JPS6053137B2 - Embankment construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing an embankment body in which each layer of embankment body is sequentially formed while retaining the earth in front of the embankment body.

Conventionally, when building an embankment, the front of the embankment is secured with concrete, interstitial stones, blocks, etc., and at the same time, embankment is carried out.

However, this construction method had the following drawbacks.

<B> The concrete retaining wall covering the front of the structure will not be an independent structure, but will be constructed as an integral and rigid structure.

Therefore, when the ground subsides, it may not be able to follow the subsidence, resulting in breaks, cracks, etc.

<Entrance> Embankment work and earth retaining work must be carried out alternately, resulting in poor construction efficiency. 〈C〉 Due to poor workability, the construction period will be long and costs will be high. Recently, the so-called Terre Alme construction method has been used to construct earth retaining walls using the frictional force between earth and sand and strips embedded therein as resistors.

This construction method also has the following drawbacks.

<A> Since the covering is formed by a combination of precast members, it can adapt to some deformation, but it cannot completely follow the subsidence of the ground. <Exposure> Because precast members and strip materials are constructed of concrete or steel plates, transporting and erecting them may be difficult.

<C> In terms of construction management, the laying of strip materials, the connection of skin materials and strip materials, and the rolling and compaction of the embankment in contact with the skin materials require considerable skill.
The present invention has been made in order to improve the drawbacks of the conventional embankment construction method described above, and is a embankment that is superior in construction efficiency and economical efficiency, and is capable of maintaining the stability of the embankment even when the ground subsides. The purpose is to provide a body construction method. Next, an example will be described.

<A> Overall configuration The embankment body of the present invention is composed of a covering net 1, a resistance net 2, and a connecting cage 3, and each net will be explained below.

As shown in FIG. 1, the covering net 1 is a band-shaped net having excellent strength and flexibility, and has, for example, a grid, hexagonal, or diamond-shaped mesh.

Further, since the covering net 1 is used to cover the front surface of the embankment and retain the earth, as will be described later, a net having a mesh size sufficient to prevent the outflow of the earth and sand is used in consideration of the grain size of the earth and sand.

<Exposure> Resistance net The resistance net 2 is a belt-shaped net similar to the covering net 1 described above.

The resistance net 2 uses a net made of, for example, synthetic fiber or steel wire, which has excellent strength and flexibility.

The size of the mesh of the resistance net 2 is not limited as in the case of the covering net 1, but a size that does not interfere with drainage in the earth and sand is used. Further, the resistance net 2 and the covering net 1 can also be formed by cutting a rolled net having the same mesh into appropriate lengths.

<C> Connecting basket The connecting basket 3 is also a mesh body having an appropriate mesh size, length and width, and a certain strength, and claws 31 are provided at both ends thereof.

The mesh may be in the form of a lattice, or it may be constructed by inserting diagonal members so that tensile force can be transmitted evenly.

This connecting cage 3 is a connecting tool that connects the nets 1 and 2 by engaging the claws 31 with the covering net 1 and the resistance net 2, respectively, and then folding them. <2> Earth retaining ruler The earth retaining rulers 4 and 5 are rulers formed by combining plates made of synthetic resin, steel plate, plywood, etc. into an L-shape or T-shape.

These earth retaining rulers 4 and 5 are placed in front of the embankment body. The purpose is to prevent earth and sand from collapsing during embankment work and to shape the front surface of the embankment body.

Therefore, the angle of the combination of the earth retaining rulers 4 and 5 need not be limited to a right angle, and a ruler set at an angle equal to the slope of the front surface of the embankment body to be constructed can be formed and used.

Next, the construction method will be explained.

Laying the resistance net (Fig. 3) The resistance net 2 having the above structure and having a sufficient length is laid at a predetermined position on the base G after leveling the floor.

Next, partial soil is placed near the end of the laid resistance net 2 as shown in FIG. 3 to temporarily hold the resistance net 2 in place.

Entrance> The covering net 1 is connected via a connecting cage 3 to one end of the resistance net 2, which has been temporarily held down by the soil where the covering net is laid.

That is, after the group of claws 31 of the connecting basket 3 is engaged with the ends of both the nets 1 and 2, the claws 31 are bent inward to connect both the nets 1 and 2.

Note that in the first layer, the resistance net 2 and the covering net 1 may be connected in advance.

Gate <C> An earth retaining ruler 4 having an L-shaped cross section is installed at a fixed position on the slope of the embankment where the embankment material is rolled out.

By installing the earth retaining ruler 4 so as to be inserted between the ground G and the covering net 1, it is possible to regulate the position 1 and shape of the 4 slopes, and to prevent collapse of the rolled-out earth and sand.

