JP7574260B2 - Guard cable tensioning device - Google Patents

Description

The present invention relates to a guard cable tensioning device.

As a guardrail to be installed, for example, on the side of a roadway or in a median strip, a guardrail X has been proposed that has a structure that uses the flexure of a guard cable 50 to absorb the impact of a vehicle collision, as shown in Figure 20.

Specifically, this protective fence X is made up of posts 60 erected at intervals and guard cables 50 installed between these posts 60, with a bolt shaft 51 at the end of the guard cable 50 passing through a hole in the post 60 located at the end of the protective fence X, and with the guard cable 50 tensioned, a nut 52 screwed onto the bolt shaft 51 (male threaded portion 51a) prevents it from coming loose. Generally, the guard cables 50 are installed in three to five stages vertically.

As mentioned above, when constructing the protective fence X, the guard cable 50 is kept taut to prevent it from coming loose. However, the guard cable 50 may stretch and become loose due to heat from the summer sun or over time. In such cases, the guard cable 50 must be tensioned.

Conventionally, the guard cable 50 is tensioned by pulling the guard cable 50 using a chain block 55 as shown in FIG. 21, and then screwing the nut 52 screwed onto the bolt shaft 51 until it abuts against the support 60. However, it is difficult to pull the guard cable 50 by operating the handle 55a, which requires a lot of human force. Therefore, there is a need to propose a means for easily, quickly, and satisfactorily tensioning the guard cable 50.

The present invention was developed in consideration of the above-mentioned problems, and provides a highly practical guard cable tensioning device that has never existed before.

The gist of the present invention will be explained with reference to the attached drawings.

A guard cable tensioning device for tensioning a guard cable 50 by pulling a bolt shaft 51 provided at an end of the guard cable 50 and disposed in a state of penetrating a support 60, the device comprising: a device main body 1 provided with an abutment portion 2 that abuts against a side peripheral surface 60a of the support 60; a bolt shaft connecting portion 3 connected to the bolt shaft 51; and a device for pulling the bolt shaft connecting portion 3 connected to the bolt shaft 51 in a direction away from the support 60 with the abutment portion 2 provided on the device main body 1 abutted against the support 60. and an extension bar 8 having one end connected to the bolt shaft 51 and the other end connected to the bolt shaft connecting portion 3, and the abutment portion 2 is composed of a concave first abutment portion 2A which is detachably provided on the device main body 1 and fits into and abuts on the curved side peripheral surface 60a' of a support 60' having a circular cross section, and a flat second abutment portion 2B which is exposed when the first abutment portion 2A is removed and abuts on the flat side peripheral surface 60a of the support 60 having a square cross section.

The guard cable tensioning device described in claim 1 is characterized in that the bolt shaft connecting portion 3 is composed of a female screw hole member 3a that is screwed onto the bolt shaft 51.

The guard cable tensioning device according to claim 1 or 2 is characterized in that the pulling means 4 includes a fluid pressure drive main body 4A provided on the device main body 1, and a drive shaft 4B provided on the fluid pressure drive main body 4A so as to be movable forward and backward, and having the bolt shaft connecting portion 3 at its tip.

The guard cable tensioning device according to any one of claims 1 and 2 relates to a guard cable tensioning device characterized in that the device body 1 is provided with a retraction means arrangement section 5 in which the retraction means 4 is detachably arranged at a rear facing position of the abutment section 2.

The guard cable tensioning device described in claim 3 is characterized in that the device body 1 is provided with a retraction means arrangement section 5 in which the retraction means 4 is detachably arranged at a rear facing position of the abutment section 2.

The present invention also relates to a guard cable tensioning device as described in any one of claims 1 and 2, characterized in that the device main body 1 is provided with a clamping and fixing portion 6 for clamping and fixing the device main body 1 to the support 60.

The present invention also relates to a guard cable tensioning device as described in claim 3, characterized in that the device main body 1 is provided with a clamping and fixing portion 6 for clamping and fixing the device main body 1 to the support 60.

The present invention also relates to a guard cable tensioning device as described in claim 4, characterized in that the device main body 1 is provided with a clamping and fixing portion 6 for clamping and fixing the device main body 1 to the support 60.

The present invention also relates to a guard cable tensioning device as described in claim 5, characterized in that the device main body 1 is provided with a clamping and fixing portion 6 for clamping and fixing the device main body 1 to the support 60.

The guard cable tensioning device described in claim 6 is characterized in that the clamping and fixing part 6 is configured by providing a pair of left and right clamping members 6a at the front part of the abutting part 2 so that they can be moved toward and away from each other.

