JPH0434108A - Bank body structure - Google Patents

Abstract

PURPOSE:To expedite the construction by piling up a self-supportable stabilized earth in which a consolidating agent is mixed with earth and sand on the foundation part of the ground, and providing a cover member on the surface. CONSTITUTION:A foundation part 3 is formed on the sea bottom by a rubble- mound 2, a stabilized earth 4 is piled up on the foundation part 3, and a cover member 5 is provided on the surface of the stabilized earth 4 to construct an inclined bank 1. In this case, the self-supportable stabilized earth 4 in which a consolidating agent is mixed to earth and sand is used as a main material. The economical property thus can be improved.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an embankment body structure suitable for breakwaters, jetties, and the like.

(Prior Art) This type of embankment body includes, for example, a breakwater, a seawall, a dike, a water gate, a seawall, an embankment, a jetty, etc., and is used to ensure the safety of ship berthing and cargo handling, as well as various port facilities and ancillary facilities. It is installed to ensure safety.

A wide variety of levee structures have been considered, including shapes, functions, and materials, depending on the specific functions of each levee body. FIG. 5 shows a typical structural example of a conventional slope embankment.

The sloping embankment a in the figure is constructed by loading rubble stones C on the foundation of the ground and covering the surface of the rubble stones C with a covering material d. It can be roughly divided into mixed types, etc. In this way, embankment structures mainly made of rubble are often used particularly in shallow water areas because they can be constructed without being affected by the irregularities of the seabed ground and the construction process is relatively simple. has been done.

(Problems to be Solved by the Invention) Recently, however, rubble stone itself has become increasingly scarce, and it is often difficult to obtain it near the site. In addition, rubble materials come in a wide variety of sizes and shapes, and they range in weight from several dozen to over 100 kg, making loading and unloading, transport vehicles, and construction machinery larger. Moreover, since it is difficult to form a bank into a predetermined shape, there are problems such as poor economic efficiency and workability, and the inability to handle rapid construction.

The present invention solves the above-mentioned problems and aims to provide an embankment structure that can reduce both construction period and construction cost.

(Means for Solving the Problems) In order to achieve the above object, the embankment structure of the present invention embanks self-sustainable stabilized soil, which is prepared by mixing soil and sand with a consolidation material, on the foundation of the ground, and It is characterized in that a covering member is provided on the surface of the stabilized soil.

(Function) According to the above structure, since the main material is stabilized soil that can stand on its own, which is made by mixing soil and compaction material, it is advantageous in terms of transportability, ease of construction, etc. compared to rubble stone, and It also facilitates quick construction.

Note that the present invention requires stably treated soil that can be self-supporting and is prepared by mixing soil and sand with a consolidating material.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing a slope to which the embankment structure of the present invention is applied. The slope 1 in the figure was built in a water depth of several meters for the purpose of wave prevention. A foundation 3 is formed on the seabed with rubble 2, and stabilized soil 4 is heaped on top of the foundation 3. In addition, the structure has a coating member 5 installed on the surface of the stabilization treatment ±4.

Here, the stabilizing material 4, which is the main part of the present invention, is made of earth and sand mixed with a consolidation material. Specifically, it is a mixture of local earth and sand and compaction material, which has a particularly high self-supporting strength (approximately 4 to 6 kg/mouth), and satisfies design conditions such as unit weight, water permeability, and economic efficiency. In addition, cement or the like can be used as the solidifying material.

As for the mixing treatment conditions, the amount of cement is 50 to 70.
It is preferable to use kg/m3 as a guideline, water amount in a naturally moist state, and compaction degree as a compression ratio of 15 to 25%.

Next, an example of construction of the slope 1 will be outlined with reference to FIGS. 2 and 3. Note that FIGS. 2 and 3 are schematic cross-sectional views showing the construction process of the slope. Furthermore, the foundation part 3 is constructed by heaping it up using conventional offshore construction.

FIG. 2 shows the step of providing the first stage.

Here, the foundation part 3 is being constructed, a formwork 6 is installed at a predetermined location on the foundation part 3, and stabilized treated soil 4 is put into the formwork 6 to form the first stage 4a. During construction, the number of stages, block size, etc. are designed together with the construction cycle, with the preceding part being used as a work scaffold, and the amount of stabilized soil 4 to be used for each number of stages is determined.

A simple formwork made of wood is used as the formwork 6, and is assembled and installed on the foundation part 3 to a predetermined size. In the actual construction, the soil at the site is sifted and thrown into a mixer truck using a backhoe, and the mixed material is piled into the formwork 6 using a truck crane.

Figure 3 shows the construction of the second stage 4b. After loading the corresponding covering stone 5 on the outside of the first stage 4a, an outer frame 6 is installed on the covering stone 5, and a stabilizing treatment ±4 is applied. It is in an upright position. In this case, when constructing from the second stage, the previous stage can be used as a scaffold, which improves work efficiency.

Further, by sequentially and repeatedly constructing a plurality of stages on top of the second stage 4b, the slope 1 shown in FIG. 1 can be obtained. Incidentally, the covering stone 5 is provided at each stage 4a.

4b... may be loaded after construction.

FIG. 4 shows a second embodiment of the present invention, in which stably treated soil is used for all cases where the water depth is shallow.

In other words, the slope 10 in the figure was built in shallow waters with a water depth t of approximately 1 m or less for the purpose of wave prevention, and stabilization treatment ±40 was applied directly to the seabed using a light temporary cofferdam. The construction will be carried out in heaps using land-based construction equipment. In addition, code 5
0 indicates a covering member.

In the above-mentioned embankment structure, stably treated soil 4,40, which is a mixture of soil and compaction material, is used instead of conventional rubble, making it easy to obtain the main material and also to shape it. Become.

The present invention is not limited to the above-described embodiments, but can be variously modified or developed within the scope of its gist.

(Effects) As explained above, the embankment structure of the present invention uses as the main material stably treated soil, which is a mixture of earth and sand with a consolidating material, so it is easier to construct than rubble stone. Since this is a good thing, it is possible to shorten the construction period, and it is also possible to reduce construction costs because transportation costs are reduced. In particular, the construction material, earth and sand, does not run out and is readily available locally, allowing for quick construction.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a slope embankment showing an embodiment of the present invention, FIGS. 2 and 3 are schematic cross-sectional views showing the construction process of the slope bank, and FIG. 4 is a schematic cross-sectional view showing another example of the slope bank. A schematic cross-sectional view showing
FIG. 5 is a schematic cross-sectional view showing a slope embankment as a conventional example. 1.10...Slope embankment 3...Foundation part 5.50...Covering member 4.40...Stabilized soil/formwork

Claims (1)

[Claims] (1) An embankment body structure characterized in that self-supporting stably treated soil, which is prepared by mixing earth and sand with a consolidation material, is piled up on the foundation of the ground, and a covering member is provided on the surface of the stably treated soil.