JP2021188454A - Bridge floor slab replacement method - Google Patents

Abstract

To provide a bridge floor slab replacement method that can efficiently replace an existing floor slab with a new precast concrete floor slab.SOLUTION: A bridge floor slab replacement method includes: a first step of removing at least a part of an existing floor slab piece formed by dividing an existing floor slab of a bridge in the bridge axis direction to expose a main girder; a second step of installing a stud dowel on the upper surface of the main girder exposed in the first step; and a third step of installing a plurality of new floor slabs on the main girder on which the stud dowel is installed in the second step and joining the new floor slabs to the main girder and then joining the adjacent new floor slabs. The first step to the third step are performed during a construction traffic regulation time zone and include cases where two or more steps are continuously carried out within the construction traffic regulation time zone. When the first step or the second step is carried out immediately before a traffic release time zone comes, a temporary lining floor slab is installed on the main girder which is exposed at the end of the work.SELECTED DRAWING: Figure 4

Description

The present invention relates to a bridge floor slab replacement method in which an existing floor slab is replaced with a new precast floor slab while alternately repeating a construction traffic regulation time zone and a traffic release time zone.

Conventionally, in a large-scale road bridge equipped with a bridge for the up lane and a bridge for the down lane, when performing renewal work to replace the existing floor slab of the bridge with a new floor slab, it is for the up lane and the down lane. Of the bridges in the above, one of the bridges is completely closed to renewal work, and the other bridge is restricted to face-to-face traffic.

However, in heavy traffic routes such as urban areas and mountainous areas sandwiched between long tunnels, if face-to-face traffic restrictions are enforced for a long period of time, the traffic environment in the surrounding area may be adversely affected. For this reason, there is a demand for a method of restricting lanes only at night, performing renewal work, and completely releasing traffic during the day. For example, in Patent Document 1, as a method of constructing a bridge deck that regulates roads at night and replaces an existing deck with a new deck, workers are divided into a PC deck laying group and a padded concrete group. The method is disclosed.

Specifically, after the PC floor slab laying group cuts and removes the existing floor slab on the main girder, a new precast floor slab is laid in parallel in the direction of the bridge axis, and the joints of the adjacent precast floor slabs are provisionally laid. Cover with a lining plate. After that, temporary pavement is performed on the upper surface of the temporary lining plate, and the work for one night is completed. The PC floor slab laying team repeats this work every day until the floor slab in the planned replacement section is removed.

On the other hand, the padded concrete team started work a few days later, removing the temporary pavement and temporary lining deck from the new precast deck laid in parallel in the direction of the bridge axis, and the adjacent new precast floor. Pave concrete is placed at the joints of the slab. Then, after the curing of the padded concrete is completed, temporary pavement is performed to complete the work for one night. The padded concrete team repeats this work every day until the padded concrete has been placed in all the joints of the adjacent new precast deck slabs laid in the planned replacement section.

Japanese Unexamined Patent Publication No. 2012-82222

As described above, Patent Document 1 presupposes that, of the series of work for replacing the existing precast deck with the new precast deck, the work until the new precast deck is laid is for one night. .. However, although not clarified in Patent Document 1, in general, various treatments such as cleaning work and stud gibber installation work are required on the upper surface of the main girder exposed after the removal of the existing floor slab.

Considering these complicated works, if any unexpected situation occurs during the construction, there is a possibility that the work up to the laying of the new precast deck cannot be completed overnight. In addition, even if it can be completed overnight, in the series of work processes for replacing the existing floor slab with the new precast floor slab, the timing when traffic release can be carried out is after the laying of this new precast floor slab. Limited to the period immediately before placing the precast concrete.

For this reason, it is difficult to adjust the progress of the work process to be carried out within one construction traffic regulation time zone according to the site conditions, construction conditions, and the like. In addition, as mentioned above, since it is assumed that the work until the new precast floor slab is laid for one night, after laying the new floor slab, the interstitial concrete is poured into the joints and the main pavement is carried out. The method for carrying out the series of work up to overnight is not specified.

The present invention has been made in view of the above problems, and a main object thereof is to provide a bridge deck replacement method capable of efficiently replacing an existing deck with a new precast concrete deck. It is to be.

In order to achieve this object, the bridge deck replacement method of the present invention precasts an existing deck installed on a steel main girder while alternately repeating a construction traffic regulation time zone and a traffic release time zone. It is a method of replacing a deck deck with a new concrete deck, and at least a part of the existing deck pieces formed by dividing the existing deck of the bridge in the direction of the bridge axis is removed. The first step of exposing the main girder, the second step of installing the stud gibber on the upper surface of the main girder exposed in the first step, and the above-mentioned step of installing the stud gibber in the second step. A third step of installing a plurality of the new floor slabs on the main girder, joining the new floor slabs to the main girder, and then joining adjacent new floor slabs is provided, and the first step is provided. The third step is carried out during the construction traffic regulation time zone, and includes a case where two or more steps are continuously carried out within one construction traffic regulation time zone, and the traffic release time. When the first step or the second step is carried out immediately before the arrival of the band, it is characterized in that a temporary lining deck is installed on the main girder which is exposed at the end of the work. ..

The bridge deck replacement method of the present invention is characterized in that the first step to the third step are repeated in the direction of the bridge axis each time the construction traffic regulation time zone arrives.

