JP6826872B2 - How to remove concrete slab and how to install new concrete slab - Google Patents

Description

The present invention relates to a method for removing a concrete slab and a method for newly installing a concrete slab.

In recent years, in bridges where concrete slabs for roads, etc. are supported by girders, fatigue damage to concrete slabs due to larger vehicles and an increase in the number of passing vehicles, and salt damage deterioration due to spraying of antifreeze agents are remarkable. It is becoming more and more necessary to replace the concrete floor slab. For example, Patent Document 1 describes a concrete slab that is joined to the upper surface of the girder by including a gibber protruding from the upper surface of the girder with a hardened material and has a haunch portion formed at the joint with the upper surface of the girder. Techniques for removing from the top surface of the concrete are disclosed. In the technique of Patent Document 1, a steel slab is installed on the upper surface of the girder after the gibber protruding from the upper surface of the girder is removed and the concrete slab is removed from the upper surface of the girder.

Gazette No. 6-80244

By the way, when removing the concrete slab, for example, by inserting concrete cutters on both sides of the upper surface of the girder, the concrete slabs on both sides of the upper surface of the girder are removed. By scraping the concrete directly above the upper surface of the girder with a breaker or the like, the concrete slab directly above the upper surface of the girder is removed. The number of girders is large, the reinforcing bars are arranged so as to surround the girders, and the work of scraping the concrete directly above the upper surface of the girder is a manual work to avoid damaging the girder. The work of scraping the concrete directly above the top surface requires a great deal of labor.

In general, precast concrete slabs are often used for newly installed slabs, but due to revisions to standards, precast slabs need to be thicker than existing concrete slabs. There is. In order to replace the road surface with a thick precast slab without changing the height of the road surface from the ground, it is necessary to reduce the thickness of the haunch portion at the joint between the upper surface of the girder and the precast slab. Therefore, when installing a new precast mortar after removing the concrete slab, the existing jibel will install a new precast slab or the flow of non-shrink mortar injected between the precast slab and the upper surface of the girder. It is necessary to remove the existing gibber over the entire length so as not to be an obstacle, and the work of removing the existing gibber also requires a great deal of labor.

Therefore, an object of the present invention is to remove the concrete slab from the upper surface of the girder while reducing labor.

In the present invention, the concrete slab which is joined to the upper surface of the girder by including the gibber protruding from the upper surface of the girder by the hardening material and has a haunch portion formed at the joint with the upper surface of the girder is removed from the upper surface of the girder. This is a method for removing the concrete floor slab, which is a method of drilling holes in the haunch portion and cracks that generate cracks that reach the gibber in the haunch portion starting from the holes drilled in the drilling process. The slab separation that separates the concrete slab from the girder with the cracks generated in the crack generation process as the boundary between the jibel cutting process that cuts the gibber inside the haunch from the cracks generated in the crack generation process. It is a method of removing a concrete floor slab equipped with a process.

According to this configuration, the concrete floor slab is joined to the upper surface of the girder by including the gibber protruding from the upper surface of the girder by the hardening material, and the haunch portion is formed at the joint with the upper surface of the girder. In the method of removing the concrete floor slab for removing from the concrete floor slab, a hole is drilled in the haunch portion by the drilling process, and a crack that reaches the gibber at the haunch portion starting from the hole drilled in the drilling process by the crack generation process. Is generated, and the gibber inside the haunch part is cut from the crack generated in the crack generation process by the gibber cutting process, and the concrete floor slab is separated from the girder with the crack generated in the crack generation process by the slab separation process as the boundary. Be separated. After the separation step, only the concrete slab under the cracks generated in the cracking step and the rest of the gibber remain on the upper surface of the girder. Therefore, the concrete slab can be removed from the upper surface of the girder while reducing the labor of scraping the concrete directly above the upper surface of the girder and removing the existing gibber.

In this case, it is preferable to further include a jig installation step of installing a jig for fixing the concrete floor slab to the girder before the gibber cutting step.

According to this configuration, since the jig for fixing the concrete floor slab to the girder is installed before the gibber cutting process by the jig installation process, the concrete floor is also between the gibber cutting process and the floor slab separation process. It is not necessary to close the road formed by the plate, and the period of closure can be shortened.

