JP5372587B2 - Steel / concrete composite floor slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel-concrete composite floor slab which enables a steel panel of the composite floor slab to be economically manufactured in a short period of time by reducing the number of man-hours for manufacturing, and the amount of welding. <P>SOLUTION: A bottom steel plate 2 is laid on a plurality of main girders which are laid in parallel at predetermined spaces. A plurality of hat-shaped rib materials 3 are laid at predetermined spaces in parallel in a direction perpendicular to a bridge axis and in the direction of the bridge axis on the bottom steel plate 2. A plurality of headed studs 4 are mounted at predetermined spaces in the direction of the bridge axis and in a direction perpendicular to the bridge axis on the bottom steel plate 2 between the hat-shaped rib materials 3 and 3. Concrete 6 is placed. The hat-shaped rib material 3 which is formed in such a shape as to have a U-shaped cross section, includes a rib material body 3a, and fin pieces 3b and 3b which are horizontally and protrusively provided at lower ends on both sides of the rib material body, respectively. The fin pieces 3b and 3b at both the sides are welded to the bottom steel plate 2 by deck-plate penetration stud welding using a plurality of studs 8. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a steel / concrete composite floor slab, and is mainly applied to a floor slab of a road bridge.

  Cast-in-place concrete slabs, precast concrete slabs, steel / concrete composite slabs (hereinafter “synthetic slabs”), and the like are used for road slabs. Of these, cast-in-place reinforced concrete slabs are generally inexpensive, but there are problems such as a long construction period because all the formwork and reinforcement work are performed on site.

  On the other hand, the precast concrete floor slab is manufactured at the factory for the majority of the floor slab panel, but it is necessary to divert the formwork at the time of placing the concrete to increase efficiency, so the degree of freedom regarding the shape of the floor slab panel is low, In addition, the floor slab panels manufactured in the factory have problems such as high transportation costs due to their large weight.

  Against this background, there are an increasing number of cases where synthetic floor slabs are applied as floor slabs for road bridges. The basic components of composite floor slabs are bottom steel plate, rib material, anti-slipping, rebar, concrete, and various synthetic floor slabs are commercialized due to differences in rib materials and anti-slipping types. Some also use both a material and a stopper.

  Also, in general construction of composite floor slabs, steel panels made of bottom steel plates, ribs, and slip stoppers are manufactured at the factory, and after this steel panel is laid on the girder at the construction site, cast-in-place concrete is applied. In particular, steel panels are lighter than precast concrete slab panels, and therefore have advantages such as high transport efficiency.

  FIG. 10 shows a general composite floor slab. In the figure, a plurality of steel plate ribs 16 having substantially the same thickness as the bottom steel plate are projected on the bottom steel plate 2 at regular intervals. A plurality of headed studs 4 are projected at regular intervals on the bottom steel plate 2 between them.

  The bottom steel plate 2, the steel plate rib 16 and the headed stud 4 are processed and manufactured to a predetermined size as a steel panel of a synthetic floor slab at a factory, and the steel panel manufactured at the factory is laid on the main girder locally, and On top of that, main reinforcing bars 5a and distribution reinforcing bars 5b are arranged, and concrete 6 is placed.

  In particular, the steel plate rib has a function as a stiffener that suppresses the bending of the bottom steel plate when placing concrete, and the headed stud has a function as a detent for synthesizing the bottom steel plate and concrete. ing.

  Patent Document 1 discloses a composite floor slab in which a steel plate rib having a large number of holes (perforated steel sheet rib) is welded to a bottom steel plate to form a steel panel, and Patent Document 2 has a large number of holes. A composite floor slab is disclosed in which a U-rib is welded to a bottom steel plate to form a steel panel.

JP-A-9-221706 JP 2004-92384 A

  However, in these composite floor slabs, the rib material is projected on the bottom steel plate by fillet welding, and the rib material is attached only to one side of the bottom steel plate, so that the distortion caused by welding is large, so that There was a problem that it was necessary to correct the strain, and it took a lot of work to manufacture the steel panel.

