JP6905709B2 - Deck renewal method, deck joint structure and road bridge - Google Patents

Description

The present invention relates to a deck renewal method, a deck joint structure and a road bridge.

As a floor slab renewal work, after removing the old floor slab from the steel girder, a new floor slab may be installed on the steel girder. In the deck renewal work for a road bridge with two or more lanes, if the road is divided into two in the width direction and one of the divided roads is in service and the other deck is renewed, the road will not be blocked. Construction can be done.
In the floor slab renewal work, it is common to join the floor slabs together. For example, Patent Document 1 discloses a structure in which precast decks adjacent to each other in the road width direction are integrated with a PC tensioning material on the upper surface of a steel girder. Further, in Patent Document 2, at the joint between precast decks, concrete is cast so as to involve the reinforcing bars protruding from the abutting surface of each precast deck, thereby rigidly connecting the precast decks to each other. The joint structure is disclosed.

Japanese Unexamined Patent Publication No. 2016-98489 Japanese Unexamined Patent Publication No. 2001-49621

When prestress is introduced at the joint between precast decks as in the deck renewal work of Patent Document 1, the precast deck previously constructed is joined to the steel girder and then followed. Precast deck will be constructed. However, since the construction of the trailing precast deck is carried out with the preceding precast deck in service, vibrations caused by the running of the traffic vehicle are transmitted to the steel girder and affect the trailing precast deck. May affect.
Further, when the joint portion between the precast floor slabs has a reinforced concrete structure as in the floor slab renewal work of Patent Document 2, the width of the joint portion is increased in order to secure the joint length of the reinforcing bar (for example, 300). ~ 400 mm). Therefore, it may not be possible to secure the width required to operate the road by one-sided traffic. Further, if vibration or the like caused by traveling of a traffic vehicle is transmitted from the precast deck in service to the cast concrete or the like at the joint, there is a possibility that the hardening of the concrete is hindered.
From this point of view, the present invention is a floor slab renewal method that makes it possible to minimize the influence of traveling of a traffic vehicle when the floor slab renewal work is alternately carried out on each side while the road is in service. It is an object of the present invention to propose a deck joint structure and a road bridge provided with this deck joint structure.

The deck renewal method of the present invention for solving the above-mentioned problems is divided into one side and the other side with a steel girder as a boundary in the road width direction, and the other side is in service with the one side in service. It includes a pre-construction step for updating the deck and a post-construction step for updating the deck on the other side while the other side is in service. The pre-construction process includes a first removal work for removing the existing deck on the other side, a first widening work for fixing the widening steel material overhanging the other side of the steel girder to the steel girder, and the steel girder. It is provided with the first laying work of laying the preceding new floor slab with the end of the preceding new floor slab placed on it, and the post-construction process removes the existing floor slab on one side. The removal work, the second widening work of fixing the widened steel material overhanging to one side of the steel girder to the steel girder, and the trailing with the end of the trailing new deck placed on the steel girder. It includes a second laying operation for laying a new floor slab and a filling work for filling a filling material between the separated preceding new floor slab and the succeeding new floor slab.
According to this method of updating the floor slab, since the new floor slabs are updated without being rigidly coupled (integrated), the influence of vibration of the traffic vehicle traveling on the preceding new floor slab during the construction of the subsequent new floor slab is affected. Can be minimized. Further, since the width of the joint between the floor slabs can be minimized, the floor slab can be renewed on a road bridge having two or more lanes without completely stopping the traffic.

