JP4401985B2 - Hollow tower construction method and hollow tower construction formwork - Google Patents

Description

  The present invention relates to a hollow tower construction method and a hollow tower construction form for constructing a concrete tower having a cylindrical shape whose diameter changes as it goes upward.

  A concrete tower constructed in a tubular shape and having a diameter reduced as it goes upward is used in various directions today. In particular, wind power generation has become popular in recent years, and it has come to be used as a tower for mounting wind turbines for wind power generation.

  This concrete tower is constructed as follows. That is, a cylindrical first outer mold frame whose upper diameter is smaller than the lower diameter and has a unit height is provided, and a cylindrical first mold whose upper diameter is smaller than the lower diameter is provided inside the outer mold frame. A cylindrical first concrete structure in which the upper diameter is reduced from the lower diameter is constructed by arranging the inner molds and placing concrete between them. Next, a second outer mold having a lower diameter that is the outer diameter of the upper end of the first concrete structure and an upper diameter that is smaller than the lower diameter is provided at the upper end of the first concrete structure, Inside the second outer mold frame is provided a second inner mold frame whose lower diameter is the inner diameter of the upper end of the first concrete structure and whose upper diameter is smaller than the lower diameter. The second concrete structure is connected to the upper end of the first concrete structure by placing concrete. Then, by repeating this, a concrete tower that is cylindrical and has a diameter reduced as it goes upward is constructed.

  However, in such a concrete tower construction method, an outer mold frame and an inner mold frame having different sizes for each of the first, second, third,. There is a problem that the construction cost increases.

  The present invention has been made to solve such a problem, and it is possible to construct a concrete hollow tower that can significantly reduce the construction cost of a concrete tower constructed in a cylindrical shape and having a diameter reduced in the upward direction. The object is to provide a method and a formwork for hollow tower construction.

In order to solve the above problems, the present invention provides a hollow tower construction method for constructing a hollow tower while stacking cylindrical structures one by one, and an outer mold for constructing the cylindrical structure with concrete and an inner form Prepare a plurality of segments as the structural unit of the mold, and configure the outer mold and the inner mold with a plurality of the segments arranged in the circumferential direction, and overlap each other in the circumferential direction of each segment. After adjusting the diameter reduction change toward the outer mold frame and the inner mold frame by changing the lap allowance of the part that has been made, concrete is placed between the outer mold frame and the inner mold frame A step of constructing the first cylindrical structure on the foundation, constructing a scaffolding at the upper end of the first cylindrical structure, and a lower diameter of the first cylindrical structure. An outer mold frame having an outer diameter at the upper end and a lower diameter of the first mold An inner mold formed on the inner diameter of the cylindrical structure is constructed on the first cylindrical structure from the plurality of segments in the same manner as in the step, and between the outer mold and the inner mold. A step of placing concrete and connecting a second cylindrical structure to the upper end of the first cylindrical structure; and a third cylindrical shape on the second cylindrical structure. A cylindrical structure formed by placing concrete while sequentially reducing the diameter of a pair of outer and inner mold frames, such as a fourth cylindrical structure on the third cylindrical structure. A process of repeating construction of a structure,
It is characterized by constructing a tower whose diameter is reduced in the upward direction.

In addition, the present invention provides a formwork used as an inner formwork or an outer formwork for placing the tubular structure with concrete in the construction of a hollow tower for constructing a hollow tower while stacking the tubular structure one by one. Then, while arranging a plurality of segments as a constituent unit of the outer mold frame or the inner mold frame in the circumferential direction, to form a cylindrical frame body by overlapping both ends in the circumferential direction of each segment, Each of the segments includes an adjustment frame that adjusts a change in diameter reduction toward the top of the frame by changing a lap margin of the overlapped portion, and a curvature changing unit that changes the curvature of each segment. It is characterized by that.

  Therefore, it is not necessary to prepare a large number of outer molds and inner molds having different diameters, and the construction can be performed with a set of molds, so that the construction cost can be greatly reduced.

