JP2019090266A - Installation method of main leg material and installation jig of main leg material - Google Patents

Abstract

To provide an installation method of a main leg material and an installation jig of a main leg material which can suppress positional deviation caused by batter of an upper part of a main leg material and which can further improve positioning accuracy when installing a main leg material on a foundation pile.SOLUTION: An installation method of a main leg material 40 of a steel tower comprises: installing a foundation pile in an underground; installing a formwork 30 for installing concrete in a fixing portion on the foundation pile; making the foundation pile support a lower part of the main leg material 40; installing a jig 100 (a jig for installing the main leg material) at an upper edge of the formwork 30; positioning an upper part of the main leg material 40 with the jig 100; and installing concrete (fixing concrete) in the formwork 30 to form the fixing portion.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a main leg installation method for installing a main leg forming a leg of a steel tower on a foundation pile, and a main leg installation jig for supporting the main leg.

  Generally, legs of a huge structure (hereinafter simply referred to as a steel tower) such as a power transmission tower which is located in a mountainous area are supported by a foundation pile such as a deep foundation (for example, Patent Document 1). In Patent Document 1, a support is installed on the wall surface of a drilled hole excavated in the ground, and the support is made to support a beam. Then, the mounting block is disposed on the beam, and the lower end of the main leg is positioned by the mounting block. Thereby, the position of the main leg relative to the beam can be easily adjusted, and the work efficiency at the time of positioning of the main leg can be enhanced.

JP 2017-96052 A

  Here, in general, the steel tower has a shape in which four legs are arranged at the four corners of a square and they are connected at the top of the steel tower. For this reason, the main leg material which constitutes a leg turns into a posture where it inclines toward the center of a steel tower as it goes upwards. Since the main leg is heavy, the upper part may be inclined inward when it is in the inclined posture, so-called rolling may occur and positional deviation may occur. However, in the installation method of Patent Document 1, it is difficult to suppress the fall of the main leg and, consequently, the positional deviation of the upper part caused thereby. Therefore, although the installation method of Patent Document 1 can improve the positioning accuracy more than the prior art, there is room for further improvement.

  In view of such a subject, the present invention suppresses the position gap resulting from the fall of the upper part of the main leg material, and can improve the positioning accuracy at the time of installing the main leg material to a foundation pile further. It is an object of the present invention to provide a method and a main leg installation jig.

  In order to solve the above problems, a typical configuration of the main leg installation method according to the present invention is an installation method of a main leg of a steel tower, in which a foundation pile is installed in the ground, and is placed on the foundation pile. Install a form for concrete placement at the anchorage section, support the lower part of the main leg on the foundation pile, install the main leg installation jig at the upper edge of the form, and place the upper part of the main leg on the main leg It is characterized by positioning with a material installation jig, and placing concrete in a formwork to form a fixing part.

  According to the above configuration, the lower part of the main leg is supported by the foundation pile and the upper part is positioned by the main leg installation jig. Thereby, since the upper part of the main leg material is fixed to the main leg material installation jig in the state where position adjustment was carried out, position shift of the upper part of the main leg material can be prevented suitably. Therefore, the positional offset of the upper part of the main leg material resulting from a fall is suppressed, and it becomes possible to further improve the positioning accuracy at the time of installing the main leg material to a foundation pile.

  In order to solve the above-mentioned subject, the typical composition of the main leg material installation jig concerning the present invention is mainly attached to the formwork arranged on the foundation pile of a steel tower, and supports the main leg material of a steel tower A leg mounting fixture, comprising: a beam passed to an upper end of a form; and a support connected to a central portion of the beam and in contact with a main leg. Thereby, it becomes possible to support a main leg material suitably by a support part, installing a main leg material installation jig on the upper end of a formwork with a beam.

  The support portion may have a plate-like through hole through which the main leg passes. According to this configuration, the main leg can be easily attached to the main leg mounting jig by penetrating the through hole.

  The support may have a first plate fixed to the beam and a second plate adjustably fixed to the beam so that the main leg passes through the gap between the first plate and the second plate. As a result, the main leg member is inserted into the gap between the second plate and the first plate while the second plate is separated from the first plate, and the main plate is fixed to the main leg member by moving the second plate toward the first plate. It can be easily attached to the

  The main leg fixture may further include an adjustment bolt fixed to the beam to adjust the roll of the main leg. This makes it possible to further improve the positional accuracy when installing the main leg on the foundation pile.