The guard cable tensioning device described in claim 7 is characterized in that the clamping and fixing part 6 is configured by providing a pair of left and right clamping members 6a at the front part of the abutting part 2 so that they can be moved toward and away from each other.

The guard cable tensioning device described in claim 8 is characterized in that the clamping and fixing part 6 is configured by providing a pair of left and right clamping members 6a at the front part of the abutting part 2 so that they can be moved toward and away from each other.

The guard cable tensioning device described in claim 9 is characterized in that the clamping and fixing part 6 is configured by providing a pair of left and right clamping members 6a at the front part of the abutting part 2 so that they can be moved toward and away from each other.

The present invention is configured as described above, making it an unprecedented and highly practical guard cable tensioning device that allows for easy and quick tensioning of the guard cable.

FIG. 1 is a perspective view showing a first embodiment. FIG. 2 is an exploded perspective view showing the first embodiment. FIG. 2 is a cross-sectional view illustrating a main part of the first embodiment. 1A to 1C are explanatory diagrams of the tensioning operation of the guard cable 50 using the first embodiment. 1A to 1C are explanatory diagrams of the tensioning operation of the guard cable 50 using the first embodiment. 1A to 1C are explanatory diagrams of the tensioning operation of the guard cable 50 using the first embodiment. 1A to 1C are explanatory diagrams of the tensioning operation of the guard cable 50 using the first embodiment. 1A to 1C are explanatory diagrams of the tensioning operation of the guard cable 50 using the first embodiment. 1A to 1C are explanatory diagrams of the tensioning operation of the guard cable 50 using the first embodiment. 1A to 1C are explanatory diagrams of the tensioning operation of the guard cable 50 using the first embodiment. FIG. 2 is a perspective view showing the extension bar 8. 10 is an explanatory diagram of the tensioning operation of the guard cable 50 using the extension bar 8 in the first embodiment. FIG. 10 is an explanatory diagram of the tensioning operation of the guard cable 50 using the extension bar 8 in the first embodiment. FIG. 10 is an explanatory diagram of the tensioning operation of the guard cable 50 using the extension bar 8 in the first embodiment. FIG. 10 is an explanatory diagram of the tensioning operation of the guard cable 50 using the extension bar 8 in the first embodiment. FIG. 10 is an explanatory diagram of the tensioning operation of the guard cable 50 using the extension bar 8 in the first embodiment. FIG. FIG. 11 is a perspective view showing a second embodiment. FIG. 11 is an exploded perspective view showing a second embodiment. FIG. 11 is an explanatory diagram of a usage state of the second embodiment. 1 is an explanatory diagram of a protective fence consisting of posts 60 and guard cables 50. FIG. 1 is an explanatory diagram of a conventional tensioning operation for a guard cable 50 using a chain block 55. FIG.

The preferred embodiment of the present invention will be briefly explained below, showing the operation of the invention based on the drawings.

The abutment portion 2 provided on the device body 1 is abutted against the side surface 60a of the support 60, and the bolt shaft connecting portion 3 is connected to the penetration portion of the bolt shaft 51 that is disposed in a penetrating state through the support 60. In this state, when the bolt shaft connecting portion 3 is pulled in a direction away from the support 60 by the pulling means 4, the guard cable 50 becomes tensioned.

As a result, pulling the guard cable 50 does not rely on human power, and tensioning the guard cable 50 can be done easily and quickly.

Example 1
A specific embodiment 1 of the present invention will be described with reference to the drawings.

This embodiment is a guard cable tensioning device for tensioning the guard cable 50 by pulling the bolt shaft 51 that is provided at the end of the guard cable 50 and is disposed in a penetrating state in the support 60, and is equipped with a device main body 1 provided with an abutment portion 2 that abuts against the side peripheral surface 60a of the support 60, a bolt shaft connecting portion 3 that connects to the bolt shaft 51, and a pulling means 4 that is provided on the device main body 1 and pulls the bolt shaft connecting portion 3 connected to the bolt shaft 51 in a direction away from the support 60 when the abutment portion 2 is abutted against the support 60.

