JP6042622B2 - Floor slab structure using sandwich type composite slab panel - Google Patents

Description

  The present invention relates to a floor slab structure that uses sandwich type composite floor slab panels and omits joints between panels or has a simple joint structure, and is mainly used for new floor slab construction such as road bridges or replacement in existing floor slabs. Used for construction.

  The conventional cast-in-place slab, which is a conventional technology, is not suitable for construction conditions that require rapid construction because it requires a long construction period for on-site reinforcement work and concrete construction curing.

  On the other hand, various precast slabs and steel / concrete composite floor slabs have been developed and constructed for the purpose of labor saving and process shortening (see, for example, Patent Document 1, Patent Document 2, etc.).

  With regard to the joint portion of the precast floor slab, for example, in Patent Document 3 and Patent Document 4, a groove is formed in the abutting portion between the precast floor slabs, and the reinforcement of each floor slab is formed in a loop shape in the groove. A joint structure is disclosed in which mortar is filled by, for example, projecting and superimposing parts and arranging main bars in a direction perpendicular thereto.

  Moreover, regarding the joint part of the precast composite floor slab, for example, in Patent Document 5, the bottom steel plates protruding from the joint part are abutted, and the end of the steel bar projecting from the reinforced concrete part on the bottom steel plate and the steel made through these are penetrated. A structure is disclosed in which a joint portion formed of a belt-like reinforcing plate, a fixing nut member, or the like is formed, and then the interstitial concrete is cast.

JP 2002-013108 A Japanese Patent No. 4803791 JP 2000-328704 A JP 2009-264040 A JP 2011-021362 A

In the inventions described in Patent Documents 3 to 5,
(1) When constructing joints, there is a problem that reinforcement of joints and concrete construction are required, and the joint work process takes time.
(2) The main girder is fixed with cast-in-place concrete and a stud gibber installed on the main girder, and the concrete is hardened and joined, but there is a problem that it takes time to develop strength.
(3) In the unlikely event that the slab is damaged, super-rapid construction is required, but it takes a considerable amount of time for the concrete cutting work and the work steps (1) and (2) above. There is a problem that it takes time.
(4) In addition to this, there is a problem of water intrusion from the upper surface or the joint part of each part. In this case, there is a problem of promoting deterioration in durability.

  The present invention is intended to solve the problems in the prior art as described above, and has a high rigidity as a floor slab of a sandwich-type composite floor slab panel. By rationalizing the joint structure using the characteristics of small deformation, The purpose is to provide a floor slab structure that can be super-rapidly constructed and has excellent durability.

The floor slab structure using the sandwich type composite floor slab panel of the present invention has a sandwich type composite floor slab panel in which a steel shell provided with an upper steel plate and a lower steel plate is filled with concrete. It is a floor slab structure that is installed side by side in the direction, and is characterized in that no joint member is provided between the butt portions in the bridge axis direction and / or the bridge axis direction between the sandwich type composite floor slab panels. is there.

In the structure where two sandwich type composite floor slab panels are installed in the most general direction perpendicular to the bridge axis and this is continuous in the bridge axis direction, the structure of the continuous part between adjacent sandwich type composite floor slab panels is as follows:
(1) If no joint member is provided in either the direction perpendicular to the bridge axis or the direction of the bridge axis,
(2) When the direction perpendicular to the bridge axis is joined with a simple joint member and no joint member is provided in the bridge axis direction,
(3) When no joint member is provided in the direction perpendicular to the bridge axis, and a simple joint member is used in the bridge axis direction,
(4) bridge axis perpendicular, regardless bridge axis direction, have field if such is provided a coupling member for some,
There can be.

The present invention does not mean that a sandwich-type composite floor slab panel must be used for all floor slabs for a floor slab structure continuous in the bridge axis direction. In addition, as in the case of (4) above, if necessary, a simple joint can be used for joints between some sandwich-type composite floor slab panels, or joints between sandwich-type composite floor slab panels in a specific section. The case where it joins not by a member but by the joint member (including the conventionally used joint member) which transmits the bending action as a floor slab is also included.

  In the case where three or more sandwich type composite floor slab panels are installed in a direction perpendicular to the bridge axis, the same can be basically considered.

