JP2022033346A - Slab replacement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slab replacement method with which slabs can be replaced efficiently.

SOLUTION: A slab replacement method includes an existing slab removal step, a new slab placement preparation step, and a new slab placement step. The existing slab removal step includes removal of slab pieces of existing slabs. The new slab placement preparation step includes preparatory work for arranging new slabs on a bridge girder from which slab pieces have been removed. The new slab placement step includes arranging the new slabs on the bridge girder on which the preparatory work has been performed. In the order of direction to move the work forward, there are in a line a first work area where the existing slab removal step is carried out, a second work area where the new slab placement preparation step is carried out, and a third work area where the new slab placement step is carried out. A first crane device used in the existing slab removal step is located on the existing slabs on the bridge girder. A second crane device used in the new slab placement step is located on the slabs newly placed on the bridge girder.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a method for replacing a floor slab constituting a structure such as a bridge (removal of an existing floor slab and installation of a new floor slab in place of the existing floor slab).

The bridge is arranged, for example, over a plurality of piers, a plurality of bridge girders (H-shaped steel) each straddling a plurality of piers and extending in the direction of the bridge axis, and a plurality of bridge girders. It is composed of a floor slab and a floor slab. The deck is made of, for example, reinforced concrete. For such decks, replacement (removal of existing decks and installation of new decks) may be required due to deterioration of concrete due to long-term use and corrosion of internal reinforcing bars.

As a device used for replacing the deck, for example, the deck erection machine described in Patent Document 1 is known. This is a non-railway, self-propelled gantry structure that connects the gantry frames before and after the bridge axis direction, and is provided on the lower surface side of the ceiling of the gantry structure so that it can be moved in the front-rear direction and the lateral direction. It is equipped with a lifting device (for example, a chain block). Here, the new floor slab is made of precast concrete.

The work of erection of a new floor slab using such an erection machine is
(1) Taking in the new deck at the rear of the erection machine, that is, the new deck with the long side of the new deck facing the bridge axis direction by the lifting device located at the rear of the erection machine. (2) Transfer of the new deck to the erection position by moving it to the front side of the lifting device (3) Changing the orientation of the new deck so that the long side of the new deck faces in the direction perpendicular to the bridge axis. (Rotation 90 °)
(4) Then, it is performed in the process of installing in a predetermined position.
In addition, the work of removing the existing floor slab is replaced and performed in almost the reverse process.

Japanese Patent No. 3901657

However, in the floor slab replacement method using the above-mentioned erection machine, the above-mentioned erection machine moves in the direction of the bridge axis after the existing floor slab is removed and the new floor slab is installed at a certain construction site, and the following From the removal of the existing floor slab to the installation of the new floor slab at the construction site. Therefore, until the floor slab replacement work at one construction site is completed, the floor slab replacement work cannot be started at the next construction site, and as a result, the floor slab replacement work is performed over the entire length of the bridge. There was a problem that it took time to do.

In view of such an actual situation, it is an object of the present invention to provide a floor slab replacement method capable of efficiently replacing a deck in a structure such as a bridge.

Therefore, the first to eighth aspects of the floor slab replacement method according to the present invention are methods for replacing the floor slab arranged on the bridge girder from the existing floor slab to the new floor slab in the structure having the bridge girder. The first to eighth aspects of the floor slab replacement method according to the present invention include setting a plurality of construction areas by dividing them into a plurality of construction areas in the axial direction of the structure, and include an existing deck slab removal step. , A new deck placement preparation process, and a new deck placement process, the existing deck removal process includes removing the deck piece of the existing deck, and the new deck placement preparation step is a deck piece. The new deck placement step includes placing the new deck on the bridge girder on which the preparatory work has been performed. In the first to eighth aspects of the floor slab replacement method according to the present invention, the existing floor slab removal step is carried out in order from the front side to the rear side in the traveling direction in the floor slab replacement construction progress direction along the axial direction. First construction area to be carried out, second construction area to carry out the new deck placement preparation process when the existing deck removal process is carried out in the first construction area, and new deck placement in the second construction area. There is a third construction area where the new floor slab placement process is carried out when the preparatory process is carried out. In the first to eighth aspects of the deck replacement method according to the present invention, the first crane device used in the existing deck removal step is located on the existing deck on the bridge girder, and is newly installed on the bridge girder. The second crane device used in the new deck placement process is located on the deck.
In the first aspect of the floor slab replacement method according to the present invention, the first crane device includes a pair of lower frames extending in the axial direction, a portal frame having a lower end connected to the pair of lower frames, and a portal frame. It includes an upper frame provided on the upper part and a lifting device that can move axially with respect to the upper frame.
In the second aspect of the floor slab replacement method according to the present invention, the first crane device includes a pair of lower frames extending in the axial direction, a portal frame having a lower end connected to the pair of lower frames, and a lifting device. , And the pair of lower frames are provided with rollable wheels.
In the third aspect of the floor slab replacement method according to the present invention, the first crane device includes a pair of lower frames extending in the axial direction, a portal frame having a lower end connected to the pair of lower frames, and a lifting device. , And transport vehicles carrying deck pieces may be placed within the portal frame and between a pair of lower frames.
In the fourth aspect of the floor slab replacement method according to the present invention, the second crane device includes a pair of lower frames extending in the axial direction, a portal frame having a lower end connected to the pair of lower frames, and a portal frame. It includes an upper frame provided on the upper part and a lifting device that can move axially with respect to the upper frame.
In the fifth aspect of the floor slab replacement method according to the present invention, the second crane device includes a pair of lower frames extending in the axial direction, a portal frame having a lower end connected to the pair of lower frames, and a lifting device. , And the pair of lower frames are provided with rollable wheels.
In the sixth aspect of the floor slab replacement method according to the present invention, the second crane device includes a pair of lower frames extending in the axial direction, a portal frame having a lower end connected to the pair of lower frames, and a lifting device. , And a transport crane for transporting the new deck can travel within the portal frame and between the pair of lower frames.
In the seventh aspect of the floor slab replacement method according to the present invention, the axial length of the second construction area is longer than the axial length of the floor slab piece.
In the eighth aspect of the floor slab replacement method according to the present invention, the axial length of the second construction area is longer than the axial length of the new floor slab.

According to the present invention, it is possible to proceed with the construction in parallel (that is, at the same time) in a plurality of construction areas where the progress of the floor slab replacement construction is different, so that the floor slab replacement can be efficiently (in other words, in other words). Can be done in a short period of time).

Side view of an example of an existing bridge Side view which shows the construction state of the floor slab replacement method in 1st Embodiment of this invention. A flowchart showing the main routine of the floor slab replacement method in the first embodiment. A flowchart showing a subroutine of the floor slab replacement method in the first embodiment. A flowchart showing a method of removing the existing floor slab in the first embodiment. A flowchart showing a method of preparing for placement of a new floor slab in the first embodiment. A flowchart showing a method of arranging a new floor slab in the first embodiment. The figure which shows the cutting method of the existing floor slab in the said 1st Embodiment The figure which shows the cutting method of the existing floor slab in the said 1st Embodiment The figure which shows the edge cutting method of the existing floor slab in the said 1st Embodiment. The figure which shows the edge cutting method of the existing floor slab in the said 1st Embodiment. The figure which shows the arrangement preparation method of the new floor slab in the said 1st Embodiment The figure which shows the arrangement preparation method of the new floor slab in the said 1st Embodiment The figure which shows the arrangement preparation method of the new floor slab in the said 1st Embodiment The figure which shows the arrangement method of the new floor slab in the said 1st Embodiment The figure which shows the arrangement method of the new floor slab in the said 1st Embodiment The figure which shows the installation method of the stud gibber in the said 1st Embodiment The figure which shows the relationship between the time in the 1st Embodiment and the work process of each construction area. The figure which shows the relationship between the time in the 1st Embodiment and the work process of each construction area. The figure which shows the relationship between the time and the work process of each construction area in an example of the conventional floor slab replacement method. The figure which shows the relationship between the time and the work process of each construction area in 2nd Embodiment of this invention. The figure which shows the relationship between the time in the 2nd Embodiment and the work process of each construction area. A flowchart showing a method of arranging a new floor slab in a third embodiment of the present invention. A flowchart showing a method of preparing for placement of a new floor slab according to a fourth embodiment of the present invention. A flowchart showing a method of arranging a new floor slab in the fifth embodiment of the present invention. A flowchart showing a method of preparing for placement of a new floor slab according to a sixth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same or corresponding parts are designated by the same reference numerals.

