JP2022172014A - Post replacement method and jig - Google Patents

Abstract

To efficiently replace posts in a wire rope type guard fence.SOLUTION: A post replacement method for a wire rope type guard fence supporting a plurality of vertically aligned wire ropes in a tensioned state with a plurality of posts includes: holding a plurality of wire ropes in a tensioned state with a holding part of a jig comprising the holding part for holding the plurality of wire ropes at prescribed intervals, and a receiving part for receiving an external force acting upward when the plurality of wire ropes are held by the holding part; applying the external force acting upward to the receiving part of the jig by a force applying device to move the plurality of wire ropes in a tensioned state upward; installing a new post having an open upper end and a groove through which the plurality of wire ropes pass with the plurality of wire ropes in a tensioned state being moved upward; and operating the force applying device to lower the jig and move the plurality of wire ropes in a tensioned state downward to enter the groove of the new post.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to a post replacement method and jig, and more specifically to a wire rope guard fence post replacement method and jig.

As one of the methods to prevent serious accidents caused by vehicles traveling on the roadway deviating from the lane, there is a method of installing a wire rope type guard fence at the boundary of the oncoming lane. Wire rope guard fences consist of multiple stages of wire ropes that are tensioned by devices such as turnbuckles, and supports that support the multiple stages of wire ropes.

When a vehicle collides with this type of protective fence and the struts are damaged or deformed, the work to replace the struts can generally be done by loosening the wire ropes. many. However, in such a post replacement work, it is necessary to release the tension of the wire rope and to tighten the wire rope after installing the new post, so the replacement work takes a long time. Become.

As a related technique, in Patent Document 1, a single post formed with a slit for passing a wire rope is connected to a lower post inserted into a sleeve buried in the ground and an upper part of the lower post. It describes a method of replacing a strut while tension is applied to a wire rope by dividing it into an upper strut.

Japanese Patent Application Laid-Open No. 2020-133160

In the method described in Patent Literature 1, the work of connecting the lower strut and the upper strut is performed in a state in which a tensioned wire rope is passed through the slit of the upper strut. Such work requires some lifting of the tensioned wire rope in order to pass the wire rope through the slit in the upper strut, increasing the workload of the operator. In addition, a worker is required to maintain the wire rope in a lifted state in addition to the worker who connects the lower strut and the upper strut, which increases manpower.

In one aspect, an object of the present invention is to efficiently replace posts in a wire rope guard fence.

A strut replacement method according to one aspect is to replace struts of a wire rope guard fence in which a plurality of vertically aligned wire ropes in a tense state are supported by a plurality of struts installed along the extending direction of the wire ropes. The method, wherein at least one of the plurality of struts has an open upper end side when installed and has a groove through which the plurality of wire ropes pass; The holding portion of the jig has a holding portion that holds the plurality of wire ropes at intervals, and a receiving portion that receives an external force acting upward when the plurality of wire ropes are held by the holding portion. applying an external force acting upward to the receiving portion of the jig by a force applying device to move the plurality of wire ropes in a tensioned state upward; With the wire rope moved upward, a new strut having the groove is installed, and the jig is lowered by operating the force adding device to move the plurality of wires in a tensioned state upward. moving a rope downward into the groove of the new post.

According to the above aspect, it is possible to efficiently replace the posts in the wire rope guard fence.

It is the schematic explaining the structural example of a wire-rope-type protective fence. It is a perspective view explaining an example of an appearance composition of a support. It is a figure explaining an example of the support method of a wire rope. It is a perspective view explaining an example of an appearance composition of a jig used by exchange work of a support concerning one embodiment. FIG. 5 is a diagram illustrating an example of a method for lifting a wire rope in a post replacement work according to one embodiment; It is a figure which shows an example of the protective fence in the state which lifted the wire rope using the jig. It is a figure explaining an example of the operation|work which installs a new support|pillar and returns a wire rope. It is a figure explaining an example of the method of engaging a jig with a support|pillar. It is a figure explaining an example of the exchange work of the support|pillar performed by making a jig engage with a support|pillar. It is a figure explaining the modification of a force applying apparatus which applies external force to a jig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in the following description, detailed description of the known configuration, function, etc. of the wire rope guard fence will be omitted. In addition, the dimensions of each component in the drawings to be referred to are given priority to make the characteristics of their shape and the relationship between the components easy to understand, and do not necessarily match the dimensions when implemented.

