JPS6149026A - Construction work of structure such as caisson on sea - Google Patents

Abstract

PURPOSE:To easily construct a structure up to a given height on sea through a crane device detachably provided to a structure manufactured on a base box on the sea. CONSTITUTION:First lot of caisson 3 is built up on a base box 2 landed on a mound 1, and a crane device 6 is assembled through a base 8 and a post 9 on the caisson 3. Form panels 10 are carried in by the crane device 6 and assembled, and concrete is placed to build up the second lot of caisson. The base box 2, together with the caisson 3 and the crane device 6, is floated, towed to a place of deep sea, and sunk to float the caisson 3. The caisson 3 so floated is towed and settled on the second mound 11 to build up third and fourth lots of caisson through the crane device 6 and a concrete hose 12.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for constructing structures such as caissons on the sea.

(Prior Art) Conventionally, when manufacturing caissons on the sea, so-called floating dock construction methods, Taitoyo style dolphin dock construction methods, etc. have been used. When manufacturing a caisson using this construction method, the inner formwork, outer formwork, reinforcing bars, and other manufacturing materials are moved inside the box stand using a crane installed on the quay, a crane ship, or a crane installed on the box stand itself. They are transported to the designated work site and perform a series of operations such as assembling the formwork, pouring concrete, and removing the formwork.In each case, the crane's working radius becomes long and a large crane is required.
This method has the drawbacks of being uneconomical and having poor work efficiency.

In addition, when installing a large crane on the box stand itself,
In order to safely and reliably support this crane, the box stand itself needs to be larger and heavier, which has the disadvantage of requiring a great deal of time, cost, and labor to manufacture and tow the box stand.

(Object of the Invention) The present invention has been proposed in view of the above points, and its purpose is to install a crane device on the structure itself such as a caisson, and use this crane device to perform the main part of the construction work. This makes it possible to carry out the desired construction work extremely efficiently and easily, not only at work sites near the quay, but also at locations quite far from the quay, without relying solely on large cranes with a long working radius. -The box stand is made smaller and lighter by making the container device smaller.
The object of the present invention is to provide a construction method for structures such as caissons at sea, which makes it possible to reduce the time and economic burden required for manufacturing and towing box stands.

(Structure of the invention) The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. First, FIG. 1(a) shows a case where a caisson 3 is placed on top of a box stand 2 which is bottomed on a first mound 1 by pouring water into the inside. Structure 1
This figure shows a state in which a ground plane 5 is constructed with a ground plane 5 installed on a quay 4.

At this time, an anchor bolt 7 for fixing a crane device l, which will be described later, is embedded in approximately the center of the caisson 3. Although not shown, for example, even if the caisson 3f is in an unhardened state, it is possible to install the crane device -6- by embedding the anchor bolt 7 in the box stand 2. In this case, It is necessary to cut the anchor bolt 7 and separate the caisson 3 and the box base 2 in the step shown in FIG. 1(f) described later.

Next, as shown in FIG. 1(b), a crane device such as a tower crane is assembled by means of a ground crane 5 on top of the caisson 3 after the 10 casts have been cast, via a pedestal 8 and a post 9.

Then, using the crane device 5 on the caisson 3 as shown in FIG. Build an eye.

The plan view at this time is shown in FIG. 1 ((1)).

Next, as shown in Figure 1(e), the 30th reinforcing bar,
After assembling the formwork 10, drain the water in the box stand 2 and remove the box stand 2.
The vessel was floated using caisson 3 and a crane system during the day and towed to a deep water area.

Thereafter, as shown in FIG. 1(f), water is poured into the inside of the box stand 2 to sink the box stand 2 into the water, and the caisson 3 is separated from the box stand 2 and floated.

Therefore, as shown in Figure 1 (()), only the caisson 3 is towed above the second mound 11, which is slightly deeper than the first mound 1, and water is poured into the inside of the second mound 1, and the caisson 3 is moved to the second mound 11.
It is sunk on the mound 11 and a 30- or 40-piece caisson 3 is constructed using a crane device 6 and a concrete hose 12.

Figure 1 (1)) shows the crane equipment and debris being dismantled by the crane ship 13 after 40 pieces of the caisson 3 have been constructed, and then the water inside the caisson 3 is drained, the caisson 3 is floated, and the caisson 3 is brought to the surface. Installation involves towing Caisson 3 to the location and sinking it.

In this case, the crane ship 13 only needs to have a working radius that allows the crane device 5 installed approximately in the center of the caisson 3 to be removed, and a relatively small one is sufficient.

In addition, in this embodiment, a case has been described in which the first and second mounds 1 and 11 having different water depths are used, but the whole process can be carried out using only the mound 1, which is relatively deep near the quay 4. Needless to say, in that case, it is necessary to first moor the box stand 2 to the quay wall 4 in some way and keep it stable.

Further, the steps shown in FIGS. 1(e) and 1(f) can also be realized by using a so-called synchrolift.

Next, FIGS. 2 and 3 show a second embodiment of the present invention. This embodiment is characterized in that a crane device is installed above the caisson via a support 14 and a traveling girder 15 so as to be movable vertically and horizontally.

