JP7619929B2 - Grout filling method and grout filling structure - Google Patents

Description

The present invention relates to a grout filling method and a grout filling structure.

The prestressed concrete (PC) that constitutes the deck is tensioned by the PC steel. A sheath tube that contains the PC steel, which is arranged inside the member as a duct for later insertion of the PC steel, is embedded in the deck. To prevent the PC steel from rusting and ensure its ultimate strength through adhesion, the inside of the sheath tube that contains the PC steel is filled with grout, which is a fluid liquid such as cement (mortar), to fill the gap between the sheath tube and the PC steel. For example, Patent Document 1 discloses a technology in which grout is filled from one end of a sheath tube that is embedded in the deck and contains the PC steel inside. In the technology of Patent Document 1, exhaust is exhausted from inside the sheath tube through an exhaust pipe that is connected from the upper end of the inside of the sheath tube to the upper surface of the deck.

Patent No. 4982666

However, with the above technology, work must be done on the top surface of the deck, such as checking whether grout is being discharged from the exhaust pipe, which means that other work cannot be done on the top surface of the deck. For this reason, there is a need for improvements in the technology for filling grout inside the sheath pipe that is embedded in the deck and contains PC steel.

The present invention aims to provide a grout filling method and grout filling structure that can properly fill grout while reducing work on the top surface of the deck.

The present invention is a grout filling method for filling grout into the inside of a sheath tube that is embedded in a deck slab and contains PC steel material inside, and includes an injection process for injecting grout into the inside of the sheath tube through an injection pipe that communicates from the underside of the deck slab to the upper end of the inside of the sheath tube, and an exhaust process for exhausting gas from the inside of the sheath tube through an exhaust pipe that communicates from the upper end of the inside of the sheath tube to the underside of the deck slab.

According to this configuration, in the grout filling method for filling the inside of a sheath tube that is embedded in a deck slab and contains PC steel material inside, in the injection process, grout is injected into the inside of the sheath tube through an injection tube that communicates with the upper end of the inside of the sheath tube from the underside of the deck slab, and in the exhaust process, exhaust is exhausted from the inside of the sheath tube through an exhaust pipe that communicates with the upper end of the inside of the sheath tube from the underside of the deck slab. The injection pipe injects grout from the underside of the deck slab, and the exhaust pipe exhausts from the underside of the deck slab, reducing work on the top surface of the deck.

In addition, since the injection pipe injects grout from the upper end inside the sheath pipe and the exhaust pipe exhausts from the upper end inside the sheath pipe, even if grout leaks from the injection pipe or exhaust pipe for some reason after the injection and exhaust of grout, air will be trapped in the injection pipe or exhaust pipe near the upper end inside the sheath pipe, reducing the amount of air remaining inside the sheath pipe that would hinder the re-injection of grout.

In addition, even if bleeding occurs, water can be expelled into the injection pipe or exhaust pipe near the top end inside the sheath pipe. This allows for proper grout filling while reducing work on the top surface of the deck.

The present invention also provides a grout-filled structure that includes a deck slab, a sheath tube that is embedded in the deck slab and contains PC steel material inside, an injection tube that connects from the underside of the deck slab to the upper end of the inside of the sheath tube and injects grout into the inside of the sheath tube, and an exhaust pipe that connects from the upper end of the inside of the sheath tube to the underside of the deck slab and exhausts from the inside of the sheath tube, the injection flow path of the injection tube passes from the underside of the deck slab to an upper position that is higher than the upper end of the inside of the sheath tube, passes from the upper position to a lower position that is lower than the lower end of the inside of the sheath tube, and connects from the lower position to the upper end of the inside of the sheath tube, and the exhaust flow path of the exhaust pipe passes from the upper end of the inside of the sheath tube to a lower position, passes from the lower position to an upper position, and connects from the upper position to the underside of the deck slab.

According to this configuration, in a grout-filled structure that includes a deck slab, a sheath pipe that is embedded in the deck slab and contains PC steel material inside, an injection pipe that injects grout into the inside of the sheath pipe, and an exhaust pipe that exhausts from inside the sheath pipe, the injection pipe injects grout from the underside of the deck slab, and the exhaust pipe exhausts from the underside of the deck slab, reducing work on the top surface of the deck.

