Floor slab support structure

Abstract

To provide a floor slab support structure capable of reducing the number of components and being constructed in a state where a floor slab separated from a girder can be used as a road without traffic interruption.SOLUTION: A floor slab support structure 1 according to the present invention is configured such that a floor slab 3 joined to a girder 2 of a bridge 100 is cut along a horizontal direction, and a load of the floor slab 3 separated from the girder 2 and a load of a vehicle traveling on the floor slab separated from the girder are transmitted to the girder. The load of the cut floor slab 3 and the load of a vehicle traveling on the floor slab separated from the girder are configured to be transmitted to the girder 2 through load transmission means provided in a cutting groove 31 generated by cutting the floor slab 3 and the load transmission means is constituted of a load transmission plate 10 fitted into the cutting groove 31.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a floor slab support structure for supporting a floor slab separated from girders on the girders.

Background Art

[0002] Conventionally, in floor slab renewal work for renewing a reinforced concrete floor slab of a bridge such as a road bridge, a railway bridge, or a waterway bridge with a new floor slab, since existing girders are reused, the floor slab provided on the girders and joined to the girders is cut, separated from the girders, removed, and then a new floor slab is joined on the girders. In floor slab renewal work, after repeatedly performing floor slab cutting work for cutting the floor slab in the renewal planned area using a cutting device such as a wire saw and separating it from the girders, and floor slab removal work for removing the floor slab separated from the girders, floor slab joining work for joining a new floor slab on the girders from which the floor slab has been removed must be performed. Therefore, the time required for floor slab renewal work in the renewal planned area becomes long. In this case, since the road must be closed during the period from the floor slab cutting work to the end of the floor slab joining work, the continuous road closure period becomes long, and the disadvantages to the road administrator and road users associated with the road closure increase. Therefore, as a measure to enable the floor slab separated from the girders to be used as a road during the period from cutting the floor slab from the girders to removing the floor slab separated from the girders, and to secure a traffic release period on the bridge, a synthetic structure in which the floor slab separated from the girders and the girders are synthesized is known (see Patent Document 1). The synthetic structure includes a post-construction anchor provided at a cutting surface in a haunch portion of the floor slab, a fastening member provided on the girder, a space holding member driven into a gap formed in the haunch portion by cutting, a filling material filled in this gap, and a synthetic jig.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0004] However, in the synthetic structure disclosed in Patent Document 1, in a state where a space holding material is disposed in a gap formed in the haunch portion by cutting (that is, the state shown in FIG. 5(c) of Patent Document 1), the floor slab separated from the girder cannot be stably supported by the space holding material. That is, a synthetic structure is configured that can stably support a floor slab separated from a girder by using a space holding material, a post-construction anchor, a fastening member provided on the girder, a filling material such as mortar filled in the gap, and a synthetic jig. Therefore, in the floor slab support structure using the synthetic structure disclosed in Patent Document 1, there are problems such as complicated construction and increased construction costs due to a large number of components. Further, in the case of the synthetic structure disclosed in Patent Document 1, after the floor slab is separated from the girder, until the synthetic structure is completed, the floor slab separated from the girder cannot be used as a road, so the road must be closed to traffic. That is, in the synthetic structure, the load of the floor slab separated from the girder and the vehicle traveling on the floor slab is shared by the space holding material and the mortar and applied to the entire main girder, so that the floor slab can be stably supported. Therefore, when adopting the synthetic structure, a synthetic jig is installed, the gap formed in the haunch portion by working cutting is filled with mortar, and until the mortar is cured and the floor slab is stably supported by the cured mortar and the synthetic jig on the main girder, the floor slab separated from the girder cannot be used as a road. Thus, when adopting the synthetic structure, there is a problem that it is necessary to close the road during the construction period from when the floor slab is cut until the synthetic structure is completed. The present invention has been made in view of the above problems, and provides a floor slab support structure that can reduce the number of components and can be constructed in a state where the floor slab separated from the girder can be used as a road without closing the road to traffic.

