JP2009133188A - Curve jacking method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a curve jacking method for a low loading capacity system attaining long-distance curve jacking. <P>SOLUTION: A jacking transmission inner unit 5 for use in a curve jacking method for the low loading capacity system supports jacking pipes 1 used for low loading capacity by a jacking pipe support member 6 installed at the jacking transmission inner unit 5 at every number of the jacking pipes 1 when peripheral surface frictional resistance force between the jacking pipe 1 and the natural ground is less than the allowable loading capacity of the jacking pipe 1. The jacking transmission inner unit 5 is formed by connecting two inner unit pipes in a horizontally turnable manner by a connecting structure provided at the end face center of the pipes, and the end faces of the two inner unit pipes can abut each other by turning around the connecting structure as a turning shaft. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a new propulsion method that enables long-distance curve propulsion in a low load resistance method using a synthetic resin propulsion pipe represented by vinyl chloride.

  Pipe materials used for sewer excavation work were mainly reinforced concrete pipes (fume pipes) in the Showa era. However, in the Heisei era, corrosion of reinforced concrete structures caused by hydrogen sulfide and the like became a problem. For this reason, vinyl chloride pipes increased rapidly among non-corrosive synthetic resin pipes, and the share of reinforced concrete pipes is now 1 The result was down to about%.

  On the other hand, the sewerage is mostly laid under the road, and environmental problems such as traffic congestion, vibration, and noise occur on main roads, shopping streets, and residential areas with high traffic. Therefore, from the viewpoint of coping with these problems, it has been increasingly common to dig up a shaft and lay sewer pipes using the propulsion method. In the sewer standard, the load-bearing method is classified into the high load-bearing method and the low load-bearing method, depending on the type of pipe material used for the propulsion method.

  As shown in FIG. 1, the high load-bearing force method is a method of propelling using a high load-bearing force propelling pipe 1 typified by a reinforced concrete pipe or a resin pipe. The propulsive force is directly received and transmitted to the leading conductor 3 for construction.

  In addition, as shown in FIG. 2, the low load-bearing strength method is propelled by using a low load-bearing force propelling pipe 1 such as a vinyl chloride pipe, and is used to push the leading conductor 3. In this construction method, the initial resistance of the propulsive force from the device 2 is applied to the propulsive force transmission rod 4 and the propulsion pipe 1 bears only the resistance of the natural ground and the outer surface of the pipe.

  In other words, in the low load resistance method, the tip resistance force of the propulsion force of the leading conductor 3 is applied to the propulsion force transmission rod (casing, screw conveyor, etc.) 4, and the propulsion tube 1 only receives the peripheral surface resistance force with the natural ground. In this method, the tip resistance force is borne by the propulsive force transmission rod 4, and therefore the propulsion distance can be extended by the tip resistance.

  However, in such a conventional low load resistance method, as shown in FIG. 3, the propulsion pipe 1 is sequentially connected through the propulsion pipe collar 1a, and the circumferential surface resistance force between the propulsion pipe 1 and the ground is propelled. It was limited to a propulsion extension that did not exceed the allowable load capacity of the tube 1.

  That is, since the propulsion pipe 1 is pushed in by the main pushing device of the start shaft, a large force is applied to the propulsion pipe near the start shaft against the circumferential resistance force of the entire propulsion extension. For this reason, long-distance construction is not possible with low load-bearing propulsion pipes, and high load-bearing methods have been adopted for propulsion works that require long distances.

  However, in the high load-bearing method, the resin propulsion pipe is resistant to corrosion, but it is very expensive compared to the reinforced concrete propulsion pipe. Was the current situation.

  Therefore, by the present inventors, there is no concern about the corrosion problem in the case of reinforced concrete propulsion pipes, without using expensive resin propulsion pipes, and synthetic resin propulsion pipes such as vinyl chloride propulsion pipes in the conventional low load resistance system There has been proposed a new long-distance propulsion method that enables long-distance propulsion using (Patent Document 1).

