JPS6164911A - Steel plate cell type revetment - Google Patents

Abstract

PURPOSE:To form highly safe and highly stiff revetment by a method in which steel plate cells are penetrated into the bottom ground under water, and water- granulated slags and an alkaline substance as a stimulator for the hardening of the slags are packed into the cells. CONSTITUTION:Steel plate cells 3 are penetrated into the treated soil 4 formed by mixing a ground improver with cohesive soil 5 on the support sandy layer 6 of the seabed. A filling material 2 prepared by mixing water-granulated slags with about 10% (based on the slag) Portland cement is packed into the cells 3, and top concrete 1 is then placed. Since the hardening of the slags is promoted to exhibit great resistance forces in a short time, low-cost, highly safe and highly stiff revetment can be formed.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to seawall structures in ports, rivers, etc., particularly structures in which a filling material is optically cut into seminal root cells whose lower ends penetrate into the ground at the bottom of the water. The present invention relates to a seawall that is lighter and less expensive, has excellent vulnerabilities, and has an extremely high level of safety by using a new filling material.

<Prior art> When constructing seawalls in ports and rivers, the lower ends of cylindrical cells made of steel plates (including steel sheet piles) are penetrated into the supporting ground at the bottom of the water, and structures are constructed in which filler material is filled in the cells. The cell construction method of forming a desired bank by arranging them in rows is well known, needless to be exemplified. The filling material to be filled into the 7t egg cell is based on Port Structure Design Standard 4 (,
As is well known, it is customary to use natural sand such as river sand.

<Problems to be Solved by the Invention> In the prior art, natural sand is simply poured into the cell through the opening at the top after entering the cell, and therefore the cell cannot resist tensile force during an earthquake, which prevents the cell from collapsing. Not only is there a high possibility that S2 is suitable in terms of rigidity and safety, but the amount of natural sand that can be extracted is decreasing year by year, and the cost is relatively high. Furthermore, the unit electricity of natural sand is 1
．． 6t/=, which means that the total weight is large for a cell construction method revetment, and therefore there are problems in that the amount of consolidation settlement of the underwater support ground Q1 is large.

The present invention solves the above-mentioned problems caused by using natural sand for filling (e), and can be obtained at a lower cost. By developing and curing integrally within the cells, it is possible to easily create a more rigid and safer seawall.This purpose was achieved by adopting the following technical means. It can be achieved.

That is, the technical means is to use granulated slag and a stimulant to accelerate the hardening of the slag when constructing a seawall by optically cutting filler material into steel plate cells whose lower ends penetrate into the underwater ground. Each time a filling material is used with an alkaline substance.

<Function> As is known, the granulated slag in the technical means of the present invention is blast furnace slag in type iron, 5#f4 industry, and its components are Ca04L, 0%, 5i0233.4%, 31.0
%, Fe2 03 0.4%, MgO6.0%, 81
The granulated slag consists of 14.5% of 2203 and 3.7% of undissolved residue, and this granulated slag has latent hydraulic properties.

Here, the term "latent hydraulic property" refers to the property that either it does not develop hydraulic properties even if it comes into contact with water, or it begins to harden when exposed to an alkaline atmosphere, such as Ca (Oll) 2. Therefore, when such granulated slag is hardened, it is necessary to add an alkaline substance (alkaline irritant). The effect of the added alkaline stimulant is to cut the 5i04 network forming the glass structure in the slag component, and once the network cutting starts, the CaO and M[0 Alkaline substances such as these are eluted and an alkaline atmosphere is maintained. Therefore, the network continues to be disconnected, and the dissolution of the glassy substance in water progresses, and the eluted CaO1Si02,
Aj22Ch and the like cause a hydration reaction similar to that of cement, and the slag itself hardens.

As mentioned above, granulated slag! In case of 11 taste, the onset of hardening is slow and the strength cannot be expected within 3 months. Its curing is significantly accelerated by adding 4
Uniaxial strength of about 30 kg/cr& can be expected at a timber age of about a week.

The present invention takes advantage of the latent hydraulic properties of granulated slag and uses it as a filling material in steel plate cells. After pouring, the granulated slag discharged as blast furnace slag from a steelworks, etc. is transported to the revetment construction site by appropriate means of transportation, and the granulated slag is mixed with granulated slag in an amount of about 10% of the slag amount. For example, by mixing ordinary Portland cement and filling it into the cells as a filling material, the granulated slag begins to harden, and the entire filling material becomes a rigid body that hardens as one.
It also connects with the supporting ground at the bottom of the water, and compressive force applied from the outside world.
Together with the steel plate cells that form the shell, it exerts a strong resistance to both shearing force and tensile force, and this can only be obtained by filling, which is different from the conventional method of filling with natural sand. This means that it is possible to construct a seawall that is highly rigid and safe at a lower cost.