Means for Solving the Problems

[0005] The floor slab support structure according to the present invention is a floor slab support structure configured to transmit the load of the floor slab cut along the horizontal direction and separated from the girder and the load of the vehicle traveling on the floor slab separated from the girder to the girder. The load of the cut floor slab and the load of the vehicle traveling on the floor slab separated from the girder are transmitted to the girder through load transmission means installed in the cut groove generated by the cutting of the floor slab. The load transmission means is characterized by being constituted by a load transmission plate fitted into the cut groove. According to the floor slab support structure of the present invention, it has become possible to provide a floor slab support structure that can reduce the number of components and can be constructed in a state where the floor slab separated from the girder can be used as a road without closing the road to traffic. Further, since the load transmission plate is characterized by being constituted by a plurality of plates stacked one on top of the other, it is possible to provide a floor slab support structure that can support the floor slab separated from the girder more stably. Further, since the plate is a flat plate, the construction becomes easy and the construction cost can be suppressed. Further, since the load transmission plate is characterized by being installed so as to penetrate the cut groove along the direction perpendicular to the bridge axis, it is possible to provide a floor slab support structure that can support the floor slab separated from the girder more stably. Further, the load transmission plate includes a one-end-side load transmission plate installed so as to be inserted from an opening on one end side of the cut groove located on one end side in the direction perpendicular to the bridge axis of the cut groove and reach near the central position in the width direction of the cut groove, and the other-end-side load transmission plate installed so as to be inserted from an opening on the other end side of the cut groove located on the other end side in the direction perpendicular to the bridge axis of the cut groove and reach near the central position in the width direction of the cut groove. Therefore, the ease of construction is improved, and it is possible to provide a floor slab support structure that can stably support the floor slab separated from the girder. Further, one end side load transfer plate and the other end side load transfer plate each include a lower plate installed to reach near the central position in the cutting groove width direction within the cutting groove, an upper plate installed to reach near the central position in the cutting groove width direction within the cutting groove, and a middle plate inserted between the lower plate and the upper plate installed in the cutting groove and installed to reach near the central position in the cutting groove width direction within the cutting groove. Therefore, a floor slab support structure capable of more stably supporting the floor slab separated from the girder can be provided. Also, since a plurality of load transfer plates are provided and the plurality of load transfer plates are installed at predetermined intervals along the bridge axis direction of the cutting groove, a floor slab support structure capable of more stably supporting the floor slab separated from the girder can be provided. Further, since it includes a filling material injected into the cutting groove between one load transfer plate and the other load transfer plate installed adjacent to each other at predetermined intervals along the bridge axis direction of the cutting groove, a floor slab support structure capable of stably supporting the floor slab separated from the girder over a long period can be constructed, and a floor slab support structure suitable for a case where the period during which the floor slab separated from the girder is used as a road is long can be provided. Further, since it includes a plate material installed in the cutting groove into which the filling material is injected between one load transfer plate and the other load transfer plate installed adjacent to each other at predetermined intervals along the bridge axis direction of the cutting groove, a floor slab support structure capable of more stably supporting the floor slab separated from the girder over a long period can be constructed, and a floor slab support structure suitable for a case where the period during which the floor slab separated from the girder is used as a road is long can be provided.

Brief Description of the Drawings

[0006]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying out the Invention

[0007] As shown in Fig. 1, the floor slab support structure 1 according to the present invention is configured such that the floor slab 3, which was joined to the girder 2 of the bridge 100, is cut along the horizontal direction (the bridge axis direction X of the bridge 100 and the direction Y perpendicular to the bridge axis of the bridge 100), and the load of the floor slab 3 separated from the girder 2 and the load of the vehicle traveling on the floor slab 3 separated from the girder are transmitted to the girder 2. The floor slab support structure is provided with load transmission means installed in the cutting groove 31 generated by the cutting of the floor slab 3, and is configured to transmit the load of the cut floor slab 3 and the load of the vehicle traveling on the floor slab separated from the girder to the girder 2. The load transmission means is constituted by a load transmission plate 10 fitted into the cutting groove 31. The load transmission plate 10 is fitted into the cutting groove 31 by being driven into the cutting groove 31 using, for example, a hammer or the like. Hereinafter, the floor slab 3 that has been cut and separated from the girder 2 will be referred to as the "separated floor slab 3". According to the floor slab support structure of the present invention, as a component, there is only the load transmission plate 10 fitted into the cutting groove 31, and since the number of components is reduced, workability is improved and an effect of suppressing construction costs can be obtained. In addition, since a floor slab support structure that can stably support the separated floor slab 3 immediately after the floor slab 3 is cut by a predetermined length along the bridge axis direction X of the bridge 100 is established, it is possible to provide a floor slab support structure that can be constructed in a state where the floor slab separated from the girder can be used as a road without closing the road to traffic.

[0008] As shown in Fig. 1, the bridge 100 is a road bridge, a railway bridge, a waterway bridge, etc. The bridge 100 has a configuration in which the floor slab 3 is supported by bridge piers 2F (see Fig. 1(b)) via the girder 2. After the floor slab 3 is cut at the cutting target part 30 of the floor slab 3 and the floor slab 3 is separated from the girder 2, the separated floor slab 3 is supported by the floor slab support structure 1 according to the present invention, and the separated floor slab 3 can be used as a road. As the girder 2, as shown in Fig. 1(b), there are a box-shaped (cross-sectional L-shaped) main girder 2A, an I-shaped (cross-sectional I-shaped) main girder 2B, etc.

