PC member joining method, PC member joining structure, and grout filling method

Abstract

To enable grout filling to be efficiently executed when PC members are joined.SOLUTION: A PC member joining method joins a first PC member having a first lateral face from which reinforcement protrudes sideways and a second PC member, which is provided on lateral side of the first PC member, has a second lateral face facing the first lateral face, and is provided with a sheath pipe for allowing the reinforcement to be inserted so that an opening on one end of the sheath pipe is exposed on the second lateral face. The PC member joining method comprises: an installation step to install the first PC member and the second PC member so that the reinforcement is inserted into the sheath pipe and a joint is formed between the first lateral face and the second lateral face; and a grout filling step to continuously fill grout into the joint and the sheath pipe by injecting the grout into the joint so as to make the grout flow from the joint into the sheath pipe.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a PC member joining method for joining PC members by filling them with grout, a PC member joining structure, and a grout filling method. [Background technology]

[0002] Patent Document 1 discloses a construction method for constructing a frame structure by moving a precast concrete (PC) beam member 100 laterally and joining it to a PC joint 104 of a PC column member 102, as shown in an example in Figure 1. In this conventional construction method, the beam portion 200 in Figure 1 is also a PC member, but the following discussion will assume that at least the beam end portion of the beam portion 200 is constructed with cast-in-place concrete. The PC beam member 100 has main beam reinforcement 106 protruding from one end face, and a rebar insertion port 101 exposed at the other end face for inserting the PC beam member 100. In addition, a sheath tube 112 for inserting the main beam reinforcement 106 is provided at the PC joint portion 104, and an opening 112a at the end of the sheath tube 112 is exposed on the side face.

[0003] The PC beam member 100 having the above configuration is moved laterally as shown by the arrow X, and erected so that the main beam reinforcement 106 penetrates the sheath pipe 112 provided in the PC joint portion 104 and protrudes from the opposite surface of the PC joint portion 104.

[0004] Then, grout is filled into the sheath tube 112 of the PC joint portion 104, and grout is filled into the joint between the side of the PC joint portion 104 and the end face of the PC beam member 100, thereby joining the PC beam member 100 and the PC joint portion 104. Thereafter, concrete is poured into the cast-in-place portion of the beam portion 200 to construct the beam portion 200. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-225897 Summary of the Invention [Problem to be solved by the invention]

[0006] As mentioned above, when joining rebars protruding from the side of a PC member (corresponding to the end face of the beam in the above construction method) by inserting them into sheath pipes attached to the PC member to be joined, it is necessary to inject grout into the joints between the PC members and into the sheath pipes. If these grout injections were to be carried out in separate processes, it would increase the number of man-hours and reduce construction efficiency, which was an issue.

[0007] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to enable efficient grout filling when joining PC members. [Means for solving the problem]

[0008] In order to achieve this object, the present invention provides a method for joining a first PC member having a first side surface from which reinforcing bars protrude laterally, and a second PC member provided on the side of the first PC member, having a second side surface opposite the first side surface, and having a sheath tube into which the reinforcing bars are inserted, with an opening at one end of the sheath tube exposed on the second side surface, the method comprising: an installation step of installing the first PC member and the second PC member such that the reinforcing bars are inserted into the sheath tube and a joint is formed between the first side surface and the second side surface; and a grout filling step of injecting grout into the joint and allowing the grout to flow from the joint into the sheath tube, thereby continuously filling the joint and the sheath tube with grout.

[0009] In the present invention, in the installation process, the first PC member and the second PC member may be installed so that the reinforcing bars pass through the sheath tube and protrude into a cast-in-place area provided on the opposite side of the second PC member from the second side.

[0010] Alternatively, in the installation step, the first PC member and the second PC member may be installed so that the reinforcing bars do not protrude from the second PC member and are housed within the sheath tube.

[0011] In addition, a grout injection passage may be formed in at least one of the first and second PC members, with one end opening to the opposing side surfaces of the first and third PC members and the other end opening to a surface other than the opposing side surface of at least one of the PC members or to the outside of at least one of the PC members, and in the grout filling process, grout may be injected into the joint through the grout injection passage.

[0012] In this case, the grout injection passage may open on the side surface at a position lower than the center of the joint in the height direction. In the present invention, the first PC member may constitute a PC beam, and the second PC member may constitute a PC joint.

