JPS5934332A - Caisson work - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to the construction of concrete structures in one pond, such as bridge foundations and ocean tamagushi. Concerning the drilling method.

This type of construction method is the open caisson construction method.

I don't know about the New Majik caisson construction method, 1M Otoya Ai Takashi construction method, etc. These construction methods σ,) A: Pneumatic caisson construction method and open caisson construction method are often applied in cases of upper 1jls structure or large-scale loads.

Especially in deep rivers, rivers, and areas where waves occur.
If the cost of cofferdam construction is extremely high, such as with a li, the caisson can be towed and suspended for construction. Among these, the open caisson method can be applied when the ground conditions are good, and it is lower cost than the pneumatic caisson method.
It is unsuitable for cases where a single paddle is required to sink the soil, such as when adding soil and stones, and the conditions are difficult for constructing concrete structures underwater. In this regard, in the pneumatic caisson construction method, -
It has the advantage of being able to work under atmospheric pressure or dry conditions, ensuring reliable construction, and having a vertical or precise process. However, since it is an underwater construction, temporary equipment such as building an island or cutting it into small pieces is required.

The present invention is based on the above-mentioned circumstances, and is a 2r1 improvement, in which a cylindrical steel plate cell is cast into the underwater ground, and after the hemostasis is installed in an airy state, the internal pressure is set to be higher than the water depth ratio and the water is dry. By constructing underwater foundations while maintaining the same condition, we aim to eliminate the need for large-scale temporary equipment and shorten the work process by providing a construction method with benefits such as: .

The following are drawings of examples in which the construction method of the present invention is used in conjunction with foundation pile driving. i: Explain in detail with reference.

First, concrete + J should be added to the underwater ground.
Driving foundation piles such as 'c' (see Figure 1).

Next, the cylindrical steel plate cell 2 is pulled, suspended, placed at the construction site, and installed on the frame 8 provided at the upper end of the steel plate cell 2.
The above-mentioned steel plate cell 2 is IJ-set and embedded using the vibro-hammer 4 (see Fig. 2).In order to maintain this Q- and R-setting situation, the above-mentioned vibro-hammers are interlocked so that they are interlocked with each other. Next, excavate the required Lit in the steel plate cell z, and place the deep well 5t-i haze T: leveled concrete) A in water. 3
(see figure). In advance, on land, the reinforcing bars with h'q or n7' footings or steel frame Bi cranes are installed on the above concrete A (see Figure A).Then, the above 'd
d4 Attach the blank 61F15 and locking forceps to the temporary cell 2 (see Figure 5). In this state, the inside of stroke number cell 2 is blocked from the atmosphere 2! 1, so open the drain in deep well 5 and use a compressor to increase the internal pressure of cell 2 to correspond to the water depth pressure while draining the water in cell 2 (see Figure 6).
. Due to the heat, there is a dry G inside cell 2. Construct footing concrete O on υζ (see Fig. 7), standing concrete) Dfi: Construct (1 button in Fig. 3).Next, pour water into cell 2, bring the internal pressure to normal pressure, and stop tape well drainage. (See Figure 9).Finally, the steel plate cell 2 is cut from the upper part of the footing, and the steel plate cell 2, fish 6, etc. are lifted and removed by a crane boat.Deep well 5 is also removed in the same way. Next, construct the upper part of the rising concrete (see Figure 10).In this case,
In order to cut off a portion of the steel plate cell 2, it is preferable that the steel plate cell 2 be configured in advance so that it can be easily separated.

In addition, in the above example of the actual pond, the deep well 5 was placed in the soil layer inside the cell 2 to prevent buoyancy from occurring, or the foundation 1 and the lower part of the steel plate cell 2 were connected. There is a way. Also, cell 2' with earth anchor? i-There is also a way to suppress it. Further, in this embodiment, the reinforcing bars or steel frame B of the footing may be constructed in advance on land, and then lowered into the cell 2 by a crane ship, and the structure may of course be constructed at the site.

As described in detail above, the present invention is to maintain a dry state by placing a cylindrical steel plate cell in underwater ground, attaching the top cover in an open position, and keeping the internal pressure above the water depth. However, it is characterized by the construction of underwater foundations. As a result, you will get the following effects: 2'L heart.

111 footing can be constructed using concrete or dry construction, resulting in a long-lasting structure.

(2) Dyed poems such as the pneumatic caisson method,
There is no need for large-scale temporary equipment such as temporary cutting.

(3) No matter how deep the supporting layer is, if it is up to the level of foundation pile construction, it is construction or uf tklt.

(4) By cutting out a part of the southern European cell, it becomes integrated with the footing, increasing the lateral resistance to the ground, which is advantageous in terms of layer resistance.

[Brief explanation of drawings]

Figures 1 to 3 show the first construction method of the present invention (/J
- side schematic diagrams illustrating the practical example in sequence; 2...Steel plate cell, 4...Vibrohammer, 5...Deep well, IS...None,
.

Claims (1)

[Claims] After pouring a planar rice cell into the underwater ground and making the upstream part airtight, construct the underwater foundation while maintaining a dry state with internal pressure greater than the water depth ratio.