Method for Pushing Up Reinforcing Material and Pushing-Up Fixing Device

Abstract

To provide a method and a device capable of performing a work for pushing up and fixing a reinforcement material into a hollow columnar object more easily than before.SOLUTION: A push-up fixing device 1 comprises: a fixed blade 10 having vanes 12, 13 extending diagonally downward from a central part 11; a core rod 20 hanging from the central part 11 of the fixed blade; a reaction force generation member 30 inserted loosely into the core rod 20; a support nut 40 applying an upward pressure to the reaction force generation member 30 by being screwed with the core rod 20, supporting the reaction force generation member 30 from downward and rotating; a reinforcement material holding member 50 supported by the support nut 40 with the reaction force generation member 30; and a push-up rod 60 for rotating the support nut 40 by abutting onto the support nut 40 from downward and being rotated with the core rod 20 as a rotational axis. An outer peripheral surface of a cylindrical reinforcement material is wrapped and held to the reinforcement material holding member 50.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The invention disclosed herein relates to the installation of a reinforcing material for reinforcing a hollow columnar object such as a utility pole from the inside.

Background Art

[0002] For example, as disclosed in Patent Documents 1 to 3, a technique is known in which an upright hollow columnar object such as a utility pole is reinforced from the inside with a cylindrical fiber reinforcing material. In the technique of Patent Document 1, a flexible inner wire (52) is provided from the tip of the cylindrical reinforcing sheet (40) through the inside of the sheet. This inner wire (52) is used as a pushing rod, and wires are added and connected as necessary to push up the reinforcing sheet (40) inside the hollow columnar object. After that, air pressure is applied to the inside of the reinforcing sheet (40) to press the reinforcing sheet (40) against the wall surface and fix it with an adhesive. In the technique of Patent Document 2, a flexible hollow pipe (4) is provided from the tip of the cylindrical reinforcing sheet (2) through the inside of the sheet. While adding and connecting the required number of similar hollow pipes to this hollow pipe (4) and using it as a pushing rod, the reinforcing sheet (2) is pushed up inside the hollow columnar object. A balloon (6) is provided on the uppermost hollow pipe (4A), and the reinforcing sheet (2) is suspended and held inside the hollow columnar object by the inflation of this balloon (6). In the technique of Patent Document 3, a pressure-resistant hose (23) is used as a pushing rod to push up a pulley (24) and fix it to the top of the inside of the hollow columnar object. This pulley (24) is used to lift and install a cylindrical reinforcing sheet (40).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the case of Patent Document 1, air leakage is likely to occur at the through portion where the internal wire extends from inside the cylinder of the reinforcing sheet to the outside. Furthermore, in order to fill a heavy object such as mortar, the support by the internal wire is insufficient in strength, and there is a concern about the fall of the reinforcing sheet. In the case of Patent Document 2, since a hollow pipe with a total length of 10 m or more is usually required to push up the reinforcing sheet, a plurality of hollow pipes need to be added on-site. However, the connection work has to be carried out inside the cylinder of the reinforcing sheet (that is, in a long and narrow space), and it also takes time such as providing a necessary number of connection work openings in the reinforcing sheet, which is difficult in terms of workability and productivity. In the case of Patent Document 3, it is necessary to insert a fixing device including a pulley in advance before inserting the reinforcing sheet, which involves two steps of inserting the fixing device and then inserting the reinforcing sheet, and the efficiency is poor. Thus, there is room for improvement in the means and methods for pushing up and fixing a cylindrical reinforcing material inside a hollow columnar object.

Means for Solving the Problems

[0005] Considering the above conventional technologies, if a pushing tool can be provided without passing through the inside of the cylinder of the cylindrical reinforcing material, the problems of Patent Document 1 and Patent Document 2 can be solved. Also, if a fixing device with a stronger fixing force than using air pressure is attached to the tip of the reinforcing material and can be inserted together with the reinforcing material, the lack of fixing force can be eliminated, and the problem of Patent Document 3 can also be solved.

