JP2006200303A - Underground pipe jacking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underground pipe jacking device capable of realizing jacking by a specified stroke by one time of cylinder operation in a small-sized device. <P>SOLUTION: This underground pipe jacking device comprises base rails 11 and 12 installed on a base 1, a slide part 2 mounted on the base so as to be advanced and retreated along the base rails, jacking rails 71 and 72 installed on the slide part, a jacking part 3 installed on the base so as to be advanced and retreated along the rails, first actuators 24 and 25 interposed between the base and the slide part, and second actuators 31 and 32 interposed between the slide part and the jacking part. The base rails and the jacking rails are disposed parallel with each other. In the second actuators, their body parts are held to be passed through by the jacking parts. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is an apparatus for use in a construction in which a buried pipe such as a vinyl chloride pipe is buried between a start shaft and a destination shaft that have been excavated in advance, and rotates a small-diameter leading conduit or an auger screw. The present invention relates to a device for propelling buried pipes and propelling buried pipes.

  In the construction of embedding sewage pipes or the like in the ground, it is known that after excavating a position to be buried, sewage pipes are arranged with a predetermined gradient and the excavated portion is backfilled. However, on roads with heavy traffic, long-term construction hindered traffic, causing inconvenience to neighboring residents and passers-by. Therefore, recently, after surveying the place where the sewage pipe etc. should be buried, a shaft is provided in advance at the start point and end point of the buried position, and from the start point shaft (this is called the start shaft) to the end shaft (this is the destination shaft) The construction method that promotes the underground toward the) is adopted.

The present invention relates to a propulsion device used in the construction method as described above, but the conventional propulsion device is propelled by a pushing stand provided to be movable forward and backward with respect to the base, In this configuration, the advancing / retreating is operated by hydraulic cylinders arranged on both sides of the pushing table (see Patent Documents 1, 2, and 3).
Japanese Utility Model Publication No. 7-4592 Japanese Utility Model Publication No. 6-49595 Japanese Patent Laid-Open No. 10-46984

  In the above prior arts, two hydraulic cylinders of the same type that both expand and contract at the same time are provided, and they are arranged symmetrically around the position where the buried pipe to be propelled is mounted. However, since the propulsion device is installed in the starting shaft and works in a limited space, the hydraulic cylinder cannot be made large, and as a result, a relatively small hydraulic cylinder with a shortened stretchable stroke length is used. By repeating the expansion and contraction a plurality of times, the predetermined length is promoted.

  For this purpose, the hydraulic cylinder is mounted on the pushing table, and a clamp is provided at the tip of the piston part of the cylinder so that it can be locked to and released from the rail of the base. The first stage of propulsion is performed by extending the cylinder after being locked to the base rail by, and the clamp is moved to the pushing base by releasing the lock at the tip of the piston and contracting the cylinder. The tip of the piston is re-engaged with the base rail, the cylinder is extended, and the second stage propulsion is performed, and the desired stroke length is propelled by the second or third stage propulsion.

  However, in the device that is propelled in a plurality of times as described above, each time the propulsion is completed, the piston portion is released from being locked by the clamp and moved to the vicinity of the pushing table that has moved the piston tip. As a result, reliable propulsion can be realized, but it takes time to reach the desired stroke. Therefore, a propulsion device that can achieve a desired stroke propulsion by a single cylinder operation has been desired. On the other hand, in order to realize a desired stroke propulsion by a single cylinder operation, it is devised that a large hydraulic cylinder is used. As described above, the propulsion device operated within the limited start shaft is large. It was virtually impossible to use a hydraulic cylinder.

  The present invention has been made in view of the above-mentioned various points, and an object of the present invention is to provide a buried pipe propulsion device capable of realizing a desired stroke propulsion by a single cylinder operation in a small device. .

