JP2008180069A - Square gabion - Google Patents

Abstract

Disclosed is a gabion that has no risk of elution of harmful substances such as zinc, has excellent corrosion resistance and durability, and is difficult to slip.
A square gabion 1 having a bottom mesh 2, four side meshes 3, 4, 5, 6 and a lid mesh 7, wherein the bottom mesh, the side mesh and the lid mesh are all made of stainless steel. It is made of a wire mesh, and at least the stainless steel wire of the bottom mesh, the side mesh, and the lid mesh is subjected to concavo-convex treatment by blasting to have a rough surface of 50 to 200 μm expressed by Rz according to JISB0601.
[Selection] Figure 1

Description

  The present invention relates to a wire mesh basket, particularly a square gabion, which is filled with cobblestones, chestnut stones, quarry stones, etc., used in civil engineering work such as river / coast revetment, roads, slope formation and the like.

In the old days, bamboo was used for these jars, and as time passed, the soil filled between the stones, and at the same time, the bamboo was eroded and the natural terrain was formed. However, due to the recent difficulty in obtaining bamboo materials and the increasing complexity of the landform of the formation, it has become necessary to increase the size of the cocoon and prolong its life. For this reason, gabion using an iron wire net plated with zinc or zinc aluminum alloy having excellent corrosion resistance is used as described in, for example, Patent Document 1. However, with this gabion, zinc flows out over time, and there are concerns about adverse effects on the soil and river water environment.
JP 2004-204626 A (paragraph number 0017)

  An object of the present invention is to provide a gabion having excellent corrosion resistance and durability without removing the problems of the gabion made of metal wire and having no fear of elution of harmful substances such as zinc.

  That is, according to the present invention, in a square gabion having a bottom mesh, four side meshes, and a lid mesh, the bottom mesh, the side mesh, and the lid mesh are all made of a stainless steel wire rhombus, and at least the stainless steel wire of the lid mesh is It is a square gabion characterized by having a rough surface that has been roughened by blasting.

Hereinafter, the present invention will be described in detail with reference to examples.
The square gabion according to the present invention is basically composed of a rectangular bottom mesh, four side meshes, and a lid mesh, and has a rectangular parallelepiped shape. Each of the bottom mesh, the side mesh, and the lid mesh is made into a diamond wire mesh using a stainless steel wire. (This stainless steel wire may hereinafter be referred to as a stainless steel mesh wire.) The rhombus wire mesh is a wire mesh in which the mesh is knitted in a diamond shape as defined in JIS G3552. JIS standard stainless steel is used as the material of this stainless steel wire, and SUS430 (18 Cr), SUS304 (18 Cr-8 Ni) or SUS305 (18Cr-10Ni) is particularly preferred because it is easy to process. SUS304 (18 Cr-8 Ni) is particularly preferably used because of its property and cost.

  A frame line is provided at a position corresponding to a ridge of the rectangular gabion, forming a skeleton of the square gabion. A frame line provided at the boundary between the bottom net, the side net, and the lid net, a binding line such as a coupling coil that joins adjacent nets to form a coffin, and two opposing side nets for strengthening the coffin The stainless steel wire is also used for the beam wire that may be provided between the two.

  The surface of the stainless steel mesh wire constituting the lid net has a rough surface that has been concavo-convexly processed by blasting. By making the surface of the stainless steel wire of the lid mesh rough, the risk of slipping the foot when an operator or pedestrian walks on it after installing a square gabion packed with cobblestone etc. on the construction site is reduced. To do. If the surface roughness of the stainless steel wire is too large, the mechanical strength and durability of the stainless steel wire will decrease. Conversely, if the surface roughness is too small, the effect of preventing slipping of the foot will be lost. Is preferably represented by Rz according to JIS B0601 and has a roughness of 50 to 200 μm, more preferably 75 to 150 μm. Similarly, it is preferable that the surface of the lid mesh frame line and the binding wire is also roughened. The stainless steel wires other than the lid mesh (bottom mesh, side mesh) may be similarly roughened.

  Shot blasting or air blasting is used as the blasting, and shot blasting is particularly preferably used in consideration of efficiency. The roughness of the resulting rough surface can be controlled by setting the material of the abrasive (sand, cast iron particles, cast steel particles, etc.), the particle size of the abrasive, the projection speed (or air wind speed), etc. . The time of blasting can be any of (1) wire rod stage before net making, (2) after net making and before assembling the hook, and (3) after assembling the hook. Considering the efficiency, it is preferable to (1) perform blasting at the wire rod stage before netting.

  In order to perform shot blasting of a stainless steel wire at the wire rod stage before making the net, for example, as described in Japanese Patent Application Laid-Open No. 07-23447, the stainless steel wire is advanced in the length direction while the stainless steel wire is moved. This is performed by projecting the abrasive by arranging a plurality of impellers for projecting the abrasive material in the circumferential direction so as to be displaced in the direction of the traveling line.