Further, the deck joining structure of the present invention includes a steel girder, a pair of decks whose ends are placed on the upper surface of the steel girder, and a padding filled between the end faces of the pair of decks. It is a floor slab joint structure including a material, and the floor slabs are continuous with each other through the padding material without being rigidly bonded to each other, and are attached to the steel girder and the lower surface of the floor slab. The widened steel material is fixed, and a sealing material is interposed between the deck and the steel girder or between the deck and the widened steel material at the edge of the deck and the edge of the widened steel. has been set is characterized in Rukoto.
Further, the road bridge of the present invention is characterized by having the floor slab joint structure.
According to such a deck joint structure and a road bridge, since there is no steel material for rigidly bonding the decks to each other, moisture permeates from the joint between the decks (the boundary between the padding material and the deck). Even in this case, damage due to deterioration of the steel material does not occur. In addition, in the floor slab renewal work, even when the other floor slab is constructed while one floor slab is in service, the influence of the traffic vehicle on the floor slab laid in advance is minimized. Can be suppressed to.

Incidentally, because widening steel which is additionally provided on the lower surface of the floor slab has been fixed to the steel girder, when the steel girder flanges does not have a wide enough for placing the ends of the slab Even so, the floor slab can be placed. It is desirable that a joining member such as a gibber or a stud bolt to be inserted into the floor slab is erected on the upper surface of the widened steel material. The joining member functions as a slip stopper for the floor slab. Further, at the edge of the edge and the wider steel of the deck, because the sealing material is interposed between or between the floor slab and widening steel and the steel girder and the floor plate, while filling It is possible to prevent the outflow of the material and fill it densely, and it is possible to minimize the permeation of water into the joint.
Further, it is desirable that a shear key is formed on the end face of the deck in order to prevent a step from being generated between the decks. Further, if a connecting member connecting the steel girder and the filling material is inserted into the filling material in addition to the shear key, it is possible to prevent a step from being generated in the floor slab and the floor slab is lifted. Can be prevented.

According to the floor slab renewal method, the floor slab joint structure, and the road bridge of the present invention, it is possible to minimize the influence of traveling of a traffic vehicle when the floor slab renewal work is alternately performed on each side while the road is in service. It will be possible.

It is a cross-sectional view of the bridge which renews the floor slab by the floor slab renewal method of embodiment of this invention. It is sectional drawing which shows the floor slab joint structure which concerns on 1st Embodiment. It is a cross-sectional view which shows each work situation of the pre-construction process of the floor slab renewal method, (a) is a first removal work, (b) is a first widening work, (c) is a first laying work. It is a cross-sectional view which shows each work situation of the post-construction process of a floor slab renewal method, (a) is a 2nd removal work, (b) is a 2nd widening work, and (c) is a 2nd laying work. (A) is a cross-sectional view showing the floor slab joint structure according to the second embodiment, and (b) is a cross-sectional view showing another form. (A) is a cross-sectional view showing a floor slab joint structure according to a third embodiment, and (b) is a cross-sectional view showing another form. It is sectional drawing which shows the floor slab joint structure which concerns on 4th Embodiment.

<First Embodiment>
In the embodiment of the present invention, as the floor slab renewal work of the bridge (road bridge) for the two-lane road shown in FIG. 1, after removing the deteriorated existing floor slab (existing floor slab 2) from the steel girder 3. The deck renewal method adopted when the new deck (new deck 4) is installed on the steel girder 3 and the deck joining structure 1 (see FIG. 2) of the new deck 4 will be described. The existing deck 2 is arranged in a direction intersecting the bridge axis direction with three main girders 31 arranged along the bridge axis direction and auxiliary girders 32 arranged between the main girders 31. It is supported by the cross girder 33. As shown in FIG. 2, the main girder 31 is made of I-shaped steel having upper and lower flanges 34 and 34 and a web 35 connecting the flanges 34 to each other. The configuration of the main girder 31 is not limited, and may be, for example, channel steel or H-shaped steel.

As shown in FIG. 1, the deck renewal method of the present embodiment is on one side (left side in FIG. 1) and the other side (right side in FIG. 1) with the central main girder 31 as a boundary with respect to the road width direction. In the pre-construction process of dividing and updating the floor slab in the pre-construction range A1 on the other side while the post-construction range A2 on one side is in service, and in the post-construction range A2 in the state where the pre-construction range A1 is in service. It has a post-construction process to update the deck.

