JPS6231593A - Riprap leveling weight guide ship - Google Patents

Abstract

PURPOSE:To make the falling position of a weight for leveling ripraps accurate and carry out an operation efficiently by fitting said tower-form weight into a guide opening formed on a buoyant body and lifting up and down said tower- form weight with a crane ship. CONSTITUTION:An opening part is formed in the center of a buoyant body 6 and a weight 1 formed into a tower shape is fitted into the opening part and guided. The buoyant body 6 is installed in place by means of wires 63, 65, and a crane chip 2 is placed adjacent to the buoyant body 6 to carry out the lifting up and down of the tower-form weight 1. Since the weight 1 is lifted up and down being guided by the opening part of the buoyant body 6 installed in place, its falling position can be accurately determined. Also, by measuring the marker 1a of the tower-form weight 1, the progress of the leveling operation can be grasped, carrying out an operation efficiently.

Description

Detailed Description of the Invention (a) Technical field This invention relates to a weight-type rubble leveling method for compacting and flattening the top of a rubble foundation for installing heavy structures such as breakwaters on the sea. Concerning the guide boat used.

(b) Summary of the Invention The weight guide boat for leveling rubble according to the present invention is fixed on the sea so that the opening is located above the rubble, and is dropped by a hoist to level the rubble. A tower-shaped weight is guided through this opening to ensure accurate fall and accurate position measurement. Furthermore, this prevents the weight from falling.

(C1 Explanation of the conventional technology and its disadvantages of rubble foundations) The rubble foundations, which are often used for the foundations of port structures such as breakwaters, are made by dumping tens to hundreds of kg of stones into the seabed and creating trapezoidal cross-sections. A heavy structure such as a caisson is usually installed on this foundation, but in order to ensure the stability of the installation, the top of the rubble foundation was leveled during the foundation work. There is a process to

<Traditional leveling method> The conventional method of leveling rubble is that a diver uses his own blade or a submersible's winch to supplement or reassemble missing stones. Met. This type of leveling work performed by divers is inefficient because it is manual work under the sea, and the finish of the work is uneven due to turbidity in the sea and differences in the skills of the divers, which is a bottleneck in underwater foundation construction. It often happened. In addition, although the accuracy of leveling is an important factor that affects the stability of the superstructure, 1. There is no way for the person in charge of the work to directly check the condition of the leveled stones (generally, the person in charge of the work and inspectors do not have diving skills), and there is no way for the person in charge of the work to visually check the condition of the leveled stones (in general, the person in charge of the work and inspectors do not have diving skills), so it is difficult to check by staff with diving skills or to survey from the back side. The current situation was that they had no choice but to rely on the reports of the divers who carried out the work. Furthermore, in the case of large-scale construction or when the leveling water depth is large, leveling itself by a diver becomes difficult.

〈Mechanized leveling method〉 A variety of work boat 2 work methods have been proposed to replace the above-mentioned work by divers with mechanical leveling work. This method allows for highly accurate leveling using simple equipment.

Weight-type rubble leveling method> Figure 3 shows a schematic diagram of the weight type rubble leveling method.

3 in the figure is a rubble section, of which 3a is a portion where the leveling work has been completed, and 3b is a portion where the leveling work has not yet been performed. The weight 1 is a steel ingot attached to the lower end of a turret made of copper angles and has a bottom of about 3 m square, and has a weight of about 45 tons. Supported. The hoist boat 2 lifts up this weight 1 and drops it from a height of 2 meters above the rubble section 3. By this falling, the upper part of the rubble part 3 is compacted and a flat top is formed. This operation is performed for the entire rubble section 3 to complete leveling.

In addition, mark 1a of tape etc. is placed on the part of the weight work above the water surface.
It will be installed and water $34 will be installed on the ground. mark 1
The mark la is attached so that the distance from a to the bottom of the weight is equal to the vertical distance from the level 4 to the top of the rubble foundation, and when the weight 1 falls onto the rubble part 3, the level 4 The height of the mark 1a is measured. As a result of the measurement, if the level difference between the mark 1a and the leveling instrument 4 is O, it can be seen that leveling of that part has been completed. in this way,
Build the weight 1 high into a tower shape so that it is above the sea surface,
By having the same function as a leveling rod, it is possible to check the leveling height without diving into the water and directly checking the top, and the person in charge of work can directly perform the work by looking at the level @4. can be given instructions.

In addition, as mentioned above, since tamping is performed during the leveling work, even if heavy structures such as caissons are installed on the foundation, foundation settlement can be minimized, and the crown during construction It is possible to easily calculate the excess height of

The ``weight type rubble leveling method'' is a powerful construction method with the advantages mentioned above.

<Disadvantages of the weight type rubble leveling method> However, even this method had the following disadvantages.

■The position at which weight 1 was to be dropped must be measured from the sea, but there was no accurate measuring method, and the position was roughly determined and dropped. Incidentally, divers who can indicate the drop position from the sea cannot dive near the work site during work due to disadvantage (2) described below.

■Due to tidal currents, etc., the weight 1 may not fall straight down.

For these reasons, it has been difficult to further improve construction accuracy. In addition, ■ If the hoist was operated incorrectly when it fell, weight 1 could fall, which not only posed a danger to the work but also potentially damaged the top, which had already been leveled.

Furthermore, the weight 1 does not necessarily stand exactly vertically even when it is in contact with the rubble part 3, which causes difficulty in measuring the top height using the leveling instrument 4. Ta.

