JP6192302B2 - Joint structure of steel girder and concrete slab - Google Patents

Description

  The present invention relates to a steel girder and a concrete floor for joining a precast concrete floor slab laid on a steel girder to a steel girder in a state in which opening between the opposed floor slabs can be prevented while facing each other on the steel girder. The present invention relates to a joint structure with a plate.

  When joining a steel girder and a precast concrete floor slab laid on it, the floor slab is integrated with the steel girder and has a composite structure that is supposed to behave together with the steel girder. On the other hand, it is necessary to be joined so that there is no deviation.

  When the floor slab is constructed with cast-in-place concrete, a deck plate, etc. is laid on the steel girder, and concrete is placed on the stud bolt protruding from the deck plate by placing this as a formwork. It can be integrated, but if a precast concrete floor slab is used, a deck plate that also serves as a formwork is not required, so the floor slab must be placed and supported directly on a steel girder. become.

  If the precast concrete floor slab is supported by the steel girder at the peripheral part (edge) of the floor slab, the opposite slab on the steel girder will be in a simple support state, and the width direction or the middle in the axial direction Since the bending of the portion cannot be ignored, the floor slab is supported by the steel girder at the position of the intermediate portion in the width direction, and integration with the steel girder is achieved at the support portion to the steel girder (see Patent Documents 1 to 3). .

  In this case, since a shear force transmission member such as a stud bolt for securing the integrity with the floor slab is projected on the upper surface of the steel girder, the portion located on the steel girder of the floor slab is the shear force transmission member An opening for insertion of is formed. By filling the opening with a filler such as mortar, concrete, or adhesive, the shear force is transmitted between the floor slab and the steel beam due to the adhesive force with the shear force transmitting member.

  In the method of forming an opening for inserting a shearing force transmission member into a portion of the floor slab located on the steel beam as in Patent Documents 1 to 3, the strength around the opening is likely to decrease due to the formation of the opening, While stress tends to concentrate around the opening and the bar arrangement in the floor slab is restricted, if the opening area is reduced, the integration effect by the shear force transmission member will be reduced, making it difficult to cope with construction errors, etc. There are inconveniences. On the other hand, for example, if the steel material on which the shear force transmission member is protruded is integrated with the floor slab in advance, and the shear force transmission member is embedded in the floor slab, problems associated with the formation of the opening It is considered possible to eliminate this (see Patent Document 4).

Japanese Utility Model Publication No. 5-3527 (Claim 1, second column, line 13 to fourth column, line 41, FIGS. 1 to 3) Japanese Patent Publication No. 7-113203 (Claim 1, paragraphs 0007, 0009, FIG. 1, FIG. 2, FIG. 4) JP-A-10-311007 (Claim 3, paragraphs 0018 to 0021, FIGS. 1 to 4, 10, and 11) Japanese Patent Laid-Open No. 7-216826 (Claim 1, paragraphs 0011 to 0013, FIG. 1)

  However, in the method in which the steel material on which the shearing force transmission member is protruded is joined in advance to the floor slab, and the shearing force transmission member is embedded in the floor slab, the work of joining the steel material to the steel girder at the site is required. For this reason, on-site workability and construction efficiency are reduced. In addition, as a result of the steel material being integrated on the back side when the floor slab is manufactured, it is difficult to stack the floor slabs in multiple stages, and the efficiency of carrying in to the site is also reduced.

  In the present invention, in order to solve the above-mentioned problem, the ends of the precast concrete slabs laid on the steel girders are opposed to each other on the steel girders, but the opening between the opposed slabs can be prevented. When joining the steel girder and supporting the middle part of the floor slab on the steel girder, overcome the difficulties that arise when forming an opening in a part of the floor slab or pre-integrating the shear force transmission member with the floor slab The present invention proposes a joint structure between a steel girder and a concrete slab that can enhance the effect of integrating the slab and steel girder.

The joint structure of the steel girder and the concrete slab of the invention according to claim 1 is a joint structure of a steel girder and a precast concrete floor slab laid on and adjacent to the steel girder. Yes,
A connecting plate protrudes in parallel with the web or the lateral rib on a flange that is integrated on the web or the lateral rib that is a part of the steel beam and projects on both sides of the web or the lateral rib in the width direction. , on the flange, the floor plate having a convex portion that is continuous with the periphery of the rear side in the circumferential direction, is placed on opposite sides of the connection plate, between the respective convex portions of both deck to the counter to the connecting plate inserted bolt through the, it is bonded to the steel girder both deck to the counter via the connecting plate,
The bolt is configured to join both the floor slabs to each other, join the both floor slabs to the connecting plate, and bind the both floor slabs to the steel girders .
The invention according to claim 2 is characterized in that, in the invention according to claim 1, the bolt is directed in a direction in which the two floor slabs face each other.

  “A web that is part of a steel girder” refers to any one of the webs that make up the steel girder and have shear resistance elements. The web of the main girder facing the bridge axis and the web of the cross girder facing the direction perpendicular to the bridge axis. Including both. Further, since the “lateral rib” is functionally equivalent to the web of the cross beam, “the web that is a part of the steel beam” and “the horizontal rib” are described in parallel. Hereinafter, in this item, “web or horizontal rib” is referred to as “steel girder web etc.” or “web etc.”. Since the web that is part of the steel girder includes the main girder web and the cross girder web, the direction of joining between the floor slabs that are joined together on the web or the like, that is, the axial direction of the bolt is the bridge axis direction. It does not matter whether it is in the direction perpendicular to the bridge axis.

  The flange is integrated with the upper end of a steel girder web or the like as a resistance element against a bending moment by welding or the like, and projects to both sides of the web or the like in the width direction. The connecting plate on the flange is protruded by welding or the like parallel to the web or the like and perpendicular to the flange. In the case of a single connecting plate, as shown in FIG. 1- (a), it protrudes on the center line in the width direction of the flange and on the extension line of the center line of the web or the like. Since it is not restricted to a sheet | seat, it may not be located on the center line of the width direction of a flange. In order to give the connecting plate the tensile strength and toughness required to maintain the restrained state of the bolts that penetrate it, and from the viewpoint of workability of joining (fixing) to the web etc., the plate ( Steel plate) is used, but a plate made of fiber reinforced plastic such as FRP can also be used, and in that case, it is fixed to the flange by bonding or the like. When the connection plate is a plate, the connection plate is joined to the flange by welding.

  The floor slab has a shape in which convex portions that are continuous in the circumferential direction are formed along at least the periphery (edge or edge) on the back side. The convex part of the floor slab is formed for the purpose of joining the floor slabs facing each other on the steel girder using the connection plate or via the connection plate, but the floor slab is supported opposite to the steel girder. For example, the convexity is formed on the back side of both ends in the length direction (bridge axis direction) of the floor slab, so that the bending rigidity of the floor slab is improved. The plate thickness is suppressed. By suppressing the plate thickness of the floor slab body part, the distance between the back of the floor slab body part and the back of the convex part can be earned, and the height for inserting the bolt in the width direction of the convex part is secured. It becomes possible.

