JP2005171508A - Construction method of cast-in-place concrete column and position fixing jig for column main reinforcement used for it - Google Patents

Abstract

The present invention relates to a method for constructing a cast-in-place concrete column in a frame construction of a super high-rise Hi-RC building, and it is an object to make the positioning of the column main reinforcement highly accurate and facilitate the work.
A column main bar position fixing jig 1 is formed which surrounds the outer periphery of the column main bar and engages with the main bar to restrict the position thereof. After the column main bar position fixing jig 1 is mounted at a position above the end and set at a predetermined position, the column mold 9 is assembled around the column main bar position 9 and the column main bar rod is attached with the position fixing jig attached. A concrete placement chute is inserted into the column formwork from the top of the column to place concrete, and then the position fixing jig 1 is removed from the column main reinforcement rod and used for another column main reinforcement rod. The construction method.
[Selection] Figure 8

Description

  The present invention relates to a method for constructing a cast-in-place concrete column and a position fixing jig for a column main bar used in the construction method in the construction of a super high-rise building.

  In the case of the VH separation method in the construction of a super high-rise Hi-RC building, the column main reinforcement of the V (vertical) part is fixed with a wooden veneer board above the column main reinforcement when the column main reinforcement is pre-assembled. A position fixing jig (wooden template) 11 formed by drilling holes in accordance with the pitch of the column main bars is inserted and fixed, and as shown in FIG. It was inserted into the frame 9 and concrete was laid. Then, after placing concrete on the mold 9, the position fixing jig is removed upward.

As shown in FIG. 9 (B), the position fixing jig (wooden template) 11 is a flat plate having a size corresponding to the column diameter. There is provided a through hole 11a for placement through which 10 is inserted. When the placement chute 10 is inserted into the placement through hole 11a of the position fixing jig, an operator rides on a standing horse or the like and guides the insertion of the placement chute 10 by hand. Further, a lower fixing jig for column main bars and a fixing method using the same are known.
Japanese Unexamined Patent Publication No. 7-292981

  The problem to be solved is that when placing a placement chute into the placement through hole of the position fixing jig, an operator prepares an elevated work floor such as an aerial work vehicle, It is dangerous because the work efficiency is poor. The same applies when removing the position fixing jig.

  Furthermore, in the wooden position fixing jig, since it is a template when it is set on the column main reinforcement, it is difficult to insert the uneven column main reinforcement through the through hole and push it downward. It will be set. Accordingly, when concrete is placed on the column formwork, the restraint force of the column main reinforcement is weak, so that the column main reinforcement is pushed by the concrete and the position accuracy of the column main reinforcement is deteriorated near the upper part of the formwork. Thus, there is a problem that the position accuracy of the column main bars at the position of the joint with the beam main bars cannot be maintained with high accuracy. In addition, even if it is attempted to remove the position fixing jig after placing the concrete, it is difficult to remove it by tightening it by the pillar main bar and moving it upward, and there is a case where it is unavoidable to destroy it. There is.

The gist of the construction method of the cast-in-place concrete column according to the present invention is to form a column main bar position fixing jig that surrounds the outer periphery of the column main bar and engages with the column main bar to restrict the position thereof. In the column main reinforcement bar that has the main bar pre-assembled, the column main bar position fixing jig or the diverted column main bar position fixing jig is attached from the outside at a position higher than the top end of the column mold to be placed later, After setting the column main reinforcement bar at a predetermined column construction position, a column mold is assembled with a necessary gap around the column main reinforcement bar, and the position fixing jig is attached to the upper part of the column main reinforcement bar. A concrete placement chute is inserted into the column formwork to place concrete, and then the position fixing jig is removed from the column main reinforcement rod and diverted to another column main reinforcement rod in the pre-assembled yard. .
Further, in order to attach the column main bar position fixing jig around the outer side of the column main bar rod, the four flat plates constituting the position fixing jig are connected in advance by pin-bonding their end portions to each other, Only one non-bonded portion is provided, and this position fixing jig is surrounded by turning the column main reinforcement rod from the outside, and the non-bonded portion is pin-coupled.