Next, earth and sand are successively rolled out to a predetermined embankment height in the front and back directions of the partially laid earth, and the net exposed on the ground G is buried and compacted to construct the first layer A1. .

<2> Covering the earth and sand with a covering net (Fig. 5) After the first layer A1 is constructed, the second layer is constructed using the upper surface of the first layer A1 as a new base and using almost the same process as the construction of the first layer A1. Build ~ and beyond.

As shown in FIG. 5, a newly laid resistance net 2'' is temporarily held on the upper surface of the first layer A1 with partially laid soil, and its front end is engaged with the claw 31 of the connecting cage 3''.

Next, the free end of the covering net 1 of the first layer A1 is flipped up and wrapped around the front end surface of the embankment of the first layer A1, and the free end is engaged with the claw 31 of the connecting cage 3 of the second layer A2 to cover it. complete. <E> Unrolling the second layer After removing the earth retaining ruler 4 with an L-shaped cross section that was used when constructing the first layer A1, a T-shaped cross section is placed on the upper front surface of the covering net 1 that wrapped the first layer A1. A new earth retaining ruler 5 is placed.

(FIG. 6) The covering net 1'' is temporarily placed on the earth retaining ruler 5 in the same manner as in the construction of the first layer A1, and the earth and sand are rolled out to complete the unrolling of the second layer.

Covering net 1 placed between first layer A1 and second layer A2
The free end of `` is flipped up in a state that wraps around the front end surface of the second layer ~, and is connected to the connecting basket 3 when constructing the third layer A3.

The covering net 1 is a resistance net 2 laid between its upper and lower layers.
A powerful frictional force is obtained by connecting with the Therefore, the earth and sand in front of each layer will not collapse due to the covering net 1 being unable to support it. If the front surface of the embankment body to be constructed is inclined, a retaining ruler 5 having an angle suitable for the inclination is used.

(Fig. 7)〈〈〈〈〈〈〈〈〉〈〈〉〈〈〉〈〈〉〈〈〉〈〉〈〈〉〈〈〉〈〈〉〈〈〉〈〉〈Other Examples〉 In the above embodiments, each layer is constructed sequentially to construct a predetermined levee body. It is also possible to carry out the method in advance, or to carry out the unwinding of the earth and sand only from the rear part first.

This can improve work efficiency depending on the type of construction.

In addition, from the viewpoint of stability of the design structure of the embankment body, landscaping, and aesthetic considerations, after constructing the embankment body, a retaining wall made of shotcrete, cast-in-place concrete, etc., or a covering body using the sill construction method is formed in front of the covering net 1. It is also possible.

In this case, it is possible to prevent the occurrence of chips, cracks, etc. by leaving the embankment and allowing it to sink as much as possible after constructing the embankment.

In addition, in order to stabilize and reinforce the sheathing, it is also possible to bury an anchor cable or the like between the unrolling layers in advance, and then tension and fix it from the front surface of the embankment after the sheathing has been formed.

In this case, the work of polling and drilling can be omitted.

Since the present invention is as explained above, the following effects can be expected.

In the construction method of the present invention, the earth and sand in front of each layer is supported by the covering net 1, and the resistance net 2 connected to this net 1 disperses the earth pressure applied to the covering net 1. Collapse can be prevented.

Construction and quality control are easy because the earth and sand are rolled out successively for each layer.

<C> Since large-sized materials are not required as earth retaining materials, construction can be carried out without being restricted by site conditions.

(2) From the viewpoint of embankment stability and aesthetic considerations, any covering body such as a retaining wall, slope work, etc., may be formed on the front of the covering net 1 by spraying concrete or cast-in-place concrete after constructing the embankment body.

<E> In the above case, if the embankment is left to settle after construction and is allowed to settle as much as possible, then the occurrence of chips, cracks, etc. in the covering can be prevented.

[Brief explanation of the drawing]

Figure 1: An explanatory diagram of the earth retaining net used in the present invention, Figure 2: An explanatory perspective view of a connected cage, Figures 3 to 6: A cross-sectional construction explanatory diagram,
Fig. 7: Construction explanatory diagram in case of having an inclined surface. 1: Covered net, 2: Resistance net, 3: Connected cage, 4, 5
: Earth retaining ruler.

Claims (1)

[Claims] 1. One end of a covering net laid between layers of embankment is connected to a resistance net laid between the same layers via a connecting cage, and the other end of the covering net is connected to the upper surface of the layer. An embankment body in which the upper layer is successively constructed by flipping up and covering the front edges of the upper layer of earth and sand, and connecting the edge of the flipped up covering net to the resistance net laid on the top surface of the upper layer via a connecting cage. construction method.