  In this long-distance propulsion method, as shown in FIG. 4, the propulsion pipe material used for the low load-bearing capacity is divided into the number of the peripheral friction resistance force between the propulsion pipe 1 and the ground is less than the allowable load bearing capacity of the propulsion pipe 1. In addition, by supporting by the propulsion pipe support member 6 installed in the propulsion transmission inner unit 5 that transmits the thrust from the main push jack, the friction resistance between the natural ground and the propulsion pipe material is equal to the required number of propulsion pipes 1. Thus, the frictional resistance between the natural ground and the propelling pipe material generated by the one-span propulsion extension from the conventional starting shaft to the reaching shaft can be made very small.

  Thus, the propulsion extension is achieved by supporting the propulsion pipe 1 and the ground, which vary depending on the pipe diameter, soil quality, construction conditions, and the like, with the propulsion pipe support member 6 for each number in which the friction resistance is lower than the allowable load capacity of the propulsion pipe 1. The long-distance propulsion is realized by the low load-bearing method without being restricted by the propelling pipe material.

  However, in actual construction sites, the road width is narrow and winding, and long-distance propulsion often results in a curve and often requires construction using a curved propulsion method.

  In such a case, there is a problem to be solved even in the long-distance propulsion method using the low load-bearing force method.

That is, a plurality of propulsion pipes 1 are connected in the entire cross section during straight construction, and the allowable load-carrying capacity of the propulsion pipe 1 does not decrease. The mutual contact area of the propulsion pipe 1 decreases, and the load bearing capacity of the propulsion pipe 1 decreases in proportion to the contact area / effective cross-sectional area with respect to the effective cross section. Accordingly, in the low load resistance type curve propulsion method, a larger load resistance is required than in the case of straight construction, and the construction is limited to a short distance in order to prevent the propulsion pipe 1 from being damaged.
Japanese Patent Application No. 2007-108693

  The present invention has been made in view of the above circumstances, and it is an object to enable long-distance curve propulsion by preventing breakage of the propulsion pipe connecting portion in the low load-bearing type curve propulsion method. Yes.

In order to solve the above problems, the invention of this application provides a propulsion transmission inner unit, a propulsion pipe, and a curve propulsion method having the following characteristics.
<1> The propulsion pipe used for low load-bearing capacity is a propulsion transmission inner that transmits thrust from the main jack every time the frictional resistance between the propulsion pipe and the ground is below the allowable load-bearing capacity of the propulsion pipe. A propulsion transmission inner unit used in a low load-bearing type curve propulsion method supported by a propulsion pipe support member installed in the unit, wherein the propulsion transmission inner unit has two inner unit pipes at the center of the end face of the pipe A curve in which the end surfaces of the two inner unit tubes can be brought into contact with each other by rotating about the connecting structure as a rotating shaft. Propulsion transmission inner unit. <2> The curved propulsion transmission inner unit according to <1>, wherein the connection structure is a pin structure or a spherical structure. <3> At least one end face of the end faces where the two inner unit pipes forming the propulsion transmission inner unit for a curve come into contact with each other has a shape that inclines as the distance from the rotation shaft by the connecting structure increases in the horizontal direction. <1> or <2> curve propulsion transmission inner unit. The <4> inner unit pipe is a propulsion transmission inner unit for curves according to the items <1> to <3>, wherein the inner unit pipe has a square shape with a space inside. <5> The propulsion pipe used for low load-bearing capacity is divided into propulsion transmission inners that transmit thrust from the main jack every time the frictional resistance between the propulsion pipe and the ground is below the allowable load-bearing capacity of the propulsion pipe. A propulsion pipe for curving used in a curvilinear propulsion method of a low load resistance system supported by a propulsion pipe support member installed in the unit, wherein the propulsion pipe is a set of two pipes, and the two pipes are mutually connected. In the state of contact at the center of the end surface, horizontal rotation about the end surface center is possible, and the end surfaces of the two tubes can be contacted by this rotation. Curved propulsion tube. <6> The propulsion pipe according to the above <5>, wherein the end face where the two pipes contact each other has an end face of at least one pipe inclined in a horizontal direction away from the end face central axis. <7> The curved propulsion pipe according to <5> or <6>, wherein the end faces where the two pipes abut each other are connected to each other by an uneven surface or a spherical surface at the center of each end face. <8> The curved propulsion pipe according to <5> or <6>, wherein the end face where the two pipes contact each other has at least one end face of the pipe having a top at the end face center. <9> The curve propulsion pipe according to <8>, wherein a top portion is processed into a curved surface. <10> The propulsion pipe used for low load bearing capacity is a propulsion transmission inner that transmits thrust from the main jack every number of friction pipes where the peripheral friction resistance between the propulsion pipe and ground is below the allowable load bearing capacity of the propulsion pipe. A curve propulsion method of a low load resistance system supported by a propulsion pipe support member installed in the unit, wherein the propulsion transmission inner unit according to any one of claims 1 to 4 and the propulsion pipe according to claims 5 to 9 are rotated. The end face has an inclined shape with the same angle, and a plurality of propulsion transmission inner units are arranged inside a plurality of the propulsion pipes connected, and the propulsion pipe and the propulsion transmission inner unit are rotated on the same rotation axis. Curve propulsion method characterized by propulsion. <11> The curve propulsion method according to the above <10>, in which a straight propulsion transmission inner unit and a straight propulsion pipe are used according to the radius of curvature of the construction line.

