JPS5826446B2 - Shoring method for floating structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shoring method for pouring concrete on the upper part of a pier when constructing a floating structure such as a pile hole pier in a harbor.

When constructing a pier, etc., piles are first driven into the water bottom, and when placing upper concrete such as beams and slabs on the part of the top of the pile that protrudes above the water, supports are used to support the formwork for concrete pouring. It is necessary to support the work on piles.

Conventional shoring for this type of construction involves installing a gusset plate 21 protruding from a pile 20, fixing a bracket 22 to this, and assembling a support frame 23 on top of the bracket 22, as shown in Figure 1A. Alternatively, as shown in the opening in Figure 1, suspend the bracket 22 from the gusset plate 21 with the suspension bars 24, assemble the support frame 23 on top of it, erect a support etc. between the support frame 23 and the formwork, and then The formwork was being assembled.

However, the above work was carried out on water and the footing was poor.
Assembling the shoring requires a considerable amount of time, and dismantling the shoring requires work in a narrow space between the water surface and the bottom of the structure, making the work difficult and dangerous.

Moreover, since these operations are affected by tide levels and waves, there are problems such as being subject to time constraints.

In particular, when constructing a large-scale pier, the shoring used in one location must be dismantled individually after the concrete has solidified, and then moved to the next location and reassembled to extend the pier in sequence. However, the dismantling, moving,
There were problems such as the large amount of labor required for assembly, which significantly affected the construction period.

The present invention aims to provide a method for shoring a floating structure that can be easily installed, removed, and moved safely, quickly, and with less labor when performing such shoring. Its gist is that it is a float-type support in which a number of vertical members are erected on a float whose buoyancy can be adjusted by freely pouring water into the interior, and a horizontal frame is fixed to the upper end of each vertical member. The construction frame is towed between the structure support piles that protrude above the water surface, and the floating type shoring frame is removably fixed to the support piles at a predetermined height, and the floating type shoring frame is horizontal. A method for shoring a floating structure is characterized by assembling the formwork of the floating structure by supporting it on a frame.

Next, embodiments of the present invention will be described with reference to the drawings.

1 in the figure is a float type shoring frame used in the method of the present invention.

This shoring frame 1 has hollow cylindrical floats 2, 2, which are made of steel pipes with both ends closed, arranged in parallel to each other at the bottom.

These floats 2, 2 can be freely filled with water using a pump, and their buoyancy can be adjusted.

Also, since an air hose is attached, the buoyancy can be adjusted by filling in compressed air.

Both floats 2, 2 are connected by horizontal members 3, 3..., and a large number of vertical members 4, 4 are provided on the upper surface thereof.
...... is erected, and its vertical members 4, 4...
- A horizontal frame 5 is connected to the upper end of the frame.

These members are integrated by welding, bolting, etc. so that they can maintain a constant shape even against external forces.

Further, the buoyancy of the floats 2, 2 is set so that when the floats are at maximum buoyancy, they float above the water surface with each member 3.4, the horizontal frame 5, etc. mounted thereon.

Also, when using it as a shoring, most of the load of the shoring frame itself is carried by the buoyancy of the floats 2, 2, and the floats 2, 2 are always submerged in the water. Set the buoyancy of floats 2 and 2.

As shown in Fig. 3, the floating type shoring frame 1 constructed in this way is floating on the water and has piles 6, 6, . Tow.

Then, as shown in Fig. 4, water is poured into the floats 2, 2 at predetermined positions between the piles 6, 6, . Submerge it until it reaches the bottom.

In this state, the horizontal frame 5 is fixed and suspended from the upper ends of the piles 6, 6, . Fix it using a square piece 8 or a jack up device to prevent it from moving in the horizontal direction.

Thereafter, water is further poured into the floats 2, 2, and the buoyancy of the floats 2, 2 is set so that the downward load on the shoring 1 is somewhat larger than the buoyant force acting on the entire shoring at the highest water level.

This prevents the force of pushing up the shoring due to buoyancy even at the highest water level, so that the upper surface position of the horizontal frame of the installed shoring remains unchanged.

After supporting the support frame 1 on the piles 6, 6, . . . in this way, as shown in Fig. 5, the support frame 1 is
Supports 10, 10... are placed between the frame 9 of the structure and the
to complete the installation of shoring.

After installing the shoring, formwork is assembled and concrete is poured.

During the period from curing to removal of the shoring, the buoyant force acting on the entire shoring constantly increases or decreases depending on changes in the tide level, but when it decreases, the suspension bars 7 carry the load corresponding to the decrease in the buoyant force.

Also, when removing this support, the support should be 10°10.
After removing the formwork 9, pour water or drain water into the float 2.2 to create buoyancy so that the support frame 1 floats at a height that prevents the horizontal frame 5 from colliding with the lower surface 11 of the structure. After adjustment, the suspension bars 7 are cut and the vehicle is towed to the next installation location.

Further, in the above embodiment, supporting columns 10, 10, etc. are interposed between the horizontal frame 5 and the formwork 9 of the structure, but as shown in FIG. .

10... The horizontal frame body 5 is formed into a formwork 9 without using...
The formwork 9 may be supported by directly contacting the square material 12 on the lower surface.

Note that the mark in the figure indicates the lowest tide level, and the mark H indicates the highest tide level.

The present invention is configured as described above, and uses a float type shoring frame when shoring a structure on water.

A horizontal frame body for shoring is integrated and provided at the upper end of the support frame, and this can be moved by floating on the water and easily fixed at a predetermined height position of the pile or removed. Compared to conventional methods, the labor required for positioning, fixing, and removing is significantly reduced, and dangerous manual work on the water is no longer required, and the work can be done easily even when there are some waves, shortening the construction period. , improvements in work efficiency and work safety can be achieved.

[Brief explanation of the drawing]

Figure 1 A1 is a partial front view showing how the horizontal frame is installed in conventional shoring, Figure 2 is a perspective view of the float type shoring frame used in the present invention, and Figure 3 is the present invention. Fig. 4 is a front view showing the state before the shoring frame is fixed, Fig. 5 is a front view showing the state after the formwork is erected, and Fig. 6 is a front view showing the state before the shoring frame is fixed. It is a front view which shows the state after the formwork of still another example is erected. 1...Float type shoring frame, 2...Float, 4...Vertical member, 5...Horizontal frame, 6... Pile, 7... Hanging bar, 9... Bottom plate formwork of the structure, 10... Pillar, 11... Lower surface of the structure, 12... Square timber.

Claims (1)

[Claims] 1. A float-type shoring frame is constructed by erecting a number of vertical members on a float whose buoyancy can be freely adjusted by freely pouring water inside, and by fixing a horizontal frame to the upper end of each vertical member. The float type shoring frame is removably fixed at a predetermined height with respect to the support piles, and is supported on the horizontal frame of the float type shoring frame. A method for shoring a floating structure, characterized by assembling formwork for the floating structure.