KR20100112939A - Slope stabilization system using rhombus type high tensile wire rope net panel - Google Patents

Abstract

PURPOSE: A slope reinforcement system using a rhombus type high-tensile wire rope net panel is provided to reinforce a rock slope with minimized damage to the landscape. CONSTITUTION: A slope reinforcement system comprises a hexagonal wire net, a rhombus type high-tensile wire rope net panel(200), a transverse tension cable(310), a longitudinal tension cable, exterior anchors, interior anchors(500), hexagonal claw-type anchor plates, and wire rope clips. The hexagonal wire net is made of double-twisted wires and installed on a target slope. The rhombus type high-tensile wire rope net panel is installed on the hexagonal wire net. The transverse and the longitudinal tension cable are installed to fasten and tense the rhombus type high-tensile wire rope net panel in the transverse and longitudinal directions. The exterior anchors are installed on the outer side of the slope to compress the hexagonal wire net and the rhombus type high-tensile wire rope net panel onto the slope by pre-tensioning. The interior anchors fix the rhombus type high-tensile wire rope net panel on the entire surface of the slope to transfer the falling energy applied to the transverse and the longitudinal tension cable by falling rock to the ground to be dissipated. The hexagonal claw-type anchor plates fix the transverse and the longitudinal tension cable and the rhombus type high-tensile wire rope net panel to the interior anchors. The wire rope clips fix the intersecting parts of the rhombus type high-tensile wire rope net panel.

Description

SLOPE STABILIZATION SYSTEM USING RHOMBUS TYPE HIGH TENSILE WIRE ROPE NET PANEL}

The present invention relates to a slope reinforcement system, and more specifically, a double twisted hexagonal wire mesh and a Rhombus type high tension wire rope net panel are prestressed using a transverse tension cable, a longitudinal tension cable, and a hexagonal pressure plate. By strengthening the surface stress, the outside of the Rhombus-type netpanel is an external anchor installed at the top, bottom and side surfaces, and the inside is an internal anchor to support the deep layers, thereby increasing the shear strength of the ground. The present invention relates to a slope reinforcement system using a Rhombus-type high-tensile wire rope netpanel that copes with rockfall protection and deep destruction of the surface by tangential movement of forces acting between the wire rope netpanel and the anchor.

In Korea, more than 70% of the country's land is mountainous, so when large-scale land construction, road construction or railway construction is inevitably formed cut slopes, the number and size is also increasing. Therefore, securing safety in the design and construction of cut slopes is a basic requirement for safe and smooth use of structures such as constructed land or newly established roads and railways. In particular, in recent years, the slopes of natural slopes or artificial slopes have to be urgently constructed in terms of environmental protection or construction cost reduction. Therefore, the risk of slope safety due to natural disasters will be greater. In particular, it is required to secure the safety of such cut slopes in summer guerrilla heavy rains, typhoons, and spring soils or rock slopes, and if the cut slopes lose their safety and collapse, In this case, not only can the stress be secured in the event of a collapsed slope because it leads to the loss of railroads and roads, the loss of traffic, the destruction of houses and buildings, as well as the loss of valuable lives. .

Disaster prevention measures against the collapse of steep slopes require various regulations to be established by setting standards for the design, construction, and maintenance of slopes, but there is still a problem in Korea that there is not enough consideration for them. In the case of cut slopes, measures commonly used in Korea to secure safety are largely divided into protection method (safety rate maintenance method) and reinforcement method (safety rate increase method) according to the safety rate and function of the slope itself. Here, the protection method is divided into rockfall protection net, rockfall prevention fence, rockfall prevention retaining wall and rock tunnel.

Conventional rockfall protection nets currently applied are the main components of wire rope and wire mesh, generally wire mesh of 4.0mm ~ 5.0mm, mesh eyes 50 X 50mm or more on the cut slope, and 2m X 5m, 2m X Install longitudinal and transverse wire ropes at intervals of 7m or 3m X 3m, and then weave the intersections of longitudinal and transverse wire ropes into assembly holes and fix them to the incision surface using fixing pins (D16mm, L500mm). It is constructed.

However, in the conventional general rockfall prevention network, there are frequent occurrences of defects due to structural problems, and the situation is continuously required for improvement. In other words, when a rockfall load occurs, the wire mesh and the wire rope must be sufficiently resisted, but the fundamental problem that the net failure occurs due to the lack of the binding force between the wire mesh and the wire rope continues to arise. The support of the rockfall load, which is the fundamental function of the rockfall prevention net, is possible when the rock-wire rope wire mesh eventually forms an integral support structure. However, the conventional rockfall protection net structure functions as a wire rope that plays an important role in supporting the rockfall load. There is a fundamental problem that the rockfall prevention net itself loses functionality because it is not able to exert.

That is, the conventional general rockfall prevention network has the following problems.

First, since the conventional general rockfall prevention net is for the small-scale rockfall prevention, the wire mesh as a component is often broken,

Second, due to the lack of cohesion between the wire rope and the wire mesh, the vulnerable wire mesh rupture frequently occurs when a rockfall load occurs.

