JP2005068983A - New pipe-laying device in pipe-in-pipe work method and new pipe laying process - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new pipe laying device and laying process in a simplified pipe-in-pipe work method, which simplifies equipment and material used for laying work and makes possible manual transporting of the device into construction sites and manual laying work. <P>SOLUTION: This device is provided with a wire for pulling operation to be inserted through an existing pipe and a wire bring-in tool for pulling the wire from a work launch pit to introduce a following new pipe element into the existing pipe by the length of the new pipe element. The wire bring-in tool consists of a body to be installed and fixed on the wire at the center of the tool, and a plurality of engaging parts extending radially from the body. Each engaging part is expandable in diameter, usually held in an expended diameter state by the force of a holding spring and engages with a step within the reception port at the rear end of the following new pipe element with its diameter kept expended. If necessary, this diameter can be reduced against the holding spring as much as the engaging part can pass through a new pipe element. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Detailed Description of the Invention

  The present invention relates to a new pipe laying device and a new pipe laying method in a pipe-in-pipe method, and more particularly to a new pipe laying device and a new pipe laying method that are useful when applied to a remote work site where operation of a work vehicle is difficult.

  Recently, as a rehabilitation method for the inner surface of an existing pipe having a relatively small diameter (about 200 to 500 mm), which is difficult to perform manually in the pipe, a new tubular element made of plastic is used as the rehabilitation material. A rehabilitation method using a so-called pipe-in-pipe method is proposed in which a new pipe of a predetermined length is assembled by sequentially inserting it into the existing pipe while adding pipes in the pipe axis direction, and the inner surface of the existing pipe is covered by the new pipe. Yes.

Problems to be solved by the invention

  In the pipe-in-pipe method, for example, the propulsion method is applied to the laying of new pipes, and in the propulsion method, the construction materials and equipment such as the installation of a hydraulic jack or propulsion stand as a propulsion device becomes quite large. Construction materials and equipment must be loaded onto the work vehicle and carried to the construction site. However, the construction site is located far away from the main road, such as agricultural water pipes and dredging pipes (railways, embankments, etc.). In some cases, it was difficult to carry out work vehicles and, therefore, large-scale construction materials and equipment.

  An object of the present invention is to provide a simplified new pipe laying apparatus and a new pipe laying construction method that can simplify construction materials and equipment and can be carried in by manual work and can be constructed.

Means for solving the problem

  The present invention is based on the fitting connection between the stepped receptacle at the rear end of the preceding new pipe element and the insertion opening at the front end of the subsequent new pipe element in the existing pipe between the start work pit and the arrival work pit. A new pipe laying device applied to the pipe-in-pipe method of laying a new pipe, and a traction operation wire inserted into the existing pipe and a traction operation of the wire, and a subsequent new pipe element from the start work pit A pull-in tool for pulling in the existing pipe by the length of the new tube element is provided, and the pull-in tool is installed and fixed on the wire at the central portion, and a plurality of the pull-out tools project radially from the main body. The locking portion is expandable and contractable in the radial direction, and normally retains the expanded state by a holding spring and receives the rear end portion of the succeeding new tube element under the expanded diameter state. It can be locked to the step in the mouth, while passing through the new tube element when necessary It has a structure which can be reduced in diameter against the holding spring to the extent according to the new pipe laying apparatus in pipe-in-pipe construction method according to claim.

  In a preferred embodiment of the new pipe laying device according to the present invention, the retracting tool is inserted and supported by the wire for traction operation in the through hole at the center of the main body, and in this inserted and supported state, the drawing tool is locked to the wire. Alternatively, the lock can be released. The engaging part of the retractor is provided with a means capable of restraining or releasing the restraint against the holding spring while the engaging part is in a reduced diameter state.

