JP4759651B2 - Synthetic resin pipe burying equipment - Google Patents

Description

  The present invention relates to a synthetic resin pipe embedding device for directly embedding a synthetic resin pipe such as a hard vinyl chloride pipe in the ground by a propulsion method.

  2. Description of the Related Art Conventionally, a propulsion method for propelling a pipe following a leading excavator is known as a method for burying a sewer pipe or another pipe in the ground. In this propulsion method, as shown in the cross-sectional view schematically showing the propulsion method in FIG. 16, the starting shaft 201 and the reaching shaft 202 are constructed on the planned burial line of the pipeline to be buried, and the starting shaft 201 is installed in the starting shaft 201. Propulsive force is given to the pipe 204 by the pushing device 203, and propulsive force is transmitted to the excavator 205 through the pipe 204 for propulsion. Then, by propelling the excavator 205 to the reaching shaft 202, the continuous pipe 204 is buried between the starting shaft 201 and the reaching shaft 202 to form a pipeline.

  As the pipe constituting the pipe, a concrete pipe or a hard vinyl chloride pipe having a diameter of about 200 mm to 400 mm is generally employed. For example, in the case of a pipe having a diameter of about 300 mm, Synthetic resin pipes such as hard vinyl chloride pipes (also simply referred to as “PVC pipes” in this specification and claims) are often used because of the above relationship and corrosion resistance.

  For example, in the case of a PVC pipe that has been widely adopted as a synthetic resin pipe in recent years, as shown in FIG. 16 above, when this PVC pipe is embedded, the propulsive force that can be transmitted by the PVC pipe is small. In order to prevent the propulsive force for propelling the excavator 205 from being directly transmitted to the PVC pipe 204, a metal inner tube 206 for transmitting the propulsive force of the excavator 205 is inserted into the PVC pipe 204, and this Propulsive force is transmitted to the excavator through the inner pipe 206. In this case, thrust transmission to the PVC pipe is performed by a main pushing device 203 provided in the start shaft 201.

  On the other hand, in such a method of propelling a PVC pipe, a new PVC pipe is connected between the main pushing device provided in the start shaft and the buried PVC pipe every time the propulsion of the PVC pipe of a predetermined length is completed. In addition, a new inner pipe is placed inside this PVC pipe, and a power line that transmits power to the leading excavator, a signal line that transmits a control signal, and a lubricant is filled between the excavator and the ground Various wires and pipes such as a lubricant supply pipe are arranged and connected. When a mud construction method machine is adopted, pipes such as a mud pipe and a mud pipe are arranged and connected in addition to the wires and pipes.

  In addition, in order to monitor the propulsion direction of the excavator and control the excavator to always propel it in the correct direction, laser light is emitted toward the excavator along the planned buried line of the pipeline from the starting pit. Yes. This laser beam is applied to a target provided in the excavator along the inner tube.

  In addition, as a prior art related to the thrust transmission device provided between this type of excavator and the main pushing device, a transmission member having an open portion extending over the entire length on a part of the outer periphery, a U-shaped shelf, a connection portion, and the like There is a U-shaped shelf that can easily embed or remove necessary piping / wiring materials while securing a laser passage area in the upper part. The connecting portion of this thrust transmission device is composed of an end plate and screws, collars, bolts, etc., and by inserting the collar between the screws and bolts, there is a gap between the end plates. There is a configuration in which a thrust transmission device capable of refraction is configured so that a deviation in the propulsion direction between the excavator and the thrust transmission device can be corrected (for example, see Patent Document 1).

  As another prior art, a holding mechanism for holding and fixing the buried pipe with frictional force from the inside according to the strength of the buried pipe is provided on the drive shaft body. In some cases, a propulsive force is transmitted from the inside (see, for example, Patent Document 2).

JP 2000-248885 A Japanese Patent Laid-Open No. 2-144498

  By the way, in recent years, the environment in which PVC pipes (synthetic resin pipes) such as sewer pipes are buried is to minimize the impact on the ground restrictions and surrounding traffic conditions, and from the relationship of cost reduction for starting and reaching vertical shafts. There is a demand to widen the interval between the shafts. As a demand for this, for example, the development of a long-distance propulsion method close to 200 m has become a high industry need.

  However, when the above-mentioned PVC pipe is to be buried close to 200 m, it is possible to cope with the fact that buckling caused by transmitting propulsive force to the excavator 200 m ahead by the inner pipe which is an elongated structure affects the PVC pipe. As shown in FIG. 16, a device for dealing with an increase in the peripheral friction force 208 between the PVC pipe 204 and the natural ground 207 transmitted by the main pushing device 203 is provided in a narrow excavation section, and a laser. It becomes difficult to install a lot of components such as light irradiation space, pipes such as sending and discharging mud pipes, wires such as electric wiring, etc. inside a narrow PVC pipe.

  In particular, the propulsive force of the PVC pipe greatly increases the peripheral frictional force as the construction distance increases. Therefore, it is very difficult to manufacture a PVC pipe that can withstand the increase in the peripheral frictional force. In other words, the construction distance of the conventional propulsion method for embedding synthetic resin pipes such as polyvinyl chloride pipes is limited by the allowable propulsive force of synthetic resin pipes such as vinyl chloride pipes, and only short-distance construction of 100 m or less has been performed. Is the current situation.

  Moreover, when the burying of the PVC pipe into the ground is completed, the inner inner pipe is all recovered, and the electric wires and pipes are also recovered accordingly. At this time, since the wires and pipes inserted into the inner pipe are generally collected together on the start shaft side, the inner pipe needs to have a recoverable function and structure, and its large pull Although it is necessary to be able to withstand the force, it is very difficult to recover the inner tube at a driving distance of 200 m.

  In addition, in the propulsion method, the propulsion direction of the excavator may deviate from the planned burial line of the pipeline, and it is necessary to always control the excavator's propulsion direction to match the planned burial line. It is necessary to secure a laser passage area.

