JPH0235105B2 - KONKURIITOKOZOTAIDASETSUYOKATSUDOKATAWAKUSOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to a sliding formwork device for pouring concrete structures.

<<Prior Art>> Conventionally, the sliding form construction method, which uses a sliding formwork device for pouring concrete, has been applied to the construction of silos, piers, caissons, chimneys, wells, tank side walls, and the like.

In this type of construction method, a pair of inner and outer formwork plates are supported by a gate-shaped yoke body, and a climbing jack fixed to the yoke body climbs along an upright rod buried in the concrete structure. The frame plate is raised and at the same time concrete is poured to construct the concrete structure.

However, such construction methods have the following technical problems.

≪Problem to be solved by the invention≫ In other words, in the above-mentioned construction method, the concrete poured between the inner and outer formwork plates has low initial strength because the internal water is trapped, and the concrete cannot withstand its own weight. There were problems such as the time it took to raise the formwork plates and the inability to obtain a strong and homogeneous concrete structure.

The present invention has been made in view of these problems, and aims to speed up the work cycle by promoting the early dehydration of retained water in the concrete poured between the inner and outer formwork plates, and to make it denser and stronger. The purpose of the present invention is to provide a sliding formwork device that allows a homogeneous concrete structure to be obtained.

≪Means for Solving the Problems≫ In order to achieve the above object, the present invention includes a pair of vertical members and horizontal members, which are installed at intervals in the circumferential direction so as to sandwich the concrete structure to be constructed. It is installed on multiple gate-shaped yoke bodies, a pair of formwork plates that are supported by the vertical members of these yoke bodies, and face each other at a predetermined distance, and concrete poured between these formwork plates. a pressure plate, a beam installed on the lower surface side of the horizontal member of the adjacent yoke body, a jack fixedly installed between the pressure plate and the beam, and a jack embedded in the concrete structure, It is characterized by comprising an erected rod that extends upwardly through the pressure plate and the beam, and a clamping device that is installed between the erected rod and the beam to freely separate and connect the two.

<<Example>> Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a sliding formwork apparatus for pouring concrete structures according to the present invention.

The sliding formwork device shown in the figure is one in which the present invention is applied to the construction of a cylindrical concrete structure.

The sliding formwork device W has a plurality of yoke bodies 1, 1 installed at predetermined intervals in the circumferential direction so as to sandwich the concrete structure to be constructed.

Each yoke body 1 includes a horizontal member 2, an inner and outer vertical member 3,
3', and has a gate shape in which the upper ends of the inner and outer vertical members 3, 3' are connected by a horizontal member 2.

A pair of continuous inner and outer frame plates 5, 5' facing each other at a predetermined distance is supported on the inner sides of the inner and outer vertical members 3, 3', respectively, with a raised member 4 interposed therebetween.

The inner and outer formwork plates 5 and 5' are provided with drainage holes (not shown) with inner diameters for draining the internally held water of the concrete 6 that is being poured as needed, separate from the poured concrete 6. Multiple holes may be provided.

Reference numerals 7 and 7' designate workbenches that are fastened to the outsides of the inner and outer vertical members 3 and 3', respectively.

15 is a concrete pressure plate installed on the concrete 6 placed between the inner and outer formwork plates 5 and 5'.

The concrete pressure plate 15 is provided with through holes 17 at appropriate locations through which vertical reinforcing bars 16 to be embedded in the concrete structure to be constructed are inserted.

Reference numeral 8 denotes a continuous beam body, which is disposed on the lower surface side of the horizontal members 2, 2' between the adjacent yoke bodies 1, 1.

A through hole 10 is provided in the center of the beam body 8 located between the yoke bodies 1, 1, through which an upright rod 9 to be buried in the concrete structure to be constructed is inserted.

Then, the beam body 8 and the concrete pressure plate 15
A plurality of hydraulic jacks 14 are vertically installed between the two.

The tip of the telescopic piston 13 of each hydraulic jack 14 is fixed to the concrete pressure plate 15,
The rear end of the main body of the jack 14 is fixed to the lower surface side of the beam body 8.

A hydraulic clamping device 11 is installed in the through hole 10 of the beam 8 to freely separate and connect the beam 8 and the upright rod 9.