FIG. 1 is a side view of an example of an existing bridge to which the floor slab replacement method according to the present invention can be applied. FIG. 2 is a side view showing a construction state of the floor slab replacement method according to the first embodiment of the present invention. In this embodiment, the front and back are defined as shown in FIGS. 1 and 2 with the traveling direction of the floor slab replacement work on the bridge as the forward direction, and the following description will be made. Here, the direction of progress of the floor slab replacement work is along the bridge axis direction of the bridge. Further, in the present embodiment, the direction perpendicular to the bridge axis of the bridge is defined as the left-right direction (lateral direction), which will be described below (see FIGS. 10A to 12).

In the present embodiment, a bridge will be described as an example of the "structure" (civil engineering structure) of the present invention, but the "structure" of the present invention is not limited to the bridge. Further, the above-mentioned bridge axial direction may correspond to the "axial direction of the structure" and the "axial direction of the bridge" of the present invention.

The bridge 1 which is an example of the "structure" of the present invention includes a pair of front and rear abutments 2a and 2b, a plurality of piers 3 arranged at intervals between the abutments 2a and 2b, and the abutments 2a and 2b, respectively. A plurality of bridge girders (H-shaped steel) 4 extending in the direction of the bridge axis straddling the plurality of piers 3, and an existing concrete deck 5 straddling the plurality of bridge girders 4. And are configured to include. A bearing (not shown) is interposed between the abutments 2a and 2b, the plurality of piers 3, and the plurality of bridge girders 4. Here, in the present embodiment, the existing floor slab 5 will be described below as being made of reinforced concrete (RC floor slab), but in addition, the existing floor slab 5 may be made of prestressed concrete (PC floor). It may be a version). Further, the bridge girder 4 has a web 4w, an upper flange 4f, and a lower flange (not shown), as shown in FIGS. 10A to 10C described later.

In the present embodiment, it will be described below assuming that the total length (bridge length) Lt of the bridge 1 is 300 m, but the total length Lt of the bridge 1 is not limited to 300 m. Further, in the present embodiment, the existing deck 5 is not divided in the direction perpendicular to the bridge axis of the bridge 1, which is described below as a so-called full-section deck replacement construction, but the construction mode is not limited to this, for example, a bridge. It may be a so-called half-section deck replacement construction in which the existing deck 5 is divided into two in the direction perpendicular to the bridge axis of 1.

In addition to FIGS. 1 and 2, FIGS. 3 and 4 will be used to explain the floor slab replacement method in the present embodiment. FIG. 3 is a flowchart showing the main routine of the floor slab replacement method in the present embodiment. FIG. 4 is a flowchart showing a subroutine of the floor slab replacement method in the present embodiment.

The floor slab replacement work of the bridge 1 (removal of the existing floor slab 5 and installation of the new floor slab 7 in place of the existing floor slab 5) generally follows the main routine shown in FIG.

First, in step S101, a plurality of construction areas A1 to _An are set by dividing the bridge ₁ into a plurality of construction areas A1 to _An ( _n in the present embodiment) in the bridge axis direction. In the present embodiment, the length of each of the construction areas A1 to _An in the bridge axis direction will be described below as 6 _m , but the length of each of the construction areas _A1 to _An in the bridge axis direction will be described below. The size is not limited to 6m. For example, when the total length Lt of the bridge 1 is 300 m and the lengths of the construction areas A ₁ to An in the bridge axial direction are 6 m, _n = 300/6 = 50.

Next, in step S102, the existing floor slab 5 is removed and the new floor slab 7 is placed in place of the existing floor slab 5 in _each of the construction areas _A1 to Ann. In the present embodiment, for example, as shown in FIG. 2, the floor slab replacement work can be carried out in parallel in a plurality of construction areas _Ak to _Ak-6 . In this embodiment, in the floor slab replacement construction progress direction, the construction area on the front side (for example, construction area _Ak-4 ) and the construction area behind this construction area (for example, construction area _Ak-6 ) are set. Therefore, different work processes can be carried out in parallel.

When the existing floor slab 5 is removed and the new floor slab 7 is placed in place of the existing floor slab 5 in all of the construction areas _{A 1} to An (that is, when the placement of the new floor slab 7 is completed over the entire length Lt of the bridge 1). ), Proceed to step S103, the new floor slab 7 and the bridge girder 4 are fixed and integrated, and the new floor slabs 7 adjacent to each other in the bridge axis direction are fixed and integrated.
In this way, the floor slab replacement work of the bridge 1 is performed.

With respect to the above-mentioned step _S102 , each of the construction areas A1 to _An has a plurality of work steps from the removal of the existing floor slab 5 to the arrangement of the new floor slab 7. This multi-stage work process is shown in FIG.
As shown in FIG. 4, first, in step S1, the existing floor slab 5 is removed as the first stage (first stage). Here, step S1 corresponds to the "first working step" of the present invention.

Next, in step S2, as the middle stage (second stage), preparatory work for arranging the new floor slab 7 in the construction area where the existing floor slab 5 has been removed (placement preparation work for the new floor slab 7) is carried out. do. Here, step S2 corresponds to the "second working step" of the present invention.

Next, in step S3, as the latter stage (third stage), the new floor slab 7 is placed in the construction area where the placement preparation work for the new floor slab 7 has been carried out. Here, step S3 corresponds to the "third working step" of the present invention.

Here, the work of removing the existing floor slab 5 performed in step S1 will be described with reference to FIGS. 5 and 8A to 9B in addition to FIGS. 1 to 4 described above.
FIG. 5 is a flowchart showing a method of removing the existing floor slab 5 in the present embodiment. 8A and 8B are views showing a cutting method of the existing deck 5 in the present embodiment. 9A and 9B are diagrams showing a method of trimming the existing deck 5 in the present embodiment.

As shown in FIG. 5, first, in step S11, the cutting work of the existing floor slab 5 is carried out. In this step S11, as shown in FIGS. 8A and 8B, a cutting line 5b is set at a position in front of the rear end of the existing deck 5 by a predetermined length La, and a concrete cutter or a concrete cutter is set along the cutting line 5b. The existing deck 5 is cut using a concrete cutting device such as a wire saw to form a deck piece 5a. In the present embodiment, the above-mentioned predetermined length La is 2 m, but the above-mentioned predetermined length La is not limited to 2 m.

Next, in step S12, the edge cutting work of the floor slab piece 5a of the existing floor slab 5 is carried out. In this step S12, first, as shown in FIG. 9A, a plurality of jacks 50a and 50b in a shortened state are installed in front of and behind the deck piece 5a, respectively. Here, the jacks 50a and 50b can be expanded and contracted in the vertical direction, and are, for example, hydraulic jacks.

