JPS62153407A - Construction of artificial land in water - Google Patents

Abstract

PURPOSE:To construct an artificial land in a short time without the needs for coffering work with sheet piles, etc., by a method in which a place where an artificial land is to be constructed is surrounded by a cloth formwork, soil is heaped up in the water area surrounded, and a cloth formwork is set on the slope of the banking. CONSTITUTION:Cloth formworks 2 and 2a are vertically set on the outside of a place where an artificial land is to be constructed and supported by a float 1. A small amount of soil and sand 14 is dumped into the formworks 2 and 2a, and water with soil and sand is charged through a hose 6 into the central part of the left and right-handed cloth formworks 2 and 2a to heap up soil and sand 8. Soil and sand is also charged into the formworks 2 and 2a, the upper parts of the formworks 2 and 2a are made to come near each other, and the slope of the banking is covered with the formworks 2 and 2a. The needs for coffering work with sheet piles, etc., can thus be eliminated, and an artificial land can be constructed.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is aimed at constructing artificial land underwater, and belongs to the industrial field related to artificial land construction.

(Conventional technology) Conventionally, when reclamation on the coast, etc., after constructing a cofferdam by planting sheet piles etc. in predetermined locations, earth and sand was pumped from the outside into the cofferdam pronination using a Nando pump to create the land. Ta.

(Problems to be Solved by the Invention) According to the prior art, when constructing underwater land, in order to construct the outer enclosure, steel, sheet piles, or concrete sheet piles must be placed closely at the outer enclosure position. Therefore, not only did the pouring work require a large amount of work cost, labor, and time, but in order to bring in and take out the dredger, it was necessary to have complete entrance and exit facilities, and in order to make the sheet piles stand up on their own. teeth,
Hayata had some problems, such as requiring a driving depth proportional to the water depth, and the ground had to be able to withstand 1q.

(Means for solving the problem) However, this invention uses a fabric form instead of sheet piles, etc., and sequentially closes the fabric form by filling it with filler. It is possible to set a deadline, and the above problem has been solved.

That is, in this invention, a fabric form is vertically installed around the outer circumference of a planned artificial land construction position, and a filler is fed into the fabric form to fix the lower end of the form to the water bottom. Then, earth and sand are sent inside the area surrounded by the formwork and raised into the water. As the earth and sand are piled up, a slope of the earth and sand is formed, the earth is banked to a predetermined height, and the outer surface is reinforced to construct artificial land. In J3 mentioned above, if anchors are provided on the slope during embankment sand and the inclination of the fabric form is changed, the slope can be formed with significantly greater freshness than the angle of repose. Furthermore, if an agglomerate is mixed in when the earth and sand is heaped up, the embankment foundation can be made even stronger.

Further, the fabric of the fabric form is, for example, a fabric woven from synthetic resin fibers, and the weave is determined as appropriate. However, in order to make a formwork, two pieces of cloth are placed side by side at a predetermined interval (for example, 30 cm),
Place tensile materials at a predetermined interval between each opposing fabric, and make sure that the gap between the parallel fabrics does not become excessive when filling with earth and sand. Then, the lower end of the cloth form is placed along the water bottom, so the lower end of the cloth form is naturally settled.Also, the slope formed when embanking earth and sand is filled with the above-mentioned filler. By covering the cloth formwork, it can be reinforced very firmly, and if necessary, by laying concrete blocks on the covered cloth formwork, it can be reinforced even more firmly.

Possible fillers for the cloth formwork include earth and sand, gravel, or concrete. In addition, for embankments, earth and sand are pumped out using sand pumps or transported from the extraction site to the required location using transport vessels. Normally, cloth formwork is arranged in a ring shape to form an outer enclosure, or an arcuate outer enclosure is created toward the coast, or the coast and an offshore island are connected and earth and sand is piled up in the middle. It can be used in place of construction works that are known to have deadlines such as.

(Function of the invention) This invention uses a cloth formwork, so when fixing the formwork on the bottom of the water or covering the slope of an embankment, simply unroll the cloth, fill it with the necessary filler, or The cloth formwork is installed in a predetermined position simply by moving the float. Further, since the upper end of the fabric form is supported by the float, it can be cut off from the float or connected with a weight to sink the upper end of the form into the water.

(Example) A large number of floats 1.1a are connected to the outside of the planned artificial land construction position to support one side of the fabric form 2.

The cloth formwork 2 is covered with synthetic resin woven cloth 3.3a at predetermined intervals.
For example, 30 cm 2 ) are opposed to each other, and tension lines 13 are fixed at regular intervals to prevent excessive expansion.