[0006] In the present invention, as a pushing and fixing device for pushing up and fixing a reinforcing member in a hollow columnar object, there are provided a fixing blade having at least two blade portions extending obliquely downward from a central portion, a mandrel hanging down from the central portion of the fixing blade, a reaction force generating member loosely inserted into the mandrel, a support nut screwed onto a screw formed on the mandrel to support and rotate the reaction force generating member from below to apply an upward pressure to the reaction force generating member, a cylindrical reinforcing member holding member surrounding the mandrel and supported by the support nut together with the reaction force generating member, and a pushing rod that abuts against the support nut from below to push up the pushing and fixing device and is rotatable about the mandrel as a rotation axis, and rotates the support nut by the rotation operation. A pushing and fixing device is proposed. In this pushing and fixing device, a cylindrical reinforcing member is held by, for example, tightening with a binding band so that its upper end outer peripheral surface is wound around the reinforcing member holding member. Since the reinforcing member holding member surrounds the mandrel, the pushing rod mounted with the mandrel as a rotation axis extends outside the cylinder rather than inside the cylinder of the reinforcing member. Further, when the support nut that rotates according to the rotation operation of the pushing rod applies an upward pressure to the reaction force generating member, the reaction force generating member abuts against the blade portion of the fixing blade and acts to expand the blade portion. The blade portions of the fixing blade inserted and pushed up into the hollow columnar object receive a force in a narrowing direction where the tips hit the inner wall surface of the hollow columnar object, but the expanding pressure by the reaction force generating member becomes a reaction force against this. When the tip of the blade portion is pressed against the inner wall surface of the hollow columnar object by this reaction force, the tip of the blade portion bites into the wall surface like a barb such as a needle or an arrowhead. Thereby, the pushing and fixing device is fixed in the hollow columnar object.

[0007] According to the present invention, there is provided a pushing-up method for pushing up a cylindrical reinforcing member inside a hollow columnar object. The outer peripheral surface of the upper end of the cylindrical reinforcing member is brought into contact with and fixed to the outer surface of a reinforcing member holding member, and a flexible pushing-up rod used for pushing up the reinforcing member holding member is disposed through the outside of the cylinder of the reinforcing member from the reinforcing member holding member. The inserted reinforcing member holding member is pushed up inside the hollow columnar object using the pushing-up rod disposed outside the cylinder of the reinforcing member through a working hole opened in the hollow columnar object. A pushing-up method is proposed.

Effect of the Invention

[0008] According to the pushing-up method and the pushing-up fixing device according to the above proposal, since the pushing-up rod extends through the outside of the cylindrical reinforcing member, there is no worry about air leakage, and the work of adding the pushing-up rod and the work of removing the pushing-up rod after fixing can be performed outside the cylinder of the reinforcing member, which is simple. Further, in the pushing-up fixing device according to the above proposal, since the fixing is performed by the biting-in of the fixing blade into the wall surface, the fixing force is stronger than that of those supported by a wire or using air pressure. And since this pushing-up fixing device is provided at the tip of the reinforcing member and can be inserted and pushed up together with the reinforcing member, there is no need for double work as in Patent Document 3.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0010] Regarding a concrete utility pole as an example of a hollow columnar object, a pushing-up fixing device 1 for pushing up and fixing a reinforcing material therein will be described. The pushing-up fixing device 1 according to the present embodiment shown in FIGS. 1 to 3 includes a fixing blade 10, a core rod 20, a reaction force generating member 30, a support nut 40, a reinforcing material holding member 50, and a pushing-up rod 60.