  If the floor slab has convex portions along the periphery, the convex portions of the adjacent floor slabs can be joined to each other. Therefore, the area on the back surface surrounded by the convex portions may be a flat surface. However, in order to further improve the bending rigidity of the entire floor slab, it is unidirectional in the area on the back side surrounded by the convex portions, or in two directions as shown in FIGS. 1- (b) and 4- (a). In some cases, a continuous rib protruding from the back of the floor slab is formed. The shape in which the rib is formed in one direction in the region on the back side surrounded by the convex portion has a joist slab shape, and the shape in which the rib is formed in two directions becomes a waffle slab shape. When the rib is formed in one direction, the rib becomes a resistance element against a bending moment acting on the floor slab around an axis orthogonal to the axial direction, and therefore the direction of the rib is determined according to the fulcrum of the floor slab. When the floor slab as a unit is supported on both sides of the bridge axis direction, the rib faces the bridge axis direction, and when it is supported on both sides of the bridge axis perpendicular direction, the rib faces the bridge axis perpendicular direction.

  The floor slabs adjacent to each other on the steel girder face each other on a flange projecting from a web or the like, and are placed on the flanges with a connecting plate sandwiched between the opposing floor slabs. The floor slabs that are opposed to each other with the connection plate interposed therebetween are joined to each other by a bolt that faces the direction in which both floor slabs face each other passing through the convex portion of each floor slab and the connection plate. Bolts that penetrate (penetrate) the convex portions of the floor slab in the width direction pass through the connection plate fixed to the web, etc., so that both floor slabs are bound to each other while being joined to each other, Rising from the steel girder and relative movement with respect to the steel girder along the axial direction of the steel girder (web, etc.) are prevented. In addition, as shown in FIG.7- (b), in the part (concave part) enclosed by the convex part and horizontal rib of each floor slab, the number of the volt | bolts which penetrate the convex part and connection plate of each floor slab is one. However, it may be multiple.

The floor slabs facing each other across the connection plate are joined together by bolts penetrating both floor slabs and the connection plate, and at the same time indirectly joined to the steel girders, so the connection plate and floor slab (convex part) It does not matter whether there is a clearance (gap) between the side surfaces. However, if clearance is ensured at least between the connecting plate and the side of the floor slab, the clearance can be filled with a filler such as mortar, concrete, adhesive, etc. (Claim 9 ). Since the adhesive force acts between the filler and the side surface of the floor slab and between both sides of the connecting plate by filling the material, there is an advantage that the effect of joining the floor slab and the connecting plate by the bolt is supplemented.

  When filling the filler between the connecting plate and the floor slab, the connecting plate and the bolt are embedded in the filler, so that they can be protected from being exposed to the outside air, and the adjacent floor The upper surface (top end surface) of the plate can be continued through the joints on the steel girders to finish it flat.

  Furthermore, the connection plate is formed with an insertion hole for the bolt to be inserted. When the filler is filled in the insertion hole, the floor slab and the connection plate are about to move (displace). In addition, since the filler works to prevent relative movement, the integrity of the floor slab and the connecting plate is ensured. Filler is filled in both sides of the connection plate and in the insertion hole, so that the adhesive force between both sides of the connection plate and the outer peripheral surface of the filler filled in the insertion hole and in the insertion hole In addition to the bearing pressure generated between the cylinder and the peripheral surface, the shear resistance in the same plane as both sides of the connecting plate on both ends of the columnar filler is generated as resistance to the shear force when attempting to cause relative movement. become.

  The convex part of the floor slab can form at least the convex part from the bottom to the back of the floor slab main body excluding the convex part of the floor slab. Have a height. The convex portion may have a height at which a plurality of bolts can be arranged in the height direction or a height at which the bolts can be arranged in a staggered manner in the height direction. “Back surface of floor slab main body” is the back surface of the area excluding the convex portion when the floor slab has a shape having only the convex portion on the periphery, and at least one direction on the inner peripheral side of the peripheral convex portion as described above In the case of a shape having ribs, it refers to the back surface of the region excluding the convex portions and the ribs.

  Regardless of whether or not there is a clearance between both sides of the connection plate and the side of the floor slab (convex), the floor slab facing on the steel girder is joined to the connection plate by bolts. It will be in the state fixed also to the web etc. to which the board is fixed. Since the convex part of the floor slab is continuous along the periphery of the floor slab, the bolts are arranged at intervals in the direction in which the convex part continues. For example, when ribs are formed in two directions on the back surface of the floor slab main body, the bolt 9 is, for example, a region defined by the convex portion 2 and the rib 3 facing it as shown in FIGS. The convex part 2 is penetrated from the concave part) or from the side of the convex part 2.

  The opposing floor slabs are joined to each other with a plurality of bolts arranged along the length direction of the convex parts, so that the opposing floor slabs are steel girder against the bending moment caused by the loading load received by the floor slabs. Rotation (opening) of the slab end due to the bending moment is prevented because the rotation around the axial direction of the slab is restrained and is rigidly joined to the web or the like. Both ends in the width direction of the floor slab or both ends in the axial direction are rigidly joined to the web etc. As a result, the floor slab is supported in a fixed state between the webs of adjacent steel girders. The amount of flexure in the width direction of the floor slab or in the intermediate portion in the axial direction is reduced as compared with the case where is simply supported. The axial direction of the slab refers to the bridge axis direction when the slab is laid, and the width direction refers to the direction perpendicular to the bridge axis.

  In claim 1, the floor slab is supported in a state where both ends are fixed between adjacent steel girders, etc., so that the end of the floor slab is supported by the steel girder while the end of the floor slab is rotated. Constrained and the opening between the opposing floor slabs is prevented, and at the same time, the deflection in the intermediate portion in the width direction or the axial direction is reduced. As a result, there is no need to arrange the floor slab so that the intermediate part in the width direction or the axial direction of the floor slab is located on the steel girder, and it is also necessary to form an opening for joining the steel girder in the intermediate part. In addition, it is not necessary to previously integrate a steel material for joining the steel girder in the intermediate portion.

  In addition, since the bolts that join the opposing convex portions to each other are arranged at intervals in the length direction of the convex portions, the convex portions can be continuously joined in the length direction, so the middle of the floor slab The effect of integrating the floor slab and the steel girder is enhanced compared to the case where the steel girder is joined via the shearing force transmission member in the opening partially formed in the part. In addition, since it is not necessary to adjust the position of the floor slab at the site as in the case of forming an opening in the middle part of the floor slab, the workability and construction efficiency at the site are improved.

The joint structure between the steel girder and the concrete slab of the invention according to claim 3 is a joint structure between a steel girder and a precast concrete floor slab laid on and adjacent to the steel girder. Yes,
A connecting plate parallel to the web or the transverse rib at the both sides in the width direction of the flange which is integrated on the web or the transverse rib which is a part of the steel girder and which protrudes on both sides of the web or the transverse rib in the width direction However, the floor slabs are joined in a state in which a part in the width direction protrudes upward from the upper surface of the flange, and the floor slabs having convex portions continuous in the circumferential direction around the back surface are opposed to each other on the flange. The connecting plate is inserted into the convex portion, a bolt is inserted between the convex portions of the opposing floor slabs through the connecting plate, and the opposing floor slab is connected to the convex portion. It is assumed that the steel girder is joined via a plate.

