JP2010168788A - Synthetic resin driving pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To align the positions of the claw member of a driving power transmission rod and the end of a driving pipe with each other by eliminating the displacement of the design length of a pipeline from the cumulative length of the driving pipes in use even when the curved pipeline is formed since the pipeline can be bent with respect to the pipe axis. <P>SOLUTION: This synthetic resin driving pipe 10 is used in a low load resistant driving construction method, and forms an underground pipeline such as a sewage pipeline. Two projecting parts 46 which project in the pipe axis direction are formed on one end surface 44 of the driving pipe. The projecting parts 46 are formed vertically symmetric with respect to the pipe axis of the driving pipe 10. The length of each projecting parts 46 between the top end 48 and the rear end 52 in the pipe axis direction is set to a predetermined length L which is equal to the length a rod member (22) constituting a driving power transmission rod (20). When the curved pipeline is formed by connecting such driving pipes 10, during the driving, the connection part of the driving pipes 10 is bent about the top end 48 of the projecting part 46. Namely, the pipeline is bent with respect to the pipe axis. Therefore, the pipe ends of the driving pipes 10 are positioned at predetermined intervals L. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a synthetic resin propulsion pipe, and more particularly, for example, a synthetic resin propulsion pipe that is used in a propulsion method in which a propulsion pipe is pushed by a claw member provided on a propulsion force transmission rod for each required number to form an underground conduit. Regarding the propulsion pipe.

  An example of a conventional propulsion method is disclosed in Patent Document 1. The propulsion method disclosed in Patent Document 1 is a low load resistance type propulsion method using a synthetic resin propulsion pipe. In this propulsion method, a claw-like support member is provided on the propulsion force transmission rod that transmits the propulsive force from the main jack, and the tube end of the propulsion pipe is pushed by the support member for each required number. As a result, the frictional resistance force between the outer peripheral surface of the propulsion pipe and the surrounding soil is distributed over the required number of propulsion pipes. Therefore, according to the technique of Patent Document 1, a long distance in the low load resistance propulsion method Promotion becomes possible.

JP 2008-266922 A [E21D 9/06]

  The propulsive force transmission rod is usually formed by connecting a plurality of rod members having the same length as the propulsion pipe. Further, as described above, the claw members (propulsion tube support members) of the propulsive force transmission rod of Patent Document 1 are provided for each required number of the propulsion tubes, so the interval between the claw members is the required length of the tube length of the propulsion tube. Set to several times. For example, when a propelling pipe having a pipe length of 1.33 m (predetermined length L) is used and a propelling pipe is formed every ten, a claw member is provided for every ten rod members. The interval between the claw members is set to 13.3 m.

  Here, in the case where a straight pipe line is formed by using the propulsion pipe 1 having a flat end face as disclosed in Patent Document 1, the pipe is formed as shown in FIG. The pipe length of the road is an integral multiple of the predetermined length L of the propulsion pipe 1, and the pipe end of the propulsion pipe 1 is positioned for each predetermined length L. Therefore, as described above, the position of the claw member and the position of the pipe end of the propelling pipe 1 match if the interval between the claw members is set to the required number of times the length of the propelling pipe 1.

  However, as shown in FIG. 8B, when a curved pipeline is formed or when there is a curved portion of the propulsion route, the pipeline bends based on the innermost reference of the pipeline, that is, the innermost curve. The tube ends of the propulsion tube 1 are in contact with each other on the inner side, and the tube ends of the propulsion tube 1 are separated on the outer side of the curve so that a gap is formed. For example, when the 1.33 m propulsion pipe 1 is connected to form a pipe line having a curved radius R = 60 m, the angle between the pipe end faces of the adjacent propulsion pipes 1 is 1.4 degrees, and the adjacent propulsion pipes 1, a gap α of 4 mm is generated in the tube axis direction 2. That is, the pipe length of the formed pipe line is longer than an integral multiple of the predetermined length L of the propulsion pipe 1, and it is shifted between the design length of the pipe line and the integrated length of the synthetic resin propulsion pipe used. Will occur.