[0009] Embodiment 1 As shown in Fig. 2, in the floor slab support structure 1 according to Embodiment 1, in a floor slab support structure configured to transmit the load of the separated floor slab 3 and the load of a vehicle traveling on the separated floor slab 3 to the girder via a load transfer plate 10 fitted into a cutting groove 31 generated by cutting the floor slab 3, the load transfer plate 10 is composed of a plurality of plates stacked one above the other, for example, a lower plate 11 and an upper plate 12. The lower plate 11 is installed in the cutting groove 31 so as to penetrate the cutting groove 31 along the direction Y perpendicular to the bridge axis, and is composed of, for example, a flat plate whose lower surface contacts the groove lower surface (lower cutting surface of the cutting groove 31) 31a of the cutting groove 31. The upper plate 12 is composed of, for example, a flat plate fitted between the lower plate 11 and the groove upper surface (upper cutting surface of the cutting groove 31) 31b of the cutting groove 31 that becomes the lower surface of the separated floor slab 3. In practice, since the surface accuracy (cutting accuracy) of the groove lower surface (lower cutting surface of the cutting groove 31) 31a and the groove upper surface (upper cutting surface of the cutting groove 31) 31b of the cutting groove 31 is not constant, the contact between the lower plate 11 and the groove lower surface 31a of the cutting groove 31 and the contact between the upper plate 12 and the groove upper surface 31b of the cutting groove 31 are unlikely to be full-surface contacts.

[0010] The upper plate 12 is composed of, for example, a one-end-side upper plate 12A fitted between the lower plate 11 installed in the cutting groove 31 and the lower surface of the separated floor slab 3 (groove upper surface 31b of the cutting groove 31) on the cutting groove one-end-side opening 31L side located at one end in the direction Y perpendicular to the bridge axis of the cutting groove 31, and a the other-end-side upper plate 12B fitted between the lower plate 11 fitted in the cutting groove 31 and the lower surface of the separated floor slab 3 (groove upper surface 31b of the cutting groove 31) on the cutting groove other-end-side opening 31R side located at the other end in the direction Y perpendicular to the bridge axis of the cutting groove 31.

[0011] In Embodiment 1, in the floor slab cutting work, considering the self-weight of the separated floor slab 3 and the like, after cutting the floor slab 3 by a predetermined length along the bridge axis direction X of the bridge 100 so that damage such as cracks does not occur in the separated floor slab 3, the floor slab support structure 1 is constructed. The cutting length of this predetermined length, that is, the cutting length along the bridge axis direction X within the allowable range in which damage such as cracks does not occur in the floor slab, is obtained, for example, by FEM (finite element method) analysis. The cutting length of the specified length is, for example, about 1.5 m.

[0012] And the floor slab support structure 1 according to Embodiment 1 is a floor slab support structure in which after the floor slab 3 is cut by the above-described specified length along the bridge axis direction X, one or more load transfer plates 10 are inserted into the cut groove 31 generated by the cutting and installed. For example, as shown in FIG. 3, a plurality of load transfer plates 10, 10... are arranged at a predetermined interval b along the bridge axis direction X of the cut groove 31. That is, in the floor slab support structure 1 according to Embodiment 1, after the floor slab 3 is cut by a predetermined length along the bridge axis direction X of the bridge 100, the load of the separated floor slab 3 and the load of the vehicle traveling on the separated floor slab 3 are transmitted to the girder 2 via one or more load transfer plates 10. In addition, as shown in FIG. 3, when a plurality of load transfer plates 10, 10... are arranged at a predetermined interval b along the bridge axis direction X of the cut groove 31, the relationship between the plate width dimension a in the direction along the bridge axis direction X of the load transfer plate 10 and the above-described predetermined interval b is set such that a < b. Further, for the one-end side upper plate 12A and the other-end side upper plate 12B, those having a plate width dimension in the direction along the bridge axis direction X that is equal to or less than the plate width dimension a of the lower plate 11 are used. In addition, the length dimension in the direction along the direction perpendicular to the bridge axis Y of the one-end side upper plate 12A and the other-end side upper plate 12B is preferably set to a length that can ensure an insertion length into the cut groove 31 of at least about 1 / 5 or more of the lateral width length W in the direction along the direction perpendicular to the bridge axis Y of the cut groove 31.

[0013] According to the floor slab support structure 1 according to Embodiment 1, as components, there is only one or more load transfer plates 10 inserted and installed in the cut groove 31, and since the number of components is reduced, the workability is improved and an effect of suppressing the construction cost is obtained. Further, according to the floor slab support structure 1 according to Embodiment 1, since the floor slab support structure 1 that can stably support the separated floor slab 3 immediately after the floor slab 3 is cut by the above-described predetermined length along the bridge axis direction X of the bridge 100 is established, it has become possible to provide a floor slab support structure 1 that can be constructed in a state where the separated floor slab 3 can be used as a road without closing the road to traffic.

[0014] Embodiment 2 As shown in FIGS. 4 and 5, in the floor slab support structure 1 according to Embodiment 2, after the floor slab 3 is cut by the above-described predetermined length along the bridge axis direction X of the bridge 100, a plurality of load transfer plates 10, 10... are installed in the cut groove 31 at a predetermined interval b along the bridge axis direction X of the cut groove 31, and a filler 7 is injected into the cut groove 31 between one load transfer plate 10 and the other load transfer plate 10 installed adjacent to each other at a predetermined interval b along the bridge axis direction X of the cut groove 31. Then, a plate material 13 is installed in the cut groove 31 in which the filler 7 is injected between one load transfer plate 10 and the other load transfer plate 10. That is, the floor slab support structure 1 according to Embodiment 2 includes a plurality of load transfer plates 10, 10... installed at a predetermined interval b along the bridge axis direction X of the cut groove 31, a filler 7 injected into the cut groove 31 between one load transfer plate 10 and the other load transfer plate 10 installed adjacent to each other at a predetermined interval b along the bridge axis direction X of the cut groove 31, and a plate material 13 installed in the cut groove 31 in which the filler 7 is injected. The plate material 13 is composed of, for example, one plate material 13A and the other plate material 13B composed of flat plates. Further, as the filler 7, for example, mortar or an adhesive is used.