  In the present invention, a joint member is not provided between the abutting portions of the sandwich type composite floor slab panels, or the abutting portions are joined by a simple joint member that does not substantially transmit the bending action as a floor slab. In the case of sandwich-type composite floor slab panels, the upper and lower steel plates are sandwiched between the upper and lower steel plates so that bending rigidity is high, and composite slabs made of ordinary reinforced concrete or steel plates only on the bottom side are used. This is because the amount of deflection or the amplitude is smaller than that of the floor slab, so that the level difference that may occur at the abutting portion is suppressed to a level that does not affect the running of the vehicle.

  That is, in the conventional structure in which floor slab panels are installed to face each other, it has been considered necessary to integrate them via a joint member. However, a joint member is not provided between the abutting portions or a simple joint. Even when joined by members, if the level difference generated at the abutting portion by a wheel load by the traveling vehicle is small, a structure that does not substantially transmit the bending action is not only structurally realized as a floor slab structure, but also a road bridge, etc. The function as can be fully exhibited.

  The fact that the bending action is not substantially transmitted means that the design can be performed while ignoring the transmission of the shearing force and the bending stress, and it does not mean that the transmission of the bending action must be excluded. In relation to road pavement, etc. on sandwich type composite floor slab panels, a thin steel plate for simply joining the abutment parts of sandwich type composite floor slab panels or maintaining the continuity of road pavement on the abutment parts Or a sheet material or the like may be laid.

  For fixing to the main girder of the bridge, for example, if a floor slab panel joining member for securing to the main girder of the bridge is provided on the lower surface side of the lower steel plate of the sandwich type composite floor slab panel, the floor slab panel joining member is used. It is possible to fix the main girder of the bridge.

  In that case, the work on site is greatly compared with the floor slab structure in which gibbels such as stat bolts are infused on the upper flange of the main girder, which has been used in the past, and is integrated with the floor slab with cast-in-place concrete. It is simplified and the construction period can be shortened remarkably.

  As the floor slab panel joining member, for example, one obtained by cutting a shape steel can be used. If bolt joining is used, the efficiency of construction at the site can be further improved.

  Sandwich-type composite floor slab panels are first fixed with steel shells on the main girder and filled with concrete on site, and precast floor slab panels filled with concrete in steel shells at the factory and cured. The former is advantageous in that the weight at the time of construction is small, but in the case of ultra-rapid construction in which the floor plate panel is replaced in a short period of time, particularly in the case of rapid construction, particularly partial repair work, the latter Precast floor slab panels are advantageous.

  Since the sandwich type composite floor slab panel has high rigidity as a floor slab, the stress acting on the floor slab is small, and the deflection caused by the wheel load when the vehicle travels is also small. It is possible to omit the joint structure arranged in the perpendicular direction or to cope with a simple structure.

  In the bridge axis direction, sandwich-type composite floor slab panels are abutted and joint members are not provided in the same way, or the joints are joined with simple joint members that do not substantially transmit the bending action as a floor slab. By doing so, a stable structure can be obtained as the entire floor slab structure.

  Since the sandwich type composite floor slab panel has high rigidity as the floor slab, the load bearing capacity as the overhang structure is large, and therefore, the joint between the main girders can be omitted or it can be handled with a simple structure. Moreover, it is possible to replace the original structure of the span between the main girders with an overhang structure.

  Since the sandwich type composite floor slab panel has high rigidity as a floor slab, flexural deformation due to wheel load when the vehicle travels is small, and the burden on the joint between the main girder and the floor slab panel is also small.

  If the inner concrete is completely sealed by the upper and lower steel plates, the problem of inundation inside can be solved.

It is a section perspective view showing one embodiment of the present invention. It is sectional drawing of the bridge axis orthogonal direction corresponding to embodiment of FIG. It is a cross-sectional perspective view from the lower surface side which shows one Embodiment at the time of using a simple coupling between butt | matching parts. It is a section perspective view showing one embodiment at the time of using a floor slab panel joining member for joining a main girder and a sandwich type composite floor slab panel. (a) is sectional drawing of the bridge axis perpendicular direction corresponding to embodiment of FIG. 4, (b), (c) is sectional drawing of the bridge axis perpendicular direction which shows a modification. It is sectional drawing of the bridge axis orthogonal direction which shows the example of the floor slab panel joining member in the main girder connection part in embodiment of FIG. (a)-(c) is sectional drawing which shows the example of the level | step difference absorption structure in the butt | matching part of sandwich type composite floor slab panels.

  Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional perspective view showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view perpendicular to the bridge axis.

  In this embodiment, the bridge axis is perpendicular to the upper flange of the main girder 1 having an I-shaped cross section extending parallel to the bridge axis direction of the road bridge via a cushioning material or reaction force support material 2 and a floor panel panel joining member 7. Two sandwich-type floor slab panels 3 are placed in the direction, and road pavement 4 is applied thereon.

