JP2015086672A - Wire-netting fixing device for reinforced soil of slope having long term durability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability of reinforced earth work in which, considering from a point of a slope collapse period having one century or more, the durability should be more than that because the function of the reinforced earth work is lost before the collapse period comes, and to solve a problem of the durability in the fixing place of wire-netting when using the wire-netting.SOLUTION: A wire-netting fixing block 1 with irregularities for fixing the wire-netting on the head of a reinforcing material is invented in order to solve the problem. Also, the height of the block is increased to be more than the thickness of the soil sprayed with vegetation base materials, and thereby head fixing brackets can be isolated from the soil which is easily corroded.

Description

  The present invention relates to reinforced soil applied to slopes.

  When combining the reinforcement earthwork on the slope and the wire mesh, insert the reinforcing material 3 with the spacer 5 attached to the hole 2 having a length of 2 to 6 m perforated with a diameter of 65 to 90 mm as shown in Patent No. 4256545 (see FIG. 6). Then, cement milk 4 is injected into the periphery, and after hardening, the ground and the reinforcing material are integrated, and a wire mesh T7 is sandwiched between the pressure receiving plate T9 and the flexible bag T8, and a curable fluid injection is injected into the bag T8. When the material was injected and the T10 reinforcing material was finally tightened before the curable fluidity injection material was cured and the vegetation base material was sprayed, 13 vegetation base materials were sprayed from above.

Patent No. 4256545

  In the case of Patent Document 1, there is a small gap around the reinforcing material protruding to the ground between which the fluid can move between the ground surface, the bag body, the wire mesh, and the pressure receiving plate. FIG. 7 is an enlarged view of a part of FIG. 6 and the wire mesh of T7 is deleted to make the drawing easy to understand. However, a minute space T14 remains even when the bag body T8 is inflated. Rainwater enters from a minute gap between the pressure receiving plate T9 and the bag body T8, and the head of the reinforcing member 3 as an important member is corroded and easily broken. For this reason, there is a problem that rainwater, seawater splashes, etc. invade and the head of the reinforcing material is easily corroded.

  In addition, since the reinforcing material 3 and the pressure plate T9 are generally used for galvanized products, the durability of galvanized materials is only about 25 years in the coastal area and the soil. Since it has only durability, there is a problem of aging without waiting for several tens of years. Moreover, in the Example of patent document 1, since the net | network is pressed down with the metal pressure-receiving plate from the top, when collapsible soil pushes the metal net | network, the protective layer of a metal net | network is easy to be damaged with a metal edge, and durability. There was a problem.

  On the other hand, reinforced earthworks that prevent the slope from collapsing have a long slope failure period of 100 to several centuries, so in reinforced earthworks that have only a few decades of durability, the slope tends to collapse. At times, there was a problem that the reinforced earthwork was already aging and could not fulfill its function.

  In order to solve the above-described problems, a net fixing block having an unevenness for fixing the net to the head of the reinforcing material has been invented. In addition, the height of the block was made higher than the thickness of the soil sprayed with the vegetation base material, so that the head fixing brackets could be isolated from the soil that was easily corroded.

  Since the reinforcing material head is embedded in the concrete, there is no gap between the net and the concrete or the square washer, so that it is difficult to receive intrusion of rainwater or seawater splash and durability is improved. Moreover, since the net fixing block is thicker than the vegetation base material spraying thickness, the square washer installed on the net fixing block is difficult to be buried in the soil, and durability is improved by being isolated from the corrosive environment. Furthermore, even if a force is applied to the mesh, the edge of the square washer and the wire mesh are less likely to come into contact with each other.

It is a top view which shows the form of a net | network fixed block. It is sectional drawing of a net | network fixed block. FIG. 3 is a plan view of an embodiment where a net fixing block is used. (Example) FIG. 4 is a cross-sectional view of an embodiment of a part using a net fixing block. (Example) FIG. 5 shows an example of the whole construction method using a net fixing block. (Example overall view) FIG. 6 is a cross-sectional view of a prior art reinforcement head. (Overview of the prior art) 6 is an enlarged cross-sectional view of a part near the pressure receiving plate in FIG. 5 (prior art illustration).

  FIGS. 1 and 2 show a plan view and a sectional view of only the mesh fixing block of the present invention, and FIGS. 3 and 4 respectively show a plan view and a sectional view of an embodiment in which a mesh is set on the mesh fixing block. An embodiment of the entire reinforced earth work is shown in FIG. The net fixing block is 10 to 40 cm on a side, and the thickness is 3 cm or more and less than 10 cm thicker than the vegetation substrate spraying. As shown in FIGS. 1 and 2, the net fixing block has a plurality of square frustums 1 ′ protruding from the plane 1, and a hole 1 b into which a reinforcing material enters at the center. The net 7 is set in the recess between the square frustum blocks 1 of the net fixing block, and the kneaded mortar is filled up to the upper surface of the net fixing block. Is done.