  In the above-mentioned patent document 1, since piping and wiring are arranged on a U-shaped shelf whose upper part is open and the upper part is secured as a laser passage area, other parts cannot be mounted on the upper part of the inner pipe. In addition, if the piping / wiring arranged on the U-shaped shelf jumps up at one place in the axial direction, the laser passage area is blocked, which hinders measurement. In addition, in the case of a U-shaped shelf whose upper part is opened in this way, if it tries to satisfy the high pulling force required for recovery after the synthetic resin pipe is buried, the size of the end plate at the connection part and the bolt With the increase in size, it becomes difficult to install various devices and to secure piping, wiring, laser passage areas, and the like.

  Further, in Patent Document 2, the inner surface of the buried pipe is pressed by the holding mechanism, and the propulsive force is transmitted by the frictional force. Therefore, the pressing area is increased to transmit a large propulsive force, and the holding mechanism is installed. As the number increases, it becomes difficult to secure equipment, piping, wiring, laser passage area, etc. that need to be placed inside. In addition, in the case of such a structure that depends on the frictional force, it is difficult to manage the installation of the holding mechanism depending on the state of the contact surface.

  Therefore, an object of the present invention is to provide a synthetic resin pipe embedding device capable of stable long-distance propulsion by a propulsion method in which a synthetic resin pipe is directly buried in the ground.

In order to achieve the above object, the present invention provides a synthetic resin pipe having a predetermined length that is embedded in a ground excavated by an excavator that provides a propulsive force with a main pushing device and is coupled in a propulsion direction, and the synthetic resin pipe A synthetic resin pipe embedding device comprising an inner pipe of a predetermined length that is disposed inside and coupled to the propulsion direction of the excavator to transmit a propulsive force to the excavator. A coupling portion that couples the inner tube in a refractive manner, and a pusher that loads the propelling force of the synthetic resin tube at a predetermined interval that is within a range of an allowable propulsive force of the synthetic resin tube, A rear end face for engaging the pusher with a coupling portion of the synthetic resin pipe coupled in the propulsion direction, and the inner pipe projects the pusher in a radial direction intersecting the propulsion direction to Engage with the rear end face of the joint A result, the state of the load receiving driving force for propelling the synthetic resin tube with a front surface of the pusher, thrust support projecting to state the pusher detached from the plastic tube and stored toward the inner tube -It has a storage mechanism, and the thrust support protrusion / storage mechanism includes a pull-back rod that holds the pusher in a protruding state and stores it in the radial direction toward the inner tube . In this specification and claims, the radial movement of the synthetic resin tube is referred to as protrusion / storage. As a result, the propelling force of the synthetic resin pipe is not transmitted only by the main pushing device, but is propelled to the synthetic resin pipe by the inner pipe in a predetermined length unit so that it is within the allowable propulsive force that can be loaded by the synthetic resin pipe. Since the force is transmitted, the construction distance can be extended to the allowable propulsive force of the inner pipe. In addition, due to the bendable joint structure, even if the follow direction of the synthetic resin pipe differs depending on the propulsion direction of the excavator and the force received by the synthetic resin pipe from the ground, the joint portion of the inner pipe is refracted and follows the excavator The direction of the synthetic resin tube to be made can be changed smoothly. In addition, after the synthetic resin pipe is embedded, if the pusher is retracted by the protruding and retracting mechanism and the engagement with the synthetic resin pipe is released, the engagement between the inner pipe and the synthetic resin pipe is broken and the inner pipe is recovered. Can be done quickly. Then, the pusher can be stored and the engagement with the synthetic resin tube can be disconnected by operating the pull-back rod, so that the pusher can be easily engaged with good workability.

  In addition, the inner pipe may be formed of a tubular body having a space penetrating in the axial direction, thereby using the space penetrating in the axial direction of the inner pipe as a laser passage area to control the direction of the excavator. Can be performed stably.

  Further, the pusher may be arranged at a vertical position of the inner pipe. In this way, even if the direction control in the left-right direction is performed when the synthetic resin pipe is buried, the thrust can be transmitted at the vertical position of the inner pipe and stable excavation can be performed.

The pull-back rod may have a function of storing the pusher by providing a time difference in order from the end side. In this way, the pusher can be released in order with the pull-back rod, so that the force required for the release operation can be suppressed and work can be performed with good operability.

  Furthermore, the inner pipe may include a lubricant injection part that injects a lubricant to the outside of the synthetic resin pipe. In this way, even when the synthetic resin pipe is buried for a long distance, the peripheral surface frictional force determined by the contact area between the synthetic resin pipe and the natural ground can be suppressed at a predetermined interval, and the propulsion resistance of the synthetic resin pipe can be suppressed. .

  In addition, the lubricant injection portion engages with the synthetic resin tube in a state of projecting in the radial direction, and separates from the synthetic resin tube in a state of being stored in the radial direction, and the lubricant injection A sliding material injection projecting / storing mechanism for projecting the tube from the outside of the inner tube toward the synthetic resin tube or storing the tube toward the inner tube, and the synthetic resin tube is a sliding material of the lubricating material injection tube A lubricant may be injected from the lubricant injection tube to the outside of the synthetic resin tube at the injection position, and a check mechanism for preventing a backflow from the outside of the synthetic resin tube may be provided. In this way, when the synthetic resin pipe is buried and the inner pipe is recovered, the lubricating material injection apparatus can be separated from the synthetic resin pipe by storing the lubricating material injection pipe of the lubricating material injection apparatus facing the inner pipe. Therefore, it is possible to prevent the slipping material or the groundwater from entering the synthetic resin pipe from the position of the separated slipping material injection pipe by the check mechanism.

Further, the lubricant injection projecting / retracting mechanism has a rotation stopper for stopping the lubricant injection pipe at a predetermined position in the circumferential direction of the synthetic resin pipe, and a main push of the inner pipe coupled to the propulsion direction of the excavator. You may comprise the pull-back rod which stores the said rotation prevention part from the apparatus side. In this way, after embedding the synthetic resin tube, the anti-rotation portion can be retracted by operating the pull-back rod and the engagement with the synthetic resin tube can be cut off. Can be disengaged.

