JPH09302918A - Dry working caisson - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount and demount this dry working caisson to and from a structure in the sea regardless of a tide level, and reduce time loss at the assembly by constitut ing the dry working caisson of two vertically split split bodies and forming the dry working caisson of a breakwater functioning as a float in combination in an upper section, a work area in an intermediate section, and a ballast tank in a lower section. SOLUTION: When a working caisson is difficult to be installed due to a high tide level when the two vertically split split dry working caissons are moved to the lower section of a quaywall pier A, valves 9, 10 for ballast tanks 8 are opened, seawater is introduced, and buoyancy is adjusted. Since the working caissons are floated under an oblique state, repair steel-pipe piles B are held by guides 6, and the working caissons are fixed by lever blocks 11. Lower lever blocks 14 are clamped, flanges 15 are conformed, and bolts I are temporarily tightened. Air is introduced into a ballast tank 12 and the working caissons are floated, bearing blocks E are held among the working caissons and the pier A and fixed by buoyancy, and seawater is discharged by a drain pump H. Accordingly, the working caissons can be mounted and demounted to and from a structure in the sea regardless of the tide level, and time loss at the assembly can be reduced.

Description

Detailed Description of the Invention

INDUSTRIAL APPLICABILITY The product of the present invention is used on the surface of water and in water.
Repair of quay pier piles, which are important structural points of quay structures,
A dry work box for reinforcement.

2. Description of the Related Art A conventional underwater work box has a complicated structure, and it takes time to attach and detach the device. Moreover, since the work was performed in a closed manner, the workers in the work box had excessive mental stress.

[Means and Actions] By simplifying the structure of the conventional underwater work box, the manufacturing cost can be reduced, the manufacturing process can be simplified, and the working efficiency can be improved. When installing the work box, by using a hard sponge for the packing of the flange of the work box, a small amount of bolts can be tightened, but the airtightness is increased and the work efficiency is increased. In addition, drainage hose is attached to the work box body to facilitate drainage work. Since this work box has a ballast tank, it can be made to freely float up and down, regardless of the tide level under the port structure (such as a pier on the pier). Also, the work can be performed comfortably without causing the worker to feel mental stress.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings, in which repair work and reinforcement work of a corroded part of a steel pipe pile of a steel pipe pile jetty are carried out in a dry work box. FIG. I is a basic three-dimensional view of a dry work box. The work boxes that are symmetrical to the left and right are operated by one set. The details of FIG. 1 will be described later.
The figure shows the installation of the dry work box, A is the pier, B is the repaired steel pipe, C and D are the dry work box body E, the supporting board or hydraulic jack for height adjustment, and Figs. 3 and 4 are It is a figure of the process of installation on the sea surface. As can be seen in FIG. 3, the dry work box floats slightly above the sea surface, and the dry work box has buoyancy with the ballast tank II in FIG. Fig. 4 shows the state where the flanges are fitted together, and then adjust the height,
Inject air into III of the figure to fix the dry work box. Detailed explanation of Fig. 1, before the work, the size of the steel pipe pile (passage,
Set the spacer and guide shown in Fig. 1 according to the size of the steel pipe pile according to the outer circumference).
As explained in the detailed drawing of the section, insert packing between the guide and the bottom of the dry work box, and tighten the bolts. There are various sizes of steel pipe piles, and this work box can repair almost all steel pipe piles with one work box by making guides according to the size of the steel pipe piles. Next, fix the repaired steel plate to the outer wall of the work box in advance with a lever block or the like. The work box with the repair steel plate set is unloaded to the sea by a truck crane. Next, move the dry work box to the repair steel pipe. At that time, lower the work scaffolding and guide at the top of the work box, and perform work while moving on the guide or on the deck. The guide part is expander metal, the deck part is non-slip, so that it does not slip easily,
There are hands who give it. When moving the work box to the bottom of the pier, if the tide level is high and it becomes difficult to install the work box, use the ballast tank adjustment valve ▲ 10 ▼ above the work box to adjust the work box. Valve ▲ 1
Open ▼ to add seawater to adjust buoyancy. To add buoyancy to the work box, add medium pressure air from the valve to drain seawater from the valve ▲ 10 to increase buoyancy. I can help you. The work box with adjustable buoyancy is set on the repair steel pipe. The figure is Fig. 3. Since the work box floats on the sea surface in an oblique state, the repair steel pipe is set with a guide so that it is pinched. Lever block (11)
Do 2 pieces (on the other side). The installation work from now on will be carried out by the diver. The diver will close the valve (13) located in the ballast tank (12) below the work box. This valve will discharge the air from the ballast tank when the work box is lowered to the sea. It is opened to do so, then tighten the lower lever block (14) and tighten the flange (15). The part where the flange part touches the repair steel pipe is pre-treated with a diver by a diver, if the flange is fitted , Temporarily tighten the bolt (I). If there is a case where the flange holes are aligned and the bolt hole (16) does not fit, air is introduced from the opening (16) at the bottom of the work box and the height of the work box is adjusted. I do. Next, adjust the position (height) of the work box,
Attach the support board or hydraulic jack on the deck of the work box.
The deck of the work box is approximately 50 cm to 60 cm above the highest tide between the pier A and the pier in Fig. 2. If there is this height, seawater will enter the work box due to a few waves or wake waves. When the height can be set, air is put into the ballast tank (12) at the bottom of the work box from the opening (17) and the work box is floated. It is fixed by buoyancy, and then the temporary tightening bolt is finally tightened. The torque of the final tightening is the packing between the flanges.
The torque is enough to crush ▼, and the packing is a hard sponge, so it is very familiar, so there is no need to tighten it strongly. A drain hose (4 inches) G is attached to ▼. This drain hose may be attached on land in advance. Next, open the drain valve in the work box and drain seawater with the drain pump H on land. As the seawater in the work box disappears, the airtightness of the packing increases due to water pressure, and the water leakage also disappears, and the buoyancy also increases. Is enough. When drainage is complete, tighten the drain valve and retract the upper guide to complete the installation work. Next, we start repairing steel pipes. Welding is performed by a welder who has a JIS qualification for quality control. Equipment and materials required for the work are carried into the work box by the raft. The worker's work box is moved in and out by a trap (19). The feature of this work box is that the upper part is opened in order to solve the problems of the conventional underwater work box. For this reason, it is very easy to carry in and out the equipment, and the workers can move in and out very easily.In addition, there is a feeling of liberation and the mental stress of the workers inside is not felt, and the ventilation of the work box is perfectly performed. Therefore, the health of workers can be taken into consideration. The worker sets the repair steel plate at a position designated in advance and completes the work. If necessary, a welding inspection (penetration exploration test, etc.) is carried out, and at this point a better quality control is carried out by performing anticorrosion processing. The work inside the work box and the tidying up are all completed, and the work box is disassembled. First, the air in the lower ballast tank is bleeded by the valve (13), and at the same time seawater enters the work box, the bolts on the flange are removed by the diver, and when the sea water in the work box becomes the same level as the outside sea surface, the work box becomes Buoyancy is lost. Since the work box is on the surface of the sea as shown in Fig. 3, it is easy to split into two and the time until the next work can be shortened. This completes one process, and the same process can be repeated thereafter. As mentioned above, each work is easy,
Moreover, since it is possible to take charge of work in a specialized field, it is a dry work box that allows better quality control. (Effects of the Invention) The present invention reduces the time loss at the time of assembly and disassembly by vertically dividing the main body into two parts, and makes it possible to adjust the buoyancy of each unit independently of the tide level. In addition, it can be attached to and detached from the structure, and it can be used for various steel pipe piles by changing only the spacer while leaving the main body as it is, leading to cost reduction at the time of manufacturing, and making the unit flange packing a hard sponge. , The packing itself has flexibility, and the waterproofness of the joint is increased. The drainage in the work box is performed by the drainage system installed on land, which also eliminates electrical troubles. Since the work box is also fixed by buoyancy, it does not take time. Since the upper part of the work box was released, mental stress of the workers in the work box was eliminated, and a comfortable work space could be obtained.

