JP4063728B2 - Method of constructing tower using precast molded body and formwork used in this method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In particular, the present invention is a precast suitable for use in the construction of a tower body having a continuous gradient gradually decreasing in diameter upward and having a top section having a circular shape, a bottom section or a rectangular section. The present invention relates to a method for constructing a tower using a molded body and a mold used in this method.
[0002]
[Prior art]
Construction of a cylindrical structure having a gradient and a diameter changing by using cast-in-place concrete can be performed by, for example, a slip foam method. For example, a small tower structure with a small diameter for the height, such as a wind power plant, is not realistic because the profitability cannot be achieved by the on-site construction method. Therefore, it is desired that a plurality of precast (PCa, hereinafter abbreviated as PCa) compacts are formed by dividing the same into a plurality in the height direction, and these are stacked in multiple stages to form one tower.
[0003]
By the way, as a technique for molding a PCa molded body having a gradient, a mold apparatus having a drive support mechanism that expands and contracts the mold in the inner and outer directions has been developed (Patent Document 1).
[0004]
[Patent Document 1]
JP2003-33907A (P2003-33907A)
[0005]
[Problems to be solved by the invention]
However, the technique disclosed in this document is suitable for molding a PCa molded body having a constant cross-sectional shape formed in a polygonal shape. For example, the bottom cross-section is rectangular and the cross-section becomes circular as it reaches the top. In the case of making a deformed cross-sectional shape that approaches, there is a problem that the formwork piece increases due to the inappropriateness of the diameter and shape of each part.
[0006]
In the present invention, for example, in constructing a tower having a variable cross-sectional shape that has a rectangular cross section and approaches a circular cross section as it reaches the upper part, the PCa compacts having the respective diameters and cross-sectional shapes can be formed with a minimum mold. It is an object of the present invention to provide a tower building method using a PCa molded body that can be molded, and in particular, can easily and quickly construct a tower body having a variable cross-sectional shape, and a mold used in this method.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the method of the present invention is a method for constructing a tower body by connecting in the height direction a plurality of precast molded bodies obtained by dividing a tower body that gradually decreases in diameter upward. The precast molded body is molded by placing concrete in a mold that can be reduced in diameter according to the reduction ratio in the molded body of the tower to be constructed, A plurality of divided molds divided in the horizontal direction and detachable from each other, the width of the divided molds being determined from the number of divisions of the tower body and the reduced diameter ratio of the precast molded body It is characterized by being set to a width dimension or an integral multiple thereof.
[0009]
Further, the method of the present invention is a precast in which a tower having a rectangular cross section having a circular shape in the top portion and a square portion in the bottom portion having the same radius as the radius of the circular portion is equally divided into a plurality of heights in the height direction. A method of constructing a tower having a continuous gradient by connecting the precast molded bodies in the height direction using the molded bodies, wherein the molding mold of each of the precast molded bodies is divided into quarters. And four fixed molds having a trapezoidal conical cylinder shape and molds for forming a straight part connected between the fixed molds, and the linear part forming molds are formed in the fixed molds. A plurality of divided molds having a width difference of a difference between the diameters of the upper and lower bases or an integral multiple of the same are arranged so as to be detachable and connectable to the fixed molds. .
[0010]
On the other hand, a mold according to the present invention is a mold for forming the precast molded body, and includes a plurality of divided molds that are divided in the horizontal direction and can be detached from each other. The width dimension is set to a unit width dimension obtained from the number of divisions of the tower body and the reduced diameter ratio of the precast molded body, or an integral multiple thereof.
[0011]
Further, the mold according to the present invention is a mold for molding the precast molded article, and is formed between four fixed molds having a trapezoidal conical cylindrical shape obtained by dividing the circular portion into quarters, and each fixed mold. The linear part forming mold is connected to form a linear part, and the linear part molding form is a difference between the diameters of the upper base and the lower base of the fixed mold, or an integral multiple thereof. A plurality of divided molds having a width as a dimension are arranged so as to be detachable and connectable to the fixed mold.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 (a) and 1 (b) show a first embodiment of a tower constructed by the construction method of the present invention, and FIGS. 2 (a) and 2 (b) show the present invention for molding the precast molded body. The formwork concerning is shown.