  Therefore, when it is going to form a curved pipe line using the technique of patent document 1, there exists a possibility that position shift may arise in the nail | claw member of a propulsive force transmission rod, and the pipe end of a propulsion pipe, and propulsion is carried out by a nail | claw member. There is a risk that the tube cannot be pushed properly.

  In order to eliminate such misalignment between the claw member and the tube end of the propulsion pipe, a method of changing the distance between the claw members according to the construction site is conceivable. However, in order to change the interval between the claw members, special rod members having different tube lengths are required. The propulsion path differs depending on the construction site, that is, there is a linear propulsion path and a curved propulsion path with various curvatures. Therefore, in order to change the interval between the claw members according to the construction site, many kinds of special rod members must be prepared, and the cost increases, so this method is not practical.

  Further, when a curved pipe line is formed by a conventional propulsion pipe, the pipe line must be forcibly bent by utilizing the slight flexibility of the connection part of the propulsion pipe and the propulsion pipe itself. In this case, the sharper the curve, the more excessive load is applied to the end of the propulsion pipe, and the propulsion pipe may be damaged. For example, the abutment between the tube ends of the propulsion tube is a one-point load on the innermost side of the curve (see FIG. 8B), so that the tube end is easily cracked or deformed.

  Therefore, the main object of the present invention is to provide a novel synthetic resin propelling tube.

  Another object of the present invention is to provide a synthetic resin propulsion pipe that can eliminate the deviation between the design length of the pipe line and the integrated length of the synthetic resin propulsion pipe used even when a curved pipe line is formed. Is to provide.

  Still another object of the present invention is to provide a synthetic resin propulsion pipe that can easily form a curved pipe line.

  The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses and supplementary explanations indicate correspondence with embodiments described later in order to help understanding of the present invention, and do not limit the present invention.

  1st invention is a synthetic resin propulsion pipe used for the propulsion construction method which forms a underground pipe line by pushing a propulsion pipe for every required number with a claw member provided in a propulsion force transmission rod, It is a synthetic resin propulsion pipe provided with projections formed at symmetrical positions with the tube axis as a center point.

  In the first aspect of the invention, the synthetic resin propelling pipe (10) has a low load bearing type propulsion method, in particular, a synthetic resin propelling pipe for each required number of claws (26) provided on the propulsive force transmission rod (20). It is used for propulsion methods that are pushed while pushing. The synthetic resin propelling tube is formed in a straight tube shape, and two projecting portions (46) projecting in the tube axis direction are formed on one end surface (44) thereof. The protrusions are formed at symmetrical positions with the tube axis of the synthetic resin propelling tube as the center point.

  When such a synthetic resin propulsion pipe is connected to form a curved pipe line, at the time of propulsion, the connecting part of the synthetic resin propulsion pipe bends with the apex of the projection as a fulcrum, that is, the pipe line is based on the pipe axis. Bends (see FIG. 6).

  According to the first invention, since the pipe can be bent with reference to the pipe axis, even if a curved pipe is formed, the design length of the pipe and the integration of the synthetic resin propulsion pipe to be used The deviation from the length can be eliminated.

  Further, since the protrusion is provided at the symmetrical position of the one end surface, a gap is generated between the adjacent synthetic resin propelling tubes, so that the connecting portion of the synthetic resin propelling tube can be easily bent. Therefore, it is easy to form a curved pipeline.

  Further, since the abutment between the tube ends of the synthetic resin propulsion tube at the time of propulsion can be a two-point load between the two protrusions and the other end surface, the synthetic resin is compared with a single point load. It is possible to reduce the possibility that the pipe end of the manufactured propulsion pipe is cracked or deformed.

  The second invention is dependent on the first invention, and the length in the tube axis direction from the other end surface to the apex of the protrusion is set to a predetermined length corresponding to the interval between the claw members provided on the propulsive force transmission rod. Is done.

  In the second invention, the length in the tube axis direction from the apex (48) to the other end surface (52) of the protrusion, that is, the tube length of the propulsion tube (10) is a claw member provided on the propulsion force transmission rod (20). It is set to a predetermined length corresponding to the interval (26). For example, it is set to the same predetermined length (L) as the rod member (22) constituting the propulsive force transmission rod.