  Further, the present invention is based on the fitting connection between the stepped receptacle at the rear end of the preceding new pipe element and the insertion opening at the front end of the subsequent new pipe element in the existing pipe between the start work pit and the arrival work pit. When the pipe-in-pipe method for laying a new pipe is applied by applying the new pipe laying apparatus according to claim 1, the rear end portion of the preceding new pipe element already inserted in the existing pipe in the starting work pit is followed. The new tube element is connected under the fitting between the receiving port and the insertion port, and then the retracting tool is installed in the receiving port of the rear end of the succeeding new tube element, and its locking portion is expanded in the above-mentioned diameter in the receiving port. At the same time that the succeeding new pipe element is drawn into the existing pipe by engaging the stepped portion and moving the drawing tool to the vicinity of the entrance of the existing pipe by pulling the wire under this locked state. Extend the length of the leading new tube element by one pitch, and then one pitch in the starting work pit A new succeeding new tube element is connected to the rear end of the long preceding new tube element under the fitting of the receiving port and the insertion port, and the new succeeding new tube element is applied to the existing tube by the above-mentioned method by applying the above retractor. The present invention relates to a new pipe laying method characterized in that the length of the pushed-in new pipe element is further extended by one pitch, and the new pipe is laid in the existing pipe by repeating such operations.

  In a preferred embodiment of the new pipe laying method according to the present invention, the subsequent new pipe element is repeatedly pulled into the existing pipe and, as a result, one pitch extension of the preceding new pipe element is repeatedly applied by a single retractor. After the rotation, the retractor is left as it is in the preceding new tube element, and a new retractor is applied to the existing tube pull-in of the next succeeding new tube element. After repeating the extension several times, leave it in the preceding new tube element, and repeat the above operation to distribute the traction force during the wire traction operation for each new and remaining retraction tool in the tube. After laying the new pipe, use the reverse pulling operation force of the wire rod to reduce the diameter of the retraction tool remaining in the new pipe against the holding spring and release it from locking to the inner step of the receiving port. Can pass through Ungated, can be taken to reverse traction of the wire recovering retractor new tube remaining from the new tube.

  An embodiment of the present invention will be described below with reference to the accompanying drawings. As is apparent from FIGS. 1 and 2, the new pipe laying apparatus according to the present invention is a new traction operation wire 1 that can be passed through the existing pipe a (see FIG. 6) and the traction operation of the wire 1. A pull-in tool 2 for pulling the pipe element b (see FIG. 1) into the existing pipe a is provided. The wire 1 is usually a steel wire, but is not particularly limited as long as it is made of a material having high strength and flexibility.

  The retracting tool 2 includes a cylindrical main body 3 having a through hole 3a at the center, and the wire 1 is inserted into the through hole 3a of the main body 3, and in this inserted state, the lock means is applied. The wire 1 is firmly locked. As a locking means, FIG. 1 shows a lock piece 5 having a split and cone-shaped wedge portion 4 (see FIGS. 3 and 4) in cooperation with a tapered hole portion 3a1 formed in the insertion hole 3a of the main body portion 3. When the lock piece 5 is tightened, the wedge portion 4 is closed at the portion of the crack 6 and the wire rod 1 is chucked and locked, and when released from tightening, the wedge portion 4 is opened at the portion of the crack 6 and unlocked. It becomes a state. A screw 7 (see FIG. 4) is applied to tighten and loosen the lock piece 5, and the screw 7 is screwed into the screw hole 10 of the main body portion 3 through the insertion hole 9 of the flange portion 8 of the lock piece 5. The lock means itself having such a configuration is publicly known, and various other known lock means can be applied.

  Further, the retractor 2 includes a plurality of locking portions 11 projecting radially from the main body portion 3, and the locking portions 11 can be expanded and contracted in the radial direction, and are normally expanded by a holding spring 12. The diameter state is maintained, and when necessary, the diameter can be reduced against the holding spring 12.

  FIGS. 1 and 2 show a mechanism that includes a lever 13, a link 14, and a slider 15 as components as a mechanism for causing the locking portion 11 to have an expansion / contraction function. In the above mechanism, the lever 13 is installed to be inclined to the outside of the main body 3 and is pivotally connected to a portion from the tail side of the main body 3 at the inclined low end, and in the receiving port c of the new tube element b at the inclined high end. A claw portion 16 is provided for locking to the step c1. The slider 15 is provided in a portion of the main body 3 from the head side so that it can move linearly along the main body 3 between the starting position and the reaching position. Usually, the slider 15 is held and restrained to the starting position by the holding spring 12. Yes. In this holding and restraining state, the slider 15 is locked to the stepped portion 17 of the main body 3 and is prevented from moving to the tail side (the side opposite to the holding spring 12). The link 14 pivotally connects the intermediate portion of the lever 13 and the slider 15, and converts the swinging motion of the lever 13 into a linear motion and transmits it to the slider 15.

