Structure of support for guard fence and assembling method of support for guard fence

Abstract

To effectively prevent a sudden load drop in a connection part of a support by distributing the a load acting on the connection part of the support.SOLUTION: A structure of a support for a guard fence is provided with a lower support 20a and an upper support 20b, which together form a support divided into upper and lower parts, and a connection socket 20c, where, a split position P1 of a steel pipe 21 constituting the lower support 20a and the steel pipe 21 constituting the upper support 20b and a split position P2 of a reinforcing bar 22 buried in the lower support 20a and the reinforcing bar 22 buried in the upper support 20b are in positions mutually shifted along the longitudinal direction of the support, and the connection socket 20c has the whole length capable of covering the split position of the steel pipe 21 and the split position of the reinforcing bar 22.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a post for a safety fence that captures falling objects such as falling rocks, earth and sand, avalanches, and accumulated snow, and in particular to a structure of a post for a safety fence that is constructed in a divided manner. [Background technology]

[0002] Generally, a safety fence comprises a number of posts and a safety net attached between adjacent posts, and is structured so that the impact force acting on the safety net is ultimately supported by the posts. In conventional safety fences, the strength of the posts is designed according to the energy absorption capacity.

[0003] On the other hand, because the posts are relatively long and heavy, in sites where vehicle transport is difficult or where the site where the protective fence is to be installed is narrow, transporting the posts to the site and installing them on site becomes extremely difficult.

[0004] At such a site, the split pillars 51 are transported to the site in a form divided into pieces of an appropriate length, and are then assembled into a single pillar 50 on site. As a means of connecting the divided pillars, a known method is to protrude annular flanges 52 from the joint end faces of the divided pillars 51, as shown in Figure 9, and then assemble the pillars 50 by connecting the butted flanges 52, 52 together on site with a number of connecting bolts 53.

[0005] Furthermore, Patent Document 1 discloses a pillar connecting structure in which a concrete-filled steel pipe pillar is divided into two halves, an upper part and an lower part, a steel pipe receiving tube is fitted across the joint between the lower part and the upper part of the divided pillar, and the lower end of the receiving tube is welded to the outer surface of the pillar to form an integrated structure. In this pillar connecting structure, reinforcement is provided by engaging a steel bar protrusion provided along the axial direction on the outer peripheral surface of each divided pillar with a steel bar protrusion provided along the axial direction on the inner peripheral surface of the receiving tube, and mortar is filled into the gap between the peripheral surfaces of the receiving tube and the pillar to secure them together. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2017-203292 A Summary of the Invention [Problem to be solved by the invention]

[0007] Conventional flange joints for connecting columns have the following problems: <1> If flanges 52 are formed on the end faces of the split struts 51, the manufacturing costs of the struts 50 will increase. <2> After assembly, the support pillar 50 has an annular flange 52 formed protruding radially from the outer circumferential surface of the support pillar 50 . Therefore, if there is a difference in height between adjacent posts 50, there is a risk that the protective loops 31 that constitute the protective net will interfere with the flanges 52. <3> Since the flange 52 protrudes from the connecting portion of the support 50, the wire mesh net material (not shown) partially bulges when the protective net is attached. This not only spoils the appearance, but also makes it difficult to connect the net material to the protective loop 31 using the connecting coil. <4> Not only do split pillars have stress concentrated at the joints of the pillars, making them weak points in terms of strength, but because they are made of hollow steel pipes, the strength of their joints is weaker than that of concrete-filled steel pipes, which have concrete filled inside the steel pipes or have rebar placed inside them.

[0008] The cylindrical support column connecting means disclosed in Patent Document 1 has the following problems. <1> Simply providing external reinforcement to the connection between the lower and upper parts of the pillar with a receiving tube does not provide enough strength, so additional reinforcement must be provided by placing multiple protrusions between the peripheral surfaces of the pillar and the receiving tube. <2> The task of welding and attaching a plurality of protrusions at precise positions to the outer peripheral surface of the support and the inner peripheral surface of the receiving tube is tedious, and the cost of connecting the support is high.