The guard fence X, in which the tensioning of the guard cable 50 is performed using this embodiment, has the existing structure described above, and is composed of posts 60 erected at intervals as shown in FIG. 11, and guard cables 50 (four above and below) stretched between these posts 60. A bolt shaft 51 at the end of the guard cable 50 is inserted through a hole in the post 60 located at the very end of the guard fence X, and the guard cable 50 is secured in place by a nut 52 screwed onto the bolt shaft 51 (male threaded portion 51a) that is inserted through the post 60 while the guard cable 50 is tensioned. Reference numeral 53 denotes a connecting member for connecting the guard cable 50 and the bolt shaft 51, and 61 denotes a reinforcing post.

The following provides a detailed explanation of each component of this embodiment.

The device main body 1 is a frame structure formed from suitable metal members as shown in Figures 1 and 2, and is composed of a front member 1a and a rear member 1b arranged in opposing front-to-rear positions, and a pair of upper and lower installation members 1c installed between the upper and lower ends of the front member 1a and the rear member.

The front member 1a that constitutes the device main body 1 is a vertical plate-like body that has an appropriate area and is rectangular when viewed from the front, is concave toward the front, and is configured as an abutment part 2 that abuts against the side surface 60a of the support 60 in a fitting (embracing) state.

In addition, a through hole 1a' is provided in the center of this abutment portion 2 (front member 1a).

This through hole 1a' is a portion for inserting the bolt shaft 51 that is disposed in a penetrating state through the support 60 with the abutment portion 2 abutting against the side peripheral surface of the support 60.

Therefore, when the abutment portion 2 is abutted against the side surface 60a of the support 60, the bolt shaft 51 inserted through the through hole 1a' is disposed inside the device body 1.

The rear member 1b constituting the device main body 1 is a vertical plate-like body having an appropriate area and a rectangular shape when viewed from the front, and a through hole 1b' is provided in the center of this rear member 1b.

This through hole 1b' is an engagement recess for engaging the tip end (locking protrusion 4a) of the fluid pressure drive main body 4A when the pulling means 4 (drive shaft 4B) described later is inserted therethrough, and the rear member 1b is configured as the pulling means arrangement section 5 in which the pulling means 4 is detachably arranged.

The upper and lower installation members 1c constituting the device main body 1 are horizontal plate-like bodies having a rectangular shape in a plan view and having an appropriate length, and a reinforcing plate 1c' that is installed between the front member 1a and the rear member 1b is protruded from the inner surface of each installation member 1c. The device main body 1 may be configured so that the opposing distance between the abutment portion 2 and the retraction means arrangement portion 5 is variable (the installation members 1c may be configured to expand and contract).

The tip of the device body 1 (the tip of the upper installation member 1c) is provided with a clamping and fixing part 6 that clamps and fixes it to the support 60.

This clamping and fixing part 6 is configured by providing a pair of left and right clamping members 6a at the front part of the abutment part 2 so that they can be moved toward and away from each other, as shown in Figures 1 and 2.

Specifically, in this embodiment, clamping members 6a are provided at the left and right ends of a frame member 6b that is U-shaped in plan view and is provided at the tip of the device body 1, and one of the left and right clamping members 6a is provided on a movable member 6c that is screwed to the end of the frame member 6b so that it can move back and forth. The movement direction of this movable member 6c (clamping member 6a) is set to a direction perpendicular to the longitudinal direction of the device body 1.

The clamping and fixing part 6 is therefore provided such that one clamping member 6a can be moved towards and away from the other clamping member 6a, and the clamping and fixing part 6 can clamp the support 60 with the abutment part 2 abutting against the side surface 60a of the support 60, and the device main body 1 is fixed to the support 60 via this clamping and fixing part 6.

In addition, a handle portion 7 is provided on the outer surface of each of the installation members 1c.

The bolt shaft connecting portion 3 is composed of a female screw hole member 3a that screws into the bolt shaft 51 as shown in Figures 1 to 3, and is rotatably mounted on the tip of the drive shaft portion 4B of the pulling means 4, which will be described later.

Therefore, the bolt shaft connecting portion 3 can be screwed and connected to the bolt shaft 51 (male thread portion 51a) disposed inside the device main body 1 while being threaded thereon.

As shown in Figures 1 and 2, the pulling means 4 is composed of a single-acting type fluid pressure cylinder device S1 (hydraulic cylinder) equipped with a cylinder-structured fluid pressure drive main body 4A (cylinder tube) provided in the device main body 1, a drive shaft portion 4B (piston rod) provided on the fluid pressure drive main body 4A so as to be movable back and forth and having a bolt shaft connection portion 3 at its tip, and a fluid pressure pump device S2 (hydraulic pump) that pumps the working fluid (oil) to the fluid pressure cylinder device S1.

