JP5346676B2 - Floor slab unit, floor slab joining structure and floor slab construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floor slab unit which has a simple structure capable of reducing weight, and which enables joining work to be performed with ease. <P>SOLUTION: The floor slab units 1 are arranged in a joining direction so as to form the floor slab 10. The floor slab unit 1 includes a floor portion 11 which forms the floor surface 1a of the floor slab, and rib portions 12 and 12 which are suspended from a joining-direction edge of the floor portion. Additionally, a connecting groove 13 directed downward from the floor surface is formed in the rib portion. The connecting groove comprises a narrow portion 13a which communicates with a joining-direction joint surface 12a of the rib portion, and a widened portion 13b which is formed at the floor portion-side end of the narrow portion. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention uses a floor slab unit used when building a floor slab such as a bridge or an artificial ground, a floor slab joining structure constructed by joining the floor slab units, and a floor slab unit. It relates to a method for building floor slabs.

  Conventionally, when building slabs of piers and bridges, precast concrete members are manufactured in advance at the factory, precast concrete members transported to the site are lifted and arranged by a crane, and adjacent precast concrete members are joined together A method for constructing an integral floor slab is known (see Patent Documents 1 to 5).

  The inventions disclosed in these Patent Documents 1 to 4 are all developed by the inventor of the present application, and improvements aimed at reducing weight and improving workability are being continued.

JP 2007-32212 A JP 2003-213623 A JP 2006-348656 A JP 2006-336283 A JP-A-8-246415

  Here, the use of steel is effective if a significant weight reduction is aimed at, but the steel floor slab of the bridge may cause fatigue cracks in the weld due to overloading load or repeated load of the wheel load. In recent years, this has become a problem. On the other hand, although the concrete member is excellent in durability, there has been a problem that it is difficult to reduce the weight.

  In addition, the joint structure formed at the place where the precast concrete members are joined to each other is easily structurally weak, and as disclosed in Patent Document 5, the tension material is tensioned from below the floor slab. In this case, it is necessary to assemble the scaffolding and support work from the bottom, which causes an increase in work period and work cost.

  Accordingly, an object of the present invention is to provide a floor slab unit, a floor slab joining structure, and a method for constructing a floor slab that have a simple structure and can be easily joined.

  In order to achieve the above object, the floor slab unit of the present invention is a floor slab unit arranged in a joining direction to form a floor slab, wherein a connecting groove directed downward from the floor surface of the floor slab is formed. The connecting groove has a narrow portion that communicates with the joint surface of the floor slab in the joining direction, and a widened portion that is formed at an end portion on the inner side of the narrow portion. Features.

  Here, the said floor slab can be set as the structure provided with the floor part and the rib part suspended from the edge part of the said joining direction of the floor part. Moreover, the structure provided with the convex part projected toward the downward direction corresponding to the position in which the said connection groove | channel of the edge part of the said joining direction of the floor part is formed may be sufficient.

  Moreover, it is preferable that a plurality of the connecting grooves are formed at intervals in a direction orthogonal to the joining direction. Furthermore, it is preferable that a concave portion is formed on the joint surface.

  Further, a perforated steel plate protrudes upward on the upper surface of the main girder extending in the joining direction on which the floor slab is placed, and the floor portion has a through hole that accommodates the perforated steel plate. It can be set as the structure formed.

  The floor slab joining structure of the present invention is a floor slab joining structure in which the floor slab units are joined to each other, and a filler is filled between the joint surfaces of the floor slab units to be opposed to each other. A connecting material is bridged between the opposing connecting grooves, and fixing portions formed at both ends of the connecting material are accommodated in the widened portion. Furthermore, it is preferable that prestress is introduced between the floor slab units by the connecting material.

  Further, the floor slab construction method of the present invention is a floor slab construction method that is performed by joining a plurality of the above-mentioned floor slab units, and the joint surface facing one of the installed floor slab units A step of installing the other floor slab unit so that a gap is formed therebetween, a step of filling the gap with a filler, and a step of bridging the connecting material between the connecting grooves. And

  Here, when the connecting member is bridged, the connecting member made of steel having fixing portions formed at both ends is heated, and the connecting member can be inserted into the connecting groove in a thermally expanded state.

