JPH11181801A - Wooden l-shaped retaining wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conserve natural environment and increase demands of domestic materials by producing an L-shaped member that rectangular lumbers are combined, in advance in a lumber processing factory and sending it in a construction site as it is a member and inserting a round bar into an assembling hole made in a specified position and fastening several L-shaped members to obtain a necessary width with a nut to constitute an integrally formed L-shaped retaining wall. SOLUTION: Square members such as japanese cedar are cut to connect them together at every three pieces and assembled at right angles and fastened with nails, bolts, etc., to form an L-shaped member 8. A necessary number of L-shaped members 8 are assembled while inserting a round bar 5 into an assembling hole 7 made at a specified position and both ends are fastened with nuts 6 to integrally form a retaining wall unit. Steel metal ties 4 are put in at every a plurality of L-shaped members 8 and the assembling holes are lined up and the round bar 5 is inserted in the holes in order to withstand stresses brought in the L-shaped connection part due to the earth pressure. A triangle formed by the base 2 and the metal tie 4 is constituted to define a large isosceles triangle as much as possible. And hence, conservation of natural environment and increase of demands for domestic materials can be attempted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wooden L-shaped retaining wall used for retaining wall work, earth retaining work and waterway work in civil engineering work.

[0002]

2. Description of the Related Art In conventional civil engineering, retaining walls are generally cast-in-place concrete retaining walls or precast L-type retaining walls for concrete secondary products. The log braiding method was used.

[0003]

[Problems to be Solved by the Invention]
Although concrete is generally used, a retaining wall construction using wood will be developed as a method that considers the preservation of the natural environment and the landscape.

[0004] In order to fulfill the function of a retaining wall using wood, a log fence method or a log braiding method is used. However, construction above a certain height is difficult and requires much labor. There was a problem.

[0005] The retaining wall of cast-in-place concrete is first formed by assembling a concrete formwork, casting fresh concrete, hardening concrete after a certain period of time, and removing the concrete formwork. It takes a period of construction.

For the purpose of shortening the construction period and saving labor on site, precast L-type retaining walls for concrete secondary products have become widespread. However, due to their heavy weight, heavy equipment such as truck cranes is required. It can not be used on construction sites such as hillsides of mountainous construction that can not be entered.

[0007] Wood is generally used as a building material, but demand is sluggish due to a slump in material prices due to various reasons. In particular, a new utilization method is to be developed in the civil engineering business in order to increase demand for domestic timber. .

[0008]

As a method of solving these problems, as a construction method, an L-shaped member in which square members are combined with an L-shape is manufactured in a wood processing factory in advance, and the member is transported as it is to a construction site. A number of L-shaped members having a required width at a construction site are passed through a round steel through an assembling hole formed at a predetermined position, and integrated with a nut to form a wooden L-shaped retaining wall.

The L-shaped joint is cut into three joints,
Joining with nails, etc., but the strength is insufficient to cope with the earth pressure of external force, so as shown in FIG. 3, a metal tie made of steel is formed as a triangle between the L-shaped wall and the base, The metal tie is assembled while being assembled into the round steel.

[0010] The use of metal ties is because the strength per unit weight of wood is higher than other materials, but the strength per unit cross-sectional area is inferior to that of iron. It is.

A method of supporting the wall (1) with a wooden stick without using a metal tie is considered, but the L-shaped retaining wall resists earth pressure and is stable against overturning, sliding and ground reaction. This is because of the weight of the L-shaped retaining wall itself and the load of the back sediment loaded on the L-shaped base by backfilling. The stability of the wall depends on how efficiently the back sediment can be loaded. In this respect, the metal tie has a significantly smaller vertical cross section than when a wooden brace is used, which facilitates backfilling and compaction of the back sediment, and efficiently loads the back sediment on the L-shaped base. It is better to use a metal tie because it can be hung.

In the case where a wooden stick is used to support the wall (1), a stick corresponding to the compressive stress is installed on the front surface of the retaining wall. However, the length of the base part becomes longer, and on steep slopes that require retaining walls, it is impossible to secure the base ground with the length of the base part, making it impossible to install. is there. The metal tie is manufactured at a factory in advance by drilling assembly holes at fixed positions at both ends of a thin and fixed length thin steel plate.

The height at which the function of the retaining wall can be achieved by the log fencing method or the log braiding method is at most about 1 m. However, in the wooden L-shaped retaining wall, the length of the rectangular lumber assembled in the L-shape and the cross-sectional dimension corresponding thereto are set. By obtaining the required size, a retaining wall having an arbitrary height is obtained.

According to the construction conditions, the shape of the wood used is not limited to square wood, but also flat wood, tycoon, and log.
Tree species and materials should be used as required, such as required strength, material supply and economics.

In particular, for applications requiring an aesthetic appearance, there is a method in which the height of each member of the wall portion is made uneven so as to have a change.

[0016]

Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 2, three regular squares such as cedar are cut into a joint, assembled at a right angle, nailed or bolted or fastened with an adhesive to form an L-shaped member (L-shaped member), which is then left in place. The required number of L-shaped members (8) are assembled while inserting the round steel (5) into the assembled holes (7), and both ends are tightened with nuts to integrate them into one unit of the L-shaped retaining wall as shown in FIG. And

When assembling the L-shaped member (8) to resist the stress generated in the L-shaped joint (3) due to earth pressure, as shown in FIG. The metal tie (4) is sandwiched, the assembly holes (7) and the assembly holes (7 ') are aligned and assembled through the round bar (5). In the position 7), it is important that the triangle formed by the wall (1), the base (2) and the metal tie (4) mechanically forms an isosceles triangle as large as possible. The gap between the L-shaped members (8) sandwiching the metal tie 4 is a gap corresponding to the thickness of the metal tie (4), but there is no problem in use.