Note that the reference numeral 18 shown in FIG.
This is a through hole for inserting the vertical reinforcing bar 16 drilled in the concrete pressure plate 15, and the through hole 19 is a through hole for inserting the vertical reinforcing rod 9 drilled in the concrete pressure plate 15.

Next, the operation of the sliding formwork device W having the above configuration will be explained.

In FIG. 1, when the clamping device 11 is first driven to connect the beam 8 to the upright rod 9, the entire weight of the sliding formwork device W is supported by the upright rod 9.

In this state, when the jack 14 is driven to retract the telescopic piston 13, the concrete pressure plate 15 moves upward, and the upper part of the existing concrete 12 is separated laterally by the form plates 5 and 5', and the upper part is An open space is formed.

Then, new concrete 6 is placed in this space.

Immediately after placing the concrete 6, the jack 14 is driven to extend the telescopic piston 13, thereby bringing the concrete pressure plate 15 into contact with the upper surface of the concrete 6, and pressing the clamp connected to the upright rod 9. A reaction force is applied to the device 11, and the pressure plate 15 is further pushed down.

When the pressure plate 15 is pushed down in this way, the water retained in the concrete 6 is formed between the inner and outer formwork plates 5, 5' and the existing concrete 12.
Drainage quickly drains to the outside through the gaps.

When the retained water is discharged in this way, the poured concrete 6 is pressed uniformly throughout, and it is possible to obtain high initial strength, dense, strong, and homogeneous concrete at an early stage. become.

After this, the clamping state of the clamping device 11 that connects the upright rod 9 and the beam body 8 is released, and the two are separated.

Then, a reaction force is applied to the poured concrete 6 that has developed a predetermined initial strength through the concrete pressure plate 15, and the jack 14 is driven to drive the piston 13.
When the piston 13 is extended, the sliding formwork W including the inner and outer formwork plates 5, 5' moves upward by a length corresponding to the extension stroke of the piston 13.

Next, the clamping device 11 is driven to connect the beam body 8 and the erected rod 9, and when a reaction force is applied to the erected rod 9 and the jack 14 is driven to retract the piston 13, the poured concrete 6 A space will be created above, and concrete will be poured into this space again.

By sequentially repeating the above operations, a cylindrical concrete structure having the same diameter in the vertical direction is constructed.

In addition, in the above embodiment, the case where a circular hollow cylindrical concrete structure is constructed using the sliding formwork device W of the present invention was illustrated, but the formwork device W of the present invention has a sliding formwork device W of the present invention. Depending on the arrangement, it can also be applied to the construction of cylindrical concrete structures with other cross-sectional shapes, for example oval or polygonal.

<<Effects of the Invention>> As explained in detail above, according to the sliding formwork device according to the present invention, the concrete poured between the inner and outer formwork plates is pressed by the pressure plate, and the retained water is quickly released. is discharged, making it possible to obtain a solid, strong, and homogeneous product, and the sliding formwork device is raised by absorbing the reaction force on the poured concrete, which quickly develops its initial strength by discharging the retained water. It is possible to speed up the work cycle.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a sliding formwork device according to the present invention. W...Sliding formwork device, 1...Yoke body, 2...
Horizontal members, 3, 3'...Internal and external vertical members, 5,5'...Internal and external formwork plates, 6...Pour concrete, 7,7'...
...Workbench, 8...Beam, 9...Erection rod, 11
... Clamping device, 12 ... Existing concrete, 13
... Piston, 14 ... Jacket, 15 ... Concrete pressure plate.

Claims (1)

[Claims] 1 A plurality of gate-shaped yoke bodies are installed at intervals in the circumferential direction so as to sandwich the concrete structure to be constructed, and have a pair of vertical members and horizontal members, and are supported by the vertical members of the yoke bodies, and are installed at predetermined intervals. A pair of formwork plates facing each other with a distance between them, a pressure plate installed on the concrete placed between these formwork plates, and a beam installed on the lower surface side of the horizontal member of the adjacent yoke body. a jack fixedly installed between the pressure plate and the beam body; an upright rod embedded in the concrete structure and extending upward through the pressure plate and the beam body; A sliding formwork device for pouring concrete structures, comprising a clamping device installed between the rod and the beam body to freely separate and connect the two.