<Embodiment> One of the standard embodiments of the seawall of the present invention will be explained with reference to Fig. 1.2. In Fig. 1, 3 is a steel machine cell, and the example shown in the figure shows a cylindrical cell made of steel plate, but this is made by arranging a large number of finger arrows in a row to form a cell with a desired cross-sectional shape. The same is true for those that do, J). Such steel plate cells 3 are placed in the position where the target seawall is to be constructed, for example, in a seawall at a port, the clay layer 5 is placed on the seabed supporting sand layer 6.
, mix 1 ul of soil conditioner, such as quicklime, into the clayey soil layer. After pouring into the deep mixing treatment (which is a known 11HI improved technology) ±4 so that its lower end is penetrated and fixed, granulated slag and 10 of the slag amount are placed in the steel plate cell 3. After filling the filling material 2 of the present invention mixed with Portland cement in an amount of about 10%, a canopy concrete 1 is placed on the cell top α1;1.

Of course, the seawall is not constructed from only one steel plate cell, and an example of such a seawall is shown in Figure 2.

In Figure 2, 11'71 is shown. VI I
F: 1: The cells 3 are lined up in a straight line with medium blades. In this figure, the same reference numerals as in Fig. 1 indicate the same structures and evil spirits, and each steel plate cell 3 is The granulated slag and the slag 1 (
1% A and 11, Portolan ljl men day, two people? ) Filling material 2 is filled, and arc portion cells (known) 7 are poured into the gaps between the cells 3 arranged side by side as shown in the figure. The material 2 is also placed inside the arc section self. In the figure, 8 is the reclaimed land to be created behind the seawall, and 9 is the upper concrete 1 to be poured on the large cover concrete 1. As in ttrt ha, the φ of the micelle is 20m and the height is 30m.
, Cef 1} thickness is 161, the height of the arc part self is 24 m, the cell plate thickness is 12 pieces, and the deep mixed treated soil 4 penetrated by cell 3.7 is 18. 5
It is constructed with a width of 45 m and extends over m positions.

Of course, the shape of the seawall is not limited to just a single row or a straight line, but it is also possible to arrange the steel plate cells 3 in any double row or curved shape. When filling the filling material 2 according to the present invention into the arc section self, as shown in FIG. Do not feed the duck and cement alternately through the chute 11, the cement hopper or the cement hopper 12.
(Also, as shown in Figure 4, the known earth pressure fl
A, use the fracking slack transport vessel 13, (lmen 1 to transport vessel 14), and use the onboard loading equipment 15 such as σ1 [crumb tank 1-1] to alternately input the fracking slack in the same way. Also, during immersion and filling, the cell can be selected arbitrarily depending on the conditions of the work site so that stability can be ensured using hoop tension means.

<Effects of the Invention> According to the present invention, the present invention has the following major advantages over conventional bays (anti-cell groove structures) using natural sand.

The granulated slag used in the present invention differs from natural sand, which is subject to yearly restrictions on extraction conditions, and succumbs to the waste that is routinely discharged in the iron and steel industry.
It is advantageous in terms of cost, and even unpulverized slag can be used as is. Moreover, since this filler material 2 has the same strength as natural sand even before hardening after being filled into the steel plate cells, there will be no practical concerns at all. And after self-hardening by adding an alkaline substance (cement),
It functions as a completely rigid body within the cell, exhibiting strong resistance to compressive force, shearing force, and tensile force from the outside world together with the cell, and is highly earthquake resistant and far more resistant to natural sand. In addition to providing high rigidity and safety, granulated slag has a light unit volume weight of 1.1 t/-, so it is lighter than natural sand for cell revetments, and this makes it easier to support earthen structures. Consolidation settlement ■ can be reduced, there is no risk of defects such as uneven settlement of the revetment structure, and even during construction, γ6. Mika does not need to be mixed with granulated slag, and is used to maintain an alkaline atmosphere inside the cell to promote hardening (promote the development of hydraulic properties in slag), so it can simply be mixed with granulated slag, cement, etc. If they are put into the cell alternately, there is no need for mixing and agitation, but the construction is not an example, and the results of the implementation are 1.
By adding 0% cement, the slag will definitely self-harden.
After 2 to 3 months, the strength will be comparable to that of concrete 1, and the unconfined compressive strength will be 100 kg/cA or more, and the cells will be used as formwork, with the inside being a geson-like cell similar to that of lightweight concrete. In terms of design, it can be said to be a simpler and more reliable construction method that is superior to the conventional construction method, which uses natural sand as a filling material, and has opened up new possibilities for cell revetments for various purposes. As a thing (something that was supported).

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a forceps single-plate cell structure according to the present invention;
Figure 2 is a slope view including a partial cross section of the same seawall, as shown in Figure 3.4.
The figures are each explanatory diagram of the filling material charging means. 1 = - canopy concrete, 2 - filling material, 3 - steel plate cell, 4 - deep mixed treated soil, 5 [occupied soil layer, 6 - supporting sand layer. ≦7 口′°・3′l Figure 2;

Claims (1)

[Claims] 1. When constructing a revetment with a structure in which filler is filled in steel plate cells whose lower ends penetrate into the underwater ground, a medium is used that uses granulated slag and an alkaline substance as a stimulant to accelerate hardening of the slag. A steel plate cell type seawall characterized by the use of filler.