Therefore, when the fluid pressure pump device S2 is operated (the handle 4C is raised and rotated), the working fluid is introduced into the fluid pressure cylinder device S1 (fluid pressure drive main body 4A) and the drive shaft 4B contracts. Conversely, when the drive shaft 4B is to be extended, the high pressure state of the working fluid is released and the drive shaft 4B returns (extends) via a biasing mechanism (not shown) provided in the fluid pressure drive main body 4A.

The tip of the fluid pressure drive main body 4A is provided with a locking protrusion 4a that engages with the retraction means arrangement section 5 (through hole 1b') of the device main body 1.

In this embodiment, hydraulic pressure is used as the fluid pressure for moving the drive shaft 4B forward and backward, but air pressure may also be used.

The following describes the tensioning operation of the guard cable 50 using the guard cable tensioning device of this embodiment configured as described above.

First, the device body 1 is fixed to the support 60 of the protective fence X via the clamping and fixing part 6 (see Figures 4 and 5).

Specifically, the bolt shaft 51 (male thread portion 51a) is provided at the end of the guard cable 50 to be worked on and protrudes from the side peripheral surface 60a of the support 60 so that the bolt shaft 51 (male thread portion 51a) is inserted into the through hole 1a' and the abutment portion 2 is brought into abutment against the side peripheral surface 60a of the support 60 so that the bolt shaft 51 (male thread portion 51a) is positioned inside the device body 1. In this state, one of the clamping members 6a of the clamping and fixing portion 6 is moved closer to the other clamping member 6a to clamp and fix it to the support 60.

Next, the pulling means 4 is provided on the device body 1, and the bolt shaft connecting part 3 is connected to the bolt shaft 51 (see Figures 6 and 7).

Specifically, the drive shaft portion 4B of the pulling means 4 is inserted through the pulling means arrangement portion 5 (through hole 1b') of the device body 1, and in this state the bolt shaft connecting portion 3 is rotated and screwed to the bolt shaft 51. At this time, the nut 52 screwed onto the bolt shaft 51 (male thread portion 51a) is screwed to a position where it abuts against the bolt shaft connecting portion 3, and the double nut effect prevents the bolt shaft connecting portion 3 from coming off the bolt shaft 51.

Then, when the pulling means 4 is operated to pull the bolt shaft connecting part 3 in a direction away from the support 60, the bolt shaft 51 is pulled, and the tip part (locking protrusion 4a) of the fluid pressure drive main body part 4A engages and locks with the through hole 1b', and the bolt shaft 51 is further pulled, causing the guard cable 50 to become taut (see Figure 8). Note that the taut state of the guard cable 50 in this embodiment means that the entire pulled guard cable 50 becomes in a state with no slack (horizontal state) between the support posts 60.

Next, use a tool or the like to screw the nut 52 into a position where it abuts against the side surface 60a of the support 60, thereby maintaining tension on the guard cable 50 (see Figure 9).

Next, the bolt shaft connecting portion 3 is removed from the bolt shaft 51 to complete the tensioning operation (see Figure 10).

Then, perform tensioning on the other guard cables 50 in the same manner.

In this embodiment, an extension bar 8 is provided, one end of which is connected to the bolt shaft 51 and the other end of which is connected to the bolt shaft connecting portion 3.

Specifically, the extension bar 8 is a round bar-shaped body made of an appropriate metal material as shown in Figures 11(a) and (b), and has a first connecting portion 8a (female thread) at the tip end that is screwed onto the bolt shaft 51 while being fitted thereon, and a second connecting portion 8b (male thread) at the base end that is screwed onto the bolt shaft connecting portion 3 while being fitted thereon, and in this embodiment, two different lengths are available.

The amount of protrusion of the bolt shaft 51 (male thread portion 51a) from the side surface 60a of the support 60 described above is not always constant, but varies depending on the degree of slack in each guard cable 50. Also, since there is a limit to the stroke amount of the drive shaft portion 4B (piston rod), it is possible to prepare multiple device bodies 1 of different lengths and select the device body 1 that matches the amount of protrusion to perform the work, but it is bulky and cumbersome to carry multiple device bodies 1 each time.

In this regard, as described above, this embodiment has multiple extension bars 8 of different lengths, which not only accommodates the amount of protrusion of the bolt shaft 51, but also makes it compact, easy to carry, and easy to use.

The following describes the tensioning operation of the guard cable 50 using the extension bar 8 with the guard cable tensioning device of this embodiment.