  The floor slab unit of the present invention configured as described above has a connecting groove formed downward from the floor surface, and the connecting groove has a narrow portion and a widened portion.

  By using the connection groove opened in the floor surface in this way, joining can be performed by work from the floor surface, so that the workability is excellent. Furthermore, the floor slab joining structure formed using the connecting material on which the fixing portion is formed can easily connect the fixing portion of the connecting material to the step at the boundary between the widened portion and the narrowed portion, thereby easily connecting the floor slab unit. You can connect each other.

  Also, if the part where the joint surface is formed becomes a rib part and hangs down from the side edge of the floor part, the rigidity becomes high and the joint structure does not become a weak part, and the floor part is made thin. Weight reduction can be achieved.

  Further, when the rigidity of the floor slab in the longitudinal direction of the rib portion is increased, the bending moment in the joining direction orthogonal to the direction is redistributed in the longitudinal direction, and the bending moment in the joining direction can be reduced.

  Moreover, if a convex part is provided corresponding to the position where a connection groove | channel is formed, a lightweight floor slab unit can be manufactured economically.

  Moreover, the connection force by the connection material arrange | positioned at a connection groove | channel can be disperse | distributed by forming multiple connection groove | channels in the direction orthogonal to a joining direction at intervals. Furthermore, by providing a concave portion on the joint surface, a mechanical shear key can be formed by the filler filled in the concave portion, and shear displacement deformation in the joint structure can be suppressed.

  When the floor slab is provided on the main girder that is stretched in the joining direction, a perforated steel plate is projected from the upper surface of the main girder, the perforated steel plate is inserted into the through hole of the floor slab, and a filler is placed around it. By filling, the floor slab and the main girder can be firmly integrated.

  Moreover, if a prestress is introduced between floor slab units by a connection material, the intensity | strength of a joining structure will increase and generation | occurrence | production of a crack can be suppressed. Furthermore, if the method for introducing prestress utilizes the temperature shrinkage of the connecting material, the prestress can be easily introduced.

It is a perspective view explaining the structure of the joining structure of the floor slab of embodiment of this invention. It is a perspective view explaining the structure by which the floor slab unit was mounted on the main girder. It is the perspective view seen from the upper surface side in order to demonstrate the structure of a floor slab unit. It is the perspective view seen from the back surface side in order to demonstrate the structure of a floor slab unit. It is a top view explaining the joining structure where a connection material is bridged between floor slab units. It is sectional drawing explaining the joining structure where a connection material is spanned between floor slab units. It is a cross-sectional view explaining the structure of the periphery of the perforated steel plate which joins a floor slab and a main girder. It is a longitudinal cross-sectional view explaining the structure of the periphery of the perforated steel plate which joins a floor slab and a main girder. It is a perspective view explaining the structure of the floor slab unit of Example 1. FIG. It is a perspective view explaining the structure of the floor slab unit of Example 2. FIG. It is a perspective view explaining the structure of the floor slab unit of Example 3. FIG.

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

  FIG. 1 is a partially enlarged perspective view illustrating a joining structure when a floor slab 10 such as a bridge, a pier, an artificial ground or the like is constructed by joining a plurality of floor slab units 1 and 1. As shown in FIG. 2, the floor slab 10 described in the present embodiment spans the floor slab unit 1 between a plurality of main girders 2,... Arranged in parallel. This is a bridge floor slab 10 constructed by sequentially arranging the beams 2 in the axial direction.

  That is, the axial direction of the main girder 2 is the joining direction of the floor slab unit 1 and the bridge axial direction. Further, the longitudinal direction of the floor slab unit 1 which is the direction orthogonal to the main girder 2 is the direction orthogonal to the bridge axis.

  First, the configuration of the floor slab unit 1 will be described with reference to FIGS. The floor slab unit 1 includes a floor portion 11 that forms the floor surface 1 a of the floor slab 10, and rib portions 12 and 12 that are suspended from both edges in the joining direction of the floor portion 11.

  The floor portion 11 is formed in a rectangular plate shape so that the floor surface 1a is flush with the floor surface 1a as shown in FIG. 3, and extends in the joining direction (bridge axis direction) on the back surface as shown in FIG. A plurality of protruding ridges 16 are formed.

