with respect to the new pipe, if the pipe guide does not move as the new pipe is propelled, If the pipe guide stops at the position in the sheath and guides the new tube and does not fall out of the sheath, and there is a risk of moving, it will not fall out of the sheath by blocking the movement. .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Is a tube inserted engineering method using a tube guide member according to the present invention, when inserting laying new tube sheath tube which is embedded between the starting pit and the arrival mine, in the starting pit, preceding the new tube Insert the insertion port of the backward new tube into the receiving port of the tube and push the backward new tube in the direction of the tube axis while joining them together, and the pipe guide attached to each new tube In the in-pipe insertion method in which the pipe is propelled into the sheath pipe through the caster of the tool, when the leading new pipe of each joined new pipe reaches the reaching pit, the pipe guide of the leading new pipe When the tool is movable with respect to the new pipe and the protrusion length of the earliest new pipe in the arrival pit is adjusted, the pipe guide tool does not move relative to the newest new pipe so that it will not fall off the sheath pipe. Adopt the configuration to make.
[0010]
If comprised in this way, a new pipe will protrude from an arrival mine by the allowance, with a pipe guide remaining in a sheath pipe. In this configuration, it is preferable not to move the pipe guide reliably as the new pipe is propelled. As the means, the caster can be locked, or the end face of the sheath pipe that opens to the access pit can be angled. For example, a member such as a stick is applied to abut the tube guide to prevent its movement.
[0011]
As an embodiment of the invention related to the pipe guide used in the pipe insertion method, an annular saddle fitted into the new pipe and a sheath pipe inner surface rolling caster provided around the saddle, the saddle is It is possible to adopt a configuration in which the new tube can be moved in the tube axis direction via a roller and can be fixed at an arbitrary moving position.
[0012]
In this configuration, the saddle (pipe guide) is fixed to the new pipe by making the roller blockable to prevent rotation, allowing the saddle to be moved and fixed, or threading a rotation prevention screw around the saddle, A configuration is adopted in which the saddle is fixed to the new pipe by pressing it against the outer peripheral surface of the new pipe.
[0013]
【Example】
An embodiment is shown in FIGS. 1 to 10, and this embodiment relates to a construction method in which ductile cast iron new pipes P are joined together and promoted with an S-type joint structure, and the joint portion is shown in FIGS. As shown, after the protrusion 3 is provided at the tip of the insertion port 1 and the lock ring 5 is provided on the inner surface of the receiving port 2, the insertion port 1 is inserted into the receiving port 2 with the rubber ring 6 and the backup ring 6 a interposed therebetween. The rubber ring 6 is pushed in and sealed by applying the push ring 9 to the rubber ring 6 through the split ring 9a and screwing the stud bolt 12 into the receiving port 2 through the push ring 9.
[0014]
An annular tube guide 20 ′, which will be described later, is fitted on the outer periphery of the insertion port 1 outside the receiving port 2. A protective ring 13 is interposed between the tube guide 20 ′ and the stud bolt 12 (the end surface of the receiving port 2). The propulsive force transmission material 14 is provided. The propulsive force transmission member 14 has an annular shape, but may be divided in the circumferential direction, and may be intermittent. In short, it is sufficient to have strength against driving force. Further, a pipe guide 20 having substantially the same configuration as the pipe guide 20 ′ is attached to the leading new pipe P.
[0015]
These tube guides 20 and 20 'are made of a material such as FCD or SS, and are divided into four equal parts with an L-shaped cross section as shown in FIG. Fastening piece 22 is provided in the middle, and rib 23 is provided in the middle. A caster 24 is rotatably provided between the fastening pieces 22 and 22 of the adjacent divided pieces 21 and 21, and a bolt / nut 25 is inserted. By fastening the bolt / nut 25, a joint is obtained. The pipe guide 20 ′ is reduced in diameter and is pressed against the outer peripheral surface of the insertion port 1. The number and position of the casters 24 are arbitrary in the circumferential direction of the tube and the tube axis direction. A stud is provided on the pressure contact surface of the pipe guide 20 ′ of the joint, and the shape may be a pyramid shape such as a triangular pyramid shape, a conical shape, a prism, a cylinder, etc. A conical shape is preferred. The length and number of studs are not particularly limited. Moreover, it may replace with a stud and may arrange | position an edge in the circumferential direction of the inner surface of the division | segmentation piece 21. FIG. The length of the edge is equal to or less than the inner peripheral length of the divided piece 21 and may be continuous or divided into several portions, and is arranged in at least one row on the inner surface.
