Grout filling method and grout filling structure

Abstract

To reduce work on the top of a slab while properly grouting.SOLUTION: There is provided a grout filling method for filling the interior of a sheath pipe 100 embedded in a floor slab 2 and containing PC steel 5 inside with grout G, in which: grout G is injected into the interior of sheath pipe 100 from the bottom surface 4 of the floor slab 2 via injection pipe 111 communicated to the top end 113 of the interior 112 of sheath pipe 110 with injection pipe, in an injection process; and exhaust is exhausted from the interior of the sheath pipe 100 via an exhaust pipe 121 communicated from the upper end 123 of the interior 122 of the sheath pipe 120 with the exhaust pipe to the bottom surface 4 of the floor slab 2, in an exhaust process. Since grout G is injected and exhausted from the bottom surface 4, work on the top surface 3 of the floor slab 2 can be reduced. Because grout G is injected from the upper end 113 and exhausted from the upper end 123, remaining air inside the sheath tube 100, which is an obstacle to reinjection of grout G, can be reduced. Thus, work on the top surface 3 of the floor slab 2 can be reduced while properly filling the grout G.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a grout filling method and a grout filling structure. [Background technology]

[0002] The prestressed concrete (PC) that constitutes the deck is tensioned by the PC steel. A sheath pipe that houses the PC steel, which is arranged inside the member as a duct for later insertion of the PC steel, is embedded in the deck. In order to prevent the PC steel from rusting and ensure the performance of the ultimate strength by adhesion, the inside of the sheath pipe that houses the PC steel is filled with grout, which is a fluid liquid such as cement (mortar), to fill the gap between the sheath pipe and the PC steel. For example, Patent Document 1 discloses a technology in which grout is filled from one end of a sheath pipe that is embedded in the deck and houses the PC steel inside. In the one disclosed in Patent Document 1, exhaust is performed from the inside of the sheath pipe through an exhaust pipe that communicates with the upper end of the inside of the sheath pipe and the upper surface of the deck. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4982666 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the above-mentioned technology, work such as checking the discharge of grout from the exhaust pipe must be done on the top surface of the deck, which means that other work cannot be done on the top surface of the deck. Therefore, there is a need for an improvement in the technology for filling grout inside the sheath pipe that is buried in the deck and contains the PC steel.

[0005] Therefore, an object of the present invention is to provide a grout filling method and a grout filling structure that can reduce work on the top surface of a deck while properly filling grout. [Means for solving the problem]

[0006] 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 inside, and includes an injection step of 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 step of evacuating 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.

[0007] According to this configuration, in a grout filling method for filling grout into a sheath tube that is embedded in a deck slab and contains PC steel members inside, in the injection step, grout is injected into the inside of the sheath tube through an injection pipe that communicates with the upper end of the inside of the sheath tube from the underside of the deck slab, and in the exhaust step, exhaust is performed from the inside of the sheath tube through an exhaust pipe that communicates with the underside of the deck slab from the upper end of the inside of the sheath tube. Because the injection pipe injects grout from the underside of the deck slab and the exhaust pipe exhausts from the underside of the deck slab, work on the upper surface of the deck slab can be reduced.

[0008] 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 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 re-injection of grout.

[0009] In addition, even if bleeding occurs, water can be expelled to the injection pipe or exhaust pipe near the upper end of the inside of the sheath pipe. Therefore, work on the upper surface of the deck can be reduced while appropriately filling the grout.

[0010] The present invention also relates to a grout-filled structure comprising a deck slab, a sheath tube embedded in the deck slab and containing PC steel inside, an injection tube connected from the underside of the deck slab to the upper end of the inside of the sheath tube and for injecting grout into the inside of the sheath tube, and an exhaust pipe connected from the upper end of the inside of the sheath tube to the underside of the deck slab and for exhausting air from inside the sheath tube, wherein the injection flow path of the injection pipe runs from the underside of the deck slab to an upper position higher than the upper end of the inside of the sheath tube, from the upper position to a lower position 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 runs from the upper end of the inside of the sheath tube to a lower position, from the lower position to an upper position, and connects from the upper position to the underside of the deck slab.

[0011] According to this configuration, in a grout-filled structure comprising a deck slab, a sheath pipe embedded in the deck slab and containing PC steel inside, an injection pipe for injecting grout into the inside of the sheath pipe, and an exhaust pipe for exhausting gas from inside the sheath pipe, the injection pipe injects grout from the underside of the deck slab and the exhaust pipe exhausts gas from the underside of the deck slab, thereby reducing work on the top surface of the deck slab.