In the pre-construction process, as shown in FIG. 3A, first, the split existing floor slab 21 on the other side is removed (first removal work). In the present embodiment, the existing floor slab 2 is cut immediately above the girder shaft of the main girder 31, and the split existing floor slab 21 on the other side is removed while the split existing floor slab 22 on one side is in service. At this time, if the main girder 31 and the divided existing floor slab 21 are joined by an existing joining member 36 such as a gibber, the existing joining member 36 is removed (cut) from the main girder 31.

Next, as shown in FIG. 3B, the widening steel material 5 attached to the lower surface of the new floor slab 4 (preceding new floor slab 41) is fixed to the upper flange 34 of the main girder 31 (first widening work). ). The widened steel material 5 is projected from the outer edge of the upper flange 34. The widened steel material 5 is fixed so as to project to the other side by bolting in a state where it is placed on the upper surface of the other side of the upper flange 34 exposed by removing the divided existing floor slab 21. The method of fixing the widened steel material 5 is not limited to bolt joining, and may be welded to the upper flange 34, for example. In the present embodiment, the widened steel material 5 is arranged at a position shifted to the other side from the center line of the main girder 31. The widened steel material 5 may be arranged so that the end face coincides with the center of the main girder 31. Joining members 6 are erected on the upper surface of the widened steel material 5 at regular intervals along the girder axis direction of the main girder 31. Here, the widening steel material 5 may be provided only in the vicinity where the joint member 6 is erected, or may be continuous with respect to the bridge axis direction. Further, the standing position of the joining member 6 is not limited to symmetrical with respect to the steel girder 3, and may be displaced with respect to the bridge axis direction. That is, the joining members 6 may be arranged in a staggered pattern. The joining member 6 is made of, for example, a plurality of stud bolts or perforated steel plate gibber arranged side by side along the bridge axis direction.

After fixing the widened steel material 5 to the upper flange 34 of the main girder 31, the preceding new floor slab 41 is laid (first laying work) as shown in FIG. 3 (c). The end portion of the preceding new floor slab 41 is placed on the upper flange 34 of the main girder 31 via the widened steel material 5. At this time, a gap is formed between the end face of the preceding new floor slab 41 and the end face of the split existing floor slab 22 on one side. A through hole 43 is formed at the end of the preceding new floor slab 41 corresponding to the position of the joining member 6. When laying the preceding new floor slab 41, the joining member 6 is inserted into the through hole 43. A gap for accommodating the bolt 51 for fixing the widening steel material 5 is formed between the preceding new floor slab 41 and the widening steel material 5. Therefore, when the preceding new floor slab 41 is placed, the filling material 7 is injected from the through hole 43 to fill the gap between the preceding new floor slab 41 and the widened steel material 5 and the through hole 43. The sealing material 8 is installed on the upper surface of the widened steel material 5 along the left and right edges (the edges on one side and the other side). That is, at the edge of the new floor slab 41 and the edge of the widening steel material 5, the sealing material 8 is interposed between the new floor slab 41 and the widening steel material 5, so that the filling material 7 is washed away. Is prevented. As the material constituting the filling material 7, it is desirable that the material can be filled in a narrow space and has good adhesion performance with the preceding new floor slab 41 (concrete floor slab). As such a material, for example, non-shrink mortar may be used. When a non-shrink mortar is used as the packing material 7, it is desirable to mix steel fibers or organic fibers for the purpose of suppressing damage due to impact or the like. After curing the padding material 7, pavement (not shown) is performed on the preceding new floor slab 41.

