JP3031185B2 - Connection structure between steel beam and PC slab and connection method - 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 connecting PC (precast concrete) floor slabs to steel beams and connecting them to each other.

[0002]

2. Description of the Related Art In recent years, with the automation of construction methods for steel-framed buildings (a fully automatic building construction system), a method of connecting a PC slab to a steel beam instead of a slab slab by a formwork method has been adopted. ing. In this method, the connection side ends of the PC slabs to be connected to each other are placed on both sides of the steel beam, and a gap (groove) formed between the ends of the PC slabs.
Mortar, concrete, and other fillers, so that they can be integrated into a single unit, greatly reducing the work of assembling and dismantling and removing cast-in-place concrete, as well as placing cast concrete in place. it can.

However, simply filling the gap between the PC slabs with the filler does not provide sufficient connection strength because the connection end faces of the PC slabs are simply straightened. For this reason, conventionally, FIG.
The method shown in (c) has been performed.

[0004] The method (a) uses a steel beam 1 made of H-section steel.
A number of stud bolts 2, 2, ... are provided in the center of the upper surface of the upper flange along the longitudinal direction, while a number of studs 3a are provided at the installation ends of the PC floor plates 3, 3. The PC floor slabs 3 and 3 are installed so that the tips of the respective reinforcing bars 3a protrude toward each other with the stud bolts 2 and 2 interposed therebetween. It is designed to be filled with a filler.

[0005] The method (b) is based on the respective PC slabs 3,
Plates 3b, 3b, which overlap each other, are projected from the connection end of 3 and are integrated by welding these overlapped parts to each other, so that the gap between the PC slabs 3, 3 is filled with a filler. .

[0006] The method (c) is based on the respective PC slabs 3,
3, a U-shaped horizontal loop-shaped stud 3c,
3c is protruded, and the loop ends of the respective reinforcing bars 3c, 3c are fitted to the stud bolts 2 and placed in an overlapping state, and the gap between the PC floor plates 3, 3 is filled with filler. It has become.

[0007]

However, in the conventional connection method between the steel beam and the PC slab,
In the method (a), the fixing length of the streak 3a tends to be insufficient and uneven, and conversely, if the fixing length is set to be long, the opposing streak 3a wraps and the workability deteriorates. I will.

On the other hand, in the method (b), the plates 3b, 3
By the welding of b, the PC slabs 3 and 3 can be firmly connected to each other, but of course, a complicated welding operation is required,
The plates 3b, 3b need to be polymerized in a substantially close state. For this reason, the plates 3b, 3b have to be protruded from the PC floor slabs 3, 3 to be connected, so as to be shifted up and down by the thickness of the plates 3b, 3b. The frame becomes complicated, and the cost for molding the PC floor slabs 3, 3 increases. Also, PC floor slabs 3,3
Direction is required at the time of assembling PC floor slabs.
The workability of assembling of the device deteriorates.

Although the method (c) can prevent the falling off, the PC floor slabs 3, 3 are positioned in a state where the reinforcing bars 3c are fitted to the stat bolts 2, 2,. 3c need to be wrapped together. For this reason, it is necessary to alternately install the facing studs 3c, 3c on the steel beam 1, and there are various problems that the assembling procedure is troublesome and the workability is deteriorated.

In view of the above-mentioned conventional problems, the present invention provides a method of connecting a steel beam and a PC floor slab which can easily connect the PC slabs to be connected and secure the strength of each connection. It is an object to provide a connection structure and a connection method thereof.

[0011]

In order to achieve the above object, a joint structure of a steel beam and a PC slab according to the present invention is arranged such that adjacent PC slabs are placed on the upper surface of the steel beam and butted against each other. In the connection structure between the steel beam and the PC floor slab, which are connected to each other, an uneven portion is formed at the edge portions abutting each other, and the convex portion is separated by a gap portion on both sides thereof,
The PC slab engaged with the center in the concave portion between the convex portions of the other PC slab, and the opposite direction of the butting between the PC slabs.
The above facing each other to prevent peeling in opposite directions
Cotters formed on the side of the protrusion and the side of the recess
If, projecting from the upper surface of the steel beam, and the stud member to be positioned in the gap portion formed between the convex portions each other by placing against these PC slab between the iron trabecular on, It is characterized by being made of concrete or mortar which is cast and filled in the gap portion to bury the stud member.