  According to the present invention, there is provided a main leg installation method and main leg member capable of suppressing positional deviation due to the upper leg of the main leg member and further enhancing the positioning accuracy when installing the main leg member on a foundation pile. An installation jig can be provided.

It is a figure explaining the main leg material installation method concerning this embodiment. It is a figure explaining the main leg material installation method concerning this embodiment. It is a figure explaining the main leg material installation method concerning this embodiment. It is a perspective view of Fig.3 (a). It is a whole perspective view of the installation block shown in FIG. It is a whole perspective view of the jig shown in FIG. It is a figure explaining the other example of the fixing method of the jig | tool to a formwork. It is a figure explaining the other example of a jig.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values and the like shown in the embodiments are merely examples for facilitating the understanding of the invention, and the invention is not limited except as otherwise described. In the present specification and drawings, elements having substantially the same functions and configurations are denoted by the same reference numerals to omit repeated description, and elements not directly related to the present invention are not illustrated. Do.

  1 to 3 are diagrams for explaining the main leg installation method according to the present embodiment. FIG. 4 is a perspective view of FIG. 3A and is a view for explaining the main leg installation jig according to the present embodiment. FIG. 4 illustrates the main leg member 40 on which the main leg installation jig (hereinafter simply referred to as the jig 100) and the installation block 200 of the present embodiment are installed, as viewed obliquely from above.

  In the main leg installation method of the present embodiment (hereinafter simply referred to as the installation method), as shown in FIG. 1 (a), the excavation hole 10 is formed by excavating the ground first, and Assemble the rebar 14 inside.

  Next, as shown in FIG. 1 (b), a foundation concrete 18 is formed in the inside of the drilling hole 10, that is, in the ground, by placing a concrete body 16 (shown by hatching) in the drilling hole 10. After the foundation pile 18 is installed in the ground, as shown in FIG. 1 (c), the installation block 200 is placed inside the frame rebar 14 and a leveling concrete 20 (shown by hatching) is cast. The mounting block 200 will be described in detail later.

  After the installation block 200 is placed, as shown in FIG. 2A, the hoop reinforcement 12 is wound around the reinforcing bar 14, and the concrete casting form 30 of the fixing portion 70 to be described later is leveled concrete 20 and the foundation Arranged above the stake 18. Then, as shown in FIG. 2B, the lower portion (lower end) of the main leg member 40 is supported by the mounting block 200 on the foundation pile 18, and the jig 100 is installed on the upper edge of the formwork 30. As a result, the lower part of the main leg member 40 is supported by the mounting block 200, and the upper part (upper half part) is supported by the jig 100.

  FIG. 5 is an overall perspective view of the mounting block 200 shown in FIG. In addition, in order to make an understanding easy, in FIG. 5, the main leg material 40 is illustrated with an imaginary line. In the installation method of the present embodiment, an installation block 200 for supporting the lower end of the main leg 40 is disposed at the center in the width direction of the foundation pile 18.

  Specifically, as shown in FIG. 5, the installation block 200 is configured to include a plate-like installation base 210. On the top surface of the mounting stand 210, L-shaped fixed bolt holding portions 222a, 222b, and 222c are provided. The fixing bolt holding portions 222 a to 222 c hold the main leg fixing bolts 220 a, 220 b, and 220 c for fixing the main leg 40 in a posture of advancing and retracting in parallel with the upper surface of the mounting rack 210. Thereby, the main leg member 40 is fixed to the installation stand 210 by sandwiching the main leg member 40 by the main leg member fixing bolts 220a to 220c.

  Further, as shown in FIG. 5, holes 260 a, 260 b, 260 c and 260 d are formed in the mounting stand 210. Through the holes 260a to 260d, a plurality of (for example, four in this embodiment) screw columns 230a, 230b, 230c, and 230d for supporting the mounting frame 210 are respectively inserted. The lower ends of the pillars 230a to 230d are embedded in the concrete frame 16 and the foundation pile 18 (see FIGS. 1 (b) and 1 (c)).

