Slab replacing method

Abstract

To provide a slab replacing method, which is efficient and with which traffic lanes can be kept open safely during construction.SOLUTION: In a slab replacing method, a pre-construction process A is carried out in a first section of an overtaking lane 2, and the next day onwards, a main construction process B is carried out in the first section of the overtaking lane 2, and meanwhile, the pre-construction process A is carried out in a second section of the overtaking lane 2, and the next day onwards, a post-construction process C is carried out in the first section of the overtaking lane 2, and meanwhile, the main construction process B is carried out in the second section of the overtaking lane 2, and the pre-construction process A is carried out in a third section of the overtaking lane 2. In the pre-construction process A, the underside of the existing slabs of the overtaking lane 2 is cut and separated from a main girder, and the existing slabs that have been cut are temporarily fixed to the main girder, and in the main construction process B, new slabs are erected in place of the existing slabs, and covering plates are placed on top of the new slabs.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a deck replacement method. [Background technology]

[0002] Conventionally, in bridge repair work on expressways and the like, the deteriorated deck is removed from the bridge girder and a new precast deck is erected, but it is necessary to close the road by restricting traffic during the construction period. Therefore, for example, according to the technology described in Patent Document 1 below (hereinafter referred to as the "Publication 1 Invention"), of adjacent lanes, only one lane is restricted during construction while the other lane is open, making it possible to carry out repair work without closing the entire road.

[0003] However, in the invention disclosed in the prior art, the number of available lanes is reduced by traffic restrictions, so unless the traffic volume itself is reduced, traffic congestion will occur. Therefore, there is a construction method in which construction involving traffic restrictions is carried out only at night when traffic volume is low, and all lanes are opened during the day when traffic volume is high. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6323776 Summary of the Invention [Problem to be solved by the invention]

[0005] According to the above-mentioned construction method, since the construction can only be done at night, the repair work is divided into several stages, and several stages are completed overnight, and the next stage is carried out the following night, repeating this cycle. In particular, since the lanes are opened during the day while the work is in progress, it is necessary to complete the stages in a state that can withstand vehicle traffic. Therefore, it is essential to complete the overnight process efficiently in the limited time and in a state where vehicles can safely pass through.

[0006] The present invention has been proposed in view of the above-mentioned circumstances, and has an object to provide a deck replacement method that is efficient and allows lanes to be opened safely during construction. [Means for solving the problem]

[0007] In order to achieve the above object, the deck replacement method of the present invention includes a first traffic control step of controlling traffic on one of a plurality of lanes to be replaced with an existing deck, a pre-construction step of cutting the underside of the existing deck of the lane to separate it from the main girder and temporarily fixing the existing deck to the main girder during a first traffic control period during which traffic is controlled after the first traffic control step, a first traffic control release step of lifting the traffic control after the pre-construction step, a second traffic control step of controlling traffic on the lane after the first traffic control release period during which traffic control is lifted after the first traffic control release step, and a second traffic control step of controlling traffic on the lane during a second traffic control period during which traffic is controlled after the second traffic control step. the main construction procedure includes a main construction procedure of erecting a new deck slab in place of the existing deck slab and installing a covering plate on the new deck slab; a second traffic regulation lifting procedure of lifting the traffic regulation after the main construction procedure; a third traffic regulation procedure of restricting traffic on the lane after a second traffic regulation lifting period during which traffic regulations are lifted after the second traffic regulation lifting procedure; a post-construction procedure of removing the covering plate and pouring filler concrete between the new deck slabs and installing the covering plate on the new deck slab again during a third traffic regulation period during which traffic is restricted after the third traffic regulation procedure; and a third traffic regulation lifting procedure of lifting the traffic regulation after the post-construction procedure.

[0008] The deck replacement method of the present invention is characterized in that the lane has a plurality of sections by being divided into predetermined ranges for each of the existing decks in the bridge axis direction, and the pre-construction procedure of the following section adjacent to the leading section is carried out within the second traffic control period of the leading section, and the main construction procedure of the following section is carried out within the third traffic control period of the leading section.

[0009] The deck replacement method of the present invention is characterized in that a covering plate removal procedure for removing the covering plate from the leading section where the filling concrete has completed curing is carried out within the first traffic control period, the second traffic control period, or the third traffic control period of any of the sections after the trailing section.

[0010] The deck replacement method according to the present invention is characterized in that, after the covering plate removal procedure, a waterproofing procedure is performed to waterproof the newly constructed deck, and a paving procedure is performed to pave the newly constructed deck.

[0011] The deck replacement method of the present invention is characterized in that, after the covering plate removal procedure for all of the sections, in the main construction procedure for the other lane adjacent to the replaced lane, which is the lane of the new deck, in a direction perpendicular to the bridge axis, a joining procedure is performed to join the new deck of the other lane and the new deck of the replaced lane with PC steel.

[0012] The deck replacement method of the present invention is characterized in that the pre-construction procedure includes a temporary fixing procedure in which the existing deck is temporarily fixed to the main girders via temporary fixing members that span between the main girders in a direction perpendicular to the bridge axis.

[0013] The deck replacement method of the present invention is characterized in that the temporary fixing step includes a hole drilling step of drilling holes in the existing deck in the thickness direction, a hanging bolt installation step of inserting hanging bolts into holes formed in the hole drilling step, a vertical restraint step of attaching the temporary fixing members to the hanging bolts in a state of being in close contact with the flange of the main girder below the existing deck, and a lateral restraint step of fastening the temporary fixing members to the flange.

