JPH07102507A - Method for constructing earth retaining wall - Google Patents

Abstract

PURPOSE:To construct an earth retaining wall without largely modifying the ground where the earth retaining wall is constructed so that construction period is shortened and economical efficiency is improved. CONSTITUTION:After a PC anchor 2 and a foundation concrete 4 are constructed at a desired position of an inclined ground 10, precast concrete boards 5 are assembled on the concrete 4 to a specified height. A tension is imparted horizontally to the boards 5 by means of a PC cable to form a wall into an integral construction. Further the boards 5 in the form of integral construction and the PC anchor 2 are connected together and concrete is cast at the point of the connection to form an anchor beam 6, and a tension is applied into between the anchor 2 and the boards 5 by means of a PC steel bar 12 to form the boards 5 integrally with the ground 10. If a bank is formed in a space between the boards 5 and the ground 10, a road surface is formed on the bank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a retaining wall for retaining soil without excavating the sloped land in the case of widening the road surface such as railroads and roads provided on the steeply sloped ground, or newly constructing the road surface on the steeply sloped ground. Related to the construction method of the retaining wall for retaining the soil that is used to build the road and forms the road surface above it.

[0002]

2. Description of the Related Art Conventionally, a method of constructing a large-scale foundation concrete on a sloping ground and then forming a retaining wall with blocks and concrete has been mainly used as a soil retaining wall for sloping ground. Reinforced soil retaining walls, which reinforce the soil behind the retaining wall with reinforcement materials, have been widely adopted as the scale of the site expands.

[0003]

However, the above-mentioned conventional method requires excavation of a sloping land and large-scale construction,
In addition, since the reinforced soil retaining wall requires large-scale improvement of the soil behind the retaining wall, the construction site is limited, and there are problems in terms of construction period and economy. The object of the present invention is to
An object of the present invention is to provide a construction method of a soil retaining wall that can be constructed without adding large-scale processing to the earth retaining wall to construct the soil retaining wall and has an excellent construction period and economy.

[0004]

[Means for Solving the Problems] In order to achieve the above object, the means adopted by the present invention is to increase the width of a road surface at a required height position on a slope or to form a road surface at a required height position on a slope. In the construction method of the soil retaining wall where the soil retaining wall is constructed on the valley side of the road surface and the road surface is formed above it.
A step of constructing PC anchors at a predetermined interval in the road surface extension direction on the valley side slope of the road surface position, a step of placing foundation concrete in the road surface extension direction to the valley side from the PC anchor construction position, and the foundation After prefabricated precast concrete boards were installed side by side in the road surface extension direction on concrete, the precast concrete boards were horizontally installed between the PC anchor installation intervals.
After the process of applying tension with a cable and connecting the precast concrete plate and the anchor with a PC steel rod,
A step of placing concrete at the connecting position and then applying tension to the PC steel rod to form an anchor beam, and constructing a U-shaped soil retaining wall in plan view; And a step of forming a road surface by applying embankment to a space between the sloped land and the earth retaining wall. The order of the above steps can be changed in various ways as long as they do not conflict. When forming the earth retaining wall high, a step of applying tension with a PC steel rod in the vertical direction is also added after stacking the pressed cast concrete plates in multiple stages.

[0005]

In the construction method of the soil retaining wall according to the present invention, after the step of constructing the PC anchor and the basic concrete at the required position on the sloping ground, the precast concrete plate produced in the factory in advance on the basic concrete is assembled to a predetermined height. . After that, the assembled precast concrete board is horizontally tensioned by a PC cable to integrate the wall, and the precast concrete board with the strengthened integration and the PC anchor are connected, and this connection is made. The precast concrete plate and the sloping ground are integrated by placing concrete at the position to form an anchor beam and applying tension between the PC anchor and the precast concrete plate with a PC steel rod. When constructing the precast concrete board high, the tension of the PC cable in the horizontal direction and the tension of the PC steel rod in the vertical direction are also applied to strengthen the wall integration.
The formation of the anchor beam is constructed at both ends of the wall by the integrated precast concrete plate, or both ends and the middle part, and the anchor beam and the wall form a U-shaped structure in plan view, Earth pressure against. If the number of anchor beams is increased to further increase the strength, it is possible to deal with slip failure on the entire slope.
When embankment is applied to the space between the precast concrete plate constructed as above and the slope, a road surface is formed on the upper surface of the embankment. According to this method, it is not necessary to excavate a sloping land when constructing a retaining wall to construct a road surface, the construction period is shortened compared to the conventional method, and an economical retaining wall can be constructed. Done.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings for the understanding of the present invention. The following embodiments are examples of embodying the present invention and do not limit the technical scope of the present invention. 1 is a partial perspective view of a soil retaining wall constructed by the embodiment method of the present invention, FIG. 2 is a plan view (a) and a front view (b) of the soil retaining wall according to the embodiment, and FIG. It is a mimetic diagram showing an example construction method for every process in order. In FIG. 1, the soil retaining wall 1 constructed by the construction method of this embodiment is a retaining retaining wall for widening the existing road 11 already provided on the sloping ground 10 to a road (road surface) width according to the widening plan. It is built as 1. As shown in the figure, a concrete wall 9 made of precast concrete plate 5 up to the height of the existing road 11 is formed along the existing road 11 on the slope on the valley side of the existing road 11. Anchor beam 6 is formed between and. These concrete walls 9 and anchor beams 6,
Furthermore, since the soil retaining wall 1 in which the sloping ground 10 is firmly integrated is constructed, the concrete wall 9 and the anchor beam 6
When embankment is applied to the space formed between the slope and the slope, the existing road 11 is widened according to the widening plan.

