JP2015124502A - Holding device of sheath pipe, slip form device, holding method of sheath pipe, and construction method of pc building frame by slip form construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deterioration of verticality and linearity of sheath pipes in accordance with weight saving of the sheath pipes.SOLUTION: A device holds sheath pipes 3, 4 which are vertically built in a PC building frame 1 to be constructed by a slip form construction method, and joined according to rise of frame molds 11, 12 and a form timbering 20, comprises a plurality of guides which are supported by the form timbering 20, and position the sheath pipe 4 at a plurality of points distant from one another in a vertical direction, in which the plurality of guides comprise: upper stage guides 110 which are the uppermost guides, and whose positions in horizontal directions are fixed; and intermediate stage guides 120 which are lower guides than the uppermost guides, and provided with adjustment mechanisms for adjusting their positions in the horizontal directions.

Description

  The present invention relates to a sheath tube holding device, a slip foam device used in a slip foam method, a sheath tube holding method in a slip foam method, and a construction method of a PC frame by the slip foam method.

  It is known to construct a concrete wall such as a breakwater of a liquefied natural gas tank by a slip form method (see, for example, Patent Document 1). In the slip form method described in Patent Document 1, a large number of torii type yokes arranged at predetermined intervals on the circumference are connected by main chord members and ring beams on the inner circumference side and the outer circumference side. By increasing the rigidity of the frame, it is trying to maintain the shape of the concrete structure to be constructed by increasing the accuracy of the position and shape of the formwork.

Japanese Patent Laid-Open No. 10-54136

  By the way, in the construction of a PC (prestressed concrete) LNG ground type tank, since prestress is introduced in the horizontal direction and the vertical direction, a sheath tube for inserting the PC steel wire is installed in the horizontal and vertical directions in the frame. Buried. Here, when the PCLNG above-ground tank is constructed by the slip foam method, a vertical sheath tube is added as the formwork rises, but the vertical sheath tube is stretched vertically. Sufficient verticality and straightness are required to avoid an increase in friction due to interference of PC steel wires. For this reason, it is necessary to suppress the sheath tube from being displaced due to a side pressure or the like at the time of placing concrete.

  However, in the case of using a lightweight sheath tube such as a steel spiral sheath, compared to the case of using a sheath tube that is heavier than that (for example, a steel tube), the sheath tube of the sheath tube due to the side pressure at the time of placing concrete is used. Deviation tends to occur.

  This invention is made | formed in view of the said situation, and makes it a subject to ensure and correct the perpendicularity and linearity of a sheath pipe | tube accompanying weight reduction of a sheath pipe | tube.

  In order to solve the above-described problems, the sheath tube holding device in the slip foam method according to the present invention is vertically built in the PC frame constructed by the slip foam method, in accordance with the rise of the formwork and the formwork support work. An apparatus for holding a sheath tube to be joined, comprising a plurality of guides that are supported by the formwork supporter and that position the sheath tube at a plurality of points that are separated from each other in the vertical direction, and the plurality of guides are uppermost guides A fixed guide whose horizontal position is fixed, and a position adjustment guide which is a guide below the fixed guide and is provided with an adjustment mechanism for adjusting the horizontal position.

  In the sheath tube holding device in the slip form method, the PC housing may be cylindrical, and the adjusting mechanism may adjust the circumferential and radial positions of the PC housing of the position adjusting guide. Good. A plurality of the position adjustment guides may be provided.

  Moreover, the slip foam apparatus which concerns on this invention is a slip foam apparatus for constructing a PC housing | casing by a slip foam construction method, Comprising: The holding | maintenance apparatus of the said sheath pipe | tube is provided.

  In addition, the method for holding the sheath tube in the slip form method according to the present invention is a method of holding the sheath tube that is vertically built on the PC frame constructed by the slip form method and added in accordance with the rise of the formwork and the formwork support. The plurality of guides supported by the formwork supporter position the sheath tube at a plurality of points separated from each other in the vertical direction, and the horizontal position of the uppermost guide is fixed. The horizontal position of the guide below the guide can be adjusted.

  Moreover, the construction method of the PC frame by the slip form method according to the present invention is a method of constructing the PC frame by the slip form method, and is built vertically to the PC frame in accordance with the rise of the formwork and the formwork support work. The sheath tube to be added is positioned at a plurality of points separated from each other in the vertical direction by a plurality of guides supported by the formwork support, and the horizontal position of the uppermost guide is fixed, The horizontal position of the guide below the uppermost guide can be adjusted.