As shown in Figure 12, an extension bar 8 is selected that matches the amount of protrusion of the bolt shaft 51 (male thread portion 51a) protruding from the side peripheral surface 60a of the support 60, and this extension bar 8 (first connecting portion 8a) is connected to the bolt shaft 51 (see Figure 13). At this time, if there is a gap between the nut 52 screwed onto the bolt shaft 51 (male thread portion 51a), the nut 52 is screwed to a position where it abuts against the end of the extension bar 8, and the double nut effect prevents the extension bar 8 from coming off the bolt shaft 51.

Next, the drive shaft portion 4B of the retraction means 4 is inserted through the retraction means arrangement portion 5 (through hole 1b') of the device body 1, and in this state, the bolt shaft connection portion 3 is rotated around its axis to screw-connect it to the extension bar 8 (second connection portion 8b) (see Figures 13 and 14).

Then, the pulling means 4 is operated to pull the bolt shaft connecting part 3 in a direction away from the support 60, thereby pulling the bolt shaft 51. After the tip of the fluid pressure drive main body part 4A (locking protrusion 4a) engages and locks with the through hole 1b', the bolt shaft 51 is further pulled, and the guard cable 50 becomes taut (see Figure 15).

Next, use a tool or the like to screw the nut 52 into a position where it abuts against the side surface 60a of the support 60 to maintain tension on the guard cable 50, and then remove the extension bar 8 from the bolt shaft 51 to complete the tensioning process (see Figure 16).

Since this embodiment is configured as described above, pulling the guard cable 50 does not rely on human power, so tensioning the guard cable 50 can be done easily and quickly, and because it is a simple structure rather than a large one, it is inexpensive and suitable for mass production.

In addition, in this embodiment, the bolt shaft connecting portion 3 is composed of a female threaded hole member 3a that screws into the bolt shaft 51, so that the retraction means 4 can be firmly connected to the bolt shaft 51 easily and quickly.

In addition, in this embodiment, the pulling means 4 is equipped with a fluid pressure driven main body 4A provided on the device main body 1, and a drive shaft 4B that is provided on the fluid pressure driven main body 4A so as to be movable back and forth and has a bolt shaft connecting portion 3 at its tip. Therefore, the structure that utilizes fluid pressure makes it easy to tension the guard cable 50.

In addition, in this embodiment, the device body 1 is provided with a retraction means arrangement section 5 in which the retraction means 4 is detachably arranged at a position facing the rear of the abutment section 2, so that attachment and detachment to and from the support 60 can be easily and quickly achieved, and the device can be made compact, making it convenient to carry and store when not in use.

In addition, in this embodiment, the device body 1 is provided with a clamping and fixing part 6 that clamps and fixes the cable to the support 60, so that the tensioning of the guard cable 50 can be performed easily and quickly.

In addition, in this embodiment, the clamping and fixing part 6 is configured by providing a pair of left and right clamping members 6a at the front part of the abutting part 2 so that they can be moved toward and away from each other, so that the above-mentioned effects can be reliably achieved.

In addition, this embodiment is equipped with an extension bar 8, one end of which is connected to the bolt shaft 51 and the other end of which is connected to the bolt shaft connecting part 3. This not only allows it to accommodate the amount of protrusion of the bolt shaft 51, but also makes it compact, easy to carry, and easy to use.

Example 2
A second specific embodiment of the present invention will be described with reference to the drawings.

In this embodiment, a contact portion 2 with a different structure is provided at the front end of the device body 1.

Specifically, this contact part 2 is composed of a first contact part 2A that is detachably attached to the front end part of the device main body 1, and a second contact part 2B that is composed of the front surface of the front end part that is exposed when the first contact part 2A is removed.

The first contact portion 2A is composed of a plate-like body 10 made of an appropriate metal member as shown in Figures 17 and 18, and this plate-like body 10 is formed with a concave shape facing forward, and a connecting piece 10a is provided at the upper and lower ends of the plate-like body 10, which protrudes backward and overlaps with the upper and lower surfaces of the device main body 1, and this connecting piece 10a is detachably attached to the front end of the device main body 1 via a fastening member 11 (screw member).

This first contact portion 2A is used as the contact portion 2 that comes into contact in a fitted (embracing) state with the curved side peripheral surface 60a of a support 60 (mainly a road shoulder support) that has a circular cross section.

The second contact portion 2B is configured by providing a flat front surface at the front end of the device body 1, as shown in FIG. 18.

This second contact portion 2B is used as the contact portion 2 that comes into face contact with the flat side peripheral surface 60a' of a support 60' (mainly a support for a median strip) that has a square cross section (see Figure 19).

