JPH0320344Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an underwater concrete placement device.

[Conventional technology]

Conventionally, as a device for pouring concrete on the seabed, etc., a device is known in which a number of tremor pipes are connected together to reach the seabed, and in some cases, an on-off valve is installed to open and close the lowermost tremor pipe. .

[Problem that the invention attempts to solve]

By the way, when placing underwater concrete on a wide surface with a high head using the above-mentioned pouring equipment, if the amount of concrete covering the lower end of the tremie pipe on the seabed (so-called cover amount) is small at the beginning of pouring, There is a problem that concrete erupts from the lower end of the tremor pipe and is dispersed, causing seawater to enter and cause the concrete to deteriorate.

[Purpose of invention]

This idea was made in view of the above circumstances,
To provide an underwater concrete placing device capable of pouring concrete from the lower end of a tremi pipe to the bottom of the water without spewing it out.

[Means for solving problems]

This idea is to attach a storage cylinder that covers the tremi tube and forms a storage section around the tremi tube to the lower part of the tremi tube through which ready-mixed concrete is cast at the bottom of the water, and to connect the storage cylinder so that the lower end thereof is the lower end of the tremi tube. a storage cylinder that terminates above the storage cylinder; and a slide cylinder that is open at the bottom and fitted to the storage cylinder so as to be slidable in the longitudinal direction with respect to the storage cylinder below the storage cylinder, and the storage cylinder A lifting means is provided between the slide tube and the slide tube, and the slide tube is located at a position such that the lower end of the tremie tube can freely protrude and retract from the lower end of the slide tube when the slide tube is slid. It was established in

[Effect]

After the slide tube is grounded to the ground at the bottom of the water, fresh concrete flows into the storage space from the tremi tube, and then the slide tube is removed from the ground to cover the lower end of the tremi tube with ready-mixed concrete of the required thickness and concrete is poured. to prevent concrete deterioration. Further, after the required cover thickness is secured, by moving the slide tube upward, it becomes possible to pour the concrete with only the tremor tube buried in the poured concrete.

〔Example〕

1 to 7 show an embodiment of this invention. 11 in Figure 1 is a toremi tube,
A driving mechanism D is attached to the tip of the tremor tube 11.

The driving mechanism D includes a lower trembling pipe 11c attached to the joint 12, a storage cylinder 16 having a double cylinder configuration provided in the lower trembling pipe 11c surrounding the lower trembling pipe 11c, and a storage cylinder 16 attached to the storage cylinder 16. The main body is a lifting means 17.

The storage cylinder 16 has a lower end above the lower end of the lower tremor pipe 11c, and the lower tremor pipe 11c
It consists of a storage cylinder 16a that surrounds the housing cylinder 16a, and a slide cylinder 16b that has an open bottom and is fitted into the lower part of the storage cylinder 16a so as to be slidable in the length direction of the storage cylinder 16a. A storage section S is formed between the lower trembling tube 11c and the lower trembling tube 11c.

The elevating means 17 consists of a slide cylinder 17a attached to a storage tube 16a, the tip of a cylinder rod 17b of the slide cylinder 17a is attached to the slide tube 16b, and the slide cylinder 17a moves the slide tube 16b by the cylinder rod 17b. and slide tube 16
b covers or exposes the lower end of the lower tremor tube 11c. That is, the slide tube 16b is provided so that when the slide tube 16b is slid, the lower end of the lower tremor tube 11c can freely move in and out of the lower end of the slide tube 16b.

In addition, in the figure, 20, 20, has its upper end connected to the storage cylinder 16.
A guide rod 22 is a hydraulic hose that is attached to the housing cylinder 16a and guides the sliding movement of the slide cylinder 16b relative to the storage cylinder 16a by inserting the lower end into guide pieces 21, 21, and 21 each having a guide hole fixed to the slide cylinder 16b. . A thermocouple 16c is provided inside the storage cylinder 16a as is well known.

Next, the operation of this device configured as described above will be explained.

To place concrete, use the Tremi pipe 11...
are added one after another until the slide tube 16b reaches the bottom of the water. In this state, a hopper is attached to the tremor pipe 11 that comes out onto the water.

