JP2000273866A - Device for placing fluidity solidifying treatment material on water bottom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for placing a fluidity solidifying treatment material on a water bottom capable of placing the material surely and placing the material on a water bottom satisfactorily without necessitating delicate cylinder tip height control while maintaining a condition in which a cylinder tip is immersed in a solidifying material placed previously, even if there is some unevenness in fluidity of the fluidity solidifying treatment material to be placed. SOLUTION: This device for placing a fluidity solidifying treatment material on a water bottom has a solidifying treatment material flowing down cylinder 1 suspended from above a water surface toward a water bottom face and a solidifying treatment material supply device supplying the fluidity solidifying treatment material obtained by adding a solidifying material to fluidity earth and sand such as dredging soil continuously or intermittently and allows the fluidity solidifying treatment material to flow down onto the water bottom sequentially while a lower end of the flowing down cylinder 1 is embedded into the fluidity solidifying treatment material which is made to flow down previously and builds up on the water bottom. Inflating and shrinking bags 10, 11, 12 which block the inside of the flowing down cylinder 1 by pouring a fluid into the inside of the flowing down cylinder 1 and release the blocking by its discharge are provided in the flowing down cylinder 1, and the fluidity solidifying treatment material in the flowing down cylinder 1 is forcedly moved downward by inflating and shrinking each inflating and shrinking bag.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for placing a fluidized mud-like solidified material such as underwater concrete or dredged mud soil obtained by mixing a cement or resin-based solidifying agent into dredged soil and sand. The present invention relates to an apparatus for placing a fluidized solidified material on a water bottom using a falling cylinder such as a pipe.

[0002]

2. Description of the Related Art In general, a tremy tube is used for constructing a cast-in-place concrete structure on a water floor.
Concrete casting by this conventional tremy tube is performed by successively placing concrete by sequentially raising the tremy tube while maintaining the state where the tip of the tremy tube is immersed in the concrete dropped first. The dropped concrete is prevented from being washed by water, so that a concrete structure of a certain quality can be obtained.

[0003] The tube tip management of the tremee tube is performed by a method of determining the height of the tremee tube by measuring the depth using red, a method of visually observing by a diver, or the like.

[0004]

In the conventional method as described above, if the tremy tube is raised too early during the concrete placing operation, water is mixed into the tube, and if the lifting is delayed, the tip of the tube becomes too full. There is a problem that the concrete does not flow out and the concrete cannot always be poured in an optimum state.

In recent years, for the purpose of treating dredged soil generated by dredging for maintaining a channel in a port and improving the ground of the seabed, a cement-based solidifying agent has been mixed into the dredged sand and returned to the seabed. A method for forming a solidified ground having the above strength is being developed.

When a mud-like solidified material obtained by mixing a concrete-based solidifying agent into such dredged soil is cast on the sea floor, the ratio of the solidifying agent added is smaller than that of ordinary concrete. If washed with water during installation, the quality will be greatly reduced, and mud and solidifying agents may diffuse into the water and contaminate the water area. It is necessary to maintain the state immersed in the material.

[0007] On the other hand, such solidified dredged mud does not have a constant fluidity like concrete, and in some cases, has a lower fluidity than concrete. However, when the lower end of the flow-down cylinder is buried in the embankment previously cast, there is a problem that it is difficult to flow naturally.

The present invention has been made in view of such a conventional problem,
Even if there is some variation in the fluidity of the fluidized solidified material to be poured, reliable placing can be performed while maintaining the state where the cylinder tip is immersed in the solidified material previously placed, In addition, the object of the present invention is to provide an apparatus for placing a fluidized solidified material on the bottom of a water which can be favorably placed without requiring a delicate cylinder tip height control.

[0009]

SUMMARY OF THE INVENTION The features of the present invention for solving the conventional problems as described above and achieving the intended purpose are as follows.
A solidification treatment material flow-down cylinder that hangs down from the water surface toward the water bottom surface, and at the upper end of the flow-down cylinder, a fluidity solidification treatment material obtained by adding a solidification material to fluid sediment such as dredged soil continuously or intermittently. A solidification treatment material supply device for supplying the solidification treatment material, and in a state where the lower end of the flow-down cylinder is buried in the fluidity solidification treatment material that has been flowed down and raised to the bottom of the water, the fluidization solidification treatment material is sequentially placed on the bottom of the bottom. In the apparatus for placing a fluidized solidified material on a water bottom, at least two of which are closed in the flow-down cylinder by injection of a fluid into the flow-down cylinder and released by the discharge of the fluid. Flow rate of the flowable solidifying material in the falling cylinder by inflating the lower bag while the upper bag is inflated while alternately expanding and contracting the two inflatable bags. Decided to adjust A.