The lower end of the jack 50a on the front side abuts on the upper surface of the existing deck 5. The lower end of the rear jack 50b abuts on the upper surface 4a of the bridge girder 4 (specifically, the upper surface 4a of the upper flange 4f of the bridge girder 4 shown in FIGS. 10A to 10C).

Further, as shown in FIG. 9A, the beam member 51 is arranged so as to straddle the jacks 50a and 50b. The beam member 51 is fixed to the upper ends of the jacks 50a and 50b. The beam member 51 has a bracket (not shown), and a PC steel rod 52 extending in the vertical direction is arranged so as to penetrate the bracket and the deck piece 5a. The PC steel rod 52 is arranged so as to dodge the bridge girder 4. A beam member 51 (the bracket described above) and fixing members 53a and 53b for fixing the deck piece 5a and the PC steel rod 52 are attached to the upper end portion and the lower end portion of the PC steel rod 52, respectively.

Next, as shown in FIG. 9B, by extending the jacks 50a and 50b, the deck piece 5a is pulled up via the beam member 51 (the bracket described above) and the PC steel rod 52. When the deck piece 5a is separated (edge cut) from the bridge girder 4 in this way, the jacks 50a and 50b are shortened, and the PC steel rod 52, the beam member 51, and the jacks 50a and 50b are removed.

Next, in step S13 of FIG. 5, the deck piece 5a cut off from the bridge girder 4 is lifted by the crane device 20 shown in FIG. 2, and the floor is directed so that the long side of the deck piece 5a faces the bridge axis direction. The plate piece 5a is turned (that is, rotated by 90 °), and the deck piece 5a is placed on the loading platform of a transport vehicle (not shown) by the crane device 20. In this transport vehicle, the floor slab piece 5a can be carried out from the construction areas _A1 to Ann in front of the _floor slab replacement construction progress direction. It should be noted that this transport vehicle can run on the existing floor slab 5.

The crane device 20 includes a pair of left and right lower frames 21 extending in the front-rear direction, a gantry frame 22 having a lower end connected to a pair of left and right lower frames 21, and an upper frame 23 provided above the gantry frame 22. It is configured to include a lifting device 24 that can be moved back and forth and left and right with respect to the upper frame 23. The pair of left and right lower frames 21 are provided with wheels that can roll on the existing floor slab 5. The loading platform of the above-mentioned transport vehicle may be arranged in the gate type frame 22 and between the pair of left and right lower frames 21.

In the present embodiment, the length of one construction area in the bridge axis direction is obtained by performing the above-mentioned steps S11 to S13 three times for each construction area (that is, in _each of the construction areas _A1 to Ann). Remove the existing floor slab 5 for 6 m, which is the minute.
As described above, the work of removing the existing floor slab 5 is carried out in step S1 of FIG.

Next, the arrangement preparation work of the new floor slab 7 carried out in step S2 of FIG. 4 will be described with reference to FIGS. 6 and 10A to 10C in addition to the above-mentioned FIGS. 1 to 4.
FIG. 6 is a flowchart showing a method of preparing the arrangement of the new floor slab 7 in the present embodiment. 10A to 10C are views showing a method of preparing the arrangement of the new floor slab 7 in the present embodiment. Here, FIGS. 10A to 10C correspond to the I-I cross section of FIG. 11A, which will be described later.

As shown in FIG. 6, first, in step S21, the existing floor slab 5 (deck piece 5a) is removed and the upper surface 4a of the bridge girder 4 exposed to the outside (specifically, above the bridge girder 4 shown in FIG. 10A). The cleaning work of the upper surface 4a) of the flange 4f is carried out. Here, the cleaning work may include removing concrete pieces and the like remaining on the upper surface 4a of the bridge girder 4.

Next, in step S22, for example, rubber flange seals 60 are installed on the left and right sides of the upper flange 4f of the bridge girder 4 where the cleaning work has been performed (see FIG. 10B). The flange seal 60 has a plate shape extending in the direction of the bridge axis. The flange seal 60 is struck in the space 9 (see FIG. 11B) between the new floor slab 7 and the bridge girder 4 when the new floor slab 7 and the bridge girder 4 are fixed and integrated in step S103 described above. This is to prevent the installed mortar from leaking out of the space 9.

Next, in step S23, a plurality of height adjusting materials 70 for adjusting the arrangement height of the new floor slab 7 are installed on the upper surface 4a of the upper flange 4f of the bridge girder 4 (see FIG. 10C). The height adjusting material 70 is preferably stretchable in the vertical direction. The height adjusting material 70 may be, for example, a manual jack that can be expanded and contracted in the vertical direction. Alternatively, the height adjusting material 70 may be composed of a member (spacer) having rigidity that cannot be deformed after the height of the height adjusting material 70 is determined. The plurality of height adjusting members 70 are arranged in the bridge axis direction at intervals from each other in the bridge axis direction.

Regarding the height adjusting material 70, when the new floor slab 7 is placed on the bridge girder 4 in step S3 described above and step S31 described later, the height is set to the planned placement height of the new floor slab 7. Prior to the placement of the new floor slab 7 on the bridge girder 4, the height of the height adjusting material 70 itself may be adjusted. The height adjustment of the height adjusting material 70 itself may be performed before installing on the upper surface 4a of the upper flange 4f of the bridge girder 4 in step S23, or after installing on the upper surface 4a of the upper flange 4f of the bridge girder 4. You may go.

In the present embodiment, the height adjusting material 70 is installed after the flange seal 60 is installed, but in addition, the height adjusting material 70 may be installed prior to the installation of the flange seal 60. That is, step S22 and step S23 may be interchanged.
As described above, in step S2 of FIG. 4, the arrangement preparation work of the new floor slab 7 is carried out.

Next, the arrangement work of the new floor slab 7 carried out in step S3 of FIG. 4 will be described with reference to FIGS. 7, 11A, 11B and 12 in addition to the above-mentioned FIGS. 1 to 4.
FIG. 7 is a flowchart showing a method of arranging the new floor slab 7 in the present embodiment. 11A and 11B are diagrams showing a method of arranging the new floor slab 7 in the present embodiment. Here, FIG. 11B corresponds to the I-I cross section of FIG. 11A. FIG. 12 is a diagram showing a method of installing the stud gibber 80.

As shown in FIG. 7, first, in step S31, the new floor slab 7 is placed on a plurality of height adjusting materials 70 installed on the upper surface 4a of the upper flange 4f of the bridge girder 4 (see FIGS. 11A and 11B). ). As a result, a space 9 surrounded by the upper surface 4a of the upper flange 4f of the bridge girder 4, the lower surface 7b of the new deck 7, and the flange seal 60 is formed.

The new deck 7 is made of precast concrete (ie, PCa deck). The new deck 7 has a substantially rectangular shape with the short side in the direction of the bridge axis and the long side in the direction perpendicular to the bridge axis. In the present embodiment, the length of the new deck 7 in the bridge axis direction is 2 m, but the length of the new deck 7 in the bridge axis direction is not limited to 2 m.
The new floor slab 7 is formed with a plurality of through holes 7a so as to face the upper surface 4a of the upper flange 4f of the bridge girder 4.

The crane device 30 shown in FIG. 2 is used for the placement work (mounting work) of the new floor slab 7 in step S31. The crane device 30 includes a pair of left and right lower frames 31 extending in the front-rear direction, a portal frame 32 having a lower end connected to a pair of left and right lower frames 31, and an upper frame 33 provided on the upper portion of the portal frame 32. It is configured to include a lifting device 34 that can be moved back and forth and left and right with respect to the upper frame 33. The pair of left and right lower frames 31 are provided with wheels that can roll on the newly installed floor slab 7 mounted on the bridge girder 4. The transport carriage 40 can travel within the gantry frame 32 and between the pair of left and right lower frames 31.