  The protruding portion 16 is a portion facing the upper surface 2 a of the main girder 2 and is extended in accordance with a position facing the main girder 2. In addition, although the floor part 11 in which the range of the quadrangle surrounded by the protrusions 16 and 16 and the rib parts 12 and 12 is formed to have a substantially uniform plate thickness will be described as an example here, the present invention is limited to this. The floor portion may be a shape in which the ridge portion extends in the direction perpendicular to the bridge axis or a shape in which the ridge portion is formed in a lattice shape.

  Further, as shown in FIGS. 3 and 4, box-shaped through-holes 14,... Are formed in the protrusion 16 in accordance with the position of the perforated steel plate 21 (see FIG. 2) of the main girder 2. . That is, as shown in FIG. 2, a perforated steel plate 21 for increasing the bonding strength with the floor slab 10 is projected upward on the upper surface 2 a of the main girder 2. When the plate unit 1 is placed on the main beam 2, the perforated steel plate 21 is accommodated.

  On the other hand, the rib portion 12 is suspended in a band shape so as to be substantially orthogonal to the floor portion 11, and a trapezoidal cutout portion 12 b is formed at a position intersecting with the ridge portion 16, that is, a position on the main girder 2. Has been.

  Moreover, the side surface of the outer side of the rib part 12 becomes the joint surface 12a with another floor slab unit 1 to adjoin. As shown in FIGS. 3 and 4, a plurality of concave portions 15,... Are formed on the joint surface 12 a at intervals in the longitudinal direction of the rib portion 12.

  Further, a plurality of connecting grooves 13,... Are formed in the rib portion 12 at intervals in the longitudinal direction of the rib portion 12 in the same manner as the concave portions 15,. As shown in FIG. 1, the connecting groove 13 includes a narrow groove-shaped narrow portion 13a communicating with the joint surface 12a and a widened portion 13b formed at the end of the narrow portion 13a on the floor 11 side. Have.

  The narrow portion 13a is opened toward two surfaces on the floor surface 1a side and the joint surface 12a side, and communicated with the widened portion 13b. The widened portion 13b is a quadrangular columnar cavity having a groove width wider than that of the narrowed portion 13a, and is open toward two surfaces on the floor surface 1a side and the narrowed portion 13a side. For this reason, it becomes possible to insert the connection material 3 toward the bottom of the connection groove | channel 13 from the upper direction of the floor surface 1a.

  The floor portion 11 and the rib portions 12 and 12 of the floor slab unit 1 can be integrally formed with a cement-based mixed material such as concrete. And the floor slab unit 1 of this Embodiment is manufactured using the fiber reinforced cementitious mixed material of super high strength especially.

  This fiber-reinforced cement-based mixed material is obtained by mixing fibers into a cement-based matrix obtained by mixing a composition containing cement, aggregate particles, pozzolanic reactive particles, and a dispersant with water. To manufacture.

  Here, as the aggregate particles, aggregate powder such as cinnabar having a maximum particle size of 3.0 mm or less, preferably 2.5 mm or less is used. Further, as the pozzolanic reaction particles, those having a particle size of 15 μm or less are used. For example, silica fume or the like is used as a highly active pozzolanic reaction particle having a particle size of 0.01 to 0.5 μm, and fly ash or blast furnace slag is used as a low activity pozzolanic reaction particle having a particle size of 0.1 to 15 μm. To do. These pozzolanic reactive particles having different activities can be mixed or used alone. In addition, at least one dispersant such as a high-performance water reducing agent is used to improve fluidity.

For the fiber, for example, a steel fiber having a diameter of about 0.1 to 0.3 mm and a length of about 10 to 30 mm and a tensile yield stress of 2600 to 2800 N / mm ² is used. Further, this steel fiber is mixed in an amount of about 1 to 4% of the total volume of the fiber-reinforced cementitious mixed material to be produced.

A member formed of the fiber-reinforced cement-based mixed material manufactured with such a composition has a compressive strength of 150 to 200 N / mm ² , a bending tensile strength of 25 to 45 N / mm ² , and a split tensile strength of 10 to 25 N. / Mm ² , water permeability is 4.0 × 10 ^-17 cm / sec, salinity diffusion coefficient is 0.0019 cm ² / year, and elastic modulus is 50 to 55 GPa.