FIG. 1 is a schematic diagram illustrating a configuration example of a wire rope guard fence. FIG. 2 is a perspective view illustrating an example of the external configuration of a support. FIG. 3 is a diagram illustrating an example of a wire rope supporting method. In addition, FIG. 3 shows a half sectional view (upper side of the drawing) and a plan view (lower side of the drawing) of a part of the upper end side of one column.

The wire rope type protective fence (hereinafter also simply referred to as "protective fence") 1 illustrated in FIG. 5 stages of wire ropes 3 (3A, 3B, 3C, 3D and 3E) supported by 2; The wire ropes 3 in each of the first to fifth stages each include a plurality of wire ropes connected by turnbuckles 4, and the ends thereof are connected to anchor portions 5 embedded in the road surface 9. there is A plurality of columns 2 are installed, for example, at predetermined intervals along the boundary of the oncoming lane. The five-tiered wire ropes 3 are placed on the road surface 9 at predetermined intervals in the vertical direction, and in a state in which a predetermined tension is applied by the turnbuckles 4 and the anchor portions 5 (hereinafter also referred to as a "tensioned state"), the wire ropes 3 are stretched by the pillars 2. Supported. Note that the number of stages of the wire rope 3 is not limited to the five stages illustrated in FIG. 1, and may be another number of stages. Moreover, the protection fence 1 illustrated in FIG. 1 may be installed along the edge of the roadway in the width direction, for example, without being limited to the boundary of the oncoming lane.

The post 2 is, for example, a cylindrical metal member, as shown in FIG. 2, and is installed on the road surface 9 so that the axial direction is the vertical direction. The post 2 has a groove 201 with a bamboo-split structure extending along the axial direction with an open end that becomes the upper end when installed on the road surface 9, and the wire rope 3 of five stages passes through the groove 201. is installed as follows. The five stages of the wire ropes 3 passing through the grooves 201 are supported so that the interval P between the wire ropes 3 adjacent in the vertical direction is a predetermined interval (for example, an interval within the range of approximately 20 cm to approximately 30 cm). For example, as shown in FIG. 3, the wire ropes 3 adjacent to each other in the vertical direction are supported by the support pillar 2 while maintaining the gap G by spacers 6 attached to the support 2, thereby increasing the distance between the wire ropes 3. P is kept at a predetermined interval. The spacer 6 illustrated in FIG. 3 is movable along the extending direction of the groove 201 of the support 2 and engages with the support 2 so as to restrict the movement of the support 2 in the radial direction. not). When using such a spacer 6, when installing the protective fence 1, after alternately inserting the wire rope 3 and the spacer 6 before applying tension into the groove 201 of the support 2, the turnbuckle 4 etc. Tension is applied to the wire rope 3 by . Note that the shape of the groove 201 of the post 2 and the shape of the spacer 6 are not limited to the shapes illustrated in FIGS. 2 and 3, and may be other shapes. For example, the groove 201 of the strut 2 may have a shape having a locking portion that can be used for positioning the wire rope 3 along the extending direction of the groove 201 . For example, the spacers 6 may be mountable in the grooves 201 in a state in which the wire ropes 3 in multiple stages are passed through the grooves 201 of the struts 2 .

Further, the upper end of the post 2 installed on the road surface 9 is covered with a cap 7 for preventing the wire rope 3 from unintentionally coming out of the groove 201, as shown in FIG. .

The protection fence 1 described above with reference to FIGS. 1 to 3 is installed, for example, so that the wire ropes 3 of each stage extend along the boundary of the opposite lane on the roadway. This type of protection fence 1 can absorb the impact of the collision by breaking or deforming the struts 2 when the vehicle collides, and can prevent the accident from becoming serious. However, when the support 2 is damaged or deformed, it is necessary to replace the support 2 . In a conventional method commonly used as a replacement method for the struts 2 in the protective fence 1, the turnbuckle 4 is operated to release the tension of the wire rope 3, and the turnbuckle 4 is operated to return the wire rope 3 to the tension. work is required. In addition, in the method described in Patent Literature 1 described above, in the work for connecting the lower strut and the upper strut, the work load on the worker, such as lifting the wire rope 3 in a tense state, increases.

FIG. 4 is a perspective view for explaining an example of an external configuration of a jig used in a post replacement work according to one embodiment. FIG. 5 is a diagram illustrating an example of a method of lifting a wire rope in a post replacement work according to one embodiment.