[0015] The construction method of the floor slab support structure 1 according to Embodiment 2 is a method including a load transfer plate installation step, a filler injection step, and a plate material installation step. An overview of the construction method of the floor slab support structure 1 according to Embodiment 2 is shown in FIG. 5. In the load transfer plate installation step, after the floor slab 3 is cut by the above-described predetermined length along the bridge axis direction X of the bridge 100, as shown in FIGS. 5(a) and 5(b), a plurality of load transfer plates 10, 10 are installed in the cutting groove 3 at a predetermined interval b along the bridge axis direction X of the cutting groove 31. In the filler injection step, for example, mortar (filler 7) is injected into the cutting groove 31 between one load transfer plate 10 and the other load transfer plate 10 installed adjacent to each other in the cutting groove 31 at a predetermined interval b along the bridge axis direction X of the cutting groove 31 (see FIGS. 5(c) and 5(d)). In the plate installation step, with respect to the cutting groove 31 into which mortar is injected between one load transfer plate 10 and the other load transfer plate 10 installed adjacent to each other at a predetermined interval b along the bridge axis direction X of the cutting groove 31, one plate member 13A is inserted and installed from the cutting groove one-end side opening 31L described above, and the other plate member 13B is inserted and installed from the cutting groove other-end side opening 31R described above (see FIGS. 5(c), 5(d), 5(e), and 5(f)). Note that one plate member 13A is configured to be inserted from the cutting groove one-end side opening 31L and installed such that the insertion-side tip reaches near the center position in the cutting groove width direction, and the other plate member 13B is configured to be inserted from the cutting groove other-end side opening 31R and installed such that the insertion-side tip reaches near the center position in the cutting groove width direction.

[0016] According to the floor slab support structure 1 according to the second embodiment, the same effects as those of the floor slab support structure 1 according to the first embodiment can be obtained. Furthermore, according to the floor slab support structure 1 according to Embodiment 2, in the process of inserting the plate material 13 (one plate material 13A and the other plate material 13B) into the cutting groove 31 between one load transfer plate 10 and the other load transfer plate 10, when the mortar is pressed against the plate material 13, the mortar enters between the plate material 13 and the lower groove surface 31a of the cutting groove 31, and between the plate material 13 and the upper groove surface 31b of the cutting groove 31. Also, the mortar enters between one load transfer plate 10 and the lower groove surface 31a of the cutting groove 31, and between one load transfer plate 10 and the upper groove surface 31b of the cutting groove 31. Furthermore, the mortar enters between the other load transfer plate 10 and the lower groove surface 31a of the cutting groove 31, and between the other load transfer plate 10 and the upper groove surface 31b of the cutting groove 31. Then, when the mortar hardens, the integrality between one load transfer plate 10 and the other load transfer plate 10, the plate material 13, and the lower groove surface 31a of the cutting groove 31, and the integrality between one load transfer plate 10 and the other load transfer plate 10, the plate material 13, and the upper groove surface 31b of the cutting groove 31 are improved. Thus, it becomes possible to construct the floor slab support structure 1 that can stably support the separated floor slab 3 over a long period of time, and it becomes possible to provide the floor slab support structure 1 suitable for the case where the period of using the separated floor slab 3 as a road extends over a long period of time.

[0017] In Embodiments 1 and 2, for example, steel plates were used as the load transfer plates 10 (lower plate 11, upper plate 12) and the plate materials 13 (one plate material 13A, the other plate material 13B). For example, when the vertical width dimension between the upper and lower parts of the cutting groove 31 is 10 mm and the lateral width length W of the cutting groove 31 is 420 mm, the plate width dimension a in the direction along the bridge axis direction X of the load transfer plate 10 is 100 mm, the predetermined interval b between one load transfer plate 10 and the other load transfer plate 10 is 400 mm, the plate width dimension of the plate material 13 in the direction along the bridge axis direction X is set to a dimension slightly smaller than 400 mm, which is the dimension of the predetermined interval b, and the lower plate 11 and the plate material 13 used steel plates with a plate thickness dimension of 6 mm. In practice, the surface accuracy (cutting accuracy) of the lower surface (lower cutting surface) 31a of the cutting groove 31 and the upper surface (upper cutting surface) 31b of the cutting groove 31 is not constant, and the gap between the lower plate 11 and the upper surface 31b of the cutting groove 31 is also not constant. Therefore, as the upper plate 12, a plate with a plate thickness dimension corresponding to the gap between the lower plate 11 and the upper surface 31b of the cutting groove 31 is used, or a plurality of upper plates 12 are inserted so as to overlap vertically according to the gap between the lower plate 11 and the upper surface 31b of the cutting groove 31.