Further, in the present invention, after the floor slab separation step of the concrete floor slab removing method of the present invention, a sealing material is installed on the peripheral edge of the upper surface of the girder without removing the remaining part of the gibber cut in the gibber cutting step. After the sealing material installation process and the sealing material installation process, a new precast floor slab formed of ultra-high strength fiber reinforced concrete is placed on the upper surface of the girder via the sealing material installed in the sealing material installation process. A concrete floor slab including a floor slab placement process, a new floor slab placement process, and then a filling process of filling and solidifying the space surrounded by the upper surface of the girder, the precast floor slab, and the sealing material. It is a new construction method of.

According to this process, a new precast slab formed of ultra-high-strength fiber reinforced concrete, which can be made thinner than the existing concrete slab by the new slab placement process, is placed on the upper surface of the girder via a sealing material. Since it is arranged, it is not necessary to remove the remaining part of the gibber cut in the gibber cutting step in the sealing material installation step, and the remaining part of the gibber does not hinder the flow of the filler in the filling step. Therefore, a new floor slab can be newly installed while reducing the labor for removing the remaining part of the gibber.

According to the method for removing a concrete slab of the present invention, the concrete slab can be removed from the upper surface of the girder while reducing labor. Further, according to the new construction method of the concrete slab of the present invention, a new slab can be newly installed while reducing the labor for removing the remaining portion of the gibber.

(A) is a side view showing a bridge to which the concrete slab removal method and the concrete slab new construction method according to the embodiment are applied, and (B) is a sectional view taken along line α of (A). (A) is a side view showing the bridge after the drilling process, and (B) is a cross-sectional view taken along line β of (A). (A) is a side view showing the bridge after the crack generation process, and (B) is a cross-sectional view taken along line δ of (A). (A) is a cross-sectional view taken along the line γ of FIG. 2 (A) after the drilling process, (B) is a rear view of the wedge used in the crack generation process, and (C) is used in the crack generation process. It is a side view of the wedge, (D) is a front view of the wedge used in the crack generation process, and (E) is a view showing a state in which a pair of wedges are inserted from both sides of the hole (A). (F) is a cross-sectional view taken along the line ε of (E), (G) is a view showing a state in which the insertion of the wedge of (E) has progressed, and (H) is a cross-sectional view taken along the line ζ of (G). (I) is a diagram showing a state in which the insertion of the wedge of (G) has progressed, and (J) is a cross-sectional view taken along the line η of (I). (A) is a side view showing the bridge after the jig installation process, and (B) is a cross-sectional view taken along line θ1 of (A). 5 is a cross-sectional view taken along the line θ2 of FIG. 5A. (A) is a side view showing the bridge after the gibber cutting process, and (B) is a cross-sectional view taken along the line ι of (A). (A) is a side view showing the bridge after the plate separation step, and (B) is a cross-sectional view taken along the line κ of (A). (A) is a side view showing the bridge after the sealing material is installed, and (B) is a cross-sectional view taken along the line λ of (A). (A) is a side view showing a bridge after a new floor slab arrangement process, and (B) is a cross-sectional view taken along line μ of (A). (A) is a side view showing the bridge after the filling process, and (B) is a cross-sectional view taken along the line ν of (A).

Hereinafter, a method for removing the concrete slab and a method for newly installing the concrete slab according to the embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1A and 1B, the method for removing the concrete slab and the method for newly installing the concrete slab according to the present embodiment already exist on the upper surface 11 of the flange 12 of the girder 10 such as a steel girder. It is applied to the bridge 1 on which the concrete slab 20 such as the RC slab 20 is installed. The bridge 1 may be a synthetic girder bridge or a non-synthetic girder bridge.

A gibber such as a stud gibber 13 projects from the upper surface 11 of the flange 12 of the girder 10. The concrete floor slab 20 is joined to the upper surface 11 of the girder 10 by including a gibber such as a stud gibber 13 protruding from the upper surface 11 of the girder 10 by a hardening material such as concrete 21 forming the concrete floor slab 20. .. In addition to the above-mentioned stud gibber 13, the gibber includes a reinforcing bar gibber made of rod-shaped reinforcing bars and both ends of the rod-shaped reinforcing bars of the U-shaped reinforcing bars in which the rod-shaped reinforcing bars are curved in a U shape. Includes U-shaped rebar gibber and the like fixed to.