  Therefore, the present invention provides a base rail provided on the base, a slide portion mounted so as to be movable back and forth along the base rail, a propulsion rail provided on the slide portion, and along the rail. A propulsion unit provided so as to be able to advance and retreat, a first actuator interposed between the base and the slide unit, and a second actuator interposed between the slide unit and the propulsion unit, The embedded pipe propulsion device, wherein the base rail and the propulsion rail are arranged in parallel, and the second actuator is a second actuator having its main body portion being passed through the propulsion portion. Is the gist.

  Since it is such a configuration, by operating the first actuator, the slide part can be advanced and retracted along the base rail, and by operating the second actuator, the propulsion part along the propulsion rail Will be able to advance and retreat. Therefore, when the propulsion unit is moved forward, it can be moved within the range where both the first and second actuators are operated with reference to the base, and when moving backward, the actuator is operated by operating both actuators. It can be restored.

  In the above invention, the base rail can be constituted by two parallel rails with the reference surfaces facing upward on both sides of the region where the propulsion unit should advance and retreat. It can be composed of two sliding contact portions that are individually slidably contacted with the surface, and a slide main body that is arranged in the middle of both slidable contact portions and continues the slidable contact portions. About an actuator, it can be set as the structure installed in the sliding contact part of the said slide part above the reference plane of the said base rail. With such a configuration, when the first actuator applies a driving force in the forward / backward direction to the sliding contact portion of the slide portion, the forward / backward direction is regulated by the two parallel base rails. The Rukoto.

  Further, in the above invention, the slide body can be continuously provided near the rear end of the sliding contact portion and can be further extended rearward. The sliding contact portion is mutually connected with respect to the propulsion rail. It can be set as the structure formed in the position which opposes. With such a configuration, the propulsion unit can be disposed in the vicinity of the rear portion of the base in a state where the first and second actuators are contracted. Further, since the propulsion rail can be provided close to the base rail, the reaction force acting on the slide portion can be distributed to the base rail when the propulsion unit is advanced or retracted.

  Furthermore, in the said invention, about the said base, it can be set as the structure which has a bottom rail parallel to this base rail inside and below the said base rail comprised by two, About the said slide part When the sliding contact portion is in sliding contact with the reference surface of the base rail, the lower end edge of the slide main body can be configured to contact the bottom rail. By setting it as such a structure, a slide contact part will be controlled by a base rail, a slide main body will be controlled by a bottom part rail, and the attitude | position of a slide part can be stabilized.

  Further, according to the present invention, in the embedded pipe propulsion device in which the propulsion unit that moves forward and backward on the base supports the end portion of the embedded pipe and rotatably supports the leading conduit or the auger screw, the propulsion unit moves forward and backward. Two base rails provided on the base separately on both sides of the region to be formed, a slide portion mounted so as to be able to advance and retreat along the base rail, and an intermediate between the slide portion and the base A propelling rail provided on the slide portion to restrict the advancing / retreating direction of the propelling portion when the propelling portion is advanced and retracted from the slide portion as a starting point, and the base At least one bottom rail provided at the bottom of the base rail and a second actuator interposed between the slide portion and the propulsion portion, and the slide Is a slide part that is arranged so that the lower part thereof is in sliding contact with the bottom rail, holds the main body part of the first actuator, and is connected to the operation part of the second actuator. The buried pipe propulsion device is also summarized.

  Since it is such a structure, since a slide part is controlled by the base rail in the both sides and lower part of the area | region where a propulsion part should advance and retreat, it can maintain the positional relationship closely related with a base, Can serve as a standard for promotion. Since the slide portion holds the main body portion of the first actuator, the operation portion is fixedly connected to the base so that the slide portion can be advanced and retracted by the operation of the actuator. Further, the operating portion of the second actuator is fixedly connected to the slide portion, so that when the second actuator is operated, the propelling portion can be advanced and retracted based on the slide portion.

