JP4314598B2 - Water bottom casting device for fluid mud - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fluid mud material in which a fluid mud material made of solidified dredged clay mixed with cement-based solidifying agent is added to the bottom of the water using a falling cylinder such as a tremy pipe. The present invention relates to a water bottom casting apparatus.
[0002]
[Prior art]
In general, tremy pipes are used in the construction of cast-in-place concrete structures at the bottom of the water. This conventional pouring of concrete with tremy pipes is performed one after another by sequentially pouring concrete by raising the tremy pipe while maintaining the state where the tip of the tremy pipe is immersed in the initially dropped concrete. The dropped concrete is prevented from being washed with water so that a concrete structure of a certain quality can be obtained.
[0003]
Further, the tube tip management of the tremy tube is performed by a method of determining the height of the tremy tube by depth measurement using red, a method of visual observation by a diver, or the like.
[0004]
[Problems to be solved by the invention]
In the conventional method as described above, during concrete placement work, if the tremmy pipe is raised too early, water will be mixed in the pipe, and if the raising is delayed, the cylinder tip will be buried too much and the concrete will not flow out, There was a problem that concrete could not be placed in an optimal state at all times.
[0005]
Also, in recent years, for the purpose of processing dredged sand caused by dredging for maintaining the channel in the port and improving the ground of the seabed, cement-based solidifying agent is mixed into the dredged sand and returned to the seabed. A method of forming solidified ground is being developed.
[0006]
When placing a sludge mixed with a cement-based solidifying agent in such dredged soil on the seabed, the addition rate of the solidifying agent is small compared to normal concrete, so When washed, the quality is greatly degraded, and mud and solidifying agents may diffuse into the water and contaminate the water area. Therefore, when placing, always place the tube tip into the treated material that was placed first. It is necessary to maintain the state.
[0007]
On the other hand, such solidified dredged mud is not constant in fluidity like concrete, and in some cases it is less fluid than concrete. In conventional tremy pipes, In the state where the lower end of the falling cylinder was buried in the embankment that was laid, there was a problem that it was difficult to flow down naturally.
[0008]
In view of such conventional problems, the present invention provides a solidifying agent in which the tube tip is cast first even if there is some variation in the fluidity of the fluid mud material made of the solidified clay to be cast. Providing a water-bottoming device for fluid mud that can be placed securely while maintaining a state of being immersed in the inside, and that can be satisfactorily placed without the need for subtle cylinder tip height management. It was made for the purpose.
[0009]
[Means for Solving the Problems]
In order to solve the conventional problems as described above and achieve the intended purpose, the feature of the water- bottom casting device of the fluid mud material according to the present invention is a mud that is suspended from the water surface toward the water surface. It has a material flow cylinder and a mud material supply device that supplies the upper end of the flow cylinder continuously or intermittently, is inserted into the flow cylinder toward its center, and reciprocates up and down. An operating shaft is provided, and the operating shaft is provided with a downward pressurizing tool that has a small resistance during upward operation and a large resistance to the fluid mud material in the sludge downflow cylinder. A fluid mud material made of solidified dredged clay mixed with cement-based solidifying agent is added to the dredged sand, and the lower end of the mud material falling cylinder is first flowed down and raised to the bottom of the water. In a state of being buried in the material, let the fluid mud flow down to the bottom of the water sequentially. As in that it has to.
[0010]
In addition, the downward pressurizing tool has a flow path that opens upward and downward, and is a piston having a check valve in the flow path, and operates in a reduced diameter direction when operating upward, and expands when operated downward. An umbrella-like body is preferable.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. 1 to 2 show a first embodiment of the present invention. In the figure, 1 is a sludge downflow cylinder made of a tremy tube, which is suspended from the work ship 2 to the bottom of the water. A fluid mud material A made of a solidified dredged clay with a cement-based solidifying agent added to the dredged clay is introduced and allowed to flow down to the bottom of the water through the downflow cylinder 1.
[0012]
Further, the lower end opening of the downflow cylinder 1 can be adjusted up and down so that the lower end of the downflow cylinder 1 is kept at a position slightly lower than the surface of the treatment material A that has been raised on the bottom of the water first. .
[0013]
An operating shaft 10 is inserted into the flow-down cylinder 1 from the upper end at the center thereof. The operation shaft 10 is reciprocated in the axial direction by a reciprocating drive means 11 such as a hydraulic cylinder provided outside the upper end of the falling cylinder or a crank driven to rotate by a motor.
[0014]
