JPS6353334B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a caisson with a lid, in particular, a caisson with a lid that is filled with sand by pumping and filling the inside of the caisson with sand and water in a slurry state using a water conveyance method using a sand pump or the like. A caisson body with a lid whose interior is partitioned into a plurality of chambers by a plurality of partition walls, and a caisson body with a lid formed at both upper ends of each of the partition walls and at an intermediate portion between the top and bottom of the partition walls. The caisson body consists of a flow hole for the filling material, an inlet for the filling material provided at the center of the upper surface of the caisson body, drainage ports provided at or near the four corners of the upper surface of the caisson body, and a filling material pressure pump. The material is sequentially pressure-fed and filled into the plurality of chambers through the communication holes.

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a caisson 1 with a lid. The lidded caisson 1 of the present invention has an upper lid 2 unlike a normal caisson, and has nine partition chambers 4 partitioned by a middle partition wall 3. Also, each partition wall 3
A plurality of communication holes 5 are opened at both ends and near the center of the upper part of the chamber to allow the sand water, which is conveyed to the slurry for depositing and is supplied from the injection port 6, to flow to the next chamber. Furthermore, the above-mentioned injection port 6 is located in the center of the upper surface of the upper lid 2.
and four drain ports 7 are provided at the four corners of the upper lid 2.

The caisson with a lid, which has been integrally fabricated on land and towed, is placed in a predetermined installation position by pouring water into it and setting it down. As shown in FIG. 2, an earth carrier 8 loaded with a filling material 10 made of ordinary sand is placed on standby near the caisson 1 with a lid set at the planned position, and a sand pump 9 mounted thereon is used to transport the earth into the earth. Immediately after the caisson is installed, the filling material 10 sucked from the caisson is forcedly injected into the caisson in the form of a slurry of sand and water through the injection pipe 11 connected to the caisson and through the injection port 6 in the upper part of the caisson. The inside of the caisson 1 with a lid is in a sealed state, and the mixed liquid pumped by the sand pump 9 presses out the water that had been filled inside for settling, and this discharged water is passed through the drain port 7 to the injection pipe. At the same time as 11 is connected, it is returned to the earth carrier's hold through the connected drain pipe 12 and used again to assist in suctioning the filling material 10.

Examples of changes in the state inside the caisson when the above operation is carried out for a long time are shown in FIGS. 4 to 9.

As shown in FIG. 4, the partition chamber No. has an inlet 6.
Among the sand water injected into the chamber 1, the sand having a high specific gravity is accumulated without being transported to the next chamber and reaches the lowest position a of the circulation hole 5. If the pumping of the injected sand continues, as shown in Fig. 5, the sand will begin to flow from the lowest flow hole a to the next chambers No. 2 and No. 2' partitions, and the flow hole a will become blocked. The outflow will continue until the After the communication hole a is completely blocked, the surface of the accumulated sand in the No. 1 partition rises and reaches the upper communication hole b, as shown in FIG. In Figure 7, from hole b in No. 1 room.
Outflow to chambers No. 2 and No. 2′ takes place, and simultaneous accumulation of sand in each chamber continues. After the hole b in the No. 1 chamber is also blocked, the No. 1 chamber is almost filled with sand, as shown in Figure 8, and the flow from the uppermost communication hole c to the No. 2 and No. 2' chambers. Only a small channel for outflow is left, and in the end, the sand filling is completed to almost 100% as shown in Figure 9.

The above is an explanation of the situation in three chambers seen from one side of the caisson, but the situation does not change even in six chambers or any other number of chambers, and sand accumulates sequentially from the inlet to the drain. is filled throughout the caisson.

According to the present invention, the inside is sealed by the lid,
Moreover, even in a caisson separated by a partition wall,
The circulation holes are located at both upper ends of the partition wall, so when a mixture of sand and water is injected with a pump, the water in the room is smoothly drained as it fills up, and the injected sand flows through the upper ends of the partition wall. By flowing into each corner of each empty chamber through the circulation holes provided in the sand, the sand is sufficiently filled to the top of the chamber, and as a result, the filling rate of sand in each empty chamber is close to 100%. effective.

In addition, in the present invention, the sand is pumped by a pump to fill the inner chamber, and the chamber at the end is not suctioned, so that the sand in the upper part of the chamber at the end is not forcibly removed by suction together with the water, and the chamber at the end is completely filled. There is also a big profit that comes with filling.

Furthermore, in the present invention, the inlet is provided at the center of the top surface of the caisson body, and the drain port is provided at or near the four corners of the top surface of the caisson body. The sand is filled in the direction of the four corners so that the filled sand does not create an unbalanced load on the foundation mound of the caisson, and it has the effect of being able to sufficiently fill every corner of the caisson with sand.

[Brief explanation of drawings]

Fig. 1 is an explanatory perspective view of a caisson with a lid according to the present invention, Fig. 2 is a longitudinal sectional view thereof, Fig. 3 is an explanatory plan view thereof, and Figs. 4 to 9 are explanations of the progress of filling the caisson. It is a diagram. 1... Caisson with lid, 2... Top lid, 3... Middle partition wall, 4... Partition chamber, 5... Distribution hole, 6... Inlet, 7...
Drainage port, 8...Earth carrier, 9...Sand pump, 10...
Filling material, 11... Injection pipe, 12... Drain pipe, a, b,
c... Distribution hole.

Claims (1)

[Claims] 1. A caisson body with a lid whose interior is partitioned into a plurality of chambers by a plurality of partition walls, and a communication hole for filling material formed at both upper ends of each of the partition walls and at an intermediate portion between the top and bottom of the partition walls. , an inlet for filling material provided at the center of the upper surface of the caisson body, drainage ports provided at or near the four corners of the upper surface of the caisson body, and a pump for pumping the filling material; A caisson with a lid, characterized in that the chamber is sequentially pressure-fed and filled through the circulation hole.