[0012] 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 stays 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 re-injection of grout. In addition, even if bleeding occurs, water can be expelled to the injection pipe or exhaust pipe near the upper end inside the sheath pipe.

[0013] Furthermore, the injection flow path of the injection pipe runs from the underside of the deck slab through an upper position which is higher than the upper end of the inside of the sheath tube, then from the upper position through a lower position which is lower than the lower end just below the upper end of the inside of the sheath tube, and then 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 runs from the upper end of the inside of the sheath tube through a lower position, then from the lower position through an upper position, and then connects from the upper position to the underside of the deck slab.Therefore, even if grout leaks from the injection pipe or exhaust pipe after injection and exhaust of grout for some reason, the air will stop near the upper position of the injection pipe or exhaust pipe, further reducing the amount of air remaining inside the sheath pipe which would hinder the re-injection of grout.

[0014] In this case, it is preferable that the injection flow path of the injection pipe runs from the underside of the deck slab to an upper position by winding it around the outside of the sheath pipe.

[0015] With this configuration, the injection flow path of the injection pipe is wound around the outside of the sheath pipe, and communicates from the underside of the deck slab to an upper position, from the upper position to a lower position, and from the lower position to the upper end of the inside of the sheath pipe, thereby making it possible to reduce the area of ​​the deck slab occupied by the injection pipe.

[0016] In addition, it is preferable that the exhaust flow path of the exhaust pipe is wound around the outside of the sheath tube, passing from the upper end of the inside of the sheath tube to a lower position, from the lower position to an upper position, and then from the upper position to the underside of the deck slab.

[0017] With this configuration, the exhaust flow path of the exhaust pipe is wound around the outside of the sheath tube, passing from the upper end of the inside of the sheath tube to a lower position, from the lower position to an upper position, and then communicating from the upper position to the underside of the deck slab, so that the area of ​​the deck slab occupied by the exhaust pipe can be made small.

[0018] 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.

[0019] According to 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, thereby reducing the area of ​​the deck slab that the injection tube occupies above the sheath tube, making it easier to apply even when the deck slab is thin.

[0020] It is also preferable that the exhaust flow path of the exhaust pipe extends from an upper end portion inside the sheath tube to a side of the sheath tube.

[0021] According to 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, thereby reducing the area of ​​the deck slab that the exhaust pipe occupies above the sheath tube, making it easier to apply even when the deck slab is thin. Effect of the Invention

[0022] According to the grout filling method and grout filling structure of the present invention, it is possible to reduce work on the upper surface of the deck while properly filling grout. [Brief description of the drawings]

[0023] [Figure 1] FIG. 2 is a longitudinal cross-sectional view of the grout-filled structure of the embodiment. [Diagram 2] (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) by alpha rays, (F) is a vertical cross-sectional view of (B) by beta rays, and (G) is a vertical cross-sectional view of (A) by gamma rays. [Diagram 3] (A) 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). [Figure 4]2(A) is a longitudinal cross-sectional view showing the state when grout leaks out of the injection pipe after injection in FIG. 2(E), and FIG. 2(B) is a longitudinal cross-sectional view showing the state when grout leaks out of the injection pipe after injection in FIG. 2(G). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a 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 housing a PC steel member 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 member 5 is a tension member 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 member.

[0025] 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 ensure the performance of ultimate strength through corrosion prevention and adhesion of the PC steel 5.

[0026] The sheath pipe 100 in the vicinity of one of the fixing devices 6 of the PC steel members 5 has a sheath pipe with injection pipe 110 including an injection pipe 111. The fixing device 6 in the vicinity of the sheath pipe with injection pipe 110 is covered with a grout cap 7. The sheath pipe 100 in the vicinity of the other fixing device 6 of the PC steel members 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.

[0027] 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 communicating 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 the exhaust pipes 121, 131 communicating with the lower surface 4 of the deck slab 2 from the upper end of the inside of the sheath tube 100. In the exhaust pipes 121, 131 communicating with the lower surface 4 of the deck slab 2, the discharge of grout G after the exhaust from the inside of the sheath tube 100 is confirmed. The injection pipe 111 and the exhaust pipes 121, 131 are closed, and curing and post-treatment are performed until the grout G hardens.

[0028] 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 which is higher than the upper end 113 of the interior 112 of the sheath tube with injection pipe 110, from the upper position 116 through a lower position 117 which is lower than the lower end 114 directly below the upper end 113 of the interior 112 of the sheath tube with injection pipe 110, and from the lower position 117 through the upper position 116 to connect to the upper end 113 of the interior 112 of the sheath tube with injection pipe 110.

