JPS5949962B2 - Shoring method and equipment for construction of floating concrete structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shoring method and apparatus for constructing a floating concrete structure such as a pier or dolphin as a port facility.

Floating type shoring has recently been proposed as a shoring for concrete construction of the upper part of piers, etc.

As shown in Fig. 1, this floating type shoring is constructed by assembling vertical rows 1 made of long steel pipes and horizontal beams 2 that connect them in a ladder shape to form a shoring frame 3. The hollow part of the steel pipe is sealed so that the entire shoring structure can float on the sea.

To construct the upper part of the pier using such shoring, the frame 3 is attached to the piles 4 of the pier as shown in Figure 2e.
After constructing additional shoring 5 and formwork 6, the upper concrete 7 is poured.When installing floating type shoring, the frame 3 is floated on the sea and the second After pulling it between the piles 4 as shown in Figure (A), the frame 3 is lifted by a lifting device 8 such as a chain block as shown in Figure (B).
Shoring is installed by replacing it with hanging materials 9 such as steel rods.

This kind of conventional floating shoring has its own buoyancy, so it is installed at a location lower than the water level at high tide (then the part that makes up the float will be below the water surface, and its buoyancy will push up the formwork). Therefore, the shoring must be installed at a position higher than the water level at high tide.

Therefore, the conventional shoring installation work described above always requires a lifting device such as a chain block to lift the entire shoring structure, and it is also necessary to transfer the chain block to steel bars, etc. In addition, it is necessary to install the shoring in a position that is not affected by fluctuations in the water surface height due to the tide level, so the installation position of the shoring has to be higher.As a result, the space between the underside of the pier and the shoring becomes narrow, and the Work efficiency inevitably suffers because there is not enough work space.Furthermore, to remove the shoring, it is necessary to tow a large number of tie blocks, etc., just like when installing the shoring, and it is necessary to suspend the floating shoring. There were drawbacks such as the need for work to transfer the wood to a tea block.

In view of the above-mentioned conventional problems, the present invention eliminates the need for a lifting device such as a tie block to lift the entire shoring structure to a height unaffected by the tide level (( Providing a shoring method and equipment for constructing floating concrete structures that can be installed so that the buoyancy caused by fluctuations in water does not affect the shoring, and also allows for a wider work space for formwork erection, etc. than before. Its purpose is to:
The float that floats the frame on the bottom of the shoring frame, which cannot float by its own buoyancy, can be freely installed and removed between the piles for supporting floating concrete structures that protrude above the water surface. Tow the frame body floating above the water surface, and with the frame body floating above the water surface, use a hanging bracket attached to the frame material on the outer periphery of the frame body so as to be movable in the longitudinal direction. The float is fixed to a pile, and then the float is removed from the frame and supported along with putty on a stepladder set up on the frame to assemble a concrete form, concrete is poured into the form, and the concrete is cured. Thereafter, the float is reattached to the frame body, released from being fixed to the piles, floated, and pulled out from between the piles.

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

First, a third example of the shoring device used in the method of the present invention will be described.
8 to 8 will be explained.

In the figure, 20 is a support frame.

The frame 20 is made of hollow rectangular cylindrical steel material and has a substantially rectangular planar shape with a long frame 20a and a short frame 20b, and is so heavy that it cannot float by its own buoyancy.

Flows 21 formed into a rectangular parallelepiped using polystyrene foam are attached to the frame 20 at several locations, extending over a plurality of short frame members 20b.

This float 21 has a fixing frame member 22.22 on its upper surface, and the rod member 22.22 is attached to two short frame members 20b, 20.
F) Straddle the short frame material 20 by holding the number wire 23
Both ends are fixed to b.

The float 21 provides buoyancy to the frame 20 (7).

Incidentally, the float 21 may be a hollow tank-shaped object made of metal or rubber other than the above-mentioned styrene foam.

A large number of stepladder fitting protrusions 24 are protruded from the top surface of the long frame member 20a and short frame member 20b at regular intervals on the frame body 20, and a large number of stepladders 25 are fitted by fitting the lower end openings into the protrusions 24. It is erected.

This stepladder 25 is attached to the upper end of each support rod 25a in the axial direction 7. It has a jack consisting of two threaded shafts 25b, and a horizontal member 25c is fixed between the upper ends of the threaded shafts 25b.

On the other hand, hanging fittings 20 are attached to a plurality of locations on the long frame member 20a forming the outer peripheral edge of the frame body 200.

As shown in FIGS. 7 and 8, this hanging fitting 26 includes a substantially U-shaped steel strip 27 and a strip 21 thereof, which are wrapped around a long frame material 20a and attached so as to be movable in the longitudinal direction thereof. It consists of a pair of steel rod supports 28 fixed between both ends,
The supporting members 28 are made of steel members having a cross section of 100 mm, which are arranged back to back to each other, and a steel rod insertion gap 29 is formed therebetween.

Further, on the upper surface of the long frame member 20a, connecting member fasteners 30 for connecting other adjacent frames 20 are erected at regular intervals.

Next, Example 9 of the method of the present invention using the above-mentioned device will be described.
The following drawings will be explained.

In the figure, 31 is a steel pipe pile erected from the seabed with its upper end raised above the water surface (higher than the high water level L1 and low water level L2).

The float 21 is attached to the frame 20 mentioned above between the piles 31, and the boat is towed with the stepladder 25 erected on the upper surface.