  According to the present invention, long-distance propulsion is possible in a low load-bearing type curve propulsion method. Further, the curved propulsion pipe and the curved propulsion transmission inner unit can be manufactured at low cost.

  In order to apply the above-mentioned long-distance propulsion method of the low load resistance method proposed by the present inventor to the curve propulsion method, the present inventor has conducted further earnest studies and has completed the present invention.

  The curve propulsion method of the present invention is similar to the above-mentioned long-distance propulsion method of the low load-bearing method, and the propulsion pipe used for the low load-bearing force has a permissible frictional resistance between the propulsion pipe and the ground. For each number below the load bearing capacity, propulsion is supported by a propulsion pipe support member installed in the propulsion transmission inner unit that transmits thrust from the main jack, but in order to enable curved propulsion, It has the following features.

  Hereinafter, embodiments of the present invention will be described in more detail.

  FIG. 5A is a perspective cross-sectional view illustrating a straight-line propulsion transmission inner unit, and FIG. 5B is a perspective cross-sectional view illustrating an embodiment of the curved propulsion transmission inner unit of the present invention. . A plurality of propulsion transmission inner units are connected and used in order to propel the propulsion pipe to a predetermined position.

In order to carry out the curve propulsion method of the present invention, the straight line propulsion transmission inner unit 5a and the curve propulsion transmission inner unit 5b illustrated in FIG. 5 should be used in appropriate combination according to the radius of curvature required during construction. Is preferred. For example, in the case of a sharp curve, only the curved propulsion transmission inner unit 5b is used, and in the case of a slow and sharp line, a plurality of linear propulsion transmission inner units 5a and a single curved propulsion transmission inner unit 5b are used in combination. It is also possible to perform construction according to various radii of curvature by combining straight and curved propulsion transmission inner units. The curvilinear propulsion transmission inner unit 5b of the present invention is a means for improving economy because the price is higher than that of the straight propulsion transmission inner unit 5a.

  FIG. 6 is a cross-sectional view illustrating a cross section of the propulsion transmission inner unit.

  The propulsion transmission inner unit 5 is different depending on the muddy water method, the mud pressure method, the mud concentration method, etc., but for example, the mud pipe 7 for holding the cutting blade, the mud pipe 8 and the power line 9 for excavation or It is possible to adopt a structure in which a hydraulic pipe, a screw, a rod and a lubricant pipe 10 for feeding a lubricant are fixed or passed through the inner unit pipe.

  FIG. 7 is a perspective cross-sectional view showing a turning state of the curved propulsion transmission inner unit illustrated in FIG. The curved propulsion transmission inner unit 5b is formed by connecting two inner unit tubes 11 so as to be rotatable in a horizontal direction by a connecting structure 12 provided at the center of an end surface of the tube. The end surfaces 11a of the two inner unit tubes 11 can be brought into contact with each other by the rotation A. The connection structure 12 is not particularly limited as long as the inner unit tube 11 can be rotated in the horizontal direction. However, the pin structure as illustrated in FIG. Therefore, it is preferable.

