JP3101163B2 - How to join columns and beams - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining at least a pair of precast concrete beam members and a concrete column member at a beam-column joint.

[0002]

2. Description of the Related Art In the construction of a reinforced concrete building using a beam member made of precast concrete, in order to make a beam and a column cross each other at a beam-column joint, a beam main body of a pair of beam members is used at the beam-column joint. One end faces of the beam members are opposed to each other, and the lower ends of both beam members are joined together in that state. Then, one end faces of the beam main portions of the other pair of beam members are opposed to each other at the beam-column joint, and in this state, both beam members are Join the lower muscles of
After that, concrete is poured into the beam-column joints.

However, since the upper surface of the column member is a complicated uneven surface having a large number of irregularities, merely placing one end of each of the beam members on the column main portion of the column member makes the upper surface of the column main portion and the beam main member inconsistent. A gap is formed between the main body and the lower surface. When concrete is poured into the beam-column joint with such a gap formed, the poured concrete is not sufficiently filled in the gap between the beam and beam, and a gap remains between the beam of the beam-column joint. .

[0004] When a gap is left between the beam and the column in the beam-column joint, a so-called overhang portion corresponding to the area of the beam member placed on the column member cannot be regarded as effective in terms of the structure of the column. It must be treated as a concrete part, resulting in a structurally smaller effective cross section of the column. If an attempt is made to increase the effective area of the column at the beam-to-column joint to prevent this, the cross-sectional area of the main column must be increased, and the column becomes unnecessarily thick.

[0005] As one method of joining a column and a beam, a gantry is attached to each side of the upper part of a quadrangular pillar-shaped column member, one end of each column member is placed on the gantry, and the ends of the four beam members are connected. It has been proposed to cast concrete into a beam-column joint formed inside (Japanese Patent Laid-Open No. 6-173339).
However, in this method, since one end of each beam member is placed on the gantry and the upper surface of the column main portion, it is inevitable that a gap remains between the column and the beam.

The above publication also discloses that a gantry is attached to each side surface of a column member such as a steel member penetrating a beam-to-column joint, and one end of each column member is placed on the gantry. It describes that concrete is poured into a beam-column joint formed inside the end. However, this method requires an auxiliary reinforcing bar and a plurality of joints for connecting the pair of beam main reinforcements, so that the number of parts and the number of joints required for the connection of the pair of beam main reinforcements increase, resulting in high cost.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to reduce the effective area of a column at a beam-column joint without increasing the thickness of the column, even though the end of the beam main portion is located within the cross section of the column. To make it bigger.

[0008]

According to the method for joining a column and a beam of the present invention, a concrete column member is formed so that a space into which concrete can enter is formed between the upper surface of the column main portion and the lower surface of the beam main portion. At each of the opposing portions of the upper side surface of the column main body, a beam receiver is attached so that the height position of the upper surface of the beam receiver is higher than the height position of the upper surface of the column main portion, and each beam receiver is made of precast concrete. One end of the beam main part of the beam member is placed with its end face above the column main part, a formwork forming at least the beam-column joint is arranged, and concrete is cast at least in the beam-column joint. Including.

[0009] The beam receiver may be formed, for example, by screwing a plurality of mounting bolts into screw holes provided in the upper portion of the pillar main portion, or by providing a plurality of anchors provided in the upper portion of the pillar main portion in advance. It is attached to the pillar main body by a bolt and an attachment nut screwed to the anchor bolt.

The beam member has one end located within the cross-sectional area of the column at the beam-column joint, and a value corresponding to the difference between the height position of the upper surface of the beam receiver and the height position of the upper surface of the column main portion. Only from the upper surface of the pillar main body. For this reason, since a large space corresponding to the difference between the height position of the upper surface of the beam receiver and the height position of the upper surface of the column main portion is formed between the upper surface of the column main portion and the lower surface of the beam main portion, The concrete poured into the beam-column joint part sufficiently enters the space between the upper surface of the column main part and the lower surface of the beam main part, and fills the space. As a result, the concrete portion between the upper surface of the column main portion and the lower surface of the beam main portion can also be regarded as an effective portion of the structural column.

As described above, according to the present invention, concrete is cast in a state where a large space is maintained between the upper surface of the column main portion and the lower surface of the beam main portion by the beam receiver. The concrete part between the upper surface of the beam and the lower surface of the beam main part can also be considered as an effective part of the structural column, and therefore, the end of the beam main part is located within the cross section of the column at the beam-column joint. Nevertheless, the effective area of the column at the beam-column joint is increased without making the column thicker.