  In the present invention, the bottom mesh, the side mesh, and the lid mesh are made into a rhombus wire mesh using a stainless steel wire, and these meshes use a stainless steel wire having a diameter of 3.0 to 5.0 mm, The mesh is made so that the mesh size (distance on one side of the mesh space) is 40 to 130 mm, preferably 60 to 100 mm. When the square gabion of the present invention is used in a flat manner, it is possible to use a lid mesh having a smaller mesh size than the mesh size of the bottom mesh and the side mesh in order to increase the mechanical strength. preferable. Furthermore, it may be preferable to use a stainless steel wire with a diameter larger than the diameter of the stainless steel wire of the bottom mesh and the side mesh. When the square gabion according to the present invention is used in multi-stage stacking, not only the lid mesh but also the side mesh (front straight mesh) which becomes the surface of the slope is smaller than the bottom mesh (and larger lines). It is preferable to have a diameter).

The stainless steel wire has a large tensile strength than zinc aluminum alloy coated iron wire, such as stainless wire SUS304 versus about 290 N / mm ² or more tensile strength with the zinc aluminum alloy coated iron wire about 710N / mm ² or more tensile strength Have Therefore, a stainless steel wire having a diameter smaller than the diameter of the conventional zinc aluminum alloy plated iron wire is used, for example, 3.2 mm with respect to a conventional zinc aluminum alloy plated iron wire having a diameter of 4.0 mm (or 5.0 mm). A stainless steel wire with a diameter of (or 4.0 mm) is used.

  Blasted stainless steel wire has higher hardness than stainless steel wire without this processing. Therefore, when making a net, it is necessary to set the dimensions suitable for it as a part of the net making machine (jiru, spatula). is there. It should also be noted that the blasted stainless steel wire is much harder than the non-worked wire and the general iron wire at the stage of assembling the cage.

According to the square gabion of the present invention, there is no fear of harmful zinc outflow as compared with the conventional gabion, and environmental protection that is gentle to nature can be performed. In addition, there is little risk of slipping when performing construction using the square gabion according to the present invention or walking on it after construction.
Furthermore, since the square gabion of the present invention is excellent in corrosion resistance and durability, the performance can be maintained for a long period of time as compared to the conventional one, and acid rivers, tidal rivers, It can also be applied to the impact section.

The embodiment of the present invention will be specifically described below with reference to examples.
1 and 2 are a perspective view and a development view of a first embodiment of the square gabion according to the present invention. A rectangular parallelepiped gabion 1 includes a bottom net 2, left and right side nets 3 and 4, front and rear side nets 5 and 6, and a lid net 7, and has dimensions of length L, width W, and height D. Have. Each mesh is formed of a rhombus wire mesh knitted with a stainless steel wire (SUS304). As shown in FIG. 3 disassembled and displayed in each mesh, stainless steel wires (SUS304) are provided at adjacent boundaries of the bottom mesh 2, left and right side meshes 3 and 4, front and rear side meshes 5 and 6, and lid mesh 7, respectively. Frame lines 8 to 21 are provided, and the ends of the wire mesh lines are folded or twisted at the frame lines.

  Coil so as to surround each frame of two adjacent nets using a coupling coil formed in the shape of a spiral rod having a diameter of 50 mm, a spiral interval of about 50 mm, and a length of 450 mm by winding a stainless steel wire (SUS304) with a diameter of 3.2 mm. Adjacent nets can be joined by rotating and winding the coil.

  For example, the gabion is assembled in the following order. As shown in FIG. 3, the bottom net 2 and the front and rear side nets 5 and 6 are connected via frame lines 15 and 16. Frame lines 18, 19, 20, and 21 are provided on the four circumferences of the lid net 7, and the front and rear side nets 6 and the lid net 7 are coupled by the frame line 18. In addition, frame lines 8, 9, 10, 11 and 12, 13, 14, 15 are provided on the four circumferences of the front and rear side nets 5, 6, respectively. The frame lines provided at the boundaries of the meshes or at the edges of the meshes are joined by folding back or twisting the stainless steel mesh lines at the frame lines. Alternatively, the guide lines at both edges in the traveling direction of the net can be used as a frame line at the net making stage, and the frame line can be inserted into the center of the net during or after the net making stage. it can.

  These nets are transported to the construction site and placed at predetermined installation locations, and the left and right side nets 3 and 4 and the front and rear side nets 5 and 6 are erected so as to be perpendicular to the surface of the bottom net 2 and The stainless steel mesh wires of the edges 23, 24, 25, and 26 of the meshes 5 and 6 are folded or twisted at the frame lines 11, 13, 15, and 9 of the left and right side meshes 3 and 4, respectively. The gabion 1 is assembled with the side nets 3 and 4 and the front and rear side nets 5 and 6. Next, a stone is filled therein, and then the lid net 7 is placed thereon, and then the coupling coil is rotated so as to surround the two border lines of the border line 20 of the lid mesh 7 and the border line 14 of the side net 4. Similarly, the frame line 21 of the lid net 7 and the frame line 18 of the side net 5 and the frame line 22 of the lid net 7 and the frame line 10 of the side net 3 are coupled using a coupling coil. Each end of each frame line and each end of the adjacent frame line are connected by welding or bending.