The new deck 7 to be lifted by the crane device 30 is transported from the ground adjacent to the abutment 2b (see FIG. 1) to the crane device 30 by the transport carriage 40. Even if the running stability of the transport carriage 40 is improved by laying a plate-shaped member such as an iron plate so as to cover the gap between the adjacent new floor slabs 7 placed on the bridge girder 4 from above. good. The transport carriage 40 may be self-propelled. The transport carriage 40 is preferably configured to include wheels with rubber tires.

On the ground adjacent to the abutment 2b, the new floor slab 7 to be transported to the crane device 30 by the transport trolley 40 is unloaded from the transport vehicle (not shown) to the transport trolley 40, which is lighter in weight than the transport vehicle. For this unloading work, a crane device having the same configuration as the above-mentioned crane devices 20 and 30 may be used.
Therefore, in the present embodiment, the newly installed floor slab 7 is carried into the construction areas _A1 to Ann from the rear in the _floor slab replacement construction progress direction.

In the present embodiment, after the new floor slab 7 is lifted from the transport trolley 40 by the crane device 30, the new floor slab 7 is provided so that the long side of the new floor slab 7 is directed in the direction perpendicular to the bridge axis by the crane device 30. Reorient (ie rotate 90 °).

In the present embodiment, by performing the above-mentioned step S31 three times for each construction area (that is, in each of the construction areas _A1 to Ann), the length of _one construction area in the bridge axis direction can be obtained. Arrangement work of a certain 6m (that is, 3 sheets) of new floor slab 7.

Next, in step S32 of FIG. 7, as shown in FIG. 12, a plurality of stud gibber 80s are welded to the upper surface 4a of the upper flange 4f of the bridge girder 4 so as to be located in the through hole 7a of the new deck 7. Fix. If the transport trolley 40 passes during the installation work of the stud gibber 80 in step S32, the installation work of the stud gibber 80 is interrupted when the transport trolley 40 passes.
As described above, the arrangement work of the new floor slab 7 is carried out in step S3 of FIG.

In the construction state at a certain time shown in FIG. 2, the crane device 20 is located in the construction area _{Ak + 1} . In the construction area _Ak located behind the construction area _{Ak + 1} , the work shown in the above-mentioned step S1 (steps S11 to S13) is carried out. In the construction area _Ak -1 located behind the construction area _Ak-1 , the work shown in step S21 described above is carried out. In the construction area _Ak-2 located behind the construction area _Ak-1 , the work shown in step S22 described above is carried out. In the construction area _Ak-3 located behind the construction area _Ak-2 , the work shown in step S23 described above is carried out. In the construction area _Ak-4 located behind the construction area _Ak-3 , the work shown in step S31 described above is carried out. The crane device 30 is located in the construction area _Ak-5 located behind the construction area _Ak-4 . In the construction area _Ak-6 located behind the construction area _Ak-5 , the work shown in step S32 described above is carried out. The reference numeral “α” shown in FIG. 2 indicates that the work is suspended in the middle of the above-mentioned steps S1 to S3 (steps S11 to S32).

In the present embodiment, the construction area where the work of step S1 is performed (for example, the construction area Ak shown in FIG. 2) to the construction area where the work of step _S32 is performed (for example, the construction area A shown in FIG. 2). A temporary tent 10 is provided so as to cover up to _k-6 ). Therefore, the cleaning work in step S21 and the welding work in step S32 are carried out in the temporary tent 10. The construction area covered by the temporary tent 10 is not limited to that shown in FIG.

In this way, in the present embodiment, different work processes are performed in parallel (that is, at the same time) in the construction area on the front side and the construction area behind this construction area in the floor slab replacement construction progress direction. It is possible.
Further, in the present embodiment, in the floor slab replacement construction progress direction, the more from the front side construction area to the rear side construction area (for example, from the construction area _Ak shown in FIG. 2 to the construction area _Ak-6 ). ), It is possible to carry out a plurality of work steps (steps S1 to S32) in parallel (that is, at the same time) so as to be a work step in a subsequent stage (that is, to approach step S32).

In the present embodiment, as shown in FIG. 2, the crane device 20 is located in front of the crane device 30 in the floor slab replacement construction progress direction.

In the present embodiment, the temporary tent 10 and the crane devices 20 and 30 move forward as the floor slab replacement work progresses. Therefore, a deck replacement system capable of performing a plurality of work steps (steps S1 to S32) in parallel (that is, at the same time) is also advanced. Here, this deck replacement system includes a temporary tent 10 and crane devices 20, 30.

FIG. ₁₃ is a diagram showing the relationship between the times t = t1 to t10 and the _respective work processes of the construction areas A1 to A9 in the present embodiment. FIG. 14 is a diagram showing the relationship between the times t = t1 to t15 and the _respective work processes of the construction areas A1 to A8 _in the present embodiment.

The reference numeral “α” shown in FIGS. 13 and 14 indicates that the work is suspended in the middle of the above-mentioned steps S1 to S3 (steps S11 to S32) as in the above-mentioned FIG.

Further, the time between the times t1 and t2, the time between the times t2 and t3, ..., the time between the times t13 and t14, and the time between the times t14 and t15 are the same time (in the present embodiment). 1.2 hours, but not limited to this). Further, the work process time of steps S1, S21, S22, S23, S31, and S32 is the same for _one construction area (that is, each of the construction areas _A1 to Ann). When setting the work process time, it is possible to consider which of the steps S1, S21, S22, S23, S31, and S32 is the critical path.

As shown in FIGS. 13 and ₁₄ , in the present embodiment, the _floor slab is replaced in the construction areas A1 to A6 between the times t1 to t13 (removal of the existing floor slab 5 and a new floor to replace the existing floor slab 5). Placement of version 7) is completed.

In this regard, FIG. 15 shows the relationship between the times t1 to t13 and the respective work processes of the construction areas A1 and _A2 in an example of the conventional _floor slab replacement method. In FIG. 15, after the existing floor slab 5 is removed in the construction area A1 and the new floor slab 7 is placed in place of the existing floor slab _{7, the existing floor slab 5 is removed in the construction area A 2 and} the new floor slab is replaced. When the arrangement of 7 is performed, it is shown that the working time from time t1 to t13 is long.

Therefore, as is clear from the illustrations of FIGS. 13 to 15, when the floor slab replacement method of the present embodiment is used, the floor slab replacement work can proceed much more quickly than the conventional floor slab replacement method. Can be done.

In step S103 of FIG. 3 described above, the mortar and the stud gibber 80 are injected and placed in the space 9 (see FIG. 11B) from the through hole 7a of the new deck 7 arranged on the bridge girder 4. (See FIG. 12), the new floor slab 7 and the bridge girder 4 are fixed and integrated. Further, in step S103 of FIG. 3 described above, the reinforced concrete work is carried out at the interstitial portion (not shown) between the new floor slabs 7 adjacent to each other in the bridge axis direction, so that the new floor slabs 7 are connected to each other. Is fixed and integrated.

