JP4630851B2 - Anchor for slope - Google Patents

Description

  The present invention relates to a slope anchor suitable for a suspended avalanche prevention facility and the like.

  Civil engineering facilities on slopes, for example, avalanche prevention facilities, include those with main pillars and columns fixed to concrete foundations, and those with suspension types. In other words, struts are arranged at intervals and a wire rope is connected to a fence body or triangular pyramid frame in which cross beams are fixed in a multi-stage shape, and the wire rope is guided upward on the slope, and the top of the slope (head) is It is supported and fixed with a cement anchor made of pipe anchor or deformed reinforcing bar driven into the ground.

However, since the prior art is a pile foundation that casts anchor material into the soil, a special heavy equipment installation machine is required, and it is difficult to move at high slopes. It costs a lot of money and the construction period is long. In addition, since the anchor material is placed in the soil, the yield strength is determined by the soil condition, and the efficiency may not be expected even if a rigid anchor material is used depending on the form of the ground. In addition, since it is a rule to provide an anchor for each base of the suspension structure, the number of anchors provided when there are a large number of suspension structures increases, which also affects the construction period and cost.
Japanese Patent No. 2787422

  The present invention has been made in order to solve the above-described problems, and the object of the present invention is an economical aspect that can achieve high yield strength with simple work regardless of the underground geology. It is to provide a high strength anchor for use.

  In order to achieve the above object, the present invention provides an anchor installed at a high position on a slope for suspending a lower structure, the anchor having a long member for suspension along a lower edge, The present invention is characterized by comprising a thick wire mesh that is bitten and laid on the ground surface of the construction site, and a fastening member that penetrates the mesh of the thick wire mesh and is driven into the ground.

  The present invention uses a thick wire mesh instead of a pile as an anchor body, and can effectively apply initial tension by utilizing the weight of a long member for suspension attached along the lower edge region of the thick wire mesh. By making use of the thickness of the wire mesh that is easy to adjust to the undulations of the natural ground, it is possible to bite the rhombus into the ground surface without gaps. Since the strength becomes the anchor strength, the anchor can be stable and have high yield strength.

In addition, since the long member for suspension is attached along the lower edge of the wire mesh, the wire rope for suspension of the structure can be connected to an arbitrary position, and the load of the structure is distributed and received by the wire mesh. Since it can be provided, a highly stable suspension structure can be obtained.
In addition, it is easy to carry into the construction site, and the fastening member does not require proof stress, and it can be constructed without the need for a special tool because it can be used with a temporary fastening function during laying. Since it has a length corresponding to the width of the wire mesh, it is possible to suspend a plurality of structures with a single anchor, coupled with the ability to distribute and support the load of the suspension rope and structure. Simplify construction and perform efficiently in a short period of time.

  Preferably, the long member for suspension is a pipe. According to this, it is easy to carry to the site, and the weight can be adjusted by filling the inside with a heavy object, so that it is possible to effectively apply the desired tension for biting into the natural ground. it can.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 4 show an embodiment of a slope anchor according to the present invention. Reference numeral 1 denotes an entire anchor according to the present invention, and a thick metal mesh 2 having corrosion resistance and a lower edge of the thick metal mesh 2. And a plurality of fastening members 4 driven into the ground to fasten at least the upper edge region of the thick metal mesh 2 to the ground.

The thick wire mesh 2 has a flexibility that is easy to adjust to the ups and downs of natural ground, and has a specification that the rhombus can penetrate into the soil well. For example, the wire diameter is 3.2 to 5.0 mm. The shape of the eyes is rhombus, and the mesh (w × h) is knitted to about w: 46 to 50 × h: 50.
In order to obtain corrosion resistance, the thick wire mesh 2 is plated with zinc, zinc aluminum alloy, or the like on the surface of the wire 200, or further coated with a resin, preferably a saturated polyester synthetic resin with an isophthalic acid content of 8 to What is equipped with the powder coating film | membrane of the isoterephthalic acid copolymerization saturated polyester containing 20 mol% and intrinsic viscosity of 0.7-1.0 is used.

With this construction, double corrosion protection is achieved by anti-corrosion plating and resin coating, so that durability can be improved, and the coating film of isoterephthalic acid copolymerized saturated polyester has good weather resistance and is coated. Even if the film is strong and the rhombus is widened, the coating does not peel off from the background of the wire, and the adhesion strength reaches 3 to 5 times that of the epoxy resin, so that even when the net is bent, the coating surface is cracked. It does not occur and has excellent durability. In addition, since a desired color tone can be obtained by blending a pigment into the resin powder, a wire mesh that does not stand out can be obtained.