[0018] Embodiment 3 As shown in FIG. 6, in the floor slab support structure 1 according to Embodiment 3, in the floor slab support structure configured to transmit the load of the separated floor slab 3 and the load of the vehicle traveling on the separated floor slab 3 to the girder 2 through the load transmission plate 10 inserted into the cutting groove 31 generated by cutting the floor slab 3, the load transmission plate 10 is a floor slab support structure composed of a plurality of plates stacked vertically, for example, a lower plate 14 and an upper plate 15. The lower plate 14 is inserted into the cutting groove 31 so as to penetrate the cutting groove 31 in the direction perpendicular to the bridge axis Y, and is composed of, for example, a flat plate whose lower surface contacts the lower surface 31a of the cutting groove 31. The upper plate 15 is inserted between the lower plate 11 inserted into the cutting groove 31 and the upper surface 31b of the cutting groove 31 which is the lower surface of the separated floor slab 3 so as to penetrate the cutting groove 31 in the direction perpendicular to the bridge axis Y, and is composed of, for example, a flat plate that contacts the lower plate 11 and the upper surface 31b of the cutting groove 31. As the upper plate 15 constituting the load transmission plate 10, a plate having a plate width dimension in the direction along the bridge axis X and a length dimension in the direction along the direction perpendicular to the bridge axis Y that are equal to or smaller than those of the lower plate 14 is used.

[0019] Also in Embodiment 3, in the floor slab cutting work, considering the self-weight of the separated floor slab 3 and the like, after cutting the floor slab 3 by the predetermined length along the bridge axis direction X of the bridge 100 so that damage such as cracks does not occur in the separated floor slab 3, the floor slab support structure 1 is constructed. Then, the floor slab support structure 1 according to Embodiment 3 uses a load transfer plate 10 composed of a lower plate 14 and an upper plate 15. After the floor slab 3 is cut by a predetermined length along the bridge axis direction X, one or more load transfer plates 10 are inserted into the cut groove 31 generated by the cutting and installed. For example, as shown in FIG. 7, a plurality of load transfer plates 10, 10... are arranged at a predetermined interval b along the bridge axis direction X of the cut groove 31. That is, in the floor slab support structure 1 according to Embodiment 3, after the floor slab 3 is cut by a predetermined length along the bridge axis direction X of the bridge 100, the load of the separated floor slab 3 and the load of the vehicle traveling on the separated floor slab 3 are transmitted to the girder 2 through one or more load transfer plates 10. In addition, in the floor slab support structure 1 according to Embodiment 3, as shown in FIG. 7, the relationship between the plate width dimension a in the direction along the bridge axis direction X of the load transfer plate 10 and the above-mentioned predetermined interval b is set such that a > b.

[0020] According to the floor slab support structure 1 according to Embodiment 3, the same effect as the floor slab support structure 1 according to Embodiment 1 can be obtained. Moreover, according to the floor slab support structure 1 according to Embodiment 3, since the relationship between the plate width dimension a in the direction along the bridge axis direction X of the lower plate 14 and the upper plate 15 constituting the load transfer plate 10 and the predetermined interval b is set such that a > b, compared with the floor slab support structure 1 according to Embodiment 1, the contact area between the groove bottom surface 31a of the cut groove 31 and the lower plate 14, and the contact area between the groove upper surface 31b of the cut groove 31 and the upper plate 15 can be increased, and a floor slab support structure 1 that can support the separated floor slab 3 more stably can be constructed.

[0021] Embodiment 4 As shown in FIG. 7, in the floor slab support structure 1 according to Embodiment 4, after the floor slab 3 is cut by the above-mentioned predetermined length along the bridge axis direction X of the bridge 100, a plurality of load transfer plates 10, 10... are arranged at a predetermined interval b along the bridge axis direction X of the cut groove 31, and a filler 7 (not shown) is filled in the cut groove 31 between one load transfer plate 10 and the other load transfer plate 10 that are arranged adjacent to each other at a predetermined interval b along the bridge axis direction X of the cut groove 31. That is, a filler 7 (not shown) was filled in the cutting groove 31 in the region indicated by the interval b in FIG. 7.

[0022] According to the floor slab support structure 1 according to the fourth embodiment, for example, mortar (filler 7) filled in the cutting groove 31 between one load transfer plate 10 and the other load transfer plate 10 installed adjacent to each other at a predetermined interval b along the bridge axis direction X of the cutting groove 31 enters between the lower plate 14 of one load transfer plate 10 and the groove lower surface 31a of the cutting groove 31, and between the upper plate 15 of one load transfer plate 10 and the groove upper surface 31b of the cutting groove 31, and also enters between the lower plate 14 of the other load transfer plate 10 and the groove lower surface 31a of the cutting groove 31, and between the upper plate 15 of one load transfer plate 10 and the groove upper surface 31b of the cutting groove 31. Then, when the mortar (filler 7) hardens, the integrity between one load transfer plate 10 and the other load transfer plate 10, the integrity between the lower plate 14 of one load transfer plate 10 and the groove lower surface 31a of the cutting groove 31, the integrity between one load transfer plate 10 and the upper plate 15 and the groove upper surface 31b of the cutting groove 31, the integrity between the lower plate 14 of the other load transfer plate 10 and the groove lower surface 31a of the cutting groove 31, and the integrity between the other load transfer plate 10 and the upper plate 15 and the groove upper surface 31b of the cutting groove 31 are improved. Therefore, according to the floor slab support structure 1 according to the fourth embodiment, the same effect as that of the floor slab support structure 1 according to the first embodiment can be obtained. Also, in the same manner as the floor slab support structure 1 according to the second embodiment, it becomes possible to construct a floor slab support structure 1 that can stably support the separated floor slab 3 over a long period of time, and it becomes possible to provide a floor slab support structure 1 suitable for a case where the period during which the separated floor slab 3 is used as a road extends over a long period of time.