[Brief description of drawings]

Fig. 1 is a perspective view showing the main part of the dry work box, Fig. 2 is a completed drawing with the dry work box installed on the pier pier on the quay, and Fig. 3 is moving the dry work box to the pier pile and the work box is on the sea surface. FIG. 4 is a diagram showing a floating state, and FIG. 4 is a diagram showing the work box temporarily installed on the pier pile from the state of FIG. A ... Quay pier, B ... Repair steel pipe pile, C / D ... Work box body,
E ... Support board or hydraulic jack, F ... Sea surface, G ... Drain hose, H ... Drain pump, I ... Tightening bolts ・
Nut, I ... Work box upper ballast tank, II ... Work box lower ballast tank, ... Spacer / guide, ... Work box lower part, ... Packing, ... Bolt / nut, Work box outer wall, ... Work scaffolding / guide, ... Deck, ... Work box upper ballast tank, ▲ 10 ▼ ... Ballast tank adjusting valve, ▲ 11 ▼… Lever block, ▲ 12 ▼… Work box lower ballast tank, ▲ 13 ▼… Valve, ▲ 14 ▼
... Lever block, ▲ 15 ▼ ... Flange, ▲ 16 ▼ ... Bolt hole, ▲ 17 ▼ ... Opening, ▲ 18 ▼ ... Drainage flange / valve, ▲ 19 ▼ ... Lifting ramp, ▲ 20 ▼ ... Hard sponge packing.

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[Procedure amendment]

[Submission date] August 14, 1996

[Procedure 3]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

[Fig. 2]

[Figure 3]

FIG. 4

Claims (1)

[Claims] The dry work box, which is the product of the present invention, is formed by a divided body that is vertically divided into two parts, and the completed form is an open box type.
A ballast tank for adjusting buoyancy is attached to itself. Since the joint surface of the dividing part is more airtight than the conventional one, a hard sponge is adopted.The work box is formed from the work area in the upper part, the work area in the middle part, and the ballast tank in the lower part. After assembling the box, a drainage hose attached to the bottom of the box is used to drain the inside of the box to secure a working area.