[0013] The present invention also includes a joint structure formed by the above-described method for joining PC members. The present invention also provides a method for filling grout at a joint between a first PC member having a first side surface from which reinforcing bars protrude laterally, and a second PC member provided on the side of the first PC member, having a second side surface facing the first side surface and forming a joint between the first side surface and the second PC member, and having a sheath tube into which the reinforcing bars are inserted, with an opening at one end of the sheath tube exposed at the second side surface, in which grout is injected into the joint and allowed to flow from the joint into the sheath tube, thereby filling the joint and the sheath tube continuously with grout. [Effects of the Invention]

[0014] According to the present invention, grout filling can be carried out efficiently when joining PC members. [Brief explanation of the drawings]

[0015] [Figure 1] This is a diagram illustrating a conventional construction method for building a frame structure by joining PC beam members to PC joints. [Figure 2] 1A to 1C are diagrams illustrating a method for joining PC members according to a first embodiment of the present invention. [Figure 3] 10A to 10C are diagrams illustrating a method for joining PC members according to a second embodiment of the present invention. [Figure 4] 10A to 10C are diagrams illustrating a method for joining PC members according to a third embodiment of the present invention. [Figure 5] 10A to 10C are diagrams illustrating a method for joining PC members according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the first embodiment, as in the conventional construction method shown in Fig. 1 described above, the PC beam member 100 and the PC joint portion 104 are joined by filling them with grout. Note that the PC joint portion 104 is a part of the PC column member 102, but it may also be a PC joint member independent of the column.

[0017] FIG. 2 is a diagram for explaining this embodiment, showing a cross section of a joint between a PC beam member 100 and a PC joint portion 104. As shown in FIG. As explained with reference to Fig. 1, beam main reinforcements 106 protrude from the end face of the PC beam member 100. Although Fig. 2 shows two beam main reinforcements 106, an upper end reinforcement 106a and a lower end reinforcement 106b, multiple upper end reinforcements 106a and multiple lower end reinforcements 106b (for example, five) are provided in the beam width direction (depth direction of the page). Furthermore, the upper end reinforcements 106a and the lower end reinforcements 106b may each be provided in multiple rows (for example, two rows) above and below.

[0018] Furthermore, the length of protrusion of the beam main reinforcement 106 from the PC beam member 100 is set to a length such that the tip of the beam main reinforcement 106 reaches the inside of a sleeve joint 208 provided in the cast-in-place area, which will be described later. A sheath tube 112 for inserting the beam main reinforcement 106 is provided penetrating horizontally in the PC joint section 104, and openings 112a, 112b at the ends of the sheath tube 112 (hereinafter referred to as sheath openings 112a, 112b) are exposed on both sides.

[0019] To join the PC beam member 100 and the PC connection portion 104, the PC beam member 100 is moved laterally toward the PC connection portion 104, as shown by arrow X in Figure 1. As a result, as shown in Figure 2, the main beam reinforcement 106 protruding from the end face of the PC beam member 100 penetrates the sheath pipe 112 of the PC connection portion 104 and protrudes from the right side in the figure, and a joint 110 is formed between the left side in the figure of the PC connection portion 104 and the end face of the PC beam member 100. In this embodiment and other embodiments described later, a PC beam member is the object to be joined, and the "end face" of the PC beam member corresponds to the "side face" of the present invention.

[0020] As shown in Figure 2, a grout injection passage 116 is provided inside the PC beam member 100. Both ends of the grout injection passage 116 open to the top surface and end surface of the PC beam member 100, respectively. The opening of the grout injection passage 116 on the top surface of the PC beam member 100 serves as an injection port 116a for injecting grout. Furthermore, the opening of the grout injection passage 116 on the end surface of the PC beam member 100 serves as an inlet 116b through which grout flows from the grout injection passage 116 into the joint 110.

[0021] The position of the inlet 116b is preferably below the center position in the height direction of the PC beam member 100 (i.e., the height direction of the joint 110), and more preferably, as low as possible within a range that does not have a structural impact on the lower end reinforcement 106b.

[0022] The grout injection passage 116 is formed by pouring concrete with a hose installed inside the formwork during the production of the PC beam member 100. Other passages (grout discharge passage 118 and grout injection passage 119) in the PC member in this embodiment and the following embodiments are also formed in the same manner.