  Further, as shown in FIG. 5, fixing nuts 250 a, 250 b, 250 c, and 250 d disposed on the upper side of the installation stand 210 are screwed into the columns 230 a to 230 d. Upper stoppers 252a, 252b, 252c and 252d are respectively disposed between the fixing nuts 250a to 250d and the mounting base 210.

  By installing the mounting block 200 as described above, the lower portion of the main leg 40 can be positioned accurately and easily. Therefore, the work efficiency at the time of positioning of the main leg 40 can be improved, and it is possible to significantly reduce the labor and work time of the worker. The above-described installation block 200 is merely an example, and it is naturally possible to use other jigs as long as the lower part of the main leg 40 can be supported.

  6 is an overall perspective view of the jig 100 shown in FIG. In the installation method of this embodiment, the upper part of the main leg 40 is positioned using the jig 100 shown in FIG. Specifically, as shown in FIG. 6, the jig 100 of the present embodiment is configured to include the beam 110 and the support portion 120. The beam 110 is formed of an angled member having an L-shaped cross section, and is passed to the upper end of the formwork 30 (see FIG. 2B). In the present embodiment, the two beams 110 are connected by a first connecting portion 130a and a second connecting portion 130b provided therebetween.

  The support portion 120 is a portion connected to the central portion of the beam 110 and in contact with the main leg 40. In particular, in the present embodiment, the support portion 120 is configured to include a first plate 122 and a second plate 124 which are two plate-like members. The first plate 122 is fixed to the beam 110, and the second plate 124 is fixed to the beam 110 in a position-adjustable manner.

  Further, a gap is provided between the first plate 122 and the second plate 124. This gap is a through hole 140 through which the main leg 40 passes. The through hole 140 is shaped in accordance with the angle shape of the main leg member 40, and the main leg member 40 can be straightened by fitting the main leg member 40 into the through hole 140.

  In addition, although the structure by which the support part 120 is formed by two plates which consist of the 1st plate 122 and the 2nd plate 124 was illustrated in this embodiment, it does not limit to this. The support part 120 may be comprised by one plate-shaped member, and in that case, the through-hole of the cross-sectional shape of the main leg material 40 should just be formed in a plate-shaped member.

  In the present embodiment, the second plate 124 is formed with an adjustment hole 126 of a long hole in the vicinity of the beam 110, and the fixing bolt 128 is inserted through the adjustment hole 126. This makes it possible to slide and adjust the position of the second plate 124 with respect to the beam 110 in a state in which the fixing bolt 128 is loosened.

  Further, in the present embodiment, the jig 100 is provided with a column center punch mark 152 and a tilt adjustment memory 154. The column center punch mark 152 is provided at the first connecting portion 130 a disposed near the center of the steel tower (not shown in its entirety), and is used for aligning the main leg 40 in the horizontal direction (rotational direction). The tilt adjustment memory 154 is a memory inscribed on the second plate 124 at predetermined intervals, and is used to adjust the tilt (rolling) of the main leg 40. Furthermore, in the present embodiment, adjustment bolts 162a, 162b, and 162c are fixed to the beam 110 via the first connecting portion 130a and the second connecting portion 130b in the jig 100.

  When attaching the jig 100 to the upper part of the main leg 40, the main leg 40 is first passed through the through hole 140 which is the gap between the second plate 124 and the first plate 122 in a state of being separated from the first plate 122. Then, the second plate 124 is slid toward the first plate 122, and the first plate 122 and the second plate 124 are brought into contact with the main leg 40. At this stage, it is preferable that the fixing bolts 128 be slightly loosened and hand-tightened. When the angle of the main leg 40 changes, the width of the through hole 140 (the distance between the first plate 122 and the second plate 124) slightly changes.

  Refer again to FIG. As described above, when the main leg 40 is placed on the foundation pile 18 by the jig 100 and the mounting block 200, the position adjustment of the main leg 40 is performed. In the position adjustment of the main leg 40, first, as shown in FIG. 2 (b), the tower core punch mark 152 (see FIG. 6) is disposed at a predetermined position, that is, a position facing the tower center (not shown) of the steel tower. The jig 100 is rotated horizontally to move the jig 100 horizontally. It should be noted that, instead of the tower of the steel tower, diagonal main legs may be used as an index of the punch core 152. When the tower punch mark 152 is placed at a predetermined position by this operation, the horizontal direction of the main leg 40 is adjusted.