  According to the second invention, even when a curved pipe line is formed, the position of the claw member of the propulsive force transmission rod and the position of the pipe end of the synthetic resin propulsion pipe can be appropriately matched, Regardless of the curved portion, a constant and uniform force is always applied from the claw member to the synthetic resin propelling tube.

  3rd invention is dependent on 1st or 2nd invention, and is formed by the inclined surface from the base end of a projection part to a vertex.

  In the third aspect of the invention, the base end to the apex (48) of the protrusion (46) formed on the synthetic resin propulsion pipe (10) is formed by the inclined surface (50) inclined at a predetermined angle (θ). The The predetermined angle of the inclined surface is set corresponding to, for example, the radius of curvature (R) of the pipe line formed by connecting the synthetic resin propulsion pipes, and is preferably required at each connecting portion of the synthetic resin propulsion pipes. It is set to be the same as or substantially the same as the bending angle. Thereby, the point contact of the pipe ends of the synthetic resin propelling pipe during curve propulsion can be avoided, and stress concentration during propulsion can be prevented.

  A fourth invention is a synthetic resin propulsion pipe according to any one of the first to third inventions, in which a main pipe part and a short cylindrical end member including a protrusion part are joined.

  In the fourth invention, the synthetic resin propulsion pipe (10) includes a main pipe part (54) and a short cylindrical end member (56) including a protrusion part (46), which are prepared as separate members. Then, it is formed by bonding.

  According to the fourth aspect of the present invention, the synthetic resin propulsion tube having a different projection shape can be manufactured simply by replacing the end member, and the production cost of the mold can be reduced, thereby reducing the manufacturing cost of the synthetic resin propulsion tube. it can.

  5th invention is dependent on either of the 1st thru | or 4th invention, and is further provided with the insertion part which is formed along the inner periphery and protrudes in a pipe-axis direction.

  In the fifth invention, the synthetic resin propelling pipe (10) includes the insertion portion (70). The insertion portion is formed in, for example, a thin cylindrical shape or a semi-cylindrical shape, and is formed so as to protrude from the inner peripheral edge of the one end face (44) in the tube axis direction. When connecting a synthetic resin propelling pipe, the insertion part is inserted into an adjacent synthetic resin propelling pipe and covers a gap (concave part) formed in the connecting part of the synthetic resin propelling pipe.

  According to the fifth aspect of the invention, since the gap formed in the connecting portion of the synthetic resin propelling pipe is covered by the insertion portion, the inner surface of the formed pipeline can be made substantially flat.

  According to the present invention, since the protrusion is formed at the symmetrical position of the end face, the pipe can be bent with reference to the pipe axis, and the combined length to be used with the design length of the pipe even when a curved pipe is formed. The deviation from the integrated length of the resin propelling pipe can be eliminated.

  Further, by forming the protrusions at symmetrical positions on the end face, a lateral gap is generated between the adjacent synthetic resin propelling tubes, so that the connecting portion of the synthetic resin propelling tubes can be easily bent. Therefore, it is easy to form a curved pipe line.

  Further, since the abutment between the tube ends of the synthetic resin propulsion tube at the time of propulsion can be a two-point load between the two protrusions and the other end surface, the synthetic resin is compared with a single point load. It is possible to reduce the possibility that the pipe end of the manufactured propulsion pipe is cracked or deformed.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

The external appearance of one Example of the synthetic resin propulsion pipe of this invention is shown, (A) is a front view, (B) is a top view. It is an illustration figure which shows the structure of the propulsion apparatus used when forming an underground conduit using the synthetic resin propulsion pipe of FIG. It is an illustration figure for demonstrating the propulsion construction method which forms an underground conduit using the synthetic resin propulsion pipe of FIG. It is an illustration figure for demonstrating an example of the manufacturing method of the synthetic resin propulsion pipes of FIG. It is an illustration figure which shows the state which connected the synthetic resin propulsion pipes of FIG. It is an illustration for demonstrating the state at the time of forming a pipe line using the synthetic resin propulsion pipe of FIG. 1, (A) shows the case where a linear pipe line is formed, (B) and ( C) shows a case where a curved pipe line is formed. One Example of the other synthetic resin propulsion pipe of this invention is shown, (A) is a front view, (B) is sectional drawing. It is an illustration for demonstrating the state at the time of forming a pipe line using the conventional propulsion pipe, (A) shows the case where a linear pipe line is formed, (B) is a curved pipe line. The case of forming is shown.