  In particular, the synthetic floor slab of Patent Document 1 requires drilling in the rib material, and in any case, a steel material having a plate thickness larger than that of the bottom steel plate is used for the rib material in order to provide sufficient rigidity. Or a large number of rib members are arranged, and there is a problem that the amount of steel material used in the entire steel panel is large and economical.

  The present invention has been made to solve the above-mentioned problems. By using through stud welding, the number of work steps and the amount of welding are greatly reduced, and a steel panel of a composite floor slab is manufactured in a short period of time and economically. The object is to provide a steel / concrete composite floor slab that can be made.

Claim 1 Steel-concrete composite slab as claimed includes a bottom steel plate, and a plurality of ribs material was attached et at predetermined intervals on the the bottom steel plate, predetermined intervals on the bottom steel plate between the ribbing In the steel-concrete composite floor slab composed of a plurality of headed studs attached to the base and concrete placed on the bottom steel plate, the rib material protrudes on both sides of the rib material body and the rib material body. is formed from has been fin piece, said fin piece is pierced stud welded onto the formed from sheet steel and the bottom steel plate, the headed stud and characterized by being a stud welded onto the bottom steel plate To do.

  In the present invention, the rib material is composed of a rib material main body and a fin piece, and in particular, the fin piece is formed from a thin steel plate having a thickness of about 1.6 mm that can be through stud welded. It can be attached to the top much faster than conventional fillet welding, etc., so that a steel plate of a composite floor slab can be manufactured in a short period of time.

  Through stud welding does not use a welding rod or a welding wire, and can be welded together with a stud if the steel sheet is about 1.6 mm thick using the stud itself as a welding material. For this reason, the time required for welding per stud is extremely short, and the influence of the welding heat on the bottom steel plate is reduced by welding a plurality of studs on the steel plate at an interval. Since it is small and the correction of distortion after welding can be greatly reduced, it is possible to reduce the number of manufacturing steps and to manufacture a steel panel of a composite floor slab in a short period of time.

The steel / concrete composite floor slab according to claim 2 is the steel / concrete composite floor slab according to claim 1, wherein the rib material has a hat-shaped cross section from the rib material main body and fin pieces protruding on both sides thereof. It is characterized by being formed .

  In the present invention, the rigidity of the rib material, and consequently the steel panel as a whole, is increased by making the rib material particularly a hat shape in cross section.

The steel / concrete composite floor slab according to claim 3 is the steel / concrete composite floor slab according to claim 1 or 2, wherein the rib member has a U-shaped cross section, a U-shaped cross section, a V-shaped cross section, and a cross section. which is characterized by comprising formed from an I-shaped shape or T-shaped cross section formed in the shape rib material body and projecting from the fins pieces on both sides, rib member, therefore, synthetic floor slab The overall rigidity of the steel panel is increased. If the rib material main body is a U-shaped cross-section or a U-shaped cross-section, it can be said that the rib material constitutes a hat shape together with the fin pieces protruding on both sides.

The steel / concrete composite floor slab according to claim 4 is the steel / concrete composite floor slab according to claim 1, wherein the rib member is one or a plurality of sandwiched between the thinly folded thin steel plate and the thin steel plate. It is characterized by being formed from a rib material main body made of a rod-shaped member and fin pieces projecting on both sides thereof .

The steel / concrete composite floor slab according to claim 5 is used as it is as a steel panel in the steel / concrete composite floor slab according to any one of claims 1 to 4 by making the rib material body into a hollow cross-sectional shape. It is possible to reduce the weight of the floor slab, or, as will be described later, it is possible to increase the rigidity of the rib material and the steel panel as a whole by filling mortar, concrete, and rod-shaped members in the hollow. This is suitable when the entire rib member is a thin steel plate.

  In the present invention, by making all the rib material main body and the fin pieces into thin steel plates, the entire rib material can be easily manufactured by press molding, and the weight of the entire steel panel can be reduced.

