KR101036910B1 - Fence for preventing falling stone using bolt type high carbon steel wire rod with high tension - Google Patents

Abstract

The object of the present invention is to provide a rockfall prevention measure configured to improve both tensile performance, workability and economy by using bolt type high tensile steel wire instead of wire rope and newly developing end fixing structure and coupling coupling structure. have.

The technical configuration of the present invention for achieving the above object, the frame is formed by the end struts 40 are spaced apart by a specified distance and the intermediate struts 30 are installed at regular intervals between the end struts 40. A plurality of bolt-type high tensile steel wires 10 having bolt threads 12 formed at both ends thereof are coupled to each other to be horizontally fixed to the intermediate support 30 and the end support 40 at regular intervals. The net 50 installed at a constant height between the struts 40 and the intermediate struts 30 is fixedly coupled to the bolt-type high tensile hard wire 10.

Rockfall prevention measures, end struts, middle struts, mesh, bolt type high tensile steel wire

Description

Falling prevention measures using bolt type high tension hard wire {FENCE FOR PREVENTING FALLING STONE USING BOLT TYPE HIGH CARBON STEEL WIRE ROD WITH HIGH TENSION}

The present invention relates to a rockfall prevention measure using a bolt type high tensile hard wire, and more particularly, to a rockfall prevention measure using a bolt type high tensile hard wire configured to fix a support and a net using a bolt type high tensile hard wire instead of a wire rope.

Rockfall protection measures installed on the slope of the road is a safety structure that is installed to prevent falling rocks falling from the slope to the road causing traffic accidents. This rockfall prevention measure should be installed to maintain a certain tension to absorb the impact energy of the falling rock falling from a high place.

In general, rockfall prevention measures consist of struts that are installed at regular intervals on the ground, nets installed at regular heights between the struts, and wire ropes installed horizontally at regular intervals between the struts to fix the nets to the struts. do. As described above, the rockfall prevention measure requires a certain amount of tension, which depends on the tension performance of the wire rope and the end fixing structure of the wire rope.

As shown in FIG. 1, the wire rope 1 is twisted into 24 strands of fine wires 3 to form one strand 2, and the 6 strands of strands 2 are twisted to form a wire rope having a diameter of 20 mm. It is composed. The wire rope 1 has a high manufacturing cost due to the complicated manufacturing process, but has a low tensile performance against the price, making it difficult to construct an economic rockfall prevention measure. Accordingly, the existing rockfall prevention measures using wire ropes have often caused a problem that rockfalls flow into the road while the net between the wire ropes is opened due to the rockfall impact. Therefore, there is a need in the art for a new material which is cheaper than wire rope and has excellent tensile performance.

As described above, another part which determines the tensile performance of the rockfall prevention measure is the end fixing structure between the wire rope and the end support. In the event of a rockfall impact on a rockfall prevention measure, the greatest force is the anchorage between the end strut and the wire rope. Therefore, when the tensile strength of the end fixing structure is low, the overall tensile performance of the rockfall prevention measure decreases.

In the end fixing structure of the conventional wire rope, there may be a case of using a U-shaped fixing clip or a splice. Figure 2 shows an example of the fall prevention measures using the U-shaped fixing clip.

Rockfall prevention measures 100 are installed on the left and right through the support beam 110 and the support beam 110 is installed in a plurality of road left and right, but the screw rod 121 is coupled to both ends and the fastening member to the screw rod 121 And a plurality of wire ropes 120 to secure the support beam 110 to the support beam 110, a mesh 130 to be coupled to the wire ropes 120 using a spiral fixing coil 131. It is composed of a concrete mortar 140 for firmly fixing the support beam 110.

The wire rope 120 forms a ring 122 on one side of the screw rod 121 and pulls the wire rope 120 tightly to the ring 122 and then ends with a plurality of U-shaped fixing clips 124. Fix it.

The end fixing structure using the U-shaped fixing clip 124 configured as described above has a low self-tensioning force of the U-shaped fixing clip 124, thereby lowering the overall tensile performance, as well as the screw rod 121 and the U-shaped fixing clip 124. As it requires several fastening members, the work itself is complicated. Furthermore, since one wire rope 120 is connected between the end posts, in order to obtain a predetermined tension, the wire rope 120 inserted into the ring 122 of the screw rod 121 had to be pulled tightly on both sides. Required tension was required.

The present invention was developed to solve such a conventional problem, by using bolt type high tensile steel wire instead of wire rope, and newly developed end fixing structure and coupling coupling structure to improve both tensile performance, workability and economy. Its purpose is to provide a rockfall prevention measure that is designed to enable people to do so.