In the third aspect , the connecting plate 8 is arranged at least on both sides in the width direction of the flange 7 in parallel with the web 5 and the like as shown in FIGS. Joined and fixed by welding or the like. The bolt 9 is inserted through a portion of the connecting plate 8 protruding upward from the upper surface of the flange 7 together with the convex portion 2 of the floor slab 1.

  In this case, when the bolt 9 is inserted through a portion of the connecting plate 8 that protrudes upward from the upper surface of the flange 7, the bolt 9 is inserted into the convex portion 2 of the floor slab 1 and each convex portion 2. Since the connecting plate 8 is fixed to the flange 7 by welding or the like so as to penetrate the plate 8 in the width direction of the convex portion 2, the opposing floor slabs 1 and 1 on the flange 7 are joined together, It is in a state of being indirectly fixed to the web 5 or the like.

  In the example shown in FIG. 2, the lower portion of the connection plate 8 protrudes from the lower surface side of the flange 7, but it is not always necessary to protrude, and the lower side surface of the connection plate 8 is aligned with the lower surface of the flange 7 or connected. The lower side surface of the plate 8 may be welded or the like in a state where it is placed on the upper surface of the end portion of the flange 7. When the lower part of the connecting plate 8 projects to the lower surface side of the flange 7, they are joined to each other with bolts 9 that penetrate the web 5 etc. on the lower surface side of the flange 7 as in the example shown in FIG. There is also.

As shown in FIGS. 2 (a) and 2 (b), in claim 3 , the convex portions 2, 2 of the floor slabs 1 and 1 facing each other on the flange 7 are the same as in claim 1 as in the example shown in FIG. Since the bolts 9 penetrating the opposing convex portions 2 and 2 are joined, the convex portions 2 are directly constrained from rotating with respect to the bending moment caused by the loading load received by each floor slab 1. The floor slab 1 is rigidly joined to the web 5 or the like. As a result, as in the example of FIG. 1, the floor slab 1 is supported in a state where both ends are fixed between adjacent steel girders 4, 4 (webs 5, 5, etc.), and the opening between the floor slabs due to a bending moment is provided. At the same time, the amount of bending of the intermediate portion in the width direction or the axial direction is reduced.

In particular FIG. 2-(b) the connection plate 8 in the widthwise direction central portion or the like on the flange 7, as shown is projected (fixed) by welding or the like, the connection plate 8 on the flange 7 in claim 3, the flanges 7, when the bolt 9 inserted through the convex portions 2, 2 of the floor slab 1, 1 facing each other passes through (Claim 4 ), it faces on the flange 7 as in the example shown in FIG. 1. The raised portions 2 and 2 of the floor slabs 1 and 1 are fixed to the connection plate 8 on the flange 7 via bolts 9. Also in this case, the number of connecting plates protruding on the flange 7 between the convex portions 2 and 2 is not limited to one.

In this case (Claim 4 ), a bolt 9 penetrating between the convex portions 2 and 2 of the opposing floor slabs 1 and 1 projects on the flange 7 and the connection plate 8 inserted into each convex portion 2. By passing through the connecting plate 8 formed, a restraining effect on the bolt 9 when the floor slab 1 is subjected to a bending moment due to the loading load is expected. There is an advantage to improve. Further, when the floor slab 1 receives a force to move relative to the web 5 or the like in the axial direction of the web 5 or the like, the connection plate 8 on the flange 7 exerts a shear resistance, so There is an advantage that the stability against the displacement of the floor slab 1 is also improved.

The joint structure of the steel girder and the concrete slab of the invention according to claim 5 is a joint structure of a steel girder and a precast concrete floor slab laid on and adjacent to the steel girder. Yes,
A connecting plate parallel to the web or the transverse rib at the both sides in the width direction of the flange which is integrated on the web or the transverse rib which is a part of the steel girder and which protrudes on both sides of the web or the transverse rib in the width direction However, a part of the width direction protrudes upward from the upper surface of the flange and protrudes downward from the lower surface of the flange. On the flange, a convex continuously extending around the back side. The floor slab having a portion is placed opposite to each other, and the connecting plate is inserted into the convex portion, and the web or the lateral rib is interposed between portions of the connecting plate that protrude downward from the lower surface of the flange. And the bolts are inserted therethrough, and the opposing floor slabs are joined to the steel girders via the connecting plates.

In the fifth aspect , as shown in FIG. 3A, the connection plates 8 and 8 disposed on both sides in the width direction of the flange 7 project upward and downward of the flange 7, and at least the flange 7 of the connection plates 8 and 8. Since the bolt 9 together with the web 5 penetrates in the width direction of the flange 7 through the portion protruding downward from the lower surface of the plate, the connection plates 8 and 8 are fixed to the web 5 or the like. Is not necessarily fixed to the flange 7 by welding or the like at both sides in the width direction of the flange 7. However, when the connection plates 8, 8 located on both sides of the flange 7 in the width direction are fixed to the web 5 etc. only by the bolts 9 penetrating the web 5 etc., the connection in a state where the floor slabs 1, 1 are supported. In order to ensure the stability of the plates 8 and 8, the connecting plates 8 and 8 may be fixed to the end of the flange 7 by welding or the like.

In FIG. 3A, when the connection plates 8 on both sides in the width direction of the flange 7 are not welded to the flange 7, the connection plate 8 falls due to the presence of a clearance between the connection plate 8 and the web 5 ( In order to prevent (inclination), a spacing member 11 is interposed between the connecting plates 8 and 8 facing the flange 7 and the web 5 or the like, and the spacing between each connecting plate 8 and the web 5 or the like. Is maintained (claim 9 ). As shown in the figure, the spacing member 11 is a plate (plate) -like member that overlaps in the thickness direction, or a cylinder (sleeve) -like member that holds the spacing between the connecting plates 8, 8 facing each other and the web 5. Etc. are used. The spacing member 11 may be of any form as long as it can serve to retain the spacing between the connecting plates 8, 8 facing each other and the web 5.

In claim 5 , since the connection plate 8, 8 is fixed to the web 5, etc., as a result of the bolt 9 being inserted together with the web 5, etc., between the portions located below the lower surface of the flange 7. The floor slabs 1 and 1 facing each other on the flange 7 are joined to each other by inserting a connection plate 8 into each convex portion 2. At the same time, since the connection plates 8 and 8 are fixed to the web 5 or the like, the floor slabs 1 and 1 are indirectly fixed to the web 5 or the like.

In claim 5 , the floor plate 1 is placed on the flange 7 of the steel girder 4, and the connecting plate 8 inserted into the convex portion 2 is joined to the web 5 or the like by the bolt 9, so that the floor plate 1 is overlaid. Since the load is distributed and applied to the flange 7 of the steel girder 4 and the web 5 or the like, the connection plates 8 on both sides in the width direction of the flange 7 in FIG. 3 are absent, and both the flanges 7 are opposed to each other. The burden on the flange 7 is reduced compared to the case where the entire load of the floor slabs 1 and 1 is borne.

