JPH08177155A - Connecting structure of steel girder with pc floor board and connecting method thereof - Google Patents

Abstract

PURPOSE: To secure the connecting strength of respective floor boards while PC floor boards to be connected are being simply connected with each other. CONSTITUTION: The end section of a PC floor board 14 is rested on the upper surface of the upper flange 12a of a steel girder 12. The connection side end section of the PC board 14 is formed into a recessed and projection section 16. In the recessed and projection section 16, the width L2 of a projection section 16b is made sufficiently smaller than the width L1 of a recessed section 16a. Each gap section 18 is formed between the adjacent projection sections 16b by adjusting the meshing condition of each recessed and projection section 16. Stud bolts 20 are erected in the upper flange 12a of the steel girder 12 in advance at the position of each gap section 18. After the recessed and projection sections 16 have been mutually meshed, concrete 22 and the like are placed in the gap section 18, and concurrently the stud bolts 20 are buried in the concrete 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of connecting PC (precast concrete) floor slabs to steel beams to be connected to each other.

[0002]

2. Description of the Related Art In recent years, along with automation of construction methods for steel-framed buildings (fully automatic building construction system), a construction method of connecting a PC floor plate to a steel beam instead of a slab floor plate by a formwork method has been adopted. ing. In this construction method, the connection side end portions of the PC floor slabs to be connected to each other are placed on both sides of the steel frame beam, and a gap (groove portion) formed between the end portions of these PC floor slabs is placed.
Since it is a method of integrating by filling with a filling material such as mortar and concrete, it is possible to greatly omit the conventional work of assembling formwork and supporting work, dismantling and removal, and work of pouring in-place concrete. it can.

However, if the gaps between the PC floor slabs are simply filled with the filling material, the connection end faces of these PC floor slabs are simply finished straight, so that sufficient connection strength cannot be obtained. Therefore, in the related art, FIG.
The method shown in (c) was performed.

The method (a) is a steel frame beam 1 made of H-shaped steel.
While a large number of stud bolts 2, 2 ... Are provided in the center of the upper surface of the upper flange of the PC along the longitudinal direction, a large number of streaks 3a are provided at the installation end of each PC floor slab 3, 3. , PC floor slabs 3, 3 are installed such that the tip portions of the respective rebars 3a are projected toward each other with the stud bolts 2, 2 sandwiched therebetween, and in the gaps between both PC floor slabs 3, 3. It is designed to be filled with a filler.

In the method (b), each PC floor slab 3,
Plates 3b, 3b that overlap each other are projected at the connection end of the PC 3, and the overlapped parts are welded to each other to be integrated with each other, so that the space between the PC floor plates 3, 3 is filled with a filler. .

The method (c) is carried out for each PC floor slab 3,
A U-shaped horizontal loop-shaped bar 3c at the connection end of 3,
3c is provided in a projecting manner, the loop ends of the respective reinforcing bars 3c, 3c are fitted in the stud bolts 2 and placed in an overlapping arrangement, and the gaps between the PC floor slabs 3, 3 are filled with a filler. It is like this.

[0007]

However, in such a conventional method for connecting the steel beam and the PC floor slab,
In the method of (a), the fixing length of the reinforcing bar 3a tends to be insufficient and uneven, and conversely, when the fixing length is set to be long, the opposing reinforcing bar 3a wraps and the workability deteriorates. I will end up.

On the other hand, in the method (b), the plates 3b, 3
Although the PC floor slabs 3 can be firmly connected to each other by the welding of b, it goes without saying that complicated welding work is required.
It is necessary to polymerize the plates 3b and 3b in a close contact state. Therefore, the plates 3b and 3b to be connected to each other have to be vertically protruded from the PC floor slabs 3 and 3 to be connected by the plate thickness of the plates 3b and 3b. The frame becomes complicated and the cost for molding the PC floor slabs 3, 3 increases. Also, PC floor slabs 3, 3
PC floor slabs 3, 3 because directionality is required when assembling
Assembling workability deteriorates.

Further, although the method (c) can prevent the falling, the PC floor slabs 3, 3 are positioned in a state in which the reinforcing bar 3c is fitted to the stat bolts 2, 2 ... 3c need to be wrapped around each other. Therefore, it is necessary to alternately install the opposing reinforcing bars 3c and 3c on the steel beam 1, which causes various problems that the assembly procedure becomes troublesome and the workability deteriorates.