  When the slider 15 is held and restrained at the starting position by the holding spring 12 as shown in FIG. 1, the lever 13 pivotally connected to the slider 15 via the link 14 is held in the locking portion 11 having the above configuration. The claw portion 16 installed at the inclined high end portion of the lever 13 occupies the diameter-expanded position most distant from the main body portion 3 in the radial direction. Incidentally, the locking part 11 is designed to have such a size that the claw part 16 can be just locked to the stepped part c1 in the receiving port c of the new tube element b in the expanded diameter state.

  When the claw portion 16 is pressed in the direction in which the diameter is reduced from the diameter-expanded state shown in FIG. 1, the lever 13 swings in the direction of decreasing the tilt angle with the pivot connecting portion 13a as a fulcrum, and this swinging. The movement is transmitted as a linear movement to the slider 15 via the link 14. Accordingly, the slider 15 slides from the start position toward the arrival position against the holding spring 12 as the lever 13 swings, and the lever 13 swings against the holding spring 12 and thus the claw 16 is reduced in diameter. to enable. The mechanism itself for expanding and contracting the retaining portion 11 against the holding spring 12 is known, and various other known expansion / contraction mechanisms can be employed.

  FIG. 5 shows a state in which the engaging portion 11 is reduced in diameter until it can pass through the new tube element b, and a pin hole 18a between the slider 15 and the main body portion 3 so as to match in this reduced diameter state. If 18b is provided and the stop pin 19 can be inserted into and removed from the pin holes 18a and 18b, the locking portion 11 can be constrained to a reduced diameter state or released from the constrained state when necessary.

  As shown in FIG. 2, the locking portions 11 are installed on the outer peripheral portion of the main body portion 3 at a plurality of locations, for example, at four locations at intervals of 90 °, and the claw portions 16 are arcuate in the direction around the central axis of the main body portion It is formed and fixed at the inclined high end of the lever 13 at its midpoint, and the curvature of the arc substantially matches the curvature of the stepped portion c1 in the receiving port c of the new tube element b to be locked. By forming the claw portion 16 in an arc shape in this way, the stepped portion c1 to be locked can be locked linearly over a relatively wide angle range, and a stable and reliable locking state is ensured. it can.

  When laying a new pipe by applying the apparatus of the present invention, as shown in FIG. 6, first, the wire rod 1 for traction operation is placed in the existing pipe a between the start work pit A and the arrival work pit A ′. The leading end side of the inserted wire 1 is pulled out to the ground via a guide roller d installed in the reaching work pit A ′. On the other hand, the retractor 2 is positioned on the start work pit A side, for example, on the ground part of the start work pit A in a locked state on the wire 1, and the engaging part 11 of the retractor 2 is in a reduced diameter state ( (See FIG. 5). Note that if there are existing work pits A and A ′, they can be applied with some modifications if necessary. However, if there is no existing work pit, a new work pit may be formed by excavation.

  Next, as shown in FIG. 7, while passing the first new tube element b1 from the rear end side of the wire rod 1 toward the front end, the retractor 2 in a reduced diameter state is passed through and installed at the bottom of the work bit A. Place on the work table e for centering.

  Thereafter, the engaging portion 11 of the retracting tool 2 is returned to the expanded state, and the retracting tool 2 is pulled to the receiving port c1 at the rear end of the first new tube element b1 by pulling the wire 1 as shown in FIG. As shown in FIG. 3, the locking portion 11 and the claw portion 16 (see FIG. 1) can be locked to the stepped portion c1 in the receiving port portion c1. Thus, by pulling the wire 1 from the arrival work pit A 'side in the state shown in FIG. 8, the first new pipe element b1 is inserted into the existing pipe a through the retractor 2 as shown in FIG. You can pull in. In the retracted state of the first new tube element b1, the receiving port c at the rear end is stopped in the start work pit A in order to make a connection with the subsequent new tube element with visual confirmation.