Third, the fixing pin for fixing the wire mesh and the wire rope does not exhibit sufficient pull-out resistance, there is a problem that the fixing pin is released,

Fourth, when a rockfall load occurs, since the strain starts to exert a tensile force in the wire mesh, there is a problem that there is a gradual progressive failure.

The present invention was created to overcome the problems of the conventional general rockfall prevention network as described above, and a double twisted hexagonal wire mesh is installed on the target slope; It is installed on the double twisted hexagonal wire mesh and consists of a high tensile wire rope having a diameter of 8 mm, and the size of the net panel is selected from 3.0m X 3.0m, 3.5m X 3.5m or 4.0m X 4.0m High tension wire rope net panels; A transverse tension cable and a longitudinal tension cable which are installed to fasten and tension the Rhombus-type net panel in a transverse direction and a longitudinal direction, wherein the transverse tension cable and the longitudinal tension cable are selected from a high tension wire rope having a diameter of 12 mm, 14 mm, 16 mm or 18 mm; The double anchored hexagonal wire mesh and the Rhombus-type high-strength wire rope netpanel are pre-tensioned to be squeezed onto the slope, and an external anchor is installed on the outside of the slope, that is, the upper fixed anchor and the upper portion are installed on the top. A fixed anchor cable and a lower fixed anchor provided on the lower end, and a side fixed anchor and a side fixed anchor cable installed on the side; By fixing the Rombus-type netpanel on the entire inclined surface, when falling rock occurs, the falling energy transmitted to the transverse and longitudinal tension cable is transmitted to the ground surface to be extinguished, and the transverse tension cable and the longitudinal tension cable An internal anchor installed at the intersection of the two or at the contact points of the two regions; And a hexagonal toe nail plate for fixing the transverse and longitudinal tension cables and the Rhombus-type net panel to the inner anchor, and a wire rope clip for fixing the intersection of the Rhombus-type high tension wire rope netpanel. Slope reinforcement according to the present invention is provided by providing a slope reinforcement device using a Rhombus-type high-tensile wire rope net panel, which is installed in an area where cracks or slopes may be severely cracked or in areas requiring a severe slope or partial construction. By making the device an integral support structure, the slope reinforcement is achieved more safely and reliably at lower cost.

That is, the slope reinforcement apparatus using the Rhombus type high tension wire rope net panel according to the preferred embodiment of the present invention replaces the PVC coated wire mesh, which is generally used, with a double twisted hexagonal wire mesh, and thereon Rombus-type high-strength wire rope netpanel made of 8mm diameter wire rope is installed, and it is integral with the longitudinal and transverse tension cable to integrate the entire slope, which is fundamental to the existing rockfall prevention network It is an innovative slope reinforcement system that solves the problem.

The slope reinforcement system using the Rhombus type high tension wire rope net panel according to the present invention has a double reinforcement effect on a slope because it is coated with a high strength wire rope net panel on a double twisted hexagonal wire mesh. Through the systematic binding of directional tension cable and Rhombus-type net panel, the entire slope is integrated and reinforced, and it is supported by the deep anchor through anchoring plate and pressure plate to enhance the shear strength of the base, and the surface layer and deep layer are integrated with the net panel. As a result, rock formations with severe cracks, rockfall frequent areas, or areas where surface sliding is more likely to occur, as well as rock slopes with severe development of discontinuities such as jointing, stratification, and faults, or strata with selective differential weathering are formed. View slopes more clearly in areas where sliding can occur This has the effect of.

In addition, the slope reinforcement system using the Rhombus-type high-strength wire rope net panel according to the present invention has an effect that can cope with the shotcrete which is constructed in the area where rockfall may occur due to loose areas or rock fragments on the slope, It is advantageous in that it can be used as an alternative method for anchoring in areas where fractures are highly developed in rock, pattern anchoring is needed, or areas where plate-like or wedge fractures can occur.

Furthermore, the slope reinforcement system using the Rhombus type high-strength wire rope net panel according to the present invention is simple by tensioning the female body with the wire rope net panel and the inner and outer anchors when the large rock body at the bottom has a high possibility of falling. It is effective to prevent rockfall at low cost, and if there is concern of falling rocks of large independent rocks in national parks or scenic areas, there is an excellent effect of reinforcing them while minimizing damage to natural landscapes.

Hereinafter, with reference to the preferred embodiment of the present invention and the accompanying drawings, it will be described in more detail.

First, the operation concept of the present invention will be briefly described. In the slope reinforcement system using the Rombus type high tension wire rope net panel of the present invention, a load such as a rockfall generated on an inclined surface has a high tension wire rope net panel according to the present invention. Falling energy is transmitted to the transverse tension cable 310 and the longitudinal tension cable 320 during the collision with the fall, this fall energy is transmitted to the outer anchor 400 and the inner anchor 500, the energy through the ground surface To disappear.

That is, the Rhombus-type high tension wire rope net panel and the double twisted hexagonal wire mesh are pressed onto the slope through pre-tensioning of fixed anchors installed on the top, bottom, and side surfaces of the slope. This is for the effective absorption of the rock load, and prevents rock or rock loosening in advance. In addition, the loosening load is transmitted through the transverse tension cable and the longitudinal tension cable that bind the Rombus-type wire rope net panel and the double twisted hexagonal wire mesh, and the tensile force generated in the Rombus-type wire rope net panel is anchor installation point. To be absorbed by the entire system.