  ADVANTAGE OF THE INVENTION According to this invention, the perpendicularity and straightness of a sheath pipe | tube accompanying the weight reduction of a sheath pipe | tube can be ensured and corrected.

It is an elevation sectional view showing the slip form device concerning one embodiment. It is an elevation sectional view showing the holding device concerning one embodiment from the peripheral direction of a structure. It is an elevation sectional view showing the holding device concerning one embodiment from the inner peripheral side of a structure. It is a plane sectional view showing the uppermost stage of the holding device concerning one embodiment. It is a plane sectional view showing the middle stage of the holding device concerning one embodiment. It is an elevation view which expands and shows an upper stage guide. It is a top view which expands and shows an upper stage guide. It is an elevation view which expands and shows a middle stage guide. It is a top view which expands and shows a middle stage guide. It is an elevational sectional view showing a procedure for installing a sheath tube. It is a top view which shows the procedure which builds a sheath pipe | tube. It is an elevation view which shows the procedure which builds a sheath pipe | tube. It is an elevational sectional view showing a procedure for installing a sheath tube. It is an elevation view which shows the procedure which builds a sheath pipe | tube. It is an elevation sectional view showing the state where PC steel material was inserted in the sheath tube.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an elevational sectional view showing a slip foam apparatus 10 according to an embodiment. A PC (prestressed concrete) structure 1 constructed using the slip foam device 10 according to the present embodiment is a liquid bank of an LNG ground type tank.

  The slip-form apparatus 10 includes an annular inner mold 11 and an outer mold 12, an annular mold support 20 that supports these, and a plurality of hydraulic jacks that lift the entire apparatus. 15 and a holding device 100 that holds the sheath tube 4. The formwork support 20 includes a plurality of torii type yokes 21 arranged at predetermined intervals in the circumferential direction of the housing 1, inner beams 40A to 40C connecting the plurality of yokes 21 in the circumferential direction, and The outer peripheral side beams 41A to 41C are provided.

  Each hydraulic jack 15 is provided corresponding to each yoke 21 and fastens a climbing rod 16 protruding upward from the upper end of the housing 1. Further, the climbing rod 16 is provided corresponding to each yoke 21 and is vertically embedded in the housing 1, and the hydraulic jack 15 rises in the vertical direction by taking a reaction force against the climbing rod 16. Lift 10

  The yoke 21 is arranged so as to straddle the housing 1 under construction, and the inner and outer molds 11 and 12 are arranged between the inner and outer column members 21A and 21B of the yoke 21. The upper and lower bellows members 23 are fixed to the inner peripheral surface of the inner peripheral mold 11, and the upper and lower bellows 24 are fixed to the outer peripheral surface of the outer peripheral mold 12. Further, the inner peripheral side erection material 23 is fixed to the inner peripheral side column member 21A via a liner, and the outer peripheral side erection member 24 is fixed to the outer peripheral side column member 21B via a liner. Yes.

  An inner upper stage scaffold 27 is fixed to a corner portion between the upper horizontal member 21C of the yoke 21 and the inner peripheral column member 21A, and an outer upper step is provided at the corner portion between the upper horizontal member 21C and the outer peripheral column member 21B. The scaffold 28 is fixed. Further, an inner middle scaffold 29 is fixed to the inner pillar 21A via beams 40B and 40C, and an outer middle scaffold 30 is fixed to the outer pillar 21B via beams 41B and 41C. ing. The inner middle scaffold 29 includes a cross member 29A and a diagonal member 29B that support the scaffold plate. The cross member 29A is fixed to the beam 40B, and the diagonal member 29B is fixed to the beam 40C. The outer middle stage scaffold 30 includes a cross member 30A and a diagonal member 30B that support the scaffold plate. The cross member 30A is fixed to the beam 41B, and the diagonal member 30B is fixed to the beam 41C. Further, an inner lower stage scaffold 31 is fixed to the lower end of the inner peripheral column 21A via a suspension member 33, and an outer lower stage scaffold 32 is fixed to the lower end of the outer peripheral column 21B via a suspension member 34. ing.