[0014] The deck replacement method of the present invention is characterized in that the first traffic control period, the second traffic control period, and the third traffic control period are time periods in a day when traffic volume is low, and the first traffic control lift period and the second traffic control lift period are time periods in a day when traffic volume is high. Effect of the Invention

[0015] The deck replacement method of the present invention includes a first traffic control step of controlling traffic on one of multiple lanes to be replaced with an existing deck, a pre-construction step of cutting the underside of the existing deck of the lane to separate it from the main girders and temporarily fixing the existing deck to the main girders during a first traffic control period during which traffic is controlled after the first traffic control step, a first traffic control release step of lifting the traffic control after the pre-construction step, a second traffic control step of controlling traffic on the lane after the first traffic control release period during which traffic control is lifted after the first traffic control release step, and a second traffic control step of controlling traffic on the lane during the second traffic control period during which traffic is controlled after the second traffic control step. The method includes a main construction procedure in which a new deck slab is erected in place of the existing deck slab and a covering plate is installed on the new deck slab, a second traffic regulation release procedure in which traffic regulation is released after the main construction procedure, a third traffic regulation procedure in which traffic is regulated on the lane after the second traffic regulation release period during which traffic regulation is released after the second traffic regulation release procedure, a post-construction procedure in which the covering plate is removed and filler concrete is poured between the new deck slabs during the third traffic regulation period during which traffic is regulated after the third traffic regulation procedure, and a third traffic regulation release procedure in which traffic regulation is released after the post-construction procedure. That is, in the present invention, the construction is divided into a pre-construction procedure, a main construction procedure, and a post-construction procedure, so that each procedure is carried out during a time period with low traffic volume. In other words, during a time period with high traffic volume, traffic regulation is released as the first traffic regulation release period in the first traffic regulation release procedure, the second traffic regulation release period in the second traffic regulation release procedure, and the third traffic regulation release period in the third traffic regulation release procedure. Therefore, traffic congestion caused by construction work can be minimized as much as possible.

[0016] In the pre-construction procedure, the existing deck is separated from the main girder, so in the main construction procedure, when replacing the existing deck with a new deck, it is easy to remove the existing deck because it has already been cut. This makes it efficient. In addition, in the main construction procedure, a covering plate is installed on top of the new deck, and the covering plate acts as a pavement, so the lanes can be safely opened even during the construction period. In other words, the curing of mortar and concrete required for joining the new deck can be postponed to the post-construction procedure, and traffic restrictions can be lifted.

[0017] The deck replacement method of the present invention has multiple sections because the lanes are divided into predetermined ranges for each existing deck in the bridge axis direction, and the pre-construction procedure for the trailing section adjacent to the leading section is carried out during the second traffic control period of the leading section, and the main construction procedure for the trailing section is carried out during the third traffic control period of the leading section. In other words, while the pre-construction procedure, main construction procedure, and post-construction procedure are carried out for each section as one cycle, the leading section and the trailing section undergo different procedures during the same traffic control period, which makes it efficient.

[0018] The deck replacement method according to the present invention performs a procedure for removing the covering plate from the preceding section where the curing of the interfacial concrete has been completed, during the first traffic control period, the second traffic control period, or the third traffic control period of any section after the following section. In other words, the procedure for removing the covering plate is performed during the first traffic control period, the second traffic control period, or the third traffic control period of a section other than the section that is the subject of the procedure. Therefore, it is efficient.

[0019] The deck replacement method according to the present invention includes a step of removing the covering plate, a step of waterproofing the new deck, and a step of paving the new deck. That is, the waterproofing step and the paving step are carried out during the first traffic control period, the second traffic control period, or the third traffic control period in the section other than the section that is the subject of the step, together with the step of removing the covering plate. Therefore, it is efficient.

[0020] In the deck replacement method according to the present invention, after the procedure of removing the covering plates in all sections, the main construction procedure for the other lane adjacent to the replaced lane, which is the lane with the new deck, in the direction perpendicular to the bridge axis, involves a joining procedure in which the new deck slab of the other lane and the new deck slab of the replaced lane are joined with prestressing steel members. After construction of one lane is completed, the new deck slab of the replaced lane and the new deck slab of the other lane are joined, so that prestress is appropriately introduced across the entire width.

[0021] In the deck replacement method according to the present invention, the pre-construction procedure includes a temporary fixing procedure in which the existing deck is temporarily fixed to the main girders via temporary fixing members that span between the main girders in a direction perpendicular to the bridge axis. In the pre-construction procedure, the existing deck is separated from the main girders, while the subsequent first traffic restriction release procedure opens the lanes, so that during the first traffic restriction release period, the existing deck is subjected to the load from traveling vehicles while separated from the main girders. In the present invention, by going through the temporary fixing procedure, the existing deck that has been separated from the main girders is temporarily fixed to the main girders via the temporary fixing members and rejoined, so that the lanes can be safely opened even during the construction period.

[0022] In the deck replacement method according to the present invention, the temporary fixing step includes a hole drilling step of drilling holes in the existing deck in the thickness direction, a suspension bolt installation step of inserting suspension bolts into the holes formed in the hole drilling step, a vertical restraint step of attaching the temporary fixing members to the suspension bolts in a state where they are in close contact with the flanges of the main girders below the existing deck, and a lateral restraint step of fastening the temporary fixing members to the flanges. The vertical restraint step makes it possible to resist the lifting of the existing deck in the vertical direction, and the lateral restraint step makes it possible to resist the displacement of the existing deck in the direction perpendicular to the bridge axis.