According to the present embodiment, the floor slab replacement method divides the structure (bridge ₁ ) into a plurality of construction areas _A1 to Ann in the axial direction of the structure (bridge 1), thereby forming a plurality of construction areas. Includes setting _{A 1} to An. Each of the construction areas _{A1 to An has} a plurality of work steps (steps S1 to S3 (S11 to S32)) from the removal of the existing floor slab 5 to the arrangement of the new floor slab 7. In the floor slab replacement construction progress direction along the axial direction (bridge axis direction) of the structure (bridge 1), the construction area on the front side of the floor slab replacement construction progress direction and the floor slab replacement construction progress direction rearward from this construction area. In the construction area of No. 2, different work processes are carried out in parallel (see FIGS. 2, 13 and 14). As a result, it is possible to proceed with the construction in parallel (that is, at the same time) in a plurality of construction areas where the progress of the floor slab replacement construction is different, so that the replacement from the existing floor slab 5 to the new floor slab 7 is efficient. It can be done well (in other words, in a short period of time) (see FIGS. 13-15).

Further, according to the present embodiment, the work process is performed in the later stage from the construction area on the front side in the floor slab replacement construction progress direction to the construction area on the rear side in the floor slab replacement construction progress direction (for example, shown in FIG. 2). As described above, the work process of a plurality of stages is carried out in parallel (see FIGS. 2, 13 and 14) so as to approach step S32 from the construction area _Ak to the construction area _Ak-6 . As a result, each work process can be advanced while continuing along the direction of the floor slab replacement work, so that the occurrence of pause time (work waiting time) in each work process can be suppressed, and eventually the floor slab can be hung. Replacement work can be performed efficiently.

Further, according to the present embodiment, the removed existing floor slab 5 (floor slab piece 5a) is carried out from the construction areas _A1 to Ann forward in the direction of the _floor slab replacement construction progress, and the new floor slab 7 is carried out in the construction area A. Carry in from the rear in the direction of progress of the floor _slab replacement work to ₁ to Ann. As a result, it is possible to prevent the work of carrying out the existing floor slab 5 (floor slab piece 5a) and the work of carrying in the new floor slab 7 from being confused.

Further, according to the present embodiment, the multi-stage work steps of each of the construction areas _A1 to Ann are the _first work step (step S1) for removing the existing floor slab 5 in the construction area and the existing work process. The second work step (step S2) for carrying out the preparatory work for arranging the new floor slab 7 in the construction area where the floor slab 5 has been removed, and the new floor slab 7 being placed in the construction area where this preparatory work was carried out. A third work step (step S3) is included. Therefore, by making various preparations for the arrangement of the new floor slab 7 prior to the arrangement of the new floor slab 7, the arrangement of the new floor slab 7 can be smoothly performed.

Further, according to the present embodiment, the second work step (step S2) is a height adjustment for adjusting the placement height of the new floor slab 7 placed in the construction area in the third work step (step S3). The material 70 is provided on the upper surface 4a of the bridge girder 4 of the bridge 1 (step S23). As a result, in step S31 (step S3), the new floor slab 7 can be easily arranged in the construction area at the planned arrangement height.

Further, according to the present embodiment, the second work step (step S2) includes performing a cleaning work on the upper surface 4a of the bridge girder 4 of the bridge 1 (step S21). This cleaning work is carried out in the temporary tent 10. Therefore, since the temporary tent 10 can function as a rain shield, it is possible to carry out the cleaning work even in rainy weather. Further, since the dust generated by the cleaning work can stay in the temporary tent 10, it is possible to suppress the scattering of the dust to the outside.

Further, according to the present embodiment, in the work process including the welding work (for example, step S32) among the multi-stage work steps of _each of the construction areas _A1 to Ann, the welding work is carried out in the temporary tent 10. Weld. Therefore, since the temporary tent 10 can function as a rain shield, welding work can be performed even in rainy weather.

Further, according to the present embodiment, the new floor slab 7 is made of precast concrete. Therefore, it is possible to simplify the installation work of the new floor slab 7 at the construction site for replacing the floor slab.

Further, according to the present embodiment, after the arrangement of the new floor slab 7 is completed over the entire length of the bridge 1, the new floor slab 7 and the bridge girder 4 of the bridge 1 are fixed and integrated, and the axial direction of the bridge 1 ( The newly installed floor slabs 7 adjacent to each other in the direction of the bridge axis are fixed and integrated (step S103). As a result, the integration of the new floor slab 7 and the bridge girder 4 and the integration of the adjacent new floor slabs 7 can be performed collectively over the entire length of the bridge 1, so that the integration work can be performed in a short period of time. It can be done efficiently with.

In the present embodiment, after the arrangement of the new deck 7 is completed over the entire length of the bridge 1, the new deck 7 and the bridge girder 4 are fixed and integrated, and the new deck 7 adjacent to each other in the bridge axis direction 7 is fixed. They are fixed to each other and integrated, but in addition to this, after the placement of the new deck 7 is completed over a predetermined section that is shorter than the total length of the bridge 1 and includes a plurality of construction areas, they are collectively set in this predetermined section. , The new deck 7 and the bridge girder 4 may be fixed and integrated, and the new decks 7 adjacent to each other in the bridge axis direction may be fixed and integrated.

16A and 16B are diagrams showing the relationship between the times t1 to _t19 and the respective working steps of the construction areas A1 to A20 in the _second embodiment of the present invention.
The differences from the first embodiment described above will be described.

In the present embodiment, the lengths of the construction areas _A1 to _An in the bridge axis direction are shortened as compared with the first embodiment described above. In the present embodiment, the length of each of the construction areas _{A 1} to An in the bridge axis direction is 2 m, but the length of each of the construction areas _{A 1} to An in the bridge axis direction is not limited to 2 m. .. For example, when the total length Lt of the bridge 1 is 300 m and the lengths of the construction areas A ₁ to An in the bridge axial direction are 2 m, _n = 300/2 = 150.

Further, in the present embodiment, the time between the times t1 and t2, the time between the times t2 and t3, ..., the time between the times t17 and t18, and the time between the times t18 and t19 are the same time, respectively. (In this embodiment, it is set to 0.4 hours, but the present invention is not limited to this).

In the present embodiment, the work process time of step S1 is 0.4 hours and the work process time of step S21 is 0.8 hours (0) for _one construction area (that is, each of the construction areas _A1 to Ann). .4 hours x 2), the work process time of steps S22 and S23 is 1.2 hours (0.4 hours x 3), respectively, and the work process time of step S31 is 0.4 hours. The work process time in step S32 is 0.4 hours.

In the present embodiment, as shown in FIGS. 16A and 16B, it is possible to realize optimization of the time allocation of each work process and optimization of the work range of each work process according to the characteristics of each work process. can. For example, at times t6 to t7, t9 to t10 in FIG. 16A and times t12 to t13, t15 to t16, and t18 to t19 in FIG. 16B, dust is dusted in the temporary tent 10 by suspending the cleaning work in step S21. Can be suppressed from occurring chronically.

FIG. 17 is a flowchart showing a method of arranging the new floor slab 7 in the third embodiment of the present invention.
The differences from the first embodiment described above will be described.

In the present embodiment, instead of step S103, step S33 is added after step S32. That is, in the present embodiment, the stud _gibber 80 is installed in step S32 for each construction area (that is, in _each of the construction areas A1 to Ann), and subsequently, it is newly installed in step S33. The floor slab 7 and the bridge girder 4 are fixed and integrated, and the newly installed floor slabs 7 adjacent to each other in the bridge axis direction are fixed and integrated. Since these integration operations are the same as those in the first embodiment described above, the description thereof will be omitted.

Needless to say, in the above-mentioned second embodiment, as in the present embodiment, step S33 may be added after step S32 instead of step S103.

