JP2005023724A - Repair method for protection fence - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To repair a metallic road protection fence into a protection fence having the appearance of natural wood by utilizing a support column of the metallic road protection fence. <P>SOLUTION: A lumber 1 such as thinnings is hollowed to provide a hollow part 2, and a polyvinyl chloride pipe 3 is inserted into the hollow part 2 to integrate the lumber 1 and the polyvinyl chloride pipe 3 together. Since the polyvinyl chloride pipe 3 is loaded in the hollow part 2, cross sectional area of the hollow part 2 is not reduced even by drying, and constant cross sectional area is kept to cover the metallic support column 4 of an existing guard rail securely. Consequently, it is possible to avoid the situation in which the hollow lumber causes crack by diameter expansion work of the hollow part due to contraction by drying and unreasonable loading and shorten construction term. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for repairing an existing metal road protection fence to a protection fence having a natural wood appearance by covering it with wood.

Conventionally, wood cores such as thinned wood are cut out to use wood as a protective fence, and steel pipes are inserted as reinforcements in the hollowed out parts, or the core is removed by splitting the wood into half and forming recesses Reinforced wood has been proposed in which a half-timber is covered with a steel pipe.
JP 2000-144661 A JP 2001-295223 A

  When applying the idea of reinforcing wood using steel pipes as a core material to existing guardrails, hollow wood that has been hollowed out at the factory is transported to the site where the guardrails are installed, and existing guardrails and guard pipe rails are used. Or the pipe is removed and the metal column is covered with hollow wood, but the cross section of the hollow part is due to the drying of the wood due to the passage of time from the hollow part formation by wood cutting work to the construction site In some cases, it is impossible to smoothly load the metal support on the metal support and cover it.

In addition, if the hollow wood is forcibly pushed into the support column, the wood may be broken, and a new member has to be procured, which may take time for construction.
When a hollow part with a diameter that allows for cross-sectional shrinkage due to drying is formed, the degree of drying differs depending on the quality of the wood, the humidity of the environment during transportation and storage, and the position when stacked, and drying of all hollow wood is uniform. However, there was a case where a gap was formed without fitting the metal support so that the wood and the metal support could not be integrated.

  The present invention uses a metal post of a protective fence made of a metal post such as a steel pipe as it is, and when the appearance is changed to wood, the construction is surely performed without taking time and trouble even by drying shrinkage of the wood. It makes it possible to cover and integrate the columns with hollow wood.

A hollow part is formed by hollowing out wood, and a synthetic resin pipe is loaded into this hollow part to prevent the hollow part from shrinking due to drying of the wood, and the appearance of the existing metal guard fence post is changed to wooden. .
Further, a hollow wood having a hollow portion having a diameter larger than that of the metal support is covered, and the hollow portion is filled with a filler so as to be integrated.

By hollowing out wood to provide a hollow portion and loading a resin pipe into the hollow portion, the hollow portion is prevented from shrinking due to drying, and construction can be performed reliably without taking time and effort due to drying shrinkage.
In addition, expecting dryness, forming a hollow part with a diameter larger than the diameter of the metal support, filling the gap with resin, and integrating the wood and the metal support, the construction can be done without taking time and effort due to drying shrinkage. The construction was made possible.

Since the synthetic resin is pressed into the hollow portion at high pressure and the resin is infiltrated into the wood, the wood is prevented from being corroded and the warpage of the wood is reduced.
The manufacturing process is simple, production costs can be reduced, and thinned wood can be used effectively.

According to the repairing method of the present invention, since the existing metal support is used, a protective fence having an appearance similar to that of natural wood itself can be obtained while having sufficient strength.
Since the hollow portion is provided by hollowing out the core of the wood and the resin pipe is inserted, the cross-section of the hollow portion does not decrease even when the wood is dried, and it can be reliably put on the pillar of the existing protective fence. Moreover, since construction is performed reliably, there is no need to redo it, and as a result, the construction period can be shortened.
The manufacturing process is simple and the production cost is not so high, and the metal struts of the existing protective fence are used as they are, so that the resources are effectively used.

The wood 1 is used by appropriately selecting and using thinned wood such as cedar, pine, deciduous pine and firewood, and the kind of wood is not particularly limited.
Wood 1 such as thinned wood is subjected to antiseptic and insecticidal treatment such as CCA processing (zinc naphthenate), and dried by spraying steam at 70 to 95 ° C. for 24 hours.
A hollow portion 2 is formed by hollowing out the core of the wood 1 and subjected to cracking prevention processing such as polyethylene glycol treatment. Polyethylene glycol is substituted for the moisture in the wood tissue and suppresses the evaporation of moisture in the wood cells, so that the shrinkage of the wood 1 is prevented to some extent. As shown in the cross-sectional view of FIG. 1, there is a case where a groove 21 is formed in the longitudinal direction of the hollow portion to prevent warpage.

  In order to prevent a reduction in the cross section of the hollow portion 2 due to drying shrinkage, a vinyl chloride pipe 3 having a wall thickness of 2 to 3 mm is loaded. If necessary, an adhesive such as polyurethane resin is applied to the outer periphery of the vinyl chloride pipe 3 and inserted to integrate the vinyl chloride pipe 3 and the wood 1 to prevent a reduction in the cross section of the hollow portion.

  Inserting a reinforcing material made of wire mesh, glass fiber or carbon fiber into a hollow part, inserting thermosetting synthetic resin such as epoxy resin while rotating wood, and attaching the resin to the inner wall of the hollow part by centrifugal force Then, a smooth fiber-reinforced synthetic resin (FRP) pipe with an inner wall surface is formed in the hollow portion of the wood. Although it is possible to fill the hollow part with resin without using a reinforcing material, the strength of the resin alone may not sufficiently prevent the cross-sectional shrinkage of the hollow part due to drying. preferable.

FIG. 2 shows an existing guardrail covered with the hollow wood of the present invention. A lubricant is applied to the surface of the metal support 4 or the hollow portion 2 of the wood 1 so that the hollow wood can be easily loaded into the metal support 4.
When the covering of the metal support 4 with the wood 1 is completed, a wood cap 5 is attached to the head. A steel pipe reinforced wood or wood cross member 6 is attached between the columns as shown in FIG. 3, and the metal protective fence is modified to a wooden protective fence.

  When the hollow part has a sufficient diameter for drying, there is a gap of about 1 mm between the hollow part inner wall of the wood 1 and the metal support column 4, so that it is necessary to use a lubricant for insertion. Rather, the metal support 4 can be easily covered. The gap is filled and solidified with an adhesive resin such as polyurethane resin or epoxy resin, and the wood and the metal support 4 are integrated. A wooden cap 5 is attached to the head of the column.

Cross section of hollow wood. The front view of the protection fence which covered the hollow timber. An enlarged view of a column covered with hollow wood.

Explanation of symbols

1 Wood 2 Hollow 3 Vinyl chloride pipe
4 Metal support

Claims (3)

A method of repairing a protective fence made of a wooden support by hollowing out a metal core of a protective fence and placing a hollow piece of wood with a synthetic resin pipe in the hollow. Hollow wood for repairing metal struts with a hollow core and a synthetic resin pipe in the hollow. A method for repairing a protective fence in which a metal support of a protective fence is covered with a hollow wood having a hollow portion having a diameter larger than the diameter of the metal support, and the gap is filled with a filler.

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