According to the bridge floor slab replacement method of the present invention, the work process required for replacing the existing floor slab with the new floor slab is divided into a first step and a third step in which the construction can be interrupted. In addition, when carrying out these processes during the construction traffic regulation time zone, include the case where two or more processes are continuously carried out within one construction traffic regulation time zone, and the construction traffic regulation time zone and traffic release. Repeat the time zone. As a result, the stage of suspending the construction can be appropriately selected according to the site conditions and the construction status (for example, the progress status of the cleaning work and the installation work of the stud gibber), so that once while preparing for the arrival of the traffic release time zone. It is possible to adjust the progress of the work process to be carried out within the construction traffic regulation time zone, and it is possible to efficiently carry out the replacement work of the new floor slab.

Therefore, if the construction traffic regulation time zone is set at night, it is possible to realize the daytime traffic release, and the bridge that is going to implement the existing floor slab replacement method is sandwiched between heavy traffic roads such as urban areas and long tunnels. Even if it is located in a mountainous area, it is possible to carry out the construction while minimizing the impact on the traffic environment in the surrounding area.

Further, the deck replacement method for a bridge of the present invention is characterized in that the cross section of the existing deck piece seen from the bridge axis direction is formed into a half cross section obtained by dividing the cross section of the existing deck in half. ..

According to the bridge deck replacement method of the present invention, the cross section of the existing deck is divided in half, and the existing deck for one of the half sections is divided in the direction of the bridge axis to obtain a plurality of existing deck pieces. It is possible to use it in the so-called semi-section floor slab replacement method, in which the floor slab is removed and replaced with a new floor slab. As a result, for example, in a large-scale road bridge equipped with a bridge for an up lane and a bridge for a down lane, a regulation to reduce the number of lanes of the other bridge while leaving one of the bridges free for traffic is imposed at night. If done, it will be possible to replace the existing floor slab while realizing full daytime traffic release.

Therefore, unlike the conventional construction method, it is not necessary to carry out road regulation such that one of the bridges is completely closed to traffic and the other bridge is restricted to two-way traffic. For this reason, it is possible to ensure the safety of passing vehicles, and it is not possible to implement face-to-face traffic restrictions due to circumstances such as road structure, or even if it is possible, long-term face-to-face traffic may be implemented depending on the traffic conditions in the surrounding area. Even in a road environment with various issues such as difficulty in regulation, it is possible to reliably carry out replacement work for existing floor slabs.

Further, the floor slab replacement method for a bridge of the present invention is characterized in that, in a third step, adjacent new floor slabs are joined by a main plate that functions as a part of the new floor plate.

According to the floor slab replacement method for bridges of the present invention, adjacent new floor slabs are joined by a main plate that functions as a part of the new floor plate, so that this main plate is formed by the adjacent new floor slabs. By arranging it on the upper surface of the joint portion, it is possible to prioritize the work of applying the main pavement prior to the work of filling the joint portion with the interstitial concrete. As a result, it is possible to fill the joints with padded concrete from the lower side of the new floor slab while releasing traffic after the main pavement is applied, reducing the work to be carried out during construction traffic regulation hours. It is possible to greatly improve work efficiency.

In the bridge floor slab replacement method of the present invention, after the temporary lining floor slab is installed on the main girder, the upper and lower surfaces of the joints adjacent to the temporary lining floor slab are covered with opening closing plates, and the opening is opened. It is characterized in that the closing plates are fastened to each other via a fastener.

According to the bridge floor slab replacement method of the present invention, when the temporary lining floor slab is installed on the main girder, the opening of the joints formed adjacent to the temporary lining floor slab is closed. Since it can be easily carried out using a plate, it is possible to greatly improve the workability related to installation and removal as compared with the case of filling with a filler, and to contribute to shortening the construction period.

According to the present invention, it is possible to appropriately select the stage at which the work is interrupted according to the site conditions, the construction situation, etc. Therefore, in preparation for the arrival of the traffic release time zone, the lane regulation time zone is effectively utilized and the new construction is efficiently established. It becomes possible to carry out the replacement work of the floor slab.

It is a figure explaining the half-section floor slab replacement method in embodiment of this invention. It is a figure which shows the flow of the half-section floor board replacement method in embodiment of this invention. It is a figure which shows the outline of the half-section floor board replacement method in embodiment of this invention. It is a figure which shows the flow of the floor slab replacement method of a bridge in embodiment of this invention. It is a figure which shows the outline of the floor slab replacement method of a bridge in embodiment of this invention. It is a figure which shows the temporary lining floor slab in embodiment of this invention. It is a figure which shows the new floor slab of a precast concrete structure in embodiment of this invention. It is a figure which shows the 1st process of the floor slab replacement method of a bridge in embodiment of this invention. It is a figure which shows the state of the temporary space filling of the floor slab replacement method of a bridge in embodiment of this invention. It is a figure which shows the 2nd process of the floor slab replacement method of a bridge in embodiment of this invention. It is a figure which shows the 3rd process of the floor slab replacement method of a bridge in embodiment of this invention. It is a figure which shows the procedure of the main pavement when the 1st to 3rd steps of the floor slab replacement method of a bridge in embodiment of this invention are repeated. It is a figure which shows the joining of the new floor slab of a traveling lane and the new floor slab of an overtaking lane in the embodiment of the present invention. It is a figure which shows the example of the construction procedure of the traveling lane and the overtaking lane in the embodiment of this invention. It is a figure which shows the other example of the floor slab replacement method of a bridge in embodiment of this invention.

In the bridge floor slab replacement method of the present invention, the existing floor slab is replaced with a new floor slab while alternately repeating the construction traffic regulation time zone and the traffic release time zone including both the lane regulation time zone and the traffic closure regulation time zone. It is a method that can adjust the progress of the work process to be carried out within one construction traffic regulation time zone.

Such a bridge floor slab replacement method can be adopted for all-section construction that closes the construction lane, but in this embodiment, the bridge floor slab replacement method is replaced with a half-section floor slab. The details will be explained by taking as an example the case of adopting it in the construction method.