Moreover, since the connection plates 8 and 8 integrated with the convex part 2 of the floor slab 1 are located on both sides in the width direction of the flange 7, if the width of the flange 7 is large, the width (area) of the convex part 2 placed on the flange 7. ) Increases, the load ratio of the flange 7 increases. On the other hand, since it becomes easy to ensure a space | interval between the convex parts 2 and 2 of the floor slabs 1 and 1 which oppose on the flange 7, between the convex parts 2 and 2 which oppose on the flange 7, as described in Claim 6. When the bolt 9 is inserted, as in the example of FIG. 2- (b), the connecting plate 8 between the convex portions 2, 2 on the flange 7 as shown by a two-dot chain line in FIG. 3- (a). Can be arranged and fixed to the flange 7 (claim 7 ). In that case, the same effect as that of claim 4 is expected.

The connecting plate 8 on the flange 7 added between the convex portions 2 and 2 facing each other on the flange 7 is formed on the flange 7 in the length direction (axial direction) of the flange 7 (web 5 or the like). The projecting portions 2 and 2 of the floor slabs 1 and 1 placed on the flange 7 face each other with the connection plate on the flange 7 interposed therebetween (Claim 7 ).

As shown by a two-dot chain line on the flange 7 in FIG. 3- (a), the connecting plates on both sides in the width direction of the flange 7 between the opposing convex portions 2, 2 on the flange 7 as in FIG. 2- (b). When a connecting plate 8 different from 8 is fixed (Claim 7 ), a bolt 9 indicated by a two-dot chain line passes through the connecting plate 8 between the projections 2 and 2 (Claim 6 ). Similar to the item 4 , the restraint effect on the bolt 9 when the floor slab 1 is subjected to a bending moment due to the overload improves the deformation resistance of the floor slab 1 and the proof strength against the bending moment. In addition, when the floor slab 1 receives a force to move relative to the web 5 or the like in the axial direction of the web 5 or the like, the connecting plate 8 on the flange 7 exerts a shear resistance force. The stability with respect to the displacement of the floor slab 1 with respect to, etc. is also improved. Also in this case, the number of connecting plates protruding on the flange 7 between the convex portions 2 and 2 is not limited to one.

In the example of FIG. 3 (Claim 5 ), the connecting plates 8 and 8 are fixed to the web 5 or the like by bolts 9 penetrating at least the portion protruding downward from the lower surface of the flange 7. When the connecting plate 8 is not welded to the flange 7, the rotation center of the convex portion 2 due to the bending moment acting on each floor slab 1 is positioned on the axis of the bolt 9. In contrast to the example, the restraining effect of the convex portion 2 may be reduced.

Therefore, as shown by a two-dot chain line in FIG. 3A, the projecting portions 2 and 2 that face each other in the same manner as in the example of FIG. 2 and the bolts 9 that penetrate the connection plates 8 and 8 inserted in the respective interiors. In some cases, the joint between the convex portions 2 and 2 may be supplemented (claim 6 ). However, as long as the connection state between the connecting plates 8 and 8 by the bolts 9 penetrating the web 5 or the like is maintained, the rotation of the end portion of the floor slab 1 is restrained and the opening between the opposing floor slabs 1 and 1 is prevented. At the same time, the deflection in the width direction or axial direction intermediate portion is reduced.

In addition to the bolt 9 penetrating the web 5 or the transverse ribs, in the claims 5, claim 6, the convex portions 2 of the slab 1, 1 placed to face on the flange 7 bolts 9 are inserted The bolt 9 penetrates the connecting plates 8 and 8 inserted into the inside thereof together with the convex portions 2 and 2.

When the connecting plate 8 is projected on the flange 7 as shown in FIGS. 2- (b) and 3- (a) (Claims 4 and 7 ), the floor slabs 1 and 1 facing each other on the flange 7 are provided. When a clearance is secured between the convex portions 2 and 2 and this clearance is filled with the filler 10 (Claim 9 ), the filler 10 is filled in the insertion hole of the connection plate 8 on the flange 7. As a result, when the floor slab 1 and the connection plate 8 try to cause relative movement (displacement), the filler 10 works so as to prevent relative movement, so that the floor slab 1 and the connection plate 8 are integrated. The advantage that the property is improved is obtained.

  Further, when the connecting plate 8 is not projected on the flange 7 and the bolt 9 is merely inserted between the convex portions 2 and 2, the filler 10 protects the bolt 9 from the outside air, It works to increase the adhesion between them. When the connecting plate 8 is not projected on the flange 7 and the bolt 9 is not inserted between the convex portions 2 and 2, the filler 10 has a clearance between the convex portions 2 and 2 of the adjacent floor slabs 1 and 1. It fills and plays the role of flattening the surface between the floor slabs 1 and 1.

  In the example shown in FIG. 3, when the connection plates 8 positioned on both sides in the width direction of the flange 7 are welded to the flange 7, the rotation center of the convex portion 2 due to the bending moment acting on the floor slab 1 is connected to the flange 7. Since it becomes a junction part of the board 8, the stability with respect to rotation of the convex part 2 is higher than the case where the connection board 8 is not welded.

  On the other hand, if the width of the flange 7 is small in the example of FIG. 3A, the distance between the connection plates 8 and 8 sandwiching the flange 7 is shortened, and the distance between the connection plate 8 and the web 5 is reduced. The length of the bolt 9 that joins the connecting plate 8 to the web 5 or the like is shortened, and the bending moment that the bolt 9 receives is reduced. The convex portions 2 and 2 that face each other on the flange 7 may be placed on the flange 7 in contact with each other. In this case, the bolt 9 may be inserted between the convex portions 2 and 2 that face each other.

As described above, in claims 3 to 8 (FIGS. 2 and 3), as long as the connection state between the connecting plates 8 and 8 by the bolts 9 is maintained, the width direction or the axial direction of the floor slab 1 is maintained. There is no need to arrange the floor slab 1 so that the middle part is positioned on the steel girder 4, and it is also necessary to form an opening for joining the steel girder 4 in the middle part. Therefore, there is no need to previously integrate steel materials for the purpose.

  Further, the bolts 9 that join the opposing convex portions 2 and 2 to each other are arranged at intervals in the length direction of the convex portion 2 so that the convex portions 2 and 2 are continuously joined in the length direction. Therefore, the integration effect of the floor slab 1 and the steel girder 4 is enhanced as compared with the case where the steel girder is joined via the shearing force transmission member in the opening partially formed in the intermediate portion of the floor slab 1. In addition, since there is no need to adjust the position of the floor slab at the site as in the case where an opening is formed in the middle part of the floor slab 1, the workability and construction efficiency at the site are improved.

  2- (a) and (b), when the connection plates 8 positioned on both sides of the flange 7 in the width direction are fixed to the flange 7 by welding or the like, or as shown in FIG. 3, the width direction of the flange 7 When the connection plates 8 located on both sides are directly fixed to the web 5 or the like by bolts 9 penetrating the connection plate 8 and the web 5 or the like, or the connection plates 8 located on both sides in the width direction of the flange 7 are fixed to the flange 7 In this case, the floor slab 1 is simply supported by the web 5 or the like when the connecting plate 8 is simply inserted into the convex portion 2 and supported by the connecting plate 8.