The gist of the column main bar position fixing jig according to the present invention is a column main bar position fixing jig which surrounds the outer periphery of the column main bar and engages with the column main bar to regulate the position thereof. An arcuate engagement edge that engages with a part of the outer periphery of the column main bars arranged at the four corners of the column main bars and the adjacent flat plate are pin-coupled to both ends in the longitudinal direction of the body. Through-holes are provided, and an engagement edge that engages with a part of the outer periphery of the columnar main bar is provided at the inner edge of the center in the longitudinal direction of the flat plate, and the center in the longitudinal direction of the flat plate An engagement edge portion that engages with a part of the outer periphery of the column main reinforcement is provided at the inner edge portion of the portion, and a pin is inserted into the through hole of the adjacent flat plate body and is coupled with the pin. is there.
Further, the arcuate engagement edges and the through holes provided at both ends of the flat plate body correspond to the changed arrangement of the column main bars when the column diameter changes, and are arranged at the four corners of the column main bars. This includes that a plurality of sets of engaging edge portions and through holes are provided so that the position restriction of the arranged columnar main bars can be varied.

According to the construction method of the cast-in-place concrete column according to the present invention, the position fixing jig for the column main reinforcement does not swell outward even if the concrete is placed in the column formwork. Since the mounting position of the fixing jig is the upper position near the top of the column mold (upper position about 300 to 500 mm from the top position), the restraint force against the column main reinforcement is strong, and the position of the column main reinforcement is maintained with high accuracy. Is done.
Since the position fixing jig is attached to the column main reinforcement bar from the outside, it is easy to attach and remove.
Moreover, since the position fixing jig exists only outside the column main reinforcement rod, it does not interfere with the concrete placement chute being inserted into the column mold frame. Therefore, the operator does not need to work at a high place for the guide in the work of inserting the placement chute into the column formwork.
Further, in order to attach the column main bar position fixing jig around the outer side of the column main bar rod, the four flat plates constituting the position fixing jig are connected in advance by pin-bonding their ends to each other. By providing a non-bonded portion only at a location, and rotating the column fixing bar from the outside to surround the position fixing jig so as to pin-couple the non-bonded portion, the work of surrounding and attaching is accelerated.

  According to the column main bar position fixing jig according to the present invention, the column main bar of the column main bar can be surrounded from the outside. Further, a plurality of sets of engagement edge portions and through holes are prepared in advance in accordance with the change in the column diameter, and the column main reinforcement rods can be surrounded by changing the size of the position restriction.

By the construction method of the on-site concrete column according to the present invention and the position fixing jig for the column main reinforcement
The position accuracy of the column main reinforcement is improved. In addition, the operator's work at high places is eliminated, and safety is improved. Furthermore, the work for attaching and detaching the position fixing jig becomes easy and efficient. Even if the column diameter changes, it can be easily handled with one kind of position fixing jig.

  The construction method of the on-situ concrete column according to the present invention and the position fixing jig for the column main reinforcement used for the method will be described. In order to facilitate understanding of the invention, portions corresponding to the conventional example will be described with the same reference numerals as those of the conventional example.

  As shown in FIG. 1, the column main bar position fixing jig 1 according to the present invention is a combination of flat plates 1 a made of metal (for example, steel). As an example of the flat plate 1a, the thickness t is about 4.5 mm, the length is about 700 to 800 mm, and the width is about 65 mm. Four sheets of this flat body 1a are prepared so as to surround the column main bars in the rectangular column.

  At both ends of the flat plate 1a, an arcuate engagement edge 1b to be engaged with a part of the outer periphery of the column main bars arranged at the four corners of the column to be constructed, and the adjacent flat plate 1a are pinned A through hole 1c for coupling is provided.

  The engaging edge portion 1b is engaged with, for example, a part of a column main bar having a circular cross section. Usually, the column main bar is a deformed reinforcing bar having a node, and therefore the outer diameter of the column main bar is set. Also set the position. Further, the pin insertion through-hole 1c is a set, and, for example, an engagement edge a and a through-hole d, an engagement edge b and a through-hole e in order to cope with changes in the column diameter. , 3 sets of engagement edge portion c and through hole f are prepared at both ends of the flat plate 1a. Thereby, for example, in one super-high-rise Hi-RC building, it becomes possible to easily cope with the case where the column diameter changes in three stages of 950 mm, 900 mm, and 850 mm as it progresses to the upper floor.

  The engagement edge portion 1b is formed in an arc shape in accordance with the shape of the columnar main bars as an example, but is not limited thereto, and may be an arc shape of a part of an ellipse as shown in FIG. As shown in (C), it may be V-shaped, or as shown in FIG. In addition, the three types of arcuate engagement edges a, b, and c are formed continuously, but may be separated from each other in some cases. Furthermore, the engagement edge portion 1b and the through hole 1c may be set as a set, and three or more sets may be provided so as to be able to cope with various types of column diameters.