In the post-construction process, after the construction of the preceding new floor slab 41, the construction is performed with the preceding new floor slab 41 in service. First, as shown in FIG. 4A, the split existing floor slab 22 on one side is removed (second removal work). At this time, when the main girder 31 and the divided existing floor slab 22 are joined by the existing joining member 36 such as a gibber, the existing joining member 36 is removed (cut) from the main girder 31.
Next, as shown in FIG. 4B, the widening steel material 5 attached to the lower surface of the new floor slab 4 (following new floor slab 42) is fixed to the upper flange 34 of the main girder 31 (second widening). work). The widened steel material 5 is a steel plate having a width equal to or larger than the width of the upper flange 34. The widened steel material 5 is fixed so as to project to one side by bolting while being placed on the upper surface of one side of the upper flange 34 exposed by removing the existing divided floor slab 22. Joining members 6 are erected on the upper surface of the widened steel material 5 at regular intervals along the girder axis direction of the main girder 31.

After fixing the widened steel material 5 to the upper flange 34 of the main girder 31, the trailing new floor slab 42 is laid (second laying work) as shown in FIG. 4 (c). The end portion of the trailing new floor slab 42 is placed on the upper flange 34 of the main girder 31 via the widened steel material 5. At this time, a gap is formed between the end face of the leading new floor slab 41 and the end face of the trailing new floor slab 42. A through hole 43 is formed at the end of the trailing new floor slab 42, corresponding to the position of the joining member 6. When laying the trailing new floor slab 42, the joining member 6 is inserted into the through hole 43. A gap is formed between the trailing new floor slab 42 and the widening steel material 5 to accommodate the bolt 51 for fixing the widening steel material 5. Therefore, when the trailing new floor slab 42 is placed, the filling material 7 is injected from the through hole 43 to fill the gap between the trailing new floor slab 42 and the widened steel material 5 and the through hole 43. The sealing material 8 is installed on the upper surface of the widened steel material 5 along the left and right edges (the edges on one side and the other side). That is, at the edge of the trailing new floor slab 42 and the edge of the widening steel material 5, the sealing material 8 is interposed between the trailing new floor slab 42 and the widening steel material 5, so that the filling material 7 is provided. Is prevented from being washed away.
After laying the trailing new floor slab 42, as shown in FIG. 2, the gap between the preceding new floor slab 41 and the trailing new floor slab 42 is filled with the filling material 7 (filling work). After curing the padding material 7, pavement (not shown) is performed on the trailing new floor slab 42 (including the padding material 7) to complete the road bridge. In the present embodiment, the filling material 7 made of the same material as the filling material 7 to be injected into each through hole 43 is filled in the gap between the preceding new floor slab 41 and the succeeding new floor slab 42. Different materials may be used for the filling material 7 to be filled.

As described above, according to the floor slab renewal method of the present embodiment, the main girder 31 (steel girder 3) and a pair of new floor slabs 4 and 4 (preceding new floor slab 41 and 4) whose ends are placed on the upper surface of the main girder 31. A floor slab joint structure 1 having a trailing new floor slab 42) and a padding material 7 filled between the end faces of the pair of new floor slabs 4 and 4, and a road bridge having the floor slab joint structure 1 It is formed. Since the preceding new floor slab 41 and the succeeding new floor slab 42 are continuous via the padding material 7 without being rigidly coupled, the preceding new floor slab 41 is placed on the preceding new floor slab 41 when the succeeding new floor slab 42 is constructed. The influence of vibration of the traveling traffic vehicle can be minimized. In addition, since the width of the joint between the preceding new floor slab 41 and the succeeding new floor slab 42 can be minimized, traffic is completely stopped for the floor slab renewal work of road bridges with two or more lanes. The possibility that it can be carried out without any increase increases.

Further, since the widening steel material 5 attached to the lower surface of the new floor slab 4 is fixed to the main girder 31, the width is secured for mounting the end portion of the new floor slab 4.
Further, since the joining member 6 to be inserted into the new floor slab 4 is erected on the upper surface of the widened steel material 5, the displacement of the new floor slab 4 is suppressed.
Further, since the sealing material 8 is interposed between the new floor slab 4 and the widening steel material 5 at the edge of the new floor slab 4 and the edge of the widening steel material 5, the filling material 7 does not flow out. , Can be reliably filled.