[0009] The present invention has been made in consideration of the above points, and its object is to provide a structure for a guardrail post that can distribute the load acting on the connection part of the post and effectively prevent a sudden drop in load at the connection part of the post. [Means for solving the problem]

[0010] The present invention relates to a structure for a protective fence post in which multiple reinforcing bars are arranged inside a steel pipe and filled with a solidifying material, the post being composed of a lower post divided into upper and lower parts, an upper post, and a connecting socket, the dividing position of the steel pipe constituting the lower post and the steel pipe constituting the upper post and the dividing position of the reinforcing bars embedded in the lower post and the reinforcing bars embedded in the upper post are offset in the longitudinal direction of the post, and the connecting socket covers the dividing position of the steel pipe and the dividing position of the reinforcing bars. The connecting socket has an overall length capable of covering the division positions of the steel pipes and the reinforcing bars, and the division positions of the reinforcing bars of the lower column and the upper column are covered by the cooperation of the solidifying material and the steel pipe, and the division positions of the steel pipes of the lower column and the upper column are covered by the connecting socket. In another form of the present invention, a reinforcing bar is protruded downward from the lower part of the upper support, and an upward connecting space is formed at the upper part of the lower support, and the reinforcing bar is accommodated in the connecting space of the lower support and connected to the lower part of the upper support. In another embodiment of the present invention, an auxiliary reinforcing bar may be embedded across the space between the upper part of the lower support and the lower part of the upper support. In another form of the present invention, an upward connecting space is formed at the upper part of the lower support, and a connecting binder is filled in the connecting space to integrally connect the binder of the lower support and the binder of the upper support. In another embodiment of the present invention, the lower end of the connecting socket is fixed to the outer circumferential surface of the lower support by welding. In another embodiment of the present invention, among the lower support, the upper support or the connecting socket, at least the upper support has an outer peripheral surface provided with multiple mooring portions for positioning the rope material. The present invention further relates to a method for assembling a post for a protective fence in which a plurality of reinforcing bars are arranged inside a steel pipe and filled with a cementing material, the post being composed of a lower post divided into an upper and lower part, an upper post, and a connecting socket fixed to the outer circumferential surface of the lower post by welding, reinforcing bars are provided at the bottom of the upper post so as to protrude downward, and an upward connecting space is formed at the top of the lower post, the lower post is erected first, and then the bottom of the upper post is inserted into the connecting space of the lower post fitted with the connecting socket. The upper support has a connecting space for connecting reinforcement bars at the bottom thereof, and a connecting material is filled into the connecting space to integrally connect the lower support and the upper support. The dividing positions of the steel pipe constituting the lower support and the steel pipe constituting the upper support are offset from the dividing positions of the reinforcing bars embedded in the lower support and the reinforcing bars embedded in the upper support in the longitudinal direction of the support, and the connecting socket covers the dividing positions of the steel pipe and the reinforcing bars. Effect of the Invention

[0011] The present invention has at least one of the following effects. <1> The present invention does not reinforce the connecting portion only with a connecting socket, but by arranging the dividing positions of the steel pipe constituting the lower support and the steel pipe constituting the upper support, and the dividing positions of the reinforcing bars embedded in the lower support and the reinforcing bars embedded in the upper support in offset positions along the longitudinal direction of the support, it is possible to disperse weak parts and effectively prevent a sudden drop in the overall load. <2> When an impact is received, the bending force acting on the split points of the steel pipe can be distributed and supported through the connecting socket, and the bending force acting on the split points of the reinforcing bar can be distributed and supported through the surrounding reinforcement material and steel pipe. <3> By installing additional reinforcement bars inside the columns, the connection strength between the lower and upper columns can be increased and the fragility can be further improved. <4> Since there are no protrusions like those in conventional flange joints at the connection points of the posts, the protective loops that make up the protective net can be installed without any problems even if there is a difference in height between adjacent posts. <5> Since there are no protrusions at the connecting portions of the posts, it is possible to provide the connecting portions of the posts not only at locations above ground, but also at locations buried underground. <6> Since there are no protrusions such as flanges, the posts can be manufactured more economically than conventional posts that have flange joints integrally formed at the ends, and the wire net material can be prevented from expanding when it comes into contact with the flanges. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is an explanatory diagram of a protective fence equipped with posts according to a first embodiment. [Diagram 2] An enlarged perspective view of the posts and protective net that make up the protective fence [Diagram 3] Plan view of the safety net [Figure 4] An explanatory diagram of the lower and upper supports before they are connected, with some parts omitted. [Diagram 5] An explanatory diagram of the lower support and upper support when connected, with some parts omitted [Figure 6] A longitudinal cross-sectional view of the joint of the support pillars with some parts omitted. [Figure 7] An explanatory diagram of Example 2 in which the connecting portion of the support is buried underground. [Figure 8] FIG. 3 is an explanatory diagram of Example 3 in which an auxiliary reinforcement bar was additionally installed; (A) is an explanatory diagram of the connection between the lower support and the upper support, and (B) is a vertical cross-sectional view of the connection part of the support. [Figure 9] An explanatory diagram of the connection structure of pillars using flange joints. (A) is a perspective view of the flange joint of the pillars, and (B) is an explanatory diagram of a protective fence when there is a height difference between adjacent pillars. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present invention will now be described in detail with reference to the drawings. EXAMPLES