The lower end of the slide tube 16b and the lower tremor tube 11c
When the lower end of the pipe is brought into contact with the bottom of the water as shown in Fig. 3, a well-known plunger (stuffing material) is fitted into the upper end of the tremor pipe 11 from the hopper in a well-known manner, and ready-mixed concrete is introduced from the hopper. As shown in FIG. 3, each tremor tube is filled with fresh concrete and the plunger is moved to the lower end of the lower tremor tube. Next, as shown in FIG. 4, the slide tube 16b is pushed down by the slide cylinder 17a, and the storage tube 16a and the lower trembling tube 11c are slightly raised. By this operation, the plunger at the lower end of the lower tremor pipe 11c is released by the pressure of the fresh concrete, and the fresh concrete flows into the storage section S. When the thermocouple detects that the storage section S is filled with fresh concrete, the slide tube 16b is raised as shown in FIG. The operations shown in FIGS. 4 and 5 are repeated, the ready-mixed concrete is spread on the bottom of the water, and pouring is continued in sequence as shown in FIGS. 6 and 7. When pouring is carried out in this way, the ready-mixed concrete does not directly come out to the bottom of the water at the pouring site and spread out, but instead stays in the storage section S, and the lower end of the lower tray pipe 11c is covered with ready-mixed concrete of a predetermined thickness. Since concrete can be poured in a concrete state, concrete can be poured without scattering of ready-mixed concrete, and concrete deterioration can be prevented.

Moreover, after the required cover thickness is secured in this way, if the slide tube 16b is moved upward as shown in FIG. 7, only the tremor tube 11 (lower tremor tube 11c) can be cast. Possible to perform pouring work while buried in concrete. Therefore, when pouring concrete over a wide area while moving the tremor pipe 11 laterally, the tremor pipe 11 with a small diameter (lower tremor pipe 1
Since only part 1c) moves within the poured concrete, the resistance received from the poured concrete is small and smooth movement is possible, making it possible to perform the work efficiently. Furthermore, after the required cover thickness has been achieved, if the slide tube 16b is moved upward and concrete is poured using only the tremor tube, the poured concrete will be retained in the storage section S. There is no. Therefore, the force that pushes up the storage cylinder 16 due to the concrete retained in this storage section S,
In other words, the buoyancy can be cut off, and the tremor pipe 11 (lower tremor pipe 11
c) It is possible to reliably prevent the lower end portion from slipping out upward from the poured concrete.

[Effect of idea]

As explained above, according to this invention, the slide tube is first brought into close contact with the bottom of the water, the ready-mixed concrete is dropped and retained inside the storage tube and the slide tube, and then the slide tube is raised to place concrete. By doing this, it is possible to perform pouring while ensuring the amount of cover of the ready-mixed concrete covering the lower end of the trembling pipe, and without spewing out the ready-mixed concrete from the lower trembling pipe, and by preventing water from flowing into the trembling pipe, allowing the ready-mixed concrete to flow to the bottom of the water. Concrete can be placed while the concrete is being placed, and therefore the concrete does not deteriorate.

Furthermore, after the required cover thickness is secured, by moving the slide tube upward, it becomes possible to perform pouring work with only the tremor tube buried in the poured concrete. ,
This reduces the resistance when moving the tremor tube laterally, allowing for smooth and efficient work. Moreover, it is possible to move the slide tube upward in this way and perform pouring work with only the tremor tube buried in the poured concrete.
Concrete pouring work after the required cover thickness has been achieved can be carried out without allowing the poured concrete to remain in the storage area.This reliably prevents buoyancy from occurring in the tremie pipe, allowing for reliable work. It is possible to achieve excellent effects such as:

[Brief explanation of the drawing]

Figures 1 to 7 show the first embodiment of this invention. Figure 1 is a sectional view of the storage cylinder, Figure 2 is a plan view of the storage cylinder, and Figure 3 is the storage of the cylinder at the time of starting pouring of ready-mixed concrete. A cross-sectional view of the cylinder; Figure 4 is a cross-sectional view of the storage cylinder when fresh concrete is retained; Figure 5 is a cross-section of the storage cylinder at the start of concrete pouring; Figure 6 is a cross-section of the storage cylinder during concrete pouring. 7 are cross-sectional views showing the state before the storage cylinder is moved. 11...Toremi tube, 11c...Lower toremi tube,
17... Lifting means, 16a... Storage cylinder, 16b...
...Slide tube, S...Storage section.

Claims (1)

[Scope of utility model registration request] A storage cylinder 16 that covers the tremi tube and forms a storage section S around the tremi tube is attached to the lower part of the tremi tube 11 through which ready-mixed concrete is cast at the bottom of the water. Storage tube 16a that terminates above the lower end of the tube 11
and a slide tube 16b that is open at the bottom and fitted below the storage tube so as to be slidable in the longitudinal direction, and between the storage tube 16a and the slide tube 16b. is provided with an elevating means 17, and the slide tube 16b is arranged so that when the slide tube is slid, the tremor tube 1
1. An underwater concrete placing device characterized in that the lower end of the slide cylinder is provided at a position where it can freely move in and out of the lower end of the slide tube.