<Second embodiment>
As shown in FIG. 5A, the floor slab joint structure 1 according to the second embodiment uses a flat plate as the widening steel material 5 in that a steel material having an L-shaped cross section is used as the widening steel material 5. It is different from one embodiment. The widened steel material 5 of the second embodiment includes a fixed piece 52 fixed to the side surface of the web 35 of the main girder 31 and an upper piece 53 extending in a direction intersecting the fixed piece 52 (web 35). In the present embodiment, a pair of widening steel members 5 are arranged so as to face each other with the web 35 sandwiched between them, and the fixing pieces 52 of both widening steel members 5 are fixed to each other by bolts 51 penetrating the web 35. Further, in the present embodiment, the upper piece 53 is fixed to the upper flange 34 by a bolt 51 penetrating the upper flange 34 of the main girder 31. The number and arrangement of the bolts 51 used to fix the widened steel material 5 are not limited, and for example, the widened steel material 5 may be fixed only to the web 35. A joining member 6 (for example, a stud bolt, a perforated steel plate gibber, etc.) is erected on the upper surface of the widened steel material 5. Here, the widening steel material 5 may be provided only in the vicinity where the joint member 6 is erected, or may be continuous with respect to the bridge axis direction. Further, the standing position of the joining member 6 is not limited to symmetrical with respect to the steel girder, and may be displaced with respect to the bridge axis direction (the joining member 6 may be arranged in a staggered pattern). When the joining members 6 are arranged in a staggered pattern, the widened steel member 5 may also be arranged in a staggered pattern.
According to the floor slab joint structure 1 of the present embodiment, the same action and effect as the floor slab joint structure 1 of the first embodiment can be obtained.

In the deck joining structure 1, as shown in FIG. 5B, the widened steel material 5 on the flat plate arranged on the upper surface of the upper flange 34 and the corners of the upper flange 34 and the web 35 are arranged. It may be combined with the widening steel material 5 having an L-shaped cross section. At this time, both widened steel members 5 are arranged with the upper flange 34 sandwiched between them, and the upper flange 34 is fixed by a bolt 51 penetrating the upper flange 34. Further, a steel plate 54 having the same thickness as that of the upper flange 34 is interposed in the portion protruding from the upper flange 34 of both widened steel materials 5.

<Third Embodiment>
As shown in FIG. 6A, the floor slab joint structure 1 of the third embodiment is different from the first embodiment in that a recess 44 is formed on the end surface (end surface) of the new floor slab 4. There is. The details of the steel girder 3, the widened steel material 5, the joining member 6, the filling material 7, and the like of the floor slab joining structure 1 of the third embodiment are the same as those shown in the first embodiment. Is omitted.
A trapezoidal recess 44 is formed on the end surface of the new floor slab 4 of the present embodiment. When the filling material 7 filled in the gap between the new floor slabs 4 solidifies in the state of being inserted into the recesses 44, the recesses 44 function as shear keys, so that a step is generated between the new floor slabs 4. Can be prevented. The shape of the recess 44 is not limited, and may be arcuate, for example, as shown in FIG. 6B. Further, a convex portion (projection) or a step may be formed on the end surface of the new floor slab 4 instead of the concave portion 44. Further, the recess 44 may be formed as needed and may be omitted.
Further, a water blocking material 9 is installed on the upper part of the end surface of the new floor slab 4 of the present embodiment. Since the water blocking material 9 prevents moisture from penetrating from the boundary between the filling material 7 and the new floor slab 4, the durability of the bridge is improved. The material constituting the water blocking material 9 is not limited, but for example, butyl rubber or water-swelling rubber may be used. The location where the water blocking material 9 is installed is not limited. Further, the water blocking material 9 may be installed as needed.