[0023] In addition, in the third and fourth embodiments, for example, steel plates were used as the load transfer plates 10 (lower plate 14, upper plate 15). For example, when the groove vertical width dimension between the upper and lower parts of the cutting groove 31 is 10 mm and the lateral width length W of the cutting groove 31 is 420 mm, the plate width dimension a in the direction along the bridge axis direction X of the load transfer plate 10 is 400 mm, the predetermined interval b between one load transfer plate 10 and the other load transfer plate 10 is 100 mm, and a steel plate with a plate thickness dimension of 6 mm was used for the lower plate 14. In practice, the surface accuracy (cutting accuracy) of the lower surface of the cutting groove 31 (the lower cutting surface of the cutting groove 31) 31a and the upper surface of the cutting groove 31 (the upper cutting surface of the cutting groove 31) 31b is not constant, and the gap between the lower plate 14 and the upper surface 31b of the cutting groove 31 is also not constant. Therefore, as the upper plate 15, a plate with a plate thickness dimension corresponding to the gap between the lower plate 14 and the upper surface 31b of the cutting groove 31 is used, or a plurality of upper plates 15 are inserted so as to overlap vertically in the gap according to the gap between the lower plate 14 and the upper surface 31b of the cutting groove 31.

[0024] Embodiment 5 In the floor slab support structure 1 according to Embodiments 1 and 2, a steel plate was used as the upper plate 12, and in the floor slab support structure 1 according to Embodiments 3 and 4, a steel plate was used as the upper plate 15. However, the floor slab support structure 1 according to Embodiment 5 is a floor slab support structure 1 configured to use a wooden plate as the upper plate 12 or the upper plate 15.

[0025] According to the floor slab support structure 1 according to Embodiment 5, the upper plate 12 or the upper plate 15 and the upper surface 31b of the cutting groove 31 are more likely to conform to each other, and the integrality between the load transfer plate 10 and the cutting groove 31 is improved. Therefore, it becomes possible to construct a floor slab support structure 1 that can support the separated floor slab 3 more stably.

[0026] Embodiment 6 As shown in FIG. 8, the floor slab support structure 1 according to Embodiment 6 is a floor slab support structure composed of an end-side load transfer plate 10A installed in the cutting groove 31 so that the load transfer plate 10 is inserted from the above-described cutting groove one-end-side opening 31L and reaches the vicinity of the central position in the cutting groove width direction, and the other-end-side load transfer plate 10B installed in the cutting groove 31 so that it is inserted from the above-described cutting groove other-end-side opening 31R and reaches the vicinity of the central position in the cutting groove width direction.

[0027] Incidentally, the end-side load transfer plate 10A and the other-end-side load transfer plate 10B are composed of a plurality of plates stacked vertically, for example, a lower plate 16, a middle plate 17, and an upper plate 18. Further, for the lower plate 16, the upper plate 18, and the middle plate 17, for example, it is preferable to use all wooden plates, or to use wooden plates for the lower plate 16 and the upper plate 18 and a steel plate for the middle plate 17. Also, as shown in FIG. 8(b), as the middle plate 17, for example, it is preferable to use a plate (a plate formed such that the plate thickness becomes thinner toward the tip 17a side of the insertion side) in which at least the tip 17a side of the insertion side is formed in a tapered shape.

[0028] The construction method of the floor slab support structure 1 according to Embodiment 6 is a method including a one-end-side load transfer plate installation step and a the-other-end-side load transfer plate installation step. In the one-end-side load transfer plate installation step, first, the lower plate 16 is inserted into the cutting groove 31 from the one-end-side opening 31L of the cutting groove, and the lower plate 16 is installed so that the tip side of the insertion side reaches near the central position in the width direction of the cutting groove. Next, the upper plate 18 is inserted between the lower plate 16 and the groove upper surface 31b of the cutting groove 31 from the one-end-side opening 31L of the cutting groove, and the upper plate 18 is installed so that the tip side of the insertion side reaches near the central position in the width direction of the cutting groove. Finally, the middle plate 17 is inserted between the lower plate 16 and the upper plate 18 from the one-end-side opening 31L of the cutting groove, and the middle plate 17 is installed so that the tip 17a side of the insertion side reaches near the central position in the width direction of the cutting groove. Thus, the one-end-side load transfer plate 10A is installed in the cutting groove 31. In the the-other-end-side load transfer plate installation step, from the other-end-side opening 31R of the cutting groove, in the same order as the one-end-side load transfer plate installation step, the lower plate 16, the upper plate 18, and the middle plate 17 are installed so that the tip side of the insertion side reaches near the central position in the width direction of the cutting groove, whereby the the-other-end-side load transfer plate 10B is installed in the cutting groove 31.