A jig 8 such as that illustrated in FIG. 4 is used in the replacement work of the pillars 2 of the protective fence 1 according to the present embodiment. In the jig 8 illustrated in FIG. 4, a plurality of entrance grooves 801 are provided along the axial direction on the side surface of a metal rectangular tube. Each of the plurality of entry grooves 801 extends from one side surface of the square pipe in a direction perpendicular to the axial direction, and is formed so that one wire rope 3 can move along the extending direction. In addition, at the deepest part of each of the entry grooves 801, for example, a locking part that is extended in the axial direction is provided in order to prevent the wire rope 3, which has entered the deepest part, from withdrawing.

The innermost portions of the plurality of entrance grooves 801 are shaped such that the interval P0 between the wire ropes 3 is the same as or substantially the same as the interval P between the wire ropes 3 in the protective fence 1 . In other words, the shape of the innermost portion of the plurality of entry grooves 801 is designed, for example, such that the gap G0 between adjacent wire ropes 3 in the plurality of stages of wire ropes 3 is greater than or equal to a predetermined value. More specifically, the shape of the innermost portion of the plurality of entrance grooves 801 may be formed, for example, to have a larger value (eg, 10 cm or more) than the thickness of a typical human arm. Note that the shape of the innermost portion of the plurality of entrance grooves 801 is not limited to the shape described above, and can be changed as appropriate. The shape of the innermost portion of the plurality of approach grooves 801 is, for example, a shape in which the gap between the wire ropes 3 changes stepwise (for example, when n is a natural number, the wire rope 3 at the nth stage and the wire rope 3 at the n+1th stage) The shape may be such that the gap with the wire rope 3 is smaller than the gap between the wire rope 3 at the n+1 stage and the wire rope 3 at the n+2 stage. A plurality of entry grooves 801 in the jig 8 illustrated in FIG. 4 is an example of a holding portion that holds a plurality of wire ropes 3 at predetermined intervals.

Further, the jig 8 illustrated in FIG. 4 is provided with openings 810 and 811 at one end in the axial direction as receiving portions for receiving an external force in the axial direction from the force applying device. The openings 810 and 811 are dimensioned to allow the arm portion 1101 of the jack 11 illustrated in FIG. 5 to pass through, for example. A jack 11 illustrated in FIG. 5 is an example of a force applying device that applies an external force to the receiving portion of the jig 8 . The jack 11 as a force application device is not limited to the shape illustrated in FIG. 5, and may be of another shape.

Of the two jigs 8 illustrated in FIG. 5, the jig 8 on the left illustrates, for example, the position with respect to the road surface 9 immediately after starting the work of lifting the wire ropes 3 in multiple stages, and the jig 8 on the right: The position with respect to the road surface 9 is illustrated when the work of lifting the wire ropes 3 in multiple stages and installing a new support is performed. The dashed horizontal line in FIG. 5 indicates the position of the height H from the road surface 9, and indicates an example of the position of the upper end of the column newly installed on the road surface 9. As shown in FIG.

The multi-stage wire ropes 3 in the protective fence 1 according to this embodiment pass through the grooves 201 of the posts 2 installed on the road surface 9, as described above with reference to FIGS. The height of 3 from the road surface 9 is lower than the height H of the post 2 installed on the road surface 9. - 特許庁In such a state that the height of each wire rope 3 from the road surface 9 is lower than the height H of the support 2 installed on the road surface 9, the new support 2 is installed so that each wire rope 3 passes through the groove 201 of the support 2. is difficult to install. For this reason, in the replacement work of the strut 2 according to the present embodiment, as illustrated in FIG. The jig 8 is lifted (pushed up) by a device (for example, a jack 11). The jack 11 illustrated in FIG. 5 is an example of a manual high-lift jack. For example, arm portion 1101 is jacked up (stage increase). The arm 1101 of the jack 11 is jacked down (stepped down) by, for example, moving a lever (not shown) to the second position and operating the handle 1102 .

When lifting the jig 8 with the jack 11, for example, as shown in FIG. lift to. In this way, by pushing up the jig 8 with the jack 11, the tensioned wire rope 3 can be moved to a height at which a new support 2 can be installed with less force than when the wire rope 3 is directly lifted manually. can be made In addition, since the height of the wire rope 3 in a tensioned state from the road surface 9 can be maintained by the jack 11, another worker can lift the wire rope 3 while the work of installing a new support 2 is being performed. no need to hold on.

FIG. 6 is a diagram showing an example of a protective fence in which a wire rope is lifted using a jig. FIG. 7 is a diagram illustrating an example of the work of installing a new support and returning the wire rope. 6 and 7 omit illustration of the jack 11 as a force applying device.