  The shape of the end surface 11a with which the two inner unit tubes abut each other is such that at least one end surface is inclined as the distance from the rotation axis A increases in the horizontal direction. In other words, the shape is inclined from the center of the end surface serving as the rotation axis A toward the tube end edge portion 11b in the rotation direction. Therefore, since the end surfaces 11a can come into contact with each other over a wide area during rotation, the load applied to the end surface of the propulsion transmission inner unit tube can be borne by the end surface 11a during curve propulsion, and the propulsion transmission inner unit tube is damaged. Can be prevented.

  In addition, the curved propulsion transmission inner unit of the present invention can be configured, for example, as illustrated in FIG.

  In the curved propulsion transmission inner unit of this form, the inner unit tube 11 is prismatic and has a cavity inside. In this case, as illustrated in FIG. 8, in the connection structure 12, it is preferable that the two inner unit pipes 11 are connected at two locations at the center of the end surface. The two inner unit tubes 11 are connected to each other so as to be rotatable in the horizontal direction by the rotation axis A of the connection structure 12, and the end surfaces 11a of the two inner unit tubes 11 can be brought into contact with each other by this rotation. It is said that. Also in this embodiment, it is preferable that the shape of the end surface 11a with which the two inner unit tubes abut each other is such that at least one of the end surfaces is inclined from the rotation axis A in the horizontal direction. Also with this type of propulsion pipe, the end faces 11a can come into contact with each other over a wide area. Therefore, the load applied to the end face of the propulsion transmission inner unit pipe during curve propulsion can be borne by the end face 11a. Can prevent damage.

  Further, in the curved propulsion transmission inner unit illustrated in FIG. 8, the connecting structure 12 has only a role as a rotating shaft, and the inner unit tubes 11 are connected to each other by a connecting member 13 that covers the connecting structure 12. You can also. By providing the connecting member 13, the inner unit pipes 11 are securely connected to each other. Therefore, when the propulsion transmission inner unit is pulled out and collected when the propulsion is completed or when the leading conductor or the like breaks down, the connecting member 13 is used. In addition, it is possible to bear the load caused by pulling out, and it is possible to reliably recover the propulsion transmission inner unit. The method of connecting the inner unit tubes 11 by the connecting member 13 is not particularly limited. For example, a convex portion is provided on the outer surface of the inner unit tube 11 and a concave portion is provided on the connecting member 13 so that the concave and convex portions are fitted. Etc. are considered.

  Further, in this form of the propulsion transmission inner unit for curves, the inner unit pipe has a prismatic shape and the inside has a cavity, so that a mud pipe, a mud pipe, a lubricant pipe, etc. are passed through the cavity. You can also.

  Further, for example, as shown in the cross-sectional view of the side view (b) of FIG. 9 (a), by providing a cable tray 14 below the inner unit pipe 11, the mud feed pipe 7, the mud discharge pipe 8, the lubricant It is also possible to hold the tube 10 or the like on the cable tray 14 and effectively use the cavity in the inner unit tube 11.

  For example, the cavity in the inner unit tube 11 can be used as a space for surveying using the laser 15, as shown in the sectional view of the side view (b) of FIG. In addition, accurate construction is possible. Further, as shown in the sectional view of the side view (b) of FIG. 11 (a), in order to run the surveying robot 17 by installing one or a plurality of rails 16 at the lower part in the inner unit pipe 11. It can also be used as a space. In addition, by installing a similar rail 16 in the upper part in the inner unit pipe 11, the surveying robot 17 can be run in a monorail manner as shown in the sectional view of the side view (b) of FIG. You can also. By using a surveying robot, more accurate construction is possible.

  When the propulsion transmission inner unit 5 completes the propulsion, the propulsion pipe support member is pulled inward and then collected. Therefore, in any of the above-described embodiments, the ball or wheel for enabling easy collection is provided. It can also be provided.

  FIG. 13A is a perspective view illustrating a straight propulsion pipe, and FIG. 13B is a perspective view illustrating an embodiment of a curved propulsion pipe of the present invention.

  As shown in FIG. 13 (a), the straight propulsion pipe 18 has a high load resistance because it is connected in the entire cross section.

  On the other hand, as shown in FIG. 13B, the curved propulsion pipe 19 of the present invention is a set of two pipes 20 and 21 as shown in FIG. 13 (b).

