Net tube member and method for forming net tube

Abstract

To provide a net cylinder member which can be transported by stacking and can easily form a net cylinder on site. [Solution] A mesh tube member consisting of a rectangular mesh body when viewed from above, which is bent or curved into an open shape at the top, and which is symmetrical about a horizontal center line, and which has a V-shaped cross-sectional notch on the underside of some or all of the multiple wires located on the center line.

Description

[Technical field]

[0001] The present invention relates to a net cylinder member that serves as a net cylinder used to form anchor holes in a spray frame construction method, and a method for forming a net cylinder. [Background technology]

[0002] The Free Frame Method (registered trademark) is a widely used spray-type frame construction method for constructing a framework by spraying mortar to protect and stabilize slopes. This method involves assembling reinforcing bars in a formwork formed by arranging mesh bodies in parallel, pouring mortar into the formwork using a spray-type method, and constructing a grid-like framework made of mortar. One of the features of the free frame method is that by forming the formwork from a mesh, rebound is eliminated (discharged) from the mesh when mortar is sprayed, making it possible to construct a high-strength framework using uniformly sprayed mortar. In the construction method for constructing such crenellation framework, when anchors such as ground anchors or rock bolts are used, a box-punched pipe is placed in the center of the lattice intersection and mortar is sprayed to form the anchor hole.

[0003] Two types of box-out pipes are often used: PVC pipes or void pipes. However, these pipes all have a smooth curved surface, and are therefore ineffective at eliminating rebound when spraying mortar. In particular, the center of the lattice intersection is densely packed with main anchors for fixing the formwork to the slope, rebars, and additional rebars and wires for fixing the box-punched pipes, making it difficult for rebound to be removed. As a result, rebound remains on the box-punched pipes, which can lead to the mortar not being uniform or to cavities being formed.

[0004] On the other hand, it is known that when a mesh tube made by bending wire mesh or the like is used as a box-punching pipe, the mesh eliminates rebound, allowing the intersections of the lattice of the crenellation frame to be constructed with uniform mortar, eliminating the risk of cavities forming. Patent Documents 1 and 2 describe a technique in which a mesh tube is used as a box-punched pipe. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 01-299917 [Patent Document 2] Patent No. 7472387 Summary of the Invention [Problem to be solved by the invention]

[0006] The mesh cylinder in Patent Document 1 is a cylindrical body. The cylindrical mesh tubes could not be formed on-site, so they were formed into cylindrical shapes at factories. However, because the cylindrical bodies could not be stacked, they were bulky when transported from the factory to the site, and transportation costs were high.

[0007] The mesh tube in Patent Document 2 is described as being formed not only as a cylinder, but also by combining two U-shaped meshes made by bending crimped wire mesh into an approximately U shape on site to form an approximately hexagonal shape when viewed in plan. However, because crimped wire mesh is made by combining corrugated wire rods, adjacent wire rods have different corrugations (when one has a peak, the other has a valley), so when the wire is bent, the lengths of the ends become uneven, making it difficult to assemble on site.

[0008] The present invention has been made in consideration of the above points, and its object is to solve the above problems and provide a net tube member and a method for forming a net tube that can be stacked and transported, and that can easily form a net tube on site. [Means for solving the problem]

[0009] The mesh tube member of the present invention consists of a rectangular mesh body when viewed from above, which is bent or curved into an open shape at the top, and which is symmetrical about a horizontal center line, and which has a V-shaped cross-sectional notch on the underside of some or all of the multiple wire rods located on the center line. The shape may be a generally V-shape, a generally U-shape, or a semicircle on either side of the center line.

[0010] In addition, the method for forming a mesh tube of the present invention involves forming a V-shaped cross-sectional notch in some or all of the multiple wire rods located on the horizontal center line of a rectangular mesh body when viewed from above, forming a mesh tube member that is bent or curved symmetrically about the center line with the surface with the notch as the underside, and has an open upper shape, and folding the mesh tube member along the center line to form a tube shape. The shape may be a generally V-shape, a generally U-shape, or a semicircle on either side of the center line. Effect of the Invention

[0011] The present invention provides at least one of the following effects. (1) Since the wire mesh of the mesh tube component is connected along the center line, it can be stacked and transported to the site, so it does not take up much space and transportation costs can be reduced. (2) The mesh tube components are connected along the center line to form a single unit, so there is only one part required for transportation to the site, making management easy. (3) The mesh tube member has a notch along the center line, so that it can be easily bent by hand at the site to form a mesh tube. (4) By notching some of the intersections and leaving them as connecting parts, the shape of the mesh tube can be maintained even if it breaks at the cutout when bending it on site. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view of a frame using a mesh cylinder made of the mesh cylinder member of the present invention; [Diagram 2] FIG. 1 is a perspective view of a mesh cylinder made of a mesh cylinder member of the present invention; [Diagram 3]An explanatory diagram of the method for forming the mesh cylinder of the present invention (1) [Figure 4] Enlarged view of part of Figure 3 [Diagram 5] An explanatory diagram of the method for forming the mesh cylinder of the present invention (2) [Figure 6] An explanatory diagram of the method for forming the mesh cylinder of the present invention (3) [Figure 7] FIG. 1 is an explanatory diagram of a cutout and a connection part of a mesh tube made of a mesh tube member of the present invention. [Figure 8] FIG. 11 is an explanatory diagram of a mesh tube member according to a second embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the net cylinder member and the method for forming the net cylinder of the present invention will be described in detail with reference to the drawings.