[0012] Further, according to the method of joining a steel beam and a PC slab of the present invention, a steel beam and a PC slab in which adjacent PC slabs are placed on the upper surface of the steel beam and are connected by abutting each other.
In the method of connecting to the C floor slab, the PC floor slab is formed with uneven portions at edges that abut against each other ,
Peeling these PC floor slabs in the opposite direction to the butting direction
In order to prevent separation, the side portions and the convex portions facing each other
And a cotter is formed on the side of the above concave part, and one PC floor slab
Of the other PC floor with a gap on both sides
The PC floor slabs are abutted against each other by meshing with the center in the concave portion between the convex portions of the plate, and the steel frame is positioned at a gap formed between adjacent convex portions when the concave and convex portions are meshed with each other. A stud member is protruded from the upper surface of the beam, and then concrete or mortar is cast and filled in the gap so as to bury the stud member.

[0013]

According to the above-mentioned structure for connecting a steel beam to a PC slab and a method of connecting the same, according to the present invention, an uneven portion formed on an edge portion where PC slabs to be connected to each other abut against each other. but one in a state of being placed on the upper side of the steel beam
Of the PC floor slab, separated by gaps on both sides,
Into the center of the recess between the projections of the other PC floor slab,
Again, the direction of butting between these PC slabs is opposite
In order to prevent peeling in
Form a cotter on the side and the side of the recess, and then,
Since concrete or mortar is cast and filled in the gap between the adjacent convex portions, the side surfaces of the adjacent convex portions are connected to each other by hardening of the concrete or the like,
Each PC slab is connected to each other. Further, since the stud member projecting from the steel beam located in the gap portion is buried in the concrete or the like, the butted portion of the PC floor slabs can be firmly connected to the steel beam.
Therefore, when the PC slabs are connected to each other, hardened concrete or the like is interposed between the adjacent protrusions, so that the PC slabs are prevented from shifting in the longitudinal direction of the steel beam, and Since the concrete or the like is bonded to the side surface of the convex portion, the PC floor slab exerts a large resistance against a force that separates the PC slab in the butting direction. Therefore, the P
The C floor slab can secure a large connection strength without projecting a streak or a plate from the edge to be abutted. The PC slabs can be connected to each other by a simple operation of casting and filling concrete or the like.

[0014]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 show a steel beam and a PC of the present invention.
An example of a connection structure with a floor slab and a connection method thereof,
1 is a plan view of a main part of a connection part, FIG. 2 is a cross-sectional view of a main part of a connection part, and FIG. 3 is a schematic plan view showing a laid state of a PC slab.

As shown in FIG. 3, the steel beam and the PC slab are arranged in a grid pattern of columns 10, 10,.
Are connected in a grid pattern, and a plurality of (five in the present embodiment) PC floors formed in a strip shape are formed on the rectangular defined portions of the steel beams 12, 12 connected in a grid pattern. Edition 14,
.. Are laid in one direction. Therefore, both ends X, X of the PC floor slabs 14, 14,... Are placed so as to straddle between the steel beams 12, 12 in one direction (vertical direction in FIG. 3). Also, the PC floor slabs 14, 14...
12, two PC floor slabs 14, 1 located on both sides (upper and lower sides in FIG. 3) of this defined portion
4 is a steel beam 1 whose one side edge Y in the width direction is orthogonal.
2, 12 (in the horizontal direction in FIG. 3).

As shown in FIGS. 1 and 2, the steel beam 12 is formed of an H-shaped steel.
are placed on the upper surface of the PC floor slab 14, 14... An uneven portion 16 is formed at each longitudinal end X of the PC floor slab 14 placed on the steel beam 12, and the uneven portion 16 is connected to the other adjacent steel beam 12, 12,.
Is engaged with the uneven portion 16 of the PC floor slab 14 which is laid on the defined portion.

In the uneven portion 16, the width L2 of the convex portion 16b is sufficiently smaller than the width L1 of the concave portion 16a (in the present embodiment, approximately 1 mm).
/ 3). Then, the irregularities 16
Are arranged so that the mating convex portion 16b is fitted to the substantially central portion of the concave portion 16a. In this state, the one protrusion 16b and the protrusion 16b on the other side are separated by a predetermined distance W.
Are arranged in the length direction of the steel beam 12, and a gap 1 is formed between the adjacent protrusions 16b.
8, 18,... Are formed. The concave portion 16a and the convex portion 16
The widths L1 and L2 of b can be set freely according to design and construction conditions.