In the replacement work of the support 2 according to the present embodiment, for example, as shown in FIG. 8 is attached, and the jig 8 is lifted (pushed up) by a force applying device (jack 11). As described above, the jig 8 pushes up until the height of the lowermost wire rope 3 from the road surface 9 at the position where the new support 2 is to be installed becomes higher than the height of the support 2 . At this time, the portion of each wire rope 3 that passes through the groove 201 of the existing support 2 adjacent to the newly installed support 2 is pushed upward and exits the groove 201 . The work of removing the damaged or deformed post installed on the sleeve 901 for installing the new post 2 may be performed before the work of lifting the wire rope 3 or after the work of lifting the wire rope 3. You can go with Whether to lift the wire rope 3 before or after the work is determined according to the degree of damage or deformation of the pillar 2, for example.

After the wire rope 3 is lifted by the force applying device, a new strut 2 is inserted into the sleeve 901 of the road surface 9 while the wire rope 3 is lifted, as illustrated in FIG. 7(a). After that, the jig 8 is lowered by operating the force adding device, and each of the multiple stages of the wire ropes 3 is caused to enter the groove 201 of the support 2, as illustrated in FIG. 7(b). After returning the height of the wire ropes 3 from the road surface 9 to the height before the work, the jig 8 is removed from the wire ropes 3, and the work of passing the wire ropes 3 through the grooves 201 of the struts 2 is finished. do. When the manual high-lift jack described above is used as the force applying device, after inserting the new strut 2 into the sleeve 901, the lever for switching the moving direction of the arm is set to the second position, the handle is operated, and the jig 8 The arms inserted through the openings 810 and 811 of the can be lowered step by step. Therefore, the arm of the jack can be lowered while aligning the tensioned wire rope 3 with the groove 201 of the support 2 to allow the wire rope 3 to enter the groove 201 of the support 2 . Therefore, compared with the case where the worker manually performs the work of re-entering the groove 201 of the tensioned wire rope 3 which has been lifted out of the groove 201 of the post 2, the work efficiency is high and the work load of the worker is reduced. Growth is suppressed.

As described above, in the replacement work of the struts 2 according to the present embodiment, the plurality of stages of the wire ropes 3 are lifted (pushed up) with a predetermined interval maintained using a force applying device, and the state is maintained. Then, a new support 2 is installed on the road surface 9. Since the state in which the wire rope 3 is lifted is maintained by the force applying device, the work load of the worker does not increase. In addition, since the worker does not have to hold the wire rope 3 in a strained state, the work of installing the new support 2 can be carried out safely and efficiently.

6 and 7, the wire rope 3 is lifted using one jig 8 in the vicinity of the position where the new post 2 is to be installed. can be changed as appropriate. For example, two jigs 8 are attached to the wire rope 3 at a predetermined interval, and each of the two jigs 8 is individually lifted by a force applying device (e.g., jack 11), so that each force applying device can move through the jig 8. Therefore, it is possible to reduce the repulsive force received from the wire rope 3 in a tensioned state, thereby preventing damage to the force applying device. In addition, by individually lifting each of the two or more jigs 8 with a force applying device (for example, a jack 11), the length of the lifted section of the wire rope 3 can be increased. It is possible to efficiently perform replacement work when replacement is required.

In addition, when a plurality of jigs 8 are used in the replacement work of the column 2, one or more jigs 8 among the plurality of jigs 8 are arranged so that the existing column 2, which is not to be replaced, can be moved in the vertical direction. It may be engaged with the strut 2 . For example, in the square tubular jig 8 described above with reference to FIG. Openings 810 and 811 are formed. 4, the jig 8 is engaged with the post 2 on two surfaces facing each other in the extending direction of the wire rope 3 on the end side where the openings 810 and 811 are formed. Openings 815 and 816 are formed for use in mating.

FIG. 8 is a diagram illustrating an example of a method of engaging a jig with a support. FIG. 9 is a diagram for explaining an example of post replacement work performed by engaging a jig with a post. In addition, in FIG. 9, illustration of the jack 11 as a force applying device is omitted.