At the lower end of the operating shaft 10, a downward pressurizing tool 12 having a small resistance during upward operation and a large resistance when flowing downward is fixed to the fluid mud material A in the downflow cylinder 1. The pressurizing tool 12 is composed of a piston that can move up and down with the operating shaft in the downflow cylinder. The piston is provided with a transmission hole 13 that is vertically opened and opened, and a lower end of the transmission hole 13. The opening is provided with a check valve 14 that closes the opening by the upward flow in the permeation hole 13 and opens by the downward flow, whereby the pressurizing tool 12 closes the inside of the falling cylinder 1 during the downward operation. Alternatively, the operation is performed in a state close to this, and on the contrary, when the operation is upward, the upper fluid mud material A is relatively moved downward through the permeation hole 13, that is, the fluid mud material A is moved upward without moving upward. Is configured to do.
[0015]
As a result, the fluid mud material A in the inside is pressed downward by forcibly moving the pressure mud material A back and forth while supplying the fluid mud material A from the upper end into the falling cylinder 1. To be flowed down.
[0016]
FIG. 3 shows another embodiment of the present invention. In this embodiment, the diameter is expanded and contracted by the reciprocating motion of the operation shaft 10, and the resistance to the fluid mud material A in the falling cylinder 1 is A downward pressing tool 20 that is small during upward operation and large during downward operation is fixed. The pressurizing tool 20 is rotatably supported at the lower end portion of the operating shaft 10, and is composed of a resistor 21 that opens in an umbrella shape by a resistance during a downward operation, and operates in a direction that is narrowed by a resistance during an upward operation. As in the above-described embodiment, during the downward operation, the operation is performed in a state where the inside of the downflow cylinder 1 is closed or close to this, and conversely, during the upward operation, the fluid mud A is raised without moving upward. Is configured to do.
[0017]
As a result, the fluid mud material A inside is pressed downwardly and forcedly by reciprocating the pressurizing tool 20 up and down while supplying the fluid mud material A from the upper end into the falling cylinder 1. To be flowed down.
[0018]
【The invention's effect】
As described above, the submerged casting device for fluid mud material according to the present invention includes an operating shaft that is inserted into the flow-down cylinder toward the center thereof and is reciprocated up and down. In addition, the fluid mud material to be placed has low fluidity because the resistance to the fluid mud material in the downflow cylinder is small during upward operation and large downward pressure tool during downward operation. Even if there is no natural flow when immersed in the fluid mud material previously cast, fluid casting is possible, and the fluid tip is cast first by the tube tip. Even if it goes deep inside and the flow resistance in the cylinder increases, it can be placed reliably, and a good water bottom can be placed without the need for delicate pipe tip height management.
[0019]
Further, as a downward pressurizing tool, by using a piston having a flow path that opens upward and downward and having a check valve in the flow path, durability is high and reliable forced feeding can be obtained.
[0020]
In addition, by using an umbrella-like body that operates in the diameter-reducing direction during the upward operation and expands during the downward operation as the downward pressurizing tool, resistance during the upward operation is small and highly efficient forced feed can be obtained.
[Brief description of the drawings]
FIG. 1 is a side view showing an example of an apparatus according to the present invention.
FIG. 2 is a cross-sectional view of the same pressurizing tool portion.
FIG. 3 is a cross-sectional view showing another example of a pressurizing tool portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS A Fluid mud material 1 Mud material lower pipe 2 Work ship 3 Hopper 10 Operation shaft 11 Reciprocating drive means 12 Pressurizing tool 13 Permeation hole 14 Check valve 20 Pressurizing tool 21 Resistor

Claims (3)

Has a muddy material falling cylinder was suspended toward the water bottom from above the water surface, and a continuous or intermittently supplying muddy material supply device to the upper end of the flow under tube, the flow-down cylinder, the center An operating shaft that is inserted in the direction and is reciprocated up and down, and on the operating shaft, the resistance to the fluid mud in the sludge downflow cylinder is small during upward operation and large downward addition during downward operation. The muddy material supply device is provided with a fluid muddy material made of solidified dredged clay mixed with cement-based solidifying agent in dredged sand, and the lower end of the muddy material lowering pipe is Flowing mud material is characterized by the fact that the fluid mud material is made to flow down to the bottom of the fluid mud material that has been buried in the fluid mud material that has flowed down to the bottom of the water. Equipment.   The water bottom casting apparatus for fluid mud according to claim 1, wherein the downward pressurizing tool is a piston having a flow path that is open upward and downward, and provided with a check valve in the flow path.   The water bottom casting apparatus for fluid mud according to claim 1, wherein the downward pressure tool is an umbrella-like body that operates in a diameter-reducing direction during upward operation and expands during downward operation.

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