  In addition, since the rib material can be press-molded, corrugated protrusions and embossed irregularities can be provided on the rib material body to easily increase the rigidity of the rib material and adhesion to the concrete. Moreover, this makes the composite degree of the post-cast concrete and the steel panel more firm, and can improve the fatigue durability of the composite slab.

  As a method of molding the rib material, in addition to press molding, roll forming molding can also be applied.In the case of roll forming molding, it can cope with complicated rib shapes and is suitable for mass production of rib materials, There are advantages such as reduction in manufacturing cost.

The steel / concrete composite floor slab according to claim 6 is the steel / concrete composite floor slab according to any one of claims 1 to 3, wherein the rib material body is formed of a shape steel. In particular, since the fin pieces are thin steel plates, square steel pipes and flat steels such as flat steel can be easily attached by through stud welding.

The steel / concrete composite floor slab according to claim 7 is the steel / concrete composite floor slab according to any one of claims 1 to 6, wherein the rib material body has a hollow cross section or the rib material and the bottom steel plate have a closed cross section. A rib is formed by filling the hollow cross-section or the closed cross-section with a filler, and filling the hollow cross-section or the closed cross-section with mortar, concrete, a rod-like member, or the like as a filler. The rigidity of the entire material and further the steel panel can be increased, and is particularly suitable when the entire rib material is a thin steel plate.

  According to the present invention, in a composite floor slab comprising a bottom steel plate, a plurality of rib members projecting on the bottom steel plate and stoppers, and concrete cast on the bottom steel plate, the rib material is particularly a rib. It consists of a fin body consisting of a main body and a thin steel plate, and the fin piece is welded to the bottom steel plate by through stud welding, so that the rib material is marked on the bottom steel plate more than conventional fillet welding etc. It can be installed quickly, and the distortion of the bottom steel plate due to stud welding is small, so the correction of distortion after welding can be greatly reduced. There is also an effect that it can be manufactured with.

  In addition, the rib material has a cross-sectional shape such as a hat shape, a U shape, and a T shape, and further, mortar or the like is filled in the hollow cross section formed by the rib material itself or the rib material and the bottom steel plate, The rigidity of the rib material, and hence the entire steel panel, can be increased, and the amount of steel used can be reduced.

It is a top view which shows one Embodiment of this invention and shows the steel panel of the synthetic floor slab laid on the main girder. A synthetic floor slab is shown, (a), (b) is a sectional view taken along the line II in FIG. FIG. 2 is a cross-sectional view of the roll line in FIG. 1, showing a joint portion between the main beam and the composite floor slab. (A), (b) is a partial perspective view which shows a hat-type rib material. The modification of a rib material is shown, (a), (b) is sectional drawing which shows an I-shaped rib material together. The modification of a rib material is shown, (a), (b) is sectional drawing which shows a U-shaped rib material and a V-shaped rib material, respectively. The modification of a rib material is shown, (a), (b) is sectional drawing which shows a rib material with a protrusion together. The modification of a rib material is shown, (a), (b) is sectional drawing which shows a T-shaped rib material together. A modification of a rib material is shown, (a) is a sectional view showing a rib material in which the rib material body is made of flat steel, and (b) is a sectional view showing a rib material in which the rib material body is made of a square steel pipe. It is sectional drawing which shows an example of the conventional synthetic floor slab.

  1 to 4 show an embodiment of the present invention. In the figure, a bottom steel plate 2 is laid on a plurality of main girders 1 and 1 spanned in parallel at a predetermined interval. A plurality of hat-shaped rib members 3 are laid as rib members continuously in parallel to the direction perpendicular to the bridge axis and at predetermined intervals in the bridge axis direction.

  Further, a plurality of headed studs 4 are attached to the bottom steel plate 1 between the hat-shaped rib members 3 and 3 at predetermined intervals in the bridge axis direction and the bridge axis perpendicular direction as stoppers (in FIG. 1, studs). 4 is only partially shown).

  Then, a plurality of main reinforcing bars 5a and distribution reinforcing bars 5b are continuously arranged between the plurality of hat-type rib members 3 and 3 in the bridge axis direction and the direction perpendicular to the bridge axis, and the concrete 6 is cast to form the composite floor. Version 7 is configured.