[0014] <1> Overview of the protective fence The protective fence 10 shown in FIG. 1 will be described. The protective fence 10 comprises a plurality of posts 20 erected at a predetermined interval and a protective net 30 stretched between adjacent posts 20. Furthermore, the protective fence of this example is equipped with a top spacer 40 that is horizontally disposed between the heads of adjacent posts 20, and a spacing retainer 34 that regulates the displacement of the protective loop 31 in the height direction.

[0015] The top spacer 40 is a rigid material for maintaining the head space between adjacent columns 20 .

[0016] The spacing member 34 is, for example, a chain formed by linking together single wheels, and the protective loop 31 is positioned by inserting it through a single wheel of the chain attached to the top spacer 40 or the uppermost protective loop 31. Incidentally, the top spacer 40 is not essential and may be omitted in some cases.

[0017] <2> pillar The pillar 20 is based on a pillar structure made of a filled steel pipe in which a plurality of reinforcing bars 22 are arranged inside a steel pipe 21 and a solidifying material 23 such as concrete is filled inside the steel pipe 21.

[0018] In this example, a form is described in which the support pillar 20 is divided into two parts, upper and lower, a lower support pillar 20a, an upper support pillar 20b, and a connecting socket 20c that can be externally mounted across the connecting portion of both supports 20a, 20b; however, the number of divisions of the support pillar 20 may be two or more.

[0019] <2.1> Mooring part of the support On the outer surface of the support 20 (lower support 20a, upper support 20b, connecting socket 20c), mooring sections 25 for positioning, such as U-shaped hooks, are provided in multiple stages along the length, and a rope is passed through each mooring section 25 to prevent the protective loop 31 from slipping off.

[0020] <2.2> Lower support The following description will be given with reference to Figure 4. The lower support 20a is equipped with a plurality of reinforcing bars 22 arranged inside the steel pipe 21, and a solidifying material 23 such as concrete that is filled inside the steel pipe 21, and forms an upward connecting space S at the top of the steel pipe 21 with a bottomed structure. The reinforcing bars 22 and the solidifying material 23 are set back downward relative to the steel pipe 21 of the lower support 20a to form a connecting space S within the steel pipe 21 in order to firmly connect the lower support 20a and the upper support 20b by utilizing the connecting space S.

[0021] <2.2.1> Positional relationship between the steel pipe of the lower support, the cemented carbide, and the upper part of the reinforcing bar Explaining with reference to FIG. 4, at the bottom of the connection space S, the upper end faces of the consolidated material 23 and the upper end faces of the reinforcing bars 22 are exposed. At this time, the upper portion of the reinforcing bar 22 located in the connection space S is made to protrude slightly upward from the upper end surface of the consolidated material 23.

[0022] In other words, the distance L1 from the upper end of the steel pipe 21 constituting the lower support 20a to the upper end surface of the consolidated material 23 formed at the bottom of the connecting space S is set to be greater than the distance L2 from the upper end of the steel pipe 21 to the upper end surface of the reinforcing bar 22 (L1>L2).

[0023] <2.3> Linked socket The connection socket 20c will be described with reference to Fig. 4. The connection socket 20c is a steel pipe cylinder with both ends open for exterior mounting on the joint between the two divided pillars 20a, 20b to reinforce the joint. The inner diameter of the connecting socket 20c is slightly larger than the outer diameter of both the divided supports 20a, 20b, so that when the connecting socket 20c is fitted onto both the supports 20a, 20b, both the cylindrical bodies can come into contact with each other. The connecting socket 20c is fitted onto the upper part of the lower support 20a, and the lower end of the connecting socket 20c is fixed to the steel pipe 21 by welding or the like.

[0024] <2.3.1> Total length of connecting socket The overall length L3 of the connecting socket 20c is sufficient to cover the connecting portion between the lower support 20a and the upper support 20b. In other words, the overall length L3 of the connecting socket 20c only needs to have a dimension that can accommodate the connecting positions between the steel pipes 21 and the connecting positions between the reinforcing bars 22 when the lower support 20a and the upper support 20b are butted together.