  In the above invention, with respect to the second actuator, of the front surface of the propulsion unit, two actuators are arranged symmetrically around a position where the buried pipe, the leading conduit or the auger screw should be supported, and the main body It can be set as the structure provided so that may penetrate the propulsion part. With such a configuration, first, when the propulsion unit is advanced by the second actuator, the driving force to be applied to the buried pipe or the like can be equally borne. Therefore, the reaction force against the slide portion that functions as a reference for propulsion also acts equally. Further, since the main body portion of the actuator penetrates the propulsion portion, the propulsion portion can be brought close to the slide portion when the actuator is contracted. In addition, the actuator can be designed with the length of the actuator overlapped by the thickness of the propulsion unit in the advancing / retreating direction, so that the dead space caused by using the second actuator can be reduced.

  Further, in the above invention, the base rail can be composed of two parallel pieces arranged with reference surfaces facing upward on both sides of the region where the propulsion unit should advance and retreat. Two sliding contact portions that are individually slidably contacted with the reference surface of the base rail, and arranged between the two slidable contact portions to make the slidable contact portions continuous, and the lower end is slidably contacted on the bottom rail. In addition, the first actuator may be configured to be laterally provided on the sliding contact portion of the slide portion above the reference surface of the base rail. With such a configuration, the slide portion can be advanced and retracted faithfully along the slide rail at the base rail and the slide body along the bottom rail.

  Furthermore, in the above invention, the slide main body can be continuously provided in the vicinity of the rear end of the sliding contact portion and can be configured to project further rearward. It can be set as the structure formed in the position which opposes. With such a configuration, the propulsion unit can be moved back to the vicinity of the rear portion of the base in a state where the first actuator is contracted. Further, since the propulsion rail is formed in the sliding contact portion of the slide portion, the reaction force acting on the propulsion portion during propulsion can be distributed to the base via the base rail.

  The first actuator is arranged so that its axis is at the same height as the position where the buried pipe, the leading conduit or the auger screw should be supported, and the propulsion rail has the center line of the first actuator. By forming the actuator so that it is at the same height as the axial center of the actuator, when driving only the first actuator and applying propulsive force, the two actuators on both sides evenly distribute the driving force that should act on the buried pipe etc. It will be borne. The reaction force generated when propelling directly acts on the slide part, but the force for supporting the slide part is efficiently achieved by the first actuator acting in the direction parallel to the propulsion rail. Will be granted.

  According to the present invention, by operating the first actuator and the second actuator simultaneously or sequentially, the slide part moves forward along the base rail, and the propulsion part moves along the propulsion rail of the slide part. The propulsion unit that supports the embedded pipe or the auger screw can be advanced to a predetermined position by moving forward. Thereby, the propulsion of the desired stroke is realized. Each of these actuators can be operated by a single operation.

  Further, according to the present invention, even when the propulsion unit is moved backward after propulsion of the buried pipe or the like, it can be realized by a single operation. That is, by contracting the first and second actuators, the propulsion unit moves back to a predetermined position along the propulsion rail of the slide unit, and the slide unit moves back to a predetermined position along the base rail. As a result of combining the two types of retreat, the original state can be restored.

  Furthermore, in the invention in which the bottom rail is formed at the bottom of the base, the posture of the most unstable slide part located between the base and the propulsion part can be stabilized. That is, since the base is installed in the start shaft, the position thereof is stabilized, and the propulsion unit is regulated in posture by press-fitting a buried pipe or an auger screw to be supported into the ground. The slide part is located between the base and the propulsion part, and may become unstable due to the propulsive force and reaction force received from both, but the bottom rail regulates the slide at a position away from the base rail and the propulsion rail. The posture of the part is stabilized.

  By providing the second actuator so that it is symmetrical about the position where the buried pipe is supported, the propulsive force when the propulsion unit propels the buried pipe etc. is evenly applied by the second actuator. Will be. In addition, by continuously configuring the slide body near the rear end of the sliding contact portion where the first actuator is provided, the slide portion can be retracted to the vicinity of the rear end of the base. The propulsion unit can be advanced with the vicinity of the rear end of the base as a base point, and the moving distance of the propulsion unit is increased. Thereby, propulsion of a desired stroke can be realized even though the propulsion device is small.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the buried pipe propulsion device of the present embodiment is composed of a base 1, a slide part 2, and a propulsion part 3, and the leading conduit 4, the auger screw 5, or the buried pipe 6 are simultaneously or individually. The buried pipe 6 is finally buried in the ground by moving the supported propulsion unit 3 back and forth.