1 and 2 illustrate a schematic diagram and a perspective view of a slope reinforcement system using a Rhombus type high tension wire rope net panel according to a preferred embodiment of the present invention.

According to a preferred embodiment of the present invention as shown in the drawings, the Rhombus-type slope reinforcement device according to the present invention and the hexagonal double twisted wire mesh and Rhombus type high-strength wire rope net panel installed on the entire target slope Pretensioning the transverse and longitudinal tension cables for binding and tensioning the hexagonal double twisted wire mesh and the Rhombus-type netpanel in the transverse and longitudinal directions; and the hexagonal double twisted wire mesh and the Rhombus-type wire rope netpanel. The external anchors (upper fixed anchor, lower fixed anchor, side fixed anchor) that are pressed onto the slope through the internal anchor are installed at the intersection of the horizontal wire rope and the longitudinal wire rope or at the contact points of the two areas. It is a component.

Looking at the basic components according to the present invention in more detail, the double twisted hexagonal wire mesh 100 is installed on the slope and is installed directly below the Rhombus type high-strength wire rope net panel described below It is used to cope with PVC coated wire mesh generally used in conventional conventional rockfall protection net.

Next, the Rhombus type high tension wire rope net panel 200 is manufactured as a net panel using a high tension wire rope. The high-strength wire rope may be a wire rope of various diameters, but preferably, a wire rope of 8 mm diameter is used, and a wire rope having a tensile force of 1,770 N / mm 2 or more is preferably used. The high tension wire rope net panel 200 is preferably selected from 3.0m X 3.0m, 3.5m X 3.5m or 4.0m X 4.0m, the grid size of the netpanel is preferably 30cm X 30cm, Site conditions do not restrict the use of different sized netpanels and their grids.

The transverse tension cable 310 serves to evenly transfer the rockfall load absorbed from the Rombus-type wire rope net panel 200 to the fixed anchor, and the longitudinal tension cable 320 is a respective Rombus-type wire rope. By connecting the net panel 200 serves as a rockfall load can be transmitted to the transverse tension cable installed on the top. The transverse tension cable 310 and the longitudinal tension cable 320 is composed of a high-strength wire rope of diameter 12mm, 14mm, 16mm or 18mm, the load acting by the dead weight on the slope is generally compared to the longitudinal load Since the transverse load acts greatly, the diameter of the transverse tension cable 310 is typically formed larger than the diameter of the longitudinal tension cable 320. According to a preferred embodiment of the present invention, the transverse tension cable consists of a high tensile wire of 16 mm in diameter, and the longitudinal tension cable consists of a high tensile wire of 12 mm in diameter.

In addition, the high tension wire rope net panel, the transverse tension cable and the longitudinal tension cable may be subjected to special electroplating (supercoating) as necessary. In other words, after forming a hard zinc layer on the steel wire to minimize the formation of a hard zinc layer on the steel wire to form a more complete corrosion-resistant plating layer than the conventional zinc plating method of integrating a ductile pure zinc layer, aluminum and zinc of the general strength on the outer surface In order to be able to integrate the (Al / Zn) alloy layer, a corrosion-resistant plating layer having aluminum added (95% Zn + 5% Al) is formed during the galvanizing process. The advantages of this special electroplating (supercoating) are high surface resistance, improved resistance to active corrosion media, and much longer life compared to conventional zinc coating under the same environmental conditions.

3 and 4 illustrate an internal detailed view of a slope reinforcement system using a Rhombus-type high tension wire rope net panel according to a preferred embodiment of the present invention.

As shown in the figure, the hexagonal nail plate 510 is used to secure the transverse tension cable 310 and the longitudinal tension cable 320 to the inner anchor 500. The acupressure plate 510 serves to increase the safety and practicality of the slope reinforcement system according to the present invention by closely contacting the Rombus-type wire rope net panel to the slope while preventing the separation between the inner anchor and the tension cable when the load is generated. . In addition, according to a preferred embodiment of the present invention, the inner anchor 500 is installed at the intersection of the transverse tension cable 310 and the longitudinal tension cable 320 or at the contact point of the two areas, the inner Anchors should be designed to accept the full load of adjacent areas. On the other hand, in consideration of the topography of the slope and the construction conditions, a secondary anchor can be used to increase the tension of the Rombus-type wire rope netpanel on the slope.

Figure 5 shows a detailed view of the top anchor installation of the slope reinforcement system according to the present invention. As shown, the upper end fixing anchor 410 made of a spiral is provided on the upper end of the target slope, the longitudinal tension cable 320 and the transverse tension is installed at regular intervals using the upper fixing cable 411 It is connected with the cable 310. Therefore, the upper fixed anchor cable is installed at the upper end of the slope to effectively absorb the load transferred from the transverse tension cable and the longitudinal tension cable to serve to transfer to the upper fixed anchor. The transverse tension cable 310 installed at the upper end is connected to the Rombus-type wire rope net panel located at the top of the inclined surface, and is fixed to the spiral side fixing anchors 430 provided at the left and right ends of the inclined surface.