[0025] In other words, the total length L3 of the connecting socket 20c is the distance L1 from the upper end of the steel pipe 21 that constitutes the lower support 20a to the upper end surface of the consolidated material 23 plus the overlapping areas L4 and L5 between the lower support 20a and the upper support 20b. The overlap lengths L4 and L5 can be selected individually and appropriately.

[0026] <2.4> Upper support An explanation will be given with reference to Fig. 4. The upper support column 20b comprises a plurality of reinforcing bars 22 arranged inside the steel pipe 21, and a solidifying material 23 such as concrete filled inside the steel pipe 21. In the drawing, the lower part of the upper support 20b is shown formed on the same plane as the lower surface of the consolidated material 23 and the lower end surface of the steel pipe 21, but the lower surface of the consolidated material 23 may be formed to protrude downward beyond the lower end surface of the steel pipe 21. If the lower surface of the binder 23 is formed to protrude downward beyond the lower end surface of the steel pipe 21, the amount of binder 23a for connection filled in the connection space S of the lower support 20a can be reduced, as described below. Reinforcing bars 22 protrude downward from the lower surface of upper column 20b.

[0027] <2.4.1> Projection length of reinforcing bars The protruding length L6 of the reinforcing bar 22 embedded in the upper support 20b is approximately equal to the distance L2 from the upper end of the steel pipe 21 constituting the lower support 20a described above to the upper end face of the reinforcing bar 22.

[0028] <2.5> Relationship between the contact position of the steel pipe and the contact position of the reinforcing bar In the present invention, when the lower support 20a and the upper support 20b are butted together within the connecting socket 20c, the end faces of the upper and lower steel pipes 21, 21 abut against each other, and the end faces of the upper and lower reinforcing bars 22, 22 abut against each other, but the division position (butt position) P1 between the steel pipes 21, 21 and the division position (butt position) P2 between the reinforcing bars 22 are offset in the axial direction so as not to be aligned at the same position. The reason why the dividing position P1 of the steel pipe 21 and the dividing position P2 of the reinforcing bar 22 are shifted in the axial direction is to distribute the load on the joint of the pillar 20 and improve the brittleness of the pillar 20. The strength factors of the joint of the pillar 20 will be explained later.

[0029] <3> Safety net As shown in Figures 1 and 3, the protective net 30 comprises a plurality of protective loops 31 with a cushioning function, in which a rope material of a length that can be wrapped around adjacent posts 20 is held near the end by a cushioning device 32, and a net material 33 attached to one side of the plurality of protective loops 31 which are wound in multiple stages and horizontally suspended between adjacent posts 20.

[0030] <3.1>Protection loop The protective loop 31 is made of rope material with excellent tensile strength, such as PC steel wire or PC twisted steel wire, and is formed into a loop by holding the overlapping parts near both ends of the rope material with buffer devices 32, and also forming excess lengths in the range beyond the holding positions of the buffer devices 32. The sliding distance of the protection loop 31 is determined by the set length of the extra length. As a means for connecting the rope end of the protection loop 1, instead of the shock absorbing device 32, a connecting fixture such as a turnbuckle can also be used.

[0031] The protection loops 31 are wound around the left and right protection loops 31, 31 in a chain manner so that the support poles 20 are shared by the loops. The vertical spacing of the protective loops 31 is appropriately selected and determined so as to prevent the penetration of falling rocks, avalanches, and the like.

[0032] <3.2>Buffer The shock absorber 32 is a device that grips the overlapping portion of the protective loop 31 and allows the rope material to slide when the tensile force acting on the protective loop 31 exceeds the frictional resistance force of the gripping portion, thereby attenuating the impact force. As the shock absorber 32, for example, a friction resistance type shock absorber can be used, but other known devices or apparatuses having a shock absorbing effect can also be used.

[0033] <3.3> Net material The net material 33 is a diamond-shaped wire mesh, and is connected to one side of the protection loop 31 by a known coil material.

[0034] [How to set up the support posts] A method for erecting the support pillars 20 will be described with reference to FIGS.

[0035] <1> Delivery of support materials in separate shipments As shown in FIG. 4, the components of the support 20, that is, the lower support 20a, the upper support 20b, and the connecting socket 20c, are carried into the erection site. The lower support 20a and the connecting socket 20c may be preferably welded together in advance at a factory or the like before being delivered to the site. Even if the complete support 20 has a long overall length and is heavy, the support 20 can be easily transported because it is disassembled into a shape that is easy to transport.