  And the floor slab unit 1 is manufactured in a factory etc. using such a fiber reinforced cementitious mixed material. Here, when the floor slab unit 1 is constructed with the fiber reinforced cementitious mixed material, it is usually unnecessary to arrange reinforcing bars.

  Further, prestress can be introduced into the floor slab unit 1. For example, although not shown, a PC steel material such as a PC steel wire is disposed on the rib portion 12 and prestress is introduced in the longitudinal direction of the rib portion 12.

  Here, there are a pre-tension method and a post-tension method for introducing pre-stress, and either method can be applied, but the pre-tension method is more economical to manufacture the floor slab unit 1. Can do.

  When pre-stress is introduced by this pre-tensioning method, a fiber reinforced cementitious mixed material is placed around the PC steel wire in a tensioned and tensioned state. When the tension is released, prestress is introduced into the rib portion 12 and the floor portion 11 through the fiber reinforced cementitious mixed material attached around the PC steel wire.

  Further, the mold packing 4A is attached to the lower edge and both side edges of the joint surface 12a of the rib portion 12 of the floor slab unit 1 formed in this way. The mold packing 4A is formed of closed cell foamed resin or foamed rubber.

  Further, as shown in FIG. 1, a mold packing 4B made of the same material as the mold packing 4A is attached in a substantially U shape in front view so as to surround the opening on the joint surface 12a side of the narrow portion 13a.

  Further, in the present embodiment, the main girder 2 on which the floor slab unit 1 is placed has a bottom slab formed of concrete having a wide I-section as shown in FIG. The main girder 2 can be manufactured from reinforced concrete or prestressed concrete. However, if the main girder 2 is manufactured using the above-described fiber-reinforced cement-based mixed material, the light main girder 2 having a small cross section can be manufactured.

  And the connection material 3 spanned between the floor slab units 1 and 1 arrange | positioned adjacently, as shown in FIG. 1, the axial part 31 spanned between the connection grooves 13 and 13 which oppose, and the both ends The fixing portions 32 and 32 are formed.

  The shaft portion 31 is formed by a steel bolt provided with a bolt head 31a. In addition, the fixing portion 32 is configured by a rectangular plate-shaped pressure bearing plate 32a having one side longer than the groove width of the narrow portion 13a and a nut 32b attached to the tip of the shaft portion 31, and the other end. These end portions are constituted by a bearing plate 32a and a bolt head 31a.

  Further, as shown in FIG. 1, a gap 50 is formed between the joint surfaces 12 a and 12 a of the opposing rib portions 12 and 12. The gap 50 is filled with the filler 5 as shown in FIG.

  This filler 5 is a non-shrink mortar containing a cement-based material and cinnabar sand, a non-shrink mortar mixed with organic fibers such as PVA fiber, polypropylene fiber or high-strength polyethylene fiber, carbon fiber or steel fiber, or The above-described fiber-reinforced cement-based mixed materials can be used.

  As shown in FIGS. 7 and 8, the same material as the filler 5 can be used for the filler 51 filled around the perforated steel sheet 21 accommodated in the through hole 14.

  Next, the construction method of the floor slab 10 of the present embodiment will be described.

  First, the floor slab unit 1 is manufactured in a factory. This floor slab unit 1 is formed of the above-described fiber-reinforced cement mixed material. Further, when the floor slab unit 1 is molded, a mold is placed at a location where the connecting grooves 13,..., The through holes 14,. .

  Further, the mold packing 4A is attached to the lower edge and both side edges of the joint surface 12a of the one rib portion 12. Further, although not shown in FIGS. 3 and 4, the mold packing 4 </ b> B is attached in a U shape along the narrow portion 13 a of the connecting groove 13.

  On the other hand, at the bridge site where the floor slab 10 is constructed, as shown in FIG. 2, a plurality of main girders 2,... Aligned in the longitudinal direction with the bridge axis direction are spaced apart in the direction orthogonal to the bridge axis. Arrange them in parallel. The interval between the main girders 2,... Is matched to the interval between the notches 12b,.

