Method for joining precast concrete members

Abstract

To provide a method of joining a precast concrete (PCa) member by which injection work of a grout material can be more suitably performed and the precast concrete (PCa) member can be joined by surely securing construction quality.SOLUTION: A method of joining a precast concrete member comprises: a cylindrical member arrangement step for installing a cylindrical member 51 extending in a vertical direction on an upper surface 1u of a lower precast concrete member 1 formed with a plurality of reinforcing bar insertion holes 11b so that reinforcing bar insertion holes 11a are opened on the upper surface 1u so as to communicate with the reinforcing bar insertion holes 11b; a joining precast concrete member arrangement step; an upper precast concrete member arrangement step; an upper and lower grouting material filling step of filling a grouting material into the reinforcing bar insertion hole 11a, the inside of the cylindrical member 51, and a reinforcement through hole 21a; a first joint forming step of forming a first joint 41; and a second joint forming step of forming a second joint 42.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a method for joining precast concrete members.

Background Art

[0002] Conventionally, as a method for joining upper and lower PCa columns (PCa members), a plurality of sleeves of mechanical joints are provided on the upper part of the lower PCa column (lower PCa member), and a lenticular PCa (panel zone PCa, joining PCa member) for a column-beam joint is installed above the lower PCa column. There is a method (column main reinforcement reverse insertion method) in which an upper PCa column (upper PCa member) with a plurality of main reinforcements protruding downward from the lower end is installed on the lenticular PCa.

[0003] In this method, a plurality of main reinforcements protruding downward from the lower end of the upper PCa column are inserted into a plurality of sheath pipes arranged inside the lenticular PCa and inserted into the sleeves of the mechanical joints of the lower PCa column.

[0004] For example, in Patent Document 1 below, a sleeve joint in which a reinforcing bar insertion port is formed so as to open upward is provided on a PC column member, and grout material is transmitted over the upper surface of the PC column member and poured into the sleeve joint from the reinforcing bar insertion port to fill the sleeve joint. A method has been proposed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the method described in Patent Document 1, there is a risk that the properties of the grout material may change due to the flow on the upper surface of the PC column member, and a method for more suitably injecting the grout material is desired.

[0007] Therefore, the present invention has been made in view of the above circumstances, and it is possible to more suitably perform the grout injection work, and it is possible to surely ensure the construction quality and join precast concrete (PCa) members, and a method for joining precast concrete members is provided.

Means for Solving the Problems

[0008] In order to achieve the above object, the present invention employs the following means. That is, the method for joining precast concrete members according to the present invention includes a cylindrical member arranging step of arranging a cylindrical member extending in the vertical direction on the upper surface of a lower precast concrete member in which a plurality of reinforcing bar insertion holes are formed so that a reinforcing bar insertion opening opens on the upper surface, so as to communicate with the reinforcing bar insertion opening; a joining precast concrete member arranging step of arranging a joining precast concrete member in which a plurality of reinforcing bar through holes penetrating in the vertical direction are formed so that the reinforcing bar through holes communicate with the inside of the cylindrical member; an upper precast concrete member arranging step of arranging an upper precast concrete member provided with a plurality of reinforcing bars so as to protrude downward from the lower surface, inserting the reinforcing bars into the reinforcing bar through holes, the inside of the cylindrical member, and the reinforcing bar insertion holes, and arranging the upper precast concrete member with an upper gap above the joining precast concrete member; an upper and lower grout filling step of filling the reinforcing bar insertion holes, the inside of the cylindrical member, and the reinforcing bar through holes with grout; a first joint forming step of filling the lower gap between the upper surface of the lower precast concrete member and the joining precast concrete member with the grout to form a first joint; and a second joint forming step of filling the upper gap with the grout to form a second joint. After the upper and lower grout filling step, the first joint forming step and the second joint forming step are performed separately to form the first joint and the second joint. In the first target formation step and the second target formation step, formwork is provided along the outer circumferences of the lower gap and the upper gap, respectively, and the grout material is injected from the injection ports formed in the respective formwork. do.

[0009] In the method for joining precast concrete members configured as described above, in the upper and lower grout material filling steps, the grout material flows through and fills the reinforcing bar insertion holes, the inside of the cylindrical members, and the reinforcing bar through holes. In the first joint forming step, the grout material flows through and fills the lower gap. In the second joint forming step, the grout material flows through and fills the upper gap. Since the grout material can flow separately through the filling portions of the reinforcing bar insertion holes, the inside of the cylindrical members, and the reinforcing bar through holes, the first joint, and the second joint, the grout material can be reliably filled, and the injection operation of the grout material can be performed more preferably.