[0036] <2> Installation of the lower support As shown in FIG. 4, the lower portion of the lower support 20a is carried to the intended erection position of the support 20 and is then buried in a concrete foundation or the on-site ground to erect the support 20. The connecting socket 20c is fitted onto the upper part of the lower support 20a and is fixed in advance to the steel pipe 21 by welding or the like.

[0037] <3> Filling of binder FIG. 5 shows the upper part of the lower support 20a, and the connecting space S formed in the upper part of the lower support 20a is filled with an unhardened connecting material 23a.

[0038] <4> Installation of the upper support Next, the lower part of the upper support column 20b is inserted into the upper part of the lower support column 20a. That is, the reinforcing bar 22 protruding downward from below the upper support 20b and the steel pipe 21 of the upper support 20b are inserted into a connection space S formed at the top of the lower support 20a filled with a connecting solidification material 23a.

[0039] FIG. 6 shows the state in which the lower part of the upper support pillar 20b is connected to the upper part of the lower support pillar 20a. By butting the lower support 20a and the upper support 20b together, the end faces of the upper and lower steel pipes 21, 21 abut against each other, and the end faces of the upper and lower reinforcing bars 22, 22 also abut against each other.

[0040] By inserting the lower part of the upper pillar 20b into the connecting space S of the lower pillar 20a, the connecting consolidation material 23a in the connecting space S overflows to the outside, and as the consolidation material 23a in the connecting space S hardens, continuity is provided between the consolidation materials 23, 23 between the upper and lower pillars 20a, 20b.

[0041] As described above, even if the completed support pillar 20 has a long overall length, the lower support pillar 20a and the upper support pillar 20b, which are divided into shorter dimensions, are erected separately, so that assembly work of the support pillar 20 on site can be easily performed.

[0042] [Strength factors at the joints of supports] <1> Regarding the division position of steel pipe and reinforcing bar at the connection part As described above, the division position P1 of the steel pipes 21, 21 in the joint of the pillar 20 and the division position P2 of the reinforcing bars 22, 22 each become weak points (weak parts) in terms of strength. In the present invention, the division position P1 and the division position P2 are shifted in the axial direction of the support 20 so that they do not overlap at the same position.

[0043] <2> Load distribution at the connection When a bending force acts on the connecting portion of the support pillar 20 during an attack, the bending force can be distributed and supported over the entire connecting portion. That is, the bending force acting on the dividing position P1 of the steel pipes 21, 21 is distributed and supported by the internal reinforcing bars 22 and the connecting sockets 20c. The bending force acting on the dividing position P2 of the reinforcing bars 22, 22 is distributed and supported by the steel pipe 21 and the connecting socket 20c. In other words, by shifting the dividing position P1 of the steel pipes 21, 21 and the dividing position P2 of the reinforcing bars 22, 22 inside the connecting socket 20c, it is possible to disperse weak parts and effectively prevent a sudden decrease in the overall load.

[0044] <3> Reasons for combining joint sockets and misaligned splits It is generally known that when connecting divided parts, the divided parts are reinforced by wrapping a reinforcing material around the outer periphery, but the purpose of this is to reinforce the divided parts whose strength has been reduced by the division.

[0045] In contrast, the present invention is similar in that it reinforces the division points, but because the original support 20 is a very high-strength support that uses both steel pipes 21 and reinforcing bars 22, external reinforcement alone is insufficient and further reinforcement is required.

[0046] Therefore, in the present invention, the connection portion is not only covered with the connection socket 20c, but also reinforced and connected by covering the connection socket 20c across the division position P1 of the steel pipes 21, 21 and the division position P2 of the reinforcing bars 22, 22. The present invention does not reinforce the connection portion only with the connecting socket 20c, but shifts the dividing position P1 of the steel pipes 21, 21 and the dividing position P2 of the reinforcing bars 22, 22 to distribute and support the load acting on the connection portion.

[0047] It has been confirmed through demonstration experiments that the split-type support pillar 20 of the present invention can exhibit nearly 100% of the strength (elasticity) compared to a non-split support pillar.

[0048] <4> When there is a difference in height between adjacent posts As described above with reference to FIG. 9, in the case of a flange-type connection structure, if there is a difference in height between adjacent posts 50, there is a risk that the protective loops 31 constituting the protective net will interfere with the flanges 52.

