JP2007270431A - Cylindrical column erection method and erection jig - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical column erection jig which contributes to erection of an embedded column base with good workability and to shortening of a construction period. <P>SOLUTION: The cylindrical column erection method 1 is formed of a flat base plate 7, adjusting bolts 8, long adjusting rods 9, and a band member 10. The base plate 7 has a through hole formed at the center thereof, into which an anchor bolt is inserted, and bolt screwing holes formed at corner portions of a lower surface thereof. The adjusting bolts 8 are screwed into the bolt screwing holes, respectively. The adjusting rods 9 are each fitted to a head of the adjusting bolt, and have a head thereof located above an upper surface of a foundation section when erected. The band member 10 rotatably supports the adjusting rods and it is rigidly wound on the column base. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides the accuracy of level adjustment and erection adjustment when building a cylindrical column such as a precast concrete column (hereinafter referred to as a PC column) or a steel pipe column manufactured in advance in a factory. The present invention relates to a method for constructing a cylindrical column for holding it constant and a construction jig for the method.

Conventionally, in order to build the cylindrical column on the foundation, for example, as shown in FIG. 8, in the case of an exposed column base, the column base is installed at the upper end of the foundation concrete with a base plate and anchor bolts. The position is adjusted with an anchor bolt, and the level is adjusted with a base mortar (see Patent Document 1). As shown in FIG. 9, in the case of an embedded column base, an opening for embedding the column base is provided by unboxing to construct a foundation beam, and a cylinder such as a PC column or a steel column is formed in the opening. It is known that after putting up a column-shaped column base, concrete is placed and integrated between the opening and the column base (see Patent Document 2).
JP-A-10-121576 Japanese Patent Laid-Open No. 10-18300

  However, in the case of the conventional cylindrical column construction jig, in the case of the exposed column base, if the position of the anchor bolt is deviated, it is repaired, and the construction period is extended, which adversely affects the quality. Moreover, it takes 3 to 5 days for the base mortar to develop to the required strength, and the work period is extended by the duration of the curing period. On the other hand, in the case of the embedded column base, since the column base is installed in the boxed opening, subsequent position adjustment and level adjustment are difficult. Such a built-in method using embedded column bases can be expected to have bending strength structurally. Therefore, if the position adjustment and level adjustment are efficient and easy, it becomes the most preferable method for a high-rise building. The method of erection of the column and the erection jig used therefor have been proposed in order to solve such problems.

  The gist for solving the above-mentioned problems of the method for constructing a cylindrical column according to the present invention is to assemble the cylindrical column in a box opening formed on the base, and to form the cylindrical column. In the embedded column base method, in which the cylindrical column and the foundation are integrated by placing concrete in the gap of the opening after adjusting the level of the column and adjusting the vertical accuracy of the building, An adjustment bolt is provided on the base plate which is positioned by being inserted into the through hole at the upper end of the anchor bolt provided on the base plate and is installed at the lower end of the cylindrical column, and the cylindrical column is connected to the base portion. After installing the anchor bolt through the through hole of the base plate and positioning, the long adjustment rod that adjusts the vertical movement by rotating the adjustment bolt from above the opening, Level adjustment and drooping of cylindrical pillar Among the direct accuracy adjustments, at least the vertical accuracy adjustment is performed.

Further, the gist of the cylindrical column building method according to the present invention is that the cylindrical column is built in a box opening formed in the base, and the level adjustment of the cylindrical column and the erection accuracy adjustment are performed. In the embedded column base method in which concrete is placed in the gap between the openings and the cylindrical column and the foundation are integrated, the cylindrical column is installed when the foundation is constructed. A step of embedding an anchor bolt in a central portion at a planned position, and a pillar base portion of the cylindrical column having a through hole through which the anchor bolt is inserted in a central portion and a bolt at a corner portion of the lower surface When a flat base plate provided with a screw hole, an adjustment bolt screwed into the bolt screw hole, and the head of the adjustment bolt are rotated by being fitted and rotated. A long adjustment rod that is located above the top surface of the base, A construction jig comprising a band member that rotatably supports the adjustment rod and is fixed around the column base is prepared, the base plate is attached to the lower end surface of the column base, and the adjustment rod is attached to the adjustment bolt. A step of mounting the band member rotatably supported in a state fitted to the head on the top of the column base, and lifting the cylindrical column mounted with the construction jig with a lifting means, the opening A step of inserting the anchor bolt into the through hole in the central portion of the base plate while setting it from the column base, setting a handle on the head of the adjusting rod, rotating the adjusting bolt, and rotating the cylinder A step of performing at least vertical accuracy adjustment among level adjustment and vertical accuracy adjustment of the cylindrical column, a step of fixing the position of the adjusted cylindrical column with a fixing jig, and a band member of the building jig, The adjustment rod and the cylindrical column A step of removal, is that comprising the step of pouring concrete into said opening.
In addition, a level adjusting nut is provided on the upper portion of the anchor bolt.