On the other hand Figure 6 shows a detailed view of the lower anchor installation of the slope reinforcement system according to the present invention. As shown, the lower end of the slope reinforcement system according to the present invention is installed at a constant interval, preferably 4 m intervals of the lower end of the fixed anchor 420 spirally, the Rombus-type wire rope netpanel and a constant thickness, preferred In general, it is connected to the transverse tension cable 310 having a diameter of 16mm.

Figure 7 shows a detailed view of the side anchor installation of the slope reinforcement system according to the present invention. As shown, both side end portions of the slope reinforcement system according to the present invention connect a helical side fixed anchor 430 and a transverse tension cable 310 having a constant diameter, preferably a diameter of 16 mm.

Figure 8 shows a detailed view of the installation of the inner anchor according to the present invention. As shown, the inner anchor 500 may be installed at the intersection of the transverse tension cable 310 and the longitudinal tension cable 320, the inner anchor 500 is fixed by the hexagonal claw fixing plate 510 It is done.

9A to 9D are views showing an inner anchor, a hexagonal claw-type pressure plate, a fixed anchor cable, and a fixed anchor used in a slope reinforcement system according to the present invention, respectively. According to a preferred embodiment of the present invention, the inner anchor is preferably a lock bolt made of SD40 material having a diameter of 29 mm and an allowable load of 11.6 tf, and the upper fixed anchor has a spiral wire rope having a diameter of 18.5 mm and a allowable load of 32.1 tf. It is preferred to be used, and the lower and side anchoring anchors are preferably spiral wire ropes with a diameter of 14.5 mm and a permissible load of 19.9 tf, but are not intended to limit the use of other members which can achieve the same purpose. The anchors shall not be drawn due to the frictional resistance and the stress of the principal surface and the tensile failure of the anchor material shall not occur. The fixed anchor cable is fixed to the remote fixed anchor at the top and side of the slope, and the length can be adjusted according to the installation position.

According to another embodiment of the present invention, the slope reinforcement method using the Rombus-type high-strength wire rope net panel of the present invention is performed in the following construction flowchart.

<Construction Flow Chart>

Looking at this in more detail, the slope reinforcement method using the Rombus-type high-strength wire rope net panel of the present invention,

(1) a first step of selecting an inclined surface to install the slope reinforcing device according to the present invention and performing a pre-stop operation on the upper portion of the target inclined surface;

(2) a second step of installing an upper fixed anchor 410 on the upper end of the target inclined surface;

(3) Hexagonal wire netting 100 and Rombus-type wire rope net panel 200 twisted to the upper part of the inclined surface temporarily fixed by iron hook or hook, the double-twisted hexagonal wire mesh and Rombus-type wire rope net panel ( The third step of installing the double twisted hexagonal wire mesh 100 and the Rhombus-type wire rope net panel 200 over the entire slope, and then initially Two Rhombus-type net panels are installed in a vertical direction to match the upper end of the inclined surface.

(4) a fourth step of assembling the tension cable at the upper end to fix the double twisted hexagonal wire mesh 100 and the Rhombus-type wire rope net panel 200 to the anchor head by fixing and supporting the anchor head;

(5) a fifth step of assembling the Rhombus-type wire rope net panel 200 until the entire surface of the inclined surface is completely covered by the same method as the first to fourth steps;

(6) connecting the Rhombus-type wire rope net panel 200 to the longitudinal tension cable 320 from the upper end to the lower end of the inclined surface, and the clamp of the longitudinal tension cable is connected to the Rhombus-type wire rope net panel 200. A sixth step mounted to the end and performing longitudinal sewing of the Rombus-type wire rope net panel 200 connected to the anchor head starting from the top of the inclined surface;

(7) A Rhombus-type wire rope netpanel that sews a longitudinally tensioned cable 320 and a temporarily assembled Rombus-type wire rope netpanel 200 with a transverse tension cable 310 to the target slope edge anchor head. A seventh step of performing a transverse stitching operation of (200);

(8) an eighth step of drilling the corresponding portions of the left and right side portions and the lower end portions of the entire target slope, and drilling and installing the side fixed anchors 430 and the lower fixed anchors 420 on the left and right side portions; ;

(9) The transverse tension cable installed at the lower end of the inclined surface connects the Rombus-type wire rope net panel 200 and the lower fixed anchor at the lower slope, and clamps the end of the tension cable in the transverse direction at the lower slope. A ninth step of installing the tension cable;

(10) Rombus-type wire rope netpanel, which adjusts the position of the Rombus-type wire rope netpanel 200 by pulling the tension cable, the transverse and longitudinal tension cable on the inclined surface in the bidirectional direction below the working load of the anchor. A tenth step of performing a pulling operation of 200; And

(11) After fixing the Rombus-type wire rope net panel 200 to move vertically or horizontally, the inner anchor 500 is fixed at the intersection of the transverse and longitudinal tension cables, and the tightening effect of the net panel. The Rhombus-type wire rope net panel 200 is applied to the entire inclined surface by using the hexagonal claw type fixing plate 510 to increase the tensile force by bringing the Rhombus-type wire rope net panel 200 into close contact with the inclined surface. It is characterized by consisting of the eleventh step of fixing and tensioning.

Each component used in the slope reinforcement method using the Rhombus type high tension wire rope net panel of the present invention as described above, and the components described above with respect to the slope reinforcement device using the Rhombus type high tension wire rope net panel same.

