JP4317954B2 - 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, if the tremmy pipe is raised too early in the concrete placing work, water will be mixed in the pipe, and if the raising is delayed, the tube tip will be filled too much and the concrete will not flow out, which is always optimal. There was a problem that concrete could not be placed in this state.
[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 a conventional problem, the present invention provides a mud-like shape in which the tube tip is cast first even if there is some variation in the fluidity of the fluid mud material composed of the solidified dredged clay to be cast. A fluid muddy material water bottom casting device that can be placed reliably while maintaining the state of being immersed in the material, and can perform good water bottom placement without requiring subtle cylinder tip height management. It was made for the purpose of provision.
[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. A material dropping cylinder, and a mud material supply device that continuously or intermittently supplies a fluid mud material to the upper end of the falling cylinder, and at least a part of the falling cylinder is configured in the falling cylinder An elastic cylinder part composed of a cylindrical body mainly composed of a flexible material such as rubber or synthetic rubber, and a crushing mechanism that crushes the elastic cylinder part in the radial direction from the outer peripheral side and sequentially moves the crushing position downward. A fluidized mud material made of solidified treated mud soil in which a cement-based solidifying agent is mixed with dredged sand, and the lower end of the mud material falling cylinder. The fluid mud that was flown down to the bottom of the water In a state of being embedded in, in that so as to flow down a flowable slurry material sequentially sea bed.
[0010]
It is to be noted that a plurality of crushing tools that reciprocate in the radial direction of the elastic cylinder portion are provided side by side in the axial direction of the elastic cylinder, a crushing mechanism that is operated in the crushing direction in order from the upper crushing tool, and elastic A crushing tool is fixed at regular intervals to a swivel drive body such as an endless belt or chain that is outside the tube portion and is stretched in the axial direction of the elastic tube portion, and is crushed by the swivel operation of the swivel drive body. It is preferable to provide a crushing mechanism that moves the tool from above to below.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. 1 to 3 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, and from the hopper 3 at the upper end, 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]
A tube pump mechanism 10 is provided in the middle of the falling cylinder 1. As shown in FIG. 2, this mechanism includes an elastic cylinder part 11 mainly composed of a flexible material such as rubber or synthetic rubber constituting a part of the falling cylinder 1 and a pair of left and right parts that sandwich and crush the elastic cylinder part 11 with each other. Is composed of a plurality of crushing mechanisms 12, 12... Each having crushing tools 12a, 12b. The crushing mechanisms 12, 12... Are arranged at regular intervals in the vertical arrangement, and each crushing tool 12 a, 12 b is a reciprocating drive mechanism 14 a made up of a hydraulic cylinder fixed to the support frame 13, 13. 14b is reciprocated.
[0014]
The tube pump mechanism 10 configured as described above crushes the elastic cylinder portion 11 by operating each pair of crushing tools 12a and 12b simultaneously in directions approaching each other, and releases crushing by operating them in directions away from each other. By releasing the crushing, the elastic cylinder portion 11 returns to the original cylindrical shape by the restoring force of water itself.
[0015]
This tube pump mechanism 10 is forcibly pushing down the mud material A flowing down from above into the flexible cylinder 11 by sequentially crushing from the crushing mechanism 12 on the upper side and performing crushing release sequentially. As shown in FIGS. 3A to 3E, when the upper crushing mechanisms 12 adjacent to each other are in the crushing state, the crushing operation of the lower crushing mechanism 12 is started, thereby preventing the backward flow upward. In this state, the flexible cylinder 11 is crushed, thereby forcibly feeding it downward.
[0016]
The tube pump mechanism may have another structure, and FIG. 4 shows another embodiment of the tube pump mechanism. In this mechanism 20, a pair of endless chains 21 and 21 are provided on both sides of the elastic cylinder portion 11. By installing the crushing tools 22a and 22b that make a pair with each endless chain 21 at regular intervals, and driving the endless chains 21 and 21 so that the elastic cylinder portion 11 side faces downward, respectively. 4 (a) to 4 (b), the positions crushed by the pair of crushing tools 22a and 22b move downward, and the internal mud material A is forcibly fed downward sequentially.