  And the floor slab unit 1 conveyed from the factory is lifted with a crane, and the longitudinal direction is matched with the direction orthogonal to the bridge axis, and it is bridged between the main girders 2. At this time, the notches 12b,... Of the floor slab unit 1 are placed on the tops of the main girders 2,. Further, the perforated steel plates 21,... Protruding from the upper surface 2 a of the main girder 2 are accommodated in the through holes 14,.

  Further, another floor slab unit 1 is installed in the same manner adjacent to the floor slab unit 1 installed in the main girders 2,. The newly installed floor slab unit 1 is installed such that a gap 50 is opened between the floor slab unit 1 previously installed as shown in FIG.

  The width of the gap 50 is set within a range in which adhesion can be ensured so that the filler 5 filled in the upper space is not leaked by being crushed by the joint surface 12a of the rib portion 12 facing the mold packing 4A.

  Further, when forming the gap 50, since the width of the gap 50 is very small, after temporarily placing the floor slab unit 1 with a crane, the connecting member 3 is inserted into the connecting grooves 13, 13 and the nut 32b is tightened. The floor slab unit 1 temporarily placed in (1) can be formed by pulling it to a predetermined position.

  Then, the filler 5 is filled into the space between the mold packing 4A and the mold packing 4B in the gap 50 excluding the locations where the connecting grooves 13 and 13 face each other. Since the filler 5 poured into the gap 50 is also filled in the recesses 15 formed on the joint surfaces 12a, 12a, the filler 5 is cured to be sheared into the recesses 15,. A key is formed. The filler 5 is cured until a predetermined strength is developed.

  Subsequently, the position of the nut 32b is adjusted so that the length of the shaft portion 31 exposed between the fixing portions 32 and 32 of the connecting material 3 becomes a predetermined length. When the connecting member 3 is used when forming the gap 50, the connecting member 3 is once taken out from the connecting groove 13 and the position of the nut 32b is adjusted.

  Subsequently, the connecting member 3 is heated to thermally expand the shaft portion 31. In addition, if it is a steel volt | bolt, even if it heats about 200 to 400 degreeC, the strength reduction by a heat | fever and a brittle fracture will not arise.

  The heated connecting member 3 is inserted into the connecting grooves 13 and 13 from the floor 1a, an air ratchet (not shown) is inserted into the widened portion 13b, and the nut 32b is tightened to remove looseness. Since the inserted connecting material 3 contracts when cooled, prestress is introduced between the rib portions 12 and 12 via the fixing portions 32 and 32.

  Various methods can be adopted as a method of introducing prestress by the connecting material 3. For example, the connecting members 3,... That are heated at intervals are inserted into the connecting grooves 13,. Introduce. Then, the connected connecting members 3,... Are inserted into the remaining connecting grooves 13, and pre-stress is introduced for the second time.

  Then, the connecting member 3,..., Which has been inserted the first time due to the introduction of prestress for the second time, is taken out, the position of the nut 32b is adjusted, heated again and inserted into the connecting groove 13 for prestressing. Introduce. In addition, with respect to the loose coupling material 3, an air ratchet may be inserted into the widened portion 13b and the nut 32b may be tightened.

  Moreover, the filler 5 is filled in the connecting groove 13 in which the connecting material 3 for which the introduction of prestress has been completed is arranged.

  Further, the through hole 14 of the floor slab unit 1 is filled with a filler 51 as shown in FIGS. Here, before the floor slab unit 1 is placed, a mold packing 4C such as foamed rubber is attached to the upper surface 2a of the main girder 2. The floor girder 2 is crushed and adhered by its own weight. Therefore, leakage of the filler 51 can be prevented.

  And the filler 51 with which the through-hole 14 was filled flows also into the hole 21a of the perforated steel plate 21. FIG. Here, in the perforated steel sheet 21, as shown in FIGS. 7 and 8, a hole 21b is also formed in a portion embedded in the main girder 2, and the perforated steel sheet 21 and the main girder 2 are integrated. Yes. For this reason, when the filler 51 of the through-hole 14 hardens | cures, the floor part 11 and the main girder 2 of the floor slab unit 1 will be integrated.