  According to the present invention, the propulsion force applied to the synthetic resin pipe is limited to the range of the allowable propulsive force by the means described above, and the synthetic resin pipe is directly buried in the ground within the allowable propulsive force range of the inner pipe. Long-distance propulsion by the construction method can be performed stably.

It is sectional drawing of the axial direction which shows the normal coupling | bond part of the synthetic resin pipe | tube embedding apparatus which concerns on one embodiment of this invention. It is a perspective view of the normal coupling part shown in FIG. (a) is a top view of the normal connection part shown in FIG. 2, (b) is a top view of the coupling metal fitting in the normal connection part. It is IV-IV sectional drawing shown in FIG. (a), (b) is sectional drawing which shows the coupling | bond part of the feed / discharge mud pipe shown in FIG. It is drawing which shows the thrust support part of the synthetic resin pipe | tube embedding apparatus shown in FIG. 1, (a) is sectional drawing of an axial direction, (b) is a top view. (a) is a perspective sectional view showing a thrust support part shown in FIG. 6, and (b) is an exploded perspective view showing a connecting part of a pull-back rod. It is VIII-VIII sectional drawing shown in FIG. FIGS. 7A and 7B are diagrams illustrating a protrusion / retraction operation of the thrust support portion illustrated in FIG. 6, where FIG. 7A is a cross-sectional view in a protruding state, and FIG. It is sectional drawing which shows typically the propulsion construction method by the synthetic resin pipe | tube embedding apparatus which concerns on this invention. It is drawing which shows the lubricating material injection | pouring part of the synthetic resin pipe | tube embedding apparatus shown in FIG. 1, (a) is sectional drawing of an axial direction, (b) is a top view. FIG. 12 is a perspective sectional view showing the lubricant injection part shown in FIG. 11. It is XIII-XIII sectional drawing shown in FIG. It is sectional drawing which shows the example of the non-return mechanism in the lubricating material injection | pouring part shown in FIG. It is sectional drawing which shows the other example of the non-return mechanism in the lubricating material injection | pouring part shown in FIG. It is sectional drawing which shows a propulsion construction method typically.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, an example in which a vinyl chloride pipe is taken as an example of a synthetic resin pipe, an excavating machine is a muddy water type, and the right side of the figure is the start side will be explained. Moreover, in the document of this specification and a claim, the front which excavation machine digs is called the front side, and back is called the back side. In particular, “A” is used when referring to the front side configuration, “B” is used when referring to the rear side configuration, and when both are included, the description is omitted. Also, the same reference numerals are given to the same components as those shown in FIG. 16 described above.

  1 is a sectional view in the axial direction showing a normal coupling portion of a synthetic resin pipe embedding device according to an embodiment of the present invention, and FIG. 2 is a perspective view of the normal coupling portion shown in FIG. a) is a plan view of the normal coupling portion shown in FIG. 2, and (b) is a plan view of the coupling fitting in the normal coupling portion. 4 is a cross-sectional view taken along the line IV-IV shown in FIG. 1, and FIGS. 5 (a) and 5 (b) are cross-sectional views showing the coupling portion of the feed / discharge mud pipe shown in FIG.

  As shown in FIG. 1, the normal coupling portion 1 is provided with a coupling portion 13 of inner pipes 12A and 12B at a position slightly away from the coupling portion 3 of the PVC pipe 2 having a predetermined length to the starting side (right side). . A collar 5 is provided on the outer periphery of the joint portion 3 of the PVC pipe 2, and a seal material 6 seals between the collar 5 and the PVC pipe 2. This sealing material 6 prevents groundwater and the like from entering the joint 3 of the PVC pipe 2 from the natural ground 207.

  Further, as shown in FIGS. 3 (a) and 3 (b), the normal coupling portion 1 includes a claw portion 15 of an alignment fitting 14 provided at the rear end of the front inner tube 12A and a rear inner tube 12B. A step portion formed so that the claw portions 15 and 17 of the alignment fittings 14 and 16 protrude in the vertical direction in a state where the claw portions 17 of the alignment fitting 16 provided at the front end of the alignment fitting 16 are engaged. Fasteners 19 are covered from above and below to engage 18.

  As shown in FIG. 2, these fastening fittings 19 are connected to the left and right side portions and the upper and lower portions of the inner pipe 12 by fastening fitting holding parts 21. The fastening bracket holding component 21 connects the fastening brackets 19. The fastening bracket holding component 21 connects the fastening brackets 19 arranged at the left and right positions of the inner pipe 12, and the vertical positions of the inner pipe 12. It has the vertical connection plate 23 which connects the arrange | positioned fastener 19 in the front-back position. These connecting plates 22 and 23 are fixed to the fastening bracket 19 with bolts 24 and 25. In this way, by connecting the left and right positions and the vertical position of the fastening bracket 19 with the plates 22 and 23, the inner pipes 12 </ b> A and 12 </ b> B are joined by the alignment fittings 14 and 16 without fixing the fastening bracket 19 to the inner pipe 12. is doing.

  As shown in FIGS. 3 (a) and 3 (b), the front inner tube 12A and the rear inner tube 12B coupled as described above have the claw portions 15 and 17 engaged with each other. An axial gap S1 and a horizontal gap S2 are formed between the alignment fittings 14 and 16. Accordingly, the coupling portion 13 of the inner pipes 12A and 12B can be refracted in the left-right direction within the range of the axial gap S1 and the left-right gap S2. That is, the inner pipes 12A and 12B have a flexible coupling structure in which the coupling portions 13 of the inner pipes 12A and 12B can be refracted by the alignment fittings 14 and 16, the fastening fitting 19, and the fastening fitting holding component 21.

