JPH0351845B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an embankment stabilization method for stabilizing the embankment by burying anchors within the embankment.

(Prior Art) Generally, embankments are constructed by stacking embankment materials 2 such as earth and sand in layers, as shown in Figs. This is installed and buried in embankment 1. Fig. 1 shows a retaining wall made by constructing an embankment 1, in which a wall plate 5 and supporting columns 6 are installed in the front, and an anchor rod 3 is fixed to the column by penetrating the wall plate 5. ing. Figure 2 shows embankment 1 as the roadbed.

Conventionally, a steel plate or a concrete plate has been used as the anchor body 4 of the anchor buried in the embankment as described above, but both cases have the following problems.

(Problems to be Solved by the Invention) When using an iron plate, it is necessary to make a hole for the insertion of the anchor rod 3 in it, insert the anchor rod, and fix the two by welding or nuts. In this case, a special technique called welding and a nut are required, and a thread for screwing the nut is formed on the anchor rod, so the processing is troublesome and the cost is high.

When using a concrete plate, it is necessary to form a concrete plate with a hole for inserting the anchor rod in advance, insert the anchor rod into the concrete plate, and fix both with nuts. In this case, a nut is required in the same manner as described above, and a thread for screwing the nut is formed on the anchor rod, which is cumbersome to process and expensive.

In the case of both steel plates and concrete plates, they are manufactured as ready-made items, which not only incurs transportation costs to the site, but also is designed to have a higher pull-out strength than necessary, resulting in a lot of waste. In other words, the pull-out strength of an anchor is determined by the size of the anchor body, the nature of the supplied soil, the strength of its compaction, etc. However, various types of soil are brought to the construction site, and the strength of compaction also varies at the site. This will depend on the type of compaction method used, so there are many undetermined factors at the design stage. Therefore, it is important to design the anchor, especially the anchor body, with safety in mind.
This results in an excessively large design, which increases the cost accordingly.

This invention was made in view of the conventional problems as described above, and is based on the premise that the anchor body is manufactured from cast-in-place concrete, and incorporates the manufacturing process into the embankment construction process.
The object of the present invention is to provide a construction method that can inexpensively manufacture an anchor with a required pull-out strength and reduce construction costs.

(Means for Solving the Problems) This invention to achieve the above object is to create a hole in the upper part of each layer of embankment material when building an embankment by piling up embankment materials in layers. At the same time, anchor rods are placed on the top of each layer and a portion of the rods are placed over the holes, then embankment materials are piled up to an appropriate height around the holes, the anchor rods are buried inside, and the holes are filled with concrete. This is an embankment stabilization method that is characterized by being integrated with anchor rods.

(Function) According to the above method, the anchor body is formed with cast-in-place concrete as the embankment is constructed. You can set the size to whatever you want. The concrete filled in the hole increases its strength over time, but the rising speed of the embankment is not that fast, so the initial strength of the concrete does not need to be that high.

(Example) Figures 3A to 3D show the steps of this invention method.

As shown in Fig. 3A, the embankment material 2 is piled up in layers, a hole 7 of the required size is made in the upper part of this layer,
An anchor rod 3 made of reinforcing steel or the like is laid down on the top surface of this layer, and the end where the hook 3a is formed is inserted into the hole 7.
position it above.

Next, as shown in FIG. 3B, formwork 8 is inserted into hole 7.
Place. As shown in Figs. 4 and 5, the formwork 8 is
It is made of a rectangular tube shape with a pair of side plates 8a and 8b, and a long groove 9 is formed in the side plate 8a that intersects with the anchor rod 3. When the formwork 8 is placed, the anchor rod 3 is inserted into the long groove. Accepted by 9.

Next, as shown in Fig. 3C, after the embankment material 2 is piled up to the height of the formwork 8 and compacted, the formwork 8 is pulled out as shown in Fig. 3D, and concrete is filled into the hole surrounded by soil. The anchor body 4 is formed integrally with the anchor rod 3 by hardening. Thereafter, each time the embankment materials are piled up in layers, the above steps are repeated to construct an embankment as shown in FIG. 1 or FIG. 2. The embankment material may be piled up on the anchor body 4 before the concrete has completely hardened.

When it is necessary to connect long anchor rods as shown in Fig. 2, the ends of the anchor rods 3 are connected with wire 10, etc., as shown in Fig. 6, and concrete is poured at the connected ends. It's good to do that. This eliminates the need to weld the anchor rods together. In this case, long grooves 9 are formed in a pair of opposing side plates 8a of the formwork 8, respectively.

FIG. 7 shows the results of a pull-out test of an anchor formed according to the construction method of this invention 6 days after concrete placement. As shown in FIG. 8, there are two types of anchor bodies with dimensions a x b x c of 20 cm x 20 cm x 60 cm and 40 cm x 40 cm x 60 cm.

(Effects of the Invention) As described above, according to the present invention, the anchor body is formed from cast-in-place concrete during the construction of the embankment, so various factors such as the type of embankment material and the degree of compaction are taken into consideration. Therefore, the size of the anchor body can be set to a required size each time, so the strength of the anchor body does not become larger than necessary, and construction costs can be reduced. Further, there is no need for any welding work or thread processing for nut attachment, which is required in the past, and processing time can be significantly reduced.

Since the concrete is filled into the holes formed during the construction of the embankment, there is no need for formwork for concrete pouring, and excess water in the filled concrete will seep into the embankment material. , high strength concrete mass can be obtained at an early stage.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views showing general embankments, Figure 3
Figures A to 3D are cross-sectional views showing the steps of this invention method;
Figure 4 is a plan view showing the formwork used for the same as above, Figure 5
The figure is a side view taken along the line A-A in Fig. 4, Fig. 6 is a plan view showing how the anchor rods are connected together, Fig. 7 is a graph showing the results of the anchor pullout test,
FIG. 8 is a perspective view showing the dimensions of the anchor used in the above test. 1... Embankment, 2... Embankment material, 3... Anchor rod, 4... Anchor body, 7... Hole, 8... Formwork.

Claims (1)

[Claims] 1. When constructing an embankment by stacking embankment materials in layers, drill a hole in the top of each layer of embankment material, place an anchor rod on top of each layer, and place a part of it over the hole. Then, the embankment stabilization method is characterized in that embankment materials are piled up to an appropriate height around the hole, anchor rods are buried therein, and concrete is filled in the hole and integrated with the anchor rods.