[0023] In the deck replacement method according to the present invention, the first traffic control period, the second traffic control period, and the third traffic control period are set to times of day when traffic volume is low, and the first traffic control lift period and the second traffic control lift period are set to times of day when traffic volume is high. For example, by setting the nighttime period, which is a time period when traffic volume is relatively low, as the first traffic control period, the second traffic control period, and the third traffic control period, and setting the daytime period, which is a time period when traffic volume is relatively high, as the first traffic control period, the second traffic control period, and the third traffic control lift period, it is possible to suppress traffic congestion due to construction as much as possible. [Brief description of the drawings]

[0024] [Figure 1] 1 is a schematic diagram for explaining a deck replacement method according to an embodiment of the present invention, in which (a) to (d) show the transition of the construction procedure for each section. [Diagram 2] FIG. 2 is a schematic process diagram showing the steps of the deck replacement method according to the embodiment of the present invention. [Diagram 3] FIG. 3 is a schematic cross-sectional view for explaining a preparation procedure in the deck replacement method according to the embodiment of the present invention. [Figure 4] FIG. 4 is a first schematic cross-sectional explanatory view for explaining a pre-construction procedure in the deck replacement method according to the embodiment of the present invention. [Diagram 5] FIG. 5 is a first schematic plan view illustrating a pre-construction procedure in the deck replacement method according to the embodiment of the present invention. [Figure 6] FIG. 6 is a second schematic cross-sectional explanatory view for explaining a pre-construction procedure in the deck replacement method according to the embodiment of the present invention. [Figure 7] FIG. 7 is a second schematic plan view illustrating a pre-construction procedure in the deck replacement method according to the embodiment of the present invention. [Figure 8] FIG. 8 is a third schematic cross-sectional explanatory view for explaining a pre-construction procedure in the deck replacement method according to the embodiment of the present invention. [Figure 9] FIG. 9 is a third schematic plan view illustrating a pre-construction procedure in the deck replacement method according to the embodiment of the present invention. [Figure 10] FIG. 10 is a schematic diagram showing a state in which a temporary fixing member is used in the deck replacement method according to the embodiment of the present invention. [Figure 11] FIG. 11 is a first schematic explanatory diagram for explaining a temporary fixing procedure in the deck replacement method according to the embodiment of the present invention. [Figure 12] FIG. 12 is a second schematic explanatory diagram for explaining the temporary fixing procedure in the deck replacement method according to the embodiment of the present invention. [Figure 13] FIG. 13 is a third schematic explanatory diagram for explaining the temporary fixing procedure in the deck replacement method according to the embodiment of the present invention. [Figure 14] FIG. 14 is a fourth schematic explanatory diagram for explaining the temporary fixing procedure in the deck replacement method according to the embodiment of the present invention. [Figure 15]FIG. 15 is a fifth schematic explanatory diagram for explaining a temporary fixing procedure in the deck replacement method according to an embodiment of the present invention. [Figure 16] FIG. 16 is a first schematic cross-sectional explanatory diagram for explaining a main construction procedure in the deck replacement method according to the embodiment of the present invention. [Figure 17] FIG. 17 is a first schematic plan view for explaining a main construction procedure in the deck replacement method according to the embodiment of the present invention. [Figure 18] FIG. 18 is a second schematic cross-sectional explanatory diagram for explaining a main construction procedure in the deck replacement method according to the embodiment of the present invention. [Figure 19] FIG. 19 is a second schematic plan view illustrating a main construction procedure in the deck replacement method according to the embodiment of the present invention. [Figure 20] FIG. 20 is a third schematic cross-sectional explanatory view for explaining a main construction procedure in the deck replacement method according to the embodiment of the present invention. [Figure 21] FIG. 21 is a third schematic plan view illustrating a main construction procedure in the deck replacement method according to the embodiment of the present invention. [Figure 22] FIG. 22 is a schematic cross-sectional view for explaining a post-construction procedure in the deck replacement method according to the embodiment of the present invention. [Figure 23] FIG. 23 is a schematic plan view for explaining a post-construction procedure in the deck replacement method according to the embodiment of the present invention. [Figure 24] FIG. 24 is a schematic cross-sectional view for explaining a waterproofing procedure and a paving procedure in the deck replacement method according to the embodiment of the present invention. [Diagram 25] FIG. 25 is a schematic plan view for explaining a waterproofing procedure and a paving procedure in the deck replacement method according to the embodiment of the present invention. [Figure 26] FIG. 26 is a schematic cross-sectional view for explaining a joining procedure in the deck replacement method according to an embodiment of the present invention. [Figure 27] FIG. 27 is a schematic plan view for explaining a joining procedure in the deck replacement method according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, a deck replacement method according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows an outline of the procedure of the deck replacement method according to this embodiment.

[0026] Figure 1 is a schematic plan view of a road 1, showing the flow of construction. The road 1 is made up of two lanes adjacent in the width direction (perpendicular to the bridge axis), for example a driving lane 3 and an overtaking lane 2. The road 1 has multiple sections, divided in the bridge axis direction (towards the left in the figure) into specified ranges for each existing deck slab 4. The sections are defined as two existing deck slabs 4 as one unit, and are arranged in order from the first section, which is the most upstream, to the second section, the third section, and so on, up to the Nth section, which is the most downstream.

[0027] The deck replacement method is divided into one-phase construction and two-phase construction, and the deck is replaced one lane at a time in each phase. Therefore, for example, as shown in Figures 1(a) to (c), in the first phase, traffic is restricted on only a portion of the passing lane 2 on one side, preventing vehicle traffic, while each section of the passing lane 2 is constructed in sequence. During construction, traffic is not restricted on the other driving lane 3, allowing vehicles to pass through.