  By adopting such a structure, if the propulsion direction of the excavator 205 is controlled, the straight direction according to the manufacturing accuracy of the inner pipes 12A and 12B, and the PVC pipe 2 received from the natural ground after the excavator 205 passes. Even when the following direction is reversed, the direction of the PVC pipe 2 that is refracted in the gaps S1 and S2 between the alignment fittings 14 and 16 and is made to follow the excavator 205 can be smoothly changed.

  Further, with such a structure, even if a large pulling force is applied in the axial direction, a large pulling force can be received by the alignment fittings 14 and 16 locked by the fastening fitting 19, so that a large pulling force is applied. It is also possible to pull out the entire inner tube 12 with a pulling force.

  As shown in FIG. 4, the inner tube 12 is formed of a hollow tube having a rectangular cross section, and a space 28 penetrating in the axial direction is formed. The space 28 is used as a laser passage area. Support rollers 31 are respectively provided at the vertical positions of the inner pipe 12 having a rectangular cross section. A tube support fitting 30 having an L-shaped cross section is fixed to both sides of the inner tube 12, and spacers 32 are provided outside the tube support fitting 30. The spacer 32 is formed of a synthetic resin material or the like. The inner tube 12 is positioned at the center of the PVC tube 2 by the support roller 31 and the spacer 32.

  The support rollers 31 provided at the upper and lower positions of the inner pipe 12 are rotatably provided on a roller support base 33 fixed to the left and right sides with respect to the axis of the inner pipe 12. Two are arranged symmetrically at the bottom. The upper and lower surfaces of the inner pipe 12 having the rectangular cross section are used as seating surfaces of the roller support bases 33. In this embodiment, a temporary receiving roller 34 is provided at the lower front portion of the inner tube 12. This temporary receiving roller 34 temporarily receives the weight of the inner pipe 12 inserted into the PVC pipe 2 so that the subsequent joining work can be easily performed. The temporary receiving roller 34 is provided on a roller support base 36 fixed to a pedestal 35 provided on the inner pipe 12. This pedestal 35 is provided straddling a pull-back rod 66 which is a lower storing operation portion described later.

  Further, the pipe support fitting 30 is provided with an annular feed / drain mud pipe support 37 facing downward, and the mud feed pipe 41 and the mud pipe 42 are supported by the feed / drain mud pipe support 37. A power line 43 and a water pipe 44 are disposed in the upwardly open space 38 of the pipe support 30.

  On the other hand, as shown in FIG. 5 (a), the joint 45 between the mud pipe 41 and the mud pipe 42 is provided with a large-diameter pipe 46 at the rear end of the front mud pipe 41A and the mud pipe 42A. A seal material 47 is provided, and a seal portion 48 in contact with the seal material 47 is formed at the front ends of the rear mud pipe 41B and the exhaust mud pipe 42B. As a result, as shown in FIG. 5 (b), the mud pipe 41B and the mud pipe 42B can be bent at the joint 45, and the inner pipe 12 which is coupled so as to be refracted can be bent. It can follow and refract similarly.

  The normal coupling portion 1 configured as described above is a normal coupling portion in the PVC pipe 2 having a predetermined length and the inner pipe 12 having a predetermined length that are coupled in the propulsion direction of the excavator 205. A thrust support portion 50 and a lubricant injection portion 80 described below are provided at predetermined positions between the coupling portions 1.

  6 is a drawing showing a thrust support portion of the synthetic resin pipe embedding device shown in FIG. 1, wherein (a) is an axial sectional view and (b) is a plan view. In the plan view, the collar 5 and the sealing material 6 are omitted. FIG. 7A is a perspective sectional view showing the thrust support portion shown in FIG. 6, and FIG. 7B is an exploded perspective view showing the connecting portion of the pull-back rod. 8 is a cross-sectional view taken along the line VIII-VIII shown in FIG. 6, FIG. 9 is a drawing showing the protruding / retracting operation of the thrust support portion shown in FIG. 6, (a) is a cross-sectional view in the protruding state, and (b) is It is sectional drawing of a retracted state. In this embodiment, thrust support portions are provided at the upper and lower positions of the inner tube. In FIG. 7, the total length is shortened.

  As shown in FIGS. 6 (a), 6 (b), 7 (a), 7 (b), the thrust support portion 50 provided in the synthetic resin pipe embedding device 120 is coupled in the propulsion direction as described above. The PVC pipe 2 having a predetermined length is provided at predetermined intervals. The thrust support portion 50 is provided in the coupling portion 3 at a position where the propulsive force for propelling the plurality of PVC pipes 2 coupled in the propulsion direction does not exceed the allowable propulsive force of the PVC pipe 2. The propulsive force of the PVC pipe 2 located on the front side is supported by the inner pipe 12. An engagement recess 9 is formed at the front end of the rear PVC pipe 2B in the coupling portion 3 of the PVC pipe 2 provided with the thrust support portion 50, and the inner pipe 12 faces the engagement recess 9. A pusher 52 as an engaging member protruding in the radial direction is provided. The pusher 52 has a cylindrical portion 53 formed on the inner tube side, and is inserted into the engagement recess 9 of the polyvinyl chloride tube 2 on the outer side, and an engagement portion 54 is provided in contact with the rear end surface of the front PVC tube 2A and the front surface. ing.

  As shown in FIG. 8, in this embodiment, a circular opening that guides the cylindrical portion 53 of the pusher 52 in the radial direction is used as a pusher loading / unloading device 51 that is a thrust support protrusion / storage mechanism for protruding / retracting the pusher 52. A pusher case 55 having a pusher case, a pusher case presser fitting 57 for fixing the pusher case 55 to a support base 56 fixed to the inner tube 12, and an insertion hole 58 provided in the pusher case 55. A guide roller body 60 that is inserted and held, and a retracting rod 66 that is a storage operation portion having a guide groove 65 into which an inner roller 61 of the guide roller body 60 is inserted are provided. As described above, the pusher 52 is protruded or stored in the radial direction via the guide roller body 60 by the guide groove 65 of the pull-back rod 66 serving as the storage operation portion.

