JPH0453215B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a foam block made of synthetic resin for constructing roads on soft ground or for improving the utilization of listed land on land with steps. This invention relates to an anchor device for stabilizing stacked foam blocks in a structure in which foam blocks are stacked to form an embankment.

(Prior Art) Currently being attempted is a construction method in which foam blocks made of synthetic resin are stacked on soft ground and a road is laid on top of the blocks. According to this construction method, the lightweight nature of the foam blocks prevents ground subsidence and enables rapid construction.

In addition, on land with steps, foam blocks are stacked in an inverted triangle shape on the lower land, and the inclination angle of the retaining wall, which is the boundary of the step, is brought closer to vertical, thereby improving the utilization of the listed land. A similar construct has also been proposed by the present inventors.

(Problems to be Solved by the Invention) In the above-mentioned embankment using foam blocks, it is necessary to prevent the foam blocks from protruding or popping out at the wall end faces due to horizontal earth pressure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a means for preventing a foam block from protruding or popping out at the wall end face of a foam block construction.

(Means for Solving the Problems) The present invention is characterized in that a tension member is arranged horizontally between the upper and lower foam blocks, one end of the tension member is fixed to the ground behind, and the other end is attached to the foam block. It is located where the regulating part of the wall end face is provided.

(Example) Below, an example of the present invention will be described based on the drawings.

First, a foam block construction to which the present invention is applied will be explained based on FIG.

This example shows an example where one side of the road is sloped land, and a road is embanked on the soft ground below the slope. However, it goes without saying that the foam block construction to which the present invention is applied is not limited to this.

Foam blocks 2 are stacked on soft ground 1,
Road 3 will be built on top of it. Here, the foamed block 2 is a block molded product of synthetic resin such as foamed polystyrene, foamed polyethylene, foamed urethane, etc., and foamed polyethylene (foamed styrene) is particularly desirable because it is inexpensive.

This construction is performed as follows.

Approximately L-shaped concrete block 4A on ground 1
is installed, and a sandy soil layer 5 with good water permeability is laid on top of it.

On this sandy soil layer 5, foam blocks 2 are stacked vertically and horizontally. The foam blocks 2 are fastened to each other by fasteners 6A and 6B to ensure good stability and no slippage. Binding tools 6A, 6B
In this case, the claw 7 formed on the edge of the metal plate is bent,
This claw 7 is used by biting into the foam block 2. Among these, the fastener 6A has claws 7 bent in the opposite direction, and is used inside the foam block 2 construction. On the other hand, the fastener 6B has a claw 7 bent in one direction, and is used on the wall end surface 8 of the foam blocks 2 stacked one above the other.

Between the foam block 2 and the ground 9 behind it,
A foam block backfilling material 10 made of a mixture of natural earth and sand and foam particles of synthetic resin is filled. The reason for using such a mixture is to eliminate the inconvenience caused by the difference in properties between the earth 9 and the foam block 2.

A formwork 12 is installed on the edge of the listed 11 of the stacked foam blocks 2, and this formwork 12 is filled in and a listed concrete slab 13 containing reinforcing bars is cast on site. This listed concrete slab 13 improves the integrity of the foam block 2 and stabilizes the entire foam block construction.

However, if the structure is low, the listed concrete slab 13 alone is sufficient to stabilize the structure, but if the structure is high, the foam blocks 2 may protrude or pop out due to horizontal earth pressure at the wall end face 8 at the middle height of the structure. There is a risk. Therefore, an anchor device is provided to restrict the wall end surface 8, and this will be explained with reference to FIG. 2 as well.

When the foam blocks 2 are stacked up to the middle of the height of the structure, tension members 14 made of steel rods are placed horizontally on the foam blocks 2 at regular intervals in the depth direction. A pile 16 is attached to a step 15 formed on the slope of the ground 9.
is driven into the pile 16, and a hook-shaped rock fixing portion 17 provided at one end of the tension member 14 is engaged with the pile 16 and fixed. The tension member 14 is for pulling the foam block 2 from behind.

On the other hand, the other end 18 of the tension member 14 is arranged to protrude from the side end surface 8 of the foam block 2. The other end 18 of the fastener 6B is passed through the hole 19 in the center thereof, and the claw 7 is bitten into the adjacent foam block 2. Next, a spacer 20 is passed through the other end 18, penetrates a cover 26 (described later) that covers the wall end surface 8, and a nut 22 is screwed onto the male threaded portion 21 of the spacer 20 from the outside of the cover 26.

The rock fixing part 17 at one end of the tension member 14 is connected to the rock 9
The tightening force of the nut 22 acts on the fastening tool 6B via the cover 26 and the spacer 20, and the fastening tool 6B fastens the foam block 2, so that the wall end surface 8 can be restricted.

In this anchor device, the other end 18 of the tension member 14, the spacer 20, the cover 26, the nut 2
2 and the fastening tool 6B are connected to the wall end surface 8 of the foam block 2.
It constitutes a regulatory department that regulates the

A plurality of fasteners 6A are arranged along the length of the tension member 14 to fasten the foam blocks 2 together.

A concrete block 4B is placed on the edge of the listed concrete slab 13 and fixed with bolts 24.

A sandy soil layer 25 with good water permeability is laid on top of this, and a road 3 paved with concrete or asphalt is further laid on top of it. The upper concrete block 4B is the same as the lower concrete block, and is installed upside down.

The upper and lower ends of a cover 26 made of a corrugated iron plate are fixed with bolts 27 and 28 between the upper concrete block 4B and the lower concrete block 4A. This cover 26 covers the wall end face 8 of the foam block 2 to prevent the foam block 2 from being exposed to ultraviolet rays, thereby preventing the foam block 2 from deteriorating.