  The two pipes 20 and 21 are connected to each other at two positions in the center of the end face by a coupling structure 22 with an uneven surface, and as the end face 20a or the end face 21a of at least one pipe is separated from the end face central axis B in the horizontal direction. The shape is inclined. In other words, the shape is inclined from the end surface center axis B toward the horizontal pipe end edge 20b or 21b. In FIG. 13B, a convex portion 22a is provided on the tube 20 and a concave portion 22b is provided on the tube 21 to be coupled. With such a shape, it is possible to rotate in the horizontal direction with the end surface central axis (B) as a rotation axis, and the end surfaces 20a and 21a of the respective tubes come into contact with each other. By this rotation, the end faces 20a and 21a of the two pipes come into contact with each other over a wide area, and the load applied to the curved propulsion pipe 19 can be borne by the end faces 20a and 21a during propulsion. Etc. can be prevented. As a result, curve propulsion is possible even with a low load bearing tube. In addition, in FIG.13 (b), although the form couple | bonded by an uneven surface is illustrated, it can also be set as the coupling | bonding structure using a spherical surface.

  Furthermore, it is more preferable that the curved propulsion pipe has the form illustrated in FIG. In this embodiment, the end surface 20a of at least one of the two tubes 20 and 21 has two top portions 23 at the center of the end surface and is inclined in the horizontal direction from the top portion 23. Thus, when the end faces 20a and 21a of the two pipes are in contact with each other at the top 23, the two pipes 20 and 21 are brought into contact with each other by rotation in the horizontal direction with the center (top) as the axis (B). The end surfaces 20a and 21a can be brought into contact with each other. In FIG. 14, an inclined surface having a top 23 is also formed on the tube 21, but the tube 21 may not have this inclined surface depending on the construction linear curvature radius.

  Further, the propulsion pipe of this form does not need to form the complicated coupling portion 22 as shown in FIG. 13B, and only the end face of one propulsion pipe needs to be processed into the inclined surface. It is more suitable because it is highly productive and can be manufactured at low cost, and since it has a simple shape, it is difficult to cause problems such as breakage. Further, it is more preferable to perform curved surface processing on the top portion 23 of FIG. By making the top part a smooth curved surface, the propulsion pipe can be rotated smoothly, and damage to the top part can be prevented.

  Furthermore, the curve propulsion method of the present invention will be described with reference to FIG.

  FIG. 15 (a) is a top view illustrating the case where the conventional curve propulsion transmission inner unit 24 and the propulsion pipe 25 are used in the curve propulsion method, and FIG. 15 (b) is a curve propulsion according to the present invention. It is a top view which illustrates the case where the transmission inner unit 5b and the curve propulsion pipe 19 are used.

  As shown in FIG. 15 (a), in the conventional case, the curved propulsion transmission inner unit 24 and the propulsion pipe 25 rotate about the end edges 24a and 25a of the pipe as rotation axes. A difference 26 in the opening length between the propulsion transmission inner unit 24 and the curve propulsion pipe 25 occurs, and the positional relationship is shifted. Due to this positional shift, a large force may be generated in the propelling tube 25 and it may break.

  Therefore, the curve propulsion method of this application uses the curve propulsion transmission inner unit 5b and the curve propulsion pipe 19 of the present invention. As shown in FIG. 15 (b), the end surfaces of the inner unit pipe 11 and the propulsion pipe 19 are processed into an inclined shape so that the rotation angles are the same, and the curved propulsion transmission inner unit 5b and the curved propulsion are driven. It arrange | positions so that the rotational axis of the pipe | tube 19 may become the same. That is, it arrange | positions so that the rotational axis (A) shown in FIG.7, FIG.8 and the rotational axis (B) shown in FIG.13, FIG.14 may correspond.

  The curved propulsion transmission inner unit 5b and the curved propulsion pipe 19 according to the present invention rotate the connection structure 12 and the coupling structure 22 provided at the center as the same rotation shaft, thereby allowing the end surface of the inner unit pipe to be rotated. 11a, and the end surfaces 20a, 21a of the propulsion pipes are in contact with each other over a wide area, so that the inner unit and the propulsion pipe are prevented from being damaged and the propulsive force is improved as described above. Further, since the central portion is a rotation shaft, there is no difference in opening length 26 as shown in FIG. 15A, and the positional relationship between the inner unit pipe 11 and the curve propulsion pipe 19 is shifted. Therefore, there is no fear of contact between the two during rotation, and the propulsion tube 19 can be prevented from being broken.