[0013]
In FIG. 1, a tower body 1 to which the present invention is applied is, for example, a tapered-gradient tower body having a rectangular cross section with a circular top section and a curved lower end having the same radius as the circular shape. Thus, eight PCa molded bodies 1a to 1h, which are divided into eight parts so that the gradient is continuously constant from the uppermost part to the lowest part, are stacked, and a formwork is created on the premise of this shape ( The actual tower is divided into a large number such as 30 divisions as in the example shown in FIG. 3, for example, but for convenience of explanation, an example of 8 divisions is shown here as a model).
[0014]
As shown in FIG. 2 (a), this mold has four trapezoidal conical cylinder-shaped fixed molds 3 formed by dividing a circular portion of the uppermost horizontal section into quarters in the horizontal direction, and a fixed shape. It consists of a plurality of divided molds 4 for forming a horizontal section straight line portion between the molds 3, and the fixed mold 3 can be shared according to each cross section.
[0015]
Although only the outer formwork is shown in the figure, the inner formwork which is similar to this and is formed with an outer dimension according to the thickness of the precast tower 1 has a predetermined interval. It is opposed to the outer mold (not shown). Moreover, although the uppermost horizontal cross section is circular, it is needless to say that not only a perfect circle but also a substantially circular shape is included. For example, in FIG. 2, the divided form 4 has the same upper and lower width dimensions, but it can also have a triangular shape or a trapezoidal shape that shrinks upward. In this case, the uppermost horizontal section is Needless to say, the present invention can be applied to such a case although it is not a perfect circle.
[0016]
Furthermore, the fixed molds 3, the fixed mold 3, the divided mold 4, and the detaching mechanism between the divided molds 4 are not shown, but the flanges are raised from the respective edges toward the outside to face each other. A well-known coupling means such as passing a bolt through a flange and screwing a nut can be employed. As a result, the outer mold has an inner surface as a mold surface and the outer surface is detachably connected by an appropriate detachable mechanism, and the inner mold has an outer surface as a mold surface and is detachably connected at an inner side by an appropriate detachable mechanism. The
[0017]
In the above configuration, for example, in order to mold the PCa molded body 1a arranged at the top, the fixed molds 3 are connected to each other, and concrete is placed between the outer mold frame and the inner mold frame, thereby obtaining a predetermined meat. A trapezoidal cone-shaped PCa molded body 1a having a predetermined thickness and thickness can be formed.
[0018]
Each of the divided molds 4 has a linear strip shape having a width corresponding to the difference between the diameters of the upper and lower bases of the fixed mold 3 as shown in FIG. 2 (b). For example, in order to mold the PCa molded body 1b immediately below the top, that is, the second-stage PCa molded body 1b, one split mold 4 is arranged between the fixed molds 3 and connected to the fixed mold 3 If the molding is performed, a second-stage PCa molded body 1b having an upper base dimension that approximates the lower-bottom dimension of the first-stage PCa molded body 1a can be obtained.
[0019]
Subsequent molding is performed by adding the divided mold 4 to the fixed mold 3 one by one for each molding on the lower side, thereby increasing the width dimension of the linear portion and substantially continuously forming the PCa molded body with a predetermined gradient. 1c-1h will be obtained.
[0020]
In the present embodiment, the width dimension of the divided mold 4 is constant as the diameter dimension difference between the upper base and the lower base in the fixed mold 3, but it is also possible to mix integer multiples thereof. For example, when the number of divisions in the height direction of the tower is n, the bottom PCa molded body requires a maximum of (n-1) division molds 4 on one side, but the number of divisions is large. And when molding in order from the bottom, when molding the next height, the number of reduction is one on each side, a total of four, because there are four divided molds for each molding, There is a lot of waste.
[0021]
Therefore, it is also possible to prepare division molds with integral multiple dimensions, and to effectively divert the division mold by changing the combination for each reduction (when molding from the bottom side) or every increase (when molding from the top side). Can do. Also, the minimum unit width is 1 time, 2 times, 4 times, 8 times. . . By preparing each divided mold 4 set in the above, an arbitrary positive multiple width can be formed by the combination, and the number of divided molds to be prepared is reduced and the assembling man-hours are reduced. This can also reduce the construction period.
