Grout filling method

Abstract

When joining a beam member to a precast concrete column member from the side, it is possible to confirm that grout is evenly filled into the joint, and the grout can be easily filled. [Solution] Multiple beam reinforcement joints 54 are embedded in the beam member 5, and one end 52s of the main beam reinforcement 52 and the main beam reinforcement 27A and 27B for joining the column member 2 are inserted into each beam reinforcement joint 54. A connecting passage 58 is formed in the beam member 5 that extends from the internal space of the beam reinforcement joint 54 to surfaces 51s and 51t other than the end face 5f and communicates with the outside. The grout filling method includes a joint formwork installation step of installing a joint formwork 90 so as to close the lower and side of the joint space ZS between the beam member 5 and the column member 2, and a grout filling step of injecting grout G into one connecting passage 58C to start filling (arrow DR1), and then stopping the filling of grout G after it is confirmed that the grout G has been discharged from all connecting passages 58 other than the one connecting passage 58C (arrow DR5).

Description

Technical Field

[0001] The present invention relates to a grout filling method for filling grout into a joint portion between a column member and a beam member made of precast concrete.

Background Art

[0002] When constructing a building structure, in order to reduce the construction period, it is widely practiced to manufacture column members and beam members as precast concrete structures in a factory, transport them to the construction site, and assemble them. In a member made of precast concrete, a joint member such as a mechanical joint into which one end of a main reinforcement is inserted may be embedded at the end of the member.Facing such a joint member, the reinforcement bars of the member to be joined are inserted from the outside, and the members are joined by filling grout into the joint member. Regarding the filling of this grout, for example, in Patent Document 1, a column joint portion of a PCa horizontal structure in which a column joint portion and a beam are integrated is directly joined to a lower floor PCa column and an upper floor PCa column. The column connection reinforcement of the column main reinforcement of the upper floor PCa column penetrates through the through hole of the column joint portion and is inserted into the column joint member of the lower floor PCa column. A configuration is disclosed in which the upper and lower floor PCa columns are arranged vertically via the column joint portion at the column-beam joint portion. In this configuration, lower joints and upper joints are respectively formed at the lower end and the upper end of the column joint portion. Then, after filling the column joint member installed at the column head portion of the lower floor PCa column and into which the column connection reinforcement of the upper floor PCa column is inserted with grout and curing it, by supplying the grout to the lower joint of the column joint portion, the grout is sequentially and continuously filled into the lower joint, the through hole communicating with the lower joint, and the upper joint communicating with this through hole.

[0003] Furthermore, Patent Document 2 discloses a configuration in which an intermediate member made of precast concrete with through holes is placed on the upper surface of a concrete lower member with a gap between them, and the area around this gap is sealed with a sealing member to form a lower joint space, and an upper member made of precast concrete is placed on the upper surface of the intermediate member with a gap between them, and the lower member, intermediate member and upper member are connected via reinforcing bars that pass through the through holes, and the area around this gap is sealed with a sealing member to form an upper joint space, and grout is supplied to the lower joint space to fill the lower joint space, the through holes and the upper joint space with grout, and air inside the upper joint space is exhausted through a plurality of air vents that penetrate from the lower surface of the upper member to the outside of the upper member.

[0004] Furthermore, Patent Document 3 discloses a configuration in which, at the joint between a lower column member having multiple sleeve joints embedded in concrete with their upper ends exposed on the upper surface, and an upper column member having multiple upper column main reinforcements protruding downward from the lower surface of the concrete, the upper column member is positioned at a predetermined location to secure a joint of a predetermined width between it and the lower column member, and the upper column main reinforcements are joined to the lower column main reinforcements when the grout filled in the sleeve joints hardens. In this configuration, a concrete member is prepared which has multiple holes that open to the joint surface with other members and have grout injection ports, and which has grout injection passages that lead from an outer surface different from the joint surface to multiple grout injection ports via multiple branching sections. After inserting the reinforcing bars of other members into the holes, a nozzle pipe is inserted into the grout injection passage from the outer side, and with the nozzle positioned at a location corresponding to each branching section, grout is discharged from the nozzle into the grout injection passage.