[0010] Further, in the method for joining precast concrete members according to the present invention, an injection port for injecting the grout material into the reinforcing bar insertion holes, the inside of the cylindrical members, and the reinforcing bar through holes and a discharge port for discharging the excess grout material from the reinforcing bar insertion holes, the inside of the cylindrical members, and the reinforcing bar through holes may be provided one by one for each one of the reinforcing bar insertion holes.

[0011] In the method for joining precast concrete members configured as described above, the injection port for injecting the grout material and the discharge port for discharging the grout material are provided one by one for each one of the reinforcing bar insertion holes. Therefore, since the grout material can be filled in each one of the reinforcing bar insertion holes, the grout material can be more reliably filled and the injection operation of the grout material can be performed more preferably than in the case of filling all the plurality of reinforcing bar insertion holes at once.

[0012] Further, in the method for joining precast concrete members according to the present invention, the injection port and the discharge port may be provided in the lower precast concrete member.

[0013] In the method for joining precast concrete members configured as described above, the injection port and the discharge port are provided in the lower precast concrete member in which the reinforcing bar insertion holes are formed. Therefore, the distance from the injection port and the discharge port to the reinforcing bar insertion holes is shortened, and the flow distance of the grout material can be shortened, so that the injection operation of the grout material can be performed more preferably.

Advantages of the Invention

[0014] According to the method for joining precast concrete members according to the present invention, the grout material can be more suitably injected, and the construction quality can be surely ensured to join the precast concrete (PCa) members.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0016] The method for joining precast concrete members according to one embodiment of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are diagrams showing a method for joining precast concrete members according to an embodiment of the present invention. FIG. 2 shows a subsequent process of the process shown in FIG. 1. As shown in FIG. 1, the structure joined by the method for joining precast concrete members according to the present embodiment is a column 100. The column 100 includes a lower PCa column (lower precast concrete member) 1, a lintel PCa (joining precast concrete member) 2, and an upper PCa column (upper precast concrete member) 3.

[0017] The lower PCa column 1, the lintel PCa 2, and the upper PCa column 3 are made of precast concrete.

[0018] At the upper part of the lower PCa column 1, a plurality of sleeves (mechanical joints) 11 are embedded. The sleeve 11 is formed in a substantially cylindrical shape with its axial direction oriented vertically. The lower end of the sleeve 11 is closed by a bottom 11c. The inside of the sleeve 11 is a reinforcing bar insertion hole 11a. At the upper part of the sleeve 11, a reinforcing bar insertion opening 11b that becomes larger in the radial direction as it goes upward is formed. The reinforcing bar insertion opening 11b opens toward the upper surface 1u of the lower PCa column 1.

[0019] A through hole 11d penetrating vertically is formed in the bottom 11c of the sleeve 11. A column main reinforcing bar (reinforcing bar) 12 extending from the lower part of the lower PCa column 1 is inserted through the through hole 11d. The upper end 12u of the column main reinforcing bar 12 reaches the middle part in the vertical direction of the sleeve 11.

[0020] At the lower part of the sleeve 11 of the lower PCa column 1, one end of a grout material inflow path 14 is provided so as to communicate with the reinforcing bar insertion hole 11a of the sleeve 11. The other end of the grout material inflow path 14 is an injection port 14a where the end opening to the side of the sleeve 11 is located.

[0021] At the upper part of the sleeve 11 of the lower PCa column 1, one end of a grout material outflow path 15 is provided so as to communicate with the reinforcing bar insertion hole 11a of the sleeve 11. The other end of the grout material outflow path 15 is a discharge port 15a where the end opening to the side of the sleeve 11 is located.

[0022] The grout material inflow path 14 and the grout material outflow path 15 are provided corresponding to each sleeve 11. In other words, one grout material inflow path 14 and one grout material outflow path 15 are provided for each sleeve 11.

[0023] On the upper surface 1u of the lower PCa column 1, a cylindrical partition valve (cylindrical member) 51 is provided so as to communicate with the reinforcing bar insertion opening 11b. The cylindrical partition valve 51 is formed in a substantially cylindrical shape with its axial direction oriented vertically. The cylindrical partition valve 51 is arranged coaxially with the sleeve 11.

[0024] The bellows PCa2 is arranged above the lower PCa column 1 with a gap (lower gap) s1 left. The lower surface 2d of the bellows PCa2 is installed on the upper surface of the cylindrical partition valve 51. The height of the gap s1 is substantially the same as the height of the cylindrical partition valve 51. As shown in FIG. 2, the gap s1 is filled with grout material outside the cylindrical partition valve 51 to form a lower joint (first joint) 41. The height of the gap s1 and the lower joint 41 is about 20 mm.