[0016]
Holes 26 are formed at two locations in the split piece 21 of the pipe guide 20 of the leading new pipe P, and a U-shaped roller receiving base 27 is provided so as to surround the hole 26. The positions and the number of the holes 26 are arbitrary, but it is preferable that the holes 26 have an equal interval around the new pipe P. A roller 28 is rotatably attached to the roller support 27 via bolts and nuts 29, and the roller 28 protrudes from the inner surface of the divided piece 21. The roller 28 may be any material as long as it can withstand loads such as FCD and SS, and a plurality of rollers 28 may be provided in the tube axis direction of the cradle 27. The shaft of the roller 28 is not limited to the bolt / nut 29, and may be any rod-like material made of a material such as SS, FCD, or SUS as long as it can withstand the load. The bolt and nut 29 can be the same as the bolt and nut 25 of the caster 24 portion.
[0017]
The roller 28 is provided with an anti-rotation tool 30. The anti-rotation tool 30 includes a main body 31 provided with a friction plate 31a such as a surface resin lining or a rubber lining on the front surface, and a stopper provided on the main body 31 so as to be rotatable. As shown in FIG. 6, the set screw 32 is threaded through the receiving base 27, and as shown in FIG. As shown in FIG. 4B, when the set screw 32 is rotated in the reverse direction, the main body 31 is separated from the roller 28 and the roller 28 can be rotated. Instead of the friction plate 31a, a friction lining may be applied to the main body 31, or a friction force may be applied by forming a groove. This friction treatment can also be performed on the surface of the roller 28. Between the shaft (bolt / nut) 29 and the roller 28, a bearing can be interposed to facilitate rotation.
[0018]
As a means for preventing the rotation of the roller 28, as shown in FIG. 12, a screw 33 threaded through the receiving base 27 is inserted into the hole 28a of the roller 28, or as shown in FIG. It is also possible to employ a method in which the bolt 34 is threaded through the position, the bolt 34 is pressed against the new pipe P, and the pipe guide 20 is integrated with the new pipe P. The number of the bolts 34 is arbitrary, but the bolts 34 are arranged around the new pipe P. Further, if the screw 28 has a screw hole 28a in the roller 28, the screw 33 may be penetrated without being screwed into the cradle 27, and may be a pin if it is fixed to the cradle 27 by some means. The position of the screw 33 or the like is arbitrary such as parallel to the axis 29.
[0019]
The propulsive force transmission material 14 is, for example, a high-strength resin foam having a compressive stress of 1 to 30 kgf / cm ² (≈0.1 to 3 MPa) (expansion coefficient more than 5 times that of a single resin) and a foaming ratio of By changing, the elastic limit stress changes. Examples of these materials include polystyrene, polyurethane shown in JP 2000-17987 A, concrete containing a static crushing agent shown in JP 2000-80889 A, and foamed materials thereof. Representative. Of course, other resin materials or hard paper such as corrugated cardboard, foam metal, etc. having the desired transmission of propulsive force and contractibility may be used. In addition, a resin container filled with a liquid or gas can be an effective means.
[0020]
Since these propulsive force transmission members 14 are elastically deformed by a compressive force that is about the propulsive force during construction, the propulsive force is transmitted, but no distortion remains, and the propulsive force is removed (propulsion is completed). To restore). On the other hand, when a compressive force greater than the elastic limit stress is applied, the amount of strain increases in the plastic region, and when a compressive force greater than a certain level is applied, the progress of strain is maintained with a predetermined thickness remaining. Stop (refer to each of the above publications for details).
[0021]
The configuration of this embodiment is as described above. In the propulsion method shown in FIG. 19, the leading new pipe guide 20 is attached to the insertion opening 1 side of the leading new pipe P as shown in FIG. The tube guide 20 is immovable with respect to the new tube P as shown in FIG. On the other hand, in order to insert the insertion port 1 of the succeeding new tube P into the receiving port 2 of the leading new tube P and join the new tubes P and P, first, as shown in FIG. At this time, the insertion amount of the insertion slot 1 is shortened, and the body size L is lengthened. Further, the protective ring 13 or the like is inserted into the opening 1. In this state, joint joining is performed according to a normal procedure ((b) in the figure).