First, in FIG. 2, the four corner chambers a1 to a4 defined by the partition wall 3a of the caisson 3 have pillars 14tf".
(e) and are fixed to the caisson bottom plate 3b by means of fixing means such as poles.

Further, a pair of crane running girders 15 extending parallel to each other is provided above the supporting columns 14 that form a pair with each other, and the crane main body can move the upper part of the caisson 3 via these crane running girders 15 as shown in FIG. 2 (1)). It is provided so as to be movable in the x-x' force direction. In this case, it goes without saying that the number and arrangement of the struts 14 and crane running girders 15 may be changed as appropriate depending on the size of the caisson 3, the weight of the crane body, etc.

The crane device -6-° also includes a saddle 17 that is movable along the crane running girder 15 via rails and wheels 16 provided on the crane running girder 15, and a saddle 17 that is movable along the crane running girder 15.
A crane traverse beam 18 extends orthogonally to the crane travel girder 15 at the upper part of the crane traversal beam 15, and the crane traversal beam 1
8 along YY' force direction in FIG. 2(b), and a winding drum 22 having a drive motor 21 and a hook 23 provided on the upper part of the club 20. Therefore, the club 20 is X-X', Y-Y
The caisson 3 is movable in the force direction, and is configured such that the hook 23 and the like, which can be raised and lowered via the winding drum 22 and rope, can be positioned at a desired location on the caisson 3. Note that FIG. 2(C) shows a state in which the formwork 10, such as an outer formwork or an inner formwork, is suspended by hooks 23.

Next, the construction method in this example will be sequentially explained.

First, Fig. 3(a) shows a state in which a structure such as a caisson 3 is being constructed on top of the box stand 2 which has bottomed out on the first mound 1, and the bottom of the box stand 2 is inside. This is done by pouring water into the In this case, the construction work can be carried out by the crane device 5' installed in the caisson 3 in advance without using any external crane. In addition, 24 in the figure is a material transport/S vehicle.

FIG. 3(b) shows a case where the caisson 3 is towed, and the inside of the box stand 2 is drained in the same manner as described above, and the box stand 2 is floated and towed.

However, after towing box stand 2 to the predetermined location, the third
As shown in Figure (C), water is poured into the box stand 2 to separate the caisson 3 and the box stand 2 on the sea, and the caisson 3 is floated on the sea.

FIG. 3 ((The figure shows a state in which the floated caisson 3 is placed on a second mound 11' installed separately, and the caisson 3 is fixed by pouring water into the caisson 3. Then,
In this state, the caisson 3 is further built to a predetermined height.

In addition, in FIG. 3(d), 25 indicates a barge.

In each of the above steps, the crane device 6-' is moved as appropriate in the direction of Figure 2 (b) (7)
/JjJ It goes without saying that Caisson 3 will be constructed.

When the construction of the caisson 3 is completely completed, as shown in FIG.

Next, as shown in FIG. 3(f), the interior of the caisson 3 is drained, and the caisson 3 is floated again and towed to a predetermined position.

Figure 3 (g) shows that the construction of the caisson 3 has been completed and the caisson 3 has been placed in the submerged position, and a part of the caisson 3 is covered with gravel.
6, etc., while the crane device installed inside the caisson 3 is being removed by another ground crane 27. In addition, the removal of the crane equipment
As shown in Figure 3(e), this may be done when removing the outer formwork and inner formwork, and the removed crane equipment may be reused when manufacturing other caissons. Alternatively, it can also be used for assembly work in a completely different facility.

(Effects of the Invention) As described above, according to the present invention, a detachable crane device is provided on a structure such as a caisson that is installed on the sea and is built on a box stand, and Since the structure is built to a predetermined height, the crane device installed on the caisson can be relatively small and lightweight with a short working radius or travel distance, making the crane device itself inexpensive. In addition, it facilitates the assembly and disassembly of the crane device, and has the effect of improving the efficiency of a series of structure construction operations, including these operations, from transporting materials and equipment to dismantling them.

In addition, since there is no need to install a large crane on the box stand itself as in the past, there is no need for a large and highly buoyant box stand, reducing the time and economic burden required for manufacturing and towing it. There are advantages that can be achieved.

In particular, with this construction method, when the caisson itself floats up during the construction of the caisson and reaches a height where it can be built with its own blade, it can be immediately separated from the dock and constructed, so this also makes it possible to construct the caisson on a dock with relatively low buoyancy. This makes it possible to simplify construction equipment.

Furthermore, the crane device can be reused and a large number of caissons can be constructed in a short period of time while also serving as a base lily, so it has economical effects.

[Brief explanation of the drawing]

FIGS. 1(a) to (h) are explanatory views of steps showing a first embodiment of the present invention, and FIGS. 2 and 3 show a second embodiment of the present invention. FIG. 2(a) is a cross-sectional view of the caisson, and the same figure (1
)) is also a plan view, the same figure (C) is also a side view, and the third
Figures (a) to (0) are explanatory diagrams of the steps.

Claims (1)

[Claims] A structure such as a caisson that is built on a box stand set on the sea is provided with a detachable crane device, and the structure is built to a predetermined height on the sea via this crane device. A construction method for caisson-like structures on the sea.