≪≪Semi-section floor slab replacement method≫≫
As shown in FIG. 1A, in the half-section deck replacement method, for example, in a road bridge B provided with a bridge B1 for two up lanes and a bridge B2 for two down lanes, the bridge B1 is lane-controlled and traveled. The existing floor slab 1 for one half section of either the lane side or the overtaking lane side is replaced with a new floor slab, and before and after this, the existing floor slab 1 for the other half cross section is also a new floor slab. It is a method to replace with.

The flow of the half-section floor slab replacement method will be described below with reference to FIG. 3 along with the flow chart of FIG. 2. First, as shown in FIG. 3A, the bridge B1 for two lanes going up , The construction target area is divided in the direction of the bridge axis, and multiple sections are set (first step).

Next, as shown in FIG. 3B, each section is divided in the direction orthogonal to the bridge axis, the traveling lane side is set to the working sections D1, D2, D3, and the overtaking lane side is set to the working sections O1, O2. , O3 ... (2nd step).

When the work section is set, the floor slab replacement method is carried out for the work section D1 on the driving lane side of the first section (step 3-1). Next, the floor slab replacement method is carried out for the work section O1 on the overtaking lane side of the first section (step 3-1).

Hereinafter, the floor slab replacement method will be described with a focus on the work section D1. In the present embodiment, as shown in FIG. 1 (b), the existing floor slab 1 in the work section D1 is moved from the upstream side (right side in the bridge axis direction in FIG. 1) to the downstream side (bridge axis in FIG. 1) of the up two lanes. It will be replaced with the new floor slab 3 in order toward the left side in the direction).

Explaining the flow of the floor slab replacement method with reference to the conceptual diagrams of FIGS. 1 (b) and 5 along the flow chart of FIG. 4, first, as shown in FIG. 1 (b), on the traveling lane side. A plurality of existing floor slab pieces 11 are formed in the set work section D1 (Step 1). In this embodiment, six existing floor slab pieces 11 are formed, and these shapes are formed to a size capable of transporting a vehicle after being removed.

Next, as shown in FIG. 5A, two of the six existing deck pieces 11 are separated from the existing deck 1 and removed (Step 2). Then, a part of the main girder 2 made of I-shaped steel is exposed in the removal trace of the existing floor slab piece 11, so that the upper surface of the upper flange of the exposed main girder 2 is prepared (Step 3). As shown in 5 (b), the stud gibber 21 is installed (Step 4).

After that, as shown in FIG. 5 (c), a new precast concrete floor slab 3 is installed on the upper flange of the main girder 2 (Step 5), and a stud girder 21 is newly installed by placing a non-shrink mortar 4. The deck 3 is joined to the main girder 2 (Step 6). Then, the main plate 52 is installed across the horizontal joint portion J1 (the joint portion extending in the direction orthogonal to the bridge axis), and the upper surface edges of the new floor slab 3 are joined to each other (Step 7).

Then, the work of applying the main pavement 6 to the upper surface of the new floor slab 3 to make the vehicle passable (Step 8), and striking the interstitial concrete 51 into the horizontal joint portion J1 located on the lower surface side of the main plate 52. Perform the setting work (Step 9) at the same time or before and after. The main pavement 6 refers to a grade of pavement referred to as the main pavement in the half-section floor slab replacement method.

By repeating the above steps of Steps 2 to 9 until the existing floor slab piece 11 in the work section D1 is exhausted, it corresponds to the inside of the work section D1, that is, the traveling lane side of one section of the bridge B1 for the uphill two lanes. The floor slab replacement work for the half section is completed. In the present embodiment, since two of the six existing deck pieces 11 are removed in the Step 2 step, the Step 2 to Step 9 steps are repeated three times, but the existing deck to be removed in the Step 2 step is removed. The quantity of the pieces 11 may be any.

Such a step of Step 1 for forming a plurality of existing floor slabs 11 in the work section D1 and steps 2 to 9 for the plurality of existing floor slabs 11 in the work section D1 are repeated after the end of Step 1. The process is for one cycle. Therefore, the construction period required for one cycle can be appropriately adjusted according to the distance range in the bridge axis direction set in the work section D1.

The existing floor slab replacement method according to the above procedure shows the case where lane regulation can be performed day and night for a certain period (weeks to months). However, if you try to set a traffic release time zone during the daytime during this construction period, you can set a lane regulation time zone at night and carry out the construction, and just interrupt the construction by the time the traffic release time zone arrives. Instead, it becomes necessary to make the work area D1 in a state where vehicles can pass each time it is interrupted.

Therefore, as shown in the flow of FIG. 4, the steps of Steps 2 to 9 that are repeatedly carried out in the work section D1 after the end of Step 1 are divided into the first to third steps in which the construction can be interrupted. The first step is a step of removing the existing floor slab piece 11 and preparing the upper surface of the main girder 2 (Steps 2 and 3), and the step of creating the existing floor slab piece 11 of Step 1 carries out the first step. It is the previous work.

The second step is a step (Step 4) of installing the stud gibber 21 on the upper surface of the main girder 2. Further, the third step is a step (Steps 5 to 9) of installing the new floor slab 3, joining the adjacent new floor boards 3, and applying the main pavement 6.

At this time, the construction traffic regulation time zone and the traffic release time include the case where two or more of the first to third steps are continuously carried out within one construction traffic regulation time zone. Repeat the band.

Any combination thereof may be used, but for example, after the first step is performed within the preceding lane regulation time zone, the second step and the third step are continuously performed within the following lane regulation time zone. To carry out. Alternatively, after the first step and the second step are continuously carried out within the preceding lane regulation time zone, the third step is carried out within the following lane regulation time zone. In these cases, the traffic release time zone can be secured twice, after the end of the first process or after the end of the second process, and after the end of the third process.