  The joint 3 of the PVC pipe 2 with which the pusher 52 engages is provided with the collar 5 and the sealing material 6 on the outer periphery thereof, so that ground water or the like enters the joint 3 of the PVC pipe 2 from the ground 207. Is prevented.

  On the other hand, the guide groove 65 provided in the pull-back rod 66 is forward-facing from the outside so that the right side of the drawing as the starting side is located radially outward and the left side of the drawing as the reaching side is located radially inside. Inclined inward. Further, the support base 56 is provided with a cylindrical space 62 in which the cylindrical portion 53 of the pusher 52 is stored in the radial direction of the inner tube 12.

  The pull-back rod 66 is provided so as to be movable in the propelling direction of the inner tube 12 between the support bases 56 fixed to the outside of the inner tube 12, and a guide provided on the outer surface of the inner tube 12. The ring 63 (FIG. 1) is provided so as to be movable in the propulsion direction. The pull-back rod 66 is provided so as to penetrate the lower part of the pusher case 55 and the pusher 52 in the propulsion direction, is divided in the propulsion direction like the inner pipe 12, and is on the start side close to the coupling portion of the inner pipe 12. In this position, a thin insertion portion 68 formed at the rear end of the front pull-back rod 66 is inserted into a U-shaped portion 69 formed at the front end of the rear pull-back rod 66 and provided at this insertion position. The hole 70 and the long hole 71 are connected by a pin 67 (see FIG. 7B).

  As the connecting position of the pins 67 in the connecting portion of the pull-back rod 66, an excessive pull-back force is required if the pushers 52 are to be retracted all at once, so as shown in FIG. By making the elongated hole 71 of the insertion portion 68 formed at the end into an elongated hole in which the play in the propulsion direction increases in order from the starting side, the pulling rod 66 on the front side is pulled even when the pulling rod 66 on the starting side is pulled. Are not drawn by the amount of play, and are stored with a time difference in order from the pusher 52 on the start side. That is, by the play in the propulsion direction in the hole portion 70 that engages with the pin 67, only the pulling-back rod 66 is pulled to the starting side by the pulling of the pulling-back rod 66, and the starting-side pusher 52 is stored. The play of the elongated hole 71 in the connecting portion of the pull-back rod 66 on the front side in the propulsion direction is eliminated in order, and the pull-back rod 66 connected in order from the start side is pulled, so that the inner tube 12 side in order from the pusher 52 on the start side. To be stored. Thereby, the number of pushers 52 stored simultaneously is reduced, and the pulling force of the pull-back rod 66 is reduced.

  As shown in FIGS. 9 (a) and 9 (b), according to the thrust support portion 50, when the pusher 52 is protruded and engaged with the PVC pipe 2, the propulsion resistance loaded by the PVC pipe 2 is reduced. The inner pipe 61 is supported by the inner pipe 12 at the position 52 (FIG. 9 (a)). After the PVC pipe 2 is buried, the inner roller 61 of the guide roller body 60 is pulled by the pulling rod 66 by pulling the pulling rod 66 toward the start shaft. The pusher 52 is guided by the pusher case 55 by being guided by the guide groove 65 and stored in the radially inner side of the inner tube 12, and the outer roller 59 of the guide roller body 60 is engaged with the storage. The data is forcibly stored on the side 12 (FIG. 9B). By such an operation, the pusher 52 can be retracted and stored from the start side to a position where it does not interfere with the inner diameter portion of the PVC pipe 2. The pusher 52 is retracted in such a manner that the pusher 52 is guided by the pusher case 55 and stored in the radial direction, and the engaging portion 54 of the pusher 52 is retracted to a position where it does not interfere with the inner surface of the PVC pipe 2.

  Therefore, according to the synthetic resin pipe embedding device 120 provided with such a thrust support portion 50, as shown in FIG. 10, the engagement concave portion provided from the inner pipe 12 to the joint portion 3 of the PVC pipe 2. By pushing the pusher 52 toward 9 and engaging it, a propulsive force for propelling the PVC pipe 2 on the front side of the position where the pusher 52 is provided is applied to the inner pipe 12 via the pusher 52, The propulsion resistance force of the front PVC pipe 2 can be prevented from being loaded by the PVC pipe 2 installed on the rear side.

  In other words, the propulsive force required for propelling the PVC pipe 2 is not transmitted only by the main pushing device 203 (FIG. 10), but the propulsive force of the PVC pipe 2 is placed in the position before reaching the allowable propulsive force of the PVC pipe 2. By providing the thrust support portion 50 supported by the pipe 12, when the PVC pipe 2 is embedded, the propelling force of the PVC pipe 2 is loaded by the inner pipe 12 at a predetermined interval so that the PVC pipe 2 is in a certain length unit. The propulsive force to be applied is limited, and the PVC pipe 2 is used within the allowable propulsive force range so that long distance propulsion is possible. As a result, the construction distance limited by the low strength of the PVC pipe 2 can be extended to the construction distance by the allowable propulsive force of the inner pipe 12 having high strength.

  In this embodiment, the pusher 52 is provided at the upper and lower positions of the inner pipe 12 so as to load the propulsive force of the PVC pipe 2 above and below the inner pipe 12. By the support in the left and right direction by the spacers 32 provided on both sides, the load of the propulsion force by the pusher 52 placed up and down even when the excavator 205 is bent and the support by the spacer 32 by the force in the left and right direction. Therefore, the transmission of the thrust of the PVC pipe 2 at the time of bending can be stably performed.

  FIGS. 11A and 11B are drawings showing a lubricant injection part of the synthetic resin pipe embedding device shown in FIG. 1, wherein FIG. 11A is an axial sectional view, and FIG. 11B is a plan view. In the plan view, the collar 5 and the sealing material 6 are omitted. 12 is a perspective sectional view showing the lubricant injection portion shown in FIG. 11, FIG. 13 is a sectional view taken along XIII-XIII shown in FIG. 11, and FIG. 14 is an example of a check mechanism in the lubricant injection portion shown in FIG. FIG. 15 is a cross-sectional view showing another example of a check mechanism in the lubricant injection portion shown in FIG. The synthetic resin pipe embedding device 120 includes a lubricant injection part 80 at a predetermined position in the propulsion direction in order to enable long-distance propulsion.