On the other hand, the upper flange 12 of the steel beam 12
A stud bolt 20 serving as a stud member is provided upright at the gap portion 18 in FIG. The stud bolt 20 is in the width direction of the upper flange 12a (the horizontal direction in FIG. 1).
Are confronted at appropriate intervals. The stud bolts 20 are welded to the upper flange 12a or screwed into screw holes formed therein, and these stud bolts 20 are attached before placing the PC floor slab 14. It may be attached after the PC floor slab 14 is arranged.

Next, after the concave and convex portions 16, 16 of the PC floor slabs 14, 14 are engaged with each other, the gap portion 18 is formed.
Is filled with mortar or concrete 22, and the side surface 16c of the concave portion 16a and the side surface 16d of the convex portion 16b are joined by the concrete 22 or the like. At this time, the stud bolts 20 erected in the gap portion 18 are buried in the cast concrete 22. In the case of mortar, it is desirable to use a high strength mortar. Also, cotters (not shown) are provided on the side portions 16d of the convex portions 16b and the side surfaces 16c of the concave portions 16a in order to prevent the PC floor slabs 14 from being peeled off in a direction opposite to the butting direction. It is preferable to form them.

The PC floor slab 1 connected as described above
The projections 4 and 14 are formed with projections and recesses 16 and 16 at the longitudinal ends X of the PC floor slab 14 to be connected, and the projections 16 b and 16 b adjacent to each other in a state where the projections and recesses 16 and 16 are engaged with each other. Concrete 22 and the like are cast in the gap portions 18, 18,. Therefore, the hardening of the poured concrete 22 and the action of the cotter also contribute to the side faces 16c, 16b of the adjacent convex portions 16b, 16b.
c are connected to each other. Further, the gap portion 1
Stud bolt 2 from steel beam 12
0 are protruded, and these stud bolts 20 are buried in the concrete 22 cast in the gap portions 18. Accordingly, the concrete 22 for connecting the convex portions 16b, 16b is firmly connected to the steel beam 12 via the stud bolts 22, and the connection strength between the PC floor slabs 14, 14 is extended. It is significantly increased.

When the PC slabs 14 are connected to each other, the hardened concrete 22 and the like are interposed between the adjacent convex portions 16b, 16b. The displacement in the length direction can be reliably prevented. The concrete 22
Are combined with the action of the cotter so that the adjacent convex portions 16b, 1
6b is joined to the side surfaces 16c, 16c of the PC floor slabs 6b, that is, a large resistance against the force peeled off in the direction along the joint surface, that is, in the butting direction of the PC floor slabs 14, 14 (left-right direction in FIG. 1). Demonstrate power. Therefore, the PC floor slab 14,
14 can secure a large connection strength without projecting a streak, a plate, or the like from the end portion X as in the related art. Therefore, it is not necessary to project a connecting member such as a reinforcing bar or a plate from the end portion X of the PC floor slab 14 at the time of forming the frame of the PC floor slab 14, thereby facilitating the molding operation of the PC floor slab 14. be able to. In addition, as work on site, before installing the PC floor slabs 14, 14
The stud bolt 20 is protruded from the
When connecting the floor slabs 14, 14, the simple operation of engaging the uneven portions 16, 16 with each other and placing concrete 22 in the gap portions 18, 18,. Can be significantly simplified.

By the way, in the above embodiment, the case where the uneven portion 16 is formed at the longitudinal end portion X of the PC floor slab 14 has been disclosed. However, without being limited to this, as shown in FIG.
PC floor slab 14 placed on orthogonal steel beams 12,12
A similar connection can be made at the width direction side edge Y. That is, in this embodiment as well, the same irregularities 16 as shown in FIGS. 1 and 2 are formed in the same manner as in the above-described embodiment, and the stud bolts 20 are erected from the steel beam 12 to form the irregularities 16. Between the side edges Y of the PC floor slab 14 through the steel beam 1
It is desirable to connect on 2.