Drainage from the upper sandy soil layer 25 comes out of the drain 29 of the upper concrete block 4B and falls through the gap 30 between the wall end surface 8 and the cover 26. The water then flows down through the foam block backfilling material 10 and is discharged from the drain 31 of the concrete block 4A below together with the wastewater that has permeated through the sandy soil layer 5 below.

Since the foam block structure constructed in this manner is lightweight, ground subsidence can be prevented even if the ground 1 is soft.

Furthermore, since the horizontal earth pressure at the wall end face 8 is small, the slope of the cover 26 can be made close to vertical, and the utilization of the listed land can be improved.

An embodiment of the above-mentioned anchor device according to the present invention will be described next.

The anchor device shown in Figures 3 and 4 A and B is as follows:
It is structured as follows.

The tension member 14 is made of an iron band, and a rock fixing part 17 made of a hook-shaped steel rod is fixed to the end of the iron band. Further, the regulating portion is composed of a restraining plate 32 provided at one end of the tension member 14, and this restraining plate 32 is in close contact with the wall end face 8. Tension member 14
Claws 7 are formed on the upper and lower sides of the left and right edges of the foam block 2 to tightly connect the foam blocks 2 to each other.

The anchor device shown in FIGS. 5A and 5B is constructed as follows.

Formworks 33 having a substantially L-shaped cross section are arranged in the horizontal direction of the wall end surface 8 at the edge of the intermediate surface of the foam block 2 construction, and are interconnected by bolts 35, which will be described later.
A concrete slab containing reinforcing steel is placed on the foam block 2 using the formwork 33, and this concrete slab serves as the tension member 14. A ground anchorage part 17 at one end of the tension member 14 made of concrete slab
A stake 16 is fixed to the. On the other hand, tension member 1
At the other end 18 of 4, a regulating portion is configured as follows. The formwork 33 is connected to the bolt 3 through the band iron 34.
5, the claws 7 bent downward from the bottom of the formwork 33 bite into the foam block 2 below, the upper part of the bolt 35 is fixed to the concrete slab, and the formwork 33 is connected to the wall end face. 8 is regulated.

In the embodiment described above, the pile 16 is driven into the stepped portion 15 provided in the earth 9, and the earth anchoring portion 17 of the tension member 14 is fixed to the pile 16. On the other hand, in the following embodiments, mortar is filled in a boring hole formed in the ground 9, and the tension member 14 is fixed therein.

The anchor device shown in FIG. 6 is constructed as follows.

The tensile member 14 is made of band iron, a boring hole 36 provided laterally in the ground 9 is filled with mortar 37, and a ground fixing section 17 is made of a ground fixing steel rod fixed to the tensile member 14. is inserted and fixed.

The regulating portion consists of a restraining plate 32. Ground fixation part 1
7 and the tension member 14 are connected by a turnbuckle 38.

In the anchor device shown in FIG. 7, a tension member 14 is made of a steel rod, and a rock fixing section 17 made of a fixing steel rod is connected via a turnbuckle 38.
The regulating portion includes a fastener 6B at the other end 18 of the tension member 14.
, and is tightened with a nut 22.

In the anchor device shown in FIG. 8, the tension member 14 is made of concrete slab.

Note that the present invention is not limited to the above embodiments.

For example, the tension member 14 of the anchoring device may be made of piano wire, a synthetic fiber with tensile strength, or a synthetic resin material.

In addition, foam block structures can be used not only for embankments to prevent subsidence on soft ground, but also for boundary retaining walls on land with steps made by stacking foam blocks,
It is a broad concept that includes construction works that reduce the horizontal earth pressure that acts on the structure by placing foam blocks adjacent to structures that are subject to earth pressure, thereby improving the utilization of listed land. There is something to be said.

(Effects of the Invention) In the anchor device according to the present invention, the tension member is arranged horizontally between the foam blocks adjacent to each other above and below the foam block structure, or in the front, rear, left and right directions, and one end of the tension member is anchored to the ground behind. , and a regulating portion for regulating the wall end face of the foam block is provided at the other end.

Therefore, the foam block is prevented from protruding or popping out at the wall end face of the foam block structure.
It becomes stable.

[Brief explanation of drawings]

FIG. 1 is a plan view of an anchor device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a foam block construction using the anchor device. FIG. 3 is a side view of another embodiment, FIG. 4A is an enlarged view thereof, and FIG. 4B is a plan view thereof. FIG. 5A is a side view of another embodiment, and FIG. 5B is a partially enlarged view thereof. FIG. 6 is a side view of another embodiment. FIG. 7 is a side view of another embodiment. FIG. 8 is a side view of another embodiment. 2: Foam block, 6A, 6B: Binding tool, 7:
Claw, 8: Wall end surface, 14: Tension member, 16: Pile, 1
7: Ground fixation part, 18: Other end, 19: Hole, 20:
Spacer, 21: Male screw part, 22: Nut.

Claims (1)

[Claims] 1. In a construction product in which a foam block structure is formed by stacking foam blocks on land below the boundary of land with a step, and the utilization of the land on which the foam block structure is listed is improved, A tensioning member is arranged horizontally between the upper and lower foam blocks, and one end of the tensioning member is provided with a ground fixing part that is fixed to the ground behind, and the other end is provided with a regulation member that regulates the wall end surface of the foam block. An anchoring device in a foam block construction, characterized in that the anchoring device is provided with a section.