  As shown in FIGS. 11 and 12, the lubricant injection part 80 provided in the synthetic resin pipe embedding device 120 is provided at a predetermined position of the PVC pipe 2 having a predetermined length coupled in the propulsion direction as described above. The peripheral surface friction force between the outer surface of the PVC pipe 2 and the ground is required to be reduced. The lubricant injection portion 80 is provided at the upper portion of the inner pipe 12 and is disposed at a position close to the inner surface of the PVC pipe 2 and is in contact with the lubricant injection opening 7 provided in the PVC pipe 2. An injection pipe 81, and a lubricant injection pipe support fitting 83 which has a non-rotating portion 82 which engages with the polyvinyl chloride pipe 2 to prevent rotation and is protruded or stored in the radial direction of the polyvinyl chloride pipe 2. A lubricant injection pipe support fitting case 84 for guiding the lubricant injection pipe support fitting 83 in the radial direction of the polyvinyl chloride pipe 2, and the lubricant injection pipe support fitting case 84 fixed to a support base 85 fixed to the inner pipe 12. A case holder 86, a guide roller body 89 in which an external roller 88 is inserted into an insertion hole 87 provided in the lubricant injection pipe support fitting 83, and an inner roller 90 of the guide roller body 89 are inserted. A storage operation portion having a guide groove 65 A pullback rod 66, the lubricant injection pipe 81 groundwater from the exterior to the interior of the PVC tube 2 facing the distal end of the non-return mechanism 100 (110) for preventing that the entering is provided. The sliding material injection tube support fitting 83 has a cylindrical portion 91 formed on the inner tube side, and the anti-rotation portion 82 protruding from the outside. The support base 85 is provided with a cylindrical space 92 in which the cylindrical portion 91 of the lubricant injection pipe support fitting 83 is stored in the radial direction of the PVC pipe 2.

  As shown also in FIG. 13, in this embodiment, the lubricant serving as a lubricant injection projecting / retracting mechanism for projecting or storing the lubricant injection tube support fitting 83 that projects or retracts integrally with the lubricant injection tube 81 is provided. Similar to the thrust support protrusion / retraction mechanism, the injection pipe support device 83 projects the lubricant injection pipe support fitting 83 in the radial direction via the guide roller body 89 by the guide groove 65 of the retracting rod 66 serving as the storage operation portion. A mechanism for storing is adopted.

  The non-rotating portion 82 that engages with the PVC pipe 2 is for making it difficult for the relationship between the lubricant injection position and the PVC pipe 2 to shift, and the rear of the PVC pipe 2 provided with the lubricant injection portion 80. It engages with an engagement recess 10 formed at the end to prevent rotation.

  The collar 5 and the sealing material 6 are provided on the outer periphery of the PVC pipe 2 with which the lubricant injection pipe support fitting 83 is engaged, as in FIGS. A working collar 8 is provided. An injection path 93 (see FIGS. 14 and 15) that opens rearward is provided between the collar 8 for the lubricant and the collar 5, and is propelled from the gap between the collar 8 for the lubricant and the collar 5. Lubricant can be supplied between the PVC pipe 2 and the natural ground 207 at the rear of the direction. Intrusion of groundwater or the like from the natural ground 207 is prevented by the check mechanism 100 (110) and the sealing material 6.

  In this embodiment, the pull-back rod 66 has the same configuration as the pull-back rod 66 that causes the pusher 52 to project / store. The pull-back rod 66 is provided so as to penetrate the lower part of the lubricant injection pipe support fitting case 84 and the lubricant injection pipe support fitting 83 in the propulsion direction, and is divided in the propulsion direction in the same manner as the inner pipe 12. A thin insertion portion 68 formed at the rear end of the front pull-back rod is inserted into a U-shaped portion 69 formed at the front end of the rear pull-back rod at a position close to the coupling portion of the tube 12. The provided hole portion 70 and the long hole 71 are connected by a pin 67 (see FIG. 7B).

  Therefore, when the pull-back rod 66 is pulled to the start side, the lubricant injection pipe support fitting 83 is stored on the inner pipe 12 side along with the guide roller body 89 along the guide groove 65 provided in the pull-back rod 66. The storage of the lubricant injection pipe support fitting 83 is guided by the lubricant injection pipe support fitting case 84 and stored in the radial direction, and the anti-rotation portion 82 of the lubricant injection pipe support fitting 83 interferes with the inner surface of the PVC pipe 2. It can be stored up to the position where it does not. This operation is the same operation as the pusher 52 shown in FIGS. 9A and 9B described above, and detailed description thereof is omitted. Thus, the lubricant injection pipe support fitting 83 stored in the radial direction allows the lubricant injection pipe 81 to be stored integrally with the lubricant injection pipe support fitting 83 to a position where it does not interfere with the inner surface of the PVC pipe 2. I am doing so.

  On the other hand, a positioning portion 96 to be inserted into an insertion hole 95 provided in the lubricant injection pipe support fitting 83 is provided at the tip of the lubricant injection pipe 81, and the PVC pipe 2 is orthogonal to the positioning section 96. The above-mentioned lubricant injection pipe 81 is provided in the radial direction. The positioning portion 96 is inserted into the insertion hole 95 and protrudes / stores in the radial direction integrally with the lubricant injection tube support fitting 83. In the lubricating material injection pipe support fitting 83, the inner roller 90 of the guide roller body 89 externally locked to the lubricating material injection pipe support fitting 83 is axially oriented with the pull-back rod 66 directed toward the start side of the inner pipe 12. Since the guide roller body 89 retracts the lubricant injection pipe support 81 together with the lubricant injection pipe support fitting 83, the lubricant injection pipe 81 slides along the guide groove 65 provided in the pull-back rod 66. It is stored in the inner pipe side to the position where it does not interfere with the PVC pipe 2 along the material injection pipe support fitting case 84.