  With reference to FIGS. 1 and 3, a synthetic resin propulsion pipe 10 (hereinafter simply referred to as “propulsion pipe 10”) according to an embodiment of the present invention is used in a low load-bearing type propulsion method. Form underground pipes such as sewer pipes.

  Below, first, the low load-bearing type propulsion method and the propulsion device 12 used in the present invention will be described to the extent necessary for understanding the present invention.

  The low load-carrying type propulsion method is to apply the initial resistance force of the propulsion force from the main jack required for propulsion of the leading conductor to the propulsion force transmission rod, and the propulsion pipe has the resistance to the surrounding surface against the surrounding soil. This is a propulsion method applied to synthetic resin propulsion pipes such as vinyl chloride, which has a lower allowable load capacity than reinforced concrete pipes. As a low load-carrying type propulsion method, a press-fitting method, an auger method, a muddy water method, a mud pressure method, and the like are known, but the propulsion pipe 10 of this embodiment can be applied to any of these methods. .

  Further, in the propulsion method to which the propulsion pipe 10 is applied, the leading conductor is pushed by the propulsive force transmission rod, and the pipes of the propulsion pipe 10 are provided for each required number by a claw member (propulsion pipe support member) provided on the propulsion force transmission rod. The end is pushed. Thereby, the frictional resistance force between the outer peripheral surface of the propulsion tube 10 and the ground comes to act on the propulsion force transmission rod, that is, the peripheral surface resistance force applied to the propulsion tube 10 is dispersed and reduced by the required number, Even a propelling tube 10 made of synthetic resin can be propelled for a long distance. In addition, the said required number is set to the number in which the surrounding surface resistance force of the propulsion pipe 10 and the ground is less than the permissible patience of the propulsion pipe 10, and is set to, for example, 8 to 15.

  Specifically, as shown in FIG. 2, the propulsion device 12 used in this propulsion method includes a main pushing jack 14 that is a source of propulsive force, a leading conductor 18 to which a cutter 16 is attached at the tip, and a pushing jack. 14 includes a propulsive force transmission rod 20 that transmits the propulsive force from 14 to the leading conductor 18, and a soil pipe (not shown) for sending the excavated earth and sand.

  Here, the propulsive force transmission rod 20 is formed by connecting a plurality of rod members 22. The rod member 22 has a predetermined length L (for example, L = 1.33 m) that is the same as the length of the propulsion pipe 10, and is formed of a high load-bearing material such as a steel material. The connection part 24 is provided in each of the upper part of the both ends of the rod member 22, and the connection part 24 of the adjacent rod member 22 is pin-joined so that bending | flexion is possible in a horizontal direction.

  As described above, the propulsion force transmission rod 20 is provided with the claw member 26. The claw member 26 is formed so as to protrude upward and / or downward from the outer peripheral surface of the propulsive force transmission rod 20 and has a function capable of changing the state between a protruding state protruding outward and a retracted state retracting inward. . Such a claw member 26 is provided in the rod member 22 for every required number, that is, the interval between the claw members 26 is a required number times the predetermined length L (the length of the propelling tube 10 and the rod member 22). Set to

  Next, with reference to FIG. 3, the formation method of the underground conduit by the propulsion method using the propulsion device 12 will be described.

  When forming the underground conduit, first, the start up hole 30 and the reaching up hole 32 are excavated, and the main push jack 14 is installed in the excavated start up hole 30. Next, the leading conductor 18 is set on the pushing jack 14, and the leading conductor 18 is pushed and pushed by the pushing jack 14 while the cutter 16 of the leading conductor 18 is rotationally driven to excavate the ground.