When the jig 8 is engaged with the existing support 2, for example, as shown in FIG. . The method of attaching the plate 12 to the column 2 may be any method that prevents the plate 12 from slipping in the axial direction of the column 2 due to the external force that the projecting portion 1201 receives from the jig 8 when the jig 8 is lifted. , not limited to any particular method. Also, the overhanging portion 1201 and the openings 815 and 816 of the plate 12 are arranged such that when the overhanging portion 1201 is inserted through the openings 815 and 816, the arm portion 1101 and the overhanging portions 1201 of the jack 11 that are inserted through the openings 810 and 811 are arranged to be aligned. It suffices if it does not interfere with

When the jig 8 is engaged with the post 2, the spacer 6 interposed between the wire ropes 3 is fastened to the post 2 using the fastener 13, as illustrated in FIG. In this way, when the projecting portion 1201 of the plate 12 attached to the support 2 is inserted into the openings 815 and 816 of the jig 8 and the spacer 6 between the wire ropes 3 is fastened to the support 2, the jig 8 is moved by the force applying device. is lifted, the plate 12 attached to the support 2 receives an upward force from the lower ends of the openings 815 and 816 of the jig 8, and the spacer 6 fastened to the support 2 receives an upward force from the wire rope 3. receive. Therefore, as illustrated in FIG. 9, by lifting the jig 8, the existing support 2 is lifted together with the wire rope 3. As shown in FIG.

When the existing struts 2 are lifted together with the wire ropes 3, the new struts 2 are installed in a state in which the wire ropes 3 in multiple stages pass through the grooves 201 of the struts 2 and a predetermined gap G is maintained by the spacers 6. be able to. For this reason, after installing a new post 2, the wire rope 3 is lowered and the lifted existing post 2 is inserted into the sleeve 901 of the road surface 9, whereby the wire rope 3 and the post 2 return to the state before being lifted. . Therefore, in the replacement work of the strut 2 described above with reference to FIGS. Alignment for re-intruding into the wire rope 3, adjustment of the gap of the wire rope 3 by the spacer 6, etc.) can be omitted. Therefore, compared to the case where the wire rope 3 lifted up as described above with reference to FIGS. This can be done more efficiently.

It should be noted that the force applying device used in the replacement work of the column 2 according to the present embodiment is not limited to a device for pushing up the jig 8 such as the jack 11 described above. It may be a lifting device. FIG. 10 is a diagram illustrating a modification of the force adding device that applies an external force to the jig.

When the jig 8 is pulled up by the crane 14 or the like, for example, when attaching the jig 8 to the wire rope 3, the direction shown in FIG. 4 is reversed upside down. At this time, the openings 810 and 811 as receiving portions for receiving the external force from the force adding device are positioned above the wire rope 3 . Therefore, for example, by hooking belts, wires, hooks, or the like to the openings 810 and 811 and suspending the jig 8 with the crane 14 , an upward external force can be applied to the jig 8 to lift the jig 8 .

As described above, in the method for replacing the struts 2 of the wire rope type protective fence 1 according to the present embodiment, the holding portion (approach groove 801) that holds a plurality of wire ropes 3 at predetermined intervals and the holding portion The plurality of wire ropes 3 in a tensioned state is held by the holding portion 801 of the jig 8 having receiving portions (openings 810 and 811) that receive an external force acting upward when the plurality of wire ropes 3 are held. The wire ropes 3 are held, and an external force acting upward is applied to the receiving portions 810 and 811 of the jig 8 by the force applying device, thereby moving the plurality of wire ropes 3 in a tensioned state upward. Then, in a state in which the plurality of wire ropes 3 in a tensioned state are moved upward, after installing a new support 2 having a groove 201 with an open upper end, the jig 8 is lowered by operating the force applying device, A plurality of wire ropes 3 in a tensioned state are made to enter the grooves 201 of the strut 2. - 特許庁That is, in the method of replacing the struts 2 of the wire rope type protective fence 1 according to the present embodiment, the damaged or deformed struts are replaced while a predetermined tension is applied to the plurality of wire ropes 3 (tensioned state). A new support 2 can be installed on the road surface 9. Therefore, for example, in order to allow the wire rope 3 to enter the groove 201 of the new post 2, the turnbuckle 4 is loosened to lower the tension of the wire rope 3, or the turnbuckle 4 is tightened after that to tighten the wire rope 3 to a predetermined level. Work to apply tension can be omitted. Therefore, in the method for replacing the support 2 according to this embodiment, it is possible to shorten the time required for the work for installing the new support 2 on the road surface 9 .

In addition, since a new strut 2 can be installed in a state in which a plurality of wire ropes 3 are lifted using a force applying device, the wire rope 3 in a tense state can be removed when installing a new strut 2. There is no need for workers to carry out the work of lifting and supporting, and it is possible to suppress an increase in the number of workers required for the work and an increase in the work load of the workers. In addition, since the wire ropes 3 are lifted so as to maintain a predetermined distance by using a force applying device such as a jack 11 or a crane 14, the repulsion of the lifted wire ropes 3 may cause damage to a part of the worker's body or the work. Clothes can be prevented from being pinched by the wire rope 3, and the replacement work of the support 2 can be performed safely and efficiently.