When the height of the wall (1) is 1 m, the square beam is 9
cm square, 10 cm square at 1.5 m and 12 at 2 m
An appropriate cm square is appropriate, and the ratio of the length of the wall portion (1) to the length of the base (2) is appropriately 1: 0.7 from the viewpoint of stability calculation of the retaining wall with respect to earth pressure and economy.

From the viewpoint of durability, it is desirable that the wood used for the retaining wall be subjected to antiseptic processing and the metal fittings be made of stainless steel.

In order to save labor at the construction site, the L-shaped members and metal ties of the retaining wall are factory-produced. From the viewpoint of transportation costs, it is better to carry in the L-shaped members to the construction site and assemble them at the construction site. desirable. Further, even in a construction site where a heavy machine cannot be used and a scaffold is poor, the L-shaped member can be carried in and assembled at the site.

Each unit is independently stabilized against the earth pressure on the back side as a retaining wall, but if necessary for fastening the units, it is advisable to use a scallops.

If the retaining wall is to be installed in an inner curve section, the base (2) should be in contact with the wall (1) of each unit.
Is set to open according to the curve, and Kasugai is on the wall (1)
Use only. In order to accurately install the base according to the curve, the base (2) of the adjacent unit is preferably nailed with small square wood and positioned.

A timber or a log can be used in place of the square lumber. When used in a park where aesthetics are required, the height of each member of the wall portion (1) can be arbitrarily set to provide irregularities. Good.

[0024]

EXAMPLE In the example of the prefectural work road in Kagoshima prefecture, 28 m was constructed as a roadside retaining wall using 14 sets of 1.5 m high and 2 m long units. Cedar 10.5c for L-shaped member
In the timber processing factory, we made notches, creosote preservation processing, and assembly of L-shaped members using a set of L-shaped members (8) at the construction site.
Assembled as a unit, installation on the site after floor digging,
The sand was laid, and a backhoe was used to set it. Kasugai was used to bind the units together.

Further, in the example of the prefecture's project, the construction of 26 m was carried out using 13 sets of 1 m high and 2 m long units as roadside retaining walls. The L-shaped members are made of cedar 9cm square wood. At the wood processing factory, cut, preservation of creosote and assembling of L-shaped members are manufactured. After being manually brought into the installation site, 21 sets of L-shaped members are assembled. It was used as a unit with a length of 2 m, and after assembling and digging the ground, the sand was spread and installed manually.

[0026]

The wooden L-shaped retaining wall according to the present invention enables the construction of a retaining wall having a height higher than that of a wooden facility, such as a log fence method or a log braiding method, and is easy and cost effective. It is cheap. Since wood is a recyclable construction material, it has a smaller impact on the natural environment than cast-in-place concrete and secondary concrete products, blends into the surrounding natural landscape, and is effective in forming the landscape. Compared to cast-in-place concrete retaining walls and precast L-type retaining walls for concrete secondary products that use mortar on site, the construction method can be shortened due to the dry method, and it can be transported by human power due to its light weight. Installation is easy even on steep slopes on the hillside where heavy equipment cannot be used for mountain control projects. If the demand for wood is expanded by using a lot of wood such as thinned wood as construction materials, utilization of local resources will be promoted, contributing to the promotion of forestry and regional development, and promotion of thinning will create rich forests. .
Since the wooden L-shaped retaining wall has a simple shape and structure, it can be easily manufactured at any wood processing facility, and does not require any special technology for installation on the site, and is likely to be widely used.

[Brief description of the drawings]

FIG. 1 is a perspective view of a wooden L-shaped retaining wall of the present invention.

FIG. 2 is a diagram showing an example of a connection processing of an L-shaped member and a state of assembly.

FIG. 3 is a diagram showing a state of installation of metal ties.

FIG. 4 is a front view of the wooden L-shaped retaining wall of the present invention.

FIG. 5 is a perspective view of an example in which the height of the wooden L-shaped retaining wall of the present invention is made uneven.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wall part 2 Base 3 L-shaped joint part 4 Metal tie 5 Round steel 6 Nut 7 Assembly hole 7 'Assembly hole 8 L-shaped member

Claims (3)

[Claims] 1. A wooden L-shaped member (8) in which square members are combined at right angles, and an assembling hole (7) is perforated at predetermined positions of a wall (1) and a base (2), and assembling holes (2) at both ends. 7 '), and a required number of L-shaped members (8) are arranged for each of the plurality of L-shaped members (8) with the metal ties (4) interposed therebetween. (7) A wooden L-shaped retaining wall characterized in that a round bar (5) is inserted through an assembling hole (7 '), and both ends are tightened with nuts (6) to be integrated. 2. The wooden L-shaped retaining wall according to claim 1, wherein a wood having an irregular cross section such as a log or a tyco is used for the square. 3. The wooden L-shaped retaining wall according to claim 1, wherein the height of the wall portion (1) of each of the L-shaped members (8) to be incorporated is arbitrarily set.