Alternatively, within the preceding lane regulation time zone, the first step to the third step are continuously carried out, and as shown in FIGS. 5 (a) to 5 (c), a part of the work section D1. Two of the six existing floor slabs 11 are removed, a new floor slab 3 is laid, and the main pavement 6 is applied. After that, the first step to the third step are continuously carried out within the lane regulation time zone of the following, and two of the remaining four existing floor slab pieces 11 in the work section D1 are used. It may be removed and a new floor slab 3 may be laid and the main pavement 6 may be applied. In this case, the traffic release time zone can be secured every time the third step is completed.

The combination of processes performed within the lane regulation time zone as described above does not have to be the same every time. For example, the first step is carried out within the preceding lane regulation time zone, the second step and the third step are continuously carried out within the following lane regulation time zone, and then the next lane regulation time. In the band, the first step to the third step may be continuously carried out.

By the way, when the process to be carried out within one lane regulation time zone is up to the first step or the second step, the main girder 2 after removing the existing floor slab piece 11 is exposed. It is in the state of being done. Therefore, in this case, the work of installing the temporary lining plate 7 and the work of applying the temporary lining 9 and the temporary pavement 8 are performed on the main girder 2 immediately before the traffic release period is reached. As a result, when the traffic release time zone arrives, the traffic can be released even if the construction is interrupted.

On the other hand, if the third step is carried out within one lane regulation time zone, the new floor slab 3 is made of paved concrete 51 on the main girder 2 after removing the existing floor slab piece 11. It is installed with a packing process and a main pavement 6. Therefore, in this case, even if the temporary floor slab 7 is not provided, the traffic release can be carried out as it is when the traffic release time zone arrives.

≪Temporary lining floor slab≫
As shown in FIG. 6A, the temporary lining floor slab 7 that allows vehicles to pass is located on the traveling lane side of the cross section of the bridge B1 divided into two halves, the traveling lane side and the overtaking lane side. It is a member capable of temporarily covering a half-section, and integrally forms a deck main body 71, a ground cover 72, and a balustrade 73. By doing so, the time required for the installation work of the temporary lining floor slab 7 can be significantly shortened, but the floor slab main body 71, the ground covering 72, and the balustrade 73 may be manufactured separately and assembled on site.

Further, as shown in FIG. 6B, the floor slab main body 71 of the temporary lining floor slab 7 is provided with temporary pavement 8 in advance on the upper surface excluding the vicinity of the outer edge portion, and the bridge axial length L2 is shown in FIG. It is formed to be substantially the same as the bridge axial length L1 of the existing deck piece 11 shown in 1 (b). However, the present invention is not limited to this, and two types, for example, 1/2 and 1/4, which are smaller than the bridge axial length L1 of the existing deck piece 11, may be prepared.

If two types of bridge axial length L2 are prepared, 1/2 and 1/4, the existing floor even if it becomes necessary to change the bridge axial length L1 of the existing deck piece 11 during construction. The temporary lining floor slab 7 can be easily installed on the main girder 2 exposed after the slab 11 is removed. That is, when the removed existing floor slab 11 has a predetermined bridge axial length L1, only the required quantity of the temporary lining deck 7 having a bridge axial length L2 of 1/2 is used. Arrange in parallel.

On the other hand, when the existing floor slab piece 11 is created by cutting the work section D1, the planned cutting position and the position where the splicing plate is installed on the upper surface of the upper flange at the longitudinal connection portion between the main girders 2. If they overlap, the cutting position must be staggered to avoid the splicing plate. Then, the bridge axial length L1 of the existing deck piece 11 does not have a predetermined length, and the bridge axial length of the main girder 2 exposed after the existing deck piece 11 is removed also changes. However, by using a temporary lining floor slab 7 having a length L2 in the bridge axis direction of 1/2 and 1/4 as appropriate, it is possible to deal with these problems.

Further, the temporary lining floor slab 7 may be installed directly on the upper surface of the upper flange of the main girder 2 according to the thickness of the member, or as shown in FIG. 6A, the height is adjusted by processing a steel material or the like. It may be installed via the material 74. When installing via the height adjusting material 74, the height adjusting material 74 is installed in advance on the lower surface of the floor slab main body 71, and the height adjusting material 74 and the upper flange of the main girder 2 are sandwiched by a clamp or the like. The temporary lining floor slab 7 can be easily detachably fixed to the main girder 2.

Further, in the case of direct installation, the lower surface shape of the floor slab main body 71 is processed so that it can be placed on a flat one and on a splicing plate installed on the upper surface of the main girder 2. It's a good idea to prepare two types of things.

≪New floor version≫
On the other hand, as shown in FIGS. 7 (a) and 7 (b), the newly installed floor slab 3 made of precast concrete includes a floor slab main body 31, a ground cover 32, a joint reinforcing bar 33, and a stud gibber insertion hole 34. The ground cover 32 may be manufactured integrally, or may be manufactured separately and installed on the floor slab main body 31 together with the balustrade (not shown).

The joint reinforcing bars 33 are installed so as to project in parallel from each of the three side surfaces of the floor slab main body 31 facing the bridge axis direction and the side surface facing the existing floor slab 1 on the overtaking lane side. These are arranged in two rows in the height direction, and are staggered in a plan view at the horizontal joint J1 extending in the direction perpendicular to the bridge axis and the vertical joint J2 extending in the direction of the bridge axis. It is buried in the padded concrete 51 placed in the horizontal joint portion J1 and the vertical joint portion J2.