  The inner and outer beams 40A to 40C and 41A to 41C are annular H-shaped steels. The inner peripheral side beam 40A is fixed to the upper end of the inner peripheral side column member 21A, and the inner peripheral side beam 40B is fixed to the inner peripheral side column member 21A at the height of the scaffolding plate of the inner middle stage scaffold 29. The inner circumferential side beam 40C is fixed to the lower end of the inner circumferential side column member 21A. Further, the outer peripheral side beam 41A is fixed to the upper end of the outer peripheral side column member 21B, and the outer peripheral side beam 41B is fixed to the outer peripheral side column member 21B at the height of the scaffold plate of the outer middle stage scaffold 30, The side beam 41C is fixed to the lower end of the outer peripheral side column member 21B.

  The inner upper scaffold 27 and the outer upper scaffold 28 are provided with fences 42 on both sides of the scaffold plate 43. In addition, a temporary storage 44 for the sheath tube 4 is provided on the inner periphery side fence 42 of the inner upper stage scaffold 27.

  FIG. 2 is a vertical sectional view showing the holding device 100 from the circumferential direction of the housing 1, and FIG. 3 is a vertical sectional view showing the holding device 100 from the inner peripheral side of the housing 1. 4 is a plan sectional view showing the uppermost stage of the holding device 100, and FIG. 5 is a plan sectional view showing the middle stage of the holding device 100. As shown in FIG. As shown in these drawings, between the yoke 21 and the yoke 21 (between the climbing rod 16 and the climbing rod 16), a plurality of (for example, three as shown) sheath tubes 3 are provided in the housing. 1 are arranged vertically at predetermined intervals in the circumferential direction. The sheath tube 3 extends from a bottom portion of the housing 1 to a height protruding from the upper end of the housing 1 by adding a sheath tube 4 having a predetermined length (for example, about 4000 mm).

  Here, the sheath tube 3 is a steel spiral sheath, and is a lightweight one that can be handled by an operator without using a crane. On the other hand, a sheath pipe made of a steel pipe is a heavy article that requires heavy load on a crane. Therefore, in this embodiment, a steel spiral sheath that is lighter in weight and easier to handle than a steel pipe and that does not require a crane is employed.

  The holding device 100 holds each sheath tube 3 at one point on the upper stage and two points on the middle stage, and includes an upper guide 110 arranged on the upper stage and a pair of upper and lower middle guides 120 arranged on the middle stage. ing. The upper guide 110 is arranged at the height of the upper part of the fence 42 of the inner upper scaffold 27 and the outer upper scaffold 28. Further, the upper middle guide 120 is arranged at a height between the scaffold plate 43 of the inner upper scaffold 27 and the outer upper scaffold 28 and the upper cross member 21C, and the lower middle guide 120 is the height of the hydraulic jack 15. Is arranged.

  6 is an elevation view showing the upper guide 110 in an enlarged manner, and FIG. 7 is a plan view showing the upper guide 110 in an enlarged manner. As shown in these drawings and FIGS. 2 to 5, the upper guide 110 includes a U bolt 112 and an L angle 114 for each sheath tube 4. The U bolt 112 is fixed to a central portion in the longitudinal direction of one piece of the L angle 114 in a state of being tightened by a nut 116 and a convex portion 112 </ b> A of the U bolt 112. Here, between the fence 42 of the inner upper stage scaffold 27 and the fence 42 of the outer upper stage scaffold 28, a pair of left and right L-guide angles 118, which are L angles, are arranged along the tangential direction of the housing 1, and the yoke 21 Are fixed to the inner upper stage scaffold 27 and the outer upper stage scaffold 28 supported on the outer side. The outer peripheral side reinforcing bar guide angle 118 is arranged in an L-shape when viewed in the circumferential direction of the housing, and the inner peripheral side reinforcing bar guide angle 118 is arranged in an inverted L-shape when viewed in the same direction. These are welded at both ends in the longitudinal direction of the L angle 114. That is, since the upper guide 110 is supported by the yoke 21, when the slip foam device 10 is raised, the upper guide 110 is also raised.