  2 and 3, the upper side of the connection plate 8 located on both sides in the width direction of the flange 7 protrudes upward from the upper surface of the flange 7, and the connection plate 8 protruding from the flange 7 is the floor plate 1. The connecting plate 8 and the convex portion 2 of the floor slab 1 are integrated into the convex portion 2. The floor slab 1 may be integrated with the connection plate 8 by being manufactured with the connection plate 8 inserted in advance into the convex portion 2 or by being dropped on the connection plate 8 at the site. In the latter case, the connecting plate 8 is integrated into the floor slab 1 by being inserted into a groove formed on the convex portion 2 from the lower surface side. At this time, the groove of the convex portion 2 may be filled with a filler such as mortar, concrete, or adhesive that fills the clearance with the connection plate 8.

  From the viewpoint of transport efficiency of the floor slab, the latter method of integrating the connection plate with the floor slab on site is suitable because it is not necessary to project the connection plate from the floor slab. From the viewpoint of securing the safety and the workability at the site, the former method in which the connecting plate is embedded in the convex portion in advance is suitable.

  In the former method, the connecting plate is integrated with the convex portion in advance, but the protruding position of the connecting plate is limited to the periphery of the floor slab. Since it is possible to load a single floor slab, the transport efficiency is not particularly reduced. This point is different from the floor slab of Patent Document 4 in which it is difficult to overlap the steel material by shifting in the width direction because the steel material protrudes in the middle part in the width direction of the floor slab. On the other hand, since the connection plate can be embedded in the position of the convex portion in advance when the floor slab is manufactured (concrete placement), the manufacturing accuracy (connection plate placement accuracy) is ensured and on-site positioning work is performed. There is also an advantage that does not require.

  In claim 1, a connecting plate is projected on a flange that is a part of a steel girder, or a flange integrated on a lateral rib, and a floor slab having a convex portion is opposed to the flange with the connecting plate interposed therebetween. The end of the floor slab is joined to the connecting plate while the opposing floor slabs are joined to each other by inserting bolts that penetrate the connecting plate between the convex portions of the opposing floor slab. Can be obtained by rigidly joining the floor slab to the web or horizontal rib while supporting the steel girder, preventing the floor slab from opening due to the bending moment, Bending can be prevented.

In claim 3 , a connecting plate is arranged to project upward from the flange on both sides in the width direction of the flange integrated with the web, which is a part of the steel girder, or the lateral rib, and has a convex portion on the flange. To place the floor slabs facing each other and insert the connecting plate into the convex part and insert the bolt between the connecting plates to join the opposing floor slabs to the web or horizontal rib While the end of the slab is supported by the steel girder, it is possible to obtain a state in which the floor slab is rigidly joined to the web or the lateral rib, preventing the opening between the slabs due to bending moment, Bending can be prevented.

In both of claims 1 and 3 , it is necessary to form an opening for joining the steel girder in the middle part as in the case where the floor slab is supported by the steel girder at the position of the middle part in the width direction or the axial direction of the floor slab. Therefore, it is not necessary to previously integrate a steel material for joining the steel beam to the intermediate portion.

Further, in both of claims 1 and 3 , the bolts that join the opposing convex portions to each other are arranged at intervals in the length direction of the convex portions, so that the convex portions can be continuously joined in the length direction. Therefore, the integration effect of the floor slab and the steel girder is higher than that in the case where the steel girder is joined via the shearing force transmission member in the opening partially formed in the intermediate portion of the floor slab. In addition, since there is no need to adjust the position of the floor slab at the site as in the case of forming an opening in the middle part of the floor slab, the workability at the site is improved.

(A) shows an example in which a connecting plate is fixed to a flange integrated with a steel girder web and the like, and the floor slabs facing on the flange are joined with bolts penetrating the convex portions of each floor slab and the connecting plate. (B) xx sectional view, (b) is a yy sectional view of (a) showing the state of the back side of the opposite floor slab shown in (a) and (c), (c) ) Is a cross-sectional view taken along line xx of (b) showing a state of a joint portion when the bolt in (a) is formed into a curved shape. 1 (a) joins the connecting plate shown in FIG. 1 to both sides of the flange in the width direction, and connects the opposing floor slab to the convex portion of each floor slab with each connecting plate inserted into the convex portion of each floor slab. The longitudinal cross-sectional view which showed the example at the time of joining with the volt | bolt which penetrates a board, (b) joins the connection board shown in FIG. 1 also on the flange in (a), and the floor slab facing this connection board is also shown. It is the longitudinal cross-sectional view which showed the example at the time of inserting the volt | bolt which penetrates. (A) is a bolt which penetrates the connecting plate and the web facing each other in the state where the connecting plates are arranged on both sides in the width direction of the flange and each connecting plate is inserted into the convex portion of each floor slab. XX sectional view of (b) showing an example in the case of being indirectly joined, (b) showing the state of the back side of the opposed floor slab shown in (a) yy of (a) It is line sectional drawing. (A) is a rear view of a floor slab showing a state where a floor slab adjacent to the bridge axis direction is joined with a bolt facing the bridge axis direction on a web or the like facing the bridge axis perpendicular direction of the steel girder, and (b) is ( FIG. 6A is a sectional view taken along line xx of FIG. 5A, and FIG. 5C is a sectional view taken along line yy of FIG. It is the perspective view which showed a mode that the floor slab was laid on the steel girder which has a main girder and a horizontal girder, (a) is an overhead view, (b) is an aerial view. It is the perspective view which showed a mode that the floor slab on the steel girder shown in FIG. 5 was absent, (a) is an overhead view, (b) is an aerial view. It is the perspective view which showed the junction part of the joining example of the floor slab shown in FIG. 1, (a) is an overhead view, (b) is an aerial view. It is the perspective view which abbreviate | omitted the floor slab and showed the junction part shown in FIG. 7, (a) is an overhead view, (b) is an aerial view.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  1- (a) and (b) are steel girders 4 as shown in FIG. 6 and precast concrete floor slabs laid on and adjacent to the steel girders 4 as shown in FIG. 1 and 1 show a joining example in the case where the steel plate 4 is joined via a connecting plate 8 projecting on a flange 7 of the steel beam 4. In order to join the floor slab 1 to the adjacent floor slab 1 and to ensure the bending rigidity of the floor slab 1 itself, the floor slab 1 is circumferentially around the back side (at least both ends in the length direction (bridge axis direction)). A shape having continuous convex portions 2 is formed. The floor slab 1 is mainly made of reinforced concrete. Mortar mixed with reinforcing fibers may be used instead of concrete, but it is substantially equivalent to precast concrete.