[0011] The fixing blade 10 is made of a metal plate such as stainless steel and includes two wing portions 12 and 13 extending obliquely downward from a central portion 11, and as a whole, it exhibits a shape of an arrowhead with a barb (inverted V shape). The wing portions 12 and 13 extending obliquely downward can increase the number of created pieces, such as increasing the number to three or four as needed. Alternatively, a form in which the central portion 11 and the wing portions 12 and 13 are used as one part and a plurality of such parts are stacked and used is also possible. A through hole is provided in the central portion 11, and in the present embodiment, the upper end of the core rod 20 using a bolt threaded over the entire length is passed through the through hole. With respect to this core rod 20, a socket nut 14 is tightened from above, and a fixing nut 15 is tightened from below, and the central portion 11 is sandwiched and fixed by both nuts 14 and 15. Reinforcing ribs 12a and 13a are formed on at least one side edge of each of the wing portions 12 and 13 to increase the strength.

[0012] The core rod 20 is a bolt threaded over the entire length as described above, is attached to the central portion 11 of the fixing blade 10 with nuts 14 and 15, and hangs down between the wing portions 12 and 13 of the fixing blade 10. The reaction force generating member 30 is loosely inserted into this core rod 20, that is, passed through so as to be vertically movable. The reaction force generating member 30 of the present embodiment is disk-shaped with a loose insertion hole 31 for passing the core rod formed in the center (FIG. 2C), and is integrally formed with a reinforcing material holding member 50 described later.

[0013] The support nut 40 is a hexagonal nut in this embodiment and is screwed with the mandrel 20 which is a bolt to support the reaction force generating member 30 from below. The support nut 40 screwed to the mandrel 20 can be moved up and down along the mandrel 20 by rotation. When rotated in the upward direction, an upward pressure is applied to the supported reaction force generating member 30. This support nut 40 is provided with two engaging recesses 41 on the lower end surface, and two engaging protrusions 61 protruding from the upper end surface of the push rod 60 are engaged therewith. By this engagement, the support nut 40 can be rotated by turning the push rod 60. It is sufficient to have at least one combination of the engaging recess 41 and the engaging protrusion 61, but having two or more combinations enables more stable rotation.

[0014] The reinforcing material holding member 50 is cylindrical and surrounds the mandrel 20, and its inner diameter is larger than the outer diameter of the support nut 40. The reinforcing material holding member 50 of this embodiment is integrally formed with the reaction force generating member 30 by means such as cutting, casting, pressing, welding, etc. Specifically, it is formed as a cylindrical portion (cylindrical side wall) that surrounds the loose insertion hole 31 of the reaction force generating member 30 and extends from the lower surface of the reaction force generating member 30. However, the reinforcing material holding member 50 may be formed as a separate part as long as it is supported by the support nut 40 together with the reaction force generating member 30. A flange portion 51 is provided around the outer periphery of the lower end of the reinforcing material holding member 50 according to this embodiment, and this flange portion 51 functions as a catch when holding the reinforcing material and enhances the reinforcing material holding force.

[0015] The pushing rod 60 uses a flexible pressure-resistant resin tube, and its inner diameter is wider than the outer diameter of the mandrel 20. The upper end of the pushing rod 60 is inserted from the lower end of the mandrel 20 and abutted against the support nut 40 from below to push up the pushing fixing device 1. The pushing rod 60 with its upper end surface abutted against the support nut 40 can be rotated with the mandrel 20 as the rotation axis. And since the engaging convex portion 61 formed on the upper end surface fits into the engaging concave portion 41, when the lower part of the pushing rod 60 is held by hand and rotated, the support nut 40 can be rotated. The pushing rod 60 of the present embodiment using a pressure-resistant resin tube has sufficient strength for pushing up the pushing fixing device 1, that is, pressure resistance and bending resistance. At the lower end of the pushing rod 60, a connection bolt 62 for connecting a splicing extension rod 60' made of the same pressure-resistant resin tube is attached. The extension rod 60' has a connection bolt 61' screwed to the connection bolt 62 at the upper end and a connection bolt similar to the connection bolt 62 of the pushing rod 60 at the lower end.