[0028] After the first phase of construction is completed, as shown in Figure 1(d), in the second phase of construction, traffic is restricted on only a portion of the travel lane 3, preventing vehicular traffic, while construction is carried out on each section of the travel lane 3 in sequence. During construction, traffic is not restricted on the passing lane 2, allowing vehicular traffic to pass through.

[0029] The deck replacement method is carried out during times of the day when traffic volume is relatively low, and construction is suspended during times of relatively high traffic volume. Therefore, for example, construction is carried out under traffic restrictions from night to early morning, when traffic volume is generally low, and construction is suspended and traffic restrictions are lifted during the day, when traffic volume is generally high. Since the time period during which construction can be carried out is limited, the deck replacement method is divided into procedures so that it fits within the time secured by one traffic restriction. Specifically, the entire process of the deck replacement method is mainly divided into three procedures: a pre-construction procedure, a main construction procedure, and a post-construction procedure, and each construction procedure in one section is carried out every time traffic restrictions are imposed. Since each construction procedure is carried out for each section, different construction procedures are carried out in each section at the same time. In other words, the construction procedure in the section that was constructed first (hereinafter referred to as the "preceding section") and the construction procedure in the section that was constructed next to the preceding section (hereinafter referred to as the "following section") are different, and are carried out during the same traffic restriction period.

[0030] For example, as shown in FIG. 1(a), in the first phase of construction, first, pre-construction procedure A is constructed in the first section of the passing lane 2. Then, from the next day onwards, as shown in FIG. 1(b), main construction procedure B is constructed in the first section of the passing lane 2, and at the same time, pre-construction procedure A is constructed in the second section of the passing lane 2. Then, from the next day onwards, as shown in FIG. 1(c), post-construction procedure C is constructed in the first section of the passing lane 2, and at the same time, main construction procedure B is constructed in the second section of the passing lane 2, and at the same time, pre-construction procedure A is constructed in the third section of the passing lane 2. Each construction procedure A, B, and C is repeated for each section until post-construction procedure C of the Nth section is constructed.

[0031] In the second phase, as in the first phase, the pre-construction procedure A is carried out on the first section of the travel lane 3, and then the main construction procedure B is carried out on the first section of the travel lane 3 from the next day onwards, as shown in Figure 1(d). In the second phase, during the main construction procedure B, the passing lane 2 for which the first phase of construction has been completed is regarded as a replaced lane, and this replaced lane is integrated with the adjacent travel lane 3 for each section.

[0032] Next, the process of the deck replacement method will be explained with reference to the drawings. Figure 2 shows an outline of the process of the deck replacement method.

[0033] As shown in Figure 2, the deck replacement method involves at least the following steps: preparation procedure, first traffic control procedure, pre-construction procedure, temporary fixing procedure, first traffic restriction removal procedure, second traffic control procedure, main construction procedure, joining procedure, second traffic restriction removal procedure, third traffic control procedure, post-construction procedure, third traffic restriction removal procedure, covering plate removal procedure, waterproofing procedure, paving procedure, and removal procedure.

[0034] At night, one of the multiple lanes that are the target of replacing the existing deck 4 is restricted by the first traffic control procedure. After the first traffic control procedure, the pre-construction procedure is carried out during the first traffic control period, which spans from nighttime until early morning when traffic is restricted. In the early morning after the pre-construction procedure, the traffic control is lifted by the first traffic control release procedure. During the first traffic control release period, which is daytime after the first traffic control release procedure, traffic restrictions are lifted. At night after the first traffic control release period, traffic is restricted again by the second traffic control procedure.

[0035] After the second traffic control procedure, the main construction procedure is implemented during the second traffic control period, which spans from nighttime until early morning when traffic is restricted. In the early morning after the main construction procedure, the traffic control is lifted again by the second traffic control lifting procedure. During the second traffic control lifting period, which is daytime after the second traffic control lifting procedure, traffic control is lifted. During the nighttime after the second traffic control lifting period, traffic is restricted again by the third traffic control procedure.

[0036] After the third traffic control procedure, the post-construction procedure is carried out during the third traffic control period, which spans from nighttime until early morning when traffic is controlled. In the early morning after the post-construction procedure, the traffic control is lifted again by the third traffic control lifting procedure. The first control procedure to the third traffic control lifting procedure constitute one cycle, and are carried out for each section, with the covering plate removal procedure, waterproofing procedure, and paving procedure being carried out after the post-construction procedure. Therefore, the covering plate removal procedure, waterproofing procedure, and paving procedure for the preceding section are carried out during the first traffic control period, the second traffic control period, or the third traffic control period for any section after the following section. The joining procedure included in the main construction procedure is carried out in the second phase of construction, and not in the first phase of construction.

[0037] With the deck replacement method, construction is suspended and traffic restrictions are lifted during the day, when traffic volume is relatively high (first traffic restriction lifting period, second traffic restriction lifting period, and third traffic restriction lifting period). On the other hand, construction is carried out from nighttime to early morning, when traffic volume is relatively low (first traffic restriction period, second traffic restriction period, and third traffic restriction period).

[0038] Next, each step of the deck replacement method will be explained based on the drawings. Figures 3 to 27 show an outline of the bridge in each step. Figure 3 shows the state where the preparation step is performed, Figures 4 to 9 show the process of performing the pre-construction step, Figures 16 to 21 show the process of performing the main construction step, Figures 22 and 23 show the process of performing the post-construction step, Figures 24 and 25 show the state where the waterproofing step and the paving step are performed, and Figures 26 and 27 show the state where the joining step is performed. Figure 10 shows the state where the temporary fixing step is performed, and Figures 11 to 15 show the process of performing the temporary fixing step.