  1-(a), (c) is a state in which the floor slabs 1, 1 adjacent (opposed) on the flange 7 of the steel girder 4 are supported by the flange 7, and each convex portion 2 of the floor slab 1, 1, 2 shows a state in which both floor slabs 1 and 1 are joined together by a bolt 9 passing through with a connecting plate 8 fixed on the flange 7 between the two, and shows a cross section of the line xx in (b). Yes. FIG. 1- (b) shows a state in which the floor slabs 1 and 1 joined to each other are viewed from the back side, and shows a cross section taken along the line yy passing through the upper surface of the flange 7 in (a) and (c). 7- (a) and (b) are omitted from the floor slabs 1 and 1 shown in FIG. The situation is shown in FIGS. 8- (a) and (b).

  In the example shown in the figure, in order to further increase the bending rigidity of the floor slab 1 and not to give directionality to the bending rigidity (so that there is no difference in bending rigidity in two directions), Although the ribs 3 in two directions protrude in a lattice shape in the enclosed inner region, the ribs 3 arranged in parallel in the width direction may be provided only in one direction. In that case, whether the length direction of the rib 3 is directed in the width direction of the floor slab 1 (in the direction perpendicular to the bridge axis) or in the axial direction (in the direction of the bridge axis), the floor slab 1 is directed to the main girder 41 of the steel girder 4. It depends on whether it is supported or supported by the cross beam 42. When the floor slab 1 is supported by the web 5 of the main girder 41, the rib 3 faces the width direction of the bridge girder (floor slab 1) (perpendicular to the bridge axis) and is supported by the web 5 of the cross girder 42 (lateral rib 6). In this case, the rib 3 faces the length direction (bridge axis direction) of the floor slab 1.

  A flange 5 as a bending resistance element is welded on the web 5 or the lateral rib 6 as a part of the steel girder 4 in a state where the web 5 or the lateral rib 6 protrudes on both sides in the width direction. To integrate. On the flange 7, one or a plurality of connecting plates 8 for joining adjacent floor slabs 1, 1 are provided in parallel with the web 5 or the lateral rib 6. As described above, a plate (steel plate) is mainly used as the connection plate 8, but a plate made of fiber reinforced plastic such as FRP may be used. When the connection plate 8 is a plate, it is welded to the flange 7, but when it is FRP or the like, it is fixed to the flange by adhesion, welding or the like.

  The web 5 indicates the web of the main girder 41 facing the bridge axis direction as shown in FIGS. 4 to 6, and the lateral rib 6 indicates the web of the cross beam 42 facing the direction perpendicular to the bridge axis. Hereinafter, the web 5 and the lateral rib 6 are collectively referred to as “web 5 etc.” depending on the case. The flange 7 is fixed to the web 5 or the like mainly by welding or the like, and the connection plate 8 is fixed to the flange 7 by welding or the like. For example, a steel material having a T-shaped cross section in which the flange 7 and the connection plate 8 are integrated in advance is used. The connecting plate 8 is projected on the web 5 or the like by welding to the web or the like.

  When one floor slab 1 is manufactured to have a length over the entire width of the bridge girder as shown in FIG. 5, the floor slabs 1 are arranged adjacent to each other in the bridge axis direction. The plates 1 and 1 are joined in a state of facing each other on the lateral rib 6 as shown in FIG. The floor slab 1 may be manufactured with a width in which the entire width of the bridge girder is divided into a plurality of widths. In that case, the floor slab 1 is arranged adjacent to the width direction of the bridge girder (perpendicular to the bridge axis). 1 and 1 are joined in a state of facing each other on the web of the main beam 41. 5- (a) and (b) show a state in which the floor slab 1 having a length extending over the entire width of the bridge girder is laid on the main girder 41 and the horizontal girder 42 shown in FIGS. 6 (a) and (b). Show.

  In the joining example shown in FIG. 1, floor slabs 1, 1 having convex portions 2 that are continuous in the circumferential direction around the back side (end portion) are placed on the flange 7 so as to face each other with a connection plate 8 interposed therebetween. The A bolt 9 is inserted through the connecting plate 8 between the convex portions 2 and 2 of the floor slabs 1 and 1 facing each other with the connecting plate 8 interposed therebetween, and the opposing floor slabs 1 and 1 are joined to the connecting plate 8. The

  In the example of FIG. 1, the bolt 9 is inserted through the convex portion 2 in the width direction. Therefore, an insertion hole 2 a is formed in the convex portion 2 when, for example, the floor slab 1 is manufactured, and the connection plate 8 is also used for inserting the bolt 9. An insertion hole 8a is formed. The floor slabs 1, 1 (projections 2, 2) are joined to the connection plate 8 while being joined to each other by screwing of a nut 91 to the bolt 9. Is inclined with respect to the side surface of the convex portion 2 on the seating surface of the washer that receives the nut 91.

  In FIG. 1 and the like, the floor slab 1 has a waffle slab shape in which ribs 3 and 3 are formed in two directions on the inner peripheral side of the convex portion 2, which are shown in FIGS. Thus, it is impossible to secure a length that allows the entire length of the bolt 9 to be accommodated in the concave portion surrounded by the two-way ribs 3 and 3 and adjacent to the convex portion 2 through which the bolt 9 is inserted.

  Therefore, prior to joining the convex portions 2, 2, by temporarily inserting the bolt 9 from the outer peripheral side of the floor slab 1 into the insertion hole 2 a of the convex portion 2 of one floor slab 1, After placing the other floor slab 1 on the flange 7, the bolt 9 can be pushed out or pulled out to the other floor slab 1 side and inserted into the convex portion 2. In this relation, it is appropriate to use a bolt (long screw) having no head for the bolt 9 so that the bolt 9 can be inserted from the outer peripheral side of the floor slab 1 into the insertion hole 2a of the convex portion 2. If the bolt 9 can be inserted into the insertion hole 2a of the convex portion 2 from within the concave portion adjacent to the convex portion 2, a bolt with a head can also be used. FIG. 1- (c) shows that the axis of the bolt 9 is curved in order to eliminate the need for the bolt 9 to be inserted into the insertion hole 2a of the convex portion 2 of the floor slab 1 and temporarily fixed. The floor slab 1 with the bolt 9 when the bolt 9 can be inserted into the insertion holes 2a, 2a of the both floor slabs 1, 1 even after installing the opposing floor slabs 1, 1 on the flange 7, 1 shows an example of joining. The bolt 8 shown in FIG. 1- (c) is also used when the bolt 9 is inserted through the floor slabs 1 and 1 (projections 2 and 2) and the connecting plate 8 in the examples shown in FIGS. Is possible.

  Since the floor slab 1 is made of precast concrete, the insertion hole 2a of the convex part 2 through which the bolt 9 is inserted is basically formed when the floor slab 1 is manufactured, but it is not drilled in the field. Absent. As shown in FIG. 1- (b), a plurality of insertion holes 2a are formed at intervals in the lengthwise direction in each convex portion 2, but when the interval between the ribs 3 and 3 is large, a single concave portion is formed. In addition, a plurality of insertion holes 2 a may be formed in the length direction of the connection plate 8. The insertion hole 8 a of the connection plate 8 is formed in advance at a position corresponding to the formation position of the insertion hole 2 a of the convex portion 2.

