JPS6233928A - Tremie tube for placement of concrete under water - Google Patents

Abstract

PURPOSE:To greatly widen the placing range of concrete by making control on the penetration amount of a tremie tube easier by a method in which a discharge port is provided in the side of a tremie tube and the tip portion or whole portion of the tremie tube is made rotatable. CONSTITUTION:When concrete is charged from the back end of a tremie tube, the charging direction of the concrete is changed due to its collision with the lower slope of each discharge portion 24 and the concrete is discharged from a discharge port 26 formed in the side.A motor 20 is ten operated, and the rotation force is transmitted through a motive gear 22 and a follow gear 18 to the tip portion 12 to turn the discharge portion 24. Centrifugal force is applied to concrete C to promote the discharge of it to the horizontal direction, and the concrete is leveled off by the rotation of the discharge portion 24. The number of the displacing times of the tremie tube and the number of the setting points of the tube can thus be greatly reduced, thus simplifying the placing operation of the concrete.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a tremie pipe for underwater concrete placement,
In particular, it relates to a product with an improved pouring range.

(Prior Art) The tremie method is well known as a method for placing underwater concrete.

FIG. 4 is an explanatory diagram of the general tremie construction method.

This construction method uses a tremie pipe 1 in which hollow cylinders with a funnel-shaped popper attached to the upper end are connected as appropriate.Concrete C poured into the hopper falls through the tremie pipe 1, and ) 1 is discharged from outlet 1a.

In a normal tremie tube 1, the discharge port 1a is located in the direction of the 1111 line, and the ejected inks 1 to C are deposited in a mountain shape around the tremie tube 1.

Then, while maintaining the state in which the tip discharge port 1a slightly penetrates into the deposited concrete 1-C, the tremie tube 1 is gradually inserted.
While pulling up concrete I-C is supplied. fil
If the outlet 1a is placed at a distance from the concrete 1-C, the monthly rate of composition of the concrete C will be separated, so the amount of penetration will be strictly controlled, and when the height of the peak reaches a predetermined amount, the tremie pipe 1 Move it to another location and repeat the same process.

(Problems to be solved by the invention) The tremie tube 1 having the above configuration has the following problems.
Noko.

However, in the conventional tremie tube 1, the concrete υ
1-C is piled up in a mountain shape with an angle of repose O determined by its fluidity or viscosity, and does not spread over a very wide range. In particular, underwater concrete needs to keep the separation of its constituent phases to a low level, and because it is formulated to have high viscosity, it has less horizontal spread than a conventionally formulated concrete.

For this reason, the Remy pipe 1 must be transferred frequently, which takes time for the pouring work, and there is a possibility that the discharge port 1a may become separated from the concrete 1-C! 1 becomes larger.

Expansion of the pouring range can be improved to some extent by making the size of the discharge port 1a smaller, since the tendency of the fallen concrete 1 to C to flow laterally increases, but with this method, it is difficult to control the amount of penetration. It becomes even more difficult.

This invention was made in view of these problems, and its objectives are: 1- to make it possible to significantly expand the casting range without making it difficult to manage the amount of Remy pipe penetration; An object of the present invention is to provide a 1-Remy pipe for underwater concrete placement.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a Remy tube that supplies concrete from the rear end of a hollow solid installed in water and discharges it from the tip. The present invention is characterized in that the distal end discharge port of the tremie tube is left open to the side, and the distal end of the tremie tube or the entirety thereof is rotatable.

(Function) In the tremie tube with the configuration shown above, the supplied]
~ is discharged laterally from the outlet, and 1 i~ is discharged while rotating part or the whole of the Remy tube, 1
The flow direction of the concrete released from the Remy pipe is almost horizontal, which greatly improves the casting range.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a tremie pipe for underwater concrete placement according to the present invention.

The tremie tube shown in the figure has a hollow cylindrical body as its basic structure, is installed in the water in an almost vertical state, and is the same as the conventional one in that it discharges concrete C supplied from the rear end from the tip.