[0039] As shown in Figure 3, in a bridge 7, multiple existing deck slabs 4 are erected on multiple main girders 8. A wall parapet 10 is formed on the road surface on the shoulder side, and a ground cover 11 is formed on the median strip side. The existing deck slab 4 is made of, for example, precast concrete. A haunch portion 5 that protrudes downward is formed on the underside of the existing deck slab 4, and this haunch portion 5 is placed on an upper flange 9 of the main girder 8, and the existing deck slab 4 is joined to the main girder 8 via stud dowels or the like (not shown).

[0040] In the preparatory procedure, a suspended scaffold 12 is assembled on the underside of the existing deck 4, and a reinforcing vertical beam 13 is attached to the underside of the existing deck 4. The preparatory procedure is carried out on the underside of the existing deck 4, and not on the road surface side, so it can be carried out even while vehicles are traveling. Therefore, the preparatory procedure is carried out during the day and does not involve traffic restrictions. After or in parallel with the preparatory procedure, a first traffic control procedure is carried out. In the first traffic control procedure, the first section (see FIG. 1(a)) at the most upstream of the passing lane 2 and the sections before and after it are restricted, and color cones (registered trademark) and the like are appropriately installed.

[0041] As shown in Figures 4 to 9, in the pre-construction procedure, the underside of the existing deck 4 of the passing lane 2 is cut and separated from the main girder 8, and the cut existing deck 4 is temporarily fixed to the main girder 8.

[0042] In more detail, first, equipment such as a cutting machine 14 for cutting out the existing deck slab 4 and temporary fixing members 18 for temporarily fixing the cut existing deck slab 4 to the main girders 8 (see Figure 10) are brought in and preparations for construction are made.

[0043] As shown in Figures 4 and 5, a cutting machine 14 such as a wire saw or a road cutter is used to cut the ground cover 11 for each existing deck slab 4.

[0044] As shown in Figs. 6 and 7, the lower surface of the existing deck 4 is cut by a horizontal cutting machine 15. The horizontal cutting machine 15 is composed of a guide rail (not shown) attached to the underside of the main girder 8 and the existing deck 4, a pulley 16 that moves along the guide rail, and a wire saw 17 hung on the pulley 16. The guide rail is long and is attached on both sides of the main girder 8 along the longitudinal direction (bridge axis direction) of the main girder 8. The pulleys 16 are attached to each guide rail and rotate on a horizontal plane with the vertical direction as their axis of rotation. The wire saw 17 is hung on the pulley 16 across the haunch portion 5 of the existing deck 4. Therefore, when the pulley 16 advances along the guide rail while rotating, the wire saw 17 cuts the haunch portion 5 together with the stud dowel. The cutting portion is in the haunch portion 5 near the boundary between the haunch portion 5 and the upper flange 9. The cut existing deck 4 is temporarily fixed to the main girder 8 through a temporary fixing procedure. The horizontal cutting machine 15 and other equipment are then transported to the next section where construction is scheduled to take place.

[0045] As shown in Figures 8 and 9, in the temporary fixing procedure, the existing deck 4 is temporarily fixed to the main girders 8 via temporary fixing members 18 that span between the main girders 8 in the width direction of the passing lane 2 (perpendicular to the bridge axis). More specifically, as shown in Figure 10, the temporary fixing members 18 are long metal beams with a length equivalent to the length between the main girders 8. The temporary fixing members 18 join the existing deck 4 and the main girders 8 on the underside of the existing deck slab 4. The temporary fixing members 18 are fixed to the upper flange 9 of the main girder 8 by fixing brackets 19 with both ends in close contact with the upper flange 9 of the main girder 8, and are suspended by hanging bolts 20 inserted into holes 33 in the existing deck slab 4. The temporary fixing members 18 are fixed to the underside of the existing deck slab 4 via the hanging bolts 20, and a T load (100 kgN) is applied to the end of the existing deck slab 4 on the wall parapet 10 side, so that the hanging bolts 20 and temporary fixing members 18 provide resistance to the existing deck slab 4 lifting up in the vertical direction. In addition, they are fixed to the upper flange 9 via fixing brackets 19, and a collision load (SB type: 58 kgN) is applied horizontally to the wall parapet 10, so that they provide resistance to the existing deck slab 4 shifting in the width direction (perpendicular to the bridge axis). The temporary fixing procedure is explained below.

[0046] As shown in Figs. 11 to 15, the temporary fixing procedure includes at least a hole drilling procedure, a hanging bolt installation procedure, a vertical restraint procedure, a lateral restraint procedure, and a restoration procedure.

[0047] As shown in Fig. 11, in the drilling procedure, holes are drilled in the thickness direction of the existing deck 4. For example, holes are drilled in the pavement 32 and the existing deck 4 using a diamond core drill or the like (not shown) to form holes 33. The diameter of the holes 33 is smaller in the existing deck 4 than in the pavement 32, so that an edge 34 is formed due to the difference in hole diameter.

[0048] As shown in Fig. 12, in the hanging bolt installation procedure, the hanging bolt 20 is inserted into the hole 33 formed in the hole drilling procedure. The hanging bolt 20 is in a position in which the head 21 is engaged with the edge 34 and the bolt body 22 protrudes downward from the hole 33. Concrete adhering to the upper flange 9 of the main girder 8 is removed. As shown in Fig. 13, the stopper fitting 23, the receiving fitting 26, and the washer 27 are attached to the bolt body 22 from the tip side of the bolt body 22. A steel sheet pile 28 is installed between the cut haunch portion 5 and the upper flange 9.

