JP2016075110A - Column installation method and column installation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a column installation method and a column installation structure that enhances positional accuracy of a column relative to a foundation part.SOLUTION: In a column installation method, a PC column 10 is inserted into a hole formed on a foundation part 2 from above, and grout G and mortar are cast between the PC column 10 and the foundation part 2 for integrating the PC column 10 with the foundation part 2. The column installation method comprises the following steps for: embedding a positioning member 5 into a bottom 2d of an opening, with a head part 5a of the positioning member 5 exposed, the positioning member being for positioning the PC column 10 with regard to the foundation part 2; positioning a guide pin 4 with regard to the opening and fixing the guide pin 4 on the head part 5a of the positioning member 5 embedded at the bottom 2d of the opening; and erecting the PC column 10 by lowering the PC column 10 into the opening, in such a way to have the guide pin 4 inserted from below into a hole part 10b formed on an edge surface 10d on one side of the PC column 10, after fixing the guide pin 4.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a column installation method and a column installation structure in which a column having a hollow section is installed on foundation concrete.

  Japanese Patent Application Laid-Open No. 2007-270431 describes a construction method in which a precast concrete column (hereinafter referred to as a PC column) manufactured in advance at a factory is built in a box opening formed in basic concrete. . In this construction method, a dedicated construction jig is used. The construction jig includes a base plate having a through hole into which an anchor bolt embedded in an opening of the foundation concrete is inserted, and an adjustment bolt screwed into a screw hole formed in the base plate from above. In this construction jig, the base plate is attached to the lower end of the PC column, the PC column is installed, the anchor bolt is inserted into the through hole of the base plate, and then the adjustment bolt is rotated from above, thereby The vertical position is adjusted.

  Japanese Patent Application Laid-Open No. 2000-73443 describes a method of installing a column using a component (hereinafter referred to as an iron dango) that performs load support of the steel column and level adjustment of the steel column. In this method, an iron dango with a spherical upper end is embedded in the opening of the foundation concrete, and a steel material with a spherical depression is attached to the lower end of the column. The position of the column relative to the foundation concrete is adjusted by fitting the in the hollow of the steel material.

JP 2007-270431 A JP 2000-73443 A

  In the column installation method as described above, a positioning member for positioning the column, such as an anchor bolt or an iron dango, needs to be embedded in the base portion in advance. Since the operation of embedding the positioning member in the base portion is performed by placing concrete, the position of the positioning member may be shifted with the placement of concrete. If the position of the positioning member is shifted, the position of the column to be installed is also shifted. Therefore, in the column installation method as described above, there is room for improvement in the column position accuracy with respect to the foundation.

  An object of the present invention is to provide a column installation method and a column installation structure capable of increasing the positional accuracy of the column with respect to the foundation.

  In the column installation method according to the present invention, the column is inserted into the opening formed in the base portion from above, and a hardening material is placed in the gap between the column and the base portion to integrate the column and the base portion. In the column installation method, the step of embedding the positioning member in the bottom of the opening and the alignment of the guide pin with respect to the opening are performed with the upper part of the positioning member for positioning the column relative to the base exposed. A step of fixing the guide pin to the upper part of the positioning member embedded in the bottom of the opening, and after fixing the guide pin, the guide pin is inserted from below into the hole formed in one end surface of the column And a step of building the pillar by lowering the pillar into the opening.

  In the column installation method according to the present invention, the positioning member is embedded in the bottom of the opening, and then the guide pin is fixed to the top of the positioning member, and then inserted into the hole of the column from below. Build in. Therefore, even if the position of the positioning member with respect to the base portion is shifted, the position of the pillar can be set to the correct position by the guide pin that has been aligned and fixed later. Since the guide pin is fixed to the positioning member after the concrete is placed, the position of the guide pin is not shifted by the concrete placement. Therefore, the position accuracy of the column with respect to the foundation can be increased by inserting the hole of the column into the guide pin fixed later. Further, since the pillar can be built by simply inserting the guide pin into the hole of the pillar, the pillar can be installed smoothly.

  The method further includes a step of arranging a winding pipe into which the pillar is inserted before embedding the positioning member. The opening is formed by placing concrete around the winding pipe, and the positioning member is made of concrete. It may be embedded inside the winding pipe as it is driven. By arranging the winding pipe into which the pillar is inserted in this way and embedding the positioning member inside the winding pipe, the position of the pillar with respect to the base portion can be determined by the winding pipe. Therefore, the positional accuracy of the pillar can be further increased. In addition, since it is possible to determine the position of the pillar simply by inserting the pillar into the winding pipe, it is possible to easily perform the installation work of the pillar with respect to the base portion.