  On the inner edge of the central part in the longitudinal direction of the flat plate 1a, there are provided four semicircular arc-shaped engagement edges 1d that engage with a part of the outer periphery of the columnar main bars at substantially equal intervals. . Thereby, column main bars other than the column main bars arranged at the four corners of the column are covered from the outside to regulate the position.

  As shown in FIG. 2, the detachable pin 2 to be inserted into the through hole 1c in the flat plate 1a is fixed at a position slightly lower than the pin main body 2a having a circular rod shape and the pin body 2a. A washer 2b as a part, and a movable part 2c supported so as to be swingable so as to be immersed in the pin main body 2a, and urged so that one end side thereof protrudes outward to become a triangular hooking claw. It consists of

  As shown in FIG. 3, the columnar bar position fixing jig 1 aligns and overlaps the through holes 1c between the ends of the adjacent flat plate bodies 1a, and lowers the pin 2 in the through holes 1c and 1c. Are connected to each other. In addition, as shown in FIG. 3, it connects with the pin 2 in three places, and the remaining one place is connected with the pin 2 when it is surrounded by the column main reinforcement rod.

  In this column main bar position fixing jig 1, the relationship between the engagement edge 1b and the through hole 1c is as shown in FIGS. 4A and 5 when the column diameter is 850 mm, depending on the column diameter. As shown in FIG. 4, the column main bars 4 and the hoop bars 5 at the four corners are arranged with a necessary cover thickness with respect to the column 3 and the engaging edge of the flat plate 1a is engaged with the column main bars 4. One set of the part c and the through hole f is used. Since four flat plates 1a are used, as shown in FIG. 4 (A), at one corner, the corner of the column 3 and the center G of the column main reinforcement 4 at the corner are diagonal points. The through-hole c is provided at an arbitrary position on a diagonal line that is a square (92 × 92 mm) and connects the diagonal points. If it does in this way, as shown in FIG. 5 using the same flat body 1a, both engagement edge parts c and c are arrange | positioned symmetrically with respect to a diagonal, and it engages with the column main reinforcement 4 Become.

  When the column diameter is 900 mm, as shown in FIG. 4B and FIG. 6, a set of the engagement edge b of the flat plate 1 a and the through hole e is used. Similar to the above, the through hole e is provided on a diagonal line of a square (98 × 98 mm).

  When the column diameter is 950 mm, as shown in FIG. 4 (C) and FIG. 7, a set of the engagement edge a of the flat plate 1a and the through hole d is used. Similarly to the above, the through hole d is provided on a diagonal line of a square (102 × 102 mm).

Thus, as an example, a method for constructing a cast-in-place concrete column using the column main bar position fixing jig 1 that can correspond to three types of column diameters will be described with reference to FIG.
As shown in Step 1 in the figure, in the columnar tip assembly yard, a columnar tip assembly stage 6 is constructed at a height of two steps, and a wooden fixing pedestal template 7 is used at the foot, Perform the main group first group. Thereby, the column main reinforcement 8 is formed.

  On the other hand, in step 2, the column main reinforcement rod 8 is set and the column mold 9 is assembled. The column main reinforcement bar 8 is provided with the column main bar position fixing jig (indicated as a steel template in the drawing) 1 at an upper position (about 500 mm) from the top of the column mold 9. With the position fixing jig 1 attached, the concrete placing chute 10 is inserted into the column form frame 9 from the upper part of the column main reinforcement rod 8 to place concrete.

  Thereafter, the column main reinforcement fixing jig 1 is removed from the column main reinforcement rod 8 by removing the pin 2 from one of the four pin coupling portions.

  Next, as shown in Step 3, the removed column main bar fixing jig 1 is positioned above the top end of the column form frame 9 to be placed later on the column main bar bar 8 of the column bar front assembly yard. (Approx. 500mm), attach from outside and divert. For this attachment, the column main bar position fixing jig 1 and the four flat plates 1a constituting the position fixing jig 1 are connected in advance by pin-bonding their ends to each other with pins 2. Only non-bonded portions are provided (see FIG. 3), and an operator rides on the upper stage of the column reinforcement tip assembly stage 6 and turns the column main reinforcement rod 8 from the outside to surround it. It is to be connected with a pin.

  Next, as shown in step 4, the beam / slab bar arrangement is performed, and the column main reinforcement bar 8 attached with the column main bar position fixing jig 1 is lifted by a transportation means such as a crane, and the column position of the construction floor Transport to. And the said column main reinforcement rod 8 is set to a column and beam junction part. Then, floor topping concrete is laid. And it returns to the said process 1 and is repeated.