The stud gibber insertion hole 34 formed in the floor slab main body 31 is in a position where the stud gibber 21 can be inserted when the new floor slab 3 is placed on the upper surface of the upper flange of the main girder 2, and the new floor slab 3 is formed. The non-shrink mortar 4 is filled through the stud gibber insertion hole 34 when the main girder 2 is joined.

≪≪Bridge floor slab replacement method≫≫
Next, the procedure of the floor slab replacement method for replacing the existing floor slab 1 in the work area D1 with the new floor slab 3 made of precast concrete while alternately repeating the lane regulation time zone and the traffic release time zone will be described below. do.

In this embodiment, after the first step is carried out in the first lane regulation time zone, the second step and the third step are carried out in the second lane regulation time zone after the end of the traffic release time zone. Is continuously carried out, and one cycle is completed by repeating this (replacement of the work section D1 with the new floor slab 3) as an example. Further, as an example, the temporary lining floor slab 7 and the new floor slab 3 to be used have the same or substantially smaller lengths L2 and L3 in the bridge axis direction as the existing floor slab piece 11. explain.

<Preparatory work to be carried out each time the lane regulation time zone arrives>
As shown in FIG. 1 (b), every time the lane regulation time zone arrives, lane regulation is performed so that the two upstream lanes of the bridge B1 are one lane, and the floor slab erection device 10 is carried in at the time of construction planning in advance. This deck erection device 10 is installed in the vicinity of the work section D1 set as one cycle of the deck replacement method.

≪Floor slab erection device≫
As the floor slab erection device 10, any device may be used as long as it is a device conventionally used for the replacement work of the existing floor slab 1, but this implementation is carried out in consideration of repeating loading and unloading every lane regulation time zone. In this form, a gate-type floor slab erection device 10 manufactured so as to be able to be loaded on the loading platform of a vehicle such as a trailer is adopted.

As shown in FIGS. 1 (b) and 8 (a), the deck slab erection device 10 includes a pair of gantry frames 101 arranged at intervals and a pair of cranes spanned over the gantry frames 101. A garter 102 and an overhead crane 103 suspended from each of the crane garter 102 are provided. The overhead crane 103 has a structure that can be moved along the crane garter 102, and the work related to the removal of the existing floor slab 1, the installation or removal of the temporary lining floor slab 7, and the installation of the new floor slab 3 are performed. All are done using this overhead crane 103.

<Preceding work to be carried out before the first process>
As described above, the existing floor slab 1 of the work section D1 set as one cycle is provided with seven cutting lines along the direction orthogonal to the bridge axis as shown in FIG. 1 (b), and six existing floors are provided. A plate 11 is created (Step 1). It is desirable that the cutting intervals are equal, but if the position of the cutting line matches the position of the splicing plate installed on the upper surface of the upper flange of the main girder 2, the cutting position should be set so as to avoid the splicing plate. Change as appropriate.

<The arrival of the first lane regulation time zone: the first process>
As shown in FIG. 8A, the floor slab erection device 10 is installed at a predetermined position in the vicinity of the work section D1. Next, of the six existing floor slabs 11, the first piece (the rightmost end in FIG. 1 (b)) located on the upstream side of the up two lanes is separated from the existing floor slab 1 in the work section D1. After making a cutting line at the boundary line along the bridge axis direction, the existing deck piece 11 is lifted and removed by the deck erection device 10.

This work is performed twice in succession, and as shown in FIG. 5A, the two existing deck pieces 11 are removed. Next, using the space formed by removing the two existing floor slab pieces 11, a work scaffold 22 as shown in FIG. 8B is installed at a necessary place between the main girders 2 (). Step 2).

After that, the work scaffold 22 is used to prepare the upper surface of the upper flange of the main girder 2. As the pretreatment, for example, the work of scraping off the remnants of the existing floor slab piece 11 from which the concrete debris and the anchor reinforcing bars adhering to the upper surface of the upper flange of the main girder 2 have been removed, and the work of installing the stud gibber 21 later. Perform so-called chipping work such as adjusting the substrate (Step 3).

After these operations are completed, as shown in FIG. 8B, the above-mentioned temporary lining floor slab 7 is installed on the upper surface of the upper flange of the main girder 2 via the height adjusting material 74. As shown in FIG. 9A, with respect to the adjacent temporary lining floor slab 7 and the horizontal joint portion J1 formed between the existing floor slab 1 or the existing floor slab piece 11 and the temporary lining floor slab 7. The temporary filling 9 is performed.

In the temporary filling 9, an opening closing plate 91 such as an iron plate is installed so as to close the lower surface side of the horizontal joint portion J1, and then a filler 92 such as sponge or sand is filled. Further, when the opening of the horizontal joint portion J1 is large, it is advisable to install the opening closing plate 91 on the upper surface as well. When the opening closing plate 91 is arranged so as to close the upper surface of the horizontal joint portion J1, the horizontal joint portion J1 does not necessarily have to be filled with the filler 92.

Specifically, as shown in FIG. 9B, a pair of opening closing plates 91 close the upper surface side and the lower surface side of the horizontal joint portion J1 so as to sandwich the temporary lining floor slab 7. The opening closing plate 91 is fastened with a binding tool 93 such as a bolt. At this time, if the opening closing plate 91 on the upper surface side is fixed to the temporary lining floor slab 7 in a state where the entire surface of the horizontal joint portion J1 is closed, the opening closing plate 91 on the lower surface side is shown in FIG. 9 (c). As shown in FIG. 9D, the entire surface of the lower surface side of the horizontal joint portion J1 may be closed, or as shown in FIG. 9D, it may be arranged so as to cover a part of the lower surface side. ..