When the water surface is higher than the normal lowest tide level, that is, at a position higher than the low water level 2, preferably at high tide, a hanging steel rod 32 is connected between the upper end of the frame 20 and the stake 31.

For this connection, as shown in FIG.
3, screw the nut 34 onto the steel rod 3], insert the lower end of the steel paulownia 2 into the steel rod insertion gap 9 of the above-mentioned hanging fitting 26,
This is done by screwing a washer 35 and a nut 36 under the support member 28.

Examples of the steel rod 32 used for this include a deformed steel rod with protrusions arranged in a spiral arrangement along its entire length, cut to the desired length, and a threaded steel rod with threads carved on both ends. Use.

In this way, a plurality of frames 20 are installed in parallel at the same height, and the frames 20 are connected to each other in the horizontal direction.

For this connection, as shown in FIG. 10, a connecting bolt 37 is inserted into the metal fitting 30 on the top surface of the long frame member 20a, and a nut 38 is tightened to connect the frames 20 to each other, and a wedge is formed between the hanging metal fitting 20 and the stake 31. 39 and fix it to the pile 31 in the horizontal direction as well.

In this way, with the frame body 20 floating on the water surface, the pile 3
1, and when the tide level decreases, the frame 20 moves to the steel rod 32.
This results in a suspended state, and a gap is created between the bottom and the water surface.

Therefore, the number wire 23 is cut and the float 2 is attached to the frame body 20.
Unfix 1, let it fall onto the water surface, and collect it.

By removing the float 21, the buoyant force that causes the frame body 20 to float on the water surface is removed, and the frame body 20 is supported by the piles 31 without floating even when the tide level rises next time.

Stepladder 2 on frame 20 suspended and supported in this way
Adjust the height of the horizontal member 25c with the screw shaft 25b of No. 5,
A formwork 41 is assembled and supported on the upper surface of the formwork 41 via square timbers 40 as appropriate.

Concrete 42 is poured into the formwork 41 on the shoring thus formed and supported by the piles 31 to construct a floating concrete structure.

After the concrete 42 poured into the formwork 41 has hardened, the stepladder 25 is removed and the formwork 41 is removed, and the bolts 37 horizontally connecting each frame body 20 are removed.

After that, the float 21 was moved to the frame 2 again in anticipation of the low tide level.
After pulling it under 0 and reinstalling it using wire number 23, Conch! , 1-) The steel rod 32 is cut at the lower surface position of 42, the frame body 20 is towed to the next construction location, and the shoring is assembled in the same manner as described above.

In the above embodiment, the float 21 is
and attaching and detaching the frame body 20 to and from the piles, but on a coast where the tides and tides are low, these operations are performed sequentially regardless of the tide level.

The construction method and device of the present invention are constructed as described above, and include a float? By removably attaching it to the shoring frame, fixing the frame to the pile while floating above water, and then removing the float,
It is no longer necessary to use equipment such as jacks to lift the frame to a height where it is not affected by tides, as in the past, and the equipment itself is simplified and costs are reduced, and the frame installation work can be done with jacks, etc. It is much simpler and less dangerous to work with than when it is suspended.

Furthermore, since the frame is not lifted up and held, it is possible to increase the distance between the frame and the concrete structure, and the ease of work when assembling forms and supporting materials and removing them has also been improved. be.

In addition, in the device of the present invention, by moving the hanging metal fittings in the longitudinal direction with respect to the frame body, even if the driving position of the pile is slightly different from the design, for example, it is easy to align the hanging connection position. This makes it easy to obtain a suspended state.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the main structure of a floating towed shoring used for conventional shoring, Fig. 2 is a front view showing the assembly process of the shoring, and Fig. 3 is a floating towed shoring of the present invention. A plan view of the device, FIG. 4 is a sectional view taken along the line 1-1 in FIG. 3, FIG. 5 is a partially enlarged side view with the stepladder attached, and FIG. 6 is a partially enlarged sectional view of the stepladder in the fitted state. , Fig. 7 is a vertical cross-sectional view of the hanging metal part, Fig. 8 is a cross-sectional view taken along the line 1-1 in Fig. 7, Fig. 9 is a front view showing the construction state of the method of the present invention, and Fig. 10 is a steel rod. FIG. 20... Frame for shoring, 20a... Long frame material, 20b
...Short frame material, 21...Float, 25...Stepladder,
26... Hanging fittings, 31-... Steel pipe piles, 32... Steel rods for hanging.

Claims (1)

[Claims] 1. A floating concrete structure in which a float for levitating the frame is removably attached to the bottom surface of a shoring frame that cannot float by its own buoyancy, and is erected so as to protrude from the water surface -E. The frame body is floated on the water surface -L and towed between the supporting stakes, and while the frame body is floating on the water surface, it is attached so as to be freely movable in the longitudinal direction with respect to the frame material on the outer periphery of the frame body. Then, remove the float from the frame and place it upright on the frame (support it on a stepladder, assemble a concrete formwork, and pour concrete into the formwork. Support for constructing a floating concrete structure, characterized in that the concrete has a hard flu, the float is reattached to the frame, the fixation to the pile is released, it floats, and it is pulled out from between the piles. Construction method. 2. Floats for floating the frame above the water surface are removably provided at multiple locations on a shoring frame made of steel materials, and a stepladder is erected on the top surface of the frame, and the frame is Support for constructing a floating concrete structure, comprising a suspension fitting attached to the outer peripheral frame of the body so as to be slidable in the longitudinal direction, and a steel rod for suspension can be freely attached to the suspension fitting. Device.