  Next, the operation of the floor slab unit 1 according to the present embodiment, the joining structure of the floor slab 10, and the construction method of the floor slab 10 will be described.

  In the floor slab unit 1 of the present embodiment configured as described above, a portion where the joint surface 12a is formed becomes a rib portion 12 and hangs down from a side edge of the floor portion 11.

  Thus, since the rib part 12 with large cross-sectional rigidity is provided in the location where the joining structure of the floor slab 10 is formed, a joining structure does not become a weak part. Further, in the conventional floor slab formed to have a constant thickness, the entire plate thickness must be increased in order to increase the rigidity of the joint structure. However, in the joint structure of the present embodiment in which the rib portion 12 is provided. In this case, the floor portion 11 can be thinned to reduce the weight.

  In particular, the floor slab unit 1 made of the above-mentioned fiber-reinforced cement-based mixed material can have a weight less than half that of a conventional prestressed concrete slab or a reinforced concrete floor slab.

  Furthermore, if the rigidity in the longitudinal direction of the rib portion 12 that is orthogonal to the bridge axis of the bridge floor slab 10 is increased, the bending moment in the bridge axis generated by the wheel load of the vehicle traveling on the bridge is restored in the direction orthogonal to the bridge axis. The bending moment in the bridge axis direction is reduced. For this reason, even if the joining structure of the floor slab 10 is simplified, the bending moment in the bridge axis direction can be resisted.

  In addition, a connecting groove 13 is formed in the rib portion 12 downward from the floor surface 1a, and the connecting groove 13 has a narrow portion 13a and a widened portion 13b. For this reason, the operation | work which inserts the connection material 3 in this connection groove | channel 13, and the introduction | transduction work of the prestress by the connection material 3 can be easily performed from the floor surface 1a side.

  Further, by preliminarily attaching the mold packings 4A, 4B, and 4C to predetermined positions, the filling work of the filling material 5 into the gap 50 and the filling work of the filling material 51 into the through hole 14 can be performed on the floor surface 1a. It can be done from.

  If the work can be performed from the floor surface 1a in this way, it is not necessary to provide a scaffold or a supporting work under the floor slab 10, and the work can be performed in a highly safe place. A floor slab 10 can be constructed.

  Further, the work of bridging the connecting member 3 having the fixing portions 32, 32 formed at both ends between the connecting grooves 13, 13 is performed by simply inserting the fixing portions 32, 32 along the widening portions 13b, 13b. Since the fixing portion 32 of the connecting member 3 can be engaged with the step at the boundary between the narrow portion 13a and the narrow portion 13a, the floor slab units 1 and 1 can be easily connected to each other.

  In particular, when the prestress is introduced between the rib portions 12 and 12 by the connecting material 3 to further increase the strength of the joint structure, the connecting material 3 that is heated and thermally expanded is inserted into the connecting grooves 13 and 13 to be connected. If it is a method of applying a compressive force by the temperature contraction when the material 3 returns to room temperature, prestress can be easily introduced between the rib portions 12 and 12, and the occurrence of cracks in the joint structure can be prevented. .

  Further, by forming a plurality of connecting grooves 13,... At intervals in the longitudinal direction of the rib portion 12, the compressive force generated by the connecting members 3, ... arranged in the connecting grooves 13,. It can be dispersed between the rib portions 12 and 12 in the longitudinal direction.

  Furthermore, by providing the concave portion 15 on the joint surface 12a of the rib portion 12, a shear key can be formed by the filler 5 filled in the concave portion 15, and the shear displacement deformation in the joint structure is mechanically applied. Can be suppressed by transmission.

  Moreover, when the perforated steel plate 21 protrudes from the upper surface 2a of the main girder 2, the perforated steel plate 21 is inserted into the through hole 14 of the floor portion 11 and filled with a filler 51 around the floor, thereby The plate unit 1 and the main girders 2,... Can be firmly integrated.

  Hereinafter, Example 1 of a form different from the above-described embodiment will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  Unlike the floor slab unit 1 described in the above embodiment, the floor slab unit 1A of Example 1 does not have the rib portion 12. That is, the floor slab unit 1 </ b> A according to the first embodiment is formed in a plate shape from the floor portion 11 to the joining surface 11 a at the edge in the joining direction of the floor portion 11 except for the protruding portion 16 </ b> A.