In addition, first and second opening / closing bags for expansion are provided in the flow-down cylinder, and an expansion / contraction bag for pressurization is provided between the two expansion / contraction bags. The contracting bag is inflated to close the inside of the tube, the upper first opening / closing bag is contracted, and the inside of the tube is opened to reduce the compression / decompression bag, and the upper first opening / closing bag is closed. Inflating the pipe so as to close the pipe, reducing the lower second opening / closing bag, and expanding the pressurizing / depressurizing bag with the pipe opened, and at least the lower end of the falling cylinder in the axial direction. It is preferable that the height of the opening at the lower end of the flow-down cylinder is increased according to the surface height of the flowable solidification material cast on the water bottom.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIGS. 1 to 3 show a first embodiment of the present invention. In the drawings, reference numeral 1 denotes a solidified material falling tube composed of a tremie pipe, which is suspended from the work boat 2 to the bottom of the water, A material obtained by adding a cement-based solidifying material or a fluidized solidifying material such as concrete to the dredged soil is introduced into the dredged soil to flow down to the bottom of the water through the falling tube 1.

The height of the lower opening of the flow-down cylinder 1 can be adjusted up and down so that the lower end thereof is slightly lower than the surface of the processing material A which has been previously cast on the water bottom and raised. Has become.

[0013] In the falling cylinder 1, the first
An opening / closing bag 10 and a second opening / closing bag 11 are provided, and an opening / closing bag 12 is provided between the opening / closing bags 10, 11. Each of these bags is formed in a bag shape by a flexible material such as rubber or synthetic rubber, and is fixed to a part of the inner surface of the flow-down cylinder 1 and is brought into close contact with the entire inner peripheral surface of the flow-down cylinder 1 by pouring water. By expanding and forcibly draining the fluid, the fluidized solidified material is reduced to a size that allows the material to flow smoothly through the falling cylinder 1.

Each of these bags is forcibly injected and drained through a pipe 5 from a pump 4 mounted on the working boat 2 above the water. When a material having a force of contracting by elasticity from water is used as a material of each bag, forced drainage by a pump is not required.

When using the apparatus constructed as described above, first, as shown in FIG. 3 (a), the first opening / closing inflatable bag 10 is inflated and the inside of the tube is closed. The fluidized solidified material A is continuously or intermittently supplied to the hopper 3 at the upper end of the hopper 3 by the solidified material supply device 6 using a pump. The supplied solidified material A accumulates on the first opening / closing bag 10. In this state, the expansion / contraction bag 12 is expanded, and the second opening / closing expansion / contraction bag 11 is expanded to close the tube.

Next, as shown in FIG. 2B, the first opening / closing inflatable bag 10 is contracted to open the inside of the pipe, and the pressurizing / depressurizing inflatable bag 12 is contracted. Since the inside of the pipe is decompressed by the contraction of the expansion / contraction bag 12 and the lower side of the second opening / closing expansion / contraction bag 11 is closed, the solidified material A staying on the upper side is pulled down to the second side. Inflatable bag 11
Is dropped to the upper side.

Next, as shown in FIG. 3C, the first opening / closing bag 10 is inflated to close the inside of the tube, and the second opening / closing bag 11 is contracted to open the tube. When the inside of the tube is pressurized by expanding the expansion / contraction bag 12 for compression, the solidified material a under the first opening / closing expansion / contraction bag 11 is extruded downward, and is forcibly moved in the discharge direction.

In this manner, the double-opening and contracting bag 10,
11 are alternately expanded and contracted to alternately open and close the upper and lower sides of the inflatable bag, and the inflated and contracted bag 12 is repeatedly expanded and contracted. Extruded.

FIGS. 4 to 6 show a second embodiment of the present invention. In this embodiment, first and second opening / closing bags 21 made of the same material as described above are placed in a falling tube 20. 22
Are installed adjacent to the vertical arrangement. In both bags, water is forcibly injected and drained through an injection and drainage pipe (not shown) as described above.

In use, the two bags 21, 22
The first opening / closing bag 21 is reduced while the second opening / closing bag 22 is inflated to close the pipe as shown in FIG. 5A. As a result, the solidified material flows down from the upper side of the pipe, and in this state, as shown in FIG.
To reduce the size of the second inflatable bag 2 for opening and closing.
The solidified material A descends into the space created by the reduction of 2. Next, as shown in FIG. 5C, the inside of the pipe is closed by inflating the first opening / closing inflatable bag 21, and then the second opening / closing inflatable bag 22 is inflated to be displaced by this inflation. Since the solidified material A is prevented from moving upward, a pushing force is applied downward.

As shown in FIG. 6, the falling tube 20 has a structure capable of extending and contracting in the axial direction.
3 and is suspended from a work boat (not shown) so that the height of the lower end opening can be adjusted by winding up the suspending wire 23 in accordance with the rise of the surface of the solidified material A placed on the water floor. Has become.

It should be noted that the stretchable portion may be provided only on a part of the lower end side of the inflatable bag.

In the above-described embodiment, water is used as a fluid for inflating and contracting each bag. However, other fluids such as air may be used.