  The four flat plates 1a in the column main bar position fixing jig 1 are the same. However, the present invention is not limited to this, and the two types of flat plates facing each other in the rectangular shape are the same. It is good also as a flat body. In short, as shown in FIG. 3, the flat plate is pin-coupled and folds inwardly and outwardly so that it can be swung freely. It only needs to be able to let go. The column main reinforcing bar position fixing jig 1 has been described with respect to a rectangular column. However, the column main bar position fixing jig 1 can also be applied by pin coupling in the same manner in the case of a circular column or other columns. is there.

It is a top view (A) of the flat plate 1a of the position fixing jig 1 for column main bars according to the present invention, and is a plan view of the same part (B), (C), (D) showing a modification of the engaging edge 1b. It is. It is a front view of the pin 2 used for the position fixing jig 1 for column main bars of the same invention. It is explanatory drawing explaining the use condition of the position fixing jig 1 for column main bars which concerns on the same invention. It is. It is explanatory drawing (A), (B), (C) which shows a mode that the engagement edge part 1b and the through-hole 1c of the flat plate body 1a engage with the column main reinforcement 4 in three types of column diameters. It is a top view of the state which made the column main reinforcement rod 8 in the case where the column diameter is 850 mm surround the same column main reinforcement position fixing jig 1 from the outside. It is the top view of the state which made the column main reinforcement rod 8 in the case where the column diameter is 900 mm surround the same column main reinforcement position fixing jig 1 from the outside. It is the top view of the state which made the column main reinforcement rod 8 in the case where the column diameter is 950 mm surround the same column main reinforcement position fixing jig 1 from the outside. It is explanatory drawing which shows the construction method of the cast-in-place concrete pillar which concerns on this invention. It is explanatory drawing (A) which shows the construction method of the cast-in-place concrete pillar which concerns on a prior art example, and the perspective view (B) of the wooden template 11. FIG.

Explanation of symbols

1 Column main bar position fixing jig (steel template),
1a flat plate,
1b engagement edge, 1c through-hole,
1d engagement edge,
2 pin, 2a pin body,
2b washer, 2c movable part,
3 pillars,
4 Column mains,
5 Hoop,
6 Column reinforcement group stage,
7 Fixed pedestal template,
8 Pillar main muscles,
9 Column formwork,
10 Concrete placement chute,
11 Wooden template.

Claims (4)

Form a column main bar position fixing jig that surrounds the outer periphery of the column main bar and engages with the column main bar to regulate its position,
In the column main reinforcement rods that have the column main bars pre-arranged, the column main bar position fixing jig or the diverted column main bar position fixing jig is arranged from the outside at a position above the top end of the column mold to be placed later. Installation,
After setting the column main stirrup to a predetermined column construction position,
Assembling the column form with a necessary gap around the column main reinforcement,
Inserting a concrete placement chute into the pillar formwork from the top of the column main reinforcement with the position fixing jig attached, placing concrete,
Then, removing the position fixing jig from the column main reinforcement rod and diverting it to another column main reinforcement rod in the pre-assembled yard,
Construction method of on-site concrete columns characterized by In order to attach the column main bar position fixing jig to the outer periphery of the column main bar rod, the four flat plates constituting the position fixing jig are connected in advance by pin-bonding their end portions to each other, and only at one place. An unbonded portion is provided, and this position fixing jig is turned around from the outside to the column main reinforcement rod, and the unbonded portion is pin-coupled,
The construction method of the spot cast-in-place concrete pillar of Claim 1 characterized by these. A column main bar position fixing jig that surrounds the outer periphery of the column main bar and engages with the column main bar to restrict the position thereof, and is provided at both ends in the longitudinal direction of the elongated flat plate, An arcuate engagement edge that engages with a part of the outer periphery of the columnar bars arranged at the four corners, and a through hole for pin-connecting the adjacent flat plates are provided in the longitudinal direction of the flat plate An engagement edge that engages with a part of the outer periphery of the column main reinforcement is provided on the inner edge of the central portion, and a pin is inserted into the through hole of the adjacent flat plate and is connected to the pin. ,
This is a position fixing jig for column main bars. The arcuate engagement edges and through-holes provided at both ends of the flat plate are arranged at the four corners of the column main bars corresponding to the changed arrangement of the column main bars when the column diameter changes. A plurality of sets of engaging edges and through-holes are provided so that the position regulation of the columnar bars can be varied;
The position fixing jig for column main bars according to claim 3.

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