  The U bolt 112 is arranged so that the straight portions on both sides are aligned in the horizontal direction, and the sheath tube 4 is passed between the U bolt 112 and the L angle 114, thereby determining the horizontal position. It is done. Here, the L angle 114 is supported by the yoke 21 with the horizontal relative position unchanged, and the U bolt 112 is clamped by the nut 116 and the convex portion 112A with respect to the L angle 114. Since it is fixed, the horizontal position of the upper guide 110 cannot be adjusted and is constant.

  FIG. 8 is an elevation view showing the middle guide 120 in an enlarged manner, and FIG. 9 is a plan view showing the middle guide 120 in an enlarged manner. As shown in FIGS. 8 and 9 and FIGS. 2 to 5, the middle guide 120 includes a sheath pipe 122 that is a steel pipe, a pair of dimensioning bolts 124, and a nut 126 provided in pairs for each dimensioning bolt 124. Are provided for each sheath tube 4. The middle guide 120 includes an L angle 128. The pair of dimensioning bolts 124 are arranged in parallel to each other so as to sandwich the axially central part of the sheath tube 122 in the diametrical direction, and the tip of each dimensioning bolt 124 is welded to the axially central part of the sheath tube 122. ing.

  The L angle 128 of the upper middle guide 120 is disposed along the tangential direction of the frame between the inner upper scaffold 27 and the outer upper scaffold 28, and the L angle 128 of the lower middle guide 120 is the left and right column members 21A. , 21B are arranged along the tangential direction of the housing. The L angle 128 is arranged in an L shape when viewed in the tangential direction of the housing, and a pair of dimensioning bolts 124 are fixed to a vertical piece of the L angle 128 by a pair of nuts 126. That is, since the upper and lower middle guides 120 are supported by the yoke 21 via the L angle 128, the upper and lower middle guides 120 are also raised when the slip form device 10 is raised.

  The pair of cutting bolts 124 are arranged so as to be aligned in the horizontal direction, the sheath tube 122 is disposed vertically, and the sheath tube 4 is passed through the sheath tube 122, and the sheath tube 122 causes the horizontal direction. Can be positioned. Here, the position of the casing tube 122 in the radial direction of the casing 1 can be adjusted by moving the pair of nuts 126 in the axial direction of the cutting bolt 124 and moving the cutting bolt 124 in the radial direction of the casing 1. . In addition, an elongated hole 128A extending in the horizontal direction is formed in a vertical piece of the L angle 128, and a cutting bolt 124 is inserted into the elongated hole 128A. For this reason, the position of the casing tube 122 in the tangential direction (circumferential direction) of the casing 1 can be adjusted by moving the cutting bolt 124 in the longitudinal direction of the elongated hole 128A.

  10-15 is a figure which shows the procedure in which the sheath pipe | tube 3 is built. As shown in these drawings, after placing concrete up to the vicinity of the upper end of the built-in sheath tube 3, an operation of connecting the sheath tube 4 to the upper end of the built-up sheath tube 3 is performed. Further, the sheath tube 4 is piled up to the inner upper stage scaffold 27 with a crane and temporarily placed in the temporary place 44. Then, the worker on the inner upper scaffold 27 passes the sheath tube 4 from above vertically to the worker on the inner middle scaffold 29 through the fence 42. An operator on the inner middle stage scaffold 29 performs an operation of connecting the upper end of the sheath tube 3 that has been installed and the lower end of the sheath tube 4 thereon.

  First, as shown in FIG. 10, when the upper end of the built-in sheath tube 3 is positioned between the lower middle guide 120 and the top end of the housing 1, the worker on the inner upper scaffold 27 is Then, the sheath tube 4 is lowered onto the sheath tube 3 that has been built through the U bolt 112 of the upper guide 110 and the sheath tube 122 of the upper and lower middle guides 120.

  When the upper end of the sheath tube 3 is deviated, the upper portion of the sheath tube 4 is determined as a design position by the upper guide 110. Therefore, the upper end of the sheath tube 3 and the upper sheath tube of the sheath tube 3 are determined. The position of the lower end of 4 does not match. Therefore, the position of the upper end of the sheath tube 3 is measured, and the position in the horizontal direction of the sheath tube 122 of the upper and lower middle guides 120 is adjusted according to the amount of deviation from the design value. Here, since the horizontal position of the upper end and the lower end of the sheath tube 4 is shifted, the sheath tube 4 bends in the middle, but the horizontal position of the upper and lower sheath tubes 122 is reduced so that the curvature is reduced there. Adjust.

