JPH034692B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications This invention relates to an earth retaining method.

BACKGROUND ART As an earth retaining method, a construction method has been developed in which anchors are driven into the ground and earth retaining is performed using earth retaining panels fixed to the anchors.

In the above construction method, it is time-consuming work to drive the anchor into the ground, so a construction method is adopted in which the anchor is installed horizontally in the ground, embanked, and then buried in the soil.

However, it is not possible to obtain sufficient reaction force by simply burying tensile materials such as steel rods and steel wires as anchors in the soil. A method is used to obtain reaction force by erecting a bearing plate and burying a bearing plate in the ground.

Problems to be Solved by the Invention However, the work of erecting the bearing plate is time-consuming, and it sometimes falls over during embankment, making it impossible to reliably absorb the reaction force.

Means for Solving the Problems The earth retaining method according to the present invention includes installing a plurality of widening members, each having a width larger than a height and having horizontal grooves on the left and right end surfaces, spaced appropriately on the embankment;
Two sets of tension members are hooked into the left and right grooves of the widening member and stretched between adjacent widening members, and two sets of steel wires are used as two sets of tension members between the adjacent widening members. An anchor is inserted into the convergence member and brought close to it, and the earth retaining panel is fixed to the anchor by repeating filling and anchor installation on the anchor.

The width of the widened part is larger than the height, so it does not fall over into the embankment, making embankment work easier.

Since the widening member is held between two sets of tensile members under tension, it will not shift or come off.

A large reaction force can be obtained by the widening member having a large surface area.

Embodiment The present invention will be described in detail below based on an embodiment shown in the drawings.

<1> Excavation (Figure 8) Excavate the ground 1.

<2> Embankment Embankment 2 is made by a predetermined width from one side of the excavated ground.

<3> Installation of widening member Install widening member 3 on the embankment 2 ground. In the embodiment, the widening member 3 is made of precast concrete and is formed into an oval shape with a width w larger than a height h. Horizontal grooves 4 are formed in the left and right end surfaces of the widening member 3, respectively.

A plurality of these widening members 3 are installed separated by appropriate intervals.

<4> Arrangement of steel wire In the embodiment, two steel wires 5, 5 as two sets of tension members are hooked into the left and right grooves 4, 4 of the widening member 3, respectively, and placed between the adjacent widening members 3, 3. across.
Reinforcing bars, prestressed steel stranded wires, small-diameter PC steel bars, stranded reinforcing bars, etc. can be used as tension materials, and one or more of them can be bundled together to form a set of tension materials.

Two steel wires 5, 5 are inserted into the converging member 6 between the adjacent widening members 3, 3. The convergence member 6 includes two cylindrical plastic rings 7, 7.
Then, the steel wires 5, 5, which are made of a long cylindrical steel ring 8 and are inserted into the plastic rings 2, 2, respectively, are fitted into the steel ring 8, and the two steel wires 5, 5 are brought close to each other.

Therefore, the two steel wires 5, 5 are spaced apart by the widening member 3 and brought closer to each other by the converging member 6. When tension is applied to the steel wires 5, 5, the convergence member 6 is held between the steel wires 5, 5.

As described above, the anchor is constituted by the widening member 3, the steel wire 5, and the converging member 6.

<5> Fixing the earth retaining panel (Figure 9) A retaining panel 9 is fixed to the tip of the anchor.

As shown in FIG. 1, the retaining panel 9 is made of precast concrete and has an arcuate cross section. A vegetation shelf 10 having an L-shaped longitudinal section is formed at the lower front of the retaining panel 9.

Steel wires 5, 5 are inserted into both left and right ends of this retaining panel 9 and fixed with nuts or the like. steel wire 5,
5 may be inserted through both left and right ends of a single retaining panel 9, as shown in FIG. 7, or may be inserted through the ends of adjacent retaining panels 9, 9, respectively, as shown in FIG. .

<6> Installation of embankment and anchors (Fig. 10, 1
(Figure 1) Repeat the embankment and anchor installation, and fix the retaining panel 9 to the anchor. If necessary, pile up the retaining panels 9.

Effects of the Invention The present invention has the above-described configuration, and since the anchor is buried in the soil by embanking, the work of driving the anchor is not required, and the construction is simplified.

Since the widening member is installed with a width larger than its height, it will not fall over even if it is filled with embankment, making the work easier.

When a tension force is applied to the tension member, the width-expanding member is clamped, so that the width-expanding member does not shift or come off.

A large reaction force can be obtained by the widening member having a large surface area.

As tensile materials, reinforcing bars, prestressed steel stranded wires, small diameter PC steel bars, stranded reinforcing bars, etc. can be used, and multiple pieces can be bundled to form a set of tensile materials. The anchor strength can be increased.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a plan view of the widening member, Fig. 3 is a front view thereof, and Fig. 4 is a perspective view of an embodiment of the present invention.
The figure is a plan view of the convergence member, Figure 5 is its front view, Figures 6 and 7 are plan views of the retaining panels fixed with anchors, and Figures 8 to 11 are longitudinal sections in the construction sequence. It is a diagram. 1... Earth, 2... Embankment, 3... Widening member, 4
... Groove, 5 ... Steel wire, 6 ... Convergence member, 9 ... Earth retaining panel.

Claims (1)

[Claims] 1. A plurality of widening members, which are wider than the height and have horizontal grooves on the left and right end faces, are installed on the embankment at appropriate intervals, and two sets of tension members are hooked into the grooves on the left and right sides of the widening members, respectively. An anchor is constructed by spanning between the widening members, and inserting two sets of tension members into the converging member between adjacent widening members to make them close to each other,
An earth retaining method characterized by repeating embankment and anchor installation on the anchor, and fixing the earth retaining panel to the anchor.