  In addition, a bottom plate having an insertion hole for inserting a positioning member is fixed to the lower end of the winding pipe. The positioning member includes an insertion portion that is inserted into the insertion hole from above and a flange that is positioned above the insertion portion. And a step of fixing the positioning member to the bottom plate by inserting the insertion portion into the insertion hole and fixing the flange portion to the upper surface of the bottom plate before embedding the positioning member. In this case, the positioning member is embedded after the insertion portion of the positioning member is inserted into the insertion hole from above and the positioning member is fixed to the bottom plate. Therefore, since the positioning member is embedded while being fixed to the bottom plate, the position of the positioning member can be made difficult to shift. Therefore, the positional accuracy of the column with respect to the foundation can be further increased.

  In the pillar installation structure according to the present invention, the pillar is inserted into the opening formed in the base portion from above, and a hardening material is placed in the gap between the pillar and the base portion so that the pillar and the base portion are integrated. In the pillar installation structure, the positioning member embedded in the bottom of the opening with the top exposed, and the top of the positioning member embedded in the bottom of the opening after being aligned with the opening And a guide pin fixed to the column, and the column is built by dropping the column into the opening so that the guide pin is inserted from below into a hole formed in one end surface of the column. .

  In the pillar installation structure according to the present invention, the positioning member is embedded in the bottom of the opening with the upper part exposed, and the guide pin is fixed to the upper part of the embedded positioning member, and then guided to the hole of the pillar. A pin is inserted. Therefore, even if the position of the positioning member is shifted, the position of the column is set to the correct position by the guide pin fixed to the upper part of the positioning member. As described above, the guide pin aligned with the upper portion of the embedded positioning member is fixed, and this guide pin is inserted into the hole of the column, so that the column installation structure with improved positional accuracy with respect to the base portion It can be.

  ADVANTAGE OF THE INVENTION According to this invention, the position accuracy of the column with respect to a base part can be improved.

It is sectional drawing which shows the installation structure of the pillar which concerns on one Embodiment. It is sectional drawing which shows the bottom part of the pillar, the positioning member, and guide pin in the installation structure of FIG. It is the perspective view which looked at the winding pipe from the upper part. It is a perspective view which shows a winding pipe and a leg part. It is a perspective view which shows the positioning member and guide pin in a winding pipe. It is a side view which shows a positioning member. It is a perspective view which shows the state which has arrange | positioned the winding pipe. It is a perspective view which shows the state which performed the basic reinforcement to the winding pipe of FIG. It is a perspective view which shows a base part. It is a top view which shows the basic part of FIG. It is a perspective view which shows the state which put the wooden camber in the opening part.

  Hereinafter, an embodiment of a column installation method and a column installation structure according to the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 1 and FIG. 2, the column installation structure 1 according to this embodiment is configured such that a columnar PC column 10 is installed on a foundation portion 2 made of concrete C, and the PC column 10 is a foundation portion. 2 is an integrated structure. The PC pillar 10 is a concrete pillar manufactured in advance in a factory. A bottom plate 10a is provided at one end of the PC pillar 10, and a circular hole 10b is formed at the center of the bottom plate 10a. The hole 10 b is formed in one end surface 10 d of the PC pillar 10. The PC pillar 10 is manufactured, for example, by centrifugal molding, and has a hollow cross section.

  The foundation 2 includes a ground improvement pile 2a provided to increase the strength of the ground, a base 2b formed of concrete C provided on the top of the ground improvement pile 2a, and a circular shape formed at the upper end of the base 2b. The opening 2c is provided. The PC pillar 10 is inserted into the opening 2c from above. Specifically, the opening 2 c is formed by the winding pipe 3, and the PC pillar 10 is inserted inside the winding pipe 3. In the opening 2c, the winding pipe 3 and the PC pillar 10 are fixed by a grout (hardening material) G and a mortar (hardening material) M. The grout G is injected below the bottom plate 10 a of the PC column 10, and the mortar M is injected between the side surface of the PC column 10 and the inner peripheral surface of the winding pipe 3.