By doing so, the workability can be significantly improved and the construction period can be shortened as compared with the case where the filler 92 is filled in the horizontal joint portion J1. Such processing is similarly performed not only on the horizontal joint portion J1 but also on the vertical joint portion J2 formed between the temporary lining floor slab 7 and the existing floor slab 1 on the overtaking lane side.

Next, the temporary pavement 8 is applied to the entire upper surface of the temporary lining floor slab 7. As described above, since the preceding temporary pavement 81 is preliminarily applied to the upper surface of the temporary lining floor slab 7, the horizontal joint is applied to the edge of the temporary lining floor slab 7 to which the preceding temporary pavement 81 is not applied. The trailing temporary pavement 82 may be applied so as to cover the portion J1 and the vertical joint portion J2. In this way, if the preceding temporary pavement 81 is previously applied to the upper surface of the temporary lining floor slab 7, the working time of the entire temporary pavement 8 can be significantly shortened. After that, the gate-type floor slab erection device 10 is carried out to complete the first step, and the two up lanes are set to be in a state where the vehicle can be released.

<The arrival of the second lane regulation time zone: the second process and the third process>
Similar to the start of the first step, the deck erection device 10 is installed at a predetermined position in the vicinity of the work section D1. Next, the temporary lining floor slab 7 installed on the upper surface of the upper flange of the main girder 2 is temporarily removed by the floor slab erection device 10, the cleaning status of the upper surface of the upper flange of the main girder 2 is confirmed, and if necessary, it is performed again. Perform the cleaning work and adjust the substrate.

After that, the second step is carried out. That is, as shown in FIG. 10, a plurality of stud gibber 21 are installed on the upper surface of the upper flange of the main girder 2 at predetermined intervals, and rust preventive coating is applied (Step 4). A plurality of stud gibber 21 arranged in the direction orthogonal to the bridge axis are set as a set, and a plurality of stud gibber 21 are installed at intervals in the bridge axis direction. FIG. 10 illustrates a case where three stud gibber 21 are installed in the direction orthogonal to the bridge axis, but the quantity thereof is appropriately changed according to the width of the main girder 2, the position of the span, and the like.

After these operations are completed, the third step is carried out. First, the new floor slab 3 is installed on the upper surface of the upper flange of the main girder 2 using the floor slab erection device 10 (Step 5). As shown in FIG. 11A, the new floor slab 3 is arranged so that the stud gibber 21 installed on the upper surface of the upper flange of the main girder 2 is housed in the stud gibber insertion hole 34, and the stud gibber insertion hole 34 is accommodated. Is filled with non-shrink mortar 4 to firmly join the main girder 2 and the new floor slab 3 (Step 6). Before installing the new floor slab 3, mortar stoppers 41 are installed on both sides of the upper flange of the main girder 2.

Before or at the same time as the filling work of the non-shrink mortar 4, as shown in FIG. 11B, the work (Step 7) of joining the adjacent new floor slabs 3 by the main plate 52 is carried out.

The main plate 52 is installed so as to straddle the upper part of the horizontal joint portion J1 formed between the adjacent new floor slabs 3. The main plate 52 is made of the same material as the padded concrete 51 and has a sufficient width to cover the horizontal joint portion J1 and a length substantially equal to the length L3 in the direction perpendicular to the bridge axis of the deck main body 31 at the factory. The manufactured precast concrete board is used.

The installation method of the main plate 52 may be carried out by any means such as fixing with an anchor or an adhesive, and the installation state is also such that the main plate 52 is placed on the upper surface of the floor slab main body 31. However, in the present embodiment, the floor slab is placed in a notch provided at the edge of the main body 31. At this time, the notch may be formed at a depth such that the upper surface of the main plate 52 and the upper surface of the deck main body 31 are flush with each other.

Next, as shown in FIG. 11 (c), the main pavement 6 is applied to the upper surface of the new floor slab 3 (Step 8). Further, at the same time as or before and after the work related to the main pavement 6, the formwork 53 is installed below the horizontal joint portion J1 so as to straddle the horizontal joint portion J1. Filling holes, air holes, or filling confirmation holes (not shown in any of them) for filling the padded concrete 51 are formed in the formwork 53.

Then, as shown in FIG. 11D, the padded concrete 51 is filled from the lower surface side of the horizontal joint portion J1 and the joint reinforcing bar 33 is embedded (Step 9). As the padded concrete 51, any concrete may be used as long as it is a high-strength and highly durable concrete.

As described above, when the main plate 52 is manufactured of the same material as the padded concrete 51, it can be handled as a main member capable of functioning as a part of the new floor board. For this reason, if the upper part of the horizontal joint portion J1 is covered with the main plate 52, the work of applying the main pavement 6 immediately after that can be preferentially carried out. It is also possible to carry out the filling work of the concrete 51. By doing so, it is possible to reduce the work to be carried out during the lane regulation time zone, and it is possible to greatly improve the work efficiency.

The vertical joint portion J2 and the existing floor slab 1 or the horizontal joint portion J1 formed between the existing floor slab piece 11 and the new floor slab 3 are shown in the first step before the main pavement 6 is applied. As described above, the temporary filling 9 is performed by the opening closing plate 91 and the filler 92. After that, the floor slab erection device 10 is carried out to complete the third step, and the two up lanes are set to be in a state where the vehicle can be released.

As described above, when the second lane regulation time zone is completed, the first and second existing floor slabs on the upstream side of the up two lanes in the work section D1 are subjected to the first to third steps. The work of replacing the piece 11 with the new floor slab 3 is completed. In addition, at any stage of the third step, a high-level inspection is installed on the ground cover 32 of the new floor slab 3.