The above-described embodiments are specific examples for easy understanding of the invention, and the present invention is not limited to the above-described embodiments. Various modifications and alterations can be made to the method of replacing the struts 2 of the wire rope guard fence 1 and the jig 8 used to replace the struts 2 according to the present invention without departing from the scope of the claims. .

For example, the jig 8 used for lifting the wire ropes 3 in multiple stages is not limited to the shape as described above with reference to FIG. Any shape that can be held in such a manner is acceptable. Moreover, the jig 8 only needs to be able to hold the wire ropes 3 in multiple stages so that the predetermined gap G0 is maintained at least when lifted by the force applying device. Therefore, the jig 8 is not limited to the metal tube as described above, but may be a pillar-shaped one, a metal chain-shaped one, a resin product, a combination of metal and resin, a leather product, or the like.

Also, the jig 8 used for lifting the wire ropes 3 in multiple stages may have more entry grooves 801 as holding portions for holding the wire ropes 3 than the number of the wire ropes 3 to be lifted. Further, when a plurality of entry grooves 801 are provided in the jig 8, the innermost shape of each entry groove 801 may be the same, or may be two or more.

Further, the method of lifting the existing support 2 together with the jig 8 is not limited to the method of attaching the plate 12 to the existing support 2 and engaging with the jig 8 as described above with reference to FIG. may be directly attached (fixed) to the strut 2 of the

1 Protective fence 2, 2A, 2B, 2C, 2D Post 201 Groove of split bamboo structure 3, 3A, 3B, 3C, 3D, 3E Wire rope 4 Turnbuckle 5 Anchor part 6 Spacer 7 Cap 8 Jig 801 Approach groove 810, 811 Opening 815, 816 Opening 9 Road surface 901 Sleeve 11 Jack 1101 Arm 12 Plate 1201 Overhang 13 Fastener 14 Crane

Claims (6)

A method for replacing posts of a wire rope guard fence in which a plurality of vertically aligned wire ropes in a tensioned state are supported by a plurality of posts installed along the extending direction of the wire ropes, the method comprising:
At least one of the plurality of struts has an open upper end side when installed and has a groove through which the plurality of wire ropes pass,
The exchange method is
The holding portion of a jig having a holding portion that holds a plurality of wire ropes at predetermined intervals, and a receiving portion that receives an external force acting upward when the plurality of wire ropes are held by the holding portion. holding the plurality of wire ropes in tension by
applying an external force acting upward to the receiving portion of the jig by a force applying device to move the plurality of wire ropes in a tensioned state upward;
installing a new strut having the groove while moving the plurality of wire ropes in a tensioned state upward;
operating the force applying device to lower the jig and move the plurality of wire ropes in a tensioned state that have been moved upward downward to enter the groove of the new support;
A method for replacing a post of a wire rope protective fence, comprising: holding the plurality of wire ropes in tension by the holding portion of the jig includes holding the plurality of wire ropes in tension by each of two or more jigs;
moving the plurality of wire ropes in a tensioned state upward is performed by applying an external force acting in the upward direction to each of the two or more jigs by one or more of the force applying devices;
The method for exchanging a post of a wire rope guard fence according to claim 1, characterized in that: By holding the plurality of wire ropes in a tensioned state by the holding portion of the jig, the plurality of wire ropes are attached to the pillars already installed so that they can move in the vertical direction according to the change in the vertical position of the jig. engaging the fixture;
upwardly moving the plurality of wire ropes in tension,
moving up the strut engaged with the jig with the plurality of wire ropes;
3. The method for replacing a post of a wire rope guard fence according to claim 1 or 2, characterized in that: 4. The method for replacing posts of a wire rope protective fence according to any one of claims 1 to 3, wherein a jack is used as the force applying device. The jig is a cylindrical or columnar metal member, the holding portion is provided so as to hold the plurality of wire ropes side by side along the axial direction of the metal member, and the receiving portion is , provided on one end side of the metal member in the axial direction,
The method for replacing a post of a wire rope type protective fence according to any one of claims 1 to 4, characterized in that: a holding unit that holds a plurality of wire ropes in a tensioned state aligned in the vertical direction at predetermined intervals;
a receiving portion that receives an external force acting upward when the plurality of wire ropes are held by the holding portion;
A jig characterized by having

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