Furthermore, in the above-described example, each bag is projected and fixed to the inner surface of the downstream cylinder. However, it is preferable that a recess for accommodating a bag in a reduced state is provided on the inner surface of the downstream cylinder, and the bag is fixed inside. .

[0025]

As described above, the apparatus for placing a fluidized solid material on the bottom of the water according to the present invention is closed by the injection of a fluid such as water into the falling cylinder, and is closed by discharging the fluid. It is provided with at least two inflatable bags that are released from the blockage, and alternately inflates and contracts the two inflatable bags, and inflates the lower bag while the upper bag is inflated, thereby allowing the lower bag to inflate. By adjusting the flow rate of the flowable solidification material, the flowability of the flowable solidification material to be cast is low, and the pipe tip is naturally immersed in the previously solidified material. Even if the flow does not flow down, reliable casting is possible, and even if the tip of the cylinder goes deeply into the solidified material that was previously cast and the flow resistance in the cylinder increases, it can be reliably cast. Good water without the need for delicate tip height control It is pouring.

Further, by using a bag that is shrunk by pouring and draining as a means for forcibly flowing down, corrosion of seawater and abrasion of the mechanism due to contact with the solidified material are eliminated, and a highly durable apparatus can be obtained.

Further, the first and second opening / closing bags are provided vertically in the flow-down cylinder, and a compression / decompression bag is provided between the two expansion / contraction bags. The inflatable bag is inflated to close the tube and the first
The opening / closing inflatable bag is contracted to open the inside of the tube, and the pressurizing / decompressing inflatable bag is contracted. The upper first opening / closing inflatable bag is inflated to close the inside of the tube, and the lower second opening / closing bag is closed. By reducing the size of the inflatable bag and expanding the inflatable bag under the condition that the inside of the pipe is opened, the forced flow is more reliably increased.

Further, at least the lower end side of the flow-down cylinder is made expandable and contractable in the axial direction, and the height of the lower end opening of the flow-down cylinder is raised in accordance with the surface height of the flowable solidified material cast on the water bottom. By doing so, the height of the cylinder tip can be easily controlled, and the forced flow of the solidified material becomes smoother.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of the device according to the present invention.

FIG. 2 is a cross-sectional view of the inflatable bag according to the first embodiment.

FIGS. 3A to 3C are cross-sectional views showing an operation state of the above.

FIG. 4 shows an inflatable bag according to another embodiment of the device according to the invention.

5 (a) to 5 (c) are cross-sectional views showing an operation state of the above.

FIG. 6 is a cross-sectional view showing a telescopic portion of the lower end of the downflow cylinder of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS A Fluid solidification processing material 1 Flowing cylinder 2 Work boat 3 Hopper 4 Pump 5 Pipe 6 Solidification processing material supply device 10 First opening / closing expansion / contraction bag 11 Second opening / closing expansion / contraction bag 12 Pressurization / decompression expansion / contraction bag 20 Flowing cylinder 21 First opening / closing bag for opening / closing 22 Second opening / closing bag for opening / closing 23 Hanging wire

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Toshiyuki Izumi 1534-1, 4-ku, Nishinasuno-cho, Nasu-gun, Tochigi F-term in Goyo Construction Co., Ltd. Technical Research Institute 2D045 AA04 BA01 BA04 CA12 CA18

Claims (3)

[Claims] 1. A solidified material falling tube which hangs down from the water surface to the water bottom surface, and a fluidized solidified material obtained by adding a solidified material to fluidized sand such as dredged soil at the upper end of the falling tube. And a solidification processing material supply device for supplying intermittently or intermittently,
In the fluidized solidified material that has been flowed down and raised to the bottom of the water, the fluidized solidified material is successively allowed to flow down to the bottom with the lower end of the falling cylinder buried in the bottom. The apparatus according to claim 1, further comprising at least two inflatable bags, wherein the inflow tube is closed by injecting a fluid into the inflow tube, and the occlusion is released by discharging the fluid. A fluid solidification process characterized by adjusting the flow rate of the fluid solidification material in the falling cylinder by inflating the lower bag alternately while expanding and contracting the upper bag alternately. Underwater casting equipment for wood. And a first opening / closing bag for opening and closing, which is vertically arranged in the flow-down cylinder, and an inflating bag for pressurizing and decompressing between the two inflatable bags. The inflatable bag is inflated to close the inside of the tube, and the upper first openable / closing bag is reduced to reduce the pressurizing / decompressing bag while the tube is open. The fluidized solidification according to claim 1, wherein the fluidization solidification is performed by inflating the pipe to close the inside of the pipe, reducing the second opening / closing bag on the lower side, and expanding the pressurizing / depressurizing bag with the pipe opened. Underwater casting equipment for processing materials. 3. The flow-down cylinder has at least a lower end side that is freely expandable and contractable in the axial direction, and the height of the lower end opening of the flow-down cylinder is increased in accordance with the surface height of the flowable solidified material cast on the water bottom. The apparatus according to claim 1 or 2, wherein the solidifying material is placed on the bottom of the water.