In view of such conventional problems, the present invention provides a steel frame beam and a PC floor slab capable of ensuring the connection strength between the PC floor slabs to be connected while easily connecting them. An object is to provide a connection structure and a connection method thereof.

[0011]

In order to achieve the above object, the joining structure of a steel frame beam and a PC floor slab according to the present invention is such that adjacent PC floor slabs are placed on the upper surface of the steel frame beam and are butted against each other. In the connection structure between the steel beam and the PC floor slab that are connected by means of the above-mentioned method, a concavo-convex portion is formed at the edge portions that are abutted against each other, and the convex portion is formed in the concave portion of the other PC floor slab with the convex portion. A PC floor slab interdigitated with a gap therebetween and a PC floor slab projectingly provided on the upper surface of the steel frame beam, and the PC floor slabs are butted against each other and placed on the steel frame beam to form between the convex portions. The stud member located in the gap portion and the concrete or mortar which is poured and filled in the gap portion to bury the stud member.

Further, according to the method of joining the steel frame beam and the PC floor slab of the present invention, the adjacent PC floor plates are placed on the upper surface of the steel frame beam, and the steel frame beam and P are connected to each other by butting them.
In the method of connecting to the C floor slab, uneven portions are formed on the edge portions of the PC floor slab that are abutted against each other, and the respective uneven portions are meshed with each other so that the PC floor slabs are abutted with each other, and are also uneven. When the parts are engaged with each other, the stud member is located in the gap formed between the adjacent protrusions, the stud member is projected from the upper surface of the steel beam, and then the stud member is embedded in the concrete in the gap portion. Alternatively, it is characterized in that mortar is poured and filled.

[0013]

With the above structure, in the structure for connecting the steel beam and the PC floor slab of the present invention and the method of connecting the same, the uneven portions formed at the edge portions where the PC floor slabs to be connected to each other are butted against each other However, since the concrete or mortar is poured and filled in the gap between the adjacent convex parts by meshing while being placed on the upper side of the steel beam, the side surfaces of the adjacent convex parts are hardened by hardening of this concrete etc. Are connected to each other and the respective PC floor slabs are connected to each other.
In addition, since the stud member that is located in the gap and projects from the steel beam is embedded in the concrete or the like,
The abutting portion of the floor slabs can be firmly bonded to the steel beam. Therefore, when the PC floor slabs are connected to each other, hardened concrete or the like is interposed between the adjacent convex portions, so that the PC floor slabs are surely prevented from being displaced in the length direction of the steel beam, and the adjacent Since concrete or the like is bonded to the side surface of the raised portion, a great resistance is exerted against the force of separating the PC floor slab in the butt direction. Therefore, in the PC floor slab, a large connection strength can be secured without projecting a reinforcing bar or a plate from the end edges to be abutted with each other, and the stud member is provided by engaging the concave and convex portions with each other. The PC floor slabs can be connected to each other by a simple operation of pouring and filling concrete or the like in the gap.

[0014]

Embodiments of the present invention will now be described 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 its connection method is shown,
1 is a plan view of an essential part of a connecting portion, FIG. 2 is a sectional view of an essential part of a connecting portion, and FIG. 3 is a schematic plan view showing a laid state of a PC floor slab.

As shown in FIG. 3, the steel frame beam and the PC floor slab are composed of columns 10, 10, ... Between the columns 10, 10 ...
12 ... are connected in a grid shape, and a plurality of strips (5 sheets in this embodiment) of PC floors are formed in a rectangular shape in the rectangular-shaped defined portion of the steel beams 12, 12 ... Connected in the grid shape. Edition 14,
14 ... are respectively laid in one direction. Therefore, both end portions X, X of the PC floor slabs 14, 14 are placed so as to straddle between the unidirectional steel beams 12, 12 (vertical direction in FIG. 3). Further, the PC floor slabs 14, 14 ...
Two PC floor slabs 14, 1 located on both sides (both upper and lower sides in FIG. 3) of the defined portion when laid on the defined portion 12.
4 is a steel beam 1 whose one side edge Y in the width direction is orthogonal to
2, 12 (left and right direction in FIG. 3).