  The base 1 is provided with parallel base rails 11 and 12 on both sides of a region in which the propulsion unit 3 advances and retreats, and the slide unit 2 advances and retreats along the rails 11 and 12. The slide portion 2 is provided with two slide contact portions 21 and 22 that can be brought into sliding contact with the base rails 11 and 12. The slide contact portions 21 and 22 have an integrated structure that is continuous with the slide body 23. .

  Here, as shown in FIG. 2, hydraulic cylinders 24 and 25 as first actuators are mounted on the sliding contact portions 21 and 22 of the slide portion 2, and the piston portions of the hydraulic cylinders 24 and 25 are mounted. The front ends 26 and 27 are fixedly connected to connecting portions 13 and 14 provided near the rear end of the base 1. Therefore, when the hydraulic cylinders 24 and 25 are expanded and contracted, the main body portions of the hydraulic cylinders 24 and 25 are advanced and retracted from the piston tips 26 and 27 as starting points. And by this advance and retreat, the sliding contact portions 21 and 22 change the distance from the connecting portions 13 and 14, thereby moving forward and backward along the base rails 11 and 12 of the base 1.

  Further, as described above, the sliding contact portions 21 and 22 constitute the slide portion 2 together with the slide main body 23, and the slide main body 23 further includes the propulsion portion while interposing the hydraulic cylinders 31 and 32 as the second actuators. 3 is supported. The hydraulic cylinders 31 and 32 are provided so that the main body portion penetrates the propelling portion 3, and the tip of the piston portion is connected to the slide main body 23. Therefore, when the second hydraulic cylinders 31 and 32 are expanded and contracted, the propulsion unit 3 including the main bodies of the hydraulic cylinders 31 and 32 can be moved forward or backward from the slide main body 23 as a starting point.

  As shown in FIG. 3, the slide part 2 has a slide main body 23 at the rear of the sliding contact parts 21 and 22 (see FIG. 3A). The sliding contact portions 21 and 22 are arranged on both sides around the slide main body 23 (see FIG. 3B). The upper portions of the sliding contact portions 21 and 22 are configured in a container shape that can mount the main body portions of the hydraulic cylinders 24 and 25, and the lower portion is a sliding contact that can be brought into sliding contact with the upper surfaces (reference surfaces) of the base rails 11 and 12 (FIG. 1). A substantially C-shape including the contact surfaces 28 and 29 is formed. Further, propulsion rails 71 and 72 are provided at positions where the sliding contact portions 21 and 22 face each other. The propulsion rails 71 and 72 are configured such that a part of wall surfaces (wall surfaces common to the slide main body 23) constituting the sliding contact portions 21 and 22 are cut out in a straight line or a straight gap. By engaging the sliding contact portions 33 and 34 of the propulsion unit 3 described later with the propulsion rails 71 and 72, movement in the advancing and retreating direction is regulated while supporting the propulsion unit 3. Therefore, the propulsion rails 71 and 72 are provided in parallel with the base rails 11 and 12 described above, and the direction in which the slide portion moves along the base rails 11 and 12 and the propulsion unit 3 is the propulsion rails 71 and 72. The direction of movement along the line is matched. Further, the propulsion rails 71 and 72 are configured to have a sufficient length necessary for the propulsion unit 3 to advance and retreat (see FIG. 3A).

  Further, on both sides of the lower end of the slide main body 23 constituting the slide portion 2, contact portions 81 and 82 that contact the bottom rails 15 and 16 (FIG. 2) of the base 1 are provided. The contact portions 81 and 82 are provided on the lower surface of the bottom portion 85 of the wall surfaces 83 and 84 common to the sliding contact portions 21 and 22 and the slide body 23, and protrude below the bottom portion 85. Moreover, it is comprised by appropriate length in the direction in which the slide part 2 advances and retreats, and can contact | abut with respect to the bottom part rails 15 and 16 of the base 1 in sufficient range. Accordingly, the entire slide portion 2 mounted on the base 1 is supported by the slide contact portions 21 and 22 by the base rails 11 and 12 and the contact portions 81 and 82 by the bottom rails 15 and 16. Thus, the weight of the slide unit 2 and the propulsion unit 3 can be supported, and the posture of the slide unit 2 is stabilized.