In addition, since the injection pipe injects grout from the upper end inside the sheath pipe and the exhaust pipe exhausts from the upper end inside the sheath pipe, even if grout leaks from the injection pipe or exhaust pipe for some reason after the injection and exhaust of grout, air will be trapped in the injection pipe or exhaust pipe near the upper end inside the sheath pipe, reducing the amount of air remaining inside the sheath pipe that would hinder the re-injection of grout. Also, even if bleeding occurs, water can be expelled to the injection pipe or exhaust pipe near the upper end inside the sheath pipe.

Furthermore, the injection flow path of the injection pipe passes from the underside of the deck slab through an upper position higher than the upper end of the inside of the sheath pipe, passes from the upper position through a lower position lower than the lower end just below the upper end of the inside of the sheath pipe, and then communicates from the lower position to the upper end of the inside of the sheath pipe, and the exhaust flow path of the exhaust pipe passes from the upper end of the inside of the sheath pipe through a lower position, passes from the lower position through an upper position, and then communicates from the upper position to the underside of the deck slab. Therefore, even if grout leaks from the injection pipe or exhaust pipe after the injection and exhaust of grout for some reason, the air stops near the upper position of the injection pipe or exhaust pipe, which further reduces the amount of air remaining inside the sheath pipe that would hinder the re-injection of grout.

In this case, it is preferable that the injection flow path of the injection pipe passes from the underside of the deck slab to an upper position by winding around the outside of the sheath pipe.

With this configuration, the injection flow path of the injection pipe is wound around the outside of the sheath pipe, so that it connects from the underside of the deck to the upper position, from the upper position to the lower position, and from the lower position to the upper end of the inside of the sheath pipe, making it possible to reduce the area of the deck that is occupied by the injection pipe.

In addition, it is preferable that the exhaust flow path of the exhaust pipe is wound around the outside of the sheath tube so that it connects from the upper end of the inside of the sheath tube to a lower position, from the lower position to an upper position, and from the upper position to the underside of the deck slab.

With this configuration, the exhaust flow path of the exhaust pipe is wound around the outside of the sheath pipe, passing from the upper end of the inside of the sheath pipe to a lower position, passing from the lower position to an upper position, and then communicating from the upper position to the underside of the deck, so the area of the deck that is occupied by the exhaust pipe can be made small.

It is also preferable that the injection flow path of the injection tube extends from the upper end inside the sheath tube to the side of the sheath tube.

With this configuration, the injection flow path of the injection tube extends from the upper end inside the sheath tube to the side of the sheath tube, reducing the area of the deck above the sheath tube that the injection tube occupies, making it easier to apply even when the deck is thin.

It is also preferable that the exhaust flow path of the exhaust pipe extends from the upper end inside the sheath tube to the side of the sheath tube.

With this configuration, the exhaust flow path of the exhaust pipe extends from the upper end inside the sheath tube to the side of the sheath tube, reducing the area of the deck above the sheath tube that the exhaust pipe occupies, making it easier to apply even when the deck is thin.

The grout filling method and grout filling structure of the present invention allow for proper grout filling while reducing work on the top surface of the deck.

FIG. 2 is a longitudinal cross-sectional view of the grout-filled structure of the embodiment. (A) is a side view of the sheath tube with injection tube in Figure 1, (B) is a plan view of (A), (C) is a back view of (A), (D) is a front view of (A), (E) is a vertical cross-sectional view of (A) taken by alpha rays, (F) is a vertical cross-sectional view of (B) taken by beta rays, and (G) is a vertical cross-sectional view of (A) taken by gamma rays. 2A is a side view of the sheath tube with an exhaust pipe in FIG. 1, (B) is a plan view of (A), (C) is a rear view of (A), (D) is a front view of (A), (E) is a vertical cross-sectional view taken along line δ of (A), (F) is a vertical cross-sectional view taken along line ε of (B), and (G) is a vertical cross-sectional view taken along line ζ of (A). FIG. 2A is a longitudinal cross-sectional view showing the state when grout leaks out of the injection pipe after injection in FIG. 2E, and FIG. 2B is a longitudinal cross-sectional view showing the state when grout leaks out of the injection pipe after injection in FIG. 2G.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the grout-filled structure 1 of this embodiment includes a deck 2 having an upper surface 3 and a lower surface 4, a sheath tube 100 embedded in the deck 2 and containing PC steel 5 therein, an injection tube 111 that communicates with the upper end of the inside of the sheath tube 100 from the lower surface 4 of the deck 2 and injects grout G into the inside of the sheath tube 100, and exhaust pipes 121, 131 that communicate with the lower surface 4 of the deck 2 from the upper end of the inside of the sheath tube 100 and exhaust from the inside of the sheath tube 100. The PC steel 5 is a tension material that applies tension to prestressed concrete (PC). Grout is a fluid liquid such as a cement (mortar) system that is filled to fill the gap between the sheath tube and the PC steel.

