JP2883914B2 - Caisson stream filling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of filling a caisson with a plurality of filling chambers having uneven heights by filling the filling sand into each filling chamber by a water flow.

[0002]

2. Description of the Related Art Conventionally, in a method of filling a closed caisson in a water stream, as shown in FIG. 3, an injection hole and a drain hole are provided in a top plate of a caisson 1 and a slurry bond 5 is supplied through an injection line 3 and a pump 4. From the caisson 1, the filling sand is settled in the caisson 1, and the remaining water in the caisson 1 is drained to the drain bond 7 through the drain line 6, thereby forming the caisson. 1 is filled with filling sand.

Further, a plurality of filling chambers 2, 2,...
A flow hole is provided in the partition wall of the above, and the filling hole and the drain hole are arranged in the separate filling chambers 2 and 2 so that the filling sand flows from the filling side filling room 2 to the draining side filling room 2. Are filled with the filling sand through a relatively small number of filling holes and draining holes.

[0004]

In the above-mentioned water filling method, the plurality of filling chambers 2, 2,... In the caisson 1 are substantially uniform in height, and each of the filling chambers 2, 2,. Filling sand is filled to a uniform height, but for caisson with multiple filling chambers with uneven height, if this method is applied as it is, the filling sand flows smoothly. Otherwise, problems such as a decrease in the filling rate occur. In addition, the above-mentioned method of filling in a stream of water requires a relatively large-scale facility, so that it is uneconomical to fill a small number of caissons.

SUMMARY OF THE INVENTION In view of the above problems, the present invention relates to a caisson water-filling method for filling a filling sand with a water flow in a caisson having a plurality of filling chambers having uneven heights. It is intended to be provided.

[0006]

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.
In the caisson water filling method, in which the filling sand is filled with a water flow, the caisson is separated from the lower filling room closed by a middle upper plate and the lower filling room by a partition having a sand circulation hole. Provided with a high filling room, the filling sand is charged or injected into the high filling room, spill water is drawn from the upper part of the low filling room to form a water flow, and the inside of the high filling room is formed. Water is injected into the upper or side portion of the sand circulation hole to agitate the filling sand around the sand circulation hole, and the filling sand in the higher filling room is passed through the sand circulation hole. It is to flow into the lower filling room.

[0007]

FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 will be described.

In the figures, reference numerals 11 and 13 denote an outer cylinder wall and an inner cylinder wall having a substantially semicircular planar shape, and 15 an end wall having a substantially linear planar shape, whereby the caisson projects forward. In a double semi-cylindrical shape (a shape that is asymmetrical with respect to the front and rear and whose center of gravity and buoyancy are not on a vertical line).

A high filling chamber 22 is formed in the center of the caisson (inside the inner cylindrical wall 13).
Are formed at the lower part on the outer peripheral side (the lower part on the inner side of the outer cylinder wall 11), and a plurality of lower filling chambers 23 are formed.
Are separated by a partition wall 14, and the lower filling chambers 23, 23,... Are partitioned by partition walls 17, 17,. A relatively small number of sand circulation holes 14a, 14a are provided in the upper part of each of the lower filling chambers 23, 23,... In the partition 14, and by limiting the number and arrangement of the sand circulation holes 14a, an asymmetrical shape is obtained. With regard to the caisson described above, the balance at the time of water injection installation or the like can be appropriately maintained.

The high-order filling room 22 has a side surface closed by an inner cylindrical wall 13 and an end wall 15 and an upper surface open.
After filling, lid concrete is applied to the upper surface. On the other hand, the lower filling chambers 23, 23,.
1. The side walls are closed by the partition walls 14, 17, 17, and the upper surface is closed by the intermediate upper plate 16. Drain holes (guide pipe installation ports) 16a, 1
6a... Are provided for each of the lower filling chambers 23, 23.
The drain holes 16a are closed with concrete after filling.

In addition, a water-repelling chamber 21 is formed in an upper part on the outer peripheral side (an upper part on the inner side of the outer cylinder wall 11) of the high-order filling chamber 22.
The top plate 19 is provided on the upper surface of the water play chamber 21. In the upper part of the outer cylinder wall 11 with respect to the intermediate upper plate 16,
A large number of seawater circulation holes 11a, 1
1a are provided.

Incidentally, the outer cylinder wall 11, the inner cylinder wall 13, the end wall 1
5, the intermediate upper plate 16 and the top plate 19 are formed of a steel-concrete composite plate, the partition walls 14, 17, 17... Are formed of steel plates, and the intermediate upper plate 16 is formed of an outer cylinder wall 11, an inner cylinder. Since it is manufactured together with the wall 13, the end wall 15, and the like, the quality is high as compared with the case where the work is performed after filling.

In order to fill the caisson, the guide pipe 39 is connected to each drain hole 16a of the intermediate upper slab 16 and installed in the water play chamber 21 before the caisson is installed.
A drain pipe 36 and a submersible pump 37 are installed in each guide pipe 39. Also, the injection pipes 31, 31,.
2 is installed in the high-order filling chamber 22 so that the turbine pump 33 is disposed obliquely above the sand flow hole 14 a of the partition wall 14.
Is installed on the top plate 19, and the water supply pipe 34 and the submersible pump 35 are installed in the free water chamber 21.