[0016] As shown in FIG. 4, a cylindrical reinforcing material 70 is attached to the reinforcing material holding member 50. The reinforcing material 70 is formed by sewing a fabric sheet of reinforcing fibers into a cylindrical shape. In the case of the present embodiment, the upper end portion of the filling material supply pipe 71 (shown by a dotted line) extending through the reinforcing material 70 is sewn to the inner surface of the upper end of the reinforcing material 70 (that is, inside the cylinder). This filling material supply pipe 71 is a pipe such as the hollow pipe (4) in Patent Document 2 used for feeding a filling material such as mortar. However, in the case of the present embodiment, the filling material supply pipe 71 does not require the strength to push up and support the pushing fixing device 1 and the reinforcing material 70. The reinforcing material 70 is flattened and folded by being crushed as indicated by the arrow in FIG. 4A, and its upper end outer peripheral surface is wound around the reinforcing material holding member 50. By tightening the wound reinforcing material 70 with a metal binding band 72, the reinforcing material 70 is held by the reinforcing material holding member 50. At this time, the flange portion 51 provided around the outer periphery of the lower end of the reinforcing material holding member 50 functions as a catch for the reinforcing material 70, preventing the displacement of the reinforcing material 70.

[0017] Since the outer peripheral surface of the folded reinforcing member 70 is wound around the reinforcing member holding member 50, as shown in FIG. 4B, the pushing rod 60 that is mounted and extended with the mandrel 20 as the rotation axis is outside the cylinder of the reinforcing member 70 rather than inside the cylinder of the reinforcing member 70 and extends. Therefore, there is no need to make holes in the reinforcing member 70 for the operation of the pushing rod 60, and there is no need to worry about air leakage. Moreover, the work of adding the pushing rod and the work of removing the pushing rod after fixing can be performed outside the cylinder of the reinforcing member 70, which is simple.

[0018] The above pushing and fixing device 1 is installed inside the utility pole by applying the pushing and fixing process shown in FIGS. 2 to 9 of Patent Document 2. Since it is described in detail in Patent Document 2, only the main part will be outlined here with reference to FIG. 5.

[0019] As shown in FIG. 4A, the cylindrical reinforcing member 70 is flattened by being crushed and folded, and its upper end outer peripheral surface is brought into contact with and wound around the outer surface of the reinforcing member holding member 50. The wound reinforcing member 70 is tightened with a binding band 72 and fixed to the reinforcing member holding member 50. Before or after this operation, the fixing blade 10, the mandrel 20, the reaction force generating member 30 (integrated with the reinforcing member holding member 50 in this embodiment), the support nut 40, and the pushing rod 60 used to push up and fix the reinforcing member holding member 50 are assembled. In the assembled pushing and fixing device 1, the pushing rod 60 used to push up the reinforcing member holding member 50 is arranged outside the cylinder of the reinforcing member 70 from the reinforcing member holding member 50 as described above.

[0020] FIG. 5A shows the insertion operation. From the work hole opened at an appropriate position of the utility pole, the pushing and fixing device 1 (simplified and shown in FIG. 5) including the reinforcing member holding member 50 holding the reinforcing member 70 is inserted into the utility pole. Insert it. At this time, as shown in the figure, the push-up rod 60 is outside the cylinder of the reinforcing material 70. Fig. 5B shows the pushing-up operation. The pushing-up operation of pushing up the push-up fixing device 1 inside the utility pole is performed using the push-up rod 60 arranged outside the cylinder of the reinforcing material 70 (see also Fig. 4B), and the push-up fixing device 1 is pushed up to the required height by adding an extension rod 60' as needed. For example, in the case of Patent Document 2 of the prior art, this pushing-up process is performed with a hollow pipe (4) arranged through the inside of a cylindrical reinforcing sheet (2). On the contrary, according to the pushing-up method of the present embodiment, since it is performed with the push-up rod 60 arranged outside the cylinder of the reinforcing material 70 instead of inside the cylinder of the reinforcing material 70, there is no need to make holes in the reinforcing material 70 for the operation of the push-up rod 60, and there is no need to worry about air leakage. Moreover, the operation of adding the push-up rod and the operation of removing the push-up rod after fixing can be performed outside the cylinder of the reinforcing material 70, which is simple.