In the concrete floor slab 20, the haunch portion 22 is formed at the joint portion 30 with the upper surface 11 of the girder 10. The haunch portion 22 includes a surface that connects the supported surface 23 supported by the upper surface 11 of the girder 10 and the floor slab lower surface 24 above the supported surface 23. The haunch portion is a joint between the upper surface of the girder and the concrete floor slab, the supported surface of the concrete floor slab supported by the upper surface of the girder, and the lower surface of the concrete floor slab above the supported surface. The angle of the surface connecting the supported surface and the lower surface of the floor slab may be greater than 0 ° and less than 90 ° with respect to the horizontal direction, and is horizontal. It may be at an angle of 90 ° with respect to the direction. That is, the haunch portion 22 includes an object in which the surface connecting the supported surface and the lower surface of the floor slab is not inclined and is parallel in the vertical direction.

The method for removing the concrete slab of the present embodiment is a method for removing the concrete slab 20 as described above from the upper surface 11 of the girder 10. Hereinafter, each step of the method for removing the concrete floor slab of the present embodiment will be described.

As shown in FIGS. 2A and 2B, a drilling step of drilling a hole 40 in the haunch portion 22 is performed. In the drilling step, a hole 40 can be drilled in the haunch portion 22 by applying a reamer to the concrete 21 of the haunch portion 22. The size of the hole 40 is such that an expandable agent, a jack, a wedge, or the like can be inserted into the hole 40 in order to generate a crack in the crack generation step described later. The size of the hole 40 is, for example, the inner diameter of the hole 40 is about 15 to 25 [mm], and the inner diameter of the hole 40 can be 20 [mm].

The position where the hole 40 is drilled is, for example, in the vicinity of a gibber with a horizontal margin so that the inner surface of the hole 40 does not contact the gibber such as the stud gibber 13, and the hole is formed in the upper surface 11 of the girder 10. It is preferable that the vicinity of the upper surface 11 is separated by a margin in the vertical direction so that the inner surfaces of 40 do not touch each other. A plurality of holes 40 are drilled for each of the stud gibber 13. The positions where the holes 40 are drilled may be a plurality of positions at regular intervals in the bridge axis direction in the haunch portion 22, regardless of the positions of the gibber such as the stud gibber 13. The drilling step can be performed without blocking the road formed by the concrete slab 20.

As shown in FIGS. 3A and 3B, a crack generation step of generating a crack 60 that reaches a gibber such as a stud gibber 13 in the haunch portion 22 starting from the hole 40 drilled by the drilling step. Is done. In the crack generation step, by inserting an expandable agent, a jack, a wedge, or the like into the hole 40, a gibber such as a stud gibber 13 can be stretched to generate a crack 60 starting from the hole 40. ..

For example, as shown in FIG. 4 (A), with respect to the hole 40 having an inner diameter of 20 [mm] drilled after the drilling step, FIGS. 4 (B), 4 (C) and 4 (D) A wedge 41 having an outer diameter of 19 [mm] as shown in is prepared. The wedge 41 is a columnar metal material having a tip 42 and an end 43, and has a tapered surface 44 connecting the end 43 having a circular end face and the tip 42 having a semicircular end face. As shown in FIGS. 4 (E) and 4 (F), the tips 42 of the pair of wedges 41 hit each other through both openings of the holes 40, with the tapered surfaces 44 facing each other in the vertical direction. It is inserted so that it touches. As shown in FIGS. 4 (G) and 4 (H), as the insertion of the pair of wedges 41 progresses, a reaction force is generated by the tapered surfaces 44 of the pair of wedges 41 to separate the pair of wedges 41 in the vertical direction, and a crack 60 is generated. To do. As shown in FIGS. 4 (I) and 4 (J), as the insertion of the pair of wedges 41 further progresses, the crack 60 expands. In this way, the wedge 41 can generate a crack 60 starting from the hole 40.

The crack 60 starts from a hole 40 near the upper surface 11 of the stud gibber 13 and the girder 10, and is not strictly integrated with the upper surface 11, so that the crack 60 is relatively fragile. It is expected to extend in the vicinity of. Therefore, to generate a crack that reaches the gibber in the haunch portion starting from the hole drilled by the drilling process means to generate a crack that reaches the gibber at least from the hole drilled by the drilling process. This includes the generation of cracks terminating on the outer surface such as the supported surface supported by the upper surface of the girder of the concrete floor slab at a portion other than the drilled hole.