[0022]
FIG. 3 shows a second embodiment in which the method of the present invention is applied to a tower of wind power generation. The height is 60 m, the top diameter is 3.5 m, the circular cross section has a wall thickness of 20 cm, and the bottom diameter is 4. This is an example of about 30 PCa compacts that are divided into about 30 parts in the height direction, and about 30 PCa compacts are formed. (B) shows the tower body 10 formed by stacking the obtained PCa compacts.
[0023]
Among the molds, 12 is a quarter-cylindrical fixed mold, and 14 is a plurality of divided molds joined to the fixed mold 12.
[0024]
Since the dimensional difference between the upper and lower bases of the PCa molded body constituting the top portion of such a molded body is minimal as compared with the model shown in FIGS. 1 and 2, the method of the present invention was applied. In some cases, smoother continuity can be obtained.
[0025]
【The invention's effect】
As is clear from the above description, the method for constructing a tower using the PCa molded body according to the present invention and the mold used in this method are capable of molding PCa of different diameters and shapes with a minimum mold. The body can be molded easily and quickly, and the tower can be easily and quickly constructed by using the PCa molded body.
[Brief description of the drawings]
1A is a plan view, a side view, and a bottom view of a tower constructed using a PCa molded body to which the method according to the first embodiment of the present invention is applied, and FIG. 1B is each PCa molded body. FIG.
FIG. 2A is a side view showing a combination of forming molds for the tower body, and FIG. 2B is a perspective view and an exploded perspective view thereof.
FIG. 3A is a side view showing a combination example of molds according to the second embodiment showing the case where the present invention is applied to a tower of a wind power generator, and FIG. 3B shows a completed state of the tower. It is a perspective view shown.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,10 Tower 1a-1h PCa molded object 3,12 Fixed formwork 4,14 Division | segmentation formwork 30 Outer formwork 31 Inner formwork

Claims (4)

A method of constructing a tower body by connecting a plurality of precast molded bodies obtained by dividing a tower body that gradually decreases in diameter toward the upper direction in the height direction,
The precast molded body is molded by placing concrete in a mold that can be reduced in diameter according to the reduced diameter ratio of the tower to be constructed, and the mold is divided in the horizontal direction. And has a plurality of divided molds that can be attached to and detached from each other ,
A precast molded body characterized in that a width dimension of the divided mold is set to a unit width dimension or an integral multiple thereof determined from the number of divisions of the tower body and the reduced diameter ratio of the precast molded body. How to build a tower. A precast molded body obtained by dividing a tower having a rectangular cross section having a circular cross section at the top and a quarter circle having the same radius as the radius of the circular portion at the bottom portion into a plurality of equal parts in the height direction is used. A method of constructing a tower having a continuous gradient by connecting the molded bodies in the height direction,
The molds for molding each precast molded body are composed of four trapezoidal conical cylinder-shaped fixed molds obtained by dividing the circular part into quarters, and molds connected between the fixed molds to form straight portions. It is
The linear part forming mold is capable of mutually attaching and detaching a plurality of divided molds each having a width of a difference between the diameters of the upper and lower bases of the fixed mold or an integral multiple of the same. A method for constructing a tower using a precast molded article, wherein the towers are arranged so as to be connectable to each other. A mold for molding a precast molded article used in the construction method according to claim 1 ,
A plurality of divided molds divided in the horizontal direction and detachable from each other, and the width of the divided mold is determined from the number of divisions of the tower and the reduced diameter ratio of the precast molded article A formwork characterized by being set to a width dimension or an integral multiple thereof. A mold for molding a precast molded article used in the construction method according to claim 2 ,
It consists of four fixed molds of trapezoidal conical cylinders obtained by dividing the circular part into quarters, and a linear part forming mold for forming a linear part connected between the fixed molds,
The linear part molding mold is capable of mutually detaching a plurality of divided molds having a width of a difference between the diameters of the upper and lower bases of the fixed mold or an integral multiple of the same, and the fixed mold A formwork characterized by being arranged so as to be connectable to each other.

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