In addition, through holes 1a', 10a' are provided in the center of this contact portion 2 (the front member 1a of the second contact portion 2B and the plate-like body 10 of the first contact portion 2A).

The through holes 1a', 10a' are used to insert the bolt shaft 51 that is disposed in a penetrating state through the pillars 60, 60' when the abutment portion 2 is in contact with the side peripheral surfaces 60a, 60a' of the pillars 60, 60'.

Therefore, when the abutment portion 2 is abutted against the side peripheral surfaces 60a, 60a' of the posts 60, 60', the bolt shaft 51 inserted through the through holes 1a', 10a' is disposed inside the device body 1.

The rest is the same as in Example 1.

The present invention is not limited to Examples 1 and 2, and the specific configuration of each component can be designed as appropriate.

1 Device body 2 Contact part
2A first contact part
2B second contact part
3 Bolt shaft connecting portion 3a Female screw hole member 4 Pulling means 4A Fluid pressure driving main body portion 4B Drive shaft portion 5 Pulling means arrangement portion 6 Clamping and fixing portion 6a Clamping member 8 Extension bar
50 Guard Cable
51 Bolt shaft
60 Supports
60' support
60a' curved side surface
60a Side circumferential surface /flat side circumferential surface

Claims (13)

1. A guard cable tensioning device for tensioning a guard cable by pulling a bolt shank that is provided at an end of the guard cable and disposed in a state where it penetrates a support, the guard cable tensioning device comprising: a device main body provided with an abutment portion that abuts against a side peripheral surface of the support; a bolt shank connecting portion connected to the bolt shank; pulling means that is provided on the device main body and pulls the bolt shank connecting portion connected to the bolt shank in a direction away from the support when the abutment portion is abutted against the support; and an extension bar having one end connected to the bolt shank and the other end connected to the bolt shank connecting portion, the abutment portion comprising: a first abutment portion that is detachably provided on the device main body and has a concave shape that fits and abuts against the curved side peripheral surface of the support having a circular cross section; and a second flat abutment portion that is exposed when the first abutment portion is removed and abuts against the flat side peripheral surface of the support having a square cross section . A guard cable tensioning device according to claim 1, characterized in that the bolt shaft connection part is composed of a female threaded hole member that is screwed onto the bolt shaft. A guard cable tensioning device according to any one of claims 1 and 2, characterized in that the pulling means comprises a fluid pressure driven main body provided on the device main body, and a drive shaft provided on the fluid pressure driven main body so as to be movable forward and backward, the bolt shaft connecting portion being provided at the tip of the drive shaft. A guard cable tensioning device according to any one of claims 1 and 2, characterized in that the device body is provided with a retraction means arrangement section in which the retraction means is detachably arranged at a rear facing position of the abutment section. A guard cable tensioning device according to any one of claims 1 and 2, characterized in that the device body is provided with a retraction means arrangement section in which the retraction means is detachably arranged at a rear facing position of the abutment section. The guard cable tensioning device according to claim 3, characterized in that the device body is provided with a retraction means arrangement section in which the retraction means is detachably arranged at a position facing the rear of the abutment section. 3. The guard cable tensioning device according to claim 1, wherein said device body is provided with a clamping and fixing portion for clamping and fixing said device body to said support. 4. A guard cable tensioning device according to claim 3, wherein said device body is provided with a clamping and fixing portion for clamping and fixing said device body to said support. 5. A guard cable tensioning device according to claim 4, wherein said device body is provided with a clamping and fixing portion for clamping and fixing said device body to said support. 6. A guard cable tensioning device according to claim 5, wherein said device body is provided with a clamping and fixing portion for clamping and fixing said device body to said support pole. A guard cable tensioning device according to claim 6, characterized in that the clamping and fixing part is configured by providing a pair of left and right clamping members at the front part of the abutting part so that they can be moved toward and away from each other. A guard cable tensioning device according to claim 7, characterized in that the clamping and fixing part is configured by providing a pair of left and right clamping members at the front part of the abutting part so that they can be moved toward and away from each other. A guard cable tensioning device according to claim 8, characterized in that the clamping and fixing part is configured by providing a pair of left and right clamping members at the front part of the abutting part so that they can be freely attached and detached. The guard cable tensioning device according to claim 9, characterized in that the clamping and fixing part is configured by providing a pair of left and right clamping members in a front portion of the abutting part so that they can be moved toward and away from each other.

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