  In the figure, holes formed in the length direction of the convex part 2 and rib 3 part of the floor slab 1 are insertion holes 1a through which a PC steel material for introducing prestress into the floor slab 1 is inserted. Is shown. Since the PC steel material is disposed in at least one of the cross section (length direction) of the convex portion 2 and the rib 3 of the floor slab 1, in FIG. 4, in the width direction (bridge axis direction) and axial direction ( The insertion holes 1a are formed in both of the direction perpendicular to the bridge axis), and the insertion holes 1a are formed in at least one of the width direction (bridge axis direction) and the axial direction (bridge axis perpendicular direction) of the floor slab 1. Will be.

  Since the connection plate 8 is formed with an insertion hole 8a through which the bolt 9 is inserted (penetrated), in the drawing, as a specific example of the connection plate 8 as shown in FIG. A perforated steel plate with holes formed at regular intervals is used. In this case, some holes of the perforated steel plate as the connection plate 8 are used as the insertion holes 8a. However, when a perforated steel plate is used for the connection plate 8, the rear portion between the convex portions 2 and 2 facing each other is used. In addition to the adhesive force on both sides of the connecting plate 8 (perforated steel plate), the supporting pressure of the filler 10 existing in the hole is filled with the filler 10 such as mortar, concrete, adhesive, etc. There is an advantage that the shear resistance force is expected as a resistance force against the shear force acting in the length direction of the connection plate 8.

  After joining the floor slabs 1, 1 (projections 2, 2) with the bolt 9, the clearance (joint) between the side surfaces of the opposing floor slabs 1, 1 is filled with a filler 10 such as mortar, concrete, adhesive, etc. At the same time as the clearance is filled, the upper end surface of the filler 10 in the clearance is aligned with the upper surfaces (top end surfaces) of the adjacent floor slabs 1 and 1. The filler 10 is filled between the floor slabs 1 and 1 so that the filler 10 acts in the axial direction of the web 5 and the like, and with respect to a shearing force that tends to cause a displacement deformation between the web 5 and the floor slab 1. The connecting plate 8 integrated with the web 5 and the like and the floor slabs 1 and 1 are made to behave integrally to prevent displacement deformation. The filler 10 is also filled in the insertion hole 2a of the convex portion 2 communicating with the clearance between the side surfaces of the floor slabs 1 and 1, and fills the clearance in the insertion hole 2a.

  2 (a) and 2 (b), the connecting plates 8 and 8 in FIG. 1 are integrated on both sides in the width direction of the flange 7 by welding or the like, and each connecting plate 8 is inserted into each convex portion 2 of the floor slab 1. In this state, an example of joining in the case where the floor slabs 1 and 1 are joined by the bolts 9 penetrating the both convex portions 2 and 2 of the opposing floor slabs 1 and 1 and the connecting plates 8 and 8 at the same time is shown. As shown in FIG. 1, this joining example is an intermediate form between the joining example in which the bolt 9 penetrates the convex part 2 and the joining example in which the connection plate 8 is inserted into the convex part 2 as shown in FIG. 3 described later. Equivalent to. In the example of FIG. 2, the connecting plate 8 is inserted into the convex portion 2 of the floor slab 1, and the bolt 9 is inserted through the convex portions 2, 2 and the connecting plates 8, 8. When manufacturing 1 or the like, a groove (slit) into which the connection plate 8 is inserted and an insertion hole 2a are formed.

  In the example in which the connection plates 8 positioned on both sides in the width direction of the flange 7 are inserted into the convex portion 2 as shown in FIG. 2A, the connection plate 8 is inserted into the convex portion 2 in advance when the floor slab 1 is manufactured. In some cases, the floor slab 1 is manufactured in an embedded state, and the connecting plate 8 is inserted into the convex portion 2 at the site. In the latter case, a groove (slit) for the connection plate 8 to enter from the bottom surface side is formed in the convex portion 2, but the groove has mortar, concrete so as not to come out from the state where the connection plate 8 is inserted into the groove. Further, a curable material such as an adhesive is filled, and the unity between the convex portion 2 (floor slab 1) and the connection plate 8 is ensured. In the case of the example shown in FIG. 2A, the filler 10 is filled between the convex portions 2 and 2 of the opposing floor slabs 1 and 1, and the upper end surfaces of the joints are aligned with the top end surfaces of both floor slabs 1 and 1. The filler 10 is also filled in the insertion hole 2a of the convex portion 2.

  2- (b) is an example shown in FIG. 2- (a), on the center portion in the width direction of the flange 7 between the convex portions 2, 2 of the floor slab 1, 1 facing each other as in the example shown in FIG. In this example, the connection plate 8 is also arranged on the flange 7 and fixed to the upper surface of the flange 7 by welding or the like. In the example shown in FIG. 2B, the bolts 9 passing through the convex portions 2 and 2 of the opposing floor slabs 1 and 1 are fixed on the connecting plate 8 inserted into each convex portion 2 and the flange 7. By passing through the connecting plate 8, when the floor slab 1 is subjected to a bending moment due to a vertical load, the restraining effect on the bolt 9 positioned at the end of the floor slab 1 is increased, so that the stability of the floor slab 1 against deformation is increased. And resistance to bending moment are improved. Further, when the floor slab 1 receives a force to move relative to the web 5 or the like in the axial direction of the web 5 or the like, the connection plate 8 on the flange 7 exhibits a shear resistance force due to a support pressure and an adhesion force. Therefore, the stability against the displacement of the floor slab 1 with respect to the web 5 or the like is also improved.

  FIG. 3 shows the two connecting plates 8 and 8 positioned on both sides in the width direction of the flange 7 shown in FIG. 2A when the web 5 is seen from the side of the web 5 or the like. The example of joining the floor slabs 1 and 1 and the web 5 etc. at the time of extending to the overlapping degree is shown. In this example, the connecting plates 8 and 8 located on both sides of the flange 7 in the width direction are connected to the web 5 by the portions projecting to the web 5 and the like side (downward) and the bolts 9 penetrating the web 5 and the like. On the other hand, the floor slabs 1, 1 are indirectly joined to the web 5 or the like by inserting the connecting plate 8 into the convex portions 2 of the floor slabs 1, 1 placed on the flange 7. 3A shows a cross section taken along line xx in FIG. 3B, and FIG. 3B shows a cross section taken along line yy in FIG.

  In this example, the bolt 9 basically passes through the connecting plates 8 and 8 and the web 5 and does not penetrate the convex portion 2 of the floor slab 1, so that the joining example of FIG. 3 is convex as in the example shown in FIG. When the bolt 9 cannot be pushed out from the concave portion facing the portion 2 to the convex portion 2 side, that is, the side (direction) through which the bolt 9 is inserted into the convex portion 2 is limited to the outer peripheral side of the floor slab 1. In such a case, or when it is difficult to insert the bolt 9 into the convex portion 2, this is an effective joining method. Therefore, in the example of FIG. 3, since there is no restriction | limiting in the form of the volt | bolt 9, it is possible to use the volt | bolt which has a head in the volt | bolt 9. FIG.