  The bottom steel plate 2 is generally formed from a thick steel plate having a thickness of about 6-9 mm, and the hat-type rib member 3 is integrally formed from a thin steel plate having a thickness of about 1.6 mm by press molding or the like.

  In particular, the hat-shaped rib member 3 is formed by bending a thin steel plate into a cross-sectional hat shape, and a rib member body 3a formed in a U-shaped cross section and fins protruding horizontally at the lower end portions on both sides thereof. The pieces 3b and 3b are provided.

  Further, the hat-shaped rib member 3 has fin pieces 3b, 3b on both sides attached to the bottom steel plate 2 by deck plate penetration stud welding using a plurality of studs 8.

  In this case, the hat-type rib members 3 are attached at intervals of about 500 mm to 800 mm in the bridge axis direction, and the studs 8 are projected at predetermined intervals in the direction perpendicular to the bridge axis. The headed stud 4 is attached on the bottom steel plate 2 by stud welding.

  The penetration stud welding is welding in which the stud 8 itself is pressed against the fin piece 3b of the hat-type rib member 3 and welded together with the fin piece 3b on the bottom steel plate 2 without using a welding rod or a welding wire. The hat-type rib member 3 can be attached to the bottom steel plate 2 very efficiently in a very short time, and the influence of welding heat on the bottom steel plate 2 is small.

  In the configuration as described above, the bottom steel plate 2, the hat-shaped rib member 3 and the headed stud 4 are integrally processed to a predetermined size as a steel panel 9 in the factory, and the steel panel 9 manufactured in the factory is It is laid adjacent to each other on the main girders 1 and 1 at the site.

  Further, as shown in FIG. 3, a haunch 2 a and a notch hole 2 b are respectively formed at positions where the bottom steel plate 2 comes into contact with the main girders 1. The haunch 2a is formed continuously in the bridge axis direction, and a plurality of notches 2b are formed at predetermined intervals in the bridge axis direction.

  Reference numeral 17 denotes a haunch steel plate forming the haunch 2 a, and the haunch steel plate 17 is attached to the lower side of the bottom steel plate 2 by a threaded stud, a washer and a nut 18.

  In this case, a threaded stud projects from the bottom of the bottom steel plate 2, and one end of the haunch steel plate 17 is fixed to the threaded stud by a washer and a nut fastened to the threaded stud. The side rides on the main girder 1. The haunch steel plate 17 may be formed of a steel plate thinner than the bottom steel plate 2.

  Then, a plurality of main girder studs 10 project from positions corresponding to the notch holes 2 b of the main girder 1, and the main girder studs 10 are fixed in the concrete 6 placed on the bottom steel plate 2. Thus, the composite floor slab 7 is integrally coupled to the main beam 1 on the main beam 1.

  Moreover, the hat-shaped rib material 3 is not only capable of mass production by press molding from a thin steel plate, but also by providing a predetermined rigidity to the bottom steel plate 2 and forming a hollow cross section with the bottom steel plate 2. The weight reduction of the steel panel 9 can be achieved.

  Further, since press molding is possible, the adhesion force of the concrete 6 cast on the bottom steel plate 2 can be increased by providing a corrugated projection 3c on the surface as shown in FIG. In addition, the degree of synthesis of the concrete 6 and the steel panel 9 can be made firmer, and the fatigue durability of the composite floor slab 7 can be improved.

  Furthermore, since the hat-shaped rib member 3 is formed of a thin steel plate, it may be considered that the rigidity required as a stiffening material at the time of placing the concrete 6 cannot be satisfied. In such a case, FIG. As shown in FIG. b), a hat-type rib material is formed by filling and hardening concrete or mortar 11 in a space (hollow part) formed between the rib material body 3a of the hat-type rib material 3 and the bottom steel plate 2. 3 rigidity can be ensured.

  Depending on the situation, the filling of concrete or mortar 11 is performed at a factory where the steel panel 9 is manufactured, or after the steel panel 9 is carried into the construction site, it is performed prior to placing the floor slab concrete.