[0022]
Next, the protection ring 13 is shifted to a position where it hits the head of the bolt 12, the two-way propulsive force transmission member 14 is attached in a ring shape, and a pipe guide 20 'is further fitted and fastened (from FIG. 3 (c)). (D)). In this state, when a propulsive force is applied with a jack, the insertion slot 1 is inserted to the position of the specified body-attached dimension L ₁ ((d) in the figure), and the propulsion is propelled in this state. This propulsion is effective for long-distance propulsion where there is a concern about rolling because the new pipe P can be supported by any of the casters 24 even if rolling occurs, and the propulsive force can be prevented from becoming excessive. In this propulsion, because the new pipe P moves through the caster 24 in the sheath pipe P ′, the roll guide of the roller 28 shown in FIG. Will not move.
[0023]
As the new pipe P is laid down, the leading new pipe P reaches the arrival pit R, and as shown in FIG. If the mounting position of the tool 20 is large, propulsion that secures the allowance L at the position of the pipe guide tool 20 is performed, and the mounting position is small as shown in FIG. If the pipe guide 20 is likely to fall off the sheath pipe P ′, the propulsion operation is temporarily stopped, and the pipe guide 20 is moved to the new pipe P as shown in FIG. It can move freely.
[0024]
At this time, if the rolling resistance of the roller 28 is smaller than the rolling resistance of the caster 24, the pipe guiding tool 20 moves within the sheath pipe P ′ even if the propelling action starts from the solid line in FIG. First, the advance L is secured by guiding the progress of the new pipe P. However, if the rolling resistance of the roller 28 is larger than the rolling resistance of the caster 24, the pipe guide 20 may move as the new pipe P is propelled and fall off from the opening of the sheath P '. Therefore, in that case, as shown in FIG. 9B and FIG. 10A, a member 40 such as a square bar is applied to the opening end face of the sheath tube P ′, and in this state, the solid line is changed to the chain line. As shown in the figure, a propelling action is performed, and the pipe guide 20 is brought into contact with the member 40 to prevent the movement and secure the allowance L. As a means for preventing movement of the tube guide 20, it is possible to employ a method in which a wheel stopper 41 is locked to the caster 24 as shown in FIG.
[0025]
When the laying of the required length of the new pipe P is completed, the mortar is placed between the sheath pipe P ′ and the new pipe P. As shown in FIG. 11A, when this pipe is laid, the joint portion is in a state in which the body size L ₁ is secured, and when the ground changes such as an earthquake, As shown in FIG. 5B, the protrusion 3 is allowed to extend until it comes into contact with the lock ring 5, and the contact prevents the insertion port 1 from coming out further. (C), when the propulsive force transmission member 14 contracts or collapses, the insertion slot 1 moves in the axial direction by the contraction margin L ₁ and the fluctuation is reduced. Absorbs and prevents further shrinkage to prevent joint breakage.
[0026]
Although the above embodiment was the case of the S-type joint, the present invention is an expansion / contraction with various separation preventing functions such as the SII-type joint shown in FIG. 14, the NS-type joint shown in FIG. 15, and the PII-type joint shown in FIG. Can be used for joints. In FIG. 15, 4 is a centering rubber. Also, as disclosed in Japanese Patent Laid-Open No. 2001-27092 and the like, as shown in FIG. 17, the pipe guide 20 'resists movement with respect to the new pipe P during propulsion by its fastening force, and pipes during earthquakes and the like. The road contraction can also be applied to a joint in a mode in which the insertion port 1 of the new pipe P is inserted and absorbed by a force larger than the fastening force. Furthermore, it can of course be employed for expansion joints such as K-type and T-type that have no separation preventing function and other non-expansion joints. The number of divisions of the tube guides 20 and 20 ′ can be arbitrarily selected as three equal divisions as shown in FIG.
[0027]
In the above-described embodiment, the new pipe P is newly installed in the existing pipe P ′. However, the present invention can of course be employed even when the new pipe P is newly installed in the sheath P of the new pipe.
[0028]
【The invention's effect】
As described above, the present invention allows the position of the pipe guide of the leading new pipe to be easily changed without hindering its guiding action, so that not only the performance required for the pipe insertion method is maintained. In addition, it is possible to eliminate the measurement work at the arrival shaft that is broken at the start of construction, and it is also possible to remove the lifting work by a crane or the like for preventing the head pipe from falling at the final stage of construction. Furthermore, in contrast to the conventional in-pipe insertion method, where the position of the pipe guide attached to the top pipe is determined from the design drawing, this invention allows the position of the pipe guide to be adjusted at the final stage of construction. Even if there is a change in the plan of the underground pipe, it can be adequately handled. For this reason, the workability of the pipe insertion method is improved.