The steel beam 12 is made of H-shaped steel as shown in FIGS. 1 and 2, and the upper flange 12 of the steel beam 12 is made.
The lengthwise end portions X of the PC floor slabs 14, 14 ... Are placed on the upper surface of a. Concavo-convex portions 16 are formed at the end portions X in the length direction of the PC floor slab 14 placed on the steel beam 12, and the concavo-convex portion 16 is connected to the other adjacent steel frame beams 12, 12, ...
Is meshed with the concavo-convex portion 16 of the PC floor slab 14 which is laid in the defined portion.

In the uneven portion 16, the width L2 of the convex portion 16b is sufficiently narrower than the width L1 of the concave portion 16a (in this embodiment, approximately 1).
About / 3). Then, the uneven portion 16
When engaging with each other, the mating convex portion 16b is arranged to fit into the substantially central portion of the concave portion 16a. In this state, one convex portion 16b and the other convex portion 16b are separated by a predetermined distance W.
Are arranged in the longitudinal direction of the steel beam 12, and the gap portion 1 is provided between the adjacent convex portions 16b, 16b.
8 and 18 are formed. The concave portion 16a and the convex portion 16
The widths L1 and L2 of b can be freely set according to the design and construction conditions.

On the other hand, the upper flange 12 of the steel beam 12
A stud bolt 20 as a stud member is provided upright in a at the gap portion 18. The stud bolt 20 is in the width direction of the upper flange 12a (left-right direction in FIG. 1).
Two are confronted with an appropriate interval. The stud bolt 20 is welded to the upper flange 12a or screwed into a screw hole formed in the upper flange 12a. These stud bolts 20 are mounted before the PC floor slab 14 is placed. Alternatively, it may be attached after the PC floor slab 14 is arranged.

Next, after the concave and convex portions 16 and 16 of the PC floor slabs 14 and 14 are engaged with each other, the gap portion 18 is formed.
Then, mortar or concrete 22 is poured and filled in, 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, 20 standing upright in the gap portion 18 are buried in the cast concrete 22. In the case of mortar, it is desirable to use high strength mortar. Further, a cotter (not shown) is provided on the side portion 16d of the convex portion 16b and the side surface 16c of the concave portion 16a in order to prevent the PC floor slabs 14 and 14 from being separated from each other in the direction opposite to the butting direction. It is preferably formed.

PC floor slab 1 connected as described above
4 and 14 are formed with concavo-convex portions 16 and 16 at the end X in the length direction of the PC floor slab 14 to be connected, and the concavo-convex portions 16b and 16b adjacent to each other in the meshed state of the concavo-convex portions 16 and 16 are formed. Concrete 22 or the like is poured into the gap portions 18, 18 between. Accordingly, when the cast concrete 22 is hardened and the action of the cotter is combined, the side surfaces 16c, 16 of the adjacent convex portions 16b, 16b are
c are connected to each other. In addition, the gap portion 1
Located at 8, 18 ... Steel beam 12 to stud bolt 2
0 are projected, and these stud bolts 20 are buried in the concrete 22 that is cast in the gap portions 18, 18. Therefore, the concrete 22 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 increased. Significantly increased.

By the way, when the PC floor slabs 14 and 14 are connected to each other, the hardened concrete 22 and the like are interposed between the adjacent convex portions 16b and 16b, so that the PC floor slabs 14 and 14 of the steel beam 12 are connected. It is possible to reliably prevent displacement in the length direction. In addition, the concrete 22
Together with the action of the cotter, the adjacent protrusions 16b, 1b
Since it is coupled to the side surfaces 16c, 16c of the 6b, a great resistance is exerted also to the force along the coupling surface, that is, the peeling force in the abutting direction of the PC floor slabs 14, 14 (left-right direction in FIG. 1). Exert strength. Therefore, the PC floor slab 14,
14 can secure a large connection strength without projecting a bar or a plate from the end portion X as in the conventional case. 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 molding the PC floor slab 14, so that the molding work of the PC floor slab 14 can be facilitated. be able to. In addition, as work on site, before installing the PC floor slabs 14, 14, the steel beam 12
By installing the stud bolt 20 on the PC,
When connecting the floor slabs 14, 14, it is possible to perform the simple work of engaging the concave-convex portions 16, 16 with each other and placing the concrete 22 in the gap portions 18, 18 ... The connection work of can be significantly simplified.