[0049] In contrast, the support pillar 20 of the present invention has a connecting portion simply covered with a flat-shaped connecting socket 20c, and therefore has no protrusions, so that even if there is a difference in height between adjacent supports 20, the protective loop 31 that constitutes the protective net 30 can be installed without any problems. Furthermore, since the wire net material 33 does not protrude when the protective net 30 is attached, there is no need to worry about spoiling the scenery, and the work of connecting the net material 33 and the protective loop 31 using a connecting coil is easy. EXAMPLES

[0050] Other embodiments will be described below. In the description, the same parts as those in the above-mentioned embodiment will be given the same reference numerals and detailed description thereof will be omitted.

[0051] <1> Other connection positions of the pillars In the above-described first embodiment, the connecting portion is formed on the above-ground portion of the support pole 20, but the connecting position of the support pole 20 is not limited to this embodiment.

[0052] FIG. 7 shows a configuration in which the connecting position of the support pole 20 is provided underground. The support pillar 20 in this embodiment is also composed of a lower support pillar 20a, an upper support pillar 20b, and a connecting socket 20c, but the connecting socket 20c together with the lower part of the upper support pillar 20b are configured so as to be buried in the ground. That is, the connecting position of the lower support 20a and the upper support 20b was set underground. No protruding mooring portion 25 is provided at the portion buried in the ground.

[0053] <2> Effects of this Example The present invention not only eliminates the need for a flange protruding from the connecting portion of the support 20 as in the conventional method, but also allows the connecting portion of the support 20 to be placed underground, so that the work of transporting and assembling the support 20 can be carried out smoothly even when the embedded length of the support 20 is long. EXAMPLES

[0054] <1> Other supports with additional reinforcement Another support will now be described with reference to FIG. The pillar 20 in this example is composed of a lower pillar 20a, an upper pillar 20b, and a connecting socket 20c, with one or more auxiliary reinforcement bars 24 additionally installed between the lower pillar 20a and the upper pillar 20b. The auxiliary reinforcing bar 24 is a reinforcing material such as a steel bar, and is embedded in advance in the center of the lower support 20a. The upper end of the auxiliary reinforcement bar 24 is made to a length that does not exceed the upper end of the steel pipe 21 that constitutes the lower support 20a.

[0055] <2> Effects of this Example In this example, in addition to the reinforcing bar 22, auxiliary reinforcing bars 24 are additionally installed inside the support 20, so that, compared to Example 1, the connection strength between the lower support 20a and the upper support 20b is increased and fragility is further improved. [Explanation of symbols]

[0056] 20...post 21... Steel pipe 22 Reinforcement 23... Consolidation material 23a....Consolidation material for connection 24... Auxiliary reinforcement 30. Protective net 31 Protection Loop 32...Buffer 33 Net material 34... Spacing material S...Connection space

Claims

1. A structure of a guardrail support in which multiple reinforcing bars are arranged inside a steel pipe and filled with a cementing material, The support is composed of a lower support divided into upper and lower parts, an upper support, and a connecting socket, a dividing position of the steel pipe constituting the lower column and the steel pipe constituting the upper column and a dividing position of the reinforcing bar embedded in the lower column and the reinforcing bar embedded in the upper column are in a positional relationship shifted along the longitudinal direction of the column, The connecting socket covers the division position of the steel pipe and the division position of the reinforcing bar, Structure of protective fence posts.

2. 2. The structure of a safety fence post as described in claim 1, characterized in that a reinforcing bar is protruded downward from the lower part of the upper post, an upward connecting space is formed at the upper part of the lower post, and the reinforcing bar is accommodated in the connecting space of the lower post and connected to the lower part of the upper post.

3. 2. A structure of a safety fence post according to claim 1, characterized in that an auxiliary reinforcing bar is buried between the upper part of the lower post and the lower part of the upper post.

4. The structure of a protective fence post as described in claim 2, characterized in that an upward connecting space is formed at the top of the lower post, and the connecting space is filled with connecting material to integrally connect the connecting material of the lower post and the connecting material of the upper post.

5. 2. A structure of a safety fence post as claimed in claim 1, characterized in that a lower end of the connecting socket is fixed to an outer circumferential surface of the lower post by welding.

6. 2. A structure of a safety fence post as described in claim 1, characterized in that, of the lower post, the upper post or the connecting socket, at least the upper post has an outer peripheral surface provided with multiple mooring portions for positioning the rope material.

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