Each step of the construction method of the soil retaining wall 1 will be described below in order. However, the order is not limited to the following process sequence, and the sequence can be changed according to the condition of the site, construction scale, construction plan, and the like. Figure 3 (a)
Is a cross section of the slope 10 showing a state before construction in which the existing road 11 is formed by excavating the slope 10. First, Fig. 3
As shown in (b), the PC anchor 2 is installed on the valley side slope of the existing road 11. Regarding the construction position of the PC anchors 2, the installation intervals of the anchor beams 6 are determined based on the strength calculation according to the road surface widening plan, and the plurality of rows of PC anchors 2 corresponding to the height of the concrete wall 9 are constructed. Each of the PC anchors 2, 2 ... Is provided with a coupler 3, 3 ... For connection with the concrete wall 9 at the boundary with the inclined surface.

Next, as shown in FIG. 3 (c), a foundation concrete 4 is placed on the valley side from the position of the constructed PC anchor 2 in order to level the slope 10 on the ground. A precast concrete board 5 is installed on the basic concrete 4 as shown in FIG. 3 (d). Precast concrete 5 has a length of 2m, which was previously manufactured in the factory.
It is a concrete plate with a width of 4 m and a sheath is provided in the vertical and horizontal directions. As shown in FIG. 2, P is attached to the lateral sheath.
The precast concrete plates 5 arranged in the horizontal direction through the C cables 7, 7 ... Are tensioned by a post tension method to integrate them as a concrete wall 9. The figure shows a state in which the precast concrete boards 5 are stacked in two stages. However, when building a high concrete wall 9 by stacking in three or more steps, the PC anchor 2 is constructed and the precast concrete boards 5 are tensioned in the horizontal direction. Repeating the process, the PC steel rods 8, 8 ...

Next, as shown in FIG. 3 (e), the concrete wall 9 formed as described above and the PC anchor 2 are connected by a connecting PC steel rod 12, and concrete is poured into this connecting position. Then, the anchor beam 6 is formed. In the case of the present embodiment, this anchor beam 6 is made up of three or more precast concrete plates 5 each having a width of 4 m, as shown in FIG.
It is formed at intervals of 12 m to 16 m in length for every four arranged. Increasing the number of anchor beams 6 formed will increase the slope 10
The strength against overall slip failure can be increased. After the concrete placement of the anchor beam 6 is stabilized, tension is applied by the connecting PC steel rod 12 connected to the PC anchor 2 to strengthen the integration of the concrete wall 9, the anchor beam 6 and the sloping ground 10. Above concrete wall 9
The space between the existing road 11 and the concrete wall 9 is filled by applying embankment to the U-shaped space formed by the anchor beam 6 and the widened road surface. By constructing the pavement on this road surface and incidental equipment such as guardrails, a road according to the widening plan is completed. In the construction method of the soil retaining wall 1 according to the present embodiment, the road surface can be widened without making any improvements such as newly excavating the sloping ground 10 as described above, and thus the construction period can be shortened and the economy can be improved. You can plan to secure the strength that suits your condition. In addition, although the said Example showed the example of construction of the earth retaining wall 1 for widening of a road, even when a road surface, such as a road, is newly formed in the slope 10, excavation of the slope 10 by the same procedure. Instead, the retaining wall 1 can be constructed and the road surface can be formed above it.

[0010]

As described above, according to the present invention, when constructing the earth retaining wall and forming the road surface, it is not necessary to excavate the sloping ground, the construction period is shortened as compared with the conventional construction method, and the economical efficiency is improved. Also, an excellent retaining wall will be constructed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a structure of an earth retaining wall formed by a method of constructing an earth retaining wall according to an embodiment of the present invention.

FIG. 2 is a plan view (a) and a front view (b) showing a structure of a soil retaining wall according to an embodiment.

FIG. 3 is a schematic view showing each step of the construction of the retaining wall for retaining soil according to the embodiment in order.

[Explanation of symbols]

 1 ... Soil retaining wall 2 ... PC anchor 4 ... Basic concrete 5 ... Precast concrete plate 6 ... Anchor beam 7 ... PC cable 8 ... PC steel rod 9 ... Concrete wall 10 ... Sloping ground 11 ... Existing road (road surface) 12 ... PC for connection Steel rod

Claims (2)

[Claims] 1. A soil retaining wall is constructed on the valley side of the road surface position above the road surface position in order to widen the road surface at the required height position of the sloping ground or form the road surface at the required height position of the sloping ground. In the construction method of the soil retaining wall that forms the road surface, a step of constructing PC anchors on the valley side slope of the road surface position at a predetermined interval in the road surface extension direction, and a road surface extension direction on the valley side from the PC anchor construction position. After placing the precast concrete boards on the foundation concrete in a line extending in the road surface extension direction, the precast concrete boards are horizontally placed between the PC anchor construction intervals. After the step of applying tension with a PC cable and connecting the precast concrete plate and the anchor with a PC steel rod, concrete is placed at the connecting position. A step of forming an anchor beam by applying tension to the PC steel rod and then constructing a U-shaped soil retaining wall in plan view, and a space between the soil retaining wall and the slope And a step of forming a road surface by applying embankment to the soil retaining wall. 2. The method for constructing a retaining wall for retaining earth according to claim 1, wherein after the precast cast concrete boards are stacked in multiple stages, tension is applied in the vertical direction with a PC steel rod.