  Further, as shown in FIG. 16, similarly, when the curved propulsion pipe 19 having the top 23 illustrated in FIG. 14 is used, the end surfaces of the inner unit pipe 11 and the curved propulsion pipe 19 have a rotation angle. By arranging the curved propulsion transmission inner unit 5b and the curvilinear propulsion pipe 19 to have the same rotational shape, the end surfaces abut on a wide area. Since the inner unit and the propulsion pipe are prevented from being damaged and the propulsive force is improved, and the central portion (the top portion 23) is used as the rotation shaft, the difference in opening length 26 as shown in FIG. In addition, the positional relationship between the inner unit pipe 11 and the curved propulsion pipe 19 does not shift, and the propulsion transmission inner unit pipe 11 and the curved propulsion pipe pipe 15 come into contact with each other during rotation. Fear It is possible to prevent damage, breakage of the propulsion tube. As shown in FIG. 17, when the top portion 23 of the propulsion tube is curved, the top portion 23 is prevented from being damaged and the propulsion tube can be rotated more smoothly. As described above, the embodiment shown in FIGS. 16 and 17 is easier to process the end face than the embodiment shown in FIG.

  Further, FIG. 18 is an overall explanatory view showing a usage pattern of the propulsion transmission inner unit and the propulsion pipe of the present invention.

  In the present invention, as illustrated in FIG. 18, a plurality of propulsion transmission inner units are arranged inside a plurality of propulsion pipes so as to rotate around the same rotation shaft. Moreover, in this invention, it is not limited to embodiment shown by FIG. 18, According to the curvature radius of construction linearity, it can also be used in various combinations for a linear propulsion transmission inner unit and a linear propulsion pipe.

  As described above, because the propulsion transmission inner unit for curves and the propulsion pipe for curves of the present invention prevent the propulsion pipe and the inner unit from being damaged, long-distance curve propulsion is possible in the low load resistance method. Become.

It is a general explanatory view about the propulsion method of a high load-bearing method. It is a general explanatory view about the low load-bearing type propulsion method. It is general explanatory drawing which shows the relationship with the surrounding surface resistance force in a low load-bearing-force system. It is a general explanatory view showing the relationship between the propulsion extension of the low load resistance method using the propulsion pipe support member and the peripheral surface resistance force. (A) is a perspective cross-sectional view illustrating a linear propulsion transmission inner unit, and (b) is a perspective cross-sectional view illustrating a curved propulsion transmission inner unit of the present invention. It is sectional drawing of the pipe | tube of a propulsion transmission inner unit. It is a perspective sectional view showing the rotation state of the propulsion transmission inner unit for curves of the present invention. It is a perspective view which illustrates a square-shaped propulsion transmission inner unit for curves. (A) is side explanatory drawing of the propulsion transmission inner unit which provided the cable tray, (b) is sectional drawing. (A) is explanatory drawing of the surveying method using the internal space of a square inner unit pipe | tube, (b) is sectional drawing. (A) is explanatory drawing of the surveying method using the internal space of a square inner unit pipe | tube, (b) is sectional drawing. (A) is explanatory drawing of the surveying method using the internal space of a square inner unit pipe | tube, (b) is sectional drawing. (A) is the perspective view which illustrated the propulsion pipe for straight lines. (B) is the perspective view which illustrated one Embodiment of the propulsion pipe for curves of this invention. It is the perspective view which illustrated one Embodiment of the propulsion pipe for curves which has a top part. (A) is a top view which illustrates the case where the conventional straight line propulsion transmission inner unit and the straight line propulsion pipe are used in the curved line propulsion method. (B) is a top view illustrating the case where the curved propulsion transmission inner unit and the curved propulsion pipe of the present invention are used. It is a top view which illustrates the case where the curve propulsion transmission of this invention and the curve propulsion pipe | tube which has a top part are used in a curve propulsion method. In a curve propulsion method, it is a top view which illustrates the case where the curve propulsion transmission of this invention and the curve propulsion pipe | tube which has a curved-surface top part are used. It is a whole explanatory view showing a usage pattern of a propulsion transmission inner unit and a propulsion pipe of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Propulsion pipe 1a Propulsion pipe collar 2 Main pushing device 3 Lead conductor 4 Propulsion transmission rod 5 Propulsion transmission inner unit 5a Straight line propulsion transmission inner unit 5b Curved propulsion transmission inner unit 6 Propulsion pipe support member 7 Mud pipe 8 Waste mud pipe 9 Power line 10 Lubricant tube 11 Inner unit tube 11a Tube end surface 11b Tube end edge 12 Connection structure 13 Connection member 14 Cable tray 15 Laser 16 Rail 17 Survey robot 18 Straight line propulsion tube 19 Curved propulsion tube 20 Tube 20a End surface 20b Pipe end edge 21 Pipe 21a End face 21b Pipe end edge 22 Connection structure 23 Top 24 Conventional curve propulsion transmission inner unit 24a Pipe end edge 25 Conventional curve propulsion pipe 25a Pipe end edge 26 Difference in opening length