  As shown in FIGS. 2 to 4, the winding pipe 3 has a cylindrical shape, and irregularities are arranged in parallel in the axial direction of the winding pipe 3. A disc-shaped bottom plate 31 is fixed to one end of the winding pipe 3, and the bottom plate 31 is provided so as to close one end of the winding pipe 3. The bottom plate 31 is fixed to the winding pipe 3 by welding, for example. A through hole 31 a that penetrates in the axial direction of the winding pipe 3 is formed in the center of the bottom plate 31. The through hole 31a is an insertion hole into which the positioning member 5 is inserted. The diameter of the through hole 31a is, for example, about 60 mm.

  Four legs 32 that support the winding pipe 3 with the bottom plate 31 facing downward are attached to the outer periphery of the winding pipe 3. The legs 32 are arranged at equal intervals in the circumferential direction of the winding pipe 3. The leg 32 is attached to the outer periphery of the winding pipe 3 and extends to the lower side of the winding pipe 3, and the leg 32 is bent in an L shape at the lower end of the extension part 32 a and placed on the ground. The mounting portion 32b and a brace 32c that diagonally spans the two extending portions 32a are provided. Further, the leg 32 is attached to the winding pipe 3 by fixing the extending portions 32 a to several places on the outer periphery of the winding pipe 3 by spot welding.

  As shown in FIG. 2, the guide pin 4 is inserted into the hole 10 b of the bottom plate 10 a of the PC pillar 10 from below. Moreover, since the taper surface 10c which inclines radially outward as it goes below is provided under the hole 10b, it is easy to insert the guide pin 4 from under the hole 10b.

  As shown in FIGS. 2 and 5, the guide pin 4 is fixed to the upper part of the positioning member 5 embedded in the bottom 2d of the opening 2c. The guide pin 4 is fixed to the positioning member 5 by welding, for example. The guide pin 4 is a cylindrical member and is made of metal. The guide pin 4 is inserted into the hole 10b of the PC pillar 10 from below. By inserting the guide pin 4 into the hole 10b, the position of the PC pillar 10 on the horizontal plane can be set to the correct position.

  As shown in FIGS. 2, 5, and 6, the positioning member 5 includes a bolt-shaped head portion 5a to which the guide pin 4 is fixed, a screw portion 5b positioned below the head portion 5a, and a screw portion 5b. Are provided with a screw cylinder part 5c to be screwed from above, a flange part 5d located at the lower part of the screw cylinder part 5c, and a columnar insertion part 5e extending downward from the flange part 5d. The flange portion 5d extends at the top of the insertion portion 5e. The insertion part 5e is inserted into the through hole 31a of the winding pipe 3 from above.

  The positioning member 5 can adjust the vertical position of the PC pillar 10 and is also called an iron dango. The positioning member 5 is embedded in the bottom 2d of the opening 2c with the head 5a located at the top thereof exposed. In the positioning member 5, since the head 5a and the screw part 5b move up and down with respect to the screw cylinder part 5c by rotating the head 5a, the vertical position of the head 5a can be easily adjusted.

  Next, a column installation method according to this embodiment will be described. This installation method is used when the PC pillar 10 is integrated with the base portion 2 by using the winding pipe 3, the guide pin 4, and the positioning member 5 described above. Moreover, this installation method is used also in the frame structure of the mixed structure comprised by the PC pillar 10 and an H-shaped steel beam, for example. First, a through hole 31a is formed in the center of the bottom plate 31, and the bottom plate 31 is fixed to one end of the winding pipe 3 by welding. Then, four legs 32 are attached to the winding pipe 3. The fixing of the bottom plate 31 and the attachment of the four legs 32 are performed at a factory, for example. In this case, the winding pipe 3 to which the bottom plate 31 and the legs 32 are fixed is transported to the site.

  Then, the process of arrange | positioning the winding pipe 3 is performed. First, the winding pipe 3 (PC column 10) is positioned with respect to the foundation 2 to be created. As shown in FIG. 7, the core of the PC pillar 10 is marked on the top of the discarded concrete S cast on the ground, and the mounting portions 32 b of the legs 32 are mounted on the top of the discarded concrete S.

  Next, a step of fixing the positioning member 5 to the bottom plate 31 of the winding pipe 3 is performed. Specifically, as shown in FIGS. 2 and 5, the insertion portion 5 e of the positioning member 5 is inserted into the through hole 31 a of the bottom plate 31 fixed to the winding pipe 3 from above, and the positioning member is placed on the upper surface of the bottom plate 31. The lower surface of the flange portion 5d of 5 is hooked. Then, in order to prevent the positioning member 5 from being displaced with respect to the winding pipe 3, the flange portion 5d is fixed to the bottom plate 31, for example, by spot welding.