[0029] Passing through an upper position 116 higher than an upper end 113 of the interior 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 immediately below the upper end 113 of the interior 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 interior 112 of the sheath tube 110 with the injection tube from the lower surface 4 of the deck slab 2 may be two or more.

[0030] Injection flow path 115 of injection tube 111 is wound around the outside of injection tube-attached sheath tube 110, and thereby communicates with upper end 113 of interior 112 of injection tube-attached sheath tube 110 from underside 4 of deck slab 2 via upper position 116, from upper position 116 to lower position 117, and from lower position 117 to upper position 116. The number of times that injection flow path 115 of injection tube 111 winds around the outside of injection tube-attached sheath tube 110 may be one or more times, or may be two or more times.

[0031] Injection flow path 115 of injection tube 111 extends from upper end 113 of interior 112 of sheath tube with injection tube 110 to the side of sheath tube with injection tube 110. Extending to the side includes, for example, extending upward from upper end 113 of interior 112 of sheath tube with injection tube 110 by a distance not exceeding twice the outer diameter of injection tube 111, and then extending to the side of sheath tube with injection tube 110.

[0032] 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, 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.

[0033] Passing through an upper position 126 higher than an upper end 123 of the interior 122 of the exhaust pipe-equipped sheathed tube 120 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 a lower end 124 of the interior 122 of the exhaust pipe-equipped sheathed tube 120 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 interior 112 of the injection pipe-equipped sheathed tube 110 to the lower surface 4 of the deck slab 2 may be two or more times.

[0034] Exhaust flow path 125 of exhaust pipe 121 is wound around the outside of exhaust pipe-equipped sheath pipe 120, so that it passes from an upper end portion 123 of interior 122 of exhaust pipe-equipped sheath pipe 120 via upper position 126, then via lower position 127, from lower position 127 to upper position 126, and from upper position 126 to the underside 4 of the deck slab 2. The number of times that exhaust flow path 125 of exhaust pipe 121 winds around the outside of exhaust pipe-equipped sheath pipe 120 may be one or more times, or may be two or more times.

[0035] 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 by a distance 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.

[0036] According to this embodiment, in a grout filling method for filling the inside of a sheath tube 100 that is embedded in a deck slab 2 and contains PC steel 5 therein, in an injection process, grout G is injected into the inside of the sheath tube 100 through an injection tube 111 that communicates with the upper end 113 of the interior 112 of a sheath tube 110 with an injection tube from the underside 4 of the deck slab 2, and in an exhaust process, grout G is exhausted from the inside of the sheath tube 100 through an exhaust pipe 121 that communicates with the underside 4 of the deck slab 2 from the upper end 123 of the interior 122 of a sheath tube 120 with an exhaust pipe.

[0037] 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-equipped sheath pipe 110, and the exhaust pipe 121 exhausts from the upper end 123 of the inside 122 of the exhaust pipe-equipped sheath pipe 120. Therefore, even if the grout G leaks from the injection pipe 111 or the exhaust pipe 121 for some reason after the injection and exhaust of the grout G, air stays 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-equipped sheath pipe 110 or the exhaust pipe 120, so that the air remaining inside the sheath pipe 100, which may be an obstacle to re-injection of the grout G, can be reduced.

[0038] Even if bleeding occurs, water can be expelled to the injection pipe 111 or the exhaust pipe 121 near the upper end 113, 123 of the inside 112, 122 of the sheath pipe with injection pipe 110 or the sheath pipe with exhaust pipe 120. Therefore, the work on the upper surface 3 of the deck slab 2 can be reduced while the grout G is appropriately filled.

[0039] Furthermore, according to this embodiment, in a grout filling structure 1 comprising a deck slab 2, a sheath tube 100 embedded in the deck slab 2 and containing PC steel 5 inside, an injection tube 111 for injecting grout G into the inside of the sheath tube 100, and an exhaust pipe 121 for exhausting air from the inside of the sheath tube 100, the injection tube 111 injects grout G from the underside 4 of the deck slab 2, and the exhaust pipe 121 exhausts air from the underside 4 of the deck slab 2, thereby reducing work on the upper surface 3 of the deck slab 2.