That is, according to a preferred embodiment of the present invention, the Rhombus type high tension wire rope net panel 200 is made of a high tensile wire of 8 mm in diameter, and the size of the net panel is 3.0 m X 3.0 m or 3.5 m X 3.5 m. Or 4.0m X 4.0m, the grid size is 30cm X 30cm, the tension wire rope of 12mm or 14mm or 16mm or 18mm diameter of the transverse tension cable 310 and longitudinal tension cable 320 It is selected from. In addition, the Rhombus-type high-strength wire rope netpanel 200, the transverse tension cable 310 and the longitudinal tension cable 320 is aluminum and zinc (Al) of general strength on the outer surface after minimizing the formation of hard zinc layer on the steel wire In order to integrate the / Zn) alloy layer, a corrosion resistant plating layer in which aluminum is added (95% Zn + 5% Al) is formed during the galvanizing process.

Next, a preferred design criterion for applying a slope reinforcement system using a Rhombus type high tension wire rope net panel according to the present invention will be described.

■ Design Criteria

(1) Review of Rhombus type high tension wire rope net panel

end. Examination conditions: Based on the maximum size of rock falling in the unit area (per 1m2) in case of severe fractured rock, conduction in one net panel (4.0m × 4.0m) in case of independent relaxation rock Estimate the rock load from the actual size of rock that is expected to drop out.

I. Review method: Examine the net panel's allowable load (= break load / 2) and the rockfall load.

      : Rockfall load (tf) <Net Panel allowable load (tf) → ∴ O.K

(2) Review of transverse tension cable

end. Examination condition: The transverse tension cable serves to evenly transfer the absorbed load from the wire rope net panel to the anchor. Therefore, it is assumed that it receives an equal distribution load corresponding to the expected rockfall load, and it is designed by the tensile force (acting load) generated by the wire rope.

I. Method of Examination: Compare the allowable load (= breaking load × 0.6) of the wire rope with the working load.

: Working load of wire rope (tf) <Allowable load of wire rope (tf) → ∴ O.K

(3) Examination of longitudinal tension cable

end. Examination condition: The longitudinal tension cable connects each wire rope panel so that the falling load can be transferred to the transverse tension cable installed on the upper part. Considering the sharing area of each tension cable, the stability check should be conducted from the falling load.

I. Method of Examination: Compare the allowable load (= breaking load × 0.6) of the wire rope with the working load.

: Working load of wire rope (tf) <Allowable load of wire rope (tf) → ∴ O.K

(4) Review of fixed anchor cable

end. Examination condition: The fixed anchor cable is installed at the upper end of the slope to effectively absorb the load transferred from the transverse and longitudinal tension cables and transfer it to the upper anchor. Therefore, the load acting on the fixed anchor cable is the sum of the working loads of the lateral and longitudinal wire ropes.

I. Examination method: Examine the fixed anchor cable by comparing the allowable load (= breaking load × 0.6) with the working load.

: Working load of fixed cable (tf) <Allowable load of fixed cable (tf) → ∴ O.K

(5) Review of side fixed anchor

end. Examination condition: The transverse tension cable is fixed to the side anchoring anchor. Therefore, the design load rating of the side anchor anchor is consistent with the guaranteed cutting load of the transverse tension cable.

I. Review Method: Examine the allowable load of the side anchor anchor and the guaranteed cutting load of the transverse tension cable.

: Guaranteed cutting load of transverse tension cable (tf) <Allowable load of side anchor (tf)

                                                            → O.K

(6) Review of upper fixed anchor

end. Condition of review: The fixed anchor cable is fixed to the fixed anchor at the top of the slope. Therefore, the design load rating of the upper end of the slope corresponds to the guaranteed cutting load of the fixed anchor cable.

I. Method of Examination: Compare the allowable load of the upper fixed anchor with the allowable load of the fixed anchor cable.

: Guaranteed cutting load of fixed cable (tf) <Design load of upper anchor (tf) → ∴ O.K

(7) Review of internal fixed anchor

end. Examination condition: Internal fixed anchors are installed at the intersection of transverse and longitudinal tension cables or at the contact points of two areas. Therefore, the internal fixed anchor should be designed to receive the total load of the adjacent area, and the design load of the internal fixed anchor is the same as the breaking load of the Rhombus-type net panel.

I. Method of Examination: Compare the allowable load (= yield load / 2) of the internal fixed anchor with the break load of the Rhombus type net panel.

: Breaking load of net panel (tf) <Allowable load of internal anchor (tf) → ∴ O.K

■ load rating

In the case of severe fractured rocks, the fall or fall of one netpanel (4.0m × 4.0m) may occur in the case of an independent relaxation rock based on the maximum size of rock falling in the unit area (per square meter). Estimate the load of rockfall from the actual size of rock that is expected to occur. In general, Fs is set to 2 when the slope is urgent.

<Table 1> Load Rating of Arm Attached Network

Note 1) Concentrated loads are related to local jungle or behavior and are calculated as follows, assuming three rock masses fall out within each 4m × 4m area. Concentrated load = working load / 3 / Fs

NOTE 2 In the case of severe fractured rocks, it is assumed that one rock mass per square meter is dropped as follows. Payload / Fs

The following describes an embodiment of a structural calculation for applying a slope reinforcement system using a Rhombus type high tension wire rope net panel according to the present invention.