  A joint is not provided at the abutting portion between the sandwich type composite floor slab panels 3 in the direction perpendicular to the bridge axis, and the abutting state is simply established. If necessary, a thin steel plate or a waterproof sheet may be laid between the upper portion of the butted portion and the road pavement 4.

  In addition to the effect of improving the workability by the sandwich-type composite floor slab panel 3 itself, the no-joint construction in which no joint is provided at the abutting portion between the sandwich-type composite floor slab panels 3 makes it possible to greatly reduce the labor on site construction. In particular, when repair work is required for rapid construction, the effect is great.

In FIG. 1, the butt portion between the sandwich type composite floor slab panels 3 in the bridge axis direction is not shown, but the joint is not provided in the same manner as the butt portion between the sandwich type composite floor slab panels 3 in the direction perpendicular to the bridge axis. can do.

  Alternatively, the butted portions of the sandwich type composite floor slab panels 3 in the bridge axis direction may be joined by a simple joint member that does not substantially transmit the bending action as the floor slab, or a conventional joint structure is used. In the case of further rigid joining, there may be a case of joining with an expansion joint.

  In this embodiment, the sandwich type composite floor slab panel 3 includes a plurality of section steels as rib members 3c arranged in parallel to the direction perpendicular to the bridge axis on the upper steel plate 3a, the lower steel plate 3b, and the lower steel plate 3b. And the steel shell is comprised with the side plate of 4 circumferences, and it has the structure filled with concrete 3d in the steel shell.

  In principle, a precast panel manufactured in a factory including the concrete 3d is used. However, after the steel shell is installed on the main girder 1, the steel shell can be filled on the spot.

  By adopting a structure in which the concrete 3d is sealed by the upper and lower steel plates 3a and 3b, water intrusion into the internal concrete 3d can be cut off, and high durability can be realized. In this regard, there is a great merit especially in applications in coastal areas and cold regions.

  FIG. 3 shows an embodiment in which a simple joint is used between the butted portions. This simple joint considers only the function to suppress slight fluttering (deflection difference) between the panels against the wheel load by, for example, a traveling vehicle, and is not expected to transmit the bending action as a floor slab. Absent.

  In this example, a bolt box 6a is formed at the abutting portion of the sandwich-type composite floor slab panel 1, and a simple joint is constituted by a bolt 6b passed between the bolt boxes 6a. The bolt box 6a has a structure similar to that used for, for example, a shield segment joint, and is provided at a predetermined interval along the side plate 3e of the abutting portion constituting the steel shell.

  In addition, in FIG. 3, the concrete and the upper steel plate with which the steel shell of the sandwich type composite floor slab panel 1 is filled are not shown.

  FIG. 4 is a cross-sectional perspective view showing an embodiment in which a floor slab panel joining member is used for joining a main girder and a sandwich type composite floor slab panel, and FIG. 5 (a) is a bridge corresponding to the embodiment of FIG. It is sectional drawing of an axis perpendicular direction.

  In this example, a member in which a bolt hole is formed in a steel material having an L-shaped cross section (which may be obtained by cutting a shaped steel) is used as a floor slab panel joining member 7 on the lower surface of the lower steel plate 3b of the sandwich type composite floor slab panel 3. It is configured to be attached by welding or the like and bolted to the upper flange of the main girder 1 with bolts 7b.

  In addition, a cushioning material, a reaction force support material 2, a height adjusting material, or the like may be interposed between the upper girder 1 and the upper flange as required, as shown in FIG. 5 (b). Further, as shown in FIG. 5 (c), a sandwich-type composite floor slab panel is formed by using as a floor slab panel joining member 9 a member in which a bolt hole is drilled in a steel material having a reverse T-shaped cross section (which may be obtained by cutting a shaped steel). 3 may be attached to the lower surface of the lower steel plate 3b by welding or the like, and bolted to the upper flange of the main girder 1 with bolts 9b.

  In this case, when the sandwich type composite floor slab panel 3 is fixed to the main girder 1, welding and concrete placement are unnecessary, and labor saving in field work can be achieved. Further, the sandwich-type composite floor slab panel 3 is fixed to the main girder 1 so that the sandwich-type composite floor slab panel 3 has a larger rigidity and less deflection than the general floor slab. Even when the butted portions of the mold composite floor slab panels 3 are made into a no-joint or simple joint, the difference in deflection between the panels is small, so that the influence on the upper pavement and traveling vehicle can be substantially ignored.