[0040] In addition, since the injection pipe 111 injects grout G from the upper end 113 of the interior 112 of the sheath pipe 110 with the injection pipe, and the exhaust pipe 121 exhausts from the upper end 123 of the interior 122 of the sheath pipe 120 with the exhaust pipe, 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 remain in the injection pipe 111 or the exhaust pipe 121 near the upper ends 113, 123 of the interiors 112, 122 of the sheath pipe 110 with the injection pipe or the sheath pipe 120 with the exhaust pipe, it is possible to reduce the amount of air remaining inside the sheath pipe 100 that would hinder the re-injection of grout G.

[0041] Even if breathing occurs, water can be expelled to the injection tube 111 or the exhaust tube 121 near the upper ends 113, 123 of the interiors 112, 122 of the sheath tube 110 with the injection tube or the sheath tube 120 with the exhaust tube.

[0042] Furthermore, 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 which is higher than the upper end 113 of the interior 112 of the sheath tube 110 with the injection pipe, passes from the upper position 116 through a lower position 117 which is lower than the lower end 114 directly below the upper end 113 of the interior 112 of the sheath tube 110 with the injection pipe, and then passes from the lower position 117 through the upper position 116 to connect to the upper end 113 of the interior 112 of the sheath tube 110 with the injection pipe, and the exhaust flow path 125 of the exhaust pipe 121 passes from the upper end 123 of the interior 122 of the sheath tube 120 with the exhaust pipe through the upper position 126, then passes through the lower position 127, from the lower position 127 through the upper position 126, and connects from the upper position 126 to the underside 4 of the deck slab 2.

[0043] Therefore, as shown representatively in Figures 4(A) and 4(B) for the injection pipe 111, even if grout G leaks from the injection pipe 111 or the exhaust pipe 121 after injection and exhaust of the grout G for some reason, the air stops near the upper positions 116, 126 of the injection pipe 111 or the exhaust pipe 121, thereby further reducing the amount of air remaining inside the sheath pipe 100 that would hinder the re-injection of grout G.

[0044] 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 to the upper end 113 of the interior 112 of the injection tube-attached sheath tube 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, thereby making it possible to reduce the area of ​​the deck slab 2 occupied by the injection tube 111.

[0045] Furthermore, 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 portion 123 of the interior 122 of the exhaust pipe-attached sheath pipe 120 through an upper position 126, then through a lower position 127, 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, thereby making it possible to reduce the area of ​​the deck slab 2 occupied by the exhaust pipe 121.

[0046] 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 occupied by the injection tube 111 above the sheath tube 100 in the deck slab 2, making it easier to apply even when the deck slab 2 is thin.

[0047] Furthermore, 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 sheath tube 120 to the side of the exhaust pipe-equipped sheath tube 120, thereby reducing the area that the exhaust pipe 121 occupies above the sheath tube 100 in the deck slab 2, making it easier to apply even when the deck slab 2 is thin.

[0048] 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-equipped sheath tube 110, and the exhaust flow path 125 of the exhaust tube 121 is wound around the outside of the exhaust tube-equipped 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-equipped sheath tube 110, but may extend in a wavy manner to the side of the injection tube-equipped sheath tube 110, and may communicate with the upper end 113 of the inside 112 of the injection tube-equipped sheath tube 110 from the lower surface 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.

[0049] 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 communicates from the upper end 123 of the interior 122 of the exhaust pipe sheath pipe 120 via an upper position 126, then via a 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.

[0050] Furthermore, for example, injection flow path 115 of injection tube 111 may not extend from upper end 113 of interior 112 of injection tube-equipped sheath tube 110 to the side of injection tube-equipped sheath tube 110, but may extend upward within a range that exceeds twice the outer diameter of injection tube 111. Furthermore, for example, exhaust flow path 125 of exhaust tube 121 may not extend from upper end 123 of interior 122 of exhaust tube-equipped sheath tube 120 to the side of exhaust tube-equipped sheath tube 120, but may extend upward within a range that exceeds twice the outer diameter of exhaust tube 121. Furthermore, the numbers of injection tubes 111 and exhaust tubes 121, 131 can be changed arbitrarily. [Explanation of symbols]

[0051] 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...inside, 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...inside, 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

1. 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:

2. 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 an 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.

3. 3. 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 underside 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.

4. 4. The grout filling structure according to claim 2 or 3, wherein the exhaust flow path of the exhaust pipe is wound around the outside of the sheath tube, so as to communicate from the upper end of the interior of the sheath tube through the lower position, from the lower position through the upper position, and from the upper position to the underside of the deck slab.

5. The grout-filled structure according to any one of claims 2 to 4, wherein the injection passage of the injection pipe extends from the upper end of the interior of the sheath pipe to a side of the sheath pipe.

6. 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 a side of the sheath pipe.

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