■ Calculation of Structure

A. Design Conditions

B. Structural Calculation

1) Correction coefficient according to slope

라고 하면

Say

2) Review of working load

① Load acting on wire rope net panel

② Load on tension cable

3) Review of wire rope net panel

① Specification

  -Type 0/8/300, Rhombus type netpanel with 4.0m width x 4.0m length

  -Breaking load of wire rope net panel: 76 kN

② Stability Review

적용)-Allowable load of wire rope net panel: (

apply)

76 kN / 2 = 38 kN = 3.88 tf

-Rockfall load acting on wire rope net panel:

- Review the results :

  3.40 tf <3.88 tf ∴ O.K

4) Review of stability of transverse tension cable

① Specification: D 16mm, Guaranteed Cutting Load: 150 kN (15.3 tf)

② The transverse tension cable plays a role in transmitting the load absorbed from the wire rope net panel to the anchor evenly. Therefore, it is assumed that the load is equivalent to the expected rockfall load, and the design is based on the tensile force generated in the tension cable.

③ In design, it is assumed that tension cable is installed every 3 ~ 4m. Each wire rope netpanel is suspended from the upper transverse tension cable and has an equally distributed load corresponding to the breaking load of the maximum tension cable.

④ Stability Review

The allowable load of the D16mm tension cable applied to this design was considered as ultimate load by the guarantee cut load (15.3tf) and 0.6 × (guarantee cut load) = 9.18tf. (Permanent anchor-always applied)

∴ O.K

∴ OK

) Where d is the amount of deflection (

)

5) Stability Review for Longitudinal Tension Cable

① Specification: D 12mm, Guaranteed Cutting Load: 84.6 kN (8.6tf)

② Longitudinal tension cable connects each wire rope net panel so that rockfall load can be transferred to upper transverse tension cable. Therefore, the stability should be examined from the falling rock load considering the sharing area of each tension cable.

) ③ Stability Review: Rope Force (

)

  The allowable load of the D12mm tension cable applied to this design was considered as the ultimate cutting load (8.6 tf) and 0.6 × (guaranteed cutting load) = 5.16 tf. (Permanent anchor-always applied)

∴ O.K

∴ OK

6) Stability Review for Fixed Anchor Cables

① Specifications: D22mm, Guaranteed Cutting Load: 304kN (31.0tf)

② The fixed anchor cable is installed at the upper end of the slope to effectively absorb the load transferred from the transverse and longitudinal tension cables and transfer it to the upper fixed anchor.

) ③ Stability Review: Rope Force (

)

  The allowable load of the D22mm fixed anchor cable applied to this design was considered to be the ultimate load by the guarantee cutting load (31.0 tf) and 0.6 × (guaranteed cutting load) = 18.6 tf. (Permanent anchor-always applied)

  At this time, the working load of the fixed anchor cable is equal to the sum of the working loads of the transverse tension cable and the longitudinal tension cable.

∴ O.K

∴ OK

7) Review of fixed anchors (side, top)

① Specification:

  -Side fixed anchor: D14.5mm X 2, Allowable load: 195kN = 19.9tf

  -Fixed anchor at upper part: D18.5mm X 2, Allowable load: 315kN = 32.1tf

② The transverse tension cable is fixed to the side anchoring anchor. Therefore, the design load rating of the side anchor anchor matches the guaranteed cutting load of the transverse tension cable.

③ The fixing cable is fixed to the fixing anchor at the top of the slope. Therefore, the design load of the slope fixed anchor matches the guaranteed cutting load of the fixed cable.

④ Stability Review

  -Fixed side anchor: 15.3tf <19.9tf ∴ O.K

  -Fixed anchor at upper part: 31.0tf <32.1tf ∴ O.K

상단부 고정앵커의 해석모식도

Schematic diagram of fixed anchor in upper part

8) Review of internal anchors

① Specification: D29mm, Allowable load: 11.6tf

② Internal anchors are installed at the intersection of transverse and longitudinal tension cables or at the contact points of two areas. Therefore, the internal anchor should be designed to receive the total load of the adjacent area, where the design load of the internal anchor is equal to the breaking load of the net panel.

Schematic diagram of internal anchor

③ Therefore, the design load of internal anchor is 76kN (= 7.8tf).

④ Stability Review: Anchor Force (P)

    7.8tf <11.6 tf ∴ O.K

C. Review of fixed anchor length

The design of fixed anchors is to specify the design, material and specification to satisfy the following conditions for the design load.

ㆍ Anchor is not drawn due to ambient frictional resistance and adhesion stress

ㆍ No tensile failure of anchor material

Design is performed based on two conditions.

1) safety factor

The safety factor used for the calculation of the anchor length is considered to be equivalent to the "permanent anchor-always" in the safety factor for the allowable pulling force shown in Table 3 below, and Fs = 2.5 is applied.

2) Permissible adhesion stress of steel

The allowable bond stress of the steel against the grout is shown in Table 4 below.

, 게비앵커는

을 사용한다.