By the way, as shown in FIG. 11D, in the third step, the main pavement 6 is applied to the entire surface of the two new floor slabs 3. Therefore, when the third and fourth existing floor slabs 11 located in the middle portion of the work section D1 are replaced with the new floor slab 3, the following processing is added.

As shown in FIG. 12 (a), regarding the second new floor slab 3 already covered with the main pavement 6, the vicinity of the edge adjacent to the third new floor slab 3 not covered with the main pavement 6. Peel off the main pavement 6 by a predetermined width. Then, as shown in FIG. 12B, the main plate 52 is installed across the horizontal joint portion J1 formed between the second and third new floor slabs 3, and then the main pavement is installed. 6 is applied, and as shown in FIG. 12 (c), the padded concrete 51 is filled.

As described above, in the case of the first step, the step carried out immediately before the traffic release time zone is that the temporary lining floor slab 7 is laid at the end and the joints are processed by the temporary filling 9. Further, in the case of the third step, the lining floor slab 3 is laid at the end, the joints are treated with the padding 51, and the main pavement 6 is applied. As a result, no matter which process the work is completed in the lane regulation time zone, the vehicle is in a state where the vehicle can pass during the traffic release time zone. Therefore, the existing floor slab 11 is used while repeating the traffic release. It is possible to efficiently carry out the work of replacing with the new floor slab 3.

By repeating the preceding lane regulation time zone in which the first step is carried out and the subsequent lane regulation time zone in which the second step and the third step are carried out three times in the above procedure, that is, six times. After the lane regulation time zone, the work section D1 can be replaced with the new floor slab 3, which completes the work for one cycle.

<The arrival of the lane regulation time zone after the 7th time: 2nd cycle>
Next, as shown in FIG. 3C, the floor slab replacement method is carried out according to the above procedure for the work section O1 in the overtaking lane of the first section parallel to the work section D1.

That is, in the work section O1 of the overtaking lane, the step of creating the existing floor slab piece 11 (Step 1) is completed as the preceding work, and then the first to third steps are repeated three times. In this way, as shown in FIG. 3D, the existing floor slab 1 in the work section D1 and the work section B1 in the first section of the plurality of sections set in the bridge B1 is replaced with the new floor slab 3. The replacement method is completed.

<Lane regulation time zone that arrives after the floor slab replacement method for work area O1 is completed>
Returning to the flow chart of FIG. 2 (fourth step), as shown in FIG. 3D, the new floor slab 3 of the work section D1 on the traveling lane side and the new floor slab 3 of the work section O1 on the overtaking lane side. To join.

As shown in FIG. 13A, the joining work is performed on the edge adjacent to the vertical joint portion J2 formed between the new floor slab 3 of the work section D1 and the new floor slab 3 of the work section O1 on the overtaking lane side. After peeling off the main pavement 6 of the portion by a predetermined width, the main plate 52 is installed in the notch formed at the edge of the new floor slab 3 so as to straddle the upper part of the vertical joint portion J2. The main plate 52 has a sufficient width to cover the vertical joint portion J2, and its length is formed to be substantially equal to the length of the work section D1 and the work section O1 in the bridge axial direction.

The material of the main plate 52 is the same as that used when covering the horizontal joint portion J1, and the installation direction of the new floor slab 3 is also when the horizontal joint portion J1 is installed. It is the same as the method of.

Finally, as shown in FIGS. 13 (b) and 13 (c), the main pavement 6 is applied and the padded concrete 51 is filled. As a result, the floor slab replacement work of the first section of the bridge B1 divided in the bridge axis direction is completed.

After that, the process returns to the second step of the flow chart of FIG. 2, and the same construction is repeatedly performed for all the sections after the second section set on the bridge B1 according to the above procedure (fifth step).

As a result, the construction of replacing all the existing floor slabs 1 in the planned construction area (1st section, 2nd section, 3rd section, ...) In the bridge B1 with the new floor slab 3 is completed. The order in which the above-mentioned half-section floor slab replacement method is carried out on the traveling lane side and the overtaking lane side is not limited to the above procedure.

That is, in the present embodiment, as shown in FIG. 14A, the work section D1 of the first section is replaced with the new floor slab 3, and then the work section O1 parallel to the work section O1 is replaced with the new floor slab 3. After that, the work section D2 of the second section is replaced with the new floor slab 3, and the work section O2 parallel to this is replaced with the new floor slab 3. This work will be repeated.

However, it is not limited to this procedure. For example, as shown in FIG. 14B, after the work section D1 of the first section is replaced with the new floor slab 3, the work section O1 parallel to the work section O1 is replaced with the new floor slab 3. After that, the work section O2 of the second section is replaced with the new floor slab 3, and the work section D2 parallel to the work section D2 is replaced with the new floor slab 3. A procedure such as repeating this work may be adopted.

As described above, the replacement method of the existing floor slab can be applied to the site conditions and construction conditions (for example, keren work and stud gibber 21) in a series of work from the first step to the third step as shown in FIG. Depending on the progress of the installation work, etc.), the stage at which the work is interrupted can be selected as appropriate. As a result, it is possible to adjust the progress of the work process to be carried out within one construction traffic regulation time zone while preparing for the arrival of the traffic release time zone, and it is possible to efficiently carry out the replacement work of the new floor slab 3. ..

Therefore, by setting the lane regulation time zone at night, it is possible to replace the existing floor slab 1 with the new floor slab 3 while realizing the daytime traffic release. This will affect the traffic environment in the surrounding area even if the road bridge B for which the existing floor slab replacement work is to be carried out on a heavy traffic road such as an urban area or in a mountainous area sandwiched between long tunnels. It is possible to carry out the construction while minimizing the problem.