  As shown in FIGS. 14 and 15, as the non-return mechanism 100 (110) for preventing intrusion of groundwater or the like at the tip of the lubricant injection pipe 81, the tip of the lubricant injection pipe 81 from the outside of the PVC pipe 2 is used. A mechanism is employed that prevents groundwater and the like from entering the inside of the PVC pipe 2 through the section.

  The non-return mechanism 100 shown in FIG. 14 adheres and fixes the sealing case 101 with which the front-end | tip of the said lubricant injection pipe | tube 81 contact | adheres to the PVC pipe 2, and seals between the seal case 101 and the lubricant injection pipe | tube 81. A material 102 is provided and sealed. In addition, an inclined hole 103 whose outer diameter is increased so as to have a conical partial cross-sectional shape is provided at the center of the seal case 101, and a conical seal packing 104 is provided in the inclined hole 103. This seal packing 104 is moved to the outside by the injection pressure when injecting the lubricant from the lubricant injection pipe 81 side and opens between the inclined holes 103 so that the lubricant is injected to the outside of the PVC pipe 2. Allowing ingress of groundwater or the like from the outside is prevented by sealing between the conical inclined hole 103.

  Further, on the outside of the seal packing 104, the above-mentioned lubricant collar 8 is provided so that earth pressure or the like from the natural ground does not act directly, and the PVC pipe 2 is interposed between the lubricant collar 8 and the collar 5. An injection path 93 for supplying a lubricant is formed between the ground and the natural ground 207. Further, the collar 5 is provided with openings 105 at both outer ends of the seal packing 104, and the lubricant is injected from the openings 105 into the injection path 93.

  On the other hand, the non-return mechanism 110 shown in FIG. 15 adheres and fixes the seal case 111 with which the tip of the lubricant injection pipe 81 abuts to the polyvinyl chloride pipe 2, and between the seal case 111 and the lubricant injection pipe 81. Is provided with a sealing material 112 for sealing. An injection hole 113 that penetrates between the lubricant injection tube 81 side and the outside is provided in a substantially central portion of the seal case 111, and a circular seal packing 114 that closes the outside of the injection hole 113 is provided outside the injection hole 113. The periphery of the seal packing 114 is fixed to the seal case 111, and an opening 115 is provided at a position shifted laterally from the injection hole 113. According to such seal packing 114, when the lubricant is injected from the side of the lubricant injection pipe 81, the lubricant is deformed outward by the injection pressure, and the lubricant is externally attached to the exterior of the PVC pipe 2 from the injection hole 113 through the opening 115. The seal packing 114 is in close contact with the injection hole 113 to prevent intrusion of groundwater or the like from the outside.

  Further, the sliding material collar 8 is provided outside the seal packing 114 so that earth pressure or the like from the natural ground does not act directly, and a PVC pipe is provided between the sliding material collar 8 and the collar 5. An injection path 93 for supplying a lubricant is formed between the ground 2 and the natural ground 207. The collar 5 is provided with an opening hole 116 outside the opening 115 of the seal packing 114, and the lubricant is injected into the injection path 93 from the opening hole 116. Whether to use the check mechanism 100 shown in FIG. 14 or the check mechanism 110 shown in FIG. 15 may be determined according to the use conditions and the like. Further, the check mechanism may have a configuration other than these check mechanisms.

  As a position where the above-mentioned lubricant injection part 80 is provided, for example, the inner pipe 12 provided with the lubricant injection part 80 is installed at a position where the PVC pipe 2 is propelled about 100 m. By providing the lubricant injection part 80 in this way, in the case of short-distance construction of 100 m or less, if the lubricant injection part (not shown) is mounted on the excavator 205, it is between the PVC pipe 2 and the natural ground 207. The propulsion between the PVC pipe 2 and the natural ground 207 can be reduced by injecting the lubricant from the lubricant injection part 80 provided in the PVC pipe 2 even in long distance construction. Resistance can be reduced.

  Further, by adopting such a structure, after embedding the PVC pipe 2, the pulling rod 66 is pulled toward the starting side, so that the lubricant injection pipe 81 is connected to the inner diameter portion of the PVC pipe 2 in the same manner as the pusher 52. The position can be reduced in the radial direction to a position where it does not interfere, and the lubricant injection part 80 can be collected on the start shaft side.

  Further, when the lubricant injection pipe 81 is radially contracted from the PVC pipe 2, the check mechanism 100 (110) provided between the lubricant injection pipe 81 and the outside of the PVC pipe 2 is provided in the PVC pipe 2. It is left and it can prevent that groundwater etc. permeate into the inside from the exterior of the polyvinyl chloride pipe 2.

  According to the synthetic resin pipe embedding device 120 as described above, as shown in FIG. 10, the pusher 52 provided at predetermined intervals in which the peripheral frictional force of the PVC pipe 2 is within the proof stress range of the PVC pipe 2 is used during propulsion. Since the end face of the PVC pipe 2 is directly pressed, a certain thrust resistance corresponding to the pressure receiving area of the pusher 52 can be applied by the inner pipe 12. The position where the pusher 52 is provided can also be easily determined from the pressure receiving area of the pusher 52 × the allowable compressive stress of the PVC pipe. Therefore, it is possible to easily perform the construction management for determining the number of the pushers 52 for each of the PVC pipes 2. In addition, the pusher 52 has a structure that moves in the circumferential direction so that it can follow even if the pushing surface of the PVC pipe 2 is tilted, so that stable thrust support can be achieved.

  Moreover, since the hollow space 28 of the inner pipe 12 is a laser passage area as a space where piping and wiring are not arranged, a reliable laser passage area can be secured and accurate measurement can be performed with respect to the omnidirectional change of the excavator 205. Is possible. In addition, by securing a laser passage area at the center of the inner pipe 12, various devices, pipes, and wiring can be installed at arbitrary locations on the entire circumference of the inner pipe 12.