  Next, the tilt of the main leg 40 is adjusted using the weight 50. Specifically, as shown in FIG. 2C and FIG. 4, first, the weight 50 (down and down) is suspended from the upper end of the main leg 40. Then, the position of the jig 100 is moved in the front-rear direction (rolling direction, that is, the axial direction of the beam 110) so that a predetermined memory of the memory for tilt adjustment 154 is disposed immediately below the weight 50. By this operation, when a predetermined memory of the inclination adjustment memory 154 is disposed immediately below the weight 50, the inclination angle (rolling) of the main leg member 40 is adjusted. When the angle of the main leg 40 is roughly determined, the fixing bolt 128 is tightened to fix the second plate 124 to the support portion 120.

  At this time, particularly in the present embodiment, for adjusting the inclination of the main leg 40, not the punch mark but the memory 154 for adjusting the inclination is used. Assuming that punch marks are used, since only one inclination angle can be handled, it is necessary to prepare the second plate 124 for each of the main legs 40 having different inclinations. On the other hand, it is possible to cope with the main leg members 40 having different inclinations by changing the memory to be used by using the inclination adjustment memory 154 in which a plurality of memories are incised as in this embodiment. . Therefore, the application range of the second plate 124 is expanded, and the cost of the jig 100 can be reduced.

  Further, as described above, in the present embodiment, the adjustment bolts 162 a to 162 c are provided in the jig 100. By pressing the formwork 30 with the adjustment bolts 162a to 162c, the position of the jig 100 in the front-rear direction (rolling direction) can be finely adjusted, and in turn, the inclination of the main leg 40 can be finely adjusted. Therefore, it becomes possible to raise the accuracy of positioning of the main leg 40.

  Thus, the twist of the main leg 40 is corrected by the through hole 140, and the horizontal direction (rotational direction) of the main leg is obtained by aligning the rotational direction of the jig 100 with respect to the form 30 with the punch center punch mark 152. Adjusted. Then, the inclination angle (tilt angle) of the main leg member is adjusted by the position of the support portion 120 in the front-rear direction (roll direction) with respect to the mold frame 30.

  After the main leg member 40 is positioned by the jig 100, as shown in FIG. 3A, the jig 100 is fixed to the form 30 by a C-shaped vice 60. After the jig 100 is fixed to the formwork 30, concrete for fixing 32 (shown by hatching) is placed in the formwork 30 as shown in FIG. 3 (b). Then, by removing the C-type vise 60, the jig 100, and the mold 30, the fixing portion 70 of the main leg member 40 is formed as shown in FIG. 3C. Thereafter, the periphery of the fixing portion 70 is backfilled with the backfilling material 80, whereby the installation work of the main leg 40 on the foundation pile 18 is completed.

  As described above, according to the main leg installation method of the present embodiment, the lower part of the main leg 40 is supported by the foundation pile 18, and the upper part is positioned by the jig 100. By positioning the upper portion of the main leg member 40 in this manner, such positional deviation of the upper portion can be suitably prevented. Therefore, the positional offset of the upper part of the main leg material 40 resulting from a fall is suppressed, and the positioning accuracy at the time of installing the main leg material 40 to the foundation pile 18 can further be raised.

  FIG. 7 is a view for explaining another example of the method of fixing the jig 100 to the mold 30. As shown in FIG. As shown in FIG. 4, in the above-described embodiment, the configuration in which the jig 100 is fixed to the mold 30 using a C-type vise 60 has been exemplified. On the other hand, in the example shown in FIG. 7, the jig 100 is fixed to the mold 30 using the connecting member 300.

  In detail, the connection member includes the connection plate 310 and the connection bolt 320. In the connection plate 310, an arc-shaped elongated hole 312 is formed at a position where the beam 110 of the jig 100 is disposed. The connection plate 310 is connected to the upper surface of the form 30 by the connection bolt 320, whereby the connection member 300 is fixed to the form 30. On the other hand, the beam 110 of the jig 100 is provided with a connecting hole 170 extending in the longitudinal direction of the beam 110 and a connecting bolt 172 inserted into the connecting hole 170.

  In the above configuration, the connection bolt 172 inserted into the connection hole 170 is inserted into the long hole 312 of the connection member 300 fixed to the mold 30 and fastened by a nut (not shown). As a result, the jig 100 is fixed to the form 30 via the connecting member 300. Therefore, the jig 100 can be easily attached to the mold 30 without using the C-type vise 60 illustrated in FIG. 4.