[0049] As shown in Figure 14, in the vertical restraint procedure, temporary fixing member 18 is placed on receiving metal fitting 26 below the existing deck slab 4, and washer 27 is tightened, so that temporary fixing member 18 is attached to hanging bolt 20 in a state of close contact with upper flange 9 of main girder 8. Tube portion 24 of stopper fitting 23 is inserted into hole 33 from the underside of the existing deck slab 4, and with temporary fixing member 18 in close contact with seat plate portion 25 of stopper fitting 23, seat plate portion 25 and temporary fixing member 18 are clamped by clamping tool 29. Stopper fitting 23 acts as a shear key, preventing displacement in the width direction (perpendicular to the bridge axis).

[0050] As shown in Figure 15, in the lateral restraint procedure, a temporary fixing member 18 is fastened to the upper flange 9 of the main girder 8 via a fixing bracket 19. The fixing bracket 19 has a step 31 formed therein, and is attached to the side of the temporary fixing member 18 with this step 31 engaged with the upper flange 9. The fixing bracket 19 acts as a shear key, preventing slippage in the lateral direction (perpendicular to the bridge axis). In the restoration procedure, holes 33 in the pavement 32 are filled with asphalt or the like.

[0051] As described above, the pre-construction procedure (including the temporary fixing procedure) is carried out. After the pre-construction procedure, the first traffic restriction release procedure is carried out, and the traffic restrictions are lifted. After the first traffic restriction release period has elapsed, the second traffic restriction procedure is carried out, and the first section of the passing lane 2 that was the subject of the pre-construction procedure and the sections before and after it are restricted. During this second traffic restriction period, the main construction procedure is carried out in the first section, and the pre-construction procedure described above is carried out in the second section (see Figure 1(b)).

[0052] 16 to 21, in the main construction procedure, a new deck 6 is erected in place of the existing deck 4, and a cover plate 38 is installed on the new deck 6. The new deck 6 is, for example, made of precast concrete.

[0053] 16 and 17, a cutting machine 14 is used to cut the existing deck 4 in the bridge axis direction and perpendicular to the bridge axis. The temporary fixing members 18 and other parts are removed, and protective equipment such as guardrails (not shown) are also temporarily removed.

[0054] As shown in Figures 18 and 19, an erection machine 35 is brought in to replace the existing deck 4 with a new deck 6. The erection machine 35 has four legs 36 for self-supporting, and a deck transport section 37 for lifting and moving each deck 4, 6. Since the legs 36 can be freely opened, closed, and extended, the erection machine 35 is transported on a trailer or the like (not shown) with the legs 36 contracted and stored. On the other hand, during construction, the legs 36 are deployed and extended to become self-supporting. The time required from storage to deployment (or from deployment to storage) is about 30 minutes.

[0055] The two existing deck slabs 4 are removed by the erection machine 35. The upper flange 9 of the main girder 8 is scraped, coated with a rust inhibitor, and fitted with a seal sponge (all not shown). The two new deck slabs 6 are erected by the erection machine 35. Holes are drilled in the area of ​​the new deck slab 6 directly above the upper flange 9, and stud dowels are melt-fitted into the upper flange 9 through the openings formed by the drilling. Adjustment mortar is poured into the gap between the new deck slab 6 and the upper flange 9, and the gap is cured. Mortar is poured into the vertical joints between the new deck slab 6 and the existing deck slab 4 of the travel lane 3 adjacent in the width direction, and the gap is cured. Mortar is poured into the openings in the new deck slab 6, and the gap is cured.

[0056] As shown in Figures 20 and 21, a covering plate 38 is installed on the new deck 6, and the grooves around the covering plate 38 are appropriately filled. The covering plate 38 is a flat plate-shaped member made of fiber reinforced plastics (FRP). The covering plate 38 has a plurality of reinforcing members (not shown) arranged between two plates facing each other. The reinforcing members include a first reinforcing member that extends longitudinally in the bridge axis direction, and a second reinforcing member that extends along the four sides of the covering plate. Each reinforcing member is in the shape of a square tube, and the first reinforcing members are arranged in parallel with gaps in the direction perpendicular to the bridge axis. The lining plate 38 is available in a number of different sizes, including, for example, a type A lining plate 38a that is installed between the newly constructed deck slabs 6 to cover the gap between the newly constructed deck slabs 6, a type B lining plate 38b that is installed directly above the newly constructed deck slab 6 to avoid the gap, and a type C lining plate 38c that covers the space between the new deck slab 6 and the existing deck slab 4. The lining plate 38 is appropriately fixed with anchor bolts or the like (not shown).

[0057] The protective equipment is restored and the erection machine 35 is removed. Temporary road markings (not shown) are installed, and finally the road surface is cleaned.

[0058] As described above, the main construction procedure is carried out. After the main construction procedure, the second traffic restriction release procedure is carried out, and the traffic restrictions are lifted. After the second traffic restriction release period has elapsed, the third traffic restriction procedure is carried out, and the first section that was the subject of the main construction procedure and the sections before and after it of the passing lanes are restricted. During this third traffic restriction period, the post-construction procedure is carried out in the first section, the above-mentioned main construction procedure is carried out in the second section, and the above-mentioned pre-construction procedure is carried out in the third section (see Figure 1(c)).

[0059] As shown in Figures 22 and 23, in the post-construction procedure, the covering plate 38 is removed, filler concrete 39 is poured between the newly constructed deck slabs 6, and the covering plate 38 is then installed again on top of the newly constructed deck slab 6.

[0060] More specifically, as shown in Figures 22 and 23, the type A lining plate 38a is removed leaving behind the type B lining plate 38b, and reinforcing bars (not shown) are arranged in the gap between the newly constructed deck slabs 6. Filling concrete 39 is poured into the horizontal joints (filling portion) in the bridge axis direction and cured. The type A lining plate 38a is then installed again on top of the gap.