  Subsequently, the rod member 22 is connected to the leading conductor 18 by pin joining, and the propulsion tube 10 is connected to the leading conductor 18 so as to be externally fitted thereto, and the rear end of the rod member 22 and the propelling tube 10 by the push jack 14. Push for further promotion. Thereafter, the connection work between the rod members 22 and the propulsion pipes 10 and the push-in work by the main push jack 14 are sequentially repeated to form an underground pipe line passing through a predetermined propulsion path. At this time, the rod members 22 provided with the claw members 26 are connected every required number, and the rod end of the propelling tube 10 is pushed by the rod members 22 every required number.

  When the leading conductor 18 reaches the reaching vertical hole 32, the leading conductor 18 is separated and collected, and the pushing operation is continued until the leading end of the propulsion pipe 10 (pipe) reaches the reaching vertical hole 32. When the leading end of the propulsion pipe 10 reaches the reaching vertical hole 32, the protrusion of the claw member 26 is pulled in, and then the propulsive force transmission rod 20 is recovered while sequentially separating the rod members 22, and the underground pipe line is formed. finish.

  In this way, by pushing the tube end of the propulsion tube 10 by the claw member 26 for each required number, even a synthetic resin propulsion tube 10 can be propelled for a long distance. Specifically, although it depends on conditions such as the soil quality of the ground and the diameter of the propulsion pipe 10, the propulsion possible distance is usually 30 to 70 m in the low load resistance propulsion method using no claw member 26. On the other hand, in the low load resistance propulsion method using the claw member 26, the propulsion possible distance reaches 200 to 300 m, enabling the long distance propulsion of the propulsion pipe 10 made of synthetic resin which is inexpensive and excellent in corrosion resistance. Yes.

  In such a propulsion method using the propulsion device 12, it is important to match the position of the claw member 26 and the position of the pipe end of the propulsion pipe 10 in order to appropriately push the propulsion pipe 10 by the claw member 26. In the present invention specifically described below, the position of the claw member 26 and the pipe end of the propulsion pipe 10 can be obtained without using a special propulsion force transmission rod 20 even when a curved pipe line is formed. A propulsion tube 10 that can be adjusted in position is provided.

  With reference to FIG. 1, the propulsion pipe 10 which is one Example of this invention is demonstrated concretely. FIG. 1A is a front view showing the appearance of the propulsion pipe 10 as viewed from the lateral direction, and FIG. 1B is a plan view showing the appearance of the propulsion pipe 10 as seen from above.

  The propulsion tube 10 is formed in a straight tube shape by a synthetic resin such as hard vinyl chloride, and has a nominal diameter of, for example, 300 mm. At both ends of the propelling tube 10, a collar mounting portion 40 is formed that is thinner than the central portion thereof, and rubber ring grooves 42 are formed on the outer peripheral surface of the collar mounting portion 40.

  Further, two projecting portions 46 projecting in the tube axis direction are formed on the one end surface 44 of the propulsion tube 10. The two protrusions 46 are formed at vertically symmetrical positions with the tube axis of the propulsion tube 10 as the center point. The protrusion 46 has a flat apex 48, and the base end to the apex 48 of the protrusion 46 is formed by an inclined surface 50 that is inclined at a predetermined angle θ.

  The predetermined angle θ of the inclined surface 50 may be set corresponding to the radius of curvature R of the pipe line formed by connecting the propulsion pipe 10, and is the same as or substantially the same as the bending angle required for each connection portion of the propulsion pipe 10. It is preferable to set the same. For example, when forming a pipe line with a curved radius R = 60 m using the 1.33 m propulsion pipe 10, the angle θ of the inclined surface 50 may be set to 1.4 degrees. Further, as described above, the tube length of the propelling tube 10 is set to the same predetermined length L as that of the rod member 22 (for example, L = 1.33 m). The length in the tube axis direction from the apex 48 of 46 to the other end surface 52 is said.