  In the joining example of FIG. 3, when the connection plates 8 and 8 located on both sides in the width direction of the flange 7 are fixed to the flange 7 by welding or the like, there is a gap between the connection plate 8 and the web 5 or the like. However, since the reaction force of the bolt 9 can be obtained, the nut 91 can be fastened to the bolt 9. On the other hand, when the connection plate 8 is not fixed to the flange 7, the connection plate 8 is not stable, so that the gap between the connection plate 8 and the web 5 or the like is filled as shown in FIG. A spacing plate 11 such as a filler plate or a shape steel for bearing a reaction force of force is interposed. In FIG. 3, a plurality of sheets together with the web 5 and the like and a filler plate having a thickness corresponding to the width of the flange 7 are sandwiched between the web 5 and the connection plate 8. It need not be a single plate, and not necessarily steel, but hard plastics or other materials can also be used.

  When the connecting plates 8 and 8 located on both sides in the width direction of the flange 7 are not welded to the flange 7 in the joining example of FIG. 3, the convex portion 2 is about to rotate due to the bending moment acting on the floor slab 1. Since the center of is located on the axis of the bolt 9, there is a possibility that an opening will occur between the floor slabs 1 and 1 facing each other as compared with the joining examples of FIGS. 1 and 2. If there is such a possibility, the bolt 9 is inserted between the convex portions 2 and 2 facing each other as shown by a two-dot chain line in FIG. Thus, it is possible to enhance the restraining effect on the rotation of the floor slabs 1 and 1 (projections 2 and 2).

  In FIG. 3- (a), a connecting plate 8 is projected on the flange 7 between the opposing convex portions 2 and 2 on the flange 7 as shown by a two-dot chain line in the same manner as in FIG. 2- (b). Then, by passing through the connecting plate 8 and inserting the bolt 9 between the convex portions 2 and 2, the restraining effect on the bolt 9 is enhanced, the stability of the bolt 9 against bending deformation and the bending of the floor slab 1 thereby. Increases stability against deformation. In this case, the connecting plate 8 protrudes between the convex portions 2 and 2 facing each other on the flange 7, and the bolts 9 pass through the connecting plate 8 together with the convex portions 2 and 2, thereby adjacent floor slabs 1 and 1. Are also capable of preventing the relative movement (displacement) of the webs 5 in the axial direction of the web 5 or the like, or the relative movement (displacement) of each floor slab 1 in the axial direction of the web 5 or the like.

  In FIG. 3A, the filler 10 filled between the opposing convex portions 2 and 2 fills the clearance (joint) between the side surfaces of the opposing floor slabs 1 and 1, and at the same time, the connecting plate 8 and the bolt 9. Is protected from the outside air, and the top end surfaces of the adjacent floor slabs 1 and 1 are finished to be flush with each other. Further, when the connection plate 8 protrudes from the flange 7 as indicated by a two-dot chain line, the filler 10 is filled into the insertion hole 8a of the connection plate 8 positioned between the convex portions 2 and 2. Thus, it is expected to exert a resistance against a shearing force acting in the axial direction of the web 5 or the like.

1 ... Floor slab, 1a ... Insertion hole (for PC steel), 2 ... Projection, 2a ... Insertion hole (for bolt), 3 ... Rib,
4 ... Steel girders, 41 ... Main girders, 42 ... Cross girders, 5 ... Web, 6 ... Lateral ribs,
7 ... Flange, 8 ... Connection plate, 8a ... Insertion hole, 9 ... Bolt, 91 ... Nut,
10: Filler, 11: Spacing material.

Claims (9)

It is a joint structure between a steel girder and a precast concrete floor slab laid on and adjacent to the steel girder,
A connecting plate protrudes in parallel with the web or the lateral rib on a flange that is integrated on the web or the lateral rib that is a part of the steel beam and projects on both sides of the web or the lateral rib in the width direction. , on the flange, the floor plate having a convex portion that is continuous with the periphery of the rear side in the circumferential direction, is placed on opposite sides of the connection plate, between the respective convex portions of both deck to the counter to the connecting plate inserted bolt through the, it is bonded to the steel girder both deck to the counter via the connecting plate,
A steel girder and a concrete floor slab, wherein the bolts join the both floor slabs to each other, join the both floor slabs to the connecting plate, and restrain the both floor slabs to the steel girders, Joint structure. The joint structure of a steel girder and a concrete floor slab according to claim 1, wherein the bolt faces the direction in which the two floor slabs face each other. It is a joint structure between a steel girder and a precast concrete floor slab laid on and adjacent to the steel girder,
A connecting plate parallel to the web or the transverse rib at the both sides in the width direction of the flange which is integrated on the web or the transverse rib which is a part of the steel girder and which protrudes on both sides of the web or the transverse rib in the width direction However, the floor slabs are joined in a state in which a part in the width direction protrudes upward from the upper surface of the flange, and the floor slabs having convex portions continuous in the circumferential direction around the back surface are opposed to each other on the flange. The connecting plate is inserted into the convex portion, a bolt is inserted between the convex portions of the opposing floor slabs through the connecting plate, and the opposing floor slab is connected to the convex portion. A joint structure between a steel girder and a concrete slab, wherein the steel girder is joined to the steel girder via a plate. Connected plates projecting on the flange, the connection plate on the flange, according to claim 3, wherein opposing said bolt inserted through the convex portion of the slab is characterized in that through Joint structure of steel girder and concrete slab. It is a joint structure between a steel girder and a precast concrete floor slab laid on and adjacent to the steel girder,
A connecting plate parallel to the web or the transverse rib at the both sides in the width direction of the flange which is integrated on the web or the transverse rib which is a part of the steel girder and which protrudes on both sides of the web or the transverse rib in the width direction However, a part of the width direction protrudes upward from the upper surface of the flange and protrudes downward from the lower surface of the flange. On the flange, a convex continuously extending around the back side. The floor slab having a portion is placed opposite to each other, and the connecting plate is inserted into the convex portion, and the web or the lateral rib is interposed between portions of the connecting plate that protrude downward from the lower surface of the flange. A joint structure between a steel girder and a concrete floor slab, wherein a bolt is inserted through the steel girder and the opposing floor slab is joined to the steel girder via the connection plate. In addition to the bolt passing through the web or the lateral rib, the bolt passes through the convex portion of the floor slab placed facing the flange and the connection plate inserted therein. The joint structure of a steel girder and a concrete floor slab according to claim 5 . The flange on the connection plate is projected, according to claim 5 wherein the convex portion of the placed the slab on said flange, characterized in that on opposite sides of the connection plate on the flange, Or the junction part structure of the steel girder of Claim 6 and a concrete floor slab. A spacing member is interposed between the connecting plate and the web or the lateral rib facing each other with the flange interposed therebetween, and the spacing between the connecting plate and the web or the lateral rib is maintained. The joint structure of a steel girder and a concrete floor slab according to any one of claims 5 to 7 . The steel girder according to any one of claims 1 to 8 , wherein a clearance is secured between the convex portions of the floor slab facing on the flange, and the clearance is filled with a filler. And joint structure of concrete floor slab.

Images