By the way, in the above embodiment, the case where the uneven portion 16 is formed at the end portion X in the length direction of the PC floor slab 14 is disclosed, but the present invention is not limited to this, and as shown in FIG.
PC floor slab 14 placed on steel beams 12, 12 in the orthogonal direction
The same connection can be made at the side edge Y in the width direction. That is, also in this embodiment, the same uneven portion 16 as shown in FIGS. 1 and 2 is formed similarly to the above-described embodiment, and the stud bolt 20 is erected from the steel frame beam 12 and the uneven portion 16 is formed. Via the side edges Y of the PC floor slab 14 to the steel beam 1
It is desirable to connect on two.

Therefore, the side edge Y of the PC floor slab 14 is thus
By connecting the two via the uneven portion 16, P
The widthwise side edge Y of the C floor slab 14 is provided with the convex portion 16 of the concave-convex portion 16.
The widthwise side edges Y are connected to each other by concrete 22 or the like that is cast in the gap portion 18 between b, and the stud bolts 22 projecting from the steel beam 12 are embedded in the cast concrete 22 so that the widthwise side edges Y are made of steel. It can be firmly connected to the beam 12. Therefore, even in this case, since the hardened concrete 22 is coupled between the adjacent convex portions 16b, the PC floor slabs 14 located on both sides of the defined portion of the steel beam 12, 12, ... Are displaced in the length direction. It is possible to surely prevent the above, and to exert a great resistance force against the force that the PC floor slab 14 is separated in the width direction.

[0024]

As described above, the steel beam and P of the present invention are used.
In the connection structure with the C floor slab and the method of connecting the same, uneven portions are formed respectively on the edges where the PC floor slabs to be connected are butted, and these uneven portions are engaged with each other on the upper side of the steel beam. Concrete or mortar was poured and filled in the gap between the adjacent convex portions in this state, and the stud member projecting from the steel beam located in this gap was embedded in the concrete, so it was placed. By hardening concrete or the like, the side surfaces of the adjacent convex portions can be connected to each other, and the cast concrete or the like can be connected to the steel beam through the stud member. At this time, in a state where the PC floor slabs are connected to each other, hardened concrete or the like is interposed between the adjacent convex portions, so that the PC floor slab is reliably prevented from shifting in the length direction of the steel beam, and Since concrete or the like is bonded to the side surfaces of the adjacent convex portions, a great resistance force is exerted against the force of separating the PC floor slab in the butting direction. Therefore, the PC floor slab can secure a large connection strength without projecting a reinforcing bar or a plate from the connection end portion, and concrete or the like can be provided in the gap portion where the stud member is projected by engaging the uneven portions with each other. The PC floor slabs can be connected to each other by the simple operation of casting and filling.

[Brief description of 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 and a connection method therefor according to the present invention.

FIG. 2 is a cross-sectional view of an essential part of a connecting portion showing an 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) respectively.

[Explanation of symbols]

12 steel beam 12a upper flange 14 PC floor slab 16 uneven part 16a concave part 16b convex part 18 gap part 20 stud bolt (stud member) 22 concrete 22 gap part X lengthwise end Y widthwise side edge

Claims (2)

[Claims] 1. In a connection structure of a steel frame beam and a PC floor slab, wherein adjacent PC floor slabs are placed on the upper surface of a steel frame beam, and are connected to each other by abutting each other, at edge portions to be abutted to each other. An uneven portion is formed, and this convex portion is the other PC
A PC floor slab that is meshed with the convex portion in the concave portion of the floor slab, and is projected on the upper surface of the steel beam,
A stud member positioned in the gap portion formed between the convex portions by abutting the PC floor plates to each other and placing them on the steel beam, and the stud member that is driven and filled in the gap portion. A connection structure between a steel beam and a PC floor slab, characterized in that it is composed of concrete or mortar for burying. 2. A method for connecting a steel frame beam and a PC floor slab, wherein adjacent PC floor slabs are placed on the upper surface of the steel frame beam and are butt-connected to each other.
Concavo-convex portions are formed on the edge portions that are abutted against each other, and the above-mentioned PC floor slabs are abutted with each other by engaging the respective concave-convex portions with each other. A stud member protruding from the upper surface of the steel beam, and then concrete or mortar is poured into and filled in the gap portion so as to bury the stud member. How to connect to a PC floor slab.