FIG. 18 is a flowchart showing a method of preparing for placement of the new floor slab 7 in the fourth embodiment of the present invention.
The differences from the first embodiment described above will be described.

In the present embodiment, after performing the cleaning work on the upper surface 4a of the upper flange 4f of the bridge girder 4 in the above-mentioned step S21, the process proceeds to step S24 to measure the shape of the upper surface 4a of the upper flange 4f of the bridge girder 4. After this survey is completed, the process proceeds to step S22, and flange seals 60 are installed on the left and right sides of the upper flange 4f of the bridge girder 4. That is, in the present embodiment, step S24 is added between step S21 and step S22.

Needless to say, in the second and third embodiments described above, step S24 may be added between step S21 and step S22 as in the present embodiment.

FIG. 19 is a flowchart showing a method of arranging the new floor slab 7 in the fifth embodiment of the present invention.
The differences from the first embodiment described above will be described.

In the present embodiment, after the new floor slab 7 is placed on the plurality of height adjusting materials 70 installed on the upper surface 4a of the upper flange 4f of the bridge girder 4 in the above-mentioned step S31, the process proceeds to step S34 and the new installation is performed. Adjust the height of the floor slab 7. After the height adjustment is completed, the process proceeds to step S32, and the plurality of stud gibber 80s are welded and fixed to the upper surface 4a of the upper flange 4f of the bridge girder 4 so as to be located in the through hole 7a of the new deck 7. That is, in the present embodiment, step S34 is added between step S31 and step S32.

Needless to say, in the above-mentioned second to fourth embodiments, step S34 may be added between step S31 and step S32 as in the present embodiment.

FIG. 20 is a flowchart showing a method of preparing for placement of the new floor slab 7 in the sixth embodiment of the present invention.
The differences from the first embodiment described above will be described.

In this embodiment, a plurality of inserts are embedded in the new floor slab 7. Each insert has a female thread that penetrates the new floor slab 7 up and down. A male threaded portion of a bolt having a head on the upper side is screwed into this female threaded portion. The lower end of the male threaded portion of this bolt projects downward from the lower surface 7b of the new deck 7, and can come into contact with the upper surface 4a of the upper flange 4f of the bridge girder 4. By changing the degree of screwing of the male threaded portion of the bolt into the female threaded portion, the amount of protrusion of the lower end portion of the male threaded portion of the bolt downward from the lower surface 7b of the new deck 7 can be changed. Therefore, these inserts and bolts (hereinafter referred to as "insert bolts") can function as height adjusting materials for adjusting the placement height of the new floor slab 7.

In the present embodiment, a plurality of height adjusting materials (for example, the above-mentioned insert bolt) for adjusting the arrangement height of the new floor slab 7 are provided on the new floor slab 7 prior to the above-mentioned step S31. There is. Therefore, since the height adjusting material 70 described above is not required, the step S23 described above may be omitted in the present embodiment as shown in FIG. 20.

In the above-mentioned second to fifth embodiments, as in the present embodiment, the height adjusting material (for example, the above-mentioned insert bolt) for adjusting the arrangement height of the new floor slab 7 is used as described above. Needless to say, if a plurality of the height adjusting members 70 are provided on the new floor slab 7 prior to step S31, the height adjusting material 70 described above becomes unnecessary, so that step S23 can be omitted. In particular, in the above-mentioned fifth embodiment, as in the present embodiment, the height adjusting material (for example, the above-mentioned insert bolt) for adjusting the arrangement height of the new floor slab 7 is provided in the above-mentioned step S31. When a plurality of new floor slabs 7 are provided in advance and step S23 is omitted, these height adjusting materials (for example, the above-mentioned insert bolts) are used in the height adjustment of the new floor slab 7 in step S34. obtain.

In the above-mentioned first embodiment, a work team including a worker and an apparatus is individually organized (that is, division of labor) so as to correspond to each of a plurality of work processes (steps S1, S21 to S23, S31, S32). , These work teams are lined up in a row in the direction of the bridge axis according to the order of work processes (steps S1, S21 to S23, S31, S32) (that is, a production line consisting of these work teams for deck replacement). Something like is formed). Then, these work teams repeat the execution of each work and the movement to the front in parallel, so that the floor slab replacement work proceeds. Therefore, the floor slab replacement work will proceed by the assembly line work accompanied by the forward movement by these work teams. This point is the same not only in the first embodiment but also in the second to sixth embodiments. Here, regarding the work by each work team and the cooperation between the work teams, by utilizing ICT (Information and Communication Technology) including AI (artificial intelligence) technology, a part of the floor slab replacement work or All automation can be achieved, which in turn can significantly improve productivity. Therefore, the floor slab replacement method according to the present invention aims to improve productivity in infrastructure maintenance and renewal by promoting i-Construction (registered trademark) by utilizing ICT, etc., and by creating an attractive work environment. It can be one of the basic technologies to contribute to the increase of the number of young people entering the construction industry, and its industrial applicability is great.

In the above-mentioned _first to sixth embodiments, for example, when the work is delayed in any of the construction areas _A1 to Ann, the number of workers in the construction area where the work is likely to be delayed is increased. , The above-mentioned organization (configuration) of the work team may be changed according to the progress of construction (that is, the organization (configuration) of the work team may be made flexible).

In the above-mentioned first to sixth embodiments, the length of the construction area in which the removal work of the existing floor slab 5 (step S1 described above) is carried out is constant in the bridge axis direction (first and third to sixth embodiments). In the case of 6 m, 2 m in the second embodiment), an example in which the floor slab replacement work proceeds is shown. The length in the direction of the bridge axis may change depending on the time. That is, the length of the construction area in which the removal work of the existing floor slab 5 (step S1 described above) is carried out in the bridge axis direction may be made flexible. If the length of the construction area in which the removal work of the existing floor slab 5 (step S1 described above) is carried out changes depending on the time, the subsequent work is appropriately adjusted to follow it. obtain.

In the above-mentioned _first to sixth embodiments, the lengths of the construction areas A1 to An in the bridge axis direction are constant (6 _m in the first and third to sixth embodiments, 2 m in the second embodiment). However, in addition to this, the lengths of the construction areas _A1 to _An in the bridge axis direction may be different from each other.

In the above-mentioned first embodiment, a work rest period (a period corresponding to the reference numeral “α” in FIG. 2) is provided between the above-mentioned steps S31 and _S32 in _each of the construction areas A1 to Ann. However, this work suspension period is not limited to between step S31 and step S32 described above. In addition to or instead of this, between step S1 and step S21, between step S21 and step S22, between step S22 and step S23, and between step S23 and step S31. At least one of the intervals may optionally be provided with a work suspension period. This point is the same not only in the first embodiment but also in the second to sixth embodiments. Here, the work suspension period can function as an adjustment allowance for the work time of each work.

In the above-mentioned _first to sixth embodiments, the order of the work steps of the construction areas _A1 to _An is the same, but in addition to this, some of the work steps of the construction areas _A1 to Ann are The order may be different from the order of the work steps described in the first to sixth embodiments described above.

In the above-mentioned first to sixth embodiments, the existing floor slab 5 may be made of precast concrete (PCa floor slab may be used). The existing floor slab 5 may be made of cast-in-place concrete. The existing deck 5 may be a steel deck, a synthetic deck, or the like.

In the above-mentioned first to sixth embodiments, the new floor slab 7 may be a floor slab in which precast concrete is used as a part of the floor slab, such as made of half precast concrete. The new floor slab 7 may be made of prestressed concrete (may be a PC floor slab). The new deck 7 may be a steel deck, a synthetic deck, or the like.