  As shown in FIG. 4, the propulsion unit 3 includes sliding contact portions 33 and 34 that are formed in a substantially rectangular parallelepiped box and project on both sides. The slidable contact portions 33 and 34 are provided long along the direction in which the propulsion unit 3 advances and retreats (the width direction of the propulsion unit 3) (see FIG. 4B), and the propulsion rail of the slide unit 2 In this way, the forward and backward directions are restricted. In addition, spacers 35 a, 35 b, 36 a, and 35 b that slightly protrude from the propulsion unit 3 are provided above and below the sliding contact portions 33 and 34, and a predetermined amount is provided between the main body of the propulsion unit 3 and the slide unit 2. In this case, the inclination of the propulsion unit 3 in the horizontal plane is restricted and contact between the two is prevented.

  The propulsion unit 3 is provided with a hydraulic motor 91 and further includes a reduction gear (a chain line in FIG. 4B) to apply a rotational force to the connecting portion 92 of the leading conduit 4 and the auger screw 5. To do. Further, as shown in FIG. 4A, the second hydraulic cylinders 31 and 32 are provided so as to penetrate the propulsion unit 3, and the axial centers thereof are provided at symmetrical positions with the support unit 92 as the center. It has been. In this way, by not arranging the second hydraulic cylinders 31 and 32 in a line in the horizontal direction, the propulsive force is evenly applied from both sides of the connecting portion 92 to the connecting portion 92 where earth pressure resistance is concentrated during propulsion. In addition to being able to act, it is possible to secure a predetermined space around the connection portion 92, enabling the support portion 92 to be attached to the tip conduit 4, the auger screw 5, or the buried pipe 7, and the attachment / detachment work thereof to be easily performed. To do. In comparison, the first hydraulic cylinders 24, 25 are arranged side by side in the horizontal direction with the same axis as the support portion 92. This is because it is not necessary to attach or detach the leading conduit 4 or the like at the position where the first hydraulic cylinders 24 and 25 are provided. By making the same height as the support portion 92, the second hydraulic cylinders 24 and 25 are provided. This is to evenly bear the earth pressure resistance when propelled by the.

  Next, the operation | movement aspect of this embodiment is demonstrated. FIG. 5 is a diagram showing an outline of the advance and retreat of the slide unit 2 and the propulsion unit 3. The propulsion device of this embodiment is installed in advance in a start shaft (a circle with a chain line in FIG. 2). Then, as shown in FIG. 5A, the slide unit 2 and the propulsion unit 3 are moved rearward (right side in the drawing) of the apparatus, and the front conduit 4 and the oxygen gas are connected to the support unit 92 provided on the entire surface of the propulsion unit 3. A screw 5 or a buried pipe 6 is installed. At this time, the first hydraulic cylinders 24 and 25 and the second hydraulic cylinders 31 and 32 are both contracted (FIG. 5A).

  When the first hydraulic cylinders 24 and 25 are extended while the hydraulic motor 91 is operated if necessary after mounting the leading conduit 4 or the like selected according to the process, the slide portion 2 is attached to the base 1. It will move forward along the base rails 11 and 12. As the slide portion 2 advances, the propelling portion 3 also moves forward together with the slide portion 3 and is pushed into the ground from the tip of the attached front conduit 4 or the like (FIG. 5B). When the first hydraulic cylinders 24 and 25 are extended to the longest state, the forward movement by the hydraulic cylinders 24 and 25 is stopped.