  After the drawing of the first new pipe element b1 into the existing pipe a is completed, the wire 1 is pulled in the reverse direction to return the drawing tool 2 to the position shown in FIG. It is restrained to the reduced diameter state again. After that, the second new tube element b2 is placed on the work table e in the start work pit A in the same procedure as the first new tube element b1, and the insertion opening c ′ at the front end thereof is used as the rear end of the first new tube element b1. Are fitted and joined to the receptacle c. On the other hand, the engaging part 11 of the retracting tool 2 is returned to the expanded state, and the pulling operation of the wire 1 is performed so that the engaging part 11 of the retracting tool 2 is stepped in the receiving port c at the rear end part of the second new tube element b2. By engaging with c1, preparation for drawing the second new tube element b2 into the existing tube a is completed as shown in FIG. Thus, by pulling the wire 1 from the arrival work pit A ′ side in this state, as shown in FIG. 11, the second new pipe element b2 is joined to the length of the second new pipe element b2 in the joined state with the first new pipe element b. Only can be drawn into the existing pipe a. By repeating such operations, a new tube element (including a joined body) that has already been inserted into the existing tube a is used as a preceding new tube element, and subsequent new tube elements are sequentially added to the preceding new tube element. Thus, by sequentially adding new tube elements in this way, the new tube B can be laid over the entire length of the existing tube a as shown in FIG.

  FIG. 13 shows another embodiment of the new pipe laying method of the present invention. According to this embodiment, a plurality of retractors 2 are applied, and the retractors 2 are applied to retract several new tube elements. It remains at that position while being locked to the stepped portion c1 in the receiving port c at the rear end of the last new tube element. Other work procedures are not substantially different from the previous embodiment. If a plurality of retraction tools 2 are applied in this way, the traction force of the wire 1 can be dispersed for each retraction tool 2 remaining in the pipe, and workability at the time of retraction is improved. It is useful when applied to relatively long construction.

  When the wire 1 is reversely pulled in the state shown in FIG. 13 (towing from the start work pit A side), as shown in FIG. 14, the claw portion 16 of the locking portion 11 of the retractor 2 is separated from the step c1. Instead, it is locked to the tip of the insertion slot c ′. If the reverse traction is further continued in this state, for example, the claw portion 16 moves in a direction in which the diameter thereof is reduced against the holding spring 12 by the inclined surface 16a on the back surface being pushed by the tip of the insertion port c 'that abuts the claw portion 16a. As a result, it will eventually come off the tip of the insertion slot c ′ and become completely free, so as shown in FIG. 15, as the wire rod 1 is pulled backward, it moves in the new pipe toward the start work pit side, All the retractors 2 together with the wire 1 can be recovered from the inside of the new pipe.

  The new pipe laying device of the present invention only needs to be provided with a wire rod 1 for pulling operation and at least one retractor provided on the wire rod, and for example, a manually operated winch is sufficient for towing the wire rod. The construction materials and equipment can be greatly simplified as compared with the conventional apparatus to which the hydraulic control type propulsion device is applied.

In the present invention, the construction materials and equipment are simplified in this way, so that it is possible to carry into a construction site by applying a simple transport vehicle such as a wheelbarrow, and it is necessary to pass through a remote road or a narrow mountain road. Even so, it can be easily carried in and installed.

The invention's effect

  As described above, the present invention can provide a simple new pipe laying apparatus and a new pipe laying method for pipe-in-pipe construction, and is particularly applicable to remote work sites where operation of work vehicles is difficult. And useful.

It is a longitudinal cross-sectional view which shows one Embodiment of this invention apparatus. FIG. It is an enlarged front view of the wedge-shaped lock piece shown in FIGS. It is an enlarged vertical sectional view of the same. It is a figure corresponding to FIG. 1 which shows the retractor in a diameter-reduced state. It is a longitudinal cross-sectional view which shows roughly the condition which installed this invention apparatus in the existing pipe of construction object. It is a longitudinal cross-sectional view which shows the installation condition of the new pipe | tube element in a start work pit. It is a longitudinal cross-sectional view which shows the condition of the new tube element in the pushing posture. It is a longitudinal cross-sectional view which shows the condition at the time of completion | finish of pushing of the new pipe element in the existing pipe. It is a longitudinal cross-sectional view which shows the condition at the time of supply and connection of the succeeding new tube element with respect to a preceding new tube element. It is a longitudinal cross-sectional view which shows the condition of the subsequent new tube element in the pushing posture. It is a longitudinal cross-sectional view which shows the condition at the time of completion | finish of laying of a new pipe. It is a longitudinal cross-sectional view which shows the condition which implemented the laying of the new pipe using the several drawing tool. It is a figure which shows the condition at the time of reverse pulling operation of a wire. It is a figure which shows the collection | recovery state of the drawing tool by reverse traction operation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wire for pulling operation 2 Pull-in tool 3 Main-body part 3a Through-hole 3a1 Tapered hole part 4 Wedge part 5 Lock piece 6 Crack 7 Screw 8 Flange part 9 Insertion hole 10 Screw hole 11 Locking part 12 Holding spring 13 Lever 13a Pivoting connection Part 14 Link 15 Slider 16 Claw part 17 Step part 18a First pin hole 18b Second pin hole 19 Stop pin