[0023] An outlet 112c is provided on the side of the sheath pipe 112 near the sheath opening 112b on the side where the beam main reinforcement 106 protrudes (the right side in the figure). In addition, a grout discharge passage 118 is provided inside the PC joint 104. One end of the grout discharge passage 118 is connected to the outlet 112c, and the other end opens to the surface of the PC joint 104 or the PC column member 102. The opening of the grout discharge passage 118 on the surface of the PC joint 104 or the PC column member 102 serves as an outlet 118a for confirming that the sheath pipe 112 has been filled with grout. The same number of grout discharge passages 118 as the sheath pipes 112 are provided to correspond to each sheath pipe 112.

[0024] After the PC beam member 100 is erected in the state shown in FIG. 2, grout filling work is carried out. First, a joint formwork 120 is installed around the entire periphery of the joint 110 (i.e., all four sides of the PC beam member 100) to seal the joint 110. In addition, the periphery of the beam main reinforcement 106 is sealed with a sealing material 122 at the sheath opening 112b of the sheath pipe 112.

[0025] Next, grout is injected into the grout injection passage 116 from the injection port 116a. The grout injected into the grout injection passage 116 flows into the joint 110 from the inlet 116b and fills it, and then flows from the joint 110 into the sheath pipe 112 through the lower sheath opening 112a and flows inside the sheath pipe 112 to the right in Figure 2. Furthermore, when the level of the grout injected into the joint 110 rises and reaches the height of the upper sheath opening 112a, the grout also flows into the upper sheath pipe 112 and flows inside the sheath pipe 112 to the right in Figure 2.

[0026] The grout that has flowed into the sheath tubes 112 fills the gaps around the beam main reinforcement bars 106, and once filled into the sheath tubes 112, the ends of the sheath tubes 112 are sealed with the sealing material 122, so the grout flows from the outlets 112c through the grout discharge passages 118 and out from the outlets 118a. When the grout has flowed out from the outlets 118a corresponding to all the sheath tubes 112, it can be confirmed that all the sheath tubes 112 have been filled with grout. The timing at which the grout starts to flow out of the outlets 118a differs depending on the outlets 118a, but the outlets 118a from which the outflow of grout has been confirmed are successively and quickly sealed.

[0027] Once it has been confirmed that the grout has been filled in this way, the injection of grout from the injection port 116a into the grout injection passage 116 is stopped, and the injection port 116a is sealed. Then, after a predetermined grout hardening time has elapsed, the joint formwork 120 and the sealant 122 are removed.

[0028] As a result, the main beam reinforcement 106 inside the sheath tube 112 is fixed to the PC joint section 104 by the grout, and the PC beam member 100 and the PC joint section 104 are integrated through the grout in the joint 110, thereby joining the PC beam member 100 and the PC joint section 104.

[0029] As shown in Figure 2, when the PC beam member 100 and the PC connection portion 104 are joined, the beam main reinforcement 106 protrudes from the side of the PC connection portion 104 opposite the PC beam member 100 (the right side in the figure). In this state, for example, as shown by the two-dot chain line in Figure 2, the tip of the beam main reinforcement 106 is connected to the beam main reinforcement 206 on the beam portion 200 side by a joint such as a sleeve joint 208, and the concrete that makes up the beam portion 200 is poured in place to construct a structure in which the PC beam member 100, the PC connection portion 104, and the beam portion 200 are integrated.

[0030] As described above, according to this embodiment, grout is injected into the joint 110 through the grout injection passage 116, and then injected from the joint 110 into the sheath pipe 112. In other words, the grout filling into the joint 110 and the sheath pipe 112 is performed in one continuous process. This reduces the construction time required for grout filling compared to when the grout filling into the joint 110 and the sheath pipe 112 is performed in separate processes, and allows the joining work of the PC beam member 100 and the PC connection portion 104 to be performed efficiently.

[0031] Furthermore, the grout inlet 116b from the grout injection passage 116 to the joint 110 opens into the joint 110 at a position lower than the center position in the height direction of the PC beam member 100 (i.e., the height direction of the joint 110), so the grout is mainly filled from the bottom up in the joint 110. This makes it difficult for air to get mixed into the grout filled into the joint 110, improving the filling properties of the grout.

