JP4146314B2 - Synthetic floor slab - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an improvement of a synthetic floor slab in which steel and concrete are integrated by attaching a gibber material such as a rib or a reinforcing bar on a floor steel plate and placing concrete on the floor steel plate in the field. It is.

  Conventionally, as a composite structure of a steel girder and concrete, a composite plate structure in which a concrete plate is placed on a steel girder and a floor slab structure in which a steel girder is wrapped with concrete are known.

  The former composite plate structure is equipped with a stopper such as a stud gibber on the upper surface of the upper flange of the H-section steel girder, and the latter floor slab structure is also a T-section steel girder embedded in concrete. A slip stopper is attached to the upper surface of the flange.

  The structure of the slip stopper provided on the upper surface of the flange of the steel girder having a T cross section is not a floor slab structure, but as shown in Patent Document 1, a perforated steel sheet in which through holes are continuously opened is formed in an H shape. Or a steel rib with a T-shaped cross section provided in the form of a vertical rib perpendicular to the top surface of the upper flange of the steel girder, or as shown in FIG. Various things are known.

JP-A-11-293626

  In general, the floor slab bridge is used at a low girder height, so that the disadvantage is that the deflection due to the live load is larger than other high girder composite structures. Therefore, the steel girder to be used is required to have a girder height as large as possible, and it is necessary to use one of the large displacement restraints between the steel girder and the concrete.

  All of the stoppers shown in Patent Document 1 are attached to the upper surface of the upper flange of a steel girder having an H-shaped or T-shaped cross section, and are intended to integrate the concrete plate and the steel girder. It has the following problems.

  First, among the above-mentioned displacement stoppers, a gibber in which a perforated steel plate is provided in the form of a vertical vertical rib on the upper flange surface of a steel girder with an H-shaped or T-shaped cross section, In the case of a gibber or the like that has a stud gibber projecting on the upper surface of the flange, these detents have a predetermined height by themselves, and the height of these detents is added to the upper surface of the flange. Including the steel cover thickness of steel bars and concrete placed in the center, a large length is required as the girder height, from the bottom end of the steel girder of H-shaped and T-shaped cross section to the thickness of the reinforcing bar and cover concrete thickness on the stopper. It will be said.

  Therefore, when a large-sized stopper such as a vertical rib or a stud is installed on the top surface of a steel girder flange with a T-shaped or H-shaped cross section, the flange position in the concrete girder is the compression side edge of the top surface of the concrete girder. As a result, the steel section approaches the neutral axis of the composite girder. This means that the composite effect of the steel girder flange cross section has been reduced, and as a result, the structure has a higher girder height. Therefore, when compared at the same girder height, the composite effect is reduced, the deflection is large, and the rigidity is high. It becomes a structure with low economic effect by not being obtained.

  As a means for solving the above-mentioned problems in the conventional composite floor slab, the steel girder of H-shaped or T-shaped cross section provided on the floor steel plate is attached to the concrete by the flange itself. By making it better and improving the adhesion to the concrete with the stopper provided under the flange, the steel girder cross section can be reduced, and an economical and effective composite structure can be obtained. The purpose is to provide such a composite floor slab.

  In the composite floor slab according to the present invention, as a specific means for that purpose, a large number of T-shaped ribs are arranged in parallel with each other via a web on the floor steel plate, and these T-shaped ribs are centered on the web. A large number of concrete through-holes are opened at predetermined intervals along the length of the flange on both left and right sides of the flange, and these through-holes are adjacent to each other when viewed from the plane. It is established so that it is aligned on the same reference line in the direction perpendicular to the length direction of the rib flange, and between the adjacent T-shaped rib flanges, the ends of the gibber reinforcing bar are inserted at right angles by bending both ends at right angles. The insertion end is connected and arranged so as to be inserted into the through hole of one T-shaped rib flange and the through hole of the other adjacent T-shaped rib flange.