The thick metal mesh 2 is usually in the shape of a rectangular plane, and is installed from the slope head where the suspension structure is to be placed to the shoulder. Since the design strength is calculated by the wire diameter and the number of intersections, the area is set according to the weight and number of structures and wire ropes to be suspended, the angle of the ground to be laid, etc. It can be said that about 10 m ² is necessary.

In the present invention, the long elongating member 3 functions as a weight when initial tension is applied to cover the thick metal mesh 2 serving as an anchor body on the ground and allow the diamond to bite into the ground. In the state, it fulfills the function of connecting and supporting the wire rope that suspends the structure, and the function of distributing the load of the structure and the wire rope to transmit to the thick metal mesh 2.

The long member 3 needs to have corrosion resistance, and in addition to steel, stainless steel, etc., those subjected to plating and powder coating are selected. Moreover, since it is required that the strength is sufficient, a tube used as a beam or a column, such as a steel bar or a section steel, may be used. It is easy to convey because it is hollow, and by adding a filler with a large specific gravity, such as earth, sand, water, mortar, etc., the weight increases, and when applying initial tension, the rhizome is in the ground. It is because it can make it easy to bite. In the case of water, it is easy to plug the end of the tube and fill it, remove the plug after applying the initial tension, and drain it.

The long member 3 may be one piece over the entire length of the thick metal mesh 2, but may be rigidly joined to those divided into a plurality of pieces. In any case, it is arranged on the upper surface side or the lower surface side of the thick wire mesh 2, and a high-corrosion-resistant joint fitting, for example, the coupling coil 5 is attached so as to sew the rhombus 20 of the thick wire mesh 2 as shown in FIGS. It is attached.
The fastening member 4 is a so-called temporary fixing means for preventing the displacement when the initial tension is applied to the thick metal mesh 2, and it can be said that the load burden as an anchor is zero. Therefore, the fastening member 4 is not a pipe anchor or the like that functions as a pile foundation, but a pin having a U-shaped or ten-handed bent portion 40 that has a diameter of about 8 to 15 mm and that engages the diamond of the thick metal mesh 2 at the upper end. Is enough.

4 and 5 show an example in which the anchor of the present invention is applied to an avalanche prevention fence anchor.
Reference numeral 6 denotes an avalanche prevention fence as a suspended structure, which is constructed by laying beam members 61 in multiple stages on a plurality of support columns 60 which are arranged at intervals and connected to each other by stays 62, and are suspended from the back base of the support columns. The rope 7 is connected and extended, and the tip of the diagonal rope 7a connected to the upper rear part of the support is connected in the middle of this.
As the suspension rope 7 and the diagonal rope 7a, those having corrosion resistance are used. For corrosion resistance, the same specifications as those for the thick wire mesh 2 are suitable.

Here, the anchor 1 of the present invention is arranged in the natural area a from the top area of the slope A, that is, from the head A1 to the shoulder A2. From the shoulder A2 is a slope A3 with a strong gradient. The natural ground a is better if it is horizontal, but may have a gradient of about 20 degrees. In any case, however, the thick metal mesh 2 needs to have a length that the beam-like member 3 reaches the portion of the shoulder A2.

In the anchor installation work, at least the upper edge portion of the thick metal mesh 2 is fastened to the natural ground a by the fastening member 4 at regular intervals, for example, every 2 m before dropping the thick metal mesh 2 over the shoulder A2. When the fastening member 4 is a pin, a construction tool such as a large hammer is sufficient, and the work is simple and can be performed quickly.

In this way, with the thick metal mesh 2 temporarily fixed, the thick metal mesh 2 is extended to the natural ground a, and the long member 3 at the lower edge is lowered to the shoulder A2. If necessary, the fastening member 4 is further driven into a necessary place to suppress the floating. As a result, initial tension is given by the traction action due to the weight of the thick metal mesh 2 and the weight of the long member 3, and the thick metal mesh 2 adheres following the undulations of the ground surface of the natural ground a as shown in FIG. 20 bites into the surface soil. As a result, a large frictional force is generated, and the strength of the intersection of the meshes constituting the rhombus becomes the proof stress.