The upper end of the woven fabric 3.3a is wound onto a winding shaft 4.4a to a required length, and is unwound as required. Once the fabric form 2.2a is laid in the planned water area as described above, first, the dredger 5 uses a hose 6 to force the earth and sand 14 together with water into the fabric form 2.2a. do. (5) The water that has entered the formwork 2.2a is discharged to the outside through the fabric, so that only the sand 14 eventually accumulates below the can formwork 2.2a as shown in FIG. Then, the float 1.1a is moved slightly, the can form 2.2a is let out by the required length, and the lower end of the earth and sand part is placed on the water bottom 7. Once the outer circumference of C1 has been secured in this way, the ends of the hose 6 from the dredger 5 are positioned at the center of the left and right formworks 2.2a as shown in Figure 3, and the earth and sand water is transferred. is excited as shown in Figure 3. As described above, when the outer lower part of the earth and sand embankment reaches the fixed part of the can form 2.2a, earth and sand water is also supplied to the can form 2.2a, and the can form 2.2a is also supplied with earth and sand water.
While paying out some of 2a, move it slightly closer to cover the part filled with earth and sand onto the earth and sand embankment slope. By repeating the above operations, when the planned height is almost reached as shown in Fig. 4, concrete blocks 9 are laid on top of the earth and sand can formwork 2.2a, and bank protection blocks 10 are constructed as necessary. Then, the earth and sand are piled up to complete artificial land 11.

In the above, as shown by the chain line in FIG. 3, the anchor 12 can be installed in a part of the can form to make the covering angle steeper. Further, it is also possible to promote the consolidation of the earth and sand by injecting an agglomerate or cement mortar into the earth and sand. In the embodiments described above, the earth and sand were transferred from a dredger using a hose, but it is also possible to use an earth and sand transport vessel to transport the earth and sand by water. It is also possible to transport gravel, etc. to a predetermined location using a conveyor (float support). In such cases, a waterway can be easily created by letting the float sink. That is, the method of the present invention can be used for artificial land construction when constructing artificial islands, underwater embankments, and other structures of required area and height.

(Effects of the Invention) That is, in this invention, an outer enclosure is constructed underwater using a can form, and earth and sand are discharged into the outer enclosure to create an artificial land. It has various effects such as being able to build a large scale in a short period of time. Furthermore, since it is a can form, it is extremely easy to fix and move, and there are also practical benefits such as the can form can be used as a reinforcing coating at the end of construction.

Secondly, since the method of the present invention does not require a high level of skill, any worker who has mastered the prior art can easily and quickly carry out the work.

[Brief explanation of drawings]

FIG. 1 is a plan view of the construction of an outer enclosure in an embodiment of the present invention;
Figures 2 to 5 are diagrams showing the construction sequence of the present invention, where Figure 2 is a side view of can formwork installation, Figure 3 is a side view of the start of earth and sand embankment, and Figure 4 is reinforcement on earth and sand embankment slope. Figure 5 is a side view of the completed artificial land, Figure 6 is a partially enlarged side view showing the support state of the can form according to the present invention, and Figure 7 is a part of the same can form. The enlarged perspective view and FIG. 8 are also partially enlarged perspective views when the can form is filled with earth and sand. 1.1a... Float 2.2a... Can formwork 4.
4a... Winding shaft 5... Dredger 7... Underwater
8... Earth and sand 9... Concrete block Figure 2 73143a Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A fabric form is installed vertically around the planned location of artificial land construction, and a filler is introduced into the fabric form to fix the lower end of the form to the water bottom. Then, earth and sand are sent inside the area surrounded by the formwork and raised into the water. An underwater artificial land construction method 2 characterized by forming a slope of embankment sand as the earth and sand is piled up, embanking to a predetermined height, and reinforcing the outer surface.For forming the slope, anchors are installed in the formwork. 3. A method for constructing artificial land in water according to claim 1, in which the slope is steeper than the angle of repose. Land construction method 4: A patent claim in which the fabric formwork is a woven fabric made of synthetic resin fibers, which are placed facing each other at a predetermined interval, their lower ends are connected to each other, and tension members are fixed to the opposing fabric at a predetermined interval. range 1
Underwater artificial land construction method 5 according to Claim 5 The underwater artificial land according to Claim 1, wherein the external reinforcement is performed by covering a formwork filled with earth and sand, or by laying concrete blocks on the covering. Construction method 6 A method for constructing artificial land in water according to claim 1, in which the filler is earth, sand, gravel, or concrete 7 A patent in which the earth and sand for heaving is transported by force using a sand pump or transported by a carrier ship 8. Method for constructing artificial land in water as described in claim 1 8. Method for constructing artificial land in water as described in claim 1, in which the fabric form is installed in a circular or encircling shape.