  As shown in FIG. 11, by moving the pair of nuts 126 in the axial direction of the cutting bolt 124 and moving the cutting bolt 124 forward and backward in the radial direction of the sheath tube 122, the radial direction of the casing 1 of the sheath tube 4 is increased. Adjust the position. If the distance between the adjacent sheath tubes 4 is outside the reference range, as shown in FIG. 12, one nut 126 is loosened and the cutting bolt 124 is moved in the longitudinal direction of the elongated hole 128A. Thus, the position of the sheath tube 4 in the tangential direction (circumferential direction) of the housing 1 is adjusted.

  Then, after adjusting the horizontal position of the upper and lower middle guides 120, the lower end of the sheath tube 4 and the upper end of the sheath tube 3 are connected. Here, as shown in FIG. 13, a joint sheath 5 is fitted to one end of the sheath tube 4, and the upper end of the sheath tube 3 that has been installed by lowering the sheath tube 4 with the joint sheath 5 down. Is fitted into the joint sheath 5.

  Next, as shown in FIG. 14, the heat shrinkable tube 6 is wound around the upper end of the joint sheath 5 and the upper sheath tube 4 so as to straddle them, and the lower end of the joint sheath 5 and the upper end of the built-in sheath tube 3 are wound. The heat shrinkable tube 6 is wound so as to straddle these. And the joint sheath 5 and the upper and lower sheath tubes 3 and 4 are connected by heat-shrinking the heat-shrinkable tube 6 using the gas torch 7.

  As described above, in the sheath tube 4 holding device 100 in the slip form method according to the present embodiment, a plurality of guides that are supported by the mold support 20 and that position the sheath tube 4 at a plurality of points separated from each other in the vertical direction. (The upper guide 110 and a pair of upper and lower middle guides 120). The upper guide 110, which is the uppermost guide, has a fixed horizontal position, and a pair of upper and lower middle guides below the upper guide 110. Reference numeral 120 is provided with an adjustment mechanism for adjusting the position in the horizontal direction.

  By the way, in this embodiment, since the lightweight steel spiral sheath is used as the sheath tube 3 in consideration of workability, the sheath tube 3 is likely to be displaced due to a side pressure at the time of placing concrete. Here, as shown in FIG. 15, when the PC steel material 8, which is a tensioned PC steel wire, is vertically inserted into the sheath tube 3 embedded in the housing 1, the verticality and straight line of the sheath tube 3 are obtained. When the degree is low, the PC steel material 8 and the sheath tube 3 interfere with each other, and the friction amount of the PC steel material 8 may increase.

  Therefore, in the present embodiment, not only the upper guide 110 which is the uppermost guide but also the upper and lower middle guides 120 are provided below, thereby controlling and correcting the deviation of the sheath tube 3. Here, when not only the upper guide 110 but also the middle guide 120 is a fixed guide that cannot be adjusted in the horizontal direction, since the distance from the top end of the housing 1 to the middle guide 120 is short, the sheath tube 3, 4 is bent with a large curvature, and the sheath tube 4 reaches the middle guide 120. In this case, since the sheath tubes 3 and 4 are bent with a large curvature, the amount of friction due to the interference between the sheath tubes 3 and 4 and the PC steel material 8 increases.

  Here, in order to reduce the increase in the amount of friction due to the interference between the sheath tubes 3 and 4 and the PC steel material 8, the curvature of the sheath tubes 3 and 4 can be reduced. By enabling the horizontal position adjustment, the displaced sheath tube 3 and the sheath tube 4 connected thereto can be guided by the upper and lower middle guides 120 to the upper guide 110 so as to be bent with a small curvature. I am doing so. That is, the displaced sheath tube 3 and the sheath tube 4 connected thereto are not returned to the normal position by the upper and lower middle guides 120 but gradually approach the normal position by the upper and lower middle guides 120. Accordingly, by suppressing the curvature of the sheath tubes 3 and 4 to keep the sheath tubes 3 and 4 straight, it is possible to prevent an increase in the amount of friction due to interference between the PC steel material 8 and the sheath tubes 3 and 4. In particular, in the present embodiment, by providing two upper and lower middle guides 120 capable of adjusting the position in the horizontal direction, the displaced sheath tube 3 and the sheath tube 4 connected thereto are curved with a small curvature. Can be guided to the upper guide 110.