Rockfall prevention measures using the bolt-type high-tension hard line according to the present invention for achieving the above object, the skeleton is formed by the end struts are spaced apart by a specified distance and the intermediate struts are installed at regular intervals between the end struts, both A plurality of bolt-type high tensile steel wires having a bolt thread formed at the end are coupled to each other to be horizontally fixed to the intermediate support and the end support at regular intervals, and a net installed at a constant height between the end support and the intermediate support It is fixedly coupled to the bolt-type high tensile steel wire.

In addition, the bolt-type high-tension hard wire is KS standard HSWR 82B (KS D 3559), carbon (C): 0.79 ~ 0.86% by weight, silicon (Si): 0.15 ~ 0.35% by weight, manganese (Mn): 0.60 ~ 0.90% by weight, phosphorus (P): 0.030% by weight or less, sulfur (S): 0.030% by weight or less, the balance consists of iron (Fe) and other unavoidable impurities.

In addition, an end fixing structure of the end support and the bolt-type high tensile steel wire, the bolt-type high tensile steel wire is installed through the end support, the high tension nut is fixedly fastened to the bolt thread formed on the end via a fixing washer. Is made of.

In addition, the coupling coupling structure between the bolt-type high tensile steel wire is formed in the form of the two bolt threads formed at the end of the adjacent bolt-type high tensile steel wire is fixed and fastened at the same time by a coupling nut formed with a screw hole on both sides.

In addition, the bolt-type high-tension hard wire is installed horizontally at intervals of 100 ~ 150mm at the lower portion of the mesh where the rockfall directly impacts.

According to the rockfall prevention measures using the bolt-type high-tension hard wire according to the present invention configured as described above, it is possible to configure the rockfall prevention measures with excellent tensile performance at a lower cost than when using a wire rope.

In addition, by optimizing the end fixing structure by using bolt type high tensile steel wire, it is possible to obtain a better tensile performance while simplifying the fixing work than when using a wire rope.

In addition, by assembling a plurality of bolt-type high tensile steel wire having a variety of lengths by the coupling coupling, unlike the case of using a single wire rope, it is not necessary to pull it tightly, it can be installed more easily.

Hereinafter, with reference to the accompanying drawings will be described in detail the technical configuration of the fall prevention measures using the bolt-type high-tension hard wire according to the present invention.

Figure 3 shows the overall configuration of the rockfall prevention measures according to the present invention. First, the end strut 40 installed to be spaced apart by a specified distance and the intermediate strut 30 installed at regular intervals between the end strut 40 form a basic skeleton of a rockfall prevention measure. In the case where the total distance for installing the rockfall prevention measures is long, a basic skeleton composed of the two end supports 40 may be repeatedly installed.

As the end support 40, a square steel pipe having a rectangular cross section may be used. The greater the cross-sectional area, the greater the bending rigidity, and the greater the holding force for holding the ends of the bolt-type high tensile hard wire 10. On the other hand, the intermediate pillar 30 is used H-shaped steel is bolted high tensile steel wire 10 is supported through the web.

More specifically, a plurality of bolt-type high tensile steel wires 10 having bolt threads 12 formed at both ends are coupled to each other to be horizontally fixed to the intermediate support 30 and the end support 40 at regular intervals. do.

Finally, the net 50 is attached to a predetermined height between the end support 40 and the intermediate support 30. The mesh 50 is coupled to the bolt-type high tensile hard wire 10 by a coupling member such as the spiral fixed coil 131 shown in FIG. 2, and the bolt-type high tensile hard wire 10 is intermediate the strut 30 and the end. By being fixed to the support 40 is indirectly coupled to the support.

Among the components of the rockfall prevention measures above, the intermediate struts 30, the end struts 40, the mesh 50, etc. are the same as the conventional rockfall prevention measures described with reference to FIG. By using the high tensile steel wire 10, by using it to optimize the end fixed structure and the like to improve both tensile performance, economy and workability.

4 simply shows a bolt-type high tensile steel wire 10, which is the most important technical configuration of the present invention.

The bolt type high tensile steel wire 10 is made of high carbon wire rods to be drawn to make steel wire 11 having a constant diameter (for example, 8 mm), and to process bolt threads 12 at both ends of the steel wire. Are manufactured. Unlike the conventional one installed with one wire rope between both end struts 40, the bolt-type high tensile steel wire 10 is divided into a predetermined length (for example, 9100mm) unit is installed by coupling coupling. Such a coupling coupling structure will be described later with reference to FIG. 6.

The high tensile steel wire used to manufacture the bolt type high tensile steel wire 10 is HSWR 82B (KS D 3559), and the carbon (C): 0.79 ~ 0.86% by weight, silicon (Si): 0.15 ~ 0.35 weight %, Manganese (Mn): 0.60 to 0.90% by weight, phosphorus (P): 0.030% by weight or less, sulfur (S): 0.030% by weight or less, it is preferable to use the one consisting of iron (Fe) and other unavoidable impurities Do. This hard steel wire rod is a high carbon steel product, which is very inexpensive compared to wire ropes and has excellent tensile performance for the price.