[Brief description of the drawings]
FIG. 1 is a cut front view for explaining an in-pipe insertion method adopting an embodiment. FIG. 2 is a cut side view of FIG . 1. FIG. 3 (a) is an enlarged cross-sectional view of the main part of FIG. FIG. 4 is an enlarged view of a main part of FIG. 1, (c) is an enlarged view of a main part of FIG. 1. FIG. 4 shows a divided piece of the same example , (a) is a view along arrow AA in (b), (B) is a front view, (c) is a BB arrow view of (b). FIG. 5 (a) is a side view of the roller of the same embodiment, (b) is the front view, and (c) is a front view. Front view of the shaft of the roller, (d) is a front view of the rotation prevention tool of the roller. FIG. 6 is an explanatory view of the action of the roller, (a) is unable to rotate, (b) is rotatable. 7 main part sectional side view of FIG. 1 and FIG. 8 operational view of the tube insertion method employing the same embodiment Figure 9] operational view of the embodiment [10] the operation explanatory view [11] the stretching operation diagram of the pipe insertion method employing the example 12 shows another embodiment Are shown, (a) shows the right side view of the rollers, (b) is a fragmentary cross-sectional view 13 another example cross-sectional view of the essential part of a main portion sectional view and FIG. 14 pipe joint structure according to another embodiment [ 15 is a cross-sectional view of the main part of the other example . FIG. 16 is a cross-sectional view of the main part of the other example . FIG. 17 is a cross-sectional view of the main part of the other example . [Explanation of sheath tube propulsion method] [Fig. 20] Action diagram of conventional sheath tube propulsion method [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Insert port 2 Receptacle port 3 Insert port protrusion 5 Lock ring 6 Rubber band for seal 9 Push ring 13 Protective ring 14 Propulsion force transmission material 20 Pipe guide 20 for the new pipe ahead Pipe guide 24 for the joint part 24 Caster 27 Roller base 28 Roller 30, 31, 34 Roller rotation prevention tool (screw, bolt)
40 Tube guide movement prevention tool (square bar)
41 Ring stopper P 'sheath tube (existing tube)
S Start pit R Arrival mine

Claims (6)

When the new pipe P is inserted and laid in the sheath pipe P ′ buried between the start pit S and the arrival pit R, the new pipe P going backward to the receiving port 2 of the preceding new pipe P in the start pit S The insertion guide 1 is inserted and joined, and the new pipe P is pushed in the direction of the pipe axis, and the joined new pipes P are attached to the new pipes P, respectively. In the in-pipe insertion method of propelling in the sheath pipe P ′ up to the access pit R through the caster 24
When the most recent new pipe P of the joined new pipes P reaches the access pit R, the pipe guide 20 of the most recent new pipe P is movable with respect to the new pipe P. when adjusting the protruding length L in the arrival pit R new pipe P prior, the tube the tube guide member 20 is you do not fall off from the sheath tube P to move to the new pipe P of the top leading ' wherein a new tube for pipe guiding member 20 of the top leading to use for inserting method,
An annular saddle fitted into the new pipe P and the sheath pipe P ′ inner surface rolling caster 24 provided around the saddle are provided. The saddle is attached to the new pipe P via a roller 28 in the direction of the pipe axis. A tube guide that is movable and can be fixed at an arbitrary movement position.   2. The pipe guide according to claim 1, further comprising means for immobilizing the pipe guide 20 of the foremost new pipe P with respect to the sheath pipe P '.   The pipe guide according to claim 2, wherein the immobilizing means is a ring stopper 41 locked to the caster 24.   3. The pipe guide according to claim 2, wherein the non-moving means is a member 40 which is applied to an end face of a sheath pipe P 'opened to the access pit R and abuts the pipe guide tool 20. Ingredients. The pipe guide according to any one of claims 1 to 4, wherein the roller (28) can be prevented from rotating, and the saddle can be moved and fixed to the new pipe (P). Through screw anti-rotation screw 34 around the saddle, according to claim 1 or 5 the screw 34 is characterized in that so as to secure the saddle to the new pipe P by pressure contact with the outer circumferential surface of the new pipe P A tube guide according to any one of the above.

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