Gavi anchors

Use

Note) Design base strength of grout: 24N / mm2

3) Main surface friction resistance

In the case of using the anchor type foundation, the ultimate principal frictional resistance of the anchoring ground and the grout is shown in Table 5 below. However, <Table 5> is only a reference value, and the field resistance and ultimate friction resistance of the construction site should be obtained by conducting field surveys and tests.

4) Minimum installation length of anchor

The minimum value of the anchor's basic length used for anchor type foundation is set to 2m. In general, the length of the ground anchor is divided into a free field and a anchorage, and a free field is defined to satisfy 4.0m or more and the anchorage is 3.0m to 10.0m.

The reason that the free field is 4.0 m or more is to prevent displacement from occurring due to the prestress introduced to the ground anchor, and the load decreases according to the creep of the anchoring ground. This is the length set for the purpose of acting on the anchor itself without reducing the design prestress. In addition, the basis of setting the anchorage of 3.0 m or more is a value designed for sufficiently coping with the geological change of the anchoring layer to be anchored, which is also set on the premise of introducing prestress.

The anchor used in the present invention is different from the ground anchor, and does not need to secure a free ledger because it does not have a so-called tension settled in the ground anchor that introduces prestress during installation. Therefore, the fixed anchor according to the present invention sets the minimum required anchoring length to 1.0 m, and also takes into account the anchoring uncertainty factors such as the possibility of occurrence of voids in the grout under load, weathering in the slope surface even if the ground of the anchoring position is good. Be sure to secure 1.0m in addition to the required length, and make the minimum anchor installation length 2.0m.

5) Calculation of the length of each fixed anchor

① Length obtained from principal surface frictional resistance with ground

② Length obtained from attachment of anchor and grout

Calculate two values of and designate large value as design anchor length.

① Length obtained from principal surface frictional resistance with ground

  The length obtained from the principal surface frictional resistance with the ground is calculated by the following equation.

Fixed side anchor:

Slope Fixed Anchor:

Internal fixed anchor:

② Length obtained from attachment of fixed anchor and grout:

  The length obtained from the attachment of the fixed anchor to the grout is calculated by the following equation.

From the above calculation result,

ㆍ The autumn layer is difficult to evaluate as anchor anchoring ground.

ㆍ Fixed anchor should have minimum installation length of 2.0m.

The fixed anchor lengths considering these are shown in <Table 7>.

The present invention having the configurations and effects described above can be modified in various ways, and the above description is not intended to limit the scope of the present invention. In addition, various modifications and variations are possible without departing from the spirit and scope of the invention, and modifications apparent to those skilled in the art to which the invention pertains are included in the following claims.

1 is a conceptual diagram of a slope reinforcement system using a Rhombus-type high tension wire rope net panel according to an exemplary embodiment of the present invention.

2 is a perspective view of a slope reinforcement system according to a preferred embodiment of the present invention;

3 and 4 are detailed internal views of the slope reinforcement system according to a preferred embodiment of the present invention.

Figure 5 is a top anchor installation detail of the slope reinforcement system according to the present invention

Figure 6 is a bottom anchor installation detail of the slope reinforcement system according to the present invention

Figure 7 is a detailed view of the side anchor installation of the slope reinforcement system according to the present invention

8 is a detailed view of the inner anchor installation according to the present invention

9A, 9B, 9C, and 9D are views illustrating an inner anchor, a hexagonal claw-type pressure plate, a fixed anchor cable, and a fixed anchor according to a preferred embodiment of the present invention, respectively.

<Description of the symbols for the main parts of the drawings>

100: double twisted hexagonal wire mesh 200: Rhombus type high-strength wire rope net panel

310: transverse tension cable 320: longitudinal tension cable

400: external anchor 410: upper fixed anchor

411: upper fixed anchor cable 420: lower fixed anchor

430: side fixed anchor cable 431: side fixed anchor cable

500: internal anchor 510: hexagonal nail plate

520: wire rope clip

Claims (8)