Further, in the present invention, the central portion in the circumferential direction of the segment is fixed at the central portion of the frame, the both end portions in the circumferential direction of the segment are held by adjusting means provided at both end portions of the frame, by projecting or attract adjusting means and changing the curvature of its in the segment unit.

  Therefore, the diameter of the mold can be easily changed, and therefore workability can be greatly improved.

  Furthermore, in the present invention, a wire is wound around the outer periphery of the outer mold frame, and the wound pressure applied to the outer mold frame is supported by tightening the wound wire.

  Therefore, there is no need to provide reinforcing ribs or the like to improve the rigidity of the mold, and the mold can be configured with a simple structure, and therefore the cost of the mold can be reduced.

  In the present invention, the cylindrical outer mold frame and the inner mold frame are constituted by a plurality of segments separated in the circumferential direction, and both ends in the circumferential direction of this segment are formed in a cylindrical shape overlapping each other. In addition, the diameters of the outer mold frame and the inner mold frame are adjusted at the overlapping portion. Therefore, it is possible to construct the concrete tower from the base to the upper end with a set of outer and inner molds, without the need to prepare many outer and inner molds with different diameters. Cost can be greatly reduced.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows a concrete hollow tower adapted to shrink in diameter toward the top. The concrete hollow tower 1 is constructed by stacking a concrete concrete structure having a height of about 5 m on the foundation 3 in the order of the first lot 5, the second lot 7, the third lot 9,. Building towers.

  2A to 2I specifically show the process of constructing the second lot 7 on the first lot 5 in this construction method.

  First, as shown in FIG. 2A, the inner frame scaffold 11, the inner frame fixing ring 13, and the outer frame scaffold 15 are attached to the upper end portion of the concrete structure of the first lot 5.

  Next, as shown in FIG. 2B, the inner mold frame 17 assembled in advance is set on the inner frame fixing ring 13 and the reinforcing bar 19 is installed on the first lot 5.

  Next, as shown in FIG. 2C, the work scaffold 21 is fixed to the inner frame scaffold 11 and the outer frame 23 assembled in advance is suspended and set, and as shown in FIG. Set.

  Then, as shown in FIG. 2E, concrete is placed between the set outer frame 23 and inner frame 17 to construct the concrete structure of the second lot 7.

  Thereafter, as shown in FIG. 2F, the inner frame fixing ring 13, the inner frame 17, and the work scaffold 21 are removed, and the next inner frame scaffold 27 is set.

  Next, as shown in FIG. 2G, the outer frame 23 is removed, and the outer frame scaffold lifting beam 29 is set.

  Next, as shown in FIG. 2H, the outer frame scaffold 15 is lifted by a crane.

  Then, as shown in FIG. 2I, the outer frame scaffold 15 is set on the upper end portion of the second lot 7.

  Hereinafter, the entire hollow tower 1 is constructed by repeating FIGS. 2A to 2I.

  The outer formwork, inner formwork, scaffolding, etc. used in such a construction method will be described with reference to FIGS.

  In FIG. 3, the inner frame scaffold 11, the inner frame fixing ring 13, and the outer frame scaffold 15 are attached to the upper end of the concrete structure of the first lot 5, and the inner frame 17 and the outer frame scaffold 15 are attached to the inner frame fixing ring 13. The state where the outer mold 23 is set is shown. A work scaffold 21 is placed on the inner scaffold 11, and an outer fixed frame 31 and an outer slide bracket 33 are provided on the outer frame scaffold 15, as shown in FIG. A slide scaffold 35 is attached. As shown in FIG. 4, the outer slide scaffold 35 can be expanded by sliding according to the outer diameter of the concrete structure.