  Subsequently, by extending the second hydraulic cylinders 31 and 32, only the propulsion unit 3 moves forward with reference to the slide unit 3 (FIG. 5C). At this time, the direction in which the propulsion unit 3 moves is regulated by the propulsion rails 71 and 72. However, since the propulsion rails 71 and 72 are parallel to the base rails 11 and 12, the slide unit 2 moves forward. The propulsion unit 3 moves forward in a state where the propulsion by the slide unit 2 is extended in the same direction as the movement direction.

  By moving the second hydraulic cylinders 31 and 32 to the longest state, the movement of the propulsion unit 3 by the second hydraulic cylinders 31 and 32 is stopped, and the propulsion process is ended. At this time, the total distance that the propulsion unit 3 moves is made to coincide with a desired stroke. That is, the first hydraulic cylinders 24 and 25 move the slide portion 2 by a distance corresponding to about two-thirds of the entire stroke, thereby propelling the propulsion portion 3 by the same distance relative to the base 1. . Further, only the propulsion unit 3 is moved by the second hydraulic cylinders 31 and 32 for the distance corresponding to the remaining one third.

  Next, the tip conduit 4 and the like are disconnected from the support portion 92 of the propulsion unit 3 and the propulsion unit 3 is moved backward. At this time, the second hydraulic cylinders 31 and 32 are contracted to retract the propulsion unit 3 to the slide unit 2, and further, the first hydraulic cylinders 24 and 25 are contracted to form the propulsion unit 3 together with the slide unit 2. 1 is moved backward to the vicinity of the rear end.

  Thereafter, the auger screw 5 to be propelled next is supported and the above propulsion and retreat are repeated, and the propulsion shaft is sequentially propelled. In the normal buried pipe propulsion method, the first step of blindly moving the leading conduit 4 from the starting vertical shaft to the reaching vertical shaft, the auger screw 5 is made continuous with the rear end of the leading conduit 4, and the auger screw 5 is connected to the embedded piping 6 And the second step in which the auger screw 5 and the buried pipe 6 are simultaneously propelled. The front conduit 4 has a direction correcting tip having an inclined tip, and is propelled while rotating in normal propulsion, and is propelled without rotating during direction correction. The extension pipe following the leading pipe uses a cylindrical steel pipe, and the long section from the starting shaft to the reaching shaft is continued by a single thin tube. After the leading pipe 4 reaches the reaching shaft, the auger screw 5 is guided while being excavated and propelled while being excavated, and extra tubes such as the leading pipe 4 are collected at the starting shaft. Furthermore, after the auger screw 5 and the buried pipe 6 reach the reaching shaft, only the auger screw 5 is pulled out and collected, and the piping is completed by the buried pipe 6 remaining in the ground. The pulling-out operation of the auger screw 5 also uses the propulsion device of this embodiment. The method of use is performed in the reverse process of the above propulsion.

  In the present embodiment, as described above, the first hydraulic cylinders 24 and 25 and the second hydraulic cylinders 31 and 32 are advanced and retracted in two stages. The reason for moving forward and backward by such a method is to enable a desired stroke by a single cylinder operation. That is, the propulsion unit 3 can be disposed in the vicinity of the rear portion of the base 1 in a state where both the first hydraulic cylinders 24 and 25 and the second hydraulic cylinders 31 and 32 are contracted, and the first This is because, after being moved by the hydraulic cylinders 24 and 25 (or simultaneously), the propulsion unit 3 can be moved to the tip of the slide unit 2, that is, to the vicinity of the tip of the base 1. For example, when the entire stroke is moved only by a single hydraulic cylinder 24, 25, the propulsion unit 3 can be moved only within a range in which the hydraulic cylinder 24, 25 can be extended. The movement range of the propulsion unit 3 is determined only by the positional relationship between the hydraulic cylinders 24 and 25 and the propulsion unit 3, and the range from the vicinity of the rear end of the base 1 to the vicinity of the tip cannot be moved. In other words, if the strokes of the single hydraulic cylinders 24 and 25 are set to a desired length, it is necessary to provide the base 1 with a large size, and accordingly, it is necessary to provide a large start shaft. It is.