Claims (5)

In the existing pipe between the start work pit and the arrival work pit, a new pipe is laid with a fitting connection between the stepped receptacle at the rear end of the preceding new pipe element and the insertion opening at the front end of the subsequent new pipe element. A new pipe laying device that is applied to the pipe-in-pipe construction method, and the traction operation wire rod inserted into the existing pipe and the traction operation of the wire rod, the subsequent new pipe element is newly introduced from the start work pit into the existing pipe. A retractor for retracting the tube element by the length is provided, the retractor being installed and fixed on the wire at the central portion, and a plurality of locking portions projecting radially from the body. The locking portion is expandable / contractable in the radial direction, and normally maintains the expanded state by a holding spring, and in this expanded state, the stepped portion in the receiving port of the rear end portion of the succeeding new tube element To the extent that it can pass through the new tube element when necessary New tube laying device in pipe-in-pipe construction method, characterized in that has a structure which can be reduced in diameter against the lifting spring. The drawing tool is configured to be inserted and supported by a wire for traction operation in a through hole at the center of the main body, and configured to be locked or unlocked with respect to the wire in the inserted and supported state. The new pipe laying device according to 1. 3. A new pipe according to claim 1, wherein the engaging portion of the retractor is provided with means capable of restraining or releasing the restraining portion against the holding spring in a reduced diameter state of the engaging portion. Laying equipment. In the existing pipe between the start work pit and the arrival work pit, a new pipe is laid with a fitting connection between the stepped receptacle at the rear end of the preceding new pipe element and the insertion opening at the front end of the subsequent new pipe element. When the pipe-in-pipe construction method is performed by applying the new pipe laying device according to claim 1, the rear new pipe element is inserted into the rear end of the preceding new pipe element inserted into the existing pipe in the starting work pit. After connecting with the insertion port, the retractor is installed in the receiving port at the rear end of the succeeding new tube element, and the locking portion is locked to the step in the receiving port under the expanded diameter state. In this locked state, the pulling tool is moved to the vicinity of the entrance of the existing pipe by pulling the wire rod, so that the succeeding new pipe element is drawn into the existing pipe and at the same time the length of the preceding new pipe element. Of the preceding new pipe element with one pitch extension in the starting work pit. At the end, a new succeeding new tube element is connected under the fitting of the mouth and the insertion port, and the new succeeding new tube element is pushed into the existing tube by applying the above drawing tool and the length of the preceding new tube element. A new pipe laying method characterized in that the pipe is further extended by one pitch, and a new pipe is laid in the existing pipe by repeating such an operation. After pulling the succeeding new tube element into the existing pipe and extending the pitch of the preceding new tube element by one pitch repeatedly by applying one retractor several times, leave the retractor in the preceding new tube element as it is. Applying a new retracting tool to the existing tube pull-in of the next succeeding new tube element and repeatedly performing one pitch extension of the preceding new tube element a plurality of times as before, leaving it in the preceding new tube element as it is, By repeating these operations, the new pipe is assembled while distributing the traction force during the wire traction operation for each new and remaining retractor in the pipe.After laying the new pipe, the reverse traction operation force for the wire is applied. By using the retracting tool remaining in the new pipe against the holding spring, the diameter of the retractor is released so that it can be released from being locked to the inner step of the receiving port and can pass through the new pipe. Remaining retractor New tubes laying method according to claim 4, wherein the recovering from the new tube.

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