  In addition, the outer mold frame 23 is set on the outer frame scaffold 15 via a mold adjustment jack 37. As shown in FIG. 7, the outer mold frame 23 includes a plurality of segments 39,... Divided in the circumferential direction, and adjustment frames 39a are provided at both ends in the circumferential direction. The adjustment frame 39a is overlapped to form the cylindrical outer mold frame 23. Further, on the outer periphery of the segment 39, vertical ribs 39b are provided in the vertical direction so as to support the driving pressure. Such an outer mold 23 can be changed in overall diameter by changing the lapping margin L of the adjustment frame 39a. The inner mold frame 17 has the same structure, and the diameter of the inner mold frame 17 can be changed by changing the lapping margin L. Therefore, by changing the diameters of one set of the outer mold 23 and the inner mold 17, all the lots of the hollow tower 1 whose diameter is reduced as it goes upward can be performed, and the cost of the mold is reduced. It can be greatly reduced.

  Further, a curvature changing frame 41 as shown in FIG. The curvature change frame 41 includes a fixing bolt 43 that fixes the center of the curvature change frame and the center of the segment 39, and a push bolt 45 that connects both ends of the curvature change frame 41 and both ends of the segment 39. Is provided. The curvature of the segment 39 can be changed by pressing both ends of the segment 39 with the push bolt 45. In this manner, by changing the curvature of the segment 39, the diameter of the outer mold 23 formed by the plurality of segments 39 can be changed. Further, as shown in FIG. 8, the segment 47 of the inner mold 17 also has a curvature changing frame 49 as in the outer mold 23, and the central portion of the curvature changing frame 49 and the central portion of the segment 39 are fixed. The fixing bolt 51 is provided, and pulling bolts 53 are provided to connect both ends of the curvature change frame 49 and both ends of the segment 47.

Then, by adjusting the pull bolt 53, the curvature of the segment 47 is changed, and the diameter of the inner mold 23 is changed.

  9 to 11 show a formwork fastening device 61 that supports the side pressure when placing concrete. As shown in FIG. 9, the mold fastening device 61 has wire fixing members 63 at three positions on the outer periphery of the outer mold 23, and fastening wires 65 are interposed between the three wire fixing members 63. Is wound with tension. The wire fixing member 63 has a wire fixing portion 67 as shown in FIG. 10, and one end of the fastening wire 65 is fixed to the wire fixing member 63 with a wedge 69. The wire fixing member 63 has a wire pulling portion 71 as shown in FIG. A bolt portion 73 fixed to the other end of the wire is inserted into the wire tension portion 71, and a nut 75 that is screwed into the bolt portion 73 engages with the wire fixing member 63 via a thrust bearing 77. ing. In such a configuration, three fastening wires 65, 65, 65 are stretched between the three wire fixing members 63, 63, 63, one end is fixed to the wire fixing portion 67, and the other end is attached to the wire tension portion 71. To do. Then, by rotating the nut 75 of the wire pulling portion 71, each fastening wire 65 is tensioned and the outer mold 23 is fastened.

  In order to support the lateral pressure at the time of placing concrete, the section modulus of the outer mold 23 may be increased, but the mold itself becomes larger and heavier. Moreover, although a formwork can also be supported by a separator, it takes much time to set the separator, and the work efficiency is lowered. On the other hand, as in the above-described formwork fastening device 61, by tightening the formwork with a wire or a PC steel wire, the entire formwork can be reduced in weight and work efficiency can be improved.

  12 to 15 show another embodiment for supporting the side pressure when placing concrete. In FIG. 12, reference numeral 91 indicates a plurality of outer molds arranged in the circumferential direction, and a connecting member 93 is interposed between the plurality of outer molds 91. The outer mold 91 and the connecting member 93 are connected by a mold set bolt 95 to form an outer frame 97 as a whole. The diameter of the entire outer frame 97 can be changed by changing the nut position of the mold set bolt 95.

  On the other hand, reference numeral 99 indicates a plurality of inner molds arranged in the circumferential direction, and a connecting member 101 is interposed between the plurality of inner molds 99. The inner mold 99 and the connecting member 101 are connected by a mold set bolt 103 to form an inner frame 105 as a whole. The diameter of the entire inner frame 105 can be changed by changing the nut position of the mold set bolt 103.