[0032] In addition, in this embodiment, by providing a grout discharge passage 118 corresponding to each of the multiple sheath tubes 112, it is possible to reliably confirm that all the sheath tubes 112 have been filled with grout by checking that the grout has flowed out from all the outlets 118a.

[0033] In this embodiment, the grout injection passage 116 is provided in the PC beam member 100, but it may also be provided in the PC joint portion 104 with both ends opening into the surface of the PC joint portion 104 or the PC column member 102, and grout may be injected through these openings, or it may be provided in both the PC beam member 100 and the PC joint portion 104.

[0034] 3 is a diagram showing a second embodiment of the present invention. In this embodiment, instead of the PC beam 100 in the first embodiment, a PC beam 150, which is a half PC member with upper end bars 106a and the upper half of the stirrups 107 exposed at the top, is used as the joining object. Therefore, only the lower end bars 106b protrude from the end face of the PC beam 150.

[0035] In this embodiment, as in the first embodiment, a grout injection passage 116 is provided in the PC beam member 150, and a grout discharge passage 118 is provided in the PC joint portion 104, which is connected to the outlets 112c of the upper and lower sheath pipes 112. Furthermore, in this embodiment, an inlet 112d is provided in each side of the upper sheath pipe 112 near the end opposite the outlet 112c (left side in the figure), and a grout injection passage 119 is provided in the PC joint portion 104, one end of which is connected to the inlet 112d and the other end of which opens as an injection port 119a on the surface of the PC joint portion 104 or the PC column member 102.

[0036] When joining a PC beam member 150 and a PC joint portion 104, first, the PC beam member 150 is erected so that the lower end reinforcement 106b protruding from the PC beam member 150 is inserted into the lower sheath pipe 112 provided in the PC joint portion 104 and protrudes from the sheath pipe 112, and a joint 110 is formed between the end face of the PC beam member 150 and the side surface of the PC joint portion 104.

[0037] Next, the entire periphery of the joint 110 between the end face of the PC beam member 150 and the side of the PC joint portion 204 is sealed with a joint formwork 120, and the periphery of the lower end reinforcement 106b at the sheath opening 112b on the side of the lower sheath tube 112 where the lower end reinforcement 106b protrudes (the right side in Figure 2) is sealed with a sealing material 122.

[0038] Then, grout is injected into the joint 110 from a grout injection passage 116 provided in the PC beam member 150. The injected grout flows from the joint 110 into the sheath pipe 112 below the PC connection portion 104. When the sheath pipe 112 is filled with grout, the grout flows out from the outlet 112c into the grout discharge passage 118, and when it flows out to the outside from the outlet 118a, it is confirmed that the sheath pipe 112 has been filled with grout. When the grout has flowed out from the outlets 118a of all the grout discharge passages 118, it is confirmed that the joints 110 and all the sheath pipes 112 below have been filled with grout.

[0039] For the upper sheath tube 112, grout is injected into the grout injection passage 119 from the injection port 119a, and the grout flows into the sheath tube 112. When the sheath tube 112 is filled with grout, similarly to the lower sheath tube 112, the grout flows out from the outlet 112c to the grout discharge passage 118, and when the grout has flowed out to the outside from all the outlets 118a, it is confirmed that all the upper sheath tubes 112 have been filled with grout.

[0040] After that, after the predetermined grout hardening time has passed, the joint formwork 120 and sealing material 122 are removed, and the PC beam member 100 and the PC joint portion 104 are joined. As shown by the dotted line in Figure 3, the main beam reinforcement 106 is connected to the main beam reinforcement 206 on the beam portion 200 side using a joint such as a sleeve joint 208, and the concrete that makes up the beam portion 200 is poured in place, thereby creating an integrated structure of the PC beam member 150, the PC joint portion 104, and the beam portion 200.

[0041] In the first and second embodiments described above, since grout is filled into a sheath pipe that extends long in the horizontal direction, if the fluidity of the grout is too low, there is a risk that good grout filling properties will not be obtained. Therefore, in each of the above embodiments, grout with a relatively large flow value (for example, a flow value of 180 to 330 mm) is used. However, the flow value of the grout in the present invention is not limited to this.