The tremie tube shown in the figure has the following features.

That is, the distal end portion 12 is liquid-tightly connected to the main body portion 10 of one Heremy tube via the backing 14, a bearing 16 is interposed in the connecting portion, and a driven gear 18 is fitted around the outer circumference of the distal end portion 12. A driving gear 22 that is rotationally driven by an electric motor 20 attached to the outside of the main body 10 is meshed with the driven gear 18.
2 is rotatable.

Moreover, the discharge part 24 of the concrete C provided at the tip part 12 is inclined obliquely downward with respect to the tremie tube axis and protrudes outward, and has four steps (
Each outlet 26 is substantially parallel to the axis of the Heremy tube and opens laterally.

In the tremie pipe configured in this way, when the concrete C poured from the rear end falls, it hits the lower slope of each discharge part 24 and the flow direction is changed, and the flow direction is changed from the side-opening discharge port 26 in an almost horizontal direction. is released.

At the same time, the electric motor 20 is driven, and rotational force is transmitted to the distal end portion 12 via the driving gear 22 and the driven gear 18, thereby rotating the discharge portion 24.

Concrete C discharged by rotation of each discharge section 24
The centrifugal force is applied to promote discharge in the horizontal direction, and the discharge part 24 rotates to flatten the discharge part.

As a result, concrete C discharged from each discharge port 26
The discharge is almost horizontal, and the tip 1
Since the rotational force of 2 is also applied, it spreads over a wide area while being flattened.

Note that the rotational speed and direction of the tip portion 12 are as follows:
The amount of pouring C, the pouring area, and the viscosity of concrete 1 to C <r are controlled as appropriate.

Figures 2 and 3 show second and third embodiments of Remy pipes 1 to 1 for underwater concrete placement according to the present invention, and only the features thereof will be explained below. .

J i.e. in these examples 1) of concrete C
The one outlet 26 in Fig. 2 has two locations facing each other in the circumferential direction, and the one in Fig. 3 has one outlet 26. The rotation of the tip portion 12 as in the example is the same in that it has the same structure.

This J: una configuration also provides 41 effects and 19 effects as in the above embodiment.

In addition, although the case where only the distal end portion 12 is rotated has been illustrated in the case of "-recording moderation," if the driving depth is not very deep, the entire pipes 1 to 1 may be rotated and covered.

(Effects of the Invention) As described above in detail in the examples, according to the tremie pipe for underwater concrete placement according to the present invention, concrete can be spread over a wide area with one installation. This greatly reduces the number of times tremie pipes are transferred or the number of installation points, allowing for hassle-free pouring work.

In addition, the poured concrete is leveled,
In addition to the above-mentioned reduction in transfer, there is a reduced possibility that the retremy tube will separate from the poured concrete, making it possible to obtain a high-quality concrete structure while suppressing material separation.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of one Heremy tube of the present invention, in which (A) is a longitudinal sectional view, and (B) is an I of the same figure (A).
-I arrow direction view, FIG. 2, and FIG. 3 are respective side views showing other embodiments of the present invention. FIG. 4 is an explanatory diagram of a conventional tremie tube. 10... Main body 12... Tip 1/1... Backing 16...
Bearing 18... Driven gear 20...
...Electric motor 22...Driving gear 24...
...Discharge section 26...Discharge port Patent applicant Obayashi Co., Ltd. Attorney - Kensuke Shiro Figure 1

Claims (2)

[Claims] (1) In a tremie tube that supplies concrete from the rear end of a hollow cylinder installed in water and discharges it from the tip, the tip discharge port of the tremie tube is opened to the side, and the tip of the tremie tube is Alternatively, a tremie pipe for underwater concrete placement, characterized in that the entire pipe is rotatable. (2) The tremie pipe for placing underwater concrete according to claim 1, wherein a plurality of the tip discharge ports are provided at opposing positions of the hollow cylinder.