The mechanical properties of such high tensile steel wire rods are shown in Table 1 below in comparison with conventional wire ropes.

TABLE 1

Material
Diameter (mm) Breaking load (tonf) Breaking stress (kgf / mm ² ) % Strain at Break Wire rope class G 20 17.2 147.0 * 19.2 High Tensile Hard Steel Wire
HSWR 82B 8 7.9 158.0 17.3

* The breaking stress of the wire rope is the nominal tensile strength against the breaking load of the KS standard

Since the wire rope has a diameter of 20 mm, the overall breaking load is about twice as high as that of the high tensile hard wire (diameter 8 mm). 10kgf / mm ² is high. In addition, the strain of the material at break is about 2% smaller than the high-strength hard wire rod compared to the wire rope. Therefore, the use of high-strength hard steel wire is simpler to manufacture than wire rope made by twisting wires of several strands, and has a high tensile strength (break stress) but low elongation. Moreover, high-strength rigid wire rods are very cost-effective against these tensile performances.

In the present invention, by using such high tensile steel wire, it is possible to optimize the end fixing structure with the end support (40). This end fixing structure according to the present invention will be described in detail with reference to FIG.

First, through-holes (not shown) are formed in the end support 40 having a rectangular cross section at regular intervals, and the bolt-type high tensile steel wire 10 is inserted into the through-holes. The high-strength nut 42 is fastened to the bolt thread 12 formed at the end of the inserted bolt-type high-tension hard wire 10 through a fixing washer 41 to be firmly fixed. The high tension nut 42 is a standard nut (trade name M10) which can be easily purchased on the market, and may be fastened two or more as necessary.

Thus, according to the present invention by using the bolt-type high-tension hard wire 10 in place of the wire rope it is possible to simplify the end fixing structure to the fastening structure of bolts, washers and nuts. As a result, as shown in FIG. 2, workability is greatly improved as compared with the conventional end fixing structure in which complex fastening members such as the screw rod 121 and the U-shaped fixing clip 124 are used.

According to the end fixing structure of the present invention, the overall tensile performance of the rockfall prevention measures is also improved. In the conventional end fixing structure using the U-shaped fixed clip 124, the maximum tensile strength is 4.12 ~ 7.32tonf according to the tightening degree of the clip, while in the end fixing structure according to the present invention, high tension nut as shown in FIG. When one (42) is used, the maximum tensile strength is 5.80 tons, and when two high tension nuts (42) are used, the maximum tensile strength is increased to 8.40 tons, which shows better tensile performance than before.

In the present invention, unlike the conventional connection between a single wire rope between both end struts 40, a plurality of bolt-type high-tension hard wire 10 is coupled to each other by joint coupling to further improve workability. Such a coupling coupling structure will be described in detail with reference to FIG. 6, which is an enlarged view of part “B” of FIG. 3.

The coupling coupling structure of the bolt-type high tensile steel wire 10 has two bolt threads 12, 12 'formed at the ends of adjacent bolt-type high tensile steel wires 10, 10' formed with screw holes 21 on both sides. The coupling nut 20 is configured to be fixed at the same time. Threads may be formed in the inner surface of the screw hole 21 of the coupling nut 20 only in one direction, or both sides may be formed in the other direction. When both threads are formed in different directions, the two bolt-type high tensile steel wires 10 and 10 'can be simultaneously coupled by simply rotating the coupling nut 20 in one direction, so that it can be installed more conveniently.

According to the coupling coupling structure configured as described above, by assembling a plurality of bolt-type high tensile steel wire 10 having various lengths in a prefabricated manner, it is possible to install the entire length to exactly match the distance between the end struts (40). As a result, in the case of using one wire rope 120 as shown in Figure 2 in order to tension the wire rope 120 wire rope 120 to the ring 122 of the screw rod 121 The workability can be further improved by eliminating the process of inserting and pulling it tightly.

As shown in FIG. 7 in which the portion “C” of FIG. 3 is enlarged, the bolt-type high tensile steel wire 10 is penetrated and supported by the insertion hole 31 formed in the intermediate strut 30. At this time, the mesh 50 is installed to be in close contact with the intermediate struts 30 and then fixedly coupled to the bolt-type high tensile hard wire 10 by a spiral fixing clip (not shown).