The width of the crack 60 is a size capable of cutting a gibber such as a stud gibber 13 by fusing such as gas cutting or laser cutting or by a contact type tool such as a wire saw in the gibber cutting step described later. The crack generation step can be performed without blocking the road formed by the concrete slab 20. However, the road surface of the road formed by the concrete slab 20 may rise by the width of the crack 60. Therefore, the width of the crack 60 is preferably set to a size that does not hinder the running of the vehicle on the road.

As shown in FIGS. 5 (A), 5 (B) and 6, a jig installation step of installing a jig 50 for fixing the concrete floor slab 20 to the girder 10 before the gibber cutting step described later. Is done. The jig 50 has a girder fixing portion 51, a floor slab fixing portion 52, and a rib 53. The jig 50 is manufactured of a steel plate or the like. The girder fixing portion 51 is fixed to the girder 10 by bolts 54. The floor slab fixing portion 52 is fixed to the floor slab lower surface 24 of the concrete floor slab 20 by bolts 54. The rib 53 reinforces the jig 50 against the compressive stress and the tensile stress acting between the girder fixing portion 51 and the floor slab fixing portion 52.

The jig installation step is preferably performed after the crack generation step and before the gibber cutting step described later. However, if the hole 40 can be drilled with the jig 50 installed, it may be drilled before the drilling step. Further, if it is possible to generate the crack 60 while the jig 50 is installed, it may be performed before the crack generation step. The jig installation process can be performed without blocking the road formed by the concrete slab 20.

As shown in FIGS. 7 (A) and 7 (B), a gibber cutting step of cutting a gibber such as a stud gibber 13 inside the haunch portion 22 from the crack 60 generated in the crack generation step is performed. In the gibber cutting step, the gibber can be cut by applying fusing such as gas cutting or laser cutting from the crack 60 to the gibber such as the stud gibber 13 inside the haunch portion 22. The crack 60 prevents the metal of the gibber melted by fusing from staying and hindering fusing. A gibber such as a stud gibber 13 may be cut from the crack 60 by a contact type tool such as a wire saw. The gibber cutting step can be performed without blocking the road formed by the concrete slab 20.

As shown in FIGS. 8 (A) and 8 (B), the road formed by the concrete slab 20 is closed, the jig 50 installed in the jig installation process is removed, and then in the crack generation process. A slab separation step of separating the concrete slab 20 from the girder 10 is performed with the generated crack 60 as a boundary. In the floor slab separation step, the concrete floor slab 20 can be separated from the girder 10 by, for example, lifting the concrete floor slab 20 upward by a crane or the like.

The concrete floor slab 20 separated from the girder 10 in the floor slab separation step can be easily removed by a crane or the like by subdividing it with a concrete cutter. After the separation step, only the rest of the gibber such as the concrete floor slab 20 and the stud gibber 13 under the crack 60 generated in the crack generation step remains on the upper surface 11 of the girder 10. The rest of the concrete floor slab 20 is removed by a breaker or the like.

Hereinafter, a method for newly installing the concrete floor slab of the present embodiment will be described. As shown in FIGS. 9 (A) and 9 (B), after the floor slab separation step of the method for removing the concrete floor slab of the present embodiment, the rest of the gibber such as the stud gibber 13 cut in the gibber cutting step is removed. Without removing it, a sealing material installation step of installing the sealing material 70 on the peripheral edge of the upper surface 11 of the girder 10 is performed.

As the sealing material 70, for example, a mold plate or the like including a sealing sponge or the like at its end can be applied. The height of the girder 10 of the sealing material 70 from the upper surface 11 is, for example, the height obtained by subtracting the thickness of the newly constructed concrete slab from the height from the upper surface of the road surface formed by the concrete slab 20. Is. As shown in FIGS. 9A and 9B, a new stud gibber 14 or the like is located at the position of the upper surface 11 of the girder 10 where there is no remaining gibber such as the stud gibber 13 cut in the gibber cutting step. Gibel may be newly installed.

As shown in FIGS. 10 (A) and 10 (B), after the sealing material installation process, a new precast floor slab 80 formed of ultra-high-strength fiber reinforced concrete 81 is installed in the sealing material installation process. A new floor slab arranging step of arranging the girder 10 on the upper surface 11 via the material 70 is performed. Ultra-high-strength fiber-reinforced concrete means ultra-high-strength fiber-reinforced concrete whose materials and manufacturing methods are specified in the "Design and Construction Guidelines (Draft)" published by the Japan Society of Civil Engineers.