  This ridge portion 16A is a portion that faces the upper surface 2a of the main girder 2 and extends in a position facing the main girder 2 in the same manner as the ridge portion 16 of the above-described embodiment. And between this protrusion part 16A, 16A, the some connection groove | channels 13, ... are formed at intervals in the bridge-axis orthogonal direction.

  As shown in FIG. 9, the connecting groove 13 includes a narrow groove-shaped narrow portion 13a communicating with the joint surface 11a and a widened portion 13b formed at the end of the narrow portion 13a on the floor 11 side. Have.

  The narrow portion 13a is opened toward two surfaces on the floor surface 1a side and the joint surface 11a side, and is in communication with the widened portion 13b. The widened portion 13b is a quadrangular columnar cavity having a groove width wider than that of the narrowed portion 13a, and is open toward two surfaces on the floor surface 1a side and the narrowed portion 13a side. For this reason, it becomes possible to insert the connection material 3 toward the bottom of the connection groove | channel 13 from the upper direction of the floor surface 1a.

  If it is the floor slab unit 1A of Example 1 comprised in this way, since it can join by the operation | work from the floor surface 1a by using the connection groove | channel 13 opened to the floor surface 1a, construction Excellent in properties.

  Furthermore, the joining structure of the floor slab 10 performed using the connecting member 3 on which the fixing portions 32 and 32 are formed is such that the fixing portion 32 of the connecting member 3 is engaged with the step at the boundary between the widened portion 13b and the narrowed portion 13a. By doing so, it is possible to easily connect the floor slab units 1A and 1A.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  Hereinafter, Example 2 of a form different from the above-described embodiment and Example 1 will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment or Example 1 will be given the same reference numerals.

  The floor slab unit 1B of the second embodiment is not formed with a rib portion as in the floor slab unit 1A of the first embodiment, but a convex portion 17 is formed at a location where the narrow portion 13a of the connecting groove 13 is opened. Is done.

  That is, a plurality of connecting grooves 13,... Are formed between the ridges 16B, 16B of the floor slab unit 1B of the second embodiment at intervals in the bridge axis orthogonal direction. And the convex part 17 whose width | variety is wider than the groove width of the narrow part 13a is formed in the position in which the connection groove | channels 13 ... of the edge part of the joining direction of the floor part 11 are formed.

  If the convex portions 17 are provided only at the edges of the floor portion 11 where the connection grooves 13 are provided, it is economical and the floor portion 11 is made thinner. The plate unit 1B can be reduced in weight.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  Hereinafter, a third embodiment different from the above-described embodiment and first and second embodiments will be described with reference to FIG. The description of the same or equivalent parts as those described in the embodiment or Examples 1 and 2 will be given with the same reference numerals.

  The floor slab unit 1C of Example 3 is not provided with the rib portion 12 over the entire length of the joint surface 12a as in the floor slab unit 1 of the above embodiment, but the connecting groove 13 between the ridges 16C, 16C. ,... Are formed as continuous convex wall portions 18 as convex portions.

  The convex wall portion 18 is an edge portion in the joining direction of the floor portion 11, and is suspended from the vicinity of the center between the ridge portions 16 and 16 placed on the main girders 2 and 2. Since this convex wall part 18 is extended in the direction orthogonal to the bridge axis, the rigidity of the edge part of the floor part 11 between the main beams 2 and 2 where the bending moment in the bridge axis direction becomes large can be improved efficiently. Can do.

  Moreover, if the continuous convex wall part 18 is formed with respect to several connection groove | channels 13 ..., compared with the case where it provides individually, the installation effort etc. of a formwork can be abbreviate | omitted, and workability | operativity Is excellent.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  The embodiments and examples of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments and examples, and the gist of the present invention is not deviated. Design changes are included in the present invention.

  For example, in the above-described embodiments and examples, the bridge floor slab 10 has been described. However, the present invention is not limited to this, and the present invention can also be applied to a pier floor slab and an artificial ground floor slab. .