  In the present embodiment, the upper guide 110 is a fixed guide whose position in the horizontal direction is fixed, so that the sheath tube 4 can be positioned at the normal position in the uppermost stage of the slip foam device 10 and continuously. The upper part of the sheath tube 4 can be positioned at a normal position.

  In the present embodiment, when the cylindrical PC casing 1 is constructed, the middle guide 120 can be adjusted in the radial direction and the circumferential direction of the casing 1, so that the sheath tube in the radial direction and the circumferential direction of the casing 1 is provided. 3 can be increased, the interference between the sheath tube 3 and the PC steel material 8 can be reduced, and the amount of friction can be reduced.

  In addition, the above-mentioned embodiment is for making an understanding of this invention easy, and does not limit this invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof. For example, in the above-described embodiment, the pair of upper and lower middle guides 120 is provided, but one or more middle guides 120 may be provided. Further, the configuration of the position adjustment mechanism of the middle guide 120 is not limited to the above-described embodiment, and may be changed as appropriate. Furthermore, the U-bolt 112 of the upper guide 110 and the sheath tube 122 of the middle guide 120 are not limited to these, and can be appropriately employed as long as they form an insertion hole through which the sheath tube 4 is inserted.

1 Housing, 3, 4 Sheath tube, 5 Joint sheath, 6 Heat shrinkable tube, 7 Gas torch, 8 PC steel, 10 Slipform device, 11, 12 Formwork, 15 Hydraulic jack, 16 Climbing rod, 20 Formwork support 21 Yoke, 21A, 21B Column material, 21C Upper horizontal member, 23, 24 Raised member, 27 Inner upper scaffolding, 28 Outer upper scaffolding, 29 Inner middle scaffolding, 29A Lateral material, 29B Diagonal material, 30 Outer middle intermediate scaffolding, 30A Cross member, 30B Diagonal member, 31 Inner lower stage scaffold, 32 Outer lower stage scaffold, 33, 34 Suspension member, 40A, 40B, 40C, 41A, 41B, 41C Beam, 42 Fence, 43 Scaffold plate, 44 Temporary storage place, 100 Holding device 110 Upper guide, 112 U bolt, 112A Convex, 114 L angle, 116 nut, 1 8 rebar guide angle, 120 middle guide, 122 sheath tube, 124 Zungiri bolts, 126 nuts, 128 L angles, 128A slot

Claims (6)

A device for holding a sheath tube that is vertically built in a PC frame constructed by a slip form method and is added in accordance with the rise of the formwork and formwork support,
A plurality of guides for positioning the sheath tube at a plurality of points that are supported by the formwork support and spaced apart from each other in the vertical direction;
The plurality of guides are:
A top guide, and a fixed guide whose horizontal position is fixed;
An apparatus for holding a sheath tube in a slip form method, comprising: a guide below the fixed guide, and a position adjusting guide provided with an adjusting mechanism for adjusting a position in a horizontal direction thereof. The PC housing is cylindrical,
The sheath tube holding device in the slipform method according to claim 1, wherein the adjustment mechanism adjusts positions of the PC housing of the position adjustment guide in a circumferential direction and a radial direction.   The sheath tube holding device according to claim 1 or 2, wherein a plurality of the position adjustment guides are provided.   A slip foam device for constructing a PC housing by a slip foam method, comprising the sheath tube holding device according to any one of claims 1 to 3. It is a method of holding a sheath tube that is vertically built in a PC frame to be constructed by a slip form method and added in accordance with the rise of the formwork and formwork support,
Positioning the sheath tube at a plurality of points separated from each other in the vertical direction by a plurality of guides supported by the formwork support,
The horizontal position of the top guide is fixed,
A method of holding a sheath tube in a slip foam method, in which a guide below the uppermost guide can be adjusted in its horizontal position. It is a method of constructing a PC frame by the slip form method,
A sheath tube that is vertically built into the PC housing and is added in accordance with the rise of the formwork supporting work is sheathed at a plurality of points separated from each other in the vertical direction by a plurality of guides supported by the formwork supporting work. Position the tube,
The horizontal position of the top guide is fixed,
The guide structure below the uppermost guide is a construction method of the PC frame by the slip form method that allows the horizontal position to be adjusted.