[0014] [Example 1] <1> Overall legal framework The mesh cylinder 1 in the present invention is disposed at the intersection of the crenellation 2 and is used as a box-punched pipe for forming the anchor holes 6. The slope frame 2 is installed on the slope to stabilize it, and has a frame body 3 consisting of a pair of wire meshes 31 arranged in a lattice pattern on the slope facing each other, and reinforcing bars 4 arranged inside the frame body 3. Mortar 5 is poured inside the frame body 3 and allowed to harden. Then, mesh tubes 1 are placed at the intersections of the lattice of the slope frame 2 inside the frame body 3 (Fig. 1). The reinforcing bars 4 are arranged, for example, by being fixed to connecting members (not shown) arranged across the wire meshes 31 arranged opposite each other with steel wires or the like. The mortar 5 is sprayed into the frame 3 containing the reinforcing bars 4 by a conventionally known spraying method and allowed to harden.

[0015] <2> mesh tube The mesh cylinder 1 is a hexagonal prism-shaped member having mesh 11 on its circumferential surface (FIG. 2), and its height is approximately the same as that of the wire mesh 31 of the frame 3. The mesh cylinder 1 is formed into a cylindrical shape by folding a mesh body such as a flat lath mesh, welded wire mesh, crimped wire mesh, expanded metal, or a perforated plate. Because the mesh cylinder 1 has mesh 11, the mortar 5 sprayed onto the mesh 11 penetrates into the inside of the mesh cylinder 1 and becomes one with the crest 2. In addition, the rebound generated when the mortar 5 is sprayed is eliminated by the mesh 11, eliminating hollow spaces and resulting in a structure in which the rebound accumulates inside the mesh cylinder 1. By eliminating hollow spaces, spring water or rainwater will not penetrate into the hollow spaces and corrode the reinforcing bars 4. Furthermore, because rebound is eliminated, the intersections of the lattice of the crest 2 can be constructed with uniform mortar 5. In particular, the intersections of the lattice are important points where the main anchors and reinforcing bars 4 are concentrated, and by making the mortar 5 uniform, strength can be maintained.

[0016] <3> Method of forming the mesh tube The mesh cylinder 1 of the present invention is formed by the following procedure.

[0017] <3.1> Formation of notch A V-shaped notch C is made in the wire located on the lateral center line L of the rectangular mesh material 1a in plan view (Figs. 3 and 4). The mesh material 1a in this embodiment is a lath mesh, and the center line L is aligned with the intersection of the wires that make up the wire mesh, and the notch C is formed at the intersection. At this time, the notches C may be provided at all the intersections, or as in this embodiment, some of the intersections may not be provided with the notches C and may be left as connecting portions 12.

[0018] <3.2> Formation of the mesh tube member After providing a notch C along the center line L, pressing is performed symmetrically with respect to the center line L to form the mesh tube member 1b in which two approximately U-shaped wire meshes are on both sides of the center line L and connected along the center line L. At this time, the notch C is positioned on the surface below the center line L with respect to the approximately U-shape to be formed, and by bending along the center line L in the direction of the notch C, the approximately U-shaped wire mesh has a shape that opens upward. The net cylinder member 1b is delivered to the site, but since the net cylinder member 1b of the present invention is a state in which the roughly U-shaped wire mesh is connected along the center line L, it can be transported to the site by stacking them, which makes it less bulky and reduces transportation costs. In addition, since it is connected along the center line L and integrated, the number of parts when transporting to the site is reduced to one, making management easy.

[0019] <3.3> On-site formation The mesh cylinder member 1b is transported to the site and bent at the site along the center line L to form the hexagonal prism-shaped mesh cylinder 1. Since the notch C is located on the lower surface of the center line L with respect to the approximate U-shape before bending, it is located on the outer surface of the hexagonal prism after bending. The mesh tube member 1b has a notch C formed along the center line L, so that it can be easily bent manually on site. Furthermore, by not providing notches C at some of the intersections but leaving them as connecting parts 12, even if the notch C breaks when bending on-site, the connecting parts 12 will not break and the hexagonal column shape can be maintained.

[0020] [Example 2] <1> Shape of the mesh tube In the above-mentioned first embodiment, the mesh cylinder 1 is in the shape of a hexagonal prism, but it may also be in the shape of a cylinder or a square prism. When the mesh tube member 1b is formed into a cylindrical shape, it is formed by pressing on both sides of the center line L into a semicircular shape that is line-symmetrical with respect to the center line L (FIG. 9). When the mesh tube member 1b is formed into a square prism shape, it is formed by pressing on both sides of the center line L into a substantially V-shape that is line-symmetrical with respect to the center line L (FIG. 9). Regardless of the shape of the mesh cylinder member 1b, it can be transported to the site by stacking them together, so that it is not bulky and transportation costs can be reduced. [Explanation of symbols]

[0021] 1 mesh tube, 11 mesh, L center line, C notch 1a Net body, 1b Net tube member 2. Legal Framework 3 frame, 31 wire mesh 4. Steel Bars 5. Mortar 6 Anchor holes

Claims

1. It consists of a rectangular mesh body when viewed from above, The upper portion is folded or curved into an open shape, and the shape is symmetrical with respect to a lateral center line; Among the plurality of wire rods located on the center line, a part or all of the wire rods have a V-shaped notch on a lower surface thereof. Mesh tube part.

2. The shape is characterized in that an approximately V-shape, an approximately U-shape, or a semicircle is on both sides of the center line. The mesh tube member according to claim 1 .

3. A V-shaped notch is formed in some or all of the wire rods located on a lateral center line of a rectangular mesh body in a plan view, A mesh tube member is formed with the surface having the notch formed as a lower surface, and is bent or curved symmetrically with respect to the center line to have an open upper portion, The mesh tube member is folded along the center line to form a tube shape. Method of forming a mesh tube.

4. The shape is characterized in that an approximately V-shape, an approximately U-shape, or a semicircle is on both sides of the center line. A method for forming the mesh cylinder according to claim 3.

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