  Although the configuration and operation mode of the present embodiment are as described above, various modes can be taken without departing from the spirit of the present invention. For example, in the above embodiment, the first hydraulic cylinders 24 and 25 and the second hydraulic cylinders 31 and 32 have been described with respect to the operation mode in which either one is expanded or contracted first and the other is expanded or contracted later. These may be operated simultaneously. That is, both hydraulic cylinders 24, 25, 31, and 32 are actuated at the same time even when either one is actuated by flowing a constant amount of oil from a single pressurizing device. However, there is no difference in the speed at which the propulsion unit 3 is moved, and when the resisting force such as earth pressure acts and the acting resisting force is different, the smaller resisting force moves forward. Only. This is particularly preferable in that a switching operation between the first hydraulic cylinders 24 and 25 and the second hydraulic cylinders 31 and 32 is unnecessary.

  In the above embodiment, a hydraulic cylinder is used, but other actuators may be used. In this embodiment, the hydraulic cylinders 24, 25, 31, and 32 are all two-stage cylinders (see FIG. 5C). This is because the length of the main body of the hydraulic cylinders 24, 25, 31, 32 is relatively short, but a long stroke can be expanded and contracted. For example, a stroke of 650 mm can be obtained by a hydraulic cylinder having a total length of 500 mm, and a stroke of 350 mm can be obtained by a 350 mm hydraulic cylinder. A stroke of 1000 mm can be obtained by combining the two types of hydraulic cylinders.

  Further, since the contact portions 81 and 82 provided at the lower portion of the slide body 23 are provided to stabilize the posture of the slide portion 2, the slide contact portions 21 and 22 are provided on the base rails 11 and 12. If the posture of the slide portion 2 is stabilized in a state where it is slidably contacted with the reference surface, it is not necessary to provide the lower contact portions 81 and 82. In this case, as a matter of course, the bottom rails 15 and 16 of the base 1 are also unnecessary.

  In the above embodiment, since the propulsion unit 3 is configured to advance and retreat in the center of the base 1, the base rails 11 and 12, the propulsion rails 71 and 72, the first hydraulic cylinders 24 and 25, and the second The hydraulic cylinders 31 and 32 are arranged on both sides of the propulsion unit 3. However, a single rail can be used as long as the propulsion force can be transmitted to the propulsion unit 3 without waste and the forward / backward direction can be regulated. Or you may comprise with a hydraulic cylinder.

  Further, in the present embodiment, the positional relationship between the propulsion rails 71 and 72 is not described in detail. However, when the propulsion unit 3 is mounted on the slide unit 2, the propulsion rails 71 and 72 support the propulsion unit 3. Preferably, the height is the same as 92. Also in this embodiment, as shown in FIG. 4A, the sliding contact portions 33 and 34 provided in the propulsion unit 3 are arranged at the same height as the support unit 92. Similarly, the propulsion rails 71 and 72 that should regulate the contact portions 33 and 34 have the same height as the support portion 92. Thus, by making the propulsion rails 71 and 72 the same height as the support portion 92, when the propulsion portion 3 propels against the earth pressure resistance, the resistance force acting on the support portion 92 causes the propulsion rails 71 and 72. Therefore, it is possible to avoid acting on the rails 71 and 72 and the sliding contact portions 33 and 34 with unnecessary loads.

It is a perspective view which shows embodiment of this invention. It is a top view of the embodiment of the present invention. (A) is a side view of a slide part, (b) is IIIB-IIIB sectional drawing. (A) is a front view of a propulsion part, (b) is a side view. It is explanatory drawing which shows the operation | movement aspect of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Slide part 3 Propulsion part 4 Leading conduit 5 Auger screw 6 Embedded pipes 11 and 12 Base rails 13 and 14 Connection parts 15 and 16 Bottom rails 21 and 22 Sliding contact parts 23 Slide bodies 24 and 25 First hydraulic pressure Cylinders 26, 27 Cylinder pistons 28, 29 Sliding contact surfaces 31, 32 Second hydraulic cylinders 33, 34 Sliding contact portions 35a, 35b, 36a, 36b Spacers 71, 72 Propulsion rails 81, 82 Abutting portions 83, 84 Wall surface 85 Slide body bottom 91 Hydraulic motor 92 Support part