A double twisted hexagonal wire mesh 100 installed on the target inclined surface; Is installed on the double twisted hexagonal wire mesh 100, made of a high-strength wire of 8mm diameter, the size of the net panel is selected from 3.0m X 3.0m or 3.5m X 3.5m or 4.0m X 4.0m A Rhombus type high tension wire rope net panel 200; It is installed to fasten and tension the Rhombus-type net panel 200 in the transverse and longitudinal directions, and the transverse tension cable 310 and the longitudinal direction is selected from a high tension wire rope of 12mm or 14mm or 16mm or 18mm in diameter. Tension cable 320; The external anchor 400, ie, the upper end, which is installed on the outside of the slope to squeeze the double twisted hexagonal wire mesh 100 and the Rhombus type high tension wire rope net panel 200 to the slope through pre-tensioning. The upper fixed anchor 410 and the upper fixed anchor cable 411 and the lower fixed anchor 420 is installed on the lower end, and the side fixed anchor 430 and the side fixed anchor cable is installed on the side 431); By fixing the Rombus-type net panel 200 to the entire surface of the inclined surface, when falling rock occurs, the falling energy transmitted to the transverse and longitudinal tension cable is transmitted to the ground surface to be extinguished, and the transverse tension cable 310 An inner anchor 500 installed at an intersection of the longitudinal tension cables 320 or at a contact point of two regions; Hex claw type pressure plate 510 for fixing the transverse and longitudinal tension cables 310 and 320 and the Rhombus-type net panel 200 to the inner anchor 500, and the Rhombus-type high tension wire rope netpanel. Slope reinforcement using a Rombus-type high-tensile wire rope netpanel, characterized in that the wire rope clip 520 for fixing the intersection of the 200 The slope reinforcement apparatus of claim 1, wherein the lattice size of the Rhombus-type high tension wire rope net panel 200 is 30 cm X 30 cm. According to claim 2, wherein the transverse tension cable 310 is made of a diameter of 16mm, the longitudinal tension cable 320 is using a Rombus-type high-tensile wire rope net panel, characterized in that made of a diameter of 12mm Slope reinforcement device 4. The aluminum according to any one of claims 1 to 3, wherein the aluminum and zinc (Al / Zn) alloy layers of normal strength are integrated on the outer surface after minimizing the formation of the zinc layer on the steel wire. (95% Zn + 5% Al) is added to the corrosion resistance plating layer is formed on the Rhombus type high tension wire rope net panel 200 and the transverse tension cable 310 and the longitudinal tension cable 320 Slope reinforcement using Rhombus type high tension wire rope net panel A first step of selecting an inclined surface to be installed and performing a stop operation on the upper portion of the inclined surface; A second step of installing the upper fixed anchor 410 on the upper end of the inclined surface; Fix the double twisted hexagonal wire mesh 100 and the Rombus-type wire rope netpanel 200 to the upper part of the target slope temporarily with a hook or a hook, and the double twisted hexagonal wire mesh and the Rombus-type wire rope netpanel at the bottom of the target slope The third step of installing the double twisted hexagonal wire mesh 100 and the Rhombus-type wire rope netpanel over the entire slope after spreading down in the vertical direction, A fourth step of assembling a tension cable at the upper end to fix the double twisted hexagonal wire mesh 100 and the Rhombus-type wire rope net panel 200 to the final head by connecting and supporting the anchor head; A fifth step of assembling the Rhombus-type wire rope net panel 200 until the target slope surface is completely covered by the same method as the first to fourth steps; The Rhombus-type wire rope net panel 200 is connected to the longitudinal tension cable 320 from the upper end to the lower end of the inclined surface, and the clamp of the longitudinal tension cable is connected to the end of the Rhombus-type wire rope net panel 200. A sixth step of performing longitudinal sewing of the Rombus-type wire rope net panel 200 which is mounted and connected to the anchor head starting from the top of the inclined surface; Rhombus-type wire rope netpanel 200, which is sewn with a longitudinal tension cable (320) and temporarily assembled Rhombus-type wire rope netpanel 200 to the target slope edge anchor head with a transverse tension cable (310). A seventh step of carrying out the transverse sewing operation of, An eighth step of drilling the corresponding portions of the left, right, and bottom portions of the entire target slope to perforate the left and right side fixed anchors and the bottom fixed anchors; A transverse tension cable is installed at the bottom of the inclined surface to connect the Rombus-type wire rope net panel 200 and the lower fixed anchor to the lower end of the inclined surface by clamping the end of the tension cable with a transverse tension cable installed at the lower end of the inclined surface. With the ninth step, Rombus-type wire rope net panel 200 to adjust the position of the Rombus-type wire rope net panel 200 by pulling the tension cable, the transverse direction and the longitudinal tension cable in the upper side of the inclined surface in the bi-direction below the working load of the anchor. With the tenth step to perform the pulling operation of, After fixing the Rombus-type wire rope net panel 200 so as not to move vertically or horizontally, the inner anchor is fixed at the intersection of the transverse and longitudinal tension cables, and the hexagonal claws to increase the tightening effect of the net panel. The eleventh step of fixing and tensioning the Rhombus-type wire rope netpanel 200 with respect to the inclined front surface to increase the tensile force by closely contacting the Rhombus-type wire rope netpanel 200 to the target inclined plane by using a type fixing plate. Slope reinforcement method using a Rhombus type high tension wire rope net panel The Rhombus type high tension wire rope net panel 200 is made of a high tensile wire rope having a diameter of 8 mm, and the size of the net panel is 3.0 m X 3.0 m or 3.5 m X 3.5 m or 4.0 m X. Slope reinforcement method using the Rhombus type high tension wire rope netpanel, which is selected from 4.0m and the grid size is 30cm X 30cm. 7. The Rhombus type high tension wire rope net according to claim 6, wherein the transverse tension cable 310 and the longitudinal tension cable 320 are selected from a high tension wire rope having a diameter of 12 mm or 14 mm or 16 mm or 18 mm. Slope reinforcement method using panel 8. The aluminum according to any one of claims 5 to 7, wherein the aluminum and zinc (Al / Zn) alloy layers of general strength are integrated on the outer surface after minimizing the formation of the zinc layer on the steel wire. (95% Zn + 5% Al) is added to the corrosion resistance plating layer is formed on the Rhombus type high tension wire rope net panel 200 and the transverse tension cable 310 and the longitudinal tension cable 320 Slope reinforcement method using Rhombus type high tension wire rope net panel

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