[0025] As shown in FIG. 1, a plurality of sheath pipes 21 are embedded in the bellows PCa2. The sheath pipe 21 is formed in a substantially cylindrical shape with its axial direction oriented vertically. The upper end portion of the sheath pipe 21 is closed by a top portion 21c. The sheath pipe 21 is arranged coaxially with the cylindrical partition valve 51 and the sleeve 11 of the lower PCa column 1. The inside of the sheath pipe 21 is a reinforcing bar through-hole 21a that penetrates vertically.

[0026] A through-hole 21d that penetrates vertically is formed in the top portion 21c of the sheath pipe 21. A column main reinforcing bar 31, which will be described later, is inserted into the through-hole 21d.

[0027] The upper PCa column 3 is arranged above the bellows PCa2 with a gap (upper gap) s2 left. As shown in FIG. 2, the gap s2 is filled with grout material to form an upper joint (second joint) 42. The height of the gap s2 and the upper joint 42 is about 20 mm.

[0028] As shown in FIG. 1, a plurality of column main reinforcing bars (reinforcing bars) 31 of the upper PCa column 3 protrude downward from the lower surface 3d of the upper PCa column 3. The column main reinforcing bars 31 are inserted into the reinforcing bar through-hole 21a of the sheath pipe 21, the inside of the cylindrical partition valve 51, and the reinforcing bar insertion hole 11a of the sleeve 11. The lower end portion 31d of the column main reinforcing bar 31 reaches the intermediate portion in the vertical direction of the sleeve 11. The lower end portion 31d of the column main reinforcing bar 31 is arranged slightly above the upper end portion 12u of the column main reinforcing bar 12.

[0029] As shown in Fig. 2, a grout filling portion 43 filled integrally with grout is formed in the reinforcing bar through hole 21a of the sheath tube 21 of the bellows PCa2, inside the cylindrical partition valve 51, the reinforcing bar insertion hole 11a of the sleeve 11 of the lower PCa column 1, the grout inflow path 14, and the grout outflow path 15.

[0030] Next, a method for joining precast concrete members will be described. First, a cylindrical member placement step is performed. The cylindrical partition valve 51 is installed on the upper surface 1u of the lower PCa column 1 so as to communicate with the reinforcing bar insertion port 11b of the sleeve 11.

[0031] Next, a precast concrete member placement step for joining is performed. The bellows PCa2 is placed on the cylindrical partition valve 51 so that the reinforcing bar through hole 21a of the sheath tube 21 communicates with the inside of the cylindrical partition valve 51. A gap s1 is formed between the lower PCa column 1 and the bellows PCa2. If the cylindrical partition valve 51 has a half-cut shape or the like, after the bellows PCa2 is installed in the precast concrete member placement step for joining, a cylindrical member installation step may be performed in which the cylindrical partition valve 51 is installed so as to surround the column main reinforcing bar 31 exposed in the gap s1.

[0032] Next, an upper precast concrete member placement step is performed. The upper PCa column 3 is placed above the bellows PCa2 with a gap s2 left by inserting the column main reinforcing bar 31 of the upper PCa column 3 into the reinforcing bar through hole 21a of the sheath tube 21 of the bellows PCa2, inside the cylindrical partition valve 51, and the 11a of the sleeve 11 of the lower PCa column 1.

[0033] Next, an upper and lower grout filling step is performed. Grout is injected from the injection port 14a. The grout flows through the grout inflow path 14, the reinforcing bar insertion hole 11a of the sleeve 11, the inside of the cylindrical partition valve 51, the reinforcing bar through hole 21a of the sheath tube 21, and the grout outflow path 15 and is filled. The excess grout is discharged from the discharge port 15a.

[0034] Next, a first target formation step is performed. Along the outer periphery of the gap s1, a formwork 53 is provided. Grout material is injected from an injection port (not shown) formed in the formwork 53. The grout material is filled in the outer portion of the cylindrical partition valve 51 in the gap s1, and the lower target 41 is formed.

[0035] Next, a second target formation step is performed. Along the outer periphery of the gap s2, a formwork 54 is provided. Grout material is injected from an injection port (not shown) formed in the formwork 54. The grout material is filled in the gap s2, and the upper target 42 is formed.