  5 to 9 show modifications of the rib member according to the present invention, which will be described in order.

FIG. 5 (a) shows an I-shaped rib member. The I-shaped rib member 12 is formed by simply folding a thin steel plate twice, and is formed at a rib member main body 12a having an I-shaped cross section and lower end portions on both sides thereof. Fins 12b, 12b are formed by bending the end of the thin steel plate horizontally. The I-shaped rib 12 is attached to the fin pieces 12b and 12b on the bottom steel plate 2 by through stud welding using a plurality of studs 8.

  According to the I-shaped rib member 12, it can be manufactured very simply by simply bending a thin steel plate, and can be manufactured on site as needed.

  FIG. 5B shows the same I-shaped rib material as FIG. 5A, and in particular, a flat steel 13 is vertically sandwiched inside a rib body 12a in which a thin steel plate is double-folded. The thin steel plate and the flat steel 13 are integrated by simply caulking the thin steel plate.

  In addition, the thin steel plate and the flat steel 13 can be integrated more firmly by applying an adhesive such as an epoxy resin to the contact surface between the thin steel plate and the flat steel 13.

  The I-shaped rib member 12 has fin pieces 12 b and 12 b attached to the bottom steel plate 2 by through stud welding, and the flat steel 13 is not particularly welded to the bottom steel plate 2. According to the I-shaped rib member 12, the rigidity of the rib member main body 12a is increased, so that it is possible to cope with longer floor slab supports.

  5 (b) has a configuration in which flat steel is filled in a closed cross section formed by a rib material formed in a hat shape (the rib material main body is a U-shape) and a bottom steel plate. You can also see it.

  6 (a) and 6 (b) show a U-shaped rib material and a V-shaped rib material, respectively. In particular, the rib material body 12a is formed by bending a thin steel plate into a U-shaped section and a V-shaped section, respectively. The fin pieces 12b, 12b on both sides are formed and attached to the bottom steel plate 2 by through stud welding using a plurality of studs 8, respectively. Moreover, concrete or mortar 14 is filled in the hollow portion as necessary.

  In the above configuration, according to the U-shaped rib material, there is an advantage that stress concentration hardly occurs in the concrete 6 placed on the floor steel plate 2 and the durability of the floor slab is further improved.

  Further, according to the V-shaped rib material, since a pseudo truss is formed in the bridge axis direction, there is an advantage that stability against buckling can be improved even when the rib material body 12a is hollow.

  6A and 6B can also be regarded as a hat shape as the shape of the rib material including the fin material.

  7 (a) and 7 (b) show rib materials with projections, and in particular, the rib material body 12a is formed by folding a thin steel plate twice and sandwiching one or more rod-like members 15 inside thereof. .

  The rod-shaped member 15 is made of round steel, square steel, reinforcing bar, or the like, and the thin steel plate and the rod-shaped member 15 are integrated by strongly caulking the thin steel plate.

  In addition, the thin steel plate and the rod-shaped member 15 can be integrated more firmly by applying an adhesive such as an epoxy resin to the contact surface between the thin steel plate and the rod-shaped member 15.

According to the rib member 12 with protrusions, the rigidity of the rib member main body 12a can be increased, so that it can cope with longer floor slab supports, and one or more bead protrusions on the surface of the rib member main body 12a. As a result, the effect of anchoring the steel panel 9 to the concrete 6 and the adhesion between the rib material main body 12a and the concrete 6 are enhanced, thereby giving the rib material 12 with protrusions a function of preventing slippage. Can do.

  8 (a) and 8 (b) show a T-shaped rib material, and in particular, the rib material main body 12a is formed by double-folding a thin steel plate and formed into a T-shaped cross-sectional shape composed of a flange portion and a web portion. Has been. In particular, in the T-shaped rib member illustrated in FIG. 8B, the flat steel 13 is horizontally sandwiched inside the flange portion.

