JPS6337226B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a formwork apparatus for constructing a tower-like structure, such as a bridge pier or a core part of a building, which is made of concrete and has a relatively high height and a small cross section.

Conventionally, constructing a small-diameter tower-like structure required large-scale construction work, such as installing scaffolding all over the inside and outside of the tower-like structure, and lifting and setting the formwork as a large panel using a lifting machine. . Additionally, cranes must be installed to lift reinforcing bars, concrete, and temporary materials, and the operating rate of the lifting equipment is therefore too high, making the work complicated. For this reason, methods such as the sliding formwork method and the climbing method have been used, but the former poses problems in labor management due to the continuous sliding of the formwork, while the latter involves supporting the formwork from the existing structure itself. There were problems such as the need for a complicated lifting mechanism to climb the frame.

This invention was made based on the above-mentioned circumstances, and consists of installing a tower crane mast inside a small-diameter tower-like body, and supporting a screw rod by a holding fitting detachably attached to the mast. A gantry is provided that can be raised and lowered via a rotating shaft fitting screwed to this screw rod, and this gantry is used to glue the formwork with internal scaffolding so that it can be raised with each concrete pouring lift. ,
The formwork with external scaffolding is configured so that it can be lifted and set by a crane, increasing the operating efficiency of tower cranes in the construction of small-diameter tower-like bodies, enabling safe and smooth construction, and making it possible to lift and set the formwork on the internal formwork. The present invention provides a formwork device used for constructing small-diameter tower-like bodies, which simplifies the lifting mechanism and allows the crane to be downsized.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the construction method of the present invention, FIG. 2 is an enlarged view of the main part thereof, and FIG. 3 is a cross-sectional view showing the main part of FIG. 1. In the figure, A is a tower-like body whose cross section is quadrilateral and narrows upward, taking a bridge pier as an example, and is composed of an outer shell wall with a hollow interior. 1 is a tower crane mast, which is fixed to the center bottom of the small-diameter tower A to be constructed with an anchor bolt, etc., and the crane 1 is attached to the upper end.
A is installed. Reference numeral 2 denotes holding metal fittings installed on the four sides of the tower crane mast 1, two on each of the four sides of the mast 1, which are removably attached to the pillars, and three holding metal fittings are provided at predetermined intervals in the vertical direction. It will be done. This holding fitting 2 removably inserts a screw rod 3 into a protrusion from the mast 1 and holds it rotatably. The screw rods 3 are used by being connected at intervals of the holding fittings 2, and are rotated by being equipped with a driving device M supported by the mast 1 at the top.

A rotary shaft fitting 4 is screwed into the screw rod rod 3, and each rod 3 is positioned above the lower and middle holding fittings 2, respectively.
The rotary shaft fitting 4 has a vertical screw internal therein which engages with the screw rod 3, and can be screwed upward and downward by the rotation of the screw rod 3. The base ends of the upper and lower horizontal members 5a of the horizontal stand 5 are fixed to the upper and lower rotating shaft fittings 4a and 4b. The gantry 5 is constructed as a frame made of steel, and the distal end of the horizontal member 5a is constructed as a slide member 5b which can be expanded and fixed, and the fixed length portion is reinforced with an intermediate member 5c and a brace 5d. Reference numeral 6 denotes an internal formwork that is supported at its outer tip by the gantry 5, and is provided at the tip of the gantry 5 as usual by means of a raised material 6a and a vertical butterfly material 6b provided on the back side of the formwork. Supported. Reference numeral 7 denotes a flint material that connects the fixed length portion of the gantry 5 and the vertical butterfly material 6b on the outside of the internal formwork 6, and this flint material 7 is also configured to be expandable and contractible in the same way as the slide member 5b. . The inner corner portions of the adjacent internal formworks 6 can be bent. Reference numeral 8 denotes an internal scaffold that is suspended below the gantry 5 from a fixed length portion of the gantry 5.

On the other hand, on the outside of the tower-like body A, an external formwork 9 is fixed to a vertical butterfly material 9b via a raised material 9a, and an external suspension 10 is attached thereto.

Further, 11 is a horizontal beam member for suppressing buckling of the tower crane mast 1, and is appropriately installed between the concrete wall of the tower-like body A and the tower crane mast 1. In addition, the tower-shaped body A is attached to the internal suspension foot 8 of the internal formwork 4 and the external suspension foot 10 of the external formwork 9.
Guide rollers 12a and 12b are attached to slide along the concrete wall surface of the concrete wall.

In the tower crane mast 1 configured as described above, when the screw rod 3 is rotated, the rotating shaft fitting 4 screwed onto the screw rod 3 is rotated.
a, 4b rises, and the gantry 5 and internal formwork 6, which are integrally constructed therewith, rise. Further, the external formwork 9 is raised by a crane 1a attached to the tower crane mast 1.

Hereinafter, a method for constructing a small diameter tower A according to the present invention will be explained with reference to FIGS. 4 to 8.

FIG. 4 shows a state in which a small-diameter tower-like body A has been constructed to a predetermined height, and the inner formwork 6 and the outer formwork 9 are set and concrete is poured. When the concrete hardens here, the slide member 5b of the gantry 5 is contracted, the internal formwork 6 is released, the screw rod 3 is rotated, and the gantry 5 is raised to a predetermined height as shown in FIG. let
Here, the tower-like body A has an upwardly narrowed shape,
By reducing the gantry 5 and positioning the internal formwork 6 inside the periphery of the upper end opening of the concrete pouring part, the upper part of the internal formwork 6 can pass through the upper opening of the concrete pouring part. Since the gantry 5 can be reduced in size in this way, even if the tower-like body A is narrowed at the top, the internal forms 6 can be sequentially rearranged and moved upward.