  6 shows a cross-sectional view of the main girder connection in the embodiment of FIG. As for the connecting portion of the main girder 1 in the bridge axis direction, splice plates 1a, 1b, 1c and bolts are used to connect the main girders 1 so that the main girder as shown in FIGS. It may not be possible to fix to the upper flange of the girder 1.

  In that case, as shown in FIG. 6, the auxiliary member 8a is fixed to the web of the main beam 1 with the bolt 8c in a form avoiding the splice plates 1a, 1b, 1c and the bolt at the connection portion between the main beams 1. What is necessary is just to make it the structure which joins the cross-section L-shaped floor slab panel joining member 8 and auxiliary member 8a which were attached to the lower surface of the lower steel plate 3b of the sandwich type composite floor slab panel 3 by welding etc. with the volt | bolt 8b.

  FIGS. 7A to 7C show an example of a step absorption structure in a butt portion between sandwich-type composite floor slab panels.

  In (a), a shock absorbing material 11 made of synthetic rubber or foamed resin is installed on the upper surface of the butted portion of the sandwich type composite floor slab panel 3, and a road pavement 4 made of asphalt or the like is constructed thereon. Thus, even if a slight level difference occurs at the abutting portion between the sandwich type composite floor slab panels 3 due to the wheel load of the traveling vehicle or an earthquake, the shock absorbing material 11 absorbs the vibration deformation, and the road pavement 4 is adversely affected. It is designed not to occur.

  The buffer material 11 may be bonded to the upper surface of the butted end portion of the sandwich type composite floor slab panel 3 with a resin adhesive or the like.

(b) is a form in which a stud bolt 13 is melt-planted on the upper surface of the butted end portion of the sandwich type composite floor slab panel 3, and the stud bolt 13 is fitted into a hole formed in the cushioning material 14 similar to (a). The buffer material 14 is fastened.

  (c) shows a case where a commercially available simple embedded joint 15 is attached to the upper surface of the butt portion between the sandwich type composite floor slab panels 3 and the road pavement 4 is constructed thereon.

DESCRIPTION OF SYMBOLS 1 ... Main girder, 1a, 1b, 1c ... Splice plate, 2 ... Buffer material or reaction force support material, 3 ... Sandwich type composite floor slab panel, 3a ... Upper steel plate, 3b ... Lower steel plate, 3c ... Rib material (section steel) 3d ... concrete 3e ... side plate 4 ... road pavement 5 ... railing part
6 ... Simple joint, 6a ... Bolt box, 6b ... Bolt,
7 ... Floor slab panel joining member, 7b ... Bolt, 8 ... Floor slab panel joining member, 8a ... Auxiliary member, 8b ... Bolt, 8c ... Bolt, 9 ... Floor slab panel joining member, 9b ... Bolt,
DESCRIPTION OF SYMBOLS 11 ... Buffer material, 12 adhesion | attachment or welding, 13 ... Stud bolt, 14 ... Buffer material, 15 ... Embedded joint

Claims (5)

A sandwich-type composite floor slab panel in which concrete is filled in a steel shell provided with an upper steel plate and a lower steel plate is a floor slab structure in which a plurality of sandwich-type composite slab panels are installed side by side in the direction perpendicular to the bridge axis and in the bridge axis direction. A floor slab structure using a sandwich-type composite floor slab panel, characterized in that no joint member is provided between the butt portions of the composite floor slab panels in a direction perpendicular to the bridge axis and / or in the bridge axis direction.   A simple joint member is not provided on the upper surface side of the butt portion between the sandwich type composite floor slab panels, a step absorbing cushioning material is installed, and road pavement is provided thereon. A floor slab structure using the sandwich type composite floor slab panel according to claim 1.   The sandwich-type composite floor slab panel according to claim 1 or 2, wherein a floor slab panel joining member for fixing to a main girder of a bridge is provided on the lower surface side of the lower steel plate of the sandwich-type composite floor slab panel. Floor slab structure using   4. The floor slab structure using a sandwich type composite floor slab panel according to claim 3, wherein the floor slab panel joining member is made of steel and is bolted to a main girder of a bridge.   The sandwich-type composite floor slab panel according to any one of claims 1 to 4, wherein the sandwich-type composite floor slab panel is a precast floor slab panel in which concrete is previously filled in a steel shell. The floor slab structure used.

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