[0042] In the first and second embodiments, the beam main reinforcements 106 (upper end reinforcements 106a, lower end reinforcements 106b) penetrate the sheath pipe 112 of the PC joint 104 and protrude, and concrete is poured into the protruding area. However, the present invention is not limited to this. As shown in the third and fourth embodiments in Figures 4 and 5, the beam main reinforcements 106 may not protrude from the PC joint 104 but may be housed within the sheath pipe 112, and the entire cross section of the right end of the sheath pipe 112 in the figure may be sealed with a sealing material 124. This type of configuration is applicable, for example, when the PC column member 102 is located on the outer periphery of a beam-column frame, a beam is provided on only one side of the PC column member 102, and there is no area for pouring concrete into the opposite side of the PC beam member 100.

[0043] In each of the above embodiments, one end of the grout injection passages 116, 119 and the grout discharge passage 118 opens onto the surface of the PC member, but the hoses that make up these passages may protrude from the surface of the PC member to the outside, with their tips serving as injection ports 116a, 119a and outlet port 118a.

[0044] In addition, in the first to fourth embodiments, the case of joining a PC beam and a PC joint has been described, but the joining objects of the present invention are not limited to these, and can be applied to the case of joining a PC member with reinforcing bars protruding from the side and a PC member with a sleeve joint for connecting the reinforcing bars. For example, it can also be applied to the case of joining PC floor members and PC wall members. [Explanation of symbols]

[0045] 100, 150 PC beam members 102 PC pillar member 104 PC joint 106 Main beam reinforcement 106a Upper end muscle 106b Lower end reinforcement 107 Stifles 110 Joint 112 Sheath tube 112a, 112b sheath opening 112c Outlet 112d Inlet 116 Grout injection passage 116a Inlet 116b Inlet 118 Grout discharge passage 118a Outlet 119 Grout injection passage 119a Inlet 120 Joint formwork 122, 124 Sealing material

Claims

1. a first PC member having a first side surface from which a reinforcing bar protrudes laterally; a second PC member provided on a side of the first PC member, having a second side surface facing the first side surface, and having a sheath tube into which the reinforcing bar is inserted, with an opening at one end of the sheath tube exposed to the second side surface; A method for joining PC members, comprising: An installation process of installing the first PC member and the second PC member so that the reinforcing bar is inserted into the sheath tube and a joint is formed between the first side surface and the second side surface; a grout filling step of continuously filling the joint and the sheath pipe with grout by injecting grout into the joint and allowing the grout to flow from the joint into the sheath pipe; A method for joining PC members comprising:

2. The joining method for PC members according to claim 1, In the installation step, the first PC member and the second PC member are installed so that the reinforcing bar penetrates the sheath pipe and protrudes into a cast-in-place area provided on the opposite side of the second PC member from the second side surface. Method for joining PC components.

3. The joining method for PC members according to claim 1, In the installation step, the first PC member and the second PC member are installed so that the reinforcing bars do not protrude from the second PC member and are housed within the sheath tube. Method for joining PC components.

4. The joining method for PC members according to any one of claims 1 to 3, a grout injection passage is formed in at least one of the first and second PC members, the grout injection passage having one end opening to the opposing side surfaces of the first and third PC members and the other end opening to a surface other than the opposing side surfaces of the at least one PC member or to the outside of the at least one PC member; In the grout filling step, grout is injected into the joint through the grout injection passage. Method for joining PC components.

5. The joining method for PC members according to claim 4, The grout injection passage opens to the side surface at a position lower than the center of the joint in the height direction. Method for joining PC components.

6. The method for joining PC members according to any one of claims 1 to 3, wherein the first PC member constitutes a PC beam and the second PC member constitutes a PC joint portion.

7. A joint structure of PC members obtained by joining PC members using the method according to any one of claims 1 to 3.

8. a first PC member having a first side surface from which a reinforcing bar protrudes laterally; a second PC member provided on a side of the first PC member, having a second side surface facing the first side surface and forming a joint between the first side surface and the second PC member, and having a sheath tube into which the reinforcing bar is inserted, with an opening at one end of the sheath tube exposed to the second side surface; 1. A method for filling grout in a joint comprising: Grout is injected into the joint and allowed to flow from the joint into the sheath pipe, thereby continuously filling the joint and the sheath pipe with grout. Grout filling method.

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