[0029] In the floor slab support structure 1 according to Embodiment 6, the one-end-side load transfer plate 10A and the the-other-end-side load transfer plate 10B are installed in the cutting groove 31 so as to be arranged on a straight line orthogonal to the bridge axis direction X. Further, in the floor slab support structure 1 according to Embodiment 6, the insertion length of the one - end - side load - transfer plate 10A and the other - end - side load - transfer plate 10B into the cutting groove 31 is preferably, for example, at least about 1 / 4 or more of the lateral width W in the direction along the bridge - axis perpendicular direction Y of the cutting groove 31.

[0030] And the floor slab support structure 1 according to Embodiment 6 uses the load - transfer plate 10 composed of the one - end - side load - transfer plate 10A and the other - end - side load - transfer plate 10B. Similar to the floor slab support structure 1 according to Embodiments 1 and 3, after the floor slab 3 is cut by the above - mentioned predetermined length along the bridge - axis direction X, one or more load - transfer plates 10 are inserted into the cutting groove 31 generated by the cutting and installed. For example, as shown in FIG. 9, a plurality of load - transfer plates 10, 10... are arranged at a predetermined interval b along the bridge - axis direction X of the cutting groove 31. That is, in the floor slab support structure 1 according to Embodiment 6, after the floor slab 3 is cut by a predetermined length along the bridge - axis direction X of the bridge 100, the load of the separated floor slab 3 and the load of the vehicle traveling on the separated floor slab 3 are transmitted to the girder 2 through one or more load - transfer plates 10.

[0031] According to the floor slab support structure 1 according to Embodiment 6, the same effects as those of the floor slab support structure 1 according to Embodiments 1 and 3 can be obtained. Further, according to the floor slab support structure 1 according to Embodiment 6, at least as the lower plate 16 and the upper plate 18, wooden plates are used. Thus, the lower plate 16 and the groove bottom surface 31a of the cutting groove 31 are easily adaptable, and the upper plate 18 and the groove upper surface 31b of the cutting groove 31 are easily adaptable. The integrity of the load - transfer plate 10 and the cutting groove 31 is improved, so that a floor slab support structure 1 that can support the separated floor slab 3 more stably can be constructed.

[0032] Embodiment 7 The floor slab support structure 1 according to Embodiment 7 uses the load transfer plate 10 composed of the one-end-side load transfer plate 10A and the other-end-side load transfer plate 10B described in Embodiment 6. Similar to the floor slab support structure 1 according to Embodiment 2, after the floor slab 3 is cut by the above-described predetermined length along the bridge axis direction X of the bridge 100, as shown in FIG. 9, a plurality of load transfer plates 10, 10... are installed in the cutting groove 31 at a predetermined interval along the bridge axis direction X of the cutting groove 31, and in the cutting groove 31 between one load transfer plate 10 and the other load transfer plate 10 installed adjacent to each other with a predetermined interval b along the bridge axis direction X of the cutting groove 31, for example, mortar as the filling material 7 is injected. Then, the plate material 13 described above is installed in the cutting groove 31 in which the filling material 7 between one load transfer plate 10 and the other load transfer plate 10 is injected.

[0033] According to the floor slab support structure 1 according to Embodiment 7, the same effect as the floor slab support structure 1 according to Embodiment 2 can be obtained. According to the floor slab support structure 1 according to Embodiment 7, the load transfer plate 10 composed of the one-end-side load transfer plate 10A and the other-end-side load transfer plate 10B described in Embodiment 6 is used. Since the integrity between the load transfer plate 10 and the cutting groove 31 is improved, a floor slab support structure 1 that can support the separated floor slab 3 more stably can be constructed.

[0034] In addition, in Embodiments 6 and 7, for example, when the vertical width dimension between the upper and lower parts of the cutting groove 31 is 10 mm and the lateral width length W of the cutting groove 31 is 420 mm, the plate width dimension a in the direction along the bridge axis direction X of the load transfer plate 10 is 100 mm, the predetermined interval b between one load transfer plate 10 and the other load transfer plate 10 is 400 mm, the plate width dimension in the direction along the bridge axis direction X of the plate material 13 is slightly smaller than 400 mm, which is the dimension of the predetermined interval b, and the lower plate 16 and the upper plate 18 use steel plates with a plate thickness dimension of 3 mm. Also, the plate material 13 uses a steel plate with a plate thickness dimension of 6 mm. In practice, the surface accuracy (cutting accuracy) of the lower surface of the cutting groove 31 (the lower cutting surface of the cutting groove 31) 31a and the upper surface of the cutting groove 31 (the upper cutting surface of the cutting groove 31) 31b is not constant, and the gap between the lower plate 14 and the upper surface 31b of the cutting groove 31 is also not constant. Therefore, as the middle plate 12, it is preferable to use a plate having a thickness dimension that can be fitted between the lower plate 16 and the upper plate 18.