  Moreover, in the said embodiment and Example, although the cross section I type main girder 2 made from concrete was demonstrated, it is not limited to this, A material may be steel materials and a synthetic member, A cross section is U-shaped or a box. It may be a mold.

  Furthermore, in the said embodiment, although the method of heating the connection material 3 and introduce | transducing prestress by temperature contraction was demonstrated, it is not limited to this, The method of introduce | transducing prestress by tightening the nut 32b It may be.

  Moreover, in the said embodiment, although the connection material 3 formed with a steel volt | bolt was demonstrated, it is not limited to this, The connection material or PC steel wire which fixed the bearing plate to the both ends of PC steel rod It may be a connecting material using.

  Furthermore, although the said embodiment demonstrated the method of forming the clearance gap 50 between the joining surfaces 12a and 12a and filling the filler 5, it is not limited to this, An epoxy is used for the joining surface 12a (11a). The joining structure of the floor slab 10 can be constructed by applying a system adhesive or the like to join the joining surfaces 12a, 12a (11a, 11a) together.

  Moreover, in the said embodiment and Example, although the protruding part 16, 16A, 16B, 16C was provided in the location made to contact | abut to the upper surface 2a of the main girder 2 of floor slab unit 1,1A, 1B, 1C, It is not limited, The location made to contact | abut to the upper surface 2a of the main girder 2 may be formed flat or concave shape.

1, 1A, 1B, 1C Floor slab unit 1a Floor surface 10 Floor slab 11 Floor portion 11a Joint surface 12 Rib portion 12a Joint surface 12b Notch portion 13 Connection groove 13a Narrow portion 13b Widened portion 14 Through hole 15 Concave portion 17 Convex portion 18 Convex portion Wall (convex)
2 Main girder 21 Perforated steel plate 2a Upper surface 3 Connecting material 32 Fixing portion 5 Filler 50 Gap

Claims (9)

A floor slab unit arranged in the joining direction to form a floor slab,
The floor slab includes a floor portion and a rib portion depending from an edge of the floor portion in the joining direction,
A connecting groove for inserting a connecting material into the bottom is formed in the rib part downward from the floor surface, and the connecting groove communicates with the joining surface of the rib part in the joining direction. And a widened portion formed at an end portion on the inner side of the narrowed portion. A floor slab unit arranged in the joining direction to form a floor slab,
The floor slab includes a floor portion and a convex portion protruding downward from an edge portion of the floor portion in the joining direction,
A connecting groove for inserting a connecting material into the bottom is formed in the convex portion downward from the floor surface , and the connecting groove is narrowly connected to the joint surface of the convex portion in the joining direction. And a widened portion formed at an end portion on the inner side of the narrowed portion. The connecting groove, slab unit according to claim 1 or 2, wherein a plurality, is formed at intervals in a direction orthogonal to the joining direction. The floor slab unit according to any one of claims 1 to 3 , wherein a concave portion is formed on the joint surface. On the upper surface of the main girder extending in the joining direction on which the floor slab is placed, a perforated steel plate protrudes upward, and a through hole for accommodating the perforated steel plate is formed on the floor slab. The floor slab unit according to any one of claims 1 to 4 , wherein the floor slab unit is provided. A floor slab joining structure in which floor slab units according to any one of claims 1 to 5 are joined together,
Filling material is filled between the joint surfaces of the floor slab unit to be opposed, a connecting material is bridged between the bottoms of the opposing connecting grooves , and the fixing portions formed at both ends of the connecting material are the widened portion. Floor slab joint structure characterized by being housed in a section. The floor slab joining structure according to claim 6 , wherein prestress is introduced between the floor slab units by the connecting material. A floor slab construction method for joining a plurality of floor slab units according to any one of claims 1 to 5 ,
A step of installing the other floor slab unit so that a gap is formed between the opposing joint surfaces with respect to the one floor slab unit that has been installed;
Filling the gap with a filler;
And a step of bridging the connecting material between the bottoms of the connecting grooves. In bridged the coupling member, heating the steel connecting member fixing portion formed at both ends, according to claim 8, wherein the coupling member is characterized in that inserted into the coupling groove in a state of thermal expansion How to build a floor slab.

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