JPS6011175Y2 - Prefabricated retaining wall - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an earth retaining wall constructed to prevent the collapse of earth and sand, for example, in a developed area.

Conventional retaining walls of this type have generally been constructed by stacking concrete blocks on-site, as shown in Figure 1.

Specifically, the low-lying ground (LG) is excavated to an appropriate depth, chestnut stone 010 is leveled and compressed, the foundation formwork is assembled, foundation concrete 011 is poured, and the foundation concrete 011 is hardened. After that, the formwork is removed and the concrete blocks 012 are placed side by side in the horizontal direction.

After that, a back formwork is placed on the back of the concrete block 012 group and concrete 013 is poured.Next, when the concrete 013 has solidified to the extent that it does not collapse, the back formwork is removed and a back stone 014 (this is used for draining water) is placed. may be gravel or crushed stone.

), and then repeating the same process to stack concrete blocks 012 in multiple tiers to a predetermined height to construct the desired retaining wall. For retaining walls, most of the construction work must be done manually, and since concrete is poured repeatedly during construction, the setting time of the concrete results in a loss of time for the entire work, resulting in extremely poor construction efficiency. Not only that, it requires a lot of manpower, especially skilled workers due to the difficulty of mechanical construction, and it also requires a large number of materials used and brought in, and all of them are heavy.
It is very uneconomical as it increases the cost of transportation to the site and the cost of construction at the site.Furthermore, the scope of its application is narrow due to the construction procedure, materials used, etc.

In view of these circumstances, the present invention can be constructed in an extremely economical, efficient, and labor-saving manner by reducing the number of materials and types of materials used, reducing overall weight, and improving workability on site. Moreover, the purpose is to provide a prefabricated retaining wall that can be applied to a wide range of applications.

The prefabricated retaining wall according to the present invention consists of plate-shaped type 1 concrete blocks arranged in multiple stages in the vertical direction with appropriate gaps formed between the upper and lower adjacent ones along the appropriate slope slope, and in the horizontal and horizontal directions. At the same time, second type plate concrete blocks for earth retention are assembled in multiple rows with appropriate gaps between them, and second type plate concrete blocks for earth retention are assembled in upper and lower stages between the front ends of horizontally adjacent type 1 plate concrete blocks. The space formed by both types of concrete blocks is filled with earth and sand, and the first
The seed concrete block group and the earth and sand are connected through the frictional force of the earth and sand, and the entire filling earth and sand is continuous in the vertical and horizontal directions.

That is, the present invention fills earth and sand between plate-shaped concrete blocks placed side by side in an upright position, and mechanically connects the two through frictional force between the earth and the block plate surface, thereby eliminating earth and sand, which is the main cause of collapse. In addition to suppressing the horizontal movement of
Since the entire filled earth and sand can be made continuous vertically and horizontally, giving it the same flexibility as a dam, the necessary materials for constructing earth retaining walls and slope protection works are plate-shaped first,
Only Type 2 concrete blocks and earth and sand that can be easily obtained on site are required, reducing the number of materials and types of materials used compared to conventional methods, and the materials used have a simple structure and are very light, making them easy to handle. , and the foundation work can be simplified, making work on site significantly more efficient.
It can save labor.

Furthermore, since both types of concrete blocks are plate-shaped and there are no special restrictions on construction procedures, it is possible to diversify construction methods according to site conditions, etc., and the range of application is sufficiently wide. It has practical effects.

The embodiments of the present invention will be described below in detail based on Fig. 2 and below. Figs. 2 and 3 show the completed retaining wall,
This was constructed using the following construction procedure.

(1) Excavate the foundation ground, level the excavated soil surface to an approximately 5° slope, and compact it to an extent that prevents harmful subsidence.

In this case, if the soil bearing capacity is insufficient, appropriate soil improvement such as injection of a caking agent is carried out.

(2) On the leveled foundation ground, as the first layer, precast reinforced concrete type 1 plate blocks 1 are arranged in multiple rows with appropriate gaps left and right in the horizontal direction, so that the plate surfaces are vertical or almost vertical. At the same time, the first type plate blocks 1.
The second type plate block 2 for earth retention made of precast reinforced concrete is assembled with the front end wide parts 1a, 1a in contact and locked, and the earth and sand C is poured into the space formed by the two types of blocks 1 and 2 groups. is filled while compacting, and embanked at the top of the second type plate-shaped concrete block 2.