  Such a propulsion tube 10 may be manufactured by creating a dedicated molding die and injection molding or the like, or after manufacturing a conventional propulsion tube, the one end face 44 is scraped off to form the protrusion 46 in post-processing. You may make by doing. Further, the propulsion tube 10 does not need to be integrally formed in advance, and may be manufactured by joining two members. Referring to FIG. 4, for example, a main tube portion 54 (a portion on the left side from the broken line b) including the other end surface 52 to the rubber ring groove 42 on the one end surface 44 side, and a short cylindrical end member including the protrusion 46. 56 (a portion on the right side of the broken line b) is manufactured separately, and the end face of the main pipe portion 54 and the end face of the end member 56 are joined by bonding or fusion, so that the propulsion pipe 10 can be manufactured. Good. However, since the propulsion pipe 10 is connected by the collar 62 as will be described later, the main pipe portion 54 and the end member 56 do not necessarily have to be integrated by adhesive bonding or the like. Only the member 56 may be fixed. If the main pipe portion 54 and the end member 56 are separately manufactured in this manner, the propulsion pipe 10 having a different shape of the protrusion 46 can be manufactured simply by replacing the end member 56. For example, when a plurality of types of propulsion pipes 10 are manufactured using a dedicated mold, it is only necessary to prepare a plurality of molds for the end member 56, and the main pipe portion 54 can be manufactured using a common mold. Compared to preparing a plurality of large molding dies for forming the entire propelling tube 10 at a time, the manufacturing cost of the molding dies can be reduced, and the manufacturing cost of the propelling tube 10 can be reduced.

  As shown in FIG. 5, when connecting the propulsion pipes 10 (when forming a conduit), a rubber ring 60 is attached to the rubber ring groove 42, and one end face 44 and the other end face 52 of the propulsion pipe 10 are The collar 62 is externally fitted to the rubber ring mounting portion 40 so that the two are in contact with each other. As a result, the rubber ring 60 is pressed against the outer surface of the propulsion pipe 10 and the inner surface of the collar 62 to exhibit a sealing function, and water leakage from the formed pipe line and water intrusion into the pipe line are prevented. The As the rubber ring 60, a water swelling type rubber ring or the like can be used, and as the collar 62, a SUS color, a rib color, or the like can be used. Note that the protrusion 46 may be disposed on either the front side or the rear side in the propulsion direction.

  As shown in FIG. 6A, when such a propulsion pipe 10 is connected to form a straight pipe line, the apex 48 of the protrusion 46 and the other end surface 52 abut at the time of propulsion. And the pipe length of the formed pipe line is an integral multiple of the predetermined length L of the propulsion pipe 10, and the pipe end of the propulsion pipe 10 is positioned for each predetermined length L. Therefore, if the distance between the claw members 26 is set to be the required number of pipe lengths of the propulsion pipe 10, the position of the claw member 26 and the position of the pipe end of the propulsion pipe 10 can be matched. Also, in this case, by making the apex 48 of the protrusion 46 flat, so-called point contact with the other end surface 52 can be avoided, and stress concentration during propulsion can be prevented.

  On the other hand, as shown in FIGS. 6B and 6C, when the propulsion pipe 10 is connected to form a curved pipe line, at the time of propulsion, the connecting portion of the propulsion pipe 10 is bent with the apex 48 as a fulcrum. The inclined surface 50 of the protrusion 46 and the other end surface 52 come into contact with each other. In other words, since the pipe line can be bent with reference to the pipe axis, there is no gap in the pipe axis direction 2. Thereby, the pipe length of the formed pipe line becomes an integral multiple of the predetermined length L of the propulsion pipe 10, and the pipe end of the propulsion pipe 10 is positioned for each predetermined length L. Therefore, if the distance between the claw members 26 is set to be the required number of pipe lengths of the propulsion pipe 10, the position of the claw member 26 and the position of the pipe end of the propulsion pipe 10 can be matched. Further, in this case, the abutment between the tube ends of the propulsion tube 10 is at least between the two protrusions 46 and the other end surface 52 at the farthest positions on one end surface (that is, symmetrical positions with the tube axis as the center point). Since it becomes a two-point load, the risk that the pipe end of the propulsion pipe 10 is cracked or deformed can be reduced as compared with a one-point load. Furthermore, as shown in FIG. 6 (C), by setting the predetermined angle θ of the inclined surface 50 of the protrusion 46 to the same or substantially the same as the bending angle required for each connecting portion of the propulsion pipe 10, Point contact with the other end surface 52 can be avoided, and stress concentration during propulsion can be prevented.