Further, by forming the cross section of the existing deck piece 11 as viewed from the bridge axis direction into a half cross section obtained by dividing the cross section of the existing deck 1 in half, the bridge B1 for the up two lanes and the down two lanes are formed in the daytime. By the half-section deck replacement method in which both of the bridges B2 for use are released from traffic and the lanes are restricted only to the bridge B1 for two lanes at night, the replacement work of the existing deck 1 in the bridge B1 can be carried out.

Therefore, it is not necessary to make one of the bridges B1 and B2 for the up lane and the bridges B1 and B2 for the down lane constituting the road bridge B completely closed, and to restrict the other to the two-way traffic. In addition to ensuring safety, it is not possible to implement face-to-face traffic restrictions due to road structure, etc., or even if it is possible, long-term traffic restrictions are difficult depending on the traffic conditions in the surrounding area. Even in a road environment with various problems, it is possible to reliably carry out replacement work for the existing floor slab 1.

The floor slab replacement method for bridges of the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention.

For example, in the present embodiment, by using the main plate 52, the pavement concrete 51 is placed on the horizontal joint portion J1 and the vertical joint portion J2 formed between the adjacent new floor slabs 3. The main pavement 6 can be carried out before this is done. Therefore, it was decided to carry out Steps 5 to 9 in the third step, but when the main plate 52 is not used, the third step may be divided into two steps.

In this case, in the third first half step, the step of filling the non-shrink mortar 4 from the installation of the new floor slab 3 (Steps 5 and 6) is carried out. Further, in the third latter half step, the horizontal joint portion J1 of the adjacent new floor slab 3 is filled with the padded concrete 51 (Step 9), and then the main pavement 6 is applied (Step 8). Then, the third first half process is performed when the third lane regulation time zone arrives, and the third second half process is performed when the fourth lane regulation time zone arrives.

In the third first half step, after filling the non-shrink mortar 4 with Step 6, as shown in FIG. 15A, a temporary space is formed in the horizontal joint portion J1 formed between the adjacent new floor slabs 3. Filling 9 is performed, and temporary pavement 8 is temporarily applied to the entire upper surface of the new floor slab 3.

Then, in the third second half step, the temporary pavement 8 provided on the upper surface of the new floor slab 3 is peeled off, and the temporary filling 9 of the horizontal joint portion J1 formed between the adjacent new floor slab 3 is removed. A formwork 53 is installed on the bottom surface of the horizontal joint portion J1, and the padded concrete 51 is filled and cured from above the horizontal joint portion J1 to perform the main filling 5.

After the curing for a predetermined time is completed, as shown in FIG. 13B, the main pavement 6 is applied to the entire upper surface of the new floor slab 3. The vertical joint portion J2 and the horizontal joint portion J1 formed between the existing floor slab 1 or the existing floor slab piece 11 and the new floor slab 3 are the temporary pavement 9 performed in the third first half step. It may be left behind and the main pavement 6 may be applied from the upper surface thereof.

1 Existing floor slab 11 Existing floor slab piece 2 Main girder 21 Stud gibber 22 Work scaffold 3 New floor slab 31 Floor slab body 32 Ground cover 33 Joint reinforcement 34 Stud gibber insertion hole 4 Non-shrink mortar 41 Mortal stopper 5 Main pavement 51 Filling concrete 52 Main plate 53 Form frame 6 Main pavement 7 Temporary lining Deck 71 Floor slab body 72 Ground covering 73 Gauge 74 Height adjustment material 8 Temporary pavement 81 Preceding temporary pavement 82 Subsequent temporary pavement 9 Temporary pavement 91 Opening closing plate 92 Filling material 93 Fastener 10 Deck erection device

J1 Horizontal joint J2 Vertical joint B Road bridge B1 Bridge (up 2 lanes)
B2 bridge (2 lanes down)

Claims (5)

It is a bridge deck replacement method that replaces the existing deck installed on the steel main girder with a new precast concrete deck while alternately repeating the construction traffic regulation time zone and the traffic release time zone.
The first step of removing at least a part of the existing deck pieces formed by dividing the existing deck of the bridge in the direction of the bridge axis to expose the main girder.
A second step of installing a stud girder on the upper surface of the main girder exposed in the first step, and
A plurality of the new floor slabs are installed on the main girder on which the stud girder is installed in the second step, the new floor slabs are joined to the main girder, and then adjacent new floor slabs are joined. With 3 steps,
The first step to the third step include the case where the steps are carried out during the construction traffic regulation time zone and two or more steps are continuously carried out within the construction traffic regulation time zone once. ,
When the first step or the second step is carried out immediately before the traffic release time zone arrives, a temporary lining deck is installed on the main girder which is exposed at the end of the work. The floor slab replacement method for bridges, which is characterized by this. In the deck replacement method for bridges according to claim 1,
A bridge deck replacement method, characterized in that the first step to the third step are repeated in the direction of the bridge axis each time the construction traffic regulation time zone arrives. In the bridge deck replacement method according to claim 1 or 2,
A bridge deck replacement method, characterized in that the cross section of the existing deck piece seen from the bridge axis direction is formed into a half cross section obtained by dividing the cross section of the existing deck in half. In the bridge deck replacement method according to any one of claims 1 to 3,
In the third step
A bridge slab replacement method characterized by joining adjacent new floor slabs with a main plate that functions as a part of the new floor slab. In the bridge deck replacement method according to any one of claims 1 to 4,
After installing the temporary lining floor slab on the main girder,
A method for replacing a floor slab of a bridge, characterized in that the upper and lower surfaces of joints adjacent to the temporary lining floor slab are covered with opening closing plates, and the opening closing plates are fastened to each other via fasteners.

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