JP3810164B2 - Landfill method using pre-mixed soil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for landfilling a water area using premixed treated soil.
[0002]
[Prior art]
In recent years, when constructing a structure on an artificial island that reclaims offshore waters or a landfill in shallow coastal waters, landfill with premixed soil has been performed.
In the landfill method, even if the landfill material mixed and prepared on land is transported to the target sea area by means of an earth ship (barge) or the like, the loading capacity is large and time is required for loading work. In order to solidify, conventionally, a fleet composed of a plant ship and a driving ship is usually formed in the sea area, and landfill is performed by this mixed plant fleet.
[0003]
However, offshore plant ships have the disadvantage that the operating rate of the plant decreases due to weather and sea conditions, so it was necessary to install large facilities in the sea area in anticipation of this reduced operating rate in advance. . In addition, ships with large facilities require time for maneuvering and positioning, and due to the construction space in the sea area, it was difficult to simultaneously load multiple sets.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a landfill method using premixed soil that is excellent in economic efficiency by efficiently performing landfill work without preparing a large-equipped ship.
[0005]
[Means for Solving the Problems]
The landfill method using the pre-mixed treated soil according to the present invention includes a floating conveyor continuously connected from the land portion to the planned landfill area, and a mixing means is provided in the connecting portion of the conveyor, so that the earth and sand and the solidified material are removed from the land portion. It is characterized in that it is mixed and prepared at the same time as being transported to form a pre-mixed treated soil, which is thrown into the water area.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. First, a premixed processing embankment method will be described.
[0007]
As is well known, the pre-mixing embankment method is to add a premixed material, anti-separation agent, clay, etc. in advance to landfill, backfilling, filling sand, etc. It is a construction method that creates a stable ground by transporting and feeding it to the site.
The pre-mixing embankment method has advantages such as (1) no need for ground improvement after landfill construction, (2) large-scale construction and deep water construction.
[0008]
The premixing embankment method is roughly divided into a slurry embankment method and a dry embankment method. The slurry embankment method is a slurry or mortar material produced by mixing soil material, solidification material, admixture, and water. The dry embankment method is a non-fluid granular material produced by mixing soil material, solidification material, admixture material, and water in water. It is a method of throwing in, descending, landing, and depositing.
[0009]
As the solidifying material, cement is usually used. Further, the separation preventing agent is used for preventing separation of earth and sand from cement in water, and an aqueous solution of strong anionic polyacrylamide or the like is used. The addition rate of cement and anti-separation agent should be selected so as to obtain the optimum blending amount in consideration of the type of earth and sand and other construction conditions. For example, when the target strength is 2 kg / cm ² , the composition per 1 m ^{3 of the} premixed soil is 1300 kg of earth and sand, 120 kg of cement, and 1 kg of the separation inhibitor.
[0010]
The dry embankment method is usually carried out in the order of transporting soil material, mixing solidification material, adding antiseparation agent, transporting treated soil, charging and landfilling, but the present invention transports soil material and solidification material, And its mixing method. Therefore, the case where the sea area is reclaimed by the dry embankment method will be described in detail.
[0011]
In FIG. 1, a land conveyor 14 is installed in the land portion 10, and floating conveyors 20, 20, 20 are continuously connected to a planned landfill area 30 through a connection conveyor 16. The floating conveyor 20 is a type of conveyor in which a belt conveyor is mounted on a carriage 22. A tripper conveyor 24 and a spread conveyor 26 mounted on a carriage 22 are connected to the end point of the floating conveyor 20, and are introduced into a planned landfill area 30 from an underwater placing chute 32.
[0012]
At the connecting portion of each conveyor, earth and sand and solidifying material mixing means 34 are provided, so that the earth and sand and the solidifying material are mixed during the transportation process to prepare premixed soil. Since the transportation time by the belt conveyor is much shorter than that by ship, the earth and sand and the solidified material are not solidified during the transportation process. The mixing means 34 is not particularly limited, and a known damper chute, continuous mixer or the like can be employed.
[0013]
In the land part 10, the measured earth and sand and the solidified material are received by the hopper 12 and supplied from the hopper 12 to the land conveyor 14. In this embodiment, earth and sand are transported from the land conveyor 14 to the floating conveyor 20 via the connection conveyor 16, but the present invention is not limited to this method, and is supplied directly from the land portion 10 to the floating conveyor 20. Also good.
[0014]
In addition, when adding an anti-separation agent to the pre-mixed treated soil to be added, it is preferable to add it near the placing chute 32.
[0015]
【The invention's effect】
According to the landfill method according to the present invention, the work efficiency depends only on the conveyor system and is not easily affected by weather conditions or the like. Therefore, a significant improvement in the operation rate can be expected as compared with the case where premixed soil as landfill material is manufactured on an offshore plant ship. Moreover, since the premixed soil is mixed and prepared in the floating conveyor portion, there is an effect that the land plant equipment and the work area can be reduced in size.
[0016]
Furthermore, it is possible to increase the processing capacity by installing a plurality of series of floating conveyors in a limited landfill construction area, and work efficiency can be further promoted compared with the method using a marine plant ship.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram when a sea area is reclaimed by a dry embankment method which is a preferred embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Land part 14 Land conveyor 20 Floating conveyor 22 Carrier 30 Landfill planned sea area 32 Casting chute 34 Mixing means

Claims (1)

A floating conveyor is continuously connected from the land to the planned landfill area, and a mixing means is provided in the transfer section of the conveyor, so that the soil and solidified material are transported from the land and mixed and prepared to prepare premixed soil. A landfill method using pre-mixed treated soil, comprising adding an anti-separation agent to the pre-mixed treated soil in the vicinity of the placed chute when throwing it into a water area from a placing chute for entering in the sea .

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