The gist for solving the above-mentioned problems of the cylindrical column construction jig according to the present invention is to have a through hole through which an anchor bolt is inserted at the center and for the bolt at the bottom corner. When the flat base plate provided with screw holes, the adjustment bolts screwed into the screw holes for bolts, and the heads of the adjustment bolts are fitted and rotated so that the positions of the heads are erected It is composed of a long adjustment rod that is located above the upper surface of the base portion, and a band member that rotatably supports the adjustment rod and is wound around and fixed to the column base.
Furthermore, the screw hole for bolt includes a nut welded to the lower surface of the base plate and a bolt through hole provided in the plate so as to communicate with the nut. .

According to the cylindrical column erection method and the erection jig of the present invention, in the embedded column base method, level adjustment and vertical erection accuracy adjustment, which have been extremely difficult in the past, can be performed on the upper surface of the foundation. The operator can easily perform it. Furthermore, the level can be adjusted with an adjustment bolt, and the work can be done from the top of the foundation with a long adjustment rod, so there is no need to make a base mortar. Work period is shortened.
In addition, the erection adjustment and the level adjustment can be performed at the same time, and the work period of the adjustment work is shortened.
Furthermore, by providing a nut for adjusting the level on the anchor bolt, only the vertical accuracy adjustment by the adjusting bolt is performed, the work process is reduced, and the work efficiency is improved.

  As shown in FIGS. 1 to 3, the cylindrical column construction jig 1 according to the present invention is, for example, a box-opening in which a PC column 2 having a hollow central portion is formed in a base portion 3. After adjusting the level of the PC pillar 2 and adjusting the installation accuracy, the concrete 5 is placed in the gap of the opening 4 so that the PC pillar 2 and the foundation part 3 are integrated. It is used in the embedded column base method.

  The construction jig 1 will be described. As shown in FIGS. 1 to 3, the construction jig 1 has a through hole 7a through which an anchor bolt 6 described later is inserted in the center portion and a metal having a screw hole 7b for a bolt in a corner portion of the lower surface. A rectangular base plate 7 made of a flat plate made of metal, an adjustment bolt 8 screwed into the bolt screw hole 7b, and a lower fitting portion 9b fitted into the head 8a of the adjustment bolt 8 and rotated. A long metal adjusting rod 9 whose head 9a is positioned above the upper surface 3a of the base portion 3 when the PC pillar 2 is installed, and the adjusting rod 9 is rotatable. The band member 10 is supported and wound around the column base 2a.

  As shown in FIG. 2, the bolt screw hole 7 b of the base plate 7 includes a nut 11 welded and fixed to the lower surface 7 c of the base plate 7, and a bolt provided in the plate 7 so as to communicate with the nut 11. And a through-hole 7d for use.

  As shown in FIG. 1, the adjustment bar 9 is arranged so that the operator can adjust the adjustment pole 9 from the upper surface of the foundation 3 when the PC pillar 2 is installed in the opening 4. The length of the portion 9a is set to be higher than the upper surface 3a of the base portion 3.

  As shown in FIG. 3, the belt member 10 has a semi-circular strip plate 10a, 10b divided into two, and a hole projecting radially at the end of the strip plate and fastened with a bolt and a nut. The connecting portions 10c and 10d provided, and the support portions 10e provided at four locations in the outer circumferential direction of the belt plates 10a and 10b, which rotatably support the adjusting rod 9 by inserting the adjusting rod 9 into the support hole 10f. Has been.

  The construction method of the first embodiment according to the present invention will be described using the construction jig 1 configured as described above. First, as shown in FIG. 1, when the foundation part 3 is constructed, the opening part 4 is constructed by unboxing. Then, when the foundation portion 3 is constructed, the anchor bolt 6 is embedded in the central portion of the PC pillar 2 at the planned construction position.

  Next, the columnar part 2a of the PC pillar 2 has a through hole 7a through which the anchor bolt 6 is inserted in the center part, and a flat and rectangular shape in which a screw hole 7b for bolts is provided at the corner of the lower surface. The base plate 7 is attached to the lower end surface of the column base 2a. Then, four adjustment bolts 8 are screwed into the bolt screw holes 7b. The lower end surface of the adjustment bolt 8 is protruded downward from the nut 11. And the band member 10 of 2 divisions is wound around the upper part of the said column base 2a, and this is fixed with a volt | bolt nut.