[0012] The opposing beam main reinforcement is preferably mechanically connected to a screw grout, a screw joint, a sleeve joint or the like, welded or the like, preferably to a screw grout or a screw joint prior to placing the concrete, preferably prior to placing the formwork. And the like.

The beam receiver can be removed at any time after the cast concrete has solidified. However, depending on the type and shape of the formwork, the beam receiver may be buried and left in the concrete.

As the beam receiver, for example, a plate-shaped first portion abutting on the upper outer surface of the pillar main portion and a plate-shaped second portion extending substantially horizontally from the upper edge of the first portion A receiving member disposed on the pillar main portion, and a vertical direction formed below the height position of the second portion and formed in the first portion at an interval in the width direction of the beam main portion. And a plurality of long holes.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 4, a pair of precast concrete beam members 10 and a concrete column member 12 are joined at a beam-column joint using a pair of beam receivers 14. .

Each beam member 10 has a quadrangular prism-shaped beam main portion 16.
And a plurality of lower streaks 18 extending in parallel through the lower part of the beam main part in the longitudinal direction and a plurality of stirrup streaks 20 arranged in the beam main part 16 at intervals in the longitudinal direction. And reinforced concrete beam members.

Each lower end bar 18 is one of the beam main bars, and protrudes from both end surfaces of the beam main body 16. Beam main part 1
It is preferable that the length dimension of the protruding portion of the lower end streaks 18 from 6 is a length dimension that allows the lower end streaks 18 of the opposing beam members to be connected to each other at the beam-column joint. The beam main body 16 may have a groove that opens on the upper surface and extends in the longitudinal direction. Most of the stirrup streaks 20 are embedded in the beam main body 16 such that a part thereof projects upward from the beam main body 16.

The column member 12 includes a quadrangular column-shaped main column 22 made of concrete, a plurality of column main bars 24 extending vertically from the column main column, and projecting further upward from the column main column 22. It is a reinforced concrete column member including a plurality of hoop bars (not shown) embedded in the main body 22 at intervals in the direction. Each column main bar 24 extends beyond the column-beam joint and the height position 26 of the upper floor slab.

After arranging the plurality of lower reinforcements 18 in a predetermined form in a predetermined state, the beam member 10 is poured concrete into the form to a level at which the upper portion of each stirrup 20 protrudes by a predetermined amount. , By solidification. The column member 12 may be made of precast concrete or cast-in-place concrete.

As shown in FIGS. 2 and 3, each beam receiver 14 has a receiving member 30 disposed on the column main body 22. The receiving member 30 includes an elongated plate-shaped first portion 32 abutting on the upper outer surface of the column main body portion 22 and an elongated plate-shaped second portion extending substantially horizontally from an upper edge of the first portion. 3
4 and an elongated plate-shaped third portion 36 extending substantially horizontally from the lower edge of the first portion 32 to the same side as the second portion 34.

The receiving member 30 has a substantially U-shaped cross-sectional shape by the first, second and third portions 32, 34, and 36, and has ribs 38 at a plurality of longitudinally spaced portions. It is reinforced by.

The beam receiver 14 is also provided with the second
A plurality of holes 40 formed in the first portion 32 at intervals in the width direction of the receiving member 30; a plurality of long holes 42 formed in the first portion 32 at intervals in the width direction. Part 3
4, a plurality of nuts 44, a bolt 46 screwed to each nut 44 from the lower side of the second portion 34,
A thin plate 48 disposed at the upper end of each bolt 46.

Each hole 40 penetrates the second portion 34 in the vertical direction. Each of the long holes 42 is, of the first portion 32,
It penetrates a portion below the height position of the second portion 34, and is long in the vertical direction. Each plate 48 is rotatably attached to the tip of a bolt 46. The plate 48 is for preventing the beam member 10 from being damaged by the tip of the bolt 46, and therefore may be provided on the beam member 10 or may not be provided with the plate 48.

Each nut 44 corresponds to the hole 40 and is fixed to the lower surface of the second portion 34 by welding or the like such that the axis coincides with the axis of the corresponding hole 40. For this reason, the female screw hole of each nut 44 functions as a through hole vertically penetrating the second portion 34 together with the hole 40, and also functions as a female screw portion of the through hole. However, instead of providing the nut 44, the hole 40 itself may be a screw hole, or a female screw may be formed in a part of the hole 40.