Finally, the bolt-type high tensile steel wire 10 is preferably installed horizontally at intervals of 100 ~ 150mm at the lower end portion of the mesh 50 directly impacted by rockfall. That is, since the falling rock falling from the slope mainly collides with the lower portion of the rock fall prevention measures, it is preferable to install the bolt-type high tensile hard wire 10 more closely at the lower portion than the upper portion of the rock fall prevention measures. As shown in FIG. 3, when divided into zone 1 corresponding to the lower portion, zone 2 corresponding to the central portion, and zone 3 corresponding to the upper portion, based on the overall height of the rockfall prevention measure, the bolt-type high tensile hardship 10 The top and bottom spacing of is composed of Zone 1 (t ₁ ) <Zone 2 (t ₂ ) <Zone 3 (t ₃ ). The height of each zone depends on the overall height of the rockfall prevention measures, but the height of zone 1, which corresponds to the lower part, is typically between 1000 and 1500 mm.

In the past, when using a wire rope, the distance between the lower end portions of the mesh was generally set to 200 mm. The rockfall prevention measures thus constructed showed a shock absorption energy of 50 kJ in a vertical drop test using a rock weight of 400 kg. Since most of the weight of falling rocks on the slopes in Korea is statistically 400kg, the vertical drop test usually consists of a weight of 400kg of rockfall weight.

On the other hand, according to the present invention, the bolt-type high tensile steel wire was installed at the bottom of the net at intervals of 200 mm, and the vertical drop test was performed with a weight of 400 kg of falling rocks. However, since the price of the bolt-type high tensile steel wire is very cheap compared to the wire rope, when installed at the same interval at the bottom portion of the net, it is possible to reduce the construction cost by more than 20% instead of obtaining the same shock absorbing energy.

When bolt-type high tensile steel wires were installed at the bottom of the net at 150mm intervals, the impact drop energy of 70kJ or more was shown in the vertical drop test using 400kg weight of rock, while the construction cost was reduced by 10%. Therefore, when installed at intervals of 150 mm, tensile performance and economy can be improved at the same time.

When the bolt-type high tensile steel wire is installed at the bottom of the net at 100mm intervals, the impact drop energy of 90kJ or more is shown in the vertical drop test using the falling weight of 400kg, whereas the construction cost is equivalent to that of the conventional wire ropes installed at 200mm intervals. Took.

Thus, considering the overall tensile performance and economics, it is preferable to adjust the spacing of the bolt-type high-tension hard wire installed in the lower portion of the net to 100 ~ 150mm.

1 is a view showing a conventional wire rope.

Figure 2 is a view showing a rockfall prevention measure using a conventional wire rope.

Figure 3 is a view showing a rock fall prevention measure according to the present invention.

Figure 4 is a view showing a bolt-type high tensile steel wire in accordance with the present invention.

5 is a view showing a fixing structure of the end post according to the present invention.

6 shows a coupling nut according to the invention.

7 is a view showing a connection structure of the intermediate struts according to the present invention.

8 is a graph measuring the tensile strength of the bolt-type high tensile steel wire coupled to the end support.

[Description of Reference Numerals]

10: high tensile steel wire with bolt type 20: coupling nut

30: middle post 40: end post

50: netting

Claims (5)

A plurality of bolts having a skeleton formed by the end support 40 installed to be spaced apart by a predetermined distance and the intermediate support 30 installed to be spaced at regular intervals between the end support 40 and bolt ends 12 formed at both ends. Type high tensile steel wire 10 is coupled to each other and horizontally fixed to the intermediate struts 30 and the end struts 40 at regular intervals, and is fixed between the end struts 40 and the middle struts 30. The mesh 50 installed at a height is made to be fixedly coupled to the bolt-type high tensile steel wire 10, The bolt-type high tensile steel wire 10 is a KS standard HSWR 82B (KS D 3559), carbon (C): 0.79 ~ 0.86% by weight, silicon (Si): 0.15 ~ 0.35% by weight, manganese (Mn): 0.60 ~ 0.90% by weight, phosphorus (P): 0.030% by weight or less, sulfur (S): 0.030% by weight or less, the remainder is composed of iron (Fe) and other unavoidable impurities, The end fixing structure of the end support 40 and the bolt-type high tensile steel wire 10 is fixed to the bolt thread 12 formed at the end after the bolt-type high tensile steel wire 10 is installed through the end support 40. The high tension nut 42 is fixedly fastened through the washer 41 for the medium, The coupling coupling structure between the bolt-type high tensile steel wires 10 has two bolt threads 12 and 12 'formed at ends of adjacent bolt-type high tensile steel wires 10 and 10' on both sides thereof. Falling prevention measures using a bolt-type high-tension hard steel wire, characterized in that the formed coupling nut 20 is fixed and fastened at the same time. delete delete delete The method according to claim 1, The bolt-type high-tension hard wire (10) is a rockfall prevention measure using a bolt-type high-tension hard wire, characterized in that horizontally installed at intervals of 100 ~ 150mm from the lower portion of the net 50 directly falling rockfall.

Images