  The length of the gibber reinforcing bar arranged between a pair of adjacent T-shaped ribs is that one insertion end of the gibber reinforcing bar is inserted into the left through-hole of one T-shaped rib flange, and the other insertion end is adjacent to the other. It is preferable that the length be inserted into the right through hole of the T-shaped rib.

  Regarding the length of the gibber reinforcing bar, as another form, one insertion end of the gibber reinforcing bar is inserted into the right side through hole of one T-shaped rib flange, and the other insertion end passes through the left side of the other adjacent T-shaped rib. It may be long enough to be inserted into the hole.

  Also, the insertion ends at both ends of the gibber rebar are inserted into the through-holes formed in the flange of the T-shaped rib, so that a vertical displacement stopper is formed between the lower surface of the flange and the floor steel plate. Preferably, it is configured.

  According to the composite floor slab of the present invention, the through holes are opened on both the left and right sides of the flange centered on the web of the T-shaped ribs, and both ends of the gibber reinforcing bars arranged on the upper surface of the flange are respectively in the through holes. When the concrete is placed on the floor steel plate by projecting deeply below the flange through the T-rib web and the concrete surrounded by the bottom surface of the flange, Engage with the inner peripheral surface of the through-hole, and at the height of the flange through-hole, exert a uniform displacement-preventing action in the plane direction. The end exerts an anti-slipping action, and further above the flange, the gibber rebars exert an anti-slipping effect, which enhances the integrity of the T-shaped rib and the concrete and is durable. It can be a high structure.

  Of course, since the principal part is arranged above each T-shaped rib in the state where the insertion ends of both ends are engaged in the through-holes, the above-mentioned gibel reinforcing bars are the reinforcing bars perpendicular to the bridge axis. As a result, on the upper surface of the flange of the T-shaped rib, as in the steel girder shown in Patent Document 1, a protrusion-like shape like a vertical rib with a through hole formed on the upper surface of the flange. There is no need to provide a slip stopper, and the amount of concrete cover on the flange of the T-shaped rib can be set low, so that the overall girder height can be lowered. Therefore, a structure with high economic effect can be obtained.

  The gibber rebar is set to such a length that it is arranged between adjacent T-shaped rib flanges, but the length of the main part is set so that one insertion end at both ends penetrates the left side of one T-shaped rib flange. When the length is such that the other insertion end is inserted into the right through hole of the other T-shaped rib flange adjacent to the other insertion end, The left end and the right end are superposed in the front-rear direction on the flange without any gaps, so that the linkage of each gibel rebar on the flange is enhanced, and the swing of each gibel rebar is suppressed and the concrete is restrained. Can increase the sex.

  As described above, it is sufficient that the gibber reinforcing bars are set to such a length that they are arranged between the T-shaped rib flanges adjacent to each other. For example, the length of the main part is made shorter than that of the above-mentioned gibber reinforcing bars. Thus, one insertion end at both ends is inserted into the right through hole of one T-shaped rib flange, and the other insertion end is inserted into the left through hole of the other adjacent T-shaped rib flange. Well, in this case, each of the dibel rebars arranged between the T-shaped rib flanges is arranged without overlapping the left and right ends in the front-rear direction on the flange. There is no change in the fact that the upper surface of the T-shaped rib exhibits a slip-preventing action.

  As the length of the main part of the gibber reinforcing bar arranged between the flanges of a pair of adjacent T-shaped ribs, for example, one insertion end of the gibber reinforcing bar is inserted into the left through hole of one T-shaped rib flange. In this case, the length is preferably such that the other insertion end is inserted into the right through hole of the other adjacent T-shaped rib. In the case where the gibber reinforcing bar has such a length, the ends of the gibber reinforcing bars inserted into the respective through holes are overlapped in the front-rear direction at the right end and the left end on the flange of the intermediate portion T-shaped rib. As a result, the linkage of each gibber reinforcing bar is exhibited over the upper surfaces of all T-shaped ribs.

