JPS5865810A - Timbering method and apparatus for constructing concrete structure on water surface - Google Patents

Abstract

PURPOSE:To easily perform a timbering work for a concrete structure on the water by a method in which a float is detachably attached to a timbering frame, the frame is floated on the water surface and fixed to a pile, the float is removed, and then concrete is placed into a formwork assembled on the frame. CONSTITUTION:When constructing a structure on the water, e.g., landing pier, etc., plural steel tubular piles 31 are erected on the sea bed, and a timbering frame 20 of an almost oblong hollow and square cylindrical steel assembly, having a float 21 on its lower part and a stepladder 25 on its upside, is towed to between the piles 31. Then, when the water level is higher than the lowest tide level L2, the frame 20 is connected hanging steel bars 32 between the upper ends of the piles 31. When, under the condition, the tide level is lowered and an aperture is formed between the float 21 and the flat face, a wire 23 is cut off to cause the float 21 to fall for recovery. After this, a formwork 41 is assembled through a proper square timber 40 on the stepladder 25, and then concrete 42 is placed and supported on the piles 31 to contruct a concrete structure on the water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shoring method and apparatus for constructing floating concrete structures such as piers or dolphins as port facilities. type shoring is proposed.

As shown in Fig. 1, this floating type shoring is constructed by assembling a longitudinal girder 1 made of a long steel pipe and a cross beam 2 that connects it 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. In order to construct the upper part of the pier using such shoring, as shown in Figure 2, the frame 3 is fixed between the piles 40 of the pier, and additional shoring 5 and formwork are placed on top of it. After constructing the frame 3, the upper concrete 7 is placed.When installing the floating type shoring, the frame 3 is floated on the sea as shown in Figure 2 (
After pulling the frame 3 between the piles 4 as shown in (a), a lifting device such as a chain block is installed to lift the frame 3 as shown in (b) of the same figure.

Conventional floating shoring like this has its own buoyancy, so if the installation position is lower than the water level at high tide, 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 water surface height due to the tide level, and the installation position of the shoring must be high. Therefore, the space between the bottom of the pier and the shoring is narrow, The work efficiency is inevitably poor because there is not enough space for the three voices above, and furthermore, to remove the shoring, it is necessary to use the same number of chain blocks and other towing machines as were used during installation. There were disadvantages such as the need to reload hanging materials from floating skin maintenance equipment onto chain blocks.

In view of the above-mentioned conventional problems, the present invention eliminates the need for a lifting device such as a chain block for hoisting the entire shoring structure using a trench to a height that is not affected by the tide level, and moreover, To provide a shoring method and device for constructing a floating concrete structure that can be installed so that buoyancy due to water level fluctuations does not affect the shoring, and that allows for a wider work space for formwork erection, etc. than in the past. The purpose is to removably attach a float that floats the frame to the bottom of the shoring frame, which cannot float by its own buoyancy.
° The frame body is floated above the water surface and towed between the piles for supporting floating concrete IJ-to structures that are erected to protrude above the water surface, and the frame body is floated above the water surface. The float is fixed to the pile using a hanging bracket attached to the frame material on the outer periphery of the frame so as to be movable in the longitudinal direction, and then the float is removed from the frame and placed on a stepladder erected on the frame. A concrete formwork is assembled by supporting the float, concrete is poured into the formwork, and after the concrete has hardened, the float is reattached to the frame body, and the float is released from the pile and floated. The present invention relates to a shoring method and device for pulling out the support 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 will be explained.

In the figure, 20 is a support frame. The frame 20 has a long frame 20a and a short frame 20b made of hollow rectangular steel and has a substantially rectangular plane, and is so heavy that it cannot float by its own buoyancy.

Floats 21 made of polystyrene foam and formed into a rectangular parallelepiped shape are attached to the frame body 20 at several locations across a plurality of short frame members 20b. This float 21 has a fixing bar 22.22 on its upper surface.
22 as two short frame members 20b.

20b K. Both ends are fixed to the short frame member 20b by using the numbered wires 23. And this float 21
A buoyant force that causes the frame body 20 to float is provided.

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 provided at regular intervals on the upper surfaces of the long frame member 20a and the short frame member 20b of the frame body 20, and the lower end openings are fitted to the protrusions 24, thereby attaching a large number of stepladders 25. has been erected. This stepladder 25 has a jack consisting of a screw shaft 21$b screwed in the axial direction to the upper end of each support column 25a, and a horizontal member 25c is fixed between the upper ends of the screw shafts 25b.

On the other hand, hanging metal fittings 26 are attached to a long frame 20a constituting the outer peripheral edge of the frame 20 at a plurality of locations. This hanging metal fitting 26 is attached to the long frame material 2 as shown in FIGS. 7 and 8.
A substantially U-shaped steel strip 27 that is wrapped around 0a and attached so as to be freely movable in the longitudinal direction, and a pair of steel rod supports 28 fixed between both ends of the strip 27. The members 28 are steel members having a U-shaped cross section and are arranged back to back to each other, and a steel rod insertion space @211 is formed between them.

Further, on the upper surface of the long frame member 20a, connecting member fasteners 3o for connecting with other adjacent frames 2° are erected at regular intervals.