[0021] In the push-up fixing device 1 pushed up inside the utility pole, the wing portions 12, 13 of the fixing blade 10 receive a force in the direction in which the distance between them decreases as the respective tips contact the inner wall surface of the utility pole (Fig. 1). In this state, when the push-up rod 60 (extension rod 60' added thereto) is rotated, and the support nut 40 is rotated by this rotation operation (in the upward direction), an upward pressure can be applied from the support nut 40 to the reaction force generating member 30. The reaction force generating member 30 receiving the upward pressure abuts against the lower surfaces of the wing portions 12, 13 of the fixing blade 10 and acts to expand these wing portions 12, 13. The expanding pressure by this reaction force generating member 30 becomes a reaction force against the force trying to narrow the wing portions 12, 13 and acts to press the tips of the wing portions 12, 13 against the inner wall surface of the utility pole. Therefore, the tips of the wing portions 12, 13 bite into the wall surface, and the push-up fixing device 1 is mechanically fixed inside the utility pole. This fixing by the biting-in of the wing portions 12, 13 has a much stronger fixing force than those using a wire for support or using air pressure as in Patent Documents 1 and 2. Also, since the reinforcing material 70 and the push-up fixing device 1 are inserted into the utility pole and pushed up together, the push-up fixing process is completed at once, and there is no need for double work as in Patent Document 3.

[0022] Figure 5C shows the state after the pressing-up fixing device 1 is fixed, and the pressing-up rod 60 after the pressing-up fixing device 1 has been fixed is being pulled out and recovered. The lower part of the reinforcing member 70 is inserted through the working hole and hung downwards, and the reinforcing member 70 is installed in a state covering almost the entire length of the utility pole. After this, a filling material such as mortar is supplied using the filling material supply pipe 71.

[0023] The present invention may also have the following configuration. A pressing-up method for pressing up a cylindrical reinforcing member inside a hollow columnar object, wherein the outer peripheral surface of the upper end of the cylindrical reinforcing member is brought into contact with and fixed to the outer surface of the reinforcing member holding member, a flexible pressing-up rod used for pressing up the reinforcing member holding member is disposed through the outside of the cylinder of the reinforcing member from the reinforcing member holding member, the reinforcing member holding member is inserted through a working hole opened in the hollow columnar object, and the inserted reinforcing member holding member is pressed up inside the hollow columnar object using the pressing-up rod disposed outside the cylinder of the reinforcing member.

Explanation of Signs

[0024] 1 Pressing-up fixing device 10 Fixing blade 11 Central part 12, 13 Wing parts 20 Core rod 30 Reaction force generating member 31 Loose insertion hole 40 Support nut 41 Engagement concave part 50 Reinforcing member holding member 51 Flange part 60 Pressing-up rod 61 Engagement convex part 70 Reinforcing member

Claims

1. A reinforcing member pushing and fixing device having a cylindrical reinforcing member and a pushing and fixing device for pushing up and fixing in a hollow columnar object, wherein the pushing and fixing device includes, a mandrel, a cylindrical reinforcing member holding member surrounding the mandrel, and a pushing rod for pushing up the pushing and fixing device, wherein a fixing blade having at least two wing portions extending obliquely downward for fixing the reinforcing member pushing and fixing device in the hollow columnar object is fixed to the mandrel, and a reaction force generating member integrally formed with the reinforcing member holding member for pressing the fixing blade against the inner wall surface of the hollow columnar object is loosely inserted, a support nut that is screwed onto a screw of the mandrel to support the reaction force generating member from below and applies an upward pressure to the reaction force generating member by rotating is connected to the pushing rod, the reinforcing member is held by a binding band so that the outer circumference of the reinforcing member at its upper end is wound around the reinforcing member holding member, a reinforcing member pushing and fixing device.

2. The reinforcing member pushing and fixing device according to claim 1, wherein a filler supply pipe extending through the reinforcing member is attached to the inner surface of the upper end of the reinforcing member.

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