  The adjustment rod 9 is inserted into the support member 10 f from above on the wound band member 10, and the lower portion 9 b is fitted to the head 8 a of the adjustment bolt 8. This is done in the same way at four locations. Note that the base plate 7 is attached to the lower end surface of the PC pillar 2 using an adhesive or the like.

  Next, the PC column 2 to which the construction jig 1 is attached is lifted with clay, and the column base 2 a is installed in the opening 4. At that time, the PC pillar 2 is lowered while taking care that the tip of the anchor bolt 6 is inserted into the through hole 7a in the center of the base plate 7.

  Thereafter, the head 9a of the adjusting rod 9 is elongated so as to be located above the upper surface 3a of the base 3, so that a handle 12 is attached to the head 9a below the opening 4. The adjustment bolt 8 is rotated from above the base portion 3 via the adjustment rod 9 to adjust the level of the PC pillar 2 and the vertical accuracy. The vertical accuracy of the PC pillar 2 is confirmed while confirming with a transit.

  Next, as shown in FIG. 4, the adjusted PC pillar 2 is fixed in position by sandwiching wedge-shaped fixing jigs 13 at four locations. After the PC pillar 2 is fixed in this way, the crane wire is removed from the PC pillar 2, and the band member 10 and the adjusting rod 9 of the construction jig 1 are removed from the PC pillar 2. Thereafter, concrete 5 is placed in the opening 4.

  As shown in FIG. 2, the construction method according to the second embodiment has a taper portion that guides the anchor bolt 6 to be smoothly inserted into the through hole 7a on the lower surface of the through hole 7a of the base plate 7. This is performed by providing the guide member 14 that is provided. Thereby, as shown to FIG. 5 (A), the upper end of the anchor bolt 6 can be easily inserted in the through-hole 7a at the time of the erection of the PC pillar 2. Work efficiency is improved.

  In the third embodiment of the present invention, as shown in FIG. 5B, a level adjusting nut (double nut) 15 is provided on the upper portion of the anchor bolt 6. Thereby, the right angle accuracy of the PC pillar 2 is performed by the adjusting bolt 8, and the level adjustment is performed by the nut 15. If the nut 15 is positioned with high accuracy, the work efficiency can be improved in a shorter time than when both the adjustment bolts 8 are adjusted.

  In the fourth embodiment of the present invention, as shown in FIG. 5 (C), after adjusting the level with the nut 15 for level adjustment, the base plate 7 is lifted when the right angle accuracy is adjusted with the adjusting bolt 8. The holding means 16 is provided so as not to exist.

  The holding means 16 has a cylindrical cap 16a fixed to the upper surface of the base plate 7 in advance by means of welding or the like. After the PC column 2 is installed, an injection pipe is inserted into the hollow portion of the PC column 2 from above. It is lowered and connected to the cap 16a, and an epoxy resin or the like is injected into the cap 16a and filled. The injection pipe is then removed from the cap 16a and removed.

  In addition, the wedge-shaped fixing jig 13 shown in FIG. 4 can be used without being used as long as the PC pillar 2 can be self-supported by the four adjusting bolts 8. Further, as shown in FIG. 6, as related to the present invention, a level-adjusted base mortar 18 is formed at the bottom of the opening 4, and the vertical adjustment of the PC pillar 2 is performed horizontally on the top of the opening 4. This is performed by the provided jack 17.

  For level adjustment by the base mortar 18, as shown in FIG. 7A, the base plate 20 on the lower surface of the PC pillar 2 has a mortar-shaped receiving member in which a conical recess is formed at the center of the lower surface. 19 is provided, and the base mortar 18 is formed in a conical mountain shape at a predetermined position as shown in FIG. In addition, in order to shorten the curing of the base mortar 18, it is preferable that it is made of metal such as steel.

  The PC pillar 2 to which the base plate 20 is attached is erected in the opening 4. Now, the level adjustment and the erection positioning are completed at the same time, so the jacks 17 are installed at four positions above the opening 4. By operating the jack 17, the PC column 2 is adjusted while checking the accuracy in the direction perpendicular to the PC column 2 with a transit or the like. Thereafter, concrete 5 is placed in the gap of the opening 4. The jack 17 is removed. Thus, the erection of the PC pillar 2 is performed efficiently. Overall, the number of parts is small, and it can be implemented at low cost.

  In each of the above-described embodiments, the PC pillar 2 has been described. However, the present invention is not limited to this, and H-shaped steel, steel pipe pillars, and the like can be similarly adjusted.