Next, the upper end of the suspension rope 7 is connected to the long member 3. The connecting means and method are arbitrary, but since the long member 3 is attached to the thick metal mesh 2 in advance, when an eye is provided in advance at the end of the suspension rope 7, the longitudinal direction of the long member Will have to pass through.
Therefore, as shown in FIG. 6, a winding grip 8 in which steel wires are drawn in parallel so as to form a band, processed into a spiral shape, and an inner surface is coated with a friction agent is suitable. In this case, the U-turn portion 80 of the hairpin-shaped winding grip 8 is joined to a desired portion of the long member 3 corresponding to the position where the hairpin is to be suspended, and the foot portions 81 and 81 are tightly attached to the end portion of the suspension rope 7. The work is easy because it only has to be tightened. In addition, when there is anxiety about the shift | offset | difference of the right and left of a connection part, what is necessary is just to attach a stopper means to the beam-shaped member 3 corresponded on the right and left of the eye of a suspension rope.

Thus, the suspension rope 7 having the terminal connected to the long member 3 is connected to the avalanche prevention fence 6 disposed on the slope A3. This completes the installation. By doing so, the load of the avalanche prevention fence 6 and the load of the suspension rope 7 are applied to the long member 3, and since this long member 3 is in the area of the shoulder A2, the heavy metal mesh 2 is pressed more strongly against the ground. As shown in Fig. 5, the rhombus digs into the soil without any gaps. As a result, a stronger frictional force is created in the thick metal mesh 2 and the ground mountain a, and a high proof stress is generated. Since it can be constructed without being affected by the soil quality of the ground mountain a, it is significantly simpler and more efficient than the pile foundation type in which the main anchor is driven.

  Since the long member 3 has a length difference along the width of the thick wire mesh 2, the load from the suspension rope 7 is dispersed by the long member 3, and thus the thick wire mesh 2 is locally extended. Does not occur, and the avalanche prevention fence 6 is stably suspended. Further, when an additional load is applied to the avalanche prevention fence 6 due to snow accumulation, the biting of the thick metal mesh 2 into the ground is further promoted, and the proof stress is stabilized as the years pass. In addition, because it is a wire mesh, trees are nurtured through the rhombus, which further stabilizes the yield strength.

In the present invention, a rigid long member 3 is provided at the lower edge portion of the thick metal mesh 2, and the load of the suspension rope 7 can be dispersed by this. Therefore, as shown in FIG. It can be suspended and is economical.

The present invention is applicable not only to the wall-shaped avalanche prevention fence shown in the figure but also to the avalanche prevention fence made of a triangular pyramid-shaped frame. It is also applied to a rock fall prevention net. In that case, the vertical rope is connected to the elongated member 3 or further extended and connected to the upper edge of the thick metal mesh 2. According to this, even on a slope having a gradient of 90 degrees and a straight height exceeding 250 m, construction can be performed economically and simply without using a pile-type anchor.
Moreover, since the anchor of the present invention can be applied to a site where the topography is horizontal or has a weak slope, it is not limited to the top of the slope, but is also effective as an anchor in cuts provided in the middle of the slope. In other words, it is sufficient to lay the thick wire mesh 2 so that the long member 3 is positioned on the shoulder of the cut and dig into the ground surface portion. By supporting the rope of the suspended structure on the long member 3, the anchor with high strength can be obtained. Easy installation.

1 is a perspective view of an anchor according to the present invention. FIG. 2 is an enlarged front view of a circled portion in FIG. 1. It is sectional drawing which follows the XX line of FIG. It is a perspective view which shows the example of application. (A) is the expanded sectional view of the part enclosed with the circle | round | yen of FIG. 4, (b) is the side view. It is a side view which shows the connection of the beam-shaped member and suspension rope in this invention. It is a front view which shows the other example of application of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 This invention anchor 2 Thick metal mesh 3 Long member for suspension 4 Fastening member 6 Structure 7 Suspension rope

Claims (2)

  An anchor installed at a high level on the slope to suspend the structure underneath, the anchor has a long member for suspension along the lower edge, and is bitten and laid on the ground surface of the construction site. A slope anchor comprising: a thick metal mesh; and a fastening member that penetrates the mesh of the thick metal mesh and is driven into the ground.   The slope anchor according to claim 1, wherein the long member for suspension is a pipe.

Images