As shown in FIGS. 10A and 10B, when a new gibber such as a stud gibber 14 is newly installed on the upper surface 11 of the girder 10, the precast floor slab 80 is newly installed on the stud gibber 14 The precast floor slab 80 is placed on the upper surface 11 of the girder 10 so as to have a slip-preventing hole 82 that surrounds the above, etc. on its inner surface, and the inner surface of the slip-preventing hole 82 surrounds the newly installed stud gibber 14 and the like. It may be arranged.

As shown in FIGS. 11 (A) and 11 (B), after the new floor slab placement step, a non-shrink mortar is placed in a space surrounded by the upper surface 11 of the girder 10, the precast floor slab 80, and the sealing material 70. A filling step is performed in which a filler such as 90 is filled and solidified. As shown in FIGS. 11 (A) and 11 (B), when a new gibber is newly provided on the upper surface 11 of the girder 10 and the precast floor slab 80 has a slip prevention hole 82, a slip prevention hole is provided. Part 82 may be filled with expanded concrete or non-shrink mortar.

According to the present embodiment, a hardened material such as concrete 21 forming the concrete floor slab 20 includes a gibber such as a stud gibber 13 projecting from the upper surface 11 of the girder 10 to be joined to the upper surface 11 of the girder 10. In the method of removing the concrete floor slab 20 in which the haunch portion 22 is formed on the joint portion 30 with the upper surface 11 of the girder 10 from the upper surface 11 of the girder 10, a hole is formed in the haunch portion 22 by a drilling step. 40 is drilled, and a crack 60 that reaches the stud gibber 13 is generated in the haunch portion 22 starting from the hole 40 drilled in the drilling step by the crack generation step, and is generated in the crack generation step by the gibber cutting step. The stud gibber 13 inside the haunch portion 22 is cut from the crack 60, and the concrete floor slab 20 is separated from the girder 10 with the crack 60 generated in the crack generation step as a boundary in the floor slab separation step. After the separation step, only the rest of the concrete slab 20 and the stud gibber 13 under the crack 60 generated in the crack generation step remains on the upper surface 11 of the girder 10. Therefore, the concrete floor slab 20 can be removed from the upper surface 11 of the girder 10 while reducing the labor of scraping the concrete 21 directly above the upper surface 11 of the girder 10 and removing the existing stud gibber 13.

When the concrete slab 20 is removed or newly installed, it is required to minimize the period during which the road formed by the concrete slab 20 is closed. Therefore, it is necessary to remove the concrete slab 20 immediately after the road closure is started. Therefore, it is desirable that the cutting of the gibber such as the stud gibber 13 is performed while the vehicle or the like is passing through the road formed by the concrete slab 20. According to this embodiment, since the jig 50 for fixing the concrete floor slab 20 to the girder 10 is installed in the jig installation process before the gibber cutting step, the gibber cutting step and the floor slab separation step are combined. It is not necessary to close the road formed by the concrete slab 20 between them, and the period of the road closure can be shortened.

In addition, a new precast floor slab 80 formed of ultra-high-strength fiber reinforced concrete that can be made thinner than the existing concrete floor slab 20 by the new floor slab placement process is placed on the upper surface 11 of the girder 10 via the sealing material 70. In the sealing material installation step, it is not necessary to remove the remaining part of the gibber such as the stud gibber 13 cut in the gibber cutting step, and in the filling step, the remaining part of the gibber is a filler such as non-shrink mortar 90. It does not become a flow obstacle. Therefore, a new floor slab can be newly installed while reducing the labor for removing the remaining part of the gibber.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and is implemented in various forms. For example, the mode of drilling in the drilling process, cracking in the crack generation process, and the jig in the jig installation process can be appropriately changed. Further, after the floor slab separation step of the method for removing the concrete floor slab of the present embodiment, a concrete floor slab such as an RC floor slab not formed of ultra-high strength fiber reinforced concrete may be newly installed. When it is necessary to increase the thickness of the concrete floor slab not formed of the ultra-high strength fiber reinforced concrete, the remainder of the gibber such as the stud gibber 13 cut in the gibber cutting step is removed. Since the remnants of the gibber are short, the effort required to remove the remnants of the gibber is reduced.