In the above-mentioned first to sixth embodiments, a bridge has been described as an example of the "structure" of the present invention, but the "structure" of the present invention is not limited to the bridge. For example, the "structure" of the present invention may be a tunnel having a deck.

The illustrated embodiment is merely an example of the present invention, and the present invention includes various improvements and modifications made by those skilled in the art within the scope of the claims, in addition to those directly shown by the described embodiments. Needless to say, it is an inclusion.
The initial claims of Japanese Patent Application No. 2017-202222 were as follows.
[Claim 1]
It is a method of replacing the floor slab in a structure.
Including setting a plurality of construction areas by dividing the structure into a plurality of construction areas in the axial direction of the structure.
Each construction area has a multi-stage work process from the removal of the existing floor slab to the placement of the new floor slab.
In the floor slab replacement construction progress direction along the axial direction of the structure, different work processes are carried out in parallel in the construction area on the front side of the progress direction and the construction area behind the construction area in the progress direction. How to replace the floor slab.
[Claim 2]
The floor slab replacement according to claim 1, wherein a plurality of stages of work processes are carried out in parallel so that the work process of the latter stage becomes closer to the construction area on the rear side of the traveling direction from the construction area on the front side in the traveling direction. Method.
[Claim 3]
The removed existing floor slab is carried out from the construction area to the front in the traveling direction.
The floor slab replacement method according to claim 1 or 2, wherein the new floor slab is carried into the construction area from the rear in the traveling direction.
[Claim 4]
The multi-stage work process that each construction area has is
The first work process to remove the existing floor slab in the construction area and
The second work process to carry out the preparatory work for arranging the new floor slab in the construction area where the existing floor slab has been removed, and
The third work process of arranging the new floor slab in the construction area where the preparatory work was carried out, and
The floor slab replacement method according to any one of claims 1 to 3, wherein the floor slab is replaced.
[Claim 5]
The structure is a bridge
The second work step includes providing a height adjusting material for adjusting the placement height of the new deck placed in the construction area in the third work step on the upper surface of the bridge girder of the bridge. The floor slab replacement method according to claim 4.
[Claim 6]
The structure is a bridge
The floor slab replacement method according to claim 4, wherein the second work step includes carrying out a cleaning work on the upper surface of the bridge girder of the bridge.
[Claim 7]
The floor slab replacement method according to claim 6, wherein the cleaning work is carried out in a temporary tent.
[Claim 8]
The floor according to any one of claims 1 to 7, wherein the welding work is carried out in a temporary tent in the work process including the welding work among the plurality of steps of the work process that each construction area has. How to replace the plate.
[Claim 9]
The structure is a bridge
After the placement of the new deck is completed over the entire length of the bridge, the new deck and the bridge girder of the bridge are fixed and integrated, and the new decks adjacent to each other in the axial direction of the bridge are fixed and integrated. The floor slab replacement method according to any one of claims 1 to 8, which is to be used.
[Claim 10]
The method for replacing a floor slab according to any one of claims 1 to 9, wherein the new floor slab is made of precast concrete.

1 Bridge 2a, 2b Bridge stand 3 Bridge pedestal 4 Bridge girder 4a Top surface 4f Upper flange 4w Web 5 Existing floor slab 5a Floor slab piece 5b Cutting line 7 New floor slab 7a Through hole 7b Bottom surface 9 Space 10 Temporary tent 20,30 Crane device 21,31 Lower frame 22, 32 Gate type frame 23, 33 Upper frame 24, 34 Lifting device 40 Transport trolley 50a, 50b Jack 51 Beam member 52 PC steel rod 53a, 53b Fixing member 60 Flange seal 70 Height adjusting material 80 Stud gibber A ₁ - _Ak - _An construction area

Claims (10)