  Next, the structure of the composite floor slab according to the present invention will be described with reference to an embodiment shown in the drawings. As shown in FIG. 1, a large number of T-shaped ribs 2 are formed in a direction parallel to the bridge axis on the floor steel plate 1. By welding the lower end of 3, they are arranged at predetermined intervals.

  Further, in these T-shaped ribs 2, a large number of concrete through holes 5 are opened at predetermined intervals along the length direction of the flange 4 on both the left and right sides of the flange 4 with respect to the web 3. In addition, these through holes 5 are formed so as to be aligned on the same reference line EE in the direction orthogonal to the length direction of the T-shaped rib flanges 4 adjacent to each other when viewed from the plane.

  As shown in FIG. 2, the size of the through hole 5 is preferably such that the diameter of the hole is about ¼ to ½ of the left and right width W1 of the flange 4 with the web 3 as the center. In addition, it is preferable that the space | interval H along the length direction of the flange 4 of each through-hole 5 is provided in the range which is the same as the width W2 of the flange 4, or about 2 times.

  The direction perpendicular to the length direction of the T-shaped ribs 2 is on the reference line EE where the through holes 5 are opened on the flanges 4 of the T-shaped ribs 2 arranged in parallel at a predetermined interval. The gibber rebar 6 is arranged (in the direction perpendicular to the bridge axis). The gibber rebar 6 has a length such that the main portion 6a can connect between a pair of adjacent T-shaped ribs 2 and 2 and is inserted into the through hole 5 of the flange 4 at both ends. The insertion ends 6 b and 6 c are bent at right angles as described above, and these insertion ends 6 b and 6 c are inserted into the through holes 5 of the respective T-shaped ribs 2.

  In the case of the embodiment shown in FIGS. 1 to 4, since the length of the main portion 6a of the gibber reinforcing bar 6 is slightly longer, the main portion 6a has one insertion end 6b on the left side of the flange 4 in one T-shaped rib 2a. The other insertion end 6c is inserted into the right through hole 5b of the flange 4 in the other adjacent T-shaped rib 2b.

  Therefore, as shown in FIG. 2, when the relationship between the gibber reinforcing bar 6 and the three T-shaped ribs 2 a, 2 b, 2 c on the left side, the middle part, and the right side adjacent to each other is seen, the left T-shaped rib 2 a and the middle The gibber rebar 6 connecting the portion T-shaped rib 2b has a left insertion end 6b inserted through the left through-hole 5a of the left T-shaped rib 2a and a right insertion end 6c formed of an intermediate portion T-shaped rib. 2b is inserted through the right through-hole 5b, and on the other hand, the gibber rebar 6 connecting the intermediate T-shaped rib 2b and the right T-shaped rib 2c has a left insertion end 6b of the intermediate T-shaped rib 2b. The right insertion end 6c is inserted into the right through hole 5b of the right T-shaped rib 2c. As a result, the right end and the left end of both the gibber reinforcing bars 6 and 6 are arranged so as to overlap each other on the flange 4 of the intermediate portion T-shaped rib 2b in the front-rear direction.

  In addition, in the space between one row of gibber reinforcing bars 6 arranged along the through hole 5 on the same reference line EE in the flange 4 and another row of gibber reinforcing bars 6 arranged in the same manner. The reinforcing bars 7 are arranged in parallel, and the reinforcing bars 8 are further arranged on the reinforcing bars 7 in a direction parallel to the T-shaped rib 2.

  FIG. 5 shows another embodiment of the gibber rebar 6. In this case, the gibber reinforcing bar 16 has a length of the main portion 16a somewhat shorter than that of the above-described embodiment as compared with the gibber reinforcing bar 6 of the embodiment shown in FIGS. An insertion end 16b provided at one end of the flange 14 is inserted into a through hole 15b on the right side of the flange 14 in one T-shaped rib 12a, and the other insertion end 16c penetrates the left side of the flange 14 in the other T-shaped rib 12b. It is inserted into the hole 15a.