[0061] As described above, the post-construction procedure is carried out. After the post-construction procedure, the third traffic restriction release procedure is carried out and the traffic restriction is lifted. The above pre-construction procedure, main construction procedure and post-construction procedure are repeatedly carried out until the Nth section of the passing lane is constructed.

[0062] Of the sections where the post-construction procedure has been completed, the covering plate removal procedure is carried out in sections where the curing of the filling concrete 39 has been completed. As shown in Figures 24 and 25, after the covering plate removal procedure is carried out, a waterproofing procedure for waterproofing the new deck slab 6 and a paving procedure for paving the new deck slab 6 are carried out. Since the covering plate removal procedure, waterproofing procedure and paving procedure are carried out for multiple sections at once, they are carried out within the first traffic control period, the second traffic control period and the third traffic control period of any of the following sections.

[0063] The first phase of construction will be completed when the procedures for removing the covering plate, waterproofing, and paving are completed for all of the first through Nth sections of the passing lane 2. In the second phase of construction, the procedures for the other driving lane 3 are carried out in the same manner as for the passing lane 2. The second phase of construction differs from the first phase in that it includes the procedures for constructing the wall parapet 10 instead of the ground covering 11, and the joining procedures for integrating the passing lane 2 and the driving lane 3 with the PC steel 40.

[0064] In the main construction procedure of the second stage construction, after the existing deck 4 is cut, the wall balustrade grinding jig (not shown) is removed before the erection machine 35 is brought in. The new deck 6 is erected by the erection machine 35, and the stud dowel is melted and attached to the upper flange 9 of the main girder 8, and then the joining procedure is carried out. As shown in Figures 26 and 27, in the joining procedure, the horizontal fastening sheath pipe 41 of the new deck 6 of the travel lane 3 and the horizontal fastening sheath pipe 41 of the new deck 6 of the passing lane 2 are connected by a coupler 42 or the like in the same section. Formwork is assembled in the vertical joints between the new deck slabs 6, mortar is poured into the vertical joints, and curing is performed. The PC steel 40 is passed through the horizontal fastening sheath pipe 41, and the PC steel 40 is tensioned by a jack or the like (not shown), and the new deck slabs 6 are joined together. A grout material or the like is injected into the horizontally tightened sheath pipe 41. After the covering plate 38 is installed on the new deck 6, the wall parapet 10 is restored again. The other procedures are the same as those in the first stage construction.

[0065] In the removal procedure, the suspended scaffolding 12 and the vertical beams 13 are dismantled and removed. With the above, the construction work is completed.

[0066] Next, the effects of this embodiment will be described.

[0067] This embodiment is divided into a pre-construction procedure, a main construction procedure, and a post-construction procedure, and each procedure is carried out from night to early morning when traffic volume is relatively low, while construction is suspended and traffic restrictions are lifted during the day when traffic volume is relatively high. Therefore, traffic congestion due to construction can be suppressed as much as possible.

[0068] Since the time period during which construction can be performed is limited to nighttime through early morning, this embodiment is mainly divided into three procedures, a pre-construction procedure, a main construction procedure, and a post-construction procedure, and is designed to fit within the time allowed by a single traffic control. In addition, the erection machine 35 for replacing the existing deck 4 with the new deck 6 can be deployed from storage (or deployed from storage) in about 30 minutes, and is transported on a trailer or the like, which contributes to shortening the construction time.

[0069] In particular, in the pre-construction procedure, the haunch portion 5 of the existing deck 4 is separated from the upper flange 9 of the main girder 8, so that in the main construction procedure, when replacing the existing deck 4 with the new deck 6, the existing deck 4 is cut in advance, so that the existing deck 4 can be easily removed. Therefore, it is efficient. Also, in the main construction procedure, a covering plate 38 is installed on the new deck 6, and the covering plate 38 serves as a pavement, so that the lane can be safely opened even during the construction period. In other words, the curing of the filling concrete 39 poured in the filling portion between the new deck slabs 6 can be postponed to the later post-construction procedure, and the traffic restrictions can be lifted.

[0070] In this embodiment, during the first traffic restriction lifting period, the existing deck 4 will be subjected to the load from traveling vehicles while detached from the main girders 8; however, by going through the temporary fixing procedure, the existing deck slab 4 that has been detached from the main girders 8 is temporarily fixed to the main girders 8 via the temporary fixing members 18 and rejoined, allowing the lanes to be opened safely even during the construction period.

[0071] In this embodiment, the temporary fixing member 18 is fixed to the underside of the existing deck slab 4 via the hanging bolt 20, and a T load (100 kgN) is applied to the end of the existing deck slab 4 on the wall balustrade 10 side, so that the hanging bolt 20 and the temporary fixing member 18 provide resistance to the existing deck slab 4 lifting up in the vertical direction.

[0072] In addition, it is fixed to the upper flange 9 via fixing brackets 19, and a collision load is applied horizontally to the wall parapet 10, providing resistance to shifting of the existing deck slab 4 in the width direction (perpendicular to the bridge axis).

[0073] In this embodiment, the pre-construction procedure, main construction procedure, and post-construction procedure are performed as one cycle for each section, and during the same traffic regulation period, separate construction procedures are performed for the preceding section and the following section. That is, for example, during the second traffic regulation period, the main construction procedure is performed in the first section and the pre-construction procedure is performed in the second section, and during the third traffic regulation period, the post-construction procedure is performed in the first section, the main construction procedure is performed in the second section, and the pre-construction procedure is performed in the third section. This is therefore efficient.