In a structure having a bridge girder, it is a method of replacing an existing floor slab with a new floor slab arranged on the bridge girder.
Including setting a plurality of construction areas by dividing into a plurality of construction areas in the axial direction of the structure.
It has an existing floor slab removal process, a new floor slab placement preparation process, and a new floor slab placement process.
The step of removing the existing floor slab includes removing the floor slab piece of the existing floor slab.
The new deck placement preparation step includes preparatory work for placing the new deck on the bridge girder from which the deck piece has been removed.
The new floor slab placement step includes arranging the new floor slab on the bridge girder on which the preparatory work has been performed.
In the floor slab replacement construction progress direction along the axial direction, the existing floor slab removal step is carried out in order from the front side to the rear side in the travel direction, and the existing installation in the first construction area. The second construction area where the new deck placement preparation process is carried out when the deck removal process is carried out, and the new construction when the new deck placement preparation step is carried out in the second construction area. The third construction area where the floor slab placement process is carried out is lined up,
The first crane device used in the existing deck removal process is located on the existing deck on the bridge girder.
The second crane device used in the new deck placement process is located on the deck newly installed on the bridge girder.
The first crane device includes a pair of lower frames extending in the axial direction, a portal frame having a lower end connected to the pair of lower frames, an upper frame provided on the upper portion of the portal frame, and the upper portion. A hoisting device that is movable in the axial direction with respect to the frame, and the like.
How to replace the deck. In a structure having a bridge girder, it is a method of replacing an existing floor slab with a new floor slab arranged on the bridge girder.
Including setting a plurality of construction areas by dividing into a plurality of construction areas in the axial direction of the structure.
It has an existing floor slab removal process, a new floor slab placement preparation process, and a new floor slab placement process.
The step of removing the existing floor slab includes removing the floor slab piece of the existing floor slab.
The new deck placement preparation step includes preparatory work for placing the new deck on the bridge girder from which the deck piece has been removed.
The new floor slab placement step includes arranging the new floor slab on the bridge girder on which the preparatory work has been performed.
In the floor slab replacement construction progress direction along the axial direction, the existing floor slab removal step is carried out in order from the front side to the rear side in the travel direction, and the existing installation in the first construction area. The second construction area where the new deck placement preparation process is carried out when the deck removal process is carried out, and the new construction when the new deck placement preparation step is carried out in the second construction area. The third construction area where the floor slab placement process is carried out is lined up,
The first crane device used in the existing deck removal process is located on the existing deck on the bridge girder.
The second crane device used in the new deck placement process is located on the deck newly installed on the bridge girder.
The first crane device includes a pair of lower frames extending in the axial direction, a gantry frame having a lower end connected to the pair of lower frames, and a lifting device.
The pair of lower frames are provided with rollable wheels.
How to replace the deck. In a structure having a bridge girder, it is a method of replacing an existing floor slab with a new floor slab arranged on the bridge girder.
Including setting a plurality of construction areas by dividing into a plurality of construction areas in the axial direction of the structure.
It has an existing floor slab removal process, a new floor slab placement preparation process, and a new floor slab placement process.
The step of removing the existing floor slab includes removing the floor slab piece of the existing floor slab.
The new deck placement preparation step includes preparatory work for placing the new deck on the bridge girder from which the deck piece has been removed.
The new floor slab placement step includes arranging the new floor slab on the bridge girder on which the preparatory work has been performed.
In the floor slab replacement construction progress direction along the axial direction, the existing floor slab removal step is carried out in order from the front side to the rear side in the travel direction, and the existing installation in the first construction area. The second construction area where the new deck placement preparation process is carried out when the deck removal process is carried out, and the new construction when the new deck placement preparation step is carried out in the second construction area. The third construction area where the floor slab placement process is carried out is lined up,
The first crane device used in the existing deck removal process is located on the existing deck on the bridge girder.
The second crane device used in the new deck placement process is located on the deck newly installed on the bridge girder.
The first crane device includes a pair of lower frames extending in the axial direction, a gantry frame having a lower end connected to the pair of lower frames, and a lifting device.
A carrier vehicle carrying the deck pieces may be placed within the gantry frame and between the pair of lower frames.
How to replace the deck. In a structure having a bridge girder, it is a method of replacing an existing floor slab with a new floor slab arranged on the bridge girder.
Including setting a plurality of construction areas by dividing into a plurality of construction areas in the axial direction of the structure.
It has an existing floor slab removal process, a new floor slab placement preparation process, and a new floor slab placement process.
The step of removing the existing floor slab includes removing the floor slab piece of the existing floor slab.
The new deck placement preparation step includes preparatory work for placing the new deck on the bridge girder from which the deck piece has been removed.
The new floor slab placement step includes arranging the new floor slab on the bridge girder on which the preparatory work has been performed.
In the floor slab replacement construction progress direction along the axial direction, the existing floor slab removal step is carried out in order from the front side to the rear side in the travel direction, and the existing installation in the first construction area. The second construction area where the new deck placement preparation process is carried out when the deck removal process is carried out, and the new construction when the new deck placement preparation step is carried out in the second construction area. The third construction area where the floor slab placement process is carried out is lined up,
The first crane device used in the existing deck removal process is located on the existing deck on the bridge girder.
The second crane device used in the new deck placement process is located on the deck newly installed on the bridge girder.
The second crane device includes a pair of lower frames extending in the axial direction, a portal frame having a lower end connected to the pair of lower frames, an upper frame provided on the upper portion of the portal frame, and the upper portion. A hoisting device that is movable in the axial direction with respect to the frame, and the like.
How to replace the deck. In a structure having a bridge girder, it is a method of replacing an existing floor slab with a new floor slab arranged on the bridge girder.
Including setting a plurality of construction areas by dividing into a plurality of construction areas in the axial direction of the structure.
It has an existing floor slab removal process, a new floor slab placement preparation process, and a new floor slab placement process.
The step of removing the existing floor slab includes removing the floor slab piece of the existing floor slab.
The new deck placement preparation step includes preparatory work for placing the new deck on the bridge girder from which the deck piece has been removed.
The new floor slab placement step includes arranging the new floor slab on the bridge girder on which the preparatory work has been performed.
In the floor slab replacement construction progress direction along the axial direction, the existing floor slab removal step is carried out in order from the front side to the rear side in the travel direction, and the existing installation in the first construction area. The second construction area where the new deck placement preparation process is carried out when the deck removal process is carried out, and the new construction when the new deck placement preparation step is carried out in the second construction area. The third construction area where the floor slab placement process is carried out is lined up,
The first crane device used in the existing deck removal process is located on the existing deck on the bridge girder.
The second crane device used in the new deck placement process is located on the deck newly installed on the bridge girder.
The second crane device includes a pair of lower frames extending in the axial direction, a gantry frame having a lower end connected to the pair of lower frames, and a lifting device.
The pair of lower frames are provided with rollable wheels.
How to replace the deck. In a structure having a bridge girder, it is a method of replacing an existing floor slab with a new floor slab arranged on the bridge girder.
Including setting a plurality of construction areas by dividing into a plurality of construction areas in the axial direction of the structure.
It has an existing floor slab removal process, a new floor slab placement preparation process, and a new floor slab placement process.
The step of removing the existing floor slab includes removing the floor slab piece of the existing floor slab.
The new deck placement preparation step includes preparatory work for placing the new deck on the bridge girder from which the deck piece has been removed.
The new floor slab placement step includes arranging the new floor slab on the bridge girder on which the preparatory work has been performed.
In the floor slab replacement construction progress direction along the axial direction, the existing floor slab removal step is carried out in order from the front side to the rear side in the travel direction, and the existing installation in the first construction area. The second construction area where the new deck placement preparation process is carried out when the deck removal process is carried out, and the new construction when the new deck placement preparation step is carried out in the second construction area. The third construction area where the floor slab placement process is carried out is lined up,
The first crane device used in the existing deck removal process is located on the existing deck on the bridge girder.
The second crane device used in the new deck placement process is located on the deck newly installed on the bridge girder.
The second crane device includes a pair of lower frames extending in the axial direction, a gantry frame having a lower end connected to the pair of lower frames, and a lifting device.
The transport carriage that transports the new deck can travel within the gantry frame and between the pair of lower frames.
How to replace the deck. The existing floor slab removal step includes lifting work of the floor slab piece.
The new deck placement preparation step includes at least one of cleaning work on the upper surface of the bridge girder, installation work of a height adjusting material on the upper surface of the bridge girder, and installation work of a seal on the upper surface of the bridge girder.
The new floor slab placement process includes the installation work of the new floor slab.
The floor slab replacement method according to any one of claims 1 to 6. In a structure having a bridge girder, it is a method of replacing an existing floor slab with a new floor slab arranged on the bridge girder.
Including setting a plurality of construction areas by dividing into a plurality of construction areas in the axial direction of the structure.
It has an existing floor slab removal process, a new floor slab placement preparation process, and a new floor slab placement process.
The step of removing the existing floor slab includes removing the floor slab piece of the existing floor slab.
The new deck placement preparation step includes preparatory work for placing the new deck on the bridge girder from which the deck piece has been removed.
The new floor slab placement step includes arranging the new floor slab on the bridge girder on which the preparatory work has been performed.
In the floor slab replacement construction progress direction along the axial direction, the existing floor slab removal step is carried out in order from the front side to the rear side in the travel direction, and the existing installation in the first construction area. The second construction area where the new deck placement preparation process is carried out when the deck removal process is carried out, and the new construction when the new deck placement preparation step is carried out in the second construction area. The third construction area where the floor slab placement process is carried out is lined up,
The axial length of the second construction area is longer than the axial length of the deck piece.
The first crane device used in the existing deck removal process is located on the existing deck on the bridge girder.
The second crane device used in the new deck placement process is located on the deck newly installed on the bridge girder.
How to replace the deck. In a structure having a bridge girder, it is a method of replacing an existing floor slab with a new floor slab arranged on the bridge girder.
Including setting a plurality of construction areas by dividing into a plurality of construction areas in the axial direction of the structure.
It has an existing floor slab removal process, a new floor slab placement preparation process, and a new floor slab placement process.
The step of removing the existing floor slab includes removing the floor slab piece of the existing floor slab.
The new deck placement preparation step includes preparatory work for placing the new deck on the bridge girder from which the deck piece has been removed.
The new floor slab placement step includes arranging the new floor slab on the bridge girder on which the preparatory work has been performed.
In the floor slab replacement construction progress direction along the axial direction, the existing floor slab removal step is carried out in order from the front side to the rear side in the travel direction, and the existing installation in the first construction area. The second construction area where the new deck placement preparation process is carried out when the deck removal process is carried out, and the new construction when the new deck placement preparation step is carried out in the second construction area. The third construction area where the floor slab placement process is carried out is lined up,
The axial length of the second construction area is longer than the axial length of the new deck.
The first crane device used in the existing deck removal process is located on the existing deck on the bridge girder.
The second crane device used in the new deck placement process is located on the deck newly installed on the bridge girder.
How to replace the floor slab. The existing floor slab removal step includes lifting work of the floor slab piece.
The new deck placement preparation step includes at least one of cleaning work on the upper surface of the bridge girder, installation work of a height adjusting material on the upper surface of the bridge girder, and installation work of a seal on the upper surface of the bridge girder.
The new floor slab placement process includes the installation work of the new floor slab.
The floor slab replacement method according to claim 8 or 9.

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