Next, when the slide member 5b is extended and the internal formwork 6 is set in a predetermined position, the anchor support fixing the external formwork 9 to the existing concrete part below the external formwork 9 is released, and the As shown in Figure 6, the external formwork 9 is hoisted up by the crane 1a,
As shown in FIG. 7, it is raised and set at a predetermined position corresponding to the internal formwork 4, and its lower part is anchored again to the poured concrete.

Therefore, in order to prepare the screw rod 3 attached to the tower crane mast 1 for the next process,
Rearrange just one layer. That is, first, the lowermost holding fitting 2 is removed while the other two are supporting the load, and then the lowermost section of the screw rod 3 is cut off, moved upward and attached to the top, and the drive device M is removed. If they are raised along the mast and fixed respectively,
The screw rod 3 is raised substantially by one step. Thereafter, the other holding fittings 2, 2 are sequentially moved below the rotating shaft fittings 4a, 4b, and the mold setting is completed. Furthermore, since the movement of the screw rod 3 can be completed by replacing the holding fitting 2 and adding the screw rod 3 to the replaced holding fitting 2, the screw rod 3 can be easily replaced. Can be done. Further, since the vertical position of the internal mold 6 can be adjusted by the rotating shaft fittings 4a and 4b that move along the screw rod 3, the vertical position of the internal mold 6 can be adjusted extremely accurately. Furthermore, the load acting on the elevating mechanism part of the internal formwork 6 consisting of the holding fitting 2, the screw rod 3, and the rotating shaft fittings 4a and 4b is the load of the internal formwork 6, and the load of the external formwork 9 is applied to the crane 1a. Since the load is applied, the mechanism for lifting and lowering the internal formwork 6 can be simplified and the crane 1a can be made smaller compared to a device that lifts and lowers the inner and outer formwork all at once using one mechanism. By raising and lowering the internal formwork 6 and the external formwork 9 using separate mechanisms, the capacity of the lifting mechanism of the internal formwork 6, which is mainly composed of the screw rod 3, and the crane 1a for lifting and lowering the external formwork can be increased. As a result, each device operates smoothly, improving work safety.

Then, returning to FIG. 4, concrete is poured, and once the poured concrete hardens, the tower-like body A is constructed by repeating the steps shown in FIG. 5 and subsequent steps in sequence.

In addition, at this time, it is a heavy burden to release all the internal formwork 6 and apply the full load to the tower crane mast 1, so the mold is released and raised by one unit divided into four or two units facing each other. That's what I do. Furthermore, as the formwork set rises, if the horizontal beam 11 is held between the concrete wall of the tower A and the tower crane mast 1 to prevent buckling of the tower crane mast 1, the height can be increased to a certain extent. can do.

As explained in detail above, according to the present invention, a tower crane is erected inside the tower-like body, the internal formwork supported by the crane is raised by the rotation of the screw rod, and the external formwork is lifted up by the rotation of the screw rod. Since a crane is used only for lifting the formwork, there is no need for a complicated mechanism to lift the formwork when constructing this type of structure.
Tower cranes are highly efficient and can perform construction safely and smoothly. In addition, the load of the internal formwork acts on the lifting mechanism of the internal formwork, which consists of the holding metal fittings, screw rods, and rotating shaft metal fittings, and the load of the external formwork acts on the crane, so the internal and external formwork Compared to a device that lifts and lowers the internal formwork all at once using one mechanism, this has the effect of simplifying the lifting and lowering mechanism for the internal formwork and making the crane more compact. and,
By raising and lowering the internal formwork and external formwork using separate mechanisms, there is a margin in the capacity of the internal formwork and the lifting mechanism mainly consisting of screw rods, and the crane capacity for lifting and lowering the external formwork. operation becomes smoother, improving work safety. Furthermore, since the internal mold is raised and lowered by the rotary shaft fitting that moves along the screw rod, it is possible to finely adjust the vertical movement of the internal mold, resulting in extremely accurate positioning. In addition, because the pedestal, which can be raised and lowered by the screw rod, can be expanded and fixed to the outer shell wall of the tower-shaped body, when constructing a tower-shaped body with an upper narrowing, it is possible to The inner formwork is reduced in size so that the upper part of the inner formwork can pass through the upper opening of the outer shell frame body, and then the inner frame body is raised by passing through the upper opening of the outer shell frame body and can be reassembled.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG.
A cross-sectional view showing the main part of the figure, and FIGS. 4 to 8 are process diagrams showing a construction method using the apparatus of the present invention. 1... Tower crane mast, 1a... Crane, 2... Holding metal fittings, 3... Screw rod,
4... Rotating shaft fitting, 5... Gantry, 6... Internal formwork, 9... External formwork, A... Tower-shaped body.

Claims (1)

[Scope of Claims] 1. A formwork device for constructing a hollow outer shell wall of a concrete tower body with a small diameter, comprising: a tower crane installed in the center of the outer shell wall; Three upper and lower holding fittings are provided on the circumferential surface of the mast so as to be detachably attached to the mast pillar material, a screw rod is inserted into the holding fittings and held rotatably, and two upper and lower screw rods are screwed onto the screw rod. A frame structure having a stage rotating shaft fitting, a base end of which rotatably holds the rotating shaft fitting, a distal end thereof extendable and fixed to the outer shell wall, and an internal scaffold integrally provided below. an internal formwork for forming the outer shell wall that is supported at the tip of the gantry via shoring; and an external formwork that is lifted by the tower crane and supported by an existing concrete section. A formwork device for constructing a small-diameter tower-like body consisting of a formwork.