[0035] In each of the embodiments, the floor slab support structure 1 using the load transfer plate 10 composed of a plurality of plates stacked vertically is illustrated. However, the floor slab support structure according to the present invention is a floor slab support structure configured to transmit the vertical load of the cut floor slab to the girder through a single (one) load transfer plate fitted into the cutting groove generated by cutting the floor slab. For example, it may be a floor slab support structure in which a single flat plate is fitted as a load transfer plate (load transfer means) so as to penetrate the cutting groove along the direction perpendicular to the bridge axis. Further, one end side load transfer plate installed so as to be inserted from the cutting groove one end side opening located on one end side in the direction perpendicular to the bridge axis of the cutting groove and reach near the central position in the cutting groove width direction is composed of a single flat plate, and the other end side load transfer plate installed so as to be inserted from the cutting groove other end side opening located on the other end side in the direction perpendicular to the bridge axis of the cutting groove and reach near the central position in the cutting groove width direction is composed of a single flat plate. It may be a floor slab support structure.

[0036] In each of the embodiments, after the floor slab 3 is cut by a predetermined length along the bridge axis direction X, the floor slab support structure 1 in which a plurality of load transfer plates 10, 10... are installed at a predetermined interval b along the bridge axis direction X of the cutting groove 31 is illustrated. However, the floor slab support structure according to the present invention is a floor slab support structure in which, after the floor slab 3 is cut by a predetermined length along the bridge axis direction X, one load transfer plate 10 is installed at any one position in the direction along the bridge axis direction X of the cutting groove 31. Alternatively, the floor slab support structure according to the present invention may be a floor slab support structure configured by installing a set of one - end - side load - transfer plates 10A and the other - end - side load - transfer plates 10B at any one location in the direction along the bridge axis direction X of the cutting groove 31 after the floor slab 3 is cut by a predetermined length along the bridge axis direction X.

Explanation of Reference Numerals

[0037] 1 Floor slab support structure 2 Girder 3 Floor slab, separated floor slab 7 Filling material 10 Load - transfer plate (load - transfer means) 10A One - end - side load - transfer plate 10B Other - end - side load - transfer plate 13 Plate material 16 Lower plate 17 Middle plate 18 Upper plate 31 Cutting groove 31L One - end - side opening of the cutting groove 31R Other - end - side opening of the cutting groove 100 Bridge b Predetermined interval X Bridge axis direction of the bridge Y Direction perpendicular to the bridge axis of the bridge

Claims

1. A floor slab support structure configured to transmit the load of the floor slab cut along the horizontal direction and separated from the girder and the load of the vehicle traveling on the floor slab separated from the girder to the girder, configured to transmit the load of the cut floor slab and the load of the vehicle traveling on the floor slab separated from the girder to the girder through load transmission means installed in the cut groove generated by the cutting of the floor slab, The load transmission means is composed of a load transmission plate fitted into the cut groove, and is characterized by the floor slab support structure.

2. The floor slab support structure according to claim 1, wherein the load transmission plate is composed of a plurality of plates stacked one on top of the other.

3. The floor slab support structure according to claim 2, wherein the plate is a flat plate.

4. The floor slab support structure according to claim 2, wherein the load transmission plate is installed so as to penetrate the cut groove along the direction perpendicular to the bridge axis.

5. The load transmission plate is a load transmission plate on one end side installed to be inserted from an opening on one end side of the cut groove located on one end side in the direction perpendicular to the bridge axis of the cut groove and reach near the central position in the width direction of the cut groove, a load transmission plate on the other end side installed to be inserted from an opening on the other end side of the cut groove located on the other end side in the direction perpendicular to the bridge axis of the cut groove and reach near the central position in the width direction of the cut groove, and is characterized by the floor slab support structure according to claim 2.

6. The load transmission plate on one end side and the load transmission plate on the other end side each have a lower plate installed to reach near the central position in the width direction of the cut groove in the cut groove, and an upper plate installed to reach near the central position in the width direction of the cut groove in the cut groove, The floor slab support structure according to claim 5, further comprising a middle plate inserted between a lower plate and an upper plate installed in a cutting groove and installed so as to reach a position near the center in the cutting groove width direction within the cutting groove.

7. The floor slab support structure according to any one of claims 1 to 6, further comprising a plurality of load transfer plates, wherein the plurality of load transfer plates are installed at predetermined intervals along the bridge axis direction of the cutting groove.

8. The floor slab support structure according to claim 7, further comprising a filler injected into a cutting groove between one load transfer plate and another load transfer plate installed adjacent to each other at a predetermined interval along the bridge axis direction of the cutting groove.

9. The floor slab support structure according to claim 8, further comprising a plate material installed in a cutting groove into which a filler between one load transfer plate and another load transfer plate installed adjacent to each other at a predetermined interval along the bridge axis direction of the cutting groove is injected.

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