The beam receiver 14 is formed by passing bolts 50 for mounting through the elongated holes 42 and threading the bolts 50 on the upper side surface of the column main body 22 at predetermined intervals in the width direction of the beam member 10. By being screwed to 52, it is attached to the column main body 22 so as to extend in the horizontal direction. Each screw hole 52
Can be formed by embedding a female screw member such as a screw bush in the column main body 22.

When the pair of beam members 10 are joined at the beam-column joint, a pair of beam receivers 14 are attached to opposing side surfaces of the column main body 22. At this time, each beam receiver 14 moves the receiving member 30 in the vertical direction with respect to the mounting bolt 50 to adjust the tightening position of the mounting bolt 50 with respect to the elongated hole 42, so that the upper surface of the receiving member 30 is mainly composed of columns. The height position is adjusted so as to be sufficiently above the upper end of the part 22.

The pair of beam members 10 to be joined has one end of the beam main portion 16 placed on a beam receiver 14 arranged opposite to the upper outer surface of the column main portion 22. The other end of each beam member 10 is placed on a beam receiver provided on another column member. Each beam receiver 14 receives the lower surface of the beam member 10 on a plate 48 at the upper end of a bolt 46 for height adjustment. At this time, each beam member 10 is set so that the end face of the beam main part 16 enters the cross-sectional area of the column in the beam-column joint, that is, the end face of the beam main part 16 is located above the column main part 22. It is placed on the beam receiver 14. However, the other end of the beam member 10 may be supported by a column or the like.

In the above state, each bolt 46 for height adjustment
The height of the beam member 10 is adjusted so that the axes of the lower streaks 18 to be joined coincide with each other by adjusting the screwing amount of the lower end streaks 18. Are connected in a one-to-one manner by a mechanical joint 54. In this way, with the axes of the lower streaks 18 to be joined aligned, the lower streaks 18 are connected to the mechanical joint 5.
If the connection is made by 4, the lower end bar 18 can be easily connected to a mechanical joint such as a screw grout, a screw joint, and a sleeve joint, particularly, a screw joint.

Next, a plurality of upper streaks (not shown) are passed through the stirrup streaks 20 from the side of one beam member 10 to the side of the other beam member, and are arranged above the two beam members.
Reinforcing bars for the floor are placed in the casting space for floor slabs, additional hoops or stirrups are placed at the beam-column joints, and a given formwork (not shown) is placed in a given state. You. Each beam receiver 14 acts as part of a formwork.

Prior to or after the placement of the formwork,
When the bolts 46 for adjusting the height of the beam receiver 14 are unscrewed, each beam member 10 is placed on the receiving member 30 as shown in FIG. Each beam member 1
0 means that one end of the beam main part protrudes into the column-beam joint from the beam receiver 14, but the height position of the upper surface of the beam receiver 14 and the column main part 2
2 are separated from the upper surface of the column main body 22 by a value corresponding to the difference from the height position of the upper surface of the column 2. Therefore, a large space corresponding to the difference between the height position of the upper surface of the beam receiver 14 and the height position of the upper surface of the column main portion 22 is formed between the upper surface of the column main portion 22 and the beam main portion 1.
6 is formed between the lower surface 6 and the lower surface.

Thereafter, the concrete is cast into the beam-column joint, the casting space for the floor slab, and the remaining casting space above the beam member 10. Thereby, the concrete of the beam main part 16 and the column main part 22 is directly integrated with the concrete of the beam-column joint, the concrete of the remaining casting space above the beam member 10, and the concrete for the floor slab. Joined to.

The concrete cast at the beam-column joint is
It penetrates sufficiently into the space between the upper surface of the pillar main portion 22 and the lower surface of the beam main portion 16 to fill the space. As a result, the concrete portion between the upper surface of the column main portion 22 and the lower surface of the beam main portion 16 can also be regarded as an effective portion of the column in terms of structure, and thus the end of the beam main portion 16 is connected to the beam-column joint. Despite being located in the cross section of the column, the effective area of the column at the beam-column joint is increased without making the column thicker.

Each beam receiver 14 is removed at any time after the concrete has solidified. Each beam receiver 14 can be removed by removing the mounting bolt 50. At this time, since each mounting bolt 50 is passed through the elongated hole 42 extending in the vertical direction, by releasing the fastening by the mounting bolt 50, the receiving member 30 moves downward by its own weight, and the beam receiving member is moved. 14 is separated from the beam member 10, and the work of removing the beam receiver 14 is facilitated.