Claims (9)

A base rail provided on the base, a slide portion mounted so as to be able to advance and retreat along this base rail, a propulsion rail provided on this slide portion, and provided so as to be able to advance and retreat along this rail A propulsion unit; a first actuator interposed between the base and the slide unit; and a second actuator interposed between the slide unit and the propulsion unit. The buried pipe propulsion device, wherein the rails are arranged in parallel, and the second actuator is a second actuator having a main body portion held through the propulsion portion. The base rail is a base rail composed of two parallel rails with the reference surface facing upward on both sides of the region where the propulsion unit should advance and retreat, and the slide portion is the two base rails A sliding portion composed of two sliding contact portions that are individually slidably contacted with the reference surface, and a slide main body that is disposed in the middle of the both slidable contact portions and continues the slidable contact portions. The buried pipe propulsion device according to claim 1, wherein the one actuator is a first actuator that is laterally provided on the sliding contact portion of the slide portion above the reference surface of the base rail. The slide main body is a slide main body that is continuously provided near the rear end of the sliding contact portion, and further protrudes rearward. The propulsion rail is located at a position where the sliding contact portions face each other. The buried pipe propulsion device according to claim 2, wherein the two propulsion rails are formed. The base is a base having a bottom rail parallel to the base rail inside and below the base rail composed of two, and the sliding portion is configured so that the sliding contact portion is the base rail. The buried pipe propulsion device according to claim 3, wherein the slide body is a slide portion in which a lower end edge of the slide body is in contact with the bottom rail when slidingly contacting the reference surface. In the buried pipe propulsion device in which the propulsion unit that advances and retreats on the base supports the end of the buried pipe and supports the leading conduit or the auger screw in a rotatable manner, Two base rails separately provided on the base, a slide portion mounted so as to be able to advance and retreat along the base rail, and a second intermediate rail interposed between the slide portion and the base. An actuator, a propulsion rail provided on the slide unit to regulate the advancing and retreating direction of the propulsion unit when the propulsion unit is advanced and retracted from the slide unit, and the base at the bottom of the base At least one bottom rail provided inside the rail, and a second actuator interposed between the slide portion and the propulsion portion, the slide portion having a lower portion The buried pipe propulsion device, which is disposed so as to be in sliding contact with the bottom rail, is a slide portion which holds the main body portion of the first actuator and is connected to the operation portion of the second actuator. . The second actuator is arranged symmetrically with respect to the front surface of the propulsion unit so that the two actuators should support the buried pipe, the tip conduit or the auger screw, and the main body penetrates the propulsion unit. The buried pipe propulsion apparatus according to claim 5, wherein the buried pipe propulsion apparatus is a second actuator provided to do so. The base rail is a base rail arranged with reference surfaces facing upward on both sides of the region where the propulsion unit should advance and retreat, and the slide portion is individually slidably contacted with the reference surface of the base rail. And a slide body that is arranged in the middle of both the sliding contact portions and is continuous between the sliding contact portions and has a lower end that is slidably contacted on the bottom rail. The buried pipe propulsion device according to claim 5 or 6, wherein the first actuator is a first actuator that is laterally provided on a sliding contact portion of the slide portion above a reference plane of the base rail. The slide main body is a slide main body that is continuously provided near the rear end of the sliding contact portion, and further protrudes rearward. The propulsion rail is located at a position where the sliding contact portions face each other. The buried pipe propulsion device according to claim 7, wherein the two propulsion rails are formed. The first actuator is a first actuator arranged such that its axis is at the same height as a position where the buried pipe or the leading conduit or the auger screw should be supported, and the propulsion rail has a center line The buried pipe propulsion device according to any one of claims 5 to 8, which is a propulsion rail formed to have the same height as the axis of the first actuator.

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