The grout filling structure 1 and grout filling method of this embodiment are applied, for example, when grout G is filled inside the sheath tube 100 containing the PC steel 5 after the prestressed concrete constituting the deck 2 is tensioned by the PC steel 5, in order to prevent corrosion of the PC steel 5 and ensure the ultimate strength performance through adhesion.

The sheath pipe 100 near one of the fixing devices 6 of the PC steel material 5 has a sheath pipe with injection pipe 110 including an injection pipe 111. The fixing device 6 near the sheath pipe with injection pipe 110 is covered with a grout cap 7. The sheath pipe 100 near the other fixing device 6 of the PC steel material 5 has a sheath pipe with exhaust pipe 130 including an exhaust pipe 131. The sheath pipe 100 has a sheath pipe with exhaust pipe 120 including an exhaust pipe 121 between the sheath pipe with injection pipe 110 and the sheath pipe with exhaust pipe 130.

In the grout filling method in the grout filling structure 1 of this embodiment, an injection process is performed in which grout G is injected into the inside of the sheath tube 100 through the injection tube 111 that communicates with the upper end of the inside of the sheath tube 100 from the lower surface 4 of the deck slab 2. The filling of the grout G is confirmed in a confirmation hole provided at the upper end of the grout cap 7. The confirmation hole is then closed. In addition, in the grout filling method in the grout filling structure 1 of this embodiment, an exhaust process is performed in which exhaust is performed from the inside of the sheath tube 100 through exhaust pipes 121, 131 that communicate with the lower surface 4 of the deck slab 2 from the upper end of the inside of the sheath tube 100. The exhaust pipes 121, 131 that communicate with the lower surface 4 of the deck slab 2 confirm the discharge of grout G after the exhaust from the inside of the sheath tube 100 is completed. The injection pipe 111 and the exhaust pipes 121, 131 are closed, and curing and post-processing are performed until the grout G hardens.

As shown in Figures 2(A), 2(B), 2(C), 2(D), 2(E), 2(F) and 2(G), in the sheath tube with injection pipe 110, the injection flow path 115 of the injection pipe 111 passes from the underside 4 of the deck slab 2 through an upper position 116 that is higher than the upper end 113 of the inside 112 of the sheath tube with injection pipe 110, passes from the upper position 116 through a lower position 117 that is lower than the lower end 114 directly below the upper end 113 of the inside 112 of the sheath tube with injection pipe 110, and then passes from the lower position 117 through the upper position 116 to the upper end 113 of the inside 112 of the sheath tube with injection pipe 110.

Passing through an upper position 116 higher than the upper end 113 of the inside 112 of the sheath tube 110 with the injection tube means, for example, that the lower end of the injection flow path 115 passes through an upper position 116 higher than the upper end 113. Also, passing through a lower position 117 lower than the lower end 114 directly below the upper end 113 of the inside 112 of the sheath tube 110 with the injection tube means, for example, that the upper end of the injection flow path 115 passes through a lower position 117 lower than the lower end 114. Note that the number of times that the injection flow path 115 of the injection tube 111 passes through the upper position 116 and the lower position 117 before reaching the upper end 113 of the inside 112 of the sheath tube 110 with the injection tube from the lower surface 4 of the deck 2 may be two or more.

The injection flow passage 115 of the injection pipe 111 is wound around the outside of the injection pipe-attached sheath pipe 110, and communicates with the upper end 113 of the inside 112 of the injection pipe-attached sheath pipe 110 from the underside 4 of the deck slab 2 via the upper position 116, from the upper position 116 to the lower position 117, and from the lower position 117 to the upper position 116. The injection flow passage 115 of the injection pipe 111 may be wound around the outside of the injection pipe-attached sheath pipe 110 one or more times, or may be wound two or more times.

The injection flow passage 115 of the injection tube 111 extends from the upper end 113 of the interior 112 of the sheath tube with injection tube 110 to the side of the sheath tube with injection tube 110. Extending to the side includes, for example, extending upward from the upper end 113 of the interior 112 of the sheath tube with injection tube 110 to a range not exceeding twice the outer diameter of the injection tube 111, and then extending to the side of the sheath tube with injection tube 110.