1 ... Bridge, 10 ... Girder, 11 ... Top surface, 12 ... Flange, 13, 14 ... Stud jig bell, 20 ... Concrete floor slab, 21 ... Concrete, 22 ... Haunch part, 23 ... Supported surface, 24 ... Floor slab bottom surface, 30 ... Joint, 40 ... Hole, 41 ... Rabbit, 42 ... Tip, 43 ... End, 44 ... Tapered surface, 50 ... Jig, 51 ... Girder fixing part, 52 ... Floor slab fixing part, 53 ... Rib, 54 ... Bolts, 60 ... cracks, 70 ... sealing materials, 80 ... precast floor slabs, 81 ... ultra-high strength fiber reinforced concrete, 82 ... slip prevention holes, 90 ... non-shrink mortar.

Claims (3)

A concrete floor slab that is joined to the upper surface of the girder by including a gibber protruding from the upper surface of the girder with a hardened material and has a haunch portion formed at the joint portion with the upper surface of the girder is formed on the upper surface of the girder. It is a method of removing concrete floor slabs to remove from
A drilling process for drilling a hole in the haunch portion and
A crack generation step of generating a crack reaching the gibber in the haunch portion starting from the hole drilled by the hole drilling step.
A gibber cutting step of cutting the gibber inside the haunch portion from the crack generated in the crack generation step,
A floor slab separation step of separating the concrete floor slab from the girder with the crack generated in the crack generation step as a boundary.
Prior to the gibber cutting step, a jig installation step of installing a jig for fixing the concrete slab to the girder, and a jig installation step.
With
In the jig installation process,
The girder fixing part fixed to the girder and
A floor slab fixing portion fixed to the lower surface of the floor slab of the concrete floor slab,
A rib that reinforces the jig against compressive stress and tensile stress acting between the girder fixing portion and the floor slab fixing portion.
A method for removing a concrete floor slab, in which the jig is installed. A concrete slab formed by joining the girder to the upper surface of the girder by including a gibber protruding from the upper surface of the girder and having a haunch portion formed at the joint with the upper surface of the girder is formed on the upper surface of the girder. It is a method of removing concrete floor slabs to remove from
A drilling process for drilling a hole in the haunch portion and
A crack generation step of generating a crack reaching the gibber in the haunch portion starting from the hole drilled by the hole drilling step.
A gibber cutting step of cutting the gibber inside the haunch portion from the crack generated in the crack generation step,
After the floor slab separation step of the method for removing the concrete floor slab, which comprises the floor slab separation step of separating the concrete floor slab from the girder with the crack generated in the crack generation step as a boundary .
A sealing material installation step of installing a sealing material on the peripheral edge of the upper surface of the girder without removing the remaining portion of the gibber cut in the gibber cutting step.
After the sealing material installation step, a new precast floor slab formed of ultra-high-strength fiber reinforced concrete is placed on the upper surface of the girder via the sealing material installed in the sealing material installation step. Placement process and
After the new floor slab placement step, a filling step of filling and solidifying the filling material in the space surrounded by the upper surface of the girder, the precast floor slab, and the sealing material .
How to install a new concrete floor slab equipped with. A concrete floor slab that is joined to the upper surface of the girder by including a gibber protruding from the upper surface of the girder with a hardened material and has a haunch portion formed at the joint portion with the upper surface of the girder is formed on the upper surface of the girder. It is a method of removing concrete floor slabs to remove from
A drilling process for drilling a hole in the haunch portion and
A crack generation step of generating a crack reaching the gibber in the haunch portion starting from the hole drilled by the hole drilling step.
A gibber cutting step of cutting the gibber inside the haunch portion from the crack generated in the crack generation step,
A floor slab separation step of separating the concrete floor slab from the girder with the crack generated in the crack generation step as a boundary.
Before the gibber cutting step, after the jig installation step of installing the jig for fixing the concrete deck to the girder, and after the deck separation step of the method of removing the concrete deck provided with the jigbel cutting step .
A sealing material installation step of installing a sealing material on the peripheral edge of the upper surface of the girder without removing the remaining portion of the gibber cut in the gibber cutting step.
After the sealing material installation step, a new precast slab formed of ultra-high-strength fiber reinforced concrete is placed on the upper surface of the girder via the sealing material installed in the sealing material installation step. Placement process and
After the new floor slab placement step, a filling step of filling and solidifying the filling material in the space surrounded by the upper surface of the girder, the precast floor slab, and the sealing material .
How to install a new concrete floor slab equipped with.

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