Accordingly, the side edge Y of the PC floor slab 14 is thus obtained.
By connecting each other through the uneven portion 16, P
The width side edge Y of the C floor slab 14 is
b are connected to each other by concrete 22 or the like cast in the gap 18 between the steel beams 12, and stud bolts 22 projecting from the steel beam 12 are buried in the cast concrete 22 so that the width-direction side edge Y is It can be firmly connected to the beam 12. Therefore, even in this case, since the hardened concrete 22 is bonded between the adjacent convex portions 16b, the PC floor slabs 14 located on both sides of the defined portions of the steel beams 12, 12,. This can be reliably prevented, and a large resistance can be exerted against the force in which the PC floor slab 14 is separated in the width direction.

[0024]

As described above, the steel beam of the present invention and P
In the connection structure and the connection method with the C floor slab, the PC floor slab to be connected is formed with an uneven portion at an edge portion where the PC floor slabs abut each other.
To prevent peeling in the direction opposite to the butting direction
And the side of the convex and the side of the concave facing each other.
These irregularities are formed on the upper side of the steel beam,
The convex portion of the C floor slab is separated by a gap on both sides thereof,
A concrete or mortar is cast and filled into a gap between adjacent projections while being engaged with the center of the recess between the projections of the PC floor slab, and a stud projecting from a steel beam located in the gap. Since the members are embedded in the concrete, the side surfaces of the adjacent convex portions can be connected to each other by hardening of the cast concrete or the like, and the cast concrete or the like can be connected to the steel beam via the stud member. Can be combined. At this time, in the state where the PC slabs are connected to each other, hardened concrete or the like is interposed between the adjacent convex portions, so that the PC slabs are reliably prevented from shifting in the length direction of the steel beam, Since concrete or the like is bonded to the side surface of the adjacent convex portion, a large resistance is exerted against the force of separating the PC slab in the butting direction. Therefore, the PC floor slab can secure a large connection strength without projecting a streak or a plate from the connection end, and concrete or the like can be provided in the gap portion where the stud member is protruded by engaging the uneven portions with each other. The PC slabs can be connected to each other by a simple operation of casting and filling.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a connection portion showing an embodiment of a connection structure between a steel beam and a PC floor slab according to the present invention and a connection method thereof.

FIG. 2 is a cross-sectional view of a main part of a connection portion showing one embodiment of the present invention.

FIG. 3 is a schematic plan view showing a laid state of a PC floor slab applied to the present invention.

FIG. 4 is a plan view of a main part showing a conventional connection method by (a) to (c).

[Explanation of symbols]

Reference Signs List 12 steel beam 12a upper flange 14 PC floor slab 16 uneven portion 16a concave portion 16b convex portion 18 gap portion 20 stud bolt (stud member) 22 concrete 22 gap portion X length end Y width direction side edge

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04B 5/02

Claims (2)

(57) [Claims] 1. A connecting structure of a steel beam and a PC floor slab in which adjacent PC slabs are placed on the upper surface of a steel beam and connected to each other by abutting each other. uneven portion is formed, the convex portion, both sides
In the recess between the projections of the other PC slab , with a gap between
PC floor slabs engaged in the center and these PC slabs
To prevent peeling in the direction opposite to the butting direction
The side of the convex portion and the side of the concave portion facing each other.
The cotter formed on the surface and the PC beam slab protruding from the upper surface of the steel beam are placed on the steel beam by abutting these PC floor slabs and placed on the gap formed between the convex portions. A connection structure between a steel beam and a PC slab, comprising: a stud member to be formed; and concrete or mortar cast and filled in the gap portion to bury the stud member. 2. A method of connecting a PC slab to a steel slab in which adjacent PC slabs are placed on the upper surface of a steel beam and connected to each other by abutting each other.
It is said that irregularities are formed at the edges that abut each other
In the opposite direction to the direction in which these PC slabs meet.
In order to prevent exfoliation, the protrusions facing each other
Forming a cotter on the side surface side and the recess, one of the P
C Place the convex part of the floor slab, with a gap
The above-mentioned PC is engaged with the center in the concave portion between the convex portions of the PC floor slab.
While the floor slabs are abutted with each other, a stud member is protruded from the upper surface of the steel beam by being located in a gap formed between adjacent convex portions when the uneven portions are engaged with each other. A method of connecting a steel beam and a PC slab, wherein concrete or mortar is cast and filled in the gap portion so as to bury the steel.