Also, as shown in Figures 3(A), 3(B), 3(C), 3(D), 3(E), 3(F) and 3(G), in the exhaust pipe-equipped sheathed tube 120, the exhaust flow path 125 of the exhaust pipe 121 passes from the upper end 123 of the inside 122 of the exhaust pipe-equipped sheathed tube 120 through an upper position 126 that is higher than the upper end 123 of the inside 122 of the exhaust pipe-equipped sheathed tube 120, then passes through a lower position 127 that is lower than the lower end 124 directly below the upper end 123, passes from the lower position 127 through the upper position 126, and then communicates from the upper position 126 to the underside 4 of the deck slab 2.

Passing through an upper position 126 higher than the upper end 123 of the inside 122 of the sheathed tube 120 with an exhaust pipe means, for example, that the lower end of the exhaust flow path 125 passes through an upper position 126 higher than the upper end 123. Also, passing through a lower position 127 lower than the lower end 124 of the inside 122 of the sheathed tube 120 with an exhaust pipe means, for example, that the upper end of the exhaust flow path 125 passes through a lower position 127 lower than the lower end 124. Also, the number of times that the exhaust flow path 125 of the exhaust pipe 121 passes through the upper position 116 and the lower position 117 from the upper end 113 of the inside 112 of the sheathed tube 110 with an injection pipe to the lower surface 4 of the deck 2 may be two or more times.

The exhaust flow path 125 of the exhaust pipe 121 is wound around the outside of the exhaust pipe-attached sheath pipe 120, and passes from the upper end 123 of the interior 122 of the exhaust pipe-attached sheath pipe 120 through the upper position 126, then through the lower position 127, from the lower position 127 through the upper position 126, and from the upper position 126 it communicates with the underside 4 of the deck slab 2. The number of times that the exhaust flow path 125 of the exhaust pipe 121 winds around the outside of the exhaust pipe-attached sheath pipe 120 may be one or more times, or may be two or more times.

The exhaust flow path 125 of the exhaust pipe 121 extends from the upper end 123 of the interior 122 of the exhaust pipe-equipped sheath tube 120 to the side of the exhaust pipe-equipped sheath tube 120. Extending to the side includes, for example, extending upward from the upper end 123 of the interior 122 of the exhaust pipe-equipped sheath tube 120 to a range not exceeding twice the outer diameter of the exhaust pipe 121, and then extending to the side of the exhaust pipe-equipped sheath tube 120. The above also applies to the exhaust pipe-equipped sheath tube 130 and the exhaust pipe 131 of the exhaust pipe-equipped sheath tube 130.

According to this embodiment, in the grout filling method for filling the inside of the sheath tube 100 that is embedded in the deck 2 and contains the PC steel material 5 inside, in the injection process, the grout G is injected into the inside of the sheath tube 100 through the injection tube 111 that communicates with the upper end 113 of the inside 112 of the sheath tube 110 with the injection tube from the underside 4 of the deck 2, and in the exhaust process, the inside of the sheath tube 100 is exhausted through the exhaust pipe 121 that communicates with the underside 4 of the deck 2 from the upper end 123 of the inside 122 of the sheath tube 120 with the exhaust pipe.

The injection pipe 111 injects grout G from the underside 4 of the deck 2, and the exhaust pipe 121 exhausts from the underside 4 of the deck 2, so that the work on the upper surface 3 of the deck 2 can be reduced. In addition, the injection pipe 111 injects grout G from the upper end 113 of the inside 112 of the injection pipe-attached sheath pipe 110, and the exhaust pipe 121 exhausts from the upper end 123 of the inside 122 of the exhaust pipe-attached sheath pipe 120. Therefore, even if grout G leaks from the injection pipe 111 or the exhaust pipe 121 for some reason after the injection and exhaust of grout G, air will stay in the injection pipe 111 or the exhaust pipe 121 near the upper ends 113, 123 of the insides 112, 122 of the injection pipe-attached sheath pipe 110 or the exhaust pipe 120, so that the air remaining inside the sheath pipe 100 that would be an obstacle to re-injection of grout G can be reduced.

In addition, even if bleeding occurs, water can be expelled to the injection pipe 111 or exhaust pipe 121 near the upper end 113, 123 of the inside 112, 122 of the injection pipe-attached sheath pipe 110 or the exhaust pipe-attached sheath pipe 120. Therefore, work on the upper surface 3 of the deck slab 2 can be reduced while appropriately filling the grout G.