[0036] In the joining method of the precast concrete member configured as described above, in the upper and lower grout filling steps, the grout material flows through the reinforcing bar insertion holes 11a of the sleeve 11, the inside of the cylindrical partition valve 51, and the reinforcing bar through holes 21a of the sheath pipe 21 and is filled. In the first target formation step, the grout material flows through the gap s1 and is filled, and the lower target 41 is formed. In the second target formation step, the grout material flows through the gap s2 and is filled, and the upper target 42 is formed. Since the grout material can flow through the grout filling portions 43 of the reinforcing bar insertion holes 11a of the sleeve 11, the inside of the cylindrical partition valve 51, and the reinforcing bar through holes 21a of the sheath pipe 21, the first target 41, and the second target 42 separately, the grout material can be surely filled, and the injection work of the grout material can be performed more preferably.

[0037] Also, an injection port 14a for injecting the grout material and a discharge port 15a for discharging the grout material are provided one by one with respect to the reinforcing bar insertion hole 11a of one sleeve 11. Therefore, since the grout material can be filled in each of the reinforcing bar insertion holes 11a of one sleeve 11, the grout material can be surely filled and the injection work of the grout material can be performed even more preferably than when filling all the plurality of reinforcing bar insertion holes 11a at once.

[0038] In addition, the grout injection port 14a and the discharge port 15a are provided in the lower PCa column 1 where the reinforcing bar insertion hole 11a of the sleeve 11 is formed. Therefore, the distances of the grout inflow path 14 and the grout outflow path 15 from the injection port 14a and the discharge port 15a to the reinforcing bar insertion hole 11a are shortened, and the flow distance of the grout can be shortened. Thus, the grout injection work can be performed more preferably.

[0039] In addition, the various shapes, combinations, etc. of the respective constituent members shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

[0040] For example, in the above-described embodiment, the upper PCa column 3 is installed above the lower PCa column 1 via the connecting PCa 2. However, the upper part of the upper PCa column 3 may be configured like the lower PCa column 1, and the upper PCa column 3 (the upper part is configured like the lower PCa column 1) may be further installed above via the connecting PCa 2.

Explanation of Reference Numerals

[0041] 1 Lower PCa column (lower precast concrete member), 2 Connecting PCa (precast concrete member for joining), 3 Upper PCa column (upper precast concrete member), 11a Reinforcing bar insertion hole, 11b Reinforcing bar insertion port, 14a Injection port, 15a Discharge port, 21a Reinforcing bar through hole, 41 First joint, 42 Second joint, 51 Cylindrical member, s1, S2 Gap

Claims

1. A cylindrical member arranging step of arranging a cylindrical member extending in the vertical direction on the upper surface of a lower precast concrete member in which a plurality of reinforcing bar insertion holes are formed so that a reinforcing bar insertion opening opens on the upper surface, so as to communicate with the reinforcing bar insertion opening; A joining precast concrete member arranging step of arranging a joining precast concrete member in which a plurality of reinforcing bar through holes penetrating in the vertical direction are formed so that the reinforcing bar through holes communicate with the inside of the cylindrical member; An upper precast concrete member arranging step of arranging an upper precast concrete member provided with a plurality of reinforcing bars so as to protrude downward from the lower surface, inserting the reinforcing bars into the reinforcing bar through holes, the inside of the cylindrical member, and the reinforcing bar insertion holes, and arranging the upper precast concrete member with an upper gap above the joining precast concrete member; An upper and lower grout material filling step of filling the reinforcing bar insertion holes, the inside of the cylindrical member, and the reinforcing bar through holes with a grout material; A first joint forming step of filling the lower gap between the upper surface of the lower precast concrete member and the joining precast concrete member with the grout material to form a first joint; A second joint forming step of filling the upper gap with the grout material to form a second joint, comprising: After the upper and lower grout material filling step, the first joint forming step and the second joint forming step are performed separately to form the first joint and the second joint; In the first joint forming step and the second joint forming step, formwork is provided along the outer periphery of the lower gap and the upper gap, respectively, and the grout material is injected from an injection port formed in each formwork. A method for joining precast concrete members.

2. The injection port for injecting the grout material into the reinforcing bar insertion holes, the inside of the cylindrical member, and the reinforcing bar through holes and the discharge port for discharging the surplus grout material from the reinforcing bar insertion holes, the inside of the cylindrical member, and the reinforcing bar through holes are provided one by one for each reinforcing bar insertion hole. The method for joining precast concrete members according to Claim 1.

3. The injection port and the discharge port are provided in the lower precast concrete member. The method for joining precast concrete members according to Claim 2.

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