  Next, as shown in FIG. 8, the reinforcing bars 2e constituting the base 2b of the base portion 2 are arranged. Then, a mold (not shown) is built around the reinforcing bar 2e, and then concrete C is placed inside the mold and around the winding pipe 3 as shown in FIGS. The concrete C is placed carefully so that the position of the winding pipe 3 does not shift.

  At this time, a step of embedding the positioning member 5 in the bottom 2d of the opening 2c is performed. That is, with the placement of the concrete C, the legs 32 that support the winding pipe 3 are embedded in the concrete C. The concrete C reaches the lower part of the bottom plate 31 and the insertion portion 5e of the positioning member 5 is embedded. (See FIG. 2). Thus, the step of embedding the positioning member 5 in the bottom 2d of the opening 2c is completed.

  When the concrete C is placed as described above, the upper portion of the positioning member 5 is exposed inside the winding pipe 3 as shown in FIGS. 5, 9, and 10. That is, the top surfaces of the head portion 5a, the screw portion 5b, the screw cylinder portion 5c, and the flange portion 5d of the positioning member 5 are exposed. In this state, a step of fixing the guide pins 4 is performed. Specifically, the core of the PC pillar 10 is drawn on the head 5 a of the positioning member 5. And the installation height of the PC pillar 10 is adjusted by rotating the head 5a and adjusting the height of the head 5a. After adjusting the height of the head 5 a of the positioning member 5, the guide pin 4 is welded and fixed to the head 5 a in accordance with the core of the PC pillar 10. That is, the guide pin 4 is aligned with the opening 2c to fix the guide pin 4 to the head 5a. Thus, the process of fixing the guide pin 4 is completed.

  Next, a step of building the PC pillar 10 is executed. Specifically, the PC pillar 10 is lifted by a lifting machine such as a crane, and the PC pillar 10 is inserted into the winding pipe 3 from above with the bottom 10a of the PC pillar 10 facing downward. Then, as shown in FIG. 2, the PC pillar 10 is installed by lowering the PC pillar 10 into the opening 2 c so that the guide pin 4 is inserted into the hole 10 b of the PC pillar 10 from below.

  In the installation of the PC pillar 10, the inclination of the PC pillar 10 with respect to the opening 2c is adjusted as shown in FIG. At this time, the PC pillar 10 is temporarily fixed by inserting a plurality of wooden cambers W into the opening 2c. By inserting the wooden camber W into the opening 2c in this way, a space K (a gap between the PC column 10 and the base portion 2) can be easily secured on the outer periphery of the PC column 10, and the PC column 10 It is possible to quickly perform the construction work.

  After temporarily fixing the PC pillar 10 with the wooden camber W, the grout G is injected into the space K from above, and the grout G is filled between the bottom plate 10 a of the PC pillar 10 and the bottom plate 31 of the winding pipe 3. Then, the mortar M is filled between the side surface of the PC pillar 10 and the inner peripheral surface of the winding pipe 3 by injecting the mortar M into the space K from above. By hardening the mortar M, the PC pillar 10 is firmly integrated with the base portion 2. In this way, the process of building the PC pillar 10 is completed.

  As described above, in the column installation method and the column installation structure according to the present embodiment, the positioning member 5 is embedded in the bottom 2d of the opening 2c with the head 5a of the positioning member 5 exposed. After that, the guide pin 4 is aligned to fix the guide pin 4 to the head 5a, and then the guide pin 4 is inserted into the hole 10b of the PC pillar 10 from below to erection the PC pillar 10. . Therefore, even if the position of the positioning member 5 with respect to the base portion 2 is shifted, the position of the PC pillar 10 can be set to the correct position by the guide pin 4 that is aligned and fixed later. Moreover, since the guide pin 4 is fixed to the positioning member 5 after the concrete C is placed, the position of the guide pin 4 is not shifted by the concrete C placement. Therefore, by inserting the hole 10b of the PC pillar 10 into the guide pin 4 that has been aligned after the concrete C is placed, the positional accuracy of the PC pillar 10 with respect to the foundation 2 can be increased. Furthermore, since the PC pillar 10 can be built simply by inserting the guide pin 4 into the hole 10b, the PC pillar 10 can be installed smoothly.

  Further, by placing the winding pipe 3 into which the PC pillar 10 is inserted and embedding the positioning member 5 inside the winding pipe 3, the position of the PC pillar 10 with respect to the base portion 2 can be determined by the winding pipe 3. Therefore, the positional accuracy of the PC pillar 10 can be further increased. Further, since the position of the PC pillar 10 can be determined simply by inserting the PC pillar 10 into the winding pipe 3, the installation work of the PC pillar 10 with respect to the base portion 2 can be easily performed.