  Further, the inner pipe 12 is supported by the PVC pipe 2 (synthetic resin pipe) in the vertical and horizontal directions by the support roller 31 provided at the vertical position and the spacer 32 provided at the horizontal position. Therefore, buckling that may occur in all directions of the inner pipe 12 by these support points can be prevented.

  After the PVC pipe 2 is completely buried, the inner pipe 12 pulls the pull-back rod 66 toward the starting side as described above, so that the pusher 52 and the lubricant injection pipe support fitting 83 do not interfere with the PVC pipe 2. Since it can be easily stored up to the position on the side, the operation of collecting the inner pipe 12 to the start shaft side can be performed stably. Moreover, the support roller 31 serving as the upper and lower support points of the inner pipe 12 reduces the resistance when the inner pipe 12 is withdrawn from the PVC pipe 2 (synthetic resin pipe) to the start shaft side. The collection work is further facilitated.

  In addition, the predetermined space | interval which arrange | positions the thrust support part 50 and the lubricating material injection | pouring part 80 in the said embodiment is determined according to the geology and environment which embed the PVC pipe 2, and when it is provided at fixed intervals. It is not limited.

  Moreover, although the muddy water type excavator 205 has been described as an example in the above embodiment, the excavator 205 may be determined according to the geology and the like, and is not limited to the above embodiment.

  Furthermore, the above-described embodiment shows an example, and various modifications can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiment.

  The synthetic resin pipe embedding device according to the present invention can be used when a pipe having a diameter of about 300 mm such as a sewer pipe is to be buried for a long distance.

1 ... Normal joint
2 ... PVC pipe
DESCRIPTION OF SYMBOLS 3 ... Coupling part 9,10 ... Engagement recessed part 12 ... Inner pipe | tube 13 ... Coupling part 14,16 ... Positioning metal fitting 19 ... Fastening metal fitting 21 ... Fastening metal fitting holding part 22 ... Lateral connection plate 23 ... Vertical connection plate 28 ... Space 31 ... support roller 32 ... spacer 37 ... feed / mud pipe support 41 ... mud pipe 42 ... drain pipe 43 ... power line 45 ... joint part 50 ... thrust support part 51 ... pusher entry / exit device (thrust support projection / storage mechanism)
52 ... Pusher 53 ... Cylindrical part 54 ... Engagement part 55 ... Pusher case 59 ... External roller 60 ... Guide roller body 61 ... Inner roller 65 ... Guide groove 66 ... Retraction rod (retraction operation part)
67 ... Pin 70 ... Hole 71 ... Slot 80 ... Lubricant injection part 81 ... Lubricant injection pipe 82 ... Anti-rotation part 83 ... Lubricant injection pipe support fitting 84 ... Lubricant injection pipe support fitting case 88 ... External roller 89 ... Guide roller body 90 ... Inner roller 91 ... Cylindrical part 94 ... Sliding material injection tube entry / exit device (lubricant injection protrusion / storage mechanism)
DESCRIPTION OF SYMBOLS 100 ... Check mechanism 101 ... Seal case 104 ... Seal packing 110 ... Check mechanism 111 ... Seal case 114 ... Seal packing 120 ... Synthetic resin pipe embedding device

Claims (7)

A synthetic resin pipe of a predetermined length that is buried in the ground to be excavated by the excavator that gives propulsive force with the main pushing device and is coupled in the propulsion direction, and disposed inside the synthetic resin pipe in the propulsion direction of the excavator A synthetic resin pipe embedding device comprising an inner pipe having a predetermined length for transmitting a propulsive force to the excavator by being coupled,
The inner pipe has a coupling portion that couples the inner pipe in a refractive manner, and a pusher that loads the propelling force of the synthetic resin tube at a predetermined interval that is within the allowable propulsive force range of the synthetic resin tube,
The synthetic resin pipe has a rear end face that engages the pusher with a coupling portion of the synthetic resin pipe coupled in a propulsion direction;
The inner pipe projects a push force for propelling the synthetic resin pipe by projecting the pusher in a radial direction intersecting the propulsion direction and engaging with a rear end surface of the coupling portion of the synthetic resin pipe. A thrust receiving protrusion and a storage mechanism for storing the pusher toward the inner tube and separating the pusher from the synthetic resin tube;
The thrust support protrusion / storage mechanism includes a pull-back rod that holds the pusher in a protruding state and stores the pusher in a radial direction toward the inner pipe .   The synthetic resin pipe embedding device according to claim 1, wherein the inner pipe is formed of a pipe body having a space penetrating in the axial direction. The pusher synthetic resin pipe embedded device according to claim 1 or 2 are arranged at upper and lower positions of the inner tube. The synthetic resin pipe embedding device according to any one of claims 1 to 3, wherein the pull-back rod has a function of storing the pusher by providing a time difference in order from the end side. The synthetic resin pipe embedding device according to any one of claims 1 to 4 , wherein the inner pipe includes a lubricating material injection portion that injects a lubricating material to the outside of the synthetic resin pipe. The lubricant injection part engages with the synthetic resin pipe in a state of projecting in the radial direction, and a lubricant injection pipe that is detached from the synthetic resin pipe in a state of being stored in the radial direction; Protruding toward the synthetic resin tube from the outside of the inner tube, or a lubricant injection projecting and storing mechanism for storing toward the inner tube,
The synthetic resin pipe is capable of injecting a lubricating material from the lubricating material injection pipe to the outside of the synthetic resin pipe at a lubricating material injection position of the lubricating material injection pipe, and preventing a reverse flow from the outside of the synthetic resin pipe. The synthetic resin pipe embedding device according to claim 5 provided with a mechanism. The lubricant injection projecting / retracting mechanism has a rotation stopper portion that stops the lubricant injection pipe at a predetermined position in the circumferential direction of the synthetic resin pipe, and the inner pusher side of the inner pipe coupled to the propulsion direction of the excavator The synthetic resin pipe embedding device according to claim 6 , further comprising a pull-back rod for storing the detent portion.

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