  In such a configuration, a mold fastening device 107 is provided in one of the plurality of outer molds 91. The mold fastening device 107 includes a wire rope 109 wound around the outer periphery of the outer frame 97, a wire socket 111 that fixes one end of the wire rope 109, and a socket that fixes the wire socket 111 to the outer mold 91. A holding unit 112, a pulling device 113 that pulls the other end of the fixed wire rope 109, and a pulling device holding unit 114 that fixes the pulling device 113 to the outer mold 91 are provided. The traction device 113 includes a screw end 115 to which the other end of the wire rope 109 is connected, and a nut 117 with a thrust bearing that is screwed into the screw end 115.

  In such a configuration, the outer frame 97 is tightened by pulling the screw end 115 by rotating the nut 117 of the traction device 113 and tightening the entire outer frame 97 with the wire rope 109.

  As described above, in the formwork fastening device 107, the outer frame 97 is wound by the single wire rope 109, so that the rope can be easily wound. Further, the rope can be pulled only by rotating the nut 117, and the work efficiency can be improved.

  On the other hand, the inner frame fixing ring 13 is provided with a taper ring 81 as shown in FIG. Further, a tapered portion 17 a that fits into the tapered ring 81 is formed at the lower end portion of the inner mold 17. Then, by fitting the tapered portion 17a of the inner mold frame 17 to the taper ring 81, the diameter and lower end of the inner mold frame 17 can be accurately positioned. This is because the tower to be constructed has a conical shape and the diameter of each lot changes, so accurate positioning is required.

  Thus, in the construction method of this hollow tower, the cylindrical outer mold 23 and the inner mold 17 are constituted by a plurality of segments 39, 47 separated in the circumferential direction, and the segments 39, 47 The bases of towers with different diameters are formed by a pair of outer and inner molds by adjusting the diameters of the outer and inner molds. Since it is constructed from the top to the top, there is no need to prepare a large number of outer molds and inner molds with different diameters. Therefore, the construction cost can be greatly reduced.

  In the construction method of the hollow tower, the central portions of the segments 39 and 47 in the center of the curvature change frames 41 and 49 are fixed by the fixing bolts 43 and 51, and the curvature change frames 41 and 49 are fixed. Both ends of the segments 39 and 47 in the circumferential direction are held by the push bolts 45 and pull bolts 53 provided at both ends, and the push bolt 45 and the pull bolt 53 are projected or pulled, thereby causing the segments 39 and 47 in the circumferential direction. Since the curvature is changed, the diameters of the outer mold 23 and the inner mold 17 as a whole can be easily changed, so that the workability can be greatly improved.

  Furthermore, the wire 65 is wound around the outer periphery of the outer mold 23 and the wound wire 65 is tightened by the wire fixing member 63 so as to support the placing pressure applied to the outer mold 23. It is not necessary to improve the rigidity of the mold by providing ribs or the like, and the mold can be configured with a simple structure. Therefore, the cost of the mold can be reduced.

  In the above embodiment, the method of constructing the hollow tower that reduces the diameter from the base portion toward the upper end has been described. You may apply this invention to the construction method of the hollow tower which has.