[0017]
In addition, the crushing tools 22a and 22b may be rollers that are in rolling contact with the cylinder surface in addition to the piece-like ones that are in sliding contact with the cylinder surface.
[0018]
【The invention's effect】
As described above, the water-bottom casting apparatus for a fluid mud material according to the present invention is a cylindrical body mainly composed of a flexible material such as rubber or synthetic rubber constituting at least a part of the falling cylinder. A tube pump mechanism comprising: an elastic cylinder portion comprising: an elastic cylinder portion; and a crushing mechanism that crushes the elastic cylinder portion in a radial direction from the outer peripheral side and sequentially moves the crushing position downward. The fluidity of the fluid mud material is low, and even when natural flow does not occur in the state where the tube tip is immersed in the fluid mud material that has been placed first, reliable placement is possible. In addition, the tube tip enters deeply into the muddy material that was previously placed, and even if the flow resistance in the tube increases, it can be placed reliably, and there is no need to manage the height of the tube well. Can do.
[0019]
In addition, by using a crushing mechanism in which a plurality of crushing tools that reciprocate in the radial direction of the elastic cylinder portion are arranged in the axial direction of the elastic cylinder and operated in the crushing direction in order from the upper crushing tool, The wear part due to the seawater can be reduced, and the wear of the mechanical part due to the corrosion by the seawater or the contact with the muddy material is reduced, and a highly durable device can be obtained.
[0020]
Further, a crushing tool is fixed to a turning drive body such as an endless belt or chain which is outside the elastic cylinder portion and is stretched in the axial direction of the elastic cylinder portion, and the swivel drive body swivels. By using a moving crushing mechanism in which the crushing tool is moved from the upper side to the lower side by an operation, forced feeding can be obtained only by continuously turning a simple mechanism.
[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 showing the tube pump mechanism of the above.
FIGS. 3A to 3E are explanatory views showing operation states of the above.
FIG. 4 shows another example of the tube pump mechanism used in the present invention, and (a) to (e) are cross-sectional views showing the operating states of the above.
[Explanation of symbols]
A Fluid mud material 1 Mud material falling cylinder 2 Work ship 3 Hopper 10 Tube pump 11 Elastic cylinder part 12 Crushing mechanism 12a, 12b Crushing tool 13 Support frame 14 Reciprocating drive mechanism 20 Tube pump mechanism 21 Endless chain 22a, 22b Crushing Ingredients

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 fluidity muddy material to the upper end of the flow under column, the flow-down An elastic cylinder part made of a cylindrical body mainly composed of a flexible material such as rubber or synthetic rubber constituting at least a part of the falling cylinder, and the elastic cylinder part is crushed in the radial direction from the outer peripheral side of the cylinder, A fluidized mud composed of a solidified treated mud that has a tube pump mechanism composed of a crushing mechanism that sequentially moves the crushing position downward, and in which the cement-based solidifying agent is mixed with the mud material by the mud material supply device. The material is supplied, and the lower end of the muddy material flow pipe is made to flow down to the bottom of the water in the state where the lower end of the muddy material is buried in the muddy material that has been flown down and raised to the bottom of the water. bottom of the water fluidity muddy material that has been made as characterized in Setting apparatus.   2. A crushing mechanism that includes a plurality of crushing tools that reciprocate in the radial direction of the elastic cylinder portion, arranged in the axial direction of the elastic cylinder, and that is operated in the crushing direction in order from the upper crushing tool. Water-flooding device for fluid mud.   A crushing tool is fixed at regular intervals to a turning drive body such as an endless belt or chain that is outside the elastic cylinder portion and is stretched in the axial direction of the elastic cylinder portion. The water-bottom casting device for fluid mud according to claim 1, further comprising a crushing mechanism that moves the crushing tool downward from above.

Images