  Embodiment of this invention is shown below according to construction order. As shown in FIG. 5, after drilling a hole with a diameter of 42 to 115 mm and a length of 6 m or less in the ground, and filling the ground with cement milk 4, the steel rod 3 with a screw to which the spacer 5 is attached is attached. Inserting or attaching a pipe with a diameter of 15 to 21 mm to the steel rod 3 to the vicinity of the tip and discharging the cement milk 4 from the tip, the cement milk hardens inside the drilled hole, and the reinforcing material 3 and the surroundings The ground is integrated.

  Solid kneaded mortar 6 is filled in the upper part of the hole that cannot be filled with cement milk in order to leak from hole 2. When the mesh fixing block 1 is arranged so that the reinforcing material 3 passes through the hole, and the wire mesh is laid on the entire slope, the mesh 7 is put in the recess between the projection 1 ′ of the mesh fixing block and another projection 1 ′. Then, the kneaded mortar 8 is filled so as to fill the gaps between the protrusions of the net fixing block.

  Before the kneading mortar 8 buried in the gap between the net fixing blocks is cured, the kneading mortar 8 in the net fixing block containing the net is covered with a highly durable square washer 9 coated with fluororesin. Press down. Thereafter, a highly durable screw 10 to which fluorine resin coating or the like is applied is attached to the reinforcing material 3, and the screw 10 and the reinforcing material 3 are fixed.

  Although the reinforcing material 3 has high durability inside concrete such as epoxy resin-coated reinforcing bars, it is generally weak against ultraviolet rays such as sunlight. Therefore, in order to overcome this drawback, the cylinder 11 is covered and solidified mortar 12 Fill.

  After the kneading mortar 8 is cured, the net 7 is fixed to the net fixing block, and the kneading mortar 8 is further pressed by the square washer 9 so that it does not move. Furthermore, after the kneaded mortar 12 is hardened, corrosion of the nut 10 and the reinforcing material 3 is suppressed.

"Effect of the embodiment"
Since the reinforcing material head is embedded in the concrete, there is no gap between the net and the concrete or the square washer, so that it is difficult to receive intrusion of rainwater or seawater splash and durability is improved. Moreover, since the net fixing block is thicker than the vegetation base material spraying thickness, the square washer installed on the net fixing block is hardly buried in the soil and is isolated from the corrosive environment, thereby improving durability. Further, since the edge of the square washer and the wire mesh are less likely to contact, the durability of the wire mesh is improved.
"Other embodiments"
The shape and number of protrusions of the net fixing block are not limited to the shape of a truncated cone, square frustum, triangular pyramid, cylinder, etc., as long as they serve the purpose of fixing the net. The number of protrusions is not limited in view of the size relationship and purpose of the net fixing block.

The solidified mortars 8 and 12 may be other fillers as long as they are curing agents that achieve the purpose. The metal protective film of the square washer 9 and the nut 10 may be other than the fluororesin coat.
The square washer 9 is conventionally called a square washer, but the material is not limited to metal, and may be a material other than metal such as concrete or FRP.
The wire mesh is not limited to metal, but may be made of any material including synthetic resin. The net fixing block includes a case where the net fixing block of FIG. 4 is turned upside down and a protrusion is installed on the ground side.

DESCRIPTION OF SYMBOLS 1 Net fixing block 1 'Protrusion 1b of net fixing block Hole for passing reinforcing material through net fixing block 2 Hole drilled in ground 3 Reinforcing material 4 Cement milk 5 Spacer 6 Solid mortar (Solid mortar Mortar)
7 Wire net 8 Solid kneading mortar
9 Square washer 10 Nut 11 Tube 12 Solid mortar (solid mortar for filling the inside of the tube)

Claims (2)

  Fixed to the head of reinforced earthwork and anchor work, even if slope collapse occurs and the load acts on the net, the net will not be damaged, and the net fixing part has durability for metals such as seawater splashes and rainwater. A wire mesh fixing device for reinforcing soil, characterized in that the mesh is fixed in combination with a kneaded mortar capable of maintaining long-term durability in which a substance to be lowered cannot easily enter.   The wire mesh fixing device according to claim 1, wherein a metal product such as a square washer can be installed at a position higher than the soil in order to improve durability.

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