In addition, according to this embodiment, in a grout-filled structure 1 that includes a deck 2, a sheath tube 100 that is embedded in the deck 2 and contains PC steel material 5 inside, an injection tube 111 that injects grout G into the inside of the sheath tube 100, and an exhaust pipe 121 that exhausts from the inside of the sheath tube 100, the injection tube 111 injects grout G from the underside 4 of the deck 2, and the exhaust pipe 121 exhausts from the underside 4 of the deck 2, so that work on the upper surface 3 of the deck 2 can be reduced.

In addition, the injection tube 111 injects grout G from the upper end 113 of the interior 112 of the sheath tube with injection tube 110, and the exhaust tube 121 exhausts from the upper end 123 of the interior 122 of the sheath tube with exhaust tube 120. Therefore, even if grout G leaks from the injection tube 111 or the exhaust tube 121 for some reason after the injection and exhaust of grout G, air will remain in the injection tube 111 or the exhaust tube 121 near the upper ends 113, 123 of the interiors 112, 122 of the sheath tube with injection tube 110 or the sheath tube with exhaust tube 120, reducing the amount of air remaining inside the sheath tube 100 that would hinder the re-injection of grout G.

In addition, even if breathing occurs, water can be expelled to the injection tube 111 or exhaust tube 121 near the upper end 113, 123 of the interior 112, 122 of the sheath tube with injection tube 110 or the sheath tube with exhaust tube 120.

Furthermore, the injection flow path 115 of the injection pipe 111 passes from the underside 4 of the deck 2 through an upper position 116 that is higher than the upper end 113 of the inside 112 of the injection pipe-attached sheath pipe 110, passes from the upper position 116 through a lower position 117 that is lower than the lower end 114 directly below the upper end 113 of the inside 112 of the injection pipe-attached sheath pipe 110, and then passes from the lower position 117 through the upper position 116 to communicate with the upper end 113 of the inside 112 of the injection pipe-attached sheath pipe 110, and the exhaust flow path 125 of the exhaust pipe 121 passes from the upper end 123 of the inside 122 of the exhaust pipe-attached sheath pipe 120 through the upper position 126, then passes through the lower position 127, passes from the lower position 127 through the upper position 126, and then passes through the upper position 126 to communicate with the underside 4 of the deck slab 2.

As a result, as shown representatively in the injection pipe 111 in Figures 4(A) and 4(B), even if grout G leaks from the injection pipe 111 or the exhaust pipe 121 after the injection and exhaust of grout G for some reason, the air stops near the upper positions 116, 126 of the injection pipe 111 or the exhaust pipe 121, and the air remaining inside the sheath pipe 100, which may hinder the re-injection of grout G, can be further reduced.

In addition, according to this embodiment, the injection flow path 115 of the injection tube 111 is wound around the outside of the injection tube-attached sheath tube 110, and is connected from the underside 4 of the deck 2 via the upper position 116, from the upper position 116 via the lower position 117, and from the lower position 117 via the upper position 116 to the upper end 113 of the interior 112 of the injection tube-attached sheath tube 110, so that the area of the deck 2 occupied by the injection tube 111 can be made small.

In addition, according to this embodiment, the exhaust flow path 125 of the exhaust pipe 121 is wound around the outside of the exhaust pipe-attached sheath pipe 120, and passes from the upper end 123 of the inside 122 of the exhaust pipe-attached sheath pipe 120 through the upper position 126, then through the lower position 127, from the lower position 127 through the upper position 126, and from the upper position 126 communicates with the underside 4 of the deck 2, so that the portion of the deck 2 that is occupied by the exhaust pipe 121 can be made small.

In addition, according to this embodiment, the injection flow path 115 of the injection tube 111 extends from the upper end 113 of the interior 112 of the injection tube-attached sheath tube 110 to the side of the injection tube-attached sheath tube 110, thereby reducing the area that the injection tube 111 occupies above the sheath tube 100 in the deck slab 2, making it easier to apply even when the deck slab 2 is thin.

In addition, according to this embodiment, the exhaust flow path 125 of the exhaust pipe 121 extends from the upper end 123 of the interior 122 of the exhaust pipe-equipped sheathed pipe 120 to the side of the exhaust pipe-equipped sheathed pipe 120, so the area that the exhaust pipe 121 occupies above the sheathed pipe 100 in the deck slab 2 is reduced, making it easier to apply even when the deck slab 2 is thin.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and may be embodied in various forms. For example, in the above embodiment, the injection flow path 115 of the injection tube 111 is wound around the outside of the injection tube-attached sheath tube 110, and the exhaust flow path 125 of the exhaust tube 121 is wound around the outside of the exhaust tube-attached sheath tube 120. However, for example, the injection flow path 115 of the injection tube 111 may not be wound around the outside of the injection tube-attached sheath tube 110, but may extend in a wavy manner to the side of the injection tube-attached sheath tube 110, and may be connected to the upper end 113 of the inside 112 of the injection tube-attached sheath tube 110 via the upper position 116 from the lower surface 4 of the deck 2, via the lower position 117 from the upper position 116, and via the upper position 116 from the lower position 117 to the upper position 116.