  Although the above has described the case where gabions are installed alone, in practice, a plurality of gabions are usually arranged side by side. In this case, since the left and right side nets (or front and rear side nets) of adjacent gabions overlap, one of them can be omitted. At the construction site, for example, two adjacent bottom nets and one left and right side nets (or front and rear side nets) are coupled by rotating a coupling coil so as to surround a total of three frame lines at each edge. Similarly, two adjacent lid nets and one left and right side face nets (or front and rear side face nets) are coupled by rotating the coupling coil so as to surround a total of three frame lines at each edge.

  Table 1 shows the specifications of a square gabion suitable for flat tension in which a large number of gabions are arranged in a plane. The mesh size (mm mesh) is represented by the distance of one side of the rhombus space of the rhombus wire mesh.

Table 1
Dimensions of square gabion L = 2000mm, W = 1500mm, D = 500mm
Bottom net Left and right side net Front and rear side net Lid mesh wire diameter 3.2mm 3.2mm 3.2mm 3.2mm
Wire mesh 100mm 100mm 100mm 65mm 65mm Border diameter 4.0mm 4.0mm 4.0mm 4.0mm

  The stainless steel wire rod and the stainless steel frame wire for the lid net were previously subjected to shot blasting using a steel ball shot having a particle diameter of 0.75 mm, and the surface roughness Rz of the wire material and the frame wire was about 80 μm. For the difficulty of slipping of the roughened stainless steel wire, the friction coefficient value was measured using a surface friction test apparatus. The surface friction test apparatus consists of a horizontal test table having a size of 1.5 m × 1.5 m, a sliding piece, and a driving mechanism that generates relative movement between the sliding piece and the test table. The sliding piece has a rectangular bottom surface with a long side of 30 cm and a short side of 15 cm and a mass of about 30 kg, and the bottom surface is covered with rubber defined in JIS T8101. A load cell is provided between the sliding piece and the drive mechanism, and the tensile force is recorded by an electrical data processor. A lid mesh having a size of 1.1 m × 1.1 m as a test piece is fixed on the test table, and a sliding piece is placed on the center upper surface of the test piece and connected to the load cell. Water is sprayed on the test piece lid so that the surface gets wet immediately before the sliding piece starts to move. After spraying water, the drive mechanism is operated to move the sliding piece at about 100 mm per minute to start recording. The maximum stress (static friction force) obtained first is measured. The static friction coefficient μs is calculated as a value obtained by dividing the value (N) of the static friction force by the value (300 N) of the normal force generated by the mass of the sliding piece. If the static friction coefficient when spraying water is 0.8 or more, it is determined that there is an effect of preventing slipping of the foot.

  The static friction coefficient value μs measured and calculated for the lid net was 0.8. The coefficient of static friction μs when water was not sprayed was 1.15. Moreover, the water-spraying friction coefficient value for the stainless steel cover net not subjected to roughening was 0.1, and the friction coefficient value without water spraying was 0.3.

  The embodiment in the case where the gabions are flattened has been described above. However, in the case of Example 2 where the gabions are stacked in multiple stages, one of the front and rear side nets of the gabions is exposed to the outside. As shown in FIG. 2, it is preferable to make the mesh of the front and back side mesh fine. The rough surface processing of the lid net was performed in the same manner as in Example 1. The surface roughness Rz and the coefficient of friction of the stainless steel wire were the same as in Example 1.

Table 2
Dimensions of square gabion L = 2000mm, W = 1000mm, D = 500mm
Bottom net Left and right side net Front and rear side net Lid mesh wire diameter 3.2mm 3.2mm 3.2mm 3.2mm
Wire mesh mesh 100mm eyes 100mm eyes 65mm eyes 65mm eyes Border diameter 4.0mm 4.0mm 4.0mm 4.0mm

The perspective view which shows the Example of this invention. The expanded view which shows the Example of this invention. The exploded view of the Example of this invention.

Explanation of symbols

1 .. Gabion 2 .. Bottom net 3, 4. Left and right side net 5,. Front and rear side net 7.. Lid 8, 9, 10, 11, 12, 13, 14, 15. Frame lines 16, 17.. Frame lines 19 between the bottom mesh and the front and rear side networks... Frame lines 20, 21, 22 between the cover nets and the front and rear side networks.

Claims (4)

  In a square gabion having a bottom mesh, four side meshes, and a lid mesh, the bottom mesh, the side mesh and the lid mesh are all made of a stainless steel wire rhombus, and at least the stainless steel wire of the lid mesh is processed by blasting. A square gabion characterized by having a roughened surface.   2. The square gabion according to claim 1, wherein the rough surface has a roughness of 50 to 200 μm represented by Rz according to JISB0601.   2. The square gabion according to claim 1, wherein the rough surface has a roughness of 75 to 150 μm represented by Rz according to JISB0601.   The square gabion according to any one of claims 1 to 3, wherein the stainless steel wire has a composition of SUS430, SUS304, or SUS305.

Images