Next, an embodiment of the construction method of the present invention using the above-mentioned apparatus will be explained with reference to the drawings from FIG. 9 onwards.

This is a steel pipe pile erected from the seabed. The float 21 is attached to the frame 20 described above between the piles 81, and the boat is towed with the stepladder 2IS erected on the upper surface. Then, when the water surface is higher than the normal lowest tide level, that is, at a position higher than the low water level b, the steel rod 32 for raising water is connected. For this connection, as shown in Fig. 10, a steel plate 88 is provided horizontally protruding from the upper end of the pile 31, and this plate 3s
Insert the upper end of the steel rod s2 into the hole 33a of the steel rod 3! on the plate 33. Screw in the metal rod (Nara) $4, and attach the lower end of the steel rod s2 to the above-mentioned hanging metal fitting! 6 into the steel rod insertion gap 29,
This is done by screwing a washer 35 and a nut 36 under the support member 28. As the steel rod 32 used for this purpose, for example, a deformed steel rod having protrusions arranged in a spiral arrangement along its entire length and cut to a desired length may be used, or a threaded steel rod with threads carved on both ends may be used. 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 pole 37 is inserted into the metal fitting sO on the top surface of the long frame member 20a, and a nut 38 is tightened to connect the frames 2o to each other.
A wedge 39 is driven between the pile 31 and the pile 31, and the wedge 39 is also fixed horizontally to the pile 31.

In this way, with the frame body 20 floating on the water surface, the pile 3
After fixing at 1, when the tide level decreases, the frame 20 is fixed to the steel rod
2, it becomes suspended and a gap is created between its bottom and the water surface. Therefore, cut the wire 2s and frame 2.
The float 21 is released from the water surface and dropped onto the water surface. By removing the float 21, the buoyant force that causes the frame body 20 to float above the water surface is removed, and the frame body 20 is supported by the pile s1 without floating even when the tide level rises next time. The screw shaft 25b of the stepladder 25 on the frame 20 suspended and supported in this manner
The height of 5c is adjusted, and a formwork 41 is assembled and supported on the upper surface of the frame 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. Then, the concrete poured into the formwork 41)'4!
After curing, stepladder! S, remove the formwork 41, and remove the bolt 1 that connects each frame body 20 in the horizontal direction.After that, the float 21 is pulled under the frame body 20 again in anticipation of the low tide level. Enter, number line! After reinstalling using 3, attach the steel bar 32 at the bottom position of the conch IJ-) 42.
The frame body 20 is towed to the next construction site, and the shoring is assembled in the same manner as described above.

In the above embodiment, the float 21 is
Attachment and detachment of the frame body 20 to and from the piles are carried out, but on a coast where the tides and ebb and flow are low, these operations are carried out sequentially regardless of the tide level.

The construction method and device of the present invention are constructed as described above, in which the float is removably attached to the shoring frame, the frame is fixed to the pile while floating above water, and then By removing the float,
It is no longer necessary to use equipment such as jacks to lift the frame to a height that is not affected by the tide level as in the past, the equipment itself is simplified and costs are reduced, and the frame mounting process is also easier. This method is much simpler than the one that is lifted up by a crane or the like, and at the same time the work is less dangerous. Furthermore, since the frame is not lifted up and suspended, it is possible to increase the distance between the frame and the concrete structure, and the workability of assembling and removing forms and shoring materials has been improved. be.

Furthermore, in the device of the present invention, by making the hanging metal fittings movable in the longitudinal direction with respect to the frame, it is easy to align the hanging connection positions even if, for example, the driving position of the pile is slightly different from the designed position. The ninth aspect is that a suitable hanging condition can be easily obtained.

[Brief explanation of the drawing]

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 line 1-I in FIG. 3, FIG. 5 is a sectional view taken along line I-I in FIG. 7, and FIG. The figure is a front view showing the construction state of the construction method of the present invention, and FIG. 10 is a sectional view of the state of connection by steel rods. 20... Frame for shoring, 20a... Long frame material, 20b
...Short frame; L21...Float, '1to...Stepladder,
26... Hanging fittings, 31... Steel pipe piles, 32... Steel rods for hanging. Patent applicant: Pentayo Construction Co., Ltd.

Claims (2)

[Claims] (1) A float that floats the shoring frame, which cannot float by its own buoyancy, is removably attached to the bottom of the frame, and is used to support floating concrete structures that are erected and protrude above the water surface. The frame is floated above the water surface and towed between the piles, and the hanging bracket is attached to the frame member on the outer periphery of the frame so as to be movable in the longitudinal direction while the frame floats above the water surface. Then, the float is removed from the frame and supported on a stepladder set up on the frame to assemble a concrete form, concrete is poured into the form, and concrete is poured into the form. Shoring for constructing a floating concrete structure, characterized in that after the concrete hardens, the float is reattached to the frame, released from the fixation to the pile, floated, and pulled out between the piles. Method. (2) A shoring frame constructed of steel materials is provided with removable floats for floating the frame above the water surface at multiple locations, and a stepladder is erected on the upper surface of the frame, and For the construction of a floating concrete structure, which is equipped with a suspension fitting that is slidably attached to the outer peripheral frame of a frame body in the longitudinal direction, and a steel rod for suspension can be freely attached to the suspension fitting. shoring equipment.