Also, for example, the exhaust flow path 125 of the exhaust pipe 121 may extend in a wavy manner to the side of the exhaust pipe sheath pipe 120 without winding around the outside of the exhaust pipe sheath pipe 120, so that it can connect from the upper end 123 of the inside 122 of the exhaust pipe sheath pipe 120 via the upper position 126, then via the lower position 127, from the lower position 127 to the upper position 126, and from the upper position 126 to the underside 4 of the deck slab 2.

Also, for example, the injection flow path 115 of the injection tube 111 may not extend from the upper end 113 of the inside 112 of the sheath tube with injection tube 110 to the side of the sheath tube with injection tube 110, but may extend upward in a range that exceeds twice the outer diameter of the injection tube 111. Also, for example, the exhaust flow path 125 of the exhaust tube 121 may not extend from the upper end 123 of the inside 122 of the sheath tube with exhaust tube 120 to the side of the sheath tube with exhaust tube 120, but may extend upward in a range that exceeds twice the outer diameter of the exhaust tube 121. Also, the number of injection tubes 111 and exhaust tubes 121, 131 can be changed arbitrarily.

1...grout-filled structure, 2...deck slab, 3...upper surface, 4...lower surface, 5...PC steel, 6...fixing device, 7...grout cap, 100...sheath pipe, 110...sheath pipe with injection pipe, 111...injection pipe, 112...interior, 113...upper end, 114...lower end, 115...injection flow path, 116...upper position, 117...lower position, 120...sheath pipe with exhaust pipe, 121...exhaust pipe, 122...interior, 123...upper end, 124...lower end, 125...exhaust flow path, 126...upper position, 127...lower position, 130...sheath pipe with exhaust pipe, 131...exhaust pipe, G...grout.

Claims (6)

A grout filling method for filling grout into a sheath pipe that is embedded in a deck slab and contains PC steel therein, comprising:
An injection process of injecting the grout into the inside of the sheath tube through an injection tube communicating with an upper end of the inside of the sheath tube from the lower surface of the deck;
an exhaust process of exhausting the inside of the sheath tube through an exhaust pipe communicating from the upper end of the inside of the sheath tube to the underside of the deck;
A grout filling method comprising: The floor slab and
A sheath tube that is embedded in the deck and contains PC steel therein;
an injection pipe that communicates with an upper end of the inside of the sheath pipe from the lower surface of the deck and injects grout into the inside of the sheath pipe;
an exhaust pipe that communicates with the lower surface of the deck from the upper end of the interior of the sheath tube and exhausts air from the interior of the sheath tube;
Equipped with
The injection flow path of the injection pipe passes from the lower surface of the deck through an upper position higher than the upper end of the interior of the sheath tube, passes from the upper position through a lower position lower than the lower end immediately below the upper end of the interior of the sheath tube, and communicates from the lower position to the upper end of the interior of the sheath tube;
A grout-filled structure in which the exhaust flow path of the exhaust pipe passes from the upper end of the interior of the sheath pipe to the lower position, from the lower position to the upper position, and from the upper position to the underside of the deck slab. The grout filling structure according to claim 2, wherein the injection flow path of the injection pipe is wound around the outside of the sheath pipe, and communicates from the lower surface of the deck via the upper position, from the upper position via the lower position, and from the lower position to the upper end of the interior of the sheath pipe. The grout-filled structure according to claim 2 or 3, wherein the exhaust flow path of the exhaust pipe is wound around the outside of the sheath pipe, and communicates from the upper end of the inside of the sheath pipe through the lower position, from the lower position through the upper position, and from the upper position to the lower surface of the deck slab. The grout-filled structure according to any one of claims 2 to 4, wherein the injection flow passage of the injection pipe extends from the upper end of the interior of the sheath pipe to the side of the sheath pipe. The grout-filled structure according to any one of claims 2 to 5, wherein the exhaust flow path of the exhaust pipe extends from the upper end of the interior of the sheath pipe to the side of the sheath pipe.

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