  According to this embodiment, since the projections 46 are formed in the vertically symmetrical position of the one end face 44, the pipe can be bent with respect to the pipe axis, and the design of the pipe is possible even when a curved pipe is formed. Deviation between the length and the integrated length of the propelling pipe 10 to be used can be eliminated. Further, since it is possible to prevent the displacement between the claw member 26 of the propulsion force transmission rod 20 and the tube end of the propulsion tube 10, a constant and uniform force is always propelled from the claw member 26 regardless of the straight portion or the curved portion. It can be applied to the tube 10. In addition, this makes it possible to deal with various propulsion paths having different linear shapes, curved shapes, and even curvatures without using a special propulsive force transmission rod 20, thereby reducing the equipment cost.

  Moreover, in the conventional propulsion pipe 1 as shown in FIG. 8, when it is going to bend the connection part of the propulsion pipe 1, since a pipe end collides with the innermost side of a curve and becomes a resistance force at the time of bending a connection part, The bendability of the connecting portion is limited. However, according to the propulsion pipe 10 of this embodiment, since the protrusions 46 are formed in the vertically symmetrical positions of the one end face 44, a lateral gap is generated between the adjacent propulsion pipes 10, so The connecting portion can be easily bent in the lateral direction. Therefore, it is easy to form a curved pipeline. Further, the propulsion pipe 10 can easily bend the connecting portion, and can prevent the tube ends from contacting each other at the time of propulsion, so that damage during propulsion is unlikely to occur.

  Furthermore, in the conventional propulsion pipe 1 as shown in FIG. Once such a gap α is formed, when the propulsion path is changed from a curved line to a straight line, the wrinkle of a certain connecting portion (gathering the gap α) may result in a large gap. is there. If the gap between the connecting portions becomes too large, a large dent will be formed on the inner surface of the tube, so that problems such as catching of falling material and removal of the collar 62 will occur. However, according to the propulsion pipe 10 of this embodiment, the apex 48 of the protrusion 46 and the other end surface 52 are always in contact with each other, and the gap α is not formed, so the above-described problems do not occur.

  In the above-described embodiment, the protrusion 46 is formed only on the one end face 44, but the protrusion 46 may be formed on both end faces of the propulsion pipe 10. In this case, the length from the apex 48 of the protrusion 46 on the one end face 44 to the apex 48 of the protrusion 46 on the other end face 52 is set to a predetermined length L, and the inclination angle of the inclined surface 50 of the protrusion 46 is It can be small.

  In the above-described embodiment, the apex 48 of the protrusion 46 is formed in a planar shape, but it is not always necessary to have a planar shape. For example, the apex 48 of the protrusion 46 may be formed in a gently curved surface.

  Next, with reference to FIG. 7, a propulsion pipe 10 which is another embodiment of the present invention will be described. FIG. 7A is a front view showing the appearance of the propulsion pipe 10 viewed from the lateral direction, and FIG. 7B is a cross-sectional view showing a cross section of the propulsion pipe 10 cut in the vertical direction along the tube axis. It is. The propulsion tube 10 shown in FIG. 7 is substantially the same as the propulsion tube 10 shown in FIG. 1 except that an insertion portion 70 is provided at the end. In the following, the propulsion pipe 10 shown in FIG. 7 will be described in detail, but the same reference numerals are used for the same parts as the propulsion pipe 10 shown in FIG. 1, and the description thereof is omitted or simplified.

  As shown in FIG. 7, the propulsion tube 10 includes an insertion portion 70 formed on the one end face 44 side. When the propulsion pipe 10 is connected, the insertion portion 70 is inserted into the other end face 52 side of the adjacent propulsion pipe 10 to cover (close) a gap (concave portion) formed in the connection portion of the propulsion pipe 10. Is.

  Specifically, the insertion portion 70 is formed in a short cylindrical shape along the inner peripheral edge of the propulsion tube 10 so as to protrude from the one end surface 44 in the tube axis direction. The length by which the insertion part 70 protrudes from the one end surface 44 is set according to the angle θ of the inclined surface 50 of the protrusion part 46 and the like, and when the connecting part of the propulsion pipe 10 is bent, the insertion part 70 has a length. The length is set so that the tip does not come out of the adjacent propulsion tube 10. Moreover, since the insertion part 70 is exposed to the inner surface of the formed pipe line, it is desirable to be formed as thin as possible (for example, a thickness of 1 mm or less) so as not to cause a step on the inner surface of the pipe line.