(3) After finishing the top surface of the first layer constructed as described above with a slope to the foundation ground and turning section, as the second layer,
The first type plate block 1 is placed with an appropriate slope slope (approximately 60 degrees) relative to the first layer, and a gap a of approximately 50 mm is formed between the upper and lower adjacent blocks. At the same time, after assembling the second type plate blocks 2 for earth retention in the left and right directions, the second layer is constructed by filling with earth and sand C in the same manner as in 2 above.

A retaining wall of the required height is constructed by repeating the construction work similar to the first and second layers several times, and the retaining wall constructed in this way is made of type 1 plate-shaped blocks. The first group and the earth and sand C are mechanically connected through the frictional force of the earth and sand, and the entire filling earth and sand C is continuous in the vertical and horizontal directions, and is in equilibrium with the surrounding tonosho.
Efforts are being made to prevent collapse.

It should be noted that the first group of type 1 plate-shaped blocks are designed so that the lower they are located, the larger the length in the front and back direction to reduce the vertical load on the lower earth and sand. The plate surfaces of the first group of type 1 plate-shaped blocks are roughened with unevenness to increase the frictional force with the earth and sand C.

Further, the first type plate block 1 is preferably made of precast reinforced concrete, but may be made of glass fiber reinforced concrete.

Figure 5 shows an ingenious way of stacking a group of type 1 plate blocks in the vertical direction. By adopting this so-called setback method, drainage performance in the retaining wall can be improved. In addition, it is possible to prevent damage due to contact between upper and lower blocks in the event of an earthquake, in other words, it is possible to increase the flexibility of the retaining wall. By forming vegetation such as trees, it is possible to green the slope of the retaining wall. Fig. 6 shows a modification of the first type concrete block 1, which is particularly suitable for filling the interior with soil and sand. This is advantageous when a block with a small friction angle must be used. Furthermore, FIG. This locking part has an arc-shaped curved surface structure, and if such a structure is adopted,
1st class concrete block 1 and 2nd class plate block 2
Even if the relative posture of the second type plate block 2 may slightly change from the designed posture due to construction errors, or even if there is a disturbance in the vertical posture of the second type plate block 2, the abutment locking portion It does not cause damage due to local stress concentration,
Therefore, there is an advantage that the construction accuracy is low and the construction efficiency is improved.

[Brief explanation of drawings]

The drawings show an embodiment of the prefabricated earth retaining wall according to the present invention. Figure 1 is a vertical side view of a conventional earth retaining wall, Figure 2 is a vertical side view of the earth retaining wall of the present invention, and Figure 3 is a side view of a conventional earth retaining wall. FIG. 4 is an enlarged plan view of the main part; FIG. 5 is an enlarged side view showing another embodiment; FIGS. 6 and 7 are also enlarged plan views of the main part showing different embodiments. It is. 1... First class concrete block, 2...
...Class 2 concrete block, C...Filled earth and sand.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ Plate-shaped type 1 concrete blocks 1 are stacked vertically in multiple tiers along an appropriate slope slope with appropriate gaps a between the upper and lower adjacent ones, and horizontally and horizontally. In addition to assembling them in multiple rows with appropriate gaps in the direction, the second type plate-shaped concrete blocks 2 for earth retention are placed vertically between the front ends of the first type plate-shaped concrete blocks 1, 1 that are adjacent in the horizontal direction. Assembled in multiple stages, these two types of concrete blocks 1,
The space formed by the two groups is filled with earth and sand C, and the first group of type 1 plate-shaped concrete blocks and earth and sand C are connected through the frictional force of the earth and sand. An assembly type characterized by being continuous in the direction■
The plate surface of the first group of type 1 plate-shaped concrete blocks is:
The prefabricated retaining wall according to claim 2, which has a roughened surface to increase the frictional force with earth and sand C. (2) The prefabricated earth retaining wall according to claim (2), wherein the first type plate-shaped concrete block 1 group is configured such that the lower the block, the larger the length in the front-rear direction. (2) The prefabricated earth retaining wall according to claim (2), wherein both types of concrete blocks 1 and 2 are reinforced.