  Therefore, each of the Giber rebars 16, 16 arranged so as to be aligned on the same reference line EE line of each T-shaped rib 12, the right end of one Giber rebar 16 and the left end of the other Giber rebar 16 are flange 14. They are arranged so that they do not overlap in the front-rear direction. However, each of the gibber reinforcing bars 16 is inserted into the through-hole 15 of the T-shaped rib 12 at both ends and maintains the integrity with the T-shaped rib 12. There is not much difference from the case of the above embodiment in that

  When the concrete 9 is placed on the floor steel plate 1, the concrete 9 wrapped in the space surrounded by the web 3 of the T-shaped rib 2 and the lower surface of the flange 4 has a large number of through holes 5 shown in FIG. 3. Engage with the inner peripheral surface, and at the height position of the flange through-hole 5, an even displacement-preventing action in the horizontal plane direction, and below the flange 4, the insertion ends 6 b and 6 c that project downward from the through-hole 5 are used as a diver. In the upper part of the flange 4, the gibber rebar 6 exerts a detent function, and the detent function is given to three surfaces having different heights. Even when a shocking dynamic load is loaded, the unity with the concrete 9 is enhanced, and a highly durable structure with no fear of peeling can be obtained.

  In the composite floor slab of the present invention, the through hole is formed in the flange of the T-shaped rib, and both ends of the gibber reinforcing bar arranged on the upper surface of the flange are projected to the lower surface of the flange through the through hole. The placed concrete engages with the inner peripheral surface of the through hole, and an even displacement preventing action is exerted in the plane direction at the height position of the through hole. Since it acts as a right-angle reinforcing bar, it is not necessary to provide a stopper with protrusions on the top surface of the flange of the T-shaped rib, it is sufficient to simply arrange the reinforcing bars, and the amount of concrete cover is low, which is low. Synthetic floor slabs can be constructed and the availability is great.

The fragmentary perspective view which shows the structure of the composite floor slab which concerns on this invention. The top view which shows the structure of the synthetic floor slab which concerns on this invention. Sectional drawing in the AA of FIG. Sectional drawing in the BB line of FIG. The top view which shows the structure of another Example of this invention. Sectional drawing in the CC line | wire of FIG.

Explanation of symbols

1: floor steel plate,
2: T-shaped rib,
3: Web,
4: flange,
5: through hole,
6: Giber rebar,
6a: Reinforcing bar main part,
6b, 6c: Insertion ends of both ends of the reinforcing bar,
7, 8: Reinforcing bars
9: Concrete,

Claims (4)

A number of T-shaped ribs are arranged on the floor steel plate in parallel with each other via webs,
In these T-shaped ribs, a large number of concrete through holes are opened at predetermined intervals along the length of the flange on both the left and right sides of the flange centered on the web. Established to be aligned on the same reference line in the direction perpendicular to the length direction of each T-shaped rib flange adjacent to each other when viewed from the plane,
Between the T-shaped rib flanges adjacent to each other, gibber reinforcing bars having both ends bent at right angles and provided with insertion ends are connected to the through holes of one T-shaped rib flange and the other adjacent T-shaped rib flange. A composite floor slab characterized by being connected and arranged so as to be inserted into a through hole of a shaped rib flange.   The length of the gibber reinforcing bar arranged between a pair of adjacent T-shaped ribs is such that one insertion end of the gibber reinforcing bar is inserted into the left through-hole of one T-shaped rib flange, and the other insertion end is adjacent to the other. The composite floor slab of claim 1, which has a length such that it can be inserted into the right through hole of the T-shaped rib.   The length of the gibber reinforcing bar arranged between a pair of adjacent T-shaped ribs is such that one insertion end of the gibber reinforcing bar is inserted into the right through-hole of one T-shaped rib flange, and the other insertion end is adjacent to the other The composite floor slab of claim 1, having a length such that it can be inserted into the left through hole of the T-shaped rib.   The longitudinal displacement stopper is formed between the lower surface of the flange and the floor steel plate by inserting the insertion ends of both ends of the gibber reinforcing bar into a through hole formed in the flange of the T-shaped rib. The synthetic floor slab according to claim 3.

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