Instead of attaching the beam receiver 14 to the column member 12 with the bolt 50 and the screw hole 52, the column main body 22
May be attached to the column member 12 by a plurality of anchor bolts provided in advance on the upper part of the base member and an attachment nut screwed to each anchor bolt. Each anchor bolt is provided on the column main body so as to project substantially horizontally from the upper side surface of the column main body.

When using an anchor bolt and a nut,
The beam receiver 14 is attached to the column main body by passing an anchor bolt provided in the column main body through the elongated hole and screwing a nut to each anchor bolt. Also in this case, the beam receiver can be removed by removing the nut. In addition, since the anchor bolt is passed through the elongated hole extending in the vertical direction, by releasing the tightening by the nut, the receiving member moves downward, the beam receiver is separated from the beam member, and the work of removing the beam receiver is performed. It will be easier.

When a sleeve joint, welding, or the like is used as a joining means for the opposed lower streaks 18, that is, when it is not necessary to adjust the height of the opposed beam member 10, the height adjusting bolt 46 is not provided. You may.

When the beams are crossed at the column-beam joint, two sets of beam receivers 14 are attached to the upper outer surface of the column main portion 22, as shown in FIG. Next, the lower end streaks 18 that are placed on the beam receiver so that the ends of the pair of beam members 14 face each other and are joined by the joint 54,
Next, the other pair of beam members 10 intersects the pair of beam members 10 arranged first in a cross-shaped manner at the beam-to-column joint and is placed on the beam receiver 14 so as to face each other, and the opposed lower end streaks 18 are joined. They are joined by 54, after which the upper muscle is placed.

Each of the beam members 10 and the column members 12 may be made of concrete having the same strength.
2 may be made of concrete having higher strength than the beam main body 16. In the latter case, the beam main body 16
Of the end, in particular, at least the portion that enters the cross section of the end at the beam-to-column joint, is made of concrete having substantially the same strength as the concrete of the column main portion 22; It is preferable to be cast at the beam-column joint.

A recess or cotter opening on the end surface of the beam member may be formed on each surface of the beam member. With this configuration, after the beam member is assembled to the beam-column joint, concrete is poured into the beam-column joint, and a part of the concrete enters the cotter and solidifies. Relative positional relationship is maintained.

Similarly, a groove may be formed in the beam member so as to open on the upper surface of the beam member and extend in the longitudinal direction of the column member. In this way, after assembling the beam member to the beam-column joint, by casting concrete for the floor slab, a part of the concrete enters the groove and solidifies. Are maintained.

The present invention is not limited to the above embodiment. For example, the present invention can be applied to a beam member having a semicircular cross-sectional shape, and can also be applied to a column member having a circular cross-sectional shape.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a beam-column joint for explaining a joining method of the present invention, and is a front view showing a state in which a pair of beam members is joined at an upper portion of a column member.

FIG. 2 is an enlarged front view showing the vicinity of a beam receiver in FIG. 1 and a front view showing a state in which the height has been adjusted.

FIG. 3 is an enlarged side view showing the vicinity of a beam receiver of FIG. 1;

FIG. 4 is a plan view showing an embodiment in which beams cross in a cross shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Beam member 12 Column member 14 Beam receiver 16 Beam main part 18 Lower end bar 22 Column main part 24 Column main bar

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tomoaki Tsujimura 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Co., Ltd. Kumagaya Gumi Tokyo headquarters (56) References JP-A-5-306543 (JP, A) JP-A-51-6320 (JP, A) JP-A-6-322820 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/21 E04B 1/30 E04B 1/16 E04G 21 / 12 105 E04G 21/14-21/22

Claims (2)

(57) [Claims] 1. A method of joining at least a pair of precast concrete beam members having a beam main portion and a concrete column member having a column main portion at a beam-column joint on an upper side of the column main portion. In order to form a space in which concrete can enter between the upper surface of the pillar main portion and the lower surface of the beam main portion, a beam receiver is provided at each of opposing portions of the upper side surface of the column main portion. Attached in a state where the height position of the upper surface is higher than the height position of the upper surface of the column main portion, and puts one end of the beam main portion on each beam receiver in a state where the end surface is above the column main portion, A method of joining a column and a beam, comprising: arranging a formwork that forms at least the beam-to-column joint, and casting concrete at least to the beam-to-column joint. 2. The joining method according to claim 1, further comprising joining the beam main reinforcing bars facing each other with a joint before the concrete is poured.