  Further, as shown in FIG. 7, since the elongated hole 312 is arc-shaped, the horizontal direction (rotational direction) of the main leg member 40 can be finely adjusted by moving the connecting bolt 172 in the elongated hole 312. Furthermore, since the connecting hole 170 is also an elongated hole extending in the longitudinal direction of the beam 110, the inclination of the main leg 40 can be finely adjusted by moving the connecting bolt 172 in the connecting hole 170.

  FIG. 8 is a view for explaining another example of the jig. Hereinafter, about the component substantially the same as the jig | tool 100 shown in FIG. 6, description is abbreviate | omitted by attaching | subjecting the same code | symbol. In the jig 100 shown in FIG. 6, the through holes 140 of the support portion 120 are also substantially L-shaped so as to correspond to the main leg members 40 having an L-shaped cross section.

  On the other hand, the support 420 of the jig 400 shown in FIG. 8 has a shape in which the side of the second plate 424 opposite to the first plate 122 is cut into a triangle. As a result, the main leg 42 made of a steel pipe can be held between the first plate 122 and the second plate 424, and the main leg 42 can be suitably supported at the support portion.

  In addition, although the structure which installs the main leg material 40 in the general foundation pile 18 was illustrated in embodiment described above, it does not limit to this. The main leg installation method and the main leg installation jig of the present embodiment can also be applied to the case where a deep foundation is used as a foundation pile. In that case, a liner plate (not shown) installed inside the drilled hole 10 may be used as the mold 30 when forming the foundation.

  Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the appended claims, and of course these also fall within the technical scope of the present invention. It is understood.

  INDUSTRIAL APPLICABILITY The present invention can be used as a main leg installation method for installing a main leg forming a leg of a steel tower on a foundation pile, and a main leg installation jig for supporting the main leg.

DESCRIPTION OF SYMBOLS 10 ... Drilling hole, 12 ... Hoop line, 14 ... Body reinforcement, 16 ... Body concrete, 18 ... Foundation pile, 20 ... Leveling concrete, 30 ... Formwork, 32 ... Concrete for fixation, 40, 42 ... Main leg material, DESCRIPTION OF SYMBOLS 50 ... Weight 60-C type vise 70 ... Fixation part 80 ... Backing-back material 100 ... Jig, 110 ... Beam, 120 ... Support part, 122 ... 1st plate, 124 ... 2nd plate, 126 ... Adjustment hole 128 Fixing bolt 130a First connecting part 130b Second connecting part 140 Through hole 152 Tower center punch mark 154 Memory for tilt adjustment 162a, 162b, 162c Adjustment bolt , 170 ... connection hole, 172 ... connection bolt, 200 ... installation block, 210 ... installation base, 220a, 220b, 220c ... main leg fixing bolt, 222a, 222b, 222c ... fixing bolt retention Parts, 260a, 260b, 260c, 260d: holes, 300: connection members, 310: connection plates, 312: elongated holes, 320: connection bolts, 400: jigs, 420: support portions, 424: second plate, 440: Through hole

Claims (5)

The installation method of the main leg of the steel tower,
Set up a foundation pile in the ground,
Install a concrete casting form of the anchorage on the foundation pile,
The lower portion of the main leg material is supported by the foundation pile,
Install the main leg installation jig at the upper edge of the formwork,
Positioning the upper portion of the main leg with the main leg mounting jig;
The main leg material installation method characterized by pouring concrete in said formwork and forming said fixing | fixed part. A main leg mounting jig mounted on a form placed above a foundation pile of a tower and supporting a main leg of the tower,
A beam passed to the top of the formwork,
A support connected to the central portion of the beam and in contact with the main leg;
A main leg mounting jig characterized by comprising:   The main leg installation jig according to claim 2, wherein the support portion has a plate-like through hole through which the main leg passes. The support includes a first plate fixed to the beam and a second plate positionably fixed to the beam.
The main leg installation jig according to claim 2, wherein the main leg passes through a gap between the first plate and the second plate.   The main leg installation jig according to any one of claims 2 to 4, further comprising an adjustment bolt fixed to the beam and adjusting a roll of the main leg.

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