<Fourth Embodiment>
The floor slab joining structure 1 according to the fourth embodiment is the first embodiment in that, as shown in FIG. 7, a connecting member 61 erected on the upper surface of the main girder 31 is embedded in the packing material 7. Is different. In addition, since the details of the steel girder 3, the widened steel material 5, the joining member 6, etc. of the deck joining structure 1 of the fourth embodiment are the same as those shown in the first embodiment, detailed description thereof will be omitted. ..
The end face of the new floor slab 4 of the present embodiment is inclined so as to be separated from the other new floor slab 4 as it goes upward. Therefore, a V-shaped gap is formed between the new floor slabs 4. The filling material 7 filled in the gap between the main girder 31 and the V-shape is ensured to be integral with the connecting member 61. Therefore, since the filling material 7 functions as a wedge, it is possible to more reliably prevent the new floor slabs 4 from being displaced from each other and the new floor slabs 4 from being lifted. The shape of the end surface of the new floor slab 4 of the floor slab joint structure 1 of the present embodiment is not limited, and for example, a recess 44 may be formed (see FIG. 6). If a concave portion is formed in the floor slab, the concave portion 44 functions as a shear key, so that the shear key and the connecting member 61 can be integrated to more reliably prevent a step from being generated on the floor slab, and the newly installed floor slab 4 Can be prevented from rising.

Although the embodiments according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and each of the above-mentioned components can be appropriately modified without departing from the spirit of the present invention.
For example, the widening steel material 5 may be installed as needed or may be omitted.
The joining member 6 may be erected on the main girder 31.
In the floor slab joining structure 1, it is not always necessary to join the new floor slabs 4 to each other in the central portion in the road width direction, and the joint location between the new floor slabs 4 may be appropriately determined.
In each of the above embodiments, the case where a continuous new floor slab 4 is laid on the existing steel girder 3 has been described, but the new floor slab 4 is on the new steel girder 3 (for example, the new auxiliary girder 32, etc.). It may be laid continuously with.

1 Floor slab joint structure 2 Existing floor slab 21 and 22 Divided existing floor slab 3 Steel girder 31 Main girder 32 Auxiliary girder 34 Flange 35 Web 36 Existing joint member 4 New floor slab 41 Advance new floor slab 42 Subsequent new floor slab 43 Hole 5 Widening steel 6 Joining member 61 Connecting member 7 Stuffing material 8 Sealing material 9 Water blocking material

Claims (6)

Divide into one side and the other side with the steel girder as the boundary in the road width direction,
In the pre-construction process of updating the floor slab on the other side while the one side is in service,
A floor slab renewal method comprising a post-construction step of renewing a deck slab on the other side while the other side is in service.
The pre-construction process is
The first removal work to remove the existing floor slab on the other side,
The first widening work of fixing the widening steel material overhanging the other side of the steel girder to the steel girder,
It is provided with the first laying work of laying the preceding new floor slab with the end of the preceding new floor slab placed on the steel girder.
The post-construction process is
The second removal work to remove the existing floor slab on one side,
The second widening work of fixing the widening steel material overhanging to one side of the steel girder to the steel girder,
The second laying work of laying the trailing new deck with the end of the trailing new deck placed on the steel girder,
A method for renewing a floor slab, which comprises a padding operation of filling a padding material between the separated preceding new floor slab and the trailing new floor slab. With steel girders
A pair of decks whose ends are placed on the upper surface of the steel girder,
A deck joint structure including a padding material filled between the end faces of the pair of decks.
The floor slabs are continuous with each other through the padding material without being rigidly bonded to each other.
A widening steel material attached to the lower surface of the deck is fixed to the steel girder.
At the edge of the deck and the edge of the widened steel material, a sealing material is interposed between the deck and the steel girder or between the deck and the widened steel material. Deck joint structure. A joining member is erected on the upper surface of the widened steel material.
The floor slab joining structure according to claim 2 , wherein the joining member is inserted into the floor slab. The deck joining structure according to claim 2 or 3 , wherein a shear key is formed on the end face of the deck. The floor slab joining structure according to any one of claims 2 to 4 , wherein a connecting member for connecting the steel girder and the packing material is inserted into the filling material. .. A road bridge comprising the floor slab joint structure according to any one of claims 2 to 5.

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