It is a longitudinal cross-sectional view explaining the construction method using the construction jig 1 of the cylindrical pillar which concerns on this invention. It is a partially expanded front view of the base plate 7 in the cylindrical pillar construction jig 1 of the same invention. 3 is a perspective view of a band member 10. FIG. It is explanatory drawing of the state which built the PC pillar 2 and fixed the position with the fixing jig 13. FIG. It is a front view (A) which shows each example of anchor bolt 6 and base plate 7 (A), (B), and (C). It is a longitudinal cross-sectional view which shows another Example. It is the perspective view (A) of the baseplate 20 which concerns on the other Example, and the front view (B) of the base mortar 18. FIG. It is a longitudinal cross-sectional view in the case of the exposed column base which concerns on a prior art example. It is a longitudinal cross-sectional view in the case of the embedded column base which concerns on the same prior art example.

Explanation of symbols

1 Cylindrical column construction jig,
2 PC pillar, 2a pillar base,
3 foundation, 3a top surface,
4 openings,
5 Concrete,
6 Anchor bolt,
7 Base plate, 7a Through hole,
7b Screw holes for bolts, 7c Bottom surface,
7d Bolt through hole,
8 Adjustment bolt, 8a Head,
9 Adjustment bar, 9a Head,
9b fitting part,
10 Band member, 10a, 10b Band plate,
10c, 10d connecting portion, 10e supporting portion,
10f support hole,
11 nuts,
12 Handle,
13 Fixing jig,
14 guide members,
15 nuts,
16 holding means, 16a cap,
17 Jack,
18 Adjustment bolt,
19 receiving member,
20 Base plate.

Claims (5)

After installing the cylindrical pillar in the opening of the box formed on the foundation, adjusting the level of the cylindrical pillar and adjusting the vertical accuracy of the building, placing concrete in the gap of the opening, In the embedded column base method of integrating the cylindrical column and the foundation,
An adjustment bolt is provided that can be moved up and down on a base plate that is positioned by being inserted through the through hole at the upper end of the anchor bolt provided on the base side, and is installed at the lower end of the cylindrical column,
After laying the cylindrical pillar in the opening of the base portion and positioning the anchor bolt through the through hole of the base plate,
Performing at least vertical accuracy adjustment of level adjustment and vertical accuracy adjustment of the cylindrical column with a long adjustment rod that adjusts the vertical movement by rotating the adjustment bolt from above the opening;
How to build a cylindrical pillar characterized by After installing the cylindrical pillar in the opening of the box formed in the base, adjusting the level of the cylindrical pillar and adjusting the laying accuracy, placing concrete in the gap of the opening, In the embedded column base method of integrating the cylindrical column and the foundation,
A step of constructing by embedding anchor bolts in a central portion at a planned construction position of the cylindrical column during construction of the foundation, and
A plate-like base plate having a through-hole through which the anchor bolt is inserted in a central portion and a screw hole for a bolt provided in a corner of the lower surface in a column base of the cylindrical column, and the screw hole An adjustment bolt that is screwed to the head, and a long adjustment rod that is positioned above the upper surface of the base portion when the head is erected and fitted to the head of the adjustment bolt. A construction jig comprising a band member that rotatably supports the adjustment rod and is fixed around the column base is prepared, the base plate is attached to the lower end surface of the column base, and the adjustment rod is attached to the adjustment bolt. Mounting the band member rotatably supported in a state fitted to the head on the top of the column base;
A step of lifting and setting the cylindrical column with the building jig by lifting means and inserting the anchor bolt into the through hole in the central portion of the base plate while building the column from the column base in the opening; and
Attaching a handle to the head of the adjustment rod and rotating the adjustment bolt to perform at least vertical accuracy adjustment of level adjustment and vertical accuracy adjustment of the cylindrical column; and
A step of fixing the position of the adjusted cylindrical column with a fixing jig;
Removing the band member and the adjusting rod from the cylindrical pillar in the building jig;
Comprising the step of placing concrete in the opening,
How to build a cylindrical pillar characterized by There is a level adjustment nut on the top of the anchor bolt.
The method for constructing a cylindrical column according to claim 2. A flat base plate having a through-hole through which an anchor bolt is inserted at the center and provided with screw holes for bolts at corners of the lower surface;
An adjustment bolt screwed into the bolt screw hole;
A long adjustment rod that is positioned above the upper surface of the base when the head is erected by fitting and rotating the head of the adjustment bolt, and
A band member that rotatably supports the adjustment rod and is fixed by being wound around a column base;
A cylindrical pillar construction jig characterized by The bolt screw hole is composed of a nut fixed by welding to the lower surface of the base plate, and a bolt through hole provided in the plate so as to communicate with the nut.
The cylindrical pillar construction jig according to claim 4.

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