Claims (11)

  The propulsion pipe used for low load bearing capacity is installed in the propulsion transmission inner unit that transmits the thrust from the main jack every time the frictional resistance between the propulsion pipe and the ground is less than the allowable load bearing capacity of the propulsion pipe A propulsion transmission inner unit used in a curved load propulsion method of a low load resistance system supported by a propulsion pipe support member, wherein the two inner unit pipes are provided at the center of the end face of the pipe. The two inner unit pipes can be brought into contact with each other by pivoting with the coupling structure as a pivot axis. Propeller transmission inner unit for curved lines.   2. The curved propulsion transmission inner unit according to claim 1, wherein the connection structure is a pin structure or a spherical structure.   At least one end surface of the end surfaces where the two inner unit tubes forming the curving propulsion transmission inner unit come into contact with each other has a shape that is inclined as it moves away from the rotating shaft by the connecting structure in the horizontal direction. The propulsion transmission inner unit for curves according to claim 1 or 2, characterized by the above-mentioned.   4. The inner propulsion transmission inner unit for a curve according to claim 1, wherein the inner unit pipe has a square shape having a space inside.   The propulsion pipe used for low load bearing capacity is installed in the propulsion transmission inner unit that transmits the thrust from the main jack every time the frictional resistance between the propulsion pipe and the ground is less than the allowable load bearing capacity of the propulsion pipe A curved propulsion pipe used in a curved load propulsion method of a low load resistance method supported by a propelled pipe support member, wherein the propulsion pipe is a set of two pipes, and the two pipes are centered on the end face. The curve propulsion characterized in that in the abutted state, the end surface of the two pipes can be contacted with each other by rotating in the horizontal direction around the center of the end surface. tube.   6. The propulsion pipe according to claim 5, wherein the end surface where the two tubes abut each other has a shape in which at least one of the end surfaces of the tubes is inclined in a horizontal direction away from the end surface central axis.   The curved propulsion pipe according to claim 5 or 6, wherein the end faces where the two pipes contact each other are connected to each other by an uneven surface or a spherical surface at the center of each end face.   The curved propulsion pipe according to claim 5 or 6, wherein at least one end face of the end face where the two pipes contact each other has a top at the center of the end face.   9. The curved propulsion pipe according to claim 8, wherein the top portion is processed into a curved surface.   The propulsion pipe used for low load bearing capacity is installed in the propulsion transmission inner unit that transmits the thrust from the main jack every time the frictional resistance between the propulsion pipe and the ground is less than the allowable load bearing capacity of the propulsion pipe A low load-bearing type curve propulsion method supported by the propelling pipe support member, wherein the propulsion transmission inner unit according to any one of claims 1 to 4 and the propulsion pipe according to any one of claims 5 to 9 are rotated. The end face has an inclined shape with the same angle, and a plurality of propulsion transmission inner units are arranged inside a plurality of the propulsion pipes connected, and the propulsion pipe and the propulsion transmission inner unit are rotated on the same rotation axis. Curve propulsion method characterized by propulsion.   The curve propulsion method according to claim 10, wherein a straight propulsion transmission inner unit and a straight propulsion pipe are used according to the curvature radius of the construction line.

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