  Further, after the insertion portion 5e of the positioning member 5 is inserted into the through hole 31a of the winding pipe 3 from above and the positioning member 5 is fixed to the bottom plate 31, the positioning member 5 is embedded. Therefore, since the positioning member 5 is embedded while being fixed to the bottom plate 31, the position of the positioning member 5 can be made difficult to shift. Therefore, the positional accuracy of the PC pillar 10 with respect to the base portion 2 can be further enhanced.

  The present invention is not limited to the above-described embodiment, and various modifications as described below are possible without departing from the gist of the present invention.

  For example, in the above-described embodiment, an example in which the columnar PC column 10 is installed has been described. However, the column inserted into the opening 2c may not be columnar. For example, the present invention can be applied to a prismatic column. Further, the shape, size, and arrangement position of the hole 10b provided in the PC pillar 10 are not limited to the above embodiment and can be changed as appropriate.

  Moreover, in the said embodiment, although the opening part 2c in which the PC pillar 10 is inserted was circular shape and the winding pipe 3 was cylindrical shape, it changes suitably also about the shape and magnitude | size of the base part 2 or the winding pipe 3. Is possible. In the above embodiment, the four legs 32 are attached to the winding pipe 3, but the number and shape of the legs attached to the winding pipe 3 can be changed as appropriate.

  Moreover, although the guide pin 4 is a column-shaped member and is comprised with the metal, it can change suitably also about the shape, material, and magnitude | size of a guide pin. Further, the positioning member 5 is not limited to the above embodiment, and a positioning member different from the above embodiment can be used as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Installation structure, 2 ... Foundation part, 2a ... Ground improvement pile, 2b ... Base, 2c ... Opening part, 2d ... Bottom, 2e ... Reinforcing bar, 3 ... Winding pipe, 4 ... Guide pin, 5 ... Positioning member, 5a ... Head part, 5b ... Screw part, 5c ... Screw cylinder part, 5d ... Flange part, 5e ... Insertion part, 10 ... PC pillar (column), 10a ... Bottom plate, 10b ... Hole part, 10c ... Tapered surface, 10d ... One end face 31 ... Bottom plate, 31a ... Through hole (insertion hole), 32 ... Leg, 32a ... Extension part, 32b ... Mounting part, C ... Concrete, G ... Grout (hardening material), K ... Space, M ... Mortar ( Hardened material), S ... Concrete discarded, W ... Wooden camber.

Claims (4)

A column installation method in which a column is inserted into an opening formed in a base portion from above, and a hardening material is placed in a gap between the column and the base portion to integrate the column and the base portion. In
The step of embedding the positioning member in the bottom of the opening, with the upper part of the positioning member for positioning the column with respect to the base portion exposed.
Aligning the guide pin with respect to the opening, and fixing the guide pin to the top of the positioning member embedded in the bottom of the opening;
After fixing the guide pin, the step of lowering the column to the opening so that the guide pin is inserted from below into the hole formed in one end surface of the column, and building the column;
A pillar installation method characterized by comprising: Prior to embedding the positioning member, further comprising the step of placing a winding pipe into which the pillar is inserted,
The opening is formed by placing concrete around the winding pipe,
The positioning member is embedded inside the winding pipe as the concrete is placed.
The installation method of the pillar of Claim 1. A bottom plate having an insertion hole for inserting the positioning member is fixed to the lower end of the winding pipe,
The positioning member has an insertion portion that is inserted into the insertion hole from above, and a flange portion that is positioned above the insertion portion.
Prior to embedding the positioning member, further comprising the step of fixing the positioning member to the bottom plate by inserting the insertion portion into the insertion hole and fixing the flange portion to the upper surface of the bottom plate.
The installation method of the pillar of Claim 2. Installation of a pillar in which a pillar is inserted from above into an opening formed in the foundation, and a hardening material is placed in the gap between the pillar and the foundation to integrate the pillar and the foundation. In structure
A positioning member embedded in the bottom of the opening with the top exposed;
A guide pin that is aligned with the opening and fixed to the top of the positioning member embedded in the bottom of the opening;
A pillar installation structure characterized in that the pillar is built by lowering the pillar into the opening so that the guide pin is inserted from below into a hole formed in one end surface of the pillar.

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