  Such an insertion part 70 may be integrally formed with the other part of the propelling tube 10 by injection molding or the like in advance, or may be formed as a separate member and bonded to the other part by adhesive bonding or the like. You may do it. In addition, as described above, when the propulsion pipe 10 is manufactured by joining two members (for example, the main pipe portion 54 and the end member 56), the insertion portion 70 may be formed in the end member 56. The end member 56 and the insertion portion 70 may be integrally formed in advance by injection molding or the like. Thereby, the manufacturing cost of the propulsion pipe 10 can be reduced.

  As the material of the insertion part 70, it is better to use the same type of synthetic resin as the other parts of the propulsion tube 10, but when the insertion part 70 is formed as a separate member, polypropylene or polyethylene is used rather than hard vinyl chloride. It is preferable to use it because it is hard to break. This is because it is desirable to form the insertion portion 70 as thin as possible, and there is a risk of cracking in hard vinyl chloride.

  By forming such an insertion part 70, the gap between the connecting parts of the propulsion pipe 10, for example, the gap formed in the lateral direction by forming the protrusion 46, or the propulsive force by the main push jack 14 Since the gap formed by separating the pipe ends from each other when the no longer acts is covered, a pipe line having a substantially flat inner surface can be formed.

  In addition, although the insertion part 70 was formed in the cylindrical shape over the inner periphery of the drain pipe 10, it is not limited to this, It is also possible to form in the circular arc shape centering on the inner periphery bottom, for example, a semi-cylindrical shape. it can. This is because if the pipe formed by the propulsion pipe 10 is a sewer pipe, the drainage often flows near the bottom of the pipe rather than flowing in the pipe with full water, so it is only necessary to cover the portion where the drainage flows. .

  Moreover, the insertion part 70 does not need to be formed in the one end surface 44 side in which the projection part 46 is formed, and may be formed in the other end surface 52 side formed in planar shape.

  Further, the insertion portion 70 may be formed so as to increase in diameter as the distance from the one end face 44 is increased so as not to interfere with insertion into the adjacent propulsion pipe 10. Thereby, the insertion part 70 comes to closely_contact | adhere to the internal peripheral surface of the adjacent propulsion pipe 10, and the flow of the waste_water | drain in a pipe line can be made smoother.

  The propulsion pipe 10 of each of the above-described embodiments is preferably used in a propulsion method using the claw member 26, but of course can also be applied to a propulsion method that does not use the claw member 26. The effect that the connection part of the pipe | tube 10 can be bent easily is exhibited.

DESCRIPTION OF SYMBOLS 10 ... Synthetic resin propulsion pipe 12 ... Propulsion apparatus 14 ... Main pushing jack 18 ... Lead conductor 20 ... Propulsion force transmission rod 22 ... Rod member 26 ... Claw member 46 ... Protrusion part 48 ... Protrusion part 50 ... Inclination of protrusion part Surface 70 ... Plug part

Claims (5)

It is a synthetic resin propulsion pipe used in the propulsion method of forming the underground pipe line by pushing the propulsion pipe by the required number by the claw member provided on the propulsion force transmission rod,
A synthetic resin propulsion pipe provided with a protrusion formed at a symmetrical position with the tube axis of the one end face as the center point.   2. The synthetic resin propulsion according to claim 1, wherein a length in a tube axis direction from the other end surface to the apex of the protrusion is set to a predetermined length according to a distance between claw members provided on the propulsion force transmission rod. tube.   The synthetic resin propulsion pipe according to claim 1 or 2, wherein the protrusion is formed by an inclined surface from the base end to the apex.   The synthetic resin propulsion pipe according to any one of claims 1 to 3, wherein a main pipe part and a short cylindrical end member including a protruding part are joined.   The synthetic resin propulsion pipe according to any one of claims 1 to 4, further comprising an insertion portion formed along the inner peripheral edge and projecting in the pipe axis direction.

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