[0074] In this embodiment, among the sections where the post-construction procedure has been completed, in a plurality of sections where the curing of the filling concrete 39 has been completed, the covering plate removal procedure, the waterproofing procedure, and the paving procedure are all carried out within the first traffic control period, the second traffic control period, and the third traffic control period of any of the following sections. Therefore, it is efficient.

[0075] In this embodiment, after construction of the passing lane 2 is completed in the first phase of construction, in the main construction procedure for the second phase of construction, the new deck slab 6 of the passing lane 2 and the new deck slab 6 of the traveling lane 3 are joined by PC steel 40, so that prestress is appropriately introduced across the entire width.

[0076] In another embodiment of the invention, the travel lanes are constructed in one phase and the passing lanes are constructed in a second phase. In other embodiments, the amount of traffic volume is determined based on correlation with weekdays, holidays, region, etc., so that times of day with low traffic volume may be during the day, and times of day with high traffic volume may be from the night to the early morning. In other embodiments, one existing deck slab, or three or more existing deck slabs, is one unit of a section.

[0077] Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various design modifications can be made to the present invention without departing from the scope of the claims. [Explanation of symbols]

[0078] 1 road 2 Passing lane 3 Travel lanes 4 Existing deck 5 Haunch 6 New deck 7 Bridges 8 main girders 9 Upper flange 10. Wall Parapet 11 Earth Cover 12 Suspended scaffolding 13 Stringer 14 Cutting machine 15 horizontal cutting machine 16 Pulley 17 Wire Saw 18 Temporary fixing material 19 Fixing bracket 20 Hanging bolt 21 Head 22 Bolt body 23 Stopper metal fitting 24 Cylinder part 25 Seat plate part 26 Receptacle 27 Washer 28 Steel sheet pile 29 Clamping tool 31 Stepped section 32 Pavement 33 holes 34 Edge 35 Erection machine 36 Legs 37 Deck transport section 38 Covering plate 38a Type A Covering Plate 38b Type B Covering Plate 38c Type C Cover Plate 39 Filling concrete 40 PC steel material 41 Horizontally tightened sheath tube 42 Coupler A Pre-construction procedure B. Main construction procedure C Post-construction procedure

Claims

1. a first traffic control procedure for controlling traffic on one of a plurality of lanes that are to be replaced with an existing deck; A pre-construction step of cutting the underside of the existing deck of the lane to separate it from the main girder and temporarily fixing the existing deck to the main girder during a first traffic control period during which traffic is controlled after the first traffic control step; a first traffic restriction release step of releasing the traffic restriction after the pre-construction step; a second traffic regulation procedure for regulating traffic on the lane after a first traffic regulation lifting period, which is a period during which the traffic regulation is lifted after the first traffic regulation lifting procedure; A main construction procedure of erecting a new deck slab in place of the existing deck slab and installing a covering plate on the new deck slab during a second traffic control period in which traffic is controlled after the second traffic control procedure; A second traffic regulation release procedure for releasing the traffic regulation after the main construction procedure; a third traffic regulation procedure for regulating traffic on the lane after a second traffic regulation lifting period during which the traffic regulation is lifted after the second traffic regulation lifting procedure; A post-construction procedure in which, during a third traffic control period in which traffic is controlled after the third traffic control procedure, the covering plate is removed, filler concrete is poured between the newly constructed deck slabs, and the covering plate is again installed on the newly constructed deck slab; A third traffic regulation release step of releasing the traffic regulation after the post-construction step, A deck replacement method characterized by the above.

2. The lane has a plurality of sections by being divided into predetermined ranges for each of the existing decks in the bridge axis direction, The pre-construction procedure of the following section adjacent to the preceding section is carried out during the second traffic control period of the preceding section, The main construction procedure of the following section is performed within the third traffic control period of the preceding section. A deck replacement method according to claim 1.

3. A procedure for removing the covering plate from the preceding section where the curing of the filling concrete has been completed is performed within the first traffic control period, the second traffic control period, or the third traffic control period of any of the sections after the following section.

3. A deck replacement method according to claim 2.

4. After the covering plate removal procedure, a waterproofing procedure is performed to waterproof the new deck slab, and a paving procedure is performed to pave the new deck slab.

4. The deck replacement method according to claim 3.

5. After the procedure for removing the lining plates for all the sections has been completed, In the main construction procedure for the lane on the other side adjacent to the replaced lane, which is the lane of the new deck, in the direction perpendicular to the bridge axis, A joining procedure is performed in which the new deck of the other lane and the new deck of the replaced lane are joined with PC steel members.

4. The deck replacement method according to claim 3.

6. The pre-construction step comprises: A temporary fixing step of temporarily fixing the existing deck to the main girder via a temporary fixing member extending between the main girders in a direction perpendicular to the bridge axis, 3. A deck replacement method according to claim 1 or 2.

7. The temporary fixing step includes: A drilling step of drilling holes in the existing deck in a thickness direction; a hanging bolt installation step of inserting a hanging bolt into the hole formed in the hole drilling step; A vertical restraining step of attaching the temporary fixing member to the suspension bolt in a state in which the temporary fixing member is in close contact with the flange of the main girder below the existing deck; and a lateral restraining step of fastening the temporary fastening member to the flange. A deck replacement method according to claim 6.

8. The first traffic regulation period, the second traffic regulation period, and the third traffic regulation period are time periods of a day with low traffic volume, The first traffic regulation lifting period and the second traffic regulation lifting period are set to be periods of time during which traffic volume is high in one day.

3. A deck replacement method according to claim 1 or 2.

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