The figure which shows the hollow tower to which this invention is applied. The figure which shows step by step the method used as the premise of the construction method of the hollow tower of this invention. The figure which shows step by step the method used as the premise of the construction method of the hollow tower of this invention. The figure which shows step by step the method used as the premise of the construction method of the hollow tower of this invention. The figure which shows step by step the method used as the premise of the construction method of the hollow tower of this invention. The figure which shows step by step the method used as the premise of the construction method of the hollow tower of this invention. The figure which shows step by step the method used as the premise of the construction method of the hollow tower of this invention. The figure which shows step by step the method used as the premise of the construction method of the hollow tower of this invention. The figure which shows step by step the method used as the premise of the construction method of the hollow tower of this invention. The figure which shows step by step the method used as the premise of the construction method of the hollow tower of this invention. The front view which shows the apparatus used for the construction method of the hollow tower of this invention. The top view which shows the apparatus used for the construction method of the hollow tower of this invention. The front view which shows the principal part of the apparatus used for the construction method of the hollow tower of this invention shown in FIG. The enlarged view of the part shown by VI of the apparatus shown in FIG. The perspective view which shows the principal part of the outer form frame used for the construction method of the concrete hollow tower of this invention. The figure which shows the curvature change flame | frame used for the construction method of the hollow tower of this invention. The schematic plan view which shows the mold fastening apparatus used for the construction method of the hollow tower of this invention. Sectional drawing which shows the wire fixing part of the mold fastening apparatus shown in FIG. Sectional drawing which shows the wire tension | pulling part of the mold fastening apparatus shown in FIG. Sectional drawing which shows the other example of an outer formwork, an inner formwork, and a formwork fastening device. The enlarged view of the part shown with the code | symbol 120 in FIG. The enlarged view which shows the wire socket side of a formwork fastening device. The enlarged view which shows the traction device side of a formwork fastening device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete hollow tower 3 Foundation 17 Inner form frame 23 Outer form frame 39 Segment 39a Adjustment frame 41 Curvature change frame 45 Push bolt 47 Segment 49 Curvature change frame 53 Pull bolt 63 Wire fixing member 65 Fastening wire 109 Wire rope

Claims (4)

A hollow tower construction method for constructing a hollow tower by stacking cylindrical structures one by one,
A plurality of segments as constituent units of an outer mold frame and an inner mold frame for constructing the cylindrical structure with concrete are prepared, and the outer mold frame and the inner mold frame are arranged in a circumferential direction. After configuring the two ends of each segment in the circumferential direction and adjusting the diameter change toward the outer mold frame and the inner mold frame by changing the overlap of the overlapped portions. A step of constructing a first cylindrical structure on a foundation by placing concrete between the outer mold frame and the inner mold frame;
A scaffold is constructed at the upper end of the first cylindrical structure, and an outer mold frame whose lower diameter is the outer diameter of the upper end of the first cylindrical structure, and the lower diameter is the first cylinder An inner mold formed on the inner diameter of the cylindrical structure is constructed on the first cylindrical structure from the plurality of segments in the same manner as in the step, and between the outer mold and the inner mold. Placing concrete and connecting a second cylindrical structure to an upper end of the first cylindrical structure;
Similarly, a third cylindrical structure on the second cylindrical structure, a fourth cylindrical structure on the third cylindrical structure, and the like, Repeating the construction of the cylindrical structure by placing concrete while sequentially reducing the diameter of the inner mold,
A method for constructing a hollow tower, comprising constructing a tower whose diameter is reduced in the upward direction. By fixing the circumferential center of the segment at the center of the frame, holding both ends of the segment in the circumferential direction by adjusting means provided at both ends of the frame, and protruding or pulling the adjusting means, hollow tower methods construction according to claim 1, characterized in that changing the curvature of its in the segment unit.   The hollow according to claim 1 or 2, wherein a winding pressure applied to the outer mold frame is supported by winding a wire around an outer periphery of the outer mold frame and tightening the wound wire. Tower construction method. In the construction of a hollow tower that builds a hollow tower while stacking the cylindrical structure step by step, it is a mold used as an inner mold frame or an outer mold frame for placing with concrete of the cylindrical structure,
A plurality of segments as structural units of the outer mold frame or the inner mold frame are arranged in the circumferential direction, and both ends in the circumferential direction of the segments are overlapped with each other to form a cylindrical frame body. Characterized in that it has an adjustment frame for changing the diameter reduction toward the top of the frame by changing the lap margin of the overlapped portion, and a curvature changing means for changing the curvature in each segment unit. Formwork for hollow tower construction.

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