(d) Purpose of the Invention The present invention has been made in view of the above-mentioned drawbacks, and provides a weight guide boat for leveling rubble that can carry out the safe and accurate weight type rubble leveling method. The purpose is to

(e) Structure and Effects of the Invention In summary, the present invention has an opening for guiding a falling weight suspended from a hoist ship, and means for fixing the weight at a fixed position on the sea. During the work, this opening is moved and fixed onto the rubble to be leveled, and the weight is fitted into the opening and dropped.

By configuring as described above, according to the present invention, the following effects can be achieved.

(2) Since the weight is guided by the opening, it can be accurately dropped to the target position.

■This allows you to accurately indicate the falling position of the weight.

■In addition to efficient positioning work, by making the opening large enough for the weight to move up and down, ■it is possible to prevent the weight from tipping over, and the opening Since the frame supports the weight, the weight always stands almost vertically, allowing accurate measurement of the height of the top from the ground.

In addition, since this weight guide ship for leveling rubble is located directly above the site (underwater) where leveling work is being performed, the person in charge of work and the manager The staff can be on board to perform front side and red surveying in parallel with the leveling work, and ■The advantage of being able to directly instruct work based on the measurement results, allowing for efficient construction management. also occurs.

(f) Embodiment FIGS. 1(A) and 1(B) are a plan view and a side view, respectively, of a weight guide boat for leveling rubble (hereinafter referred to as "guide boat") which is an embodiment of the present invention. . FIG. 2 is a schematic diagram of the weight type rubble leveling work using a guide boat according to the above embodiment. Schematic diagram of the conventional weight-type rubble leveling work mentioned above (No. 3
Portions having the same configuration as those in FIG.

An opening 60 is provided approximately at the center of the guide boat 6.

The opening 60 has a rectangular shape, and the short sides are long enough for the weight 1 to fit therein, while the long sides are long enough to allow the weight 1 to move. A frame 70 is formed around the opening 60, and a fender (not shown) is attached to the opening 60 side of the frame 70 to absorb the impact when the weight 1 falls. ing. Further, a guide 71 for guiding the fall of the weight 1 is attached to the frame 70 so as to be movable in the longitudinal direction.

By opening the opening 60 in this way and allowing the weight 1 to move together with the guide 71 within the opening 60, the belt-shaped portion of the opening 60 can be moved while the guide boat 6 is fixed at the same position. can be leveled at once.

Two windlasses 61.62 are installed on the guide boat 6, and wires 63.64 and 65.66 are installed on each.
is wound. Anchors are attached to the tips of these wires 63 to 66, and these anchors are hung at fixed points on the seabed. The guide boat 6 can be fixed at a predetermined position by appropriately adjusting the hooking position of the anchor and the length of the wire. Also,
Once fixed, the fixed position can be moved by adjusting the length of the wire. After fixing the guide boat 6 and leveling the band-shaped part of the opening 60,
By moving the guide boat 6 by the length of the short side of the opening 60, adjacent portions can be leveled. These windlasses 61, 62, wires 63 to 66, and anchors (not shown) correspond to means for fixing the guide lead plate of the present invention at a fixed position on the sea.

Further, windlasses 21 and 22 are also installed on the hoisting vessel 2, and wires 23 and 24 wound around these windlass 21 and 22 are hooked to hooks 68 and 67 attached to the guide vessel 6. There is. By adjusting the lengths of both wires 23 and 24, the hoist ship 2 is connected to the guide ship 6.
Move the side of the ship from side to side. By this movement and the rotation of the arm of the hoist, the weight 1 can be moved in the long side direction within the opening 60.

To perform the weight-type rubble leveling method using this guide boat 6: ■Hang the anchor of the guide boat 6 at an appropriate position (this position should be such that the wire straddles the rubble area where leveling work is to be performed). ).

- Move and fix the opening 60 to the position where the windlass 61 and 62 are to start leveling work (for example, when the opening 60 has a constant width and length of several tens to hundreds of meters, such as the foundation of a breakwater) (If so, the opening 60 is located across one end of the foundation.)

(2) The wires 23 and 24 of the hoist boat 2 are hooked to the hooks 67 and 68 of the guide boat 6, and the weight 1 is inserted into the opening 60.

(2) Drive the windlass 21, 22 and the hoist 20 to move the weight 1 to the work starting position (for example, to the left end of the opening 60).

- Drive the hoist 20 to drop a weight onto the rubble section 3 to level the top.

(2) Every time the above-mentioned leveling work is completed, the weight is moved within the opening 60, and the entire band-shaped portion in which the opening 60 is opened is leveled.

■ Once the weight 1 has finished leveling within the movable range within the opening 60, the windlass 61 and 62 are driven to move the opening 6
0 is moved to a position directly above the part to be leveled next (in the case of the above-mentioned breakwater example, it is moved laterally by the length of the short side of the opening 60).

■Repeat the steps from ■ to ■ until the leveling work is completed.

Leveling construction can be carried out through the above-mentioned work, and in parallel with this work, inspections, measurements, etc. can be performed on the guide boat 6, and construction management can be performed.

[Brief explanation of the drawing]

1(A) and 1(B) are respectively a plan view, a side view, and a second
The figure is a diagram schematically showing a weight type rubble leveling method using the above embodiment, and FIG. 3 is a diagram showing an outline of a conventional weight type rubble leveling method. 1 - weight, 2 - hoist boat, 3 - rubble section, 6 - weight guide boat for leveling rubble, 60 - opening, 61.62 - windlass, 63~6 low wire.

Claims (1)

[Claims] (1) A weight shaped like an oar is hung from a hoist boat,
A ship used in a weight-type rubble leveling method in which the rubble is dropped onto a rubble portion formed on the seabed to form a flat top portion on the rubble portion, the ship having an opening for guiding the weight, and an opening for guiding the weight; A weighted guide boat for leveling rubble, comprising: means for fixing the vessel at a fixed position on the sea;