  The thin steel plate and the flat steel plate 13 are integrated by simply caulking the thin steel plate. By applying an adhesive such as an epoxy resin to the contact surface between the flat steel plate 13 and the thin steel plate, the flat steel plate 13 and the thin steel plate 13 are more It can be firmly integrated.

  According to the T-shaped rib material 12, the rigidity of the rib material can be easily increased by having the flange portion at the upper end portion of the I-shaped web portion, and the flat steel 13 is provided inside the flange portion. By sandwiching, the rigidity of the rib material can be further increased.

  9 (a) and 9 (b) show a modification of the rib material, and the rib material 12 is composed of a rib material body 12a made of a shape steel such as a flat steel or a square steel pipe and a fin piece 12b made of a thin steel plate. Has been.

  Of these, FIG. 9 (a) shows a rib material in which the rib material body 12a is made of flat steel, and FIG. 9 (b) shows a rib material in which the rib material body 12a is made of a square steel pipe. Also, it is attached by fillet welding on a fin piece 12b made of a thin steel plate.

  As the rib member main body 12a, for example, a perforated steel plate rib having a plurality of holes in a flat steel, a grooved steel, a square steel pipe or the like is used.

  In addition, when a flat steel or a square steel pipe is attached to the thin steel plate by fillet welding to form the rib member 12, correction is required, but the thin steel plate used as the fin piece 2b is smaller in size than the bottom steel plate of the steel panel. Also, since the plate thickness is thin and easy to correct, there is an advantage that the number of manufacturing steps of the steel panel can be reduced compared to mounting flat steel or the like as a rib material on the bottom steel plate by fillet welding.

  The present invention can significantly reduce the number of work steps and the amount of welding, and can produce a steel panel of a composite floor slab in a short period of time and economically.

DESCRIPTION OF SYMBOLS 1 Main girder 2 Bottom steel plate 2a Haunch 2b Notch hole of bottom steel plate 3 Hat type rib material 3a Rib material main body 3b Fin piece 3c Protrusion 4 Head stud 5a Main reinforcement 5b Power distribution reinforcement 6 Concrete 7 Synthetic floor slab 8 Stud 9 Steel Panel 10 Main girder stud 11 Concrete and mortar 12 Rib material 12a Rib material body 12b Fin piece 13 Flat steel 14 Concrete or mortar 15 Rod member 16 Steel plate rib 17 Haunch steel plate 18 Threaded stud, washer and nut

Claims (7)

A bottom steel plate, and a plurality of ribs material was attached et at predetermined intervals on the the bottom steel plate, and a plurality of headed studs mounted at predetermined intervals on the bottom steel plate between the ribs material, said bottom in the steel-concrete composite slabs comprising a Da設to concrete on the steel sheet, the rib member is formed of a fin piece projecting on either side of the rib member body and the rib material body, said fins piece A steel / concrete composite floor slab formed from a thin steel plate and through-welded to the bottom steel plate, and the headed stud is stud-welded to the bottom steel plate . The steel / concrete composite floor slab according to claim 1, wherein the rib material is formed in a hat-shaped cross section from a rib material main body and fin pieces projecting on both sides thereof . The rib material has a U-shaped cross section, a U-shaped cross section, a V-shaped cross section, an I-shaped cross section, or a T-shaped cross section, and fin pieces projecting on both sides thereof. The steel / concrete composite floor slab according to claim 1, which is formed from The rib material is formed of a rib material body composed of a thin steel plate folded twice and one or a plurality of rod-shaped members sandwiched inside the thin steel plate, and fin pieces projecting on both sides thereof. The steel / concrete composite deck according to claim 1. The steel / concrete composite floor slab according to any one of claims 1 to 4 , wherein the rib material main body is formed in a hollow cross-sectional shape. The steel / concrete composite slab according to any one of claims 1 to 3, wherein the rib member main body is formed of a shape steel. Rib material body is and the bottom steel hollow section or rib material to form a closed cross section, according to any one of claims 1 to 6, fillers hollow cross section or closed section, characterized in that it is filled Steel / concrete composite floor slab.

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