[0005] The above-mentioned Patent Documents 1 to 3 mainly describe cases where precast concrete column members are joined to each other, or where precast concrete column members and column-beam joint members are joined in the vertical direction. These Patent Documents 1 to 3 may also be applicable when a precast concrete beam member is joined to a precast concrete column member from the side. In Patent Document 1, a lower joint and an upper joint are formed between the lower column and the column joint, and between the column joint and the upper column, respectively. The lower joint and the upper joint are connected by multiple through-holes that penetrate the column joint vertically. In this configuration, grout is injected and filled from the lower joint side through the through-holes to the upper joint side. The grout filling is stopped when the discharge of grout from a discharge pipe connected to the upper joint is confirmed. In this configuration, it is not possible to confirm whether the grout has been evenly filled into each of the multiple through-holes in the column joint, or throughout the entire lower and upper joints. In Patent Document 2, as in Patent Document 1, it is not possible to confirm whether the grout has been evenly filled into the joint. Therefore, even if patent documents 1 and 2 are applied to a precast concrete column member when joining a precast concrete beam member from the side, it is not possible to confirm whether grout has been evenly filled into the joint.

[0006] In contrast, Patent Document 3 describes a configuration in which sleeve joints are embedded in the upper surface of a lower column member with their upper ends exposed, and grout injection passages are provided to connect to the grout injection ports of these multiple sleeve joints. In this configuration, grout is injected and filled into each of the multiple sleeve joints from the grout injection passages. Furthermore, it is possible to confirm that the grout has been evenly filled by confirming that the grout has been discharged from the upper end of each sleeve joint. However, in Patent Document 3, it is necessary to confirm that the grout has been discharged from the upper end of the sleeve joints by looking into the joint from the outside of the joint formed between the lower and upper column members, which is not easy to confirm. In addition, in Patent Document 3, multiple grout injection passages are provided, and grout must be injected and filled into each of these multiple grout injection passages, which is not easy to do. Therefore, even if such Patent Document 3 is applied when joining a precast concrete beam member to a precast concrete column member from the side, it is difficult to easily fill the grout. When joining a beam member to a precast concrete column member from the side, there is a need for a grout filling method that allows for confirmation that grout is evenly filled into the joint and that allows for easy grouting. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2006-144251 [Patent Document 2] Japanese Patent Publication No. 2011-226069 [Patent Document 3] Japanese Patent Publication No. 2017-96059 [Overview of the project] [Problems that the invention aims to solve]

[0008] The problem that this invention aims to solve is to provide a grout filling method that allows for confirmation that grout is evenly filled into the joint when joining a beam member to a precast concrete column member from the side, and that allows for easy grout filling. [Means for solving the problem]

[0009] To solve the above problems, the present invention employs the following means. In other words, the grout filling method of the present invention is a grout filling method for filling grout into the joint between a precast concrete column member and a beam member, wherein the column member has a protruding portion formed to protrude from the side surface of the column member, and the beam member is provided facing the column member with a space between the end face of the beam member and the tip face of the protruding portion, and recesses are formed in the tip face of the protruding portion and the end face of the beam member, and grout is filled into the joint space, wherein the grout is filled into the respective recesses of the tip face of the protruding portion and the end face of the beam member to form a cotter, and the grout filling is stopped after it is confirmed that the grout has been discharged from a passage that communicates with the joint space and extends to the surface of the beam member. In the configuration described above, recesses are formed at the tip of the protruding portion that extends from the side of the column member and at the end of the beam member. Grout is filled into each of these recesses, and cotters are formed in the joint. These cotters bear the shear force acting between the protruding portion, the recess, and the grout forming the joint. Furthermore, when filling the joint space with grout, it is possible to confirm that the grout has been evenly filled into the joint by stopping the grout filling process after confirming that the grout has been discharged from a connecting passage that extends from the joint space to the surface of the beam member. In this way, when joining a beam member to a precast concrete column member from the side, it becomes possible to confirm that the grout is evenly filled into the joint, and to realize a grout filling method that allows for easy grouting. Furthermore, it becomes possible to realize a structure that bears the shear force between the precast concrete column member and beam member.

[0010] In one embodiment of the present invention, in the column member, a plurality of connecting beam main reinforcements are provided protruding from the tip surface of the protruding portion, and in the beam member, a plurality of beam reinforcement joints formed in a cylindrical shape and having an internal space are embedded in the beam end, and the beam main reinforcement of the beam member and the connecting beam main reinforcement are joined by the beam reinforcement joints, the internal space of each of the beam reinforcement joints is in communication with the outside at the end surface of the beam member, and the communication passage is formed so as to extend from a through hole