Then, after the caisson is installed, the filling sand 40 such as marine sediment is injected into the high filling container 22 filled with water from the open upper surface through a hoist or the like. Then, the filling sand 40 in the high filling room 22 is filled with the sand circulation holes 14 a of the partition wall 14.
Is reached, the remaining water is drawn from the upper part of the lower filling chambers 23 through the submersible pumps 37, 37, and circulated to the higher filling chamber 22 through the drain pipes 36, 36. Then, from the high filling room 22 to the low filling room 23, 2
3 is formed, and the filling sand 40 is mixed with the water from the higher filling room 22 through the sand circulation holes 14a.
Flows into. Therefore, compared to the conventional closed caisson filling method using water, the sand filling in the caisson can be performed with a smaller facility.
Can be made to flow.

Further, water is jetted downward (on the side of the sand flow hole 14a) from the nozzle 32 at the tip of the jet pipe 31 so that the sand flow hole 1
Stir the filling sand 40 near 4a. Then, the filling sand 40
Is press-fitted into the lower filling chamber 23 through the sand circulation hole 14a, and the clogging of the sand circulation hole 14a is prevented, so that the inflow of the filling sand 40 into the lower filling chamber 23 is promoted. Therefore, when the heights of the high filling room 22 and the low filling rooms 23 are different, or when the intermediate upper plate 16 is provided with a sand injection hole,
Even if it is difficult in design to provide a large number of sand circulation holes 14a in the partition wall 14, even if the high filling room 22 and the low filling room 23, 2
3. The filling sand 40 can be efficiently filled at a high filling rate.

In the above-described embodiment, the case where the lower filling room is disposed beside the high filling room is described. However, the lower filling room is disposed below the higher filling room. You may. Further, in the above-described embodiment, the case where the filling sand is introduced into the high filling room from the upper opening portion of the high filling room is described. The filling sand may be made into a slurry and injected into the high-order filling room.

[0017]

[Example] Spillage of waste water accompanied by suction (forced discharge) of sewage from the lower filling room and water injection around the sand circulation hole of the higher filling room.
A model experiment was conducted on the water injection system, the spillage system with only spillage from the lower filling room, and the natural injection method without both spillage and water injection. The sand filling rate is about 92.6 in the spillage suction / water injection method.
９５95.6%, about 77.1 to 85.2 by spillage suction method
%, About 67.6% in the natural input method.

[0018]

As described above, the caisson water filling method according to the present invention is characterized in that the lower filling chamber whose upper part is closed by the intermediate upper plate and the lower filling chamber by the partition wall having the sand circulation hole are mutually connected. About caisson with partitioned high-order filling room,
Fill or inject the filling sand into the upper filling room, draw the spillage from the upper part of the lower filling room to form a water flow, and supply water to the upper or side part of the sand circulation hole in the higher filling room. By injecting and stirring the filling sand around the sand circulation hole, the filling sand in the higher filling room flows into the lower filling room through the sand circulation hole,
The high-order filling room and the low-order filling room can be efficiently filled with the filling sand at a high filling rate.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a caisson water filling method according to the present invention.

FIG. 2 is a plan layout view of FIG. 1;

FIG. 3 is a conceptual diagram showing an example of a conventional closed caisson filling method in a stream.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Outer cylinder wall 11a Seawater circulation hole 13 Inner cylinder wall 14 Partition wall 14a Sand circulation hole 15 End wall 16 Intermediate upper plate 16a Drain hole 17 Partition wall 19 Top plate 21 Water play room 22 High filling room 23 Low filling room 31 Injection tube 32 Nozzle 33 Turbine pump 34 Water supply pipe 35 Submersible pump 36 Drain pipe 36 37 Submersible pump 39 Guide pipe 40 Filling sand

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuhiko Takezawa, 2-3-1, Kasumigaseki, Chiyoda-ku, Tokyo, Japan Coastal and Disaster Prevention Section, Port and Harbor Bureau, Ministry of Transport (72) Inventor Yoshinobu Shintaku 2-5-1 Higashi Odori, Niigata City, Niigata Prefecture Goyo Construction Co., Ltd.Hokuriku Branch Office (72) Inventor Iwao Kasahara Osaka City, Osaka 4-1-1, Komaribashi-ku, Toyo Construction Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 23/02

Claims (1)

(57) [Claims] 1. A caisson water filling method in which filling sand is filled with a water flow, wherein the caisson comprises a lower filling chamber closed at the top by an intermediate upper plate, and a partition having a sand flow hole. Comprising a chamber and a high filling room separated from each other, injecting or pouring the filling sand into the high filling room, forming a water flow by sucking residual water from the upper part of the low filling room, Water is sprayed upward or to the side of the sand circulation hole in the high filling room to agitate the filling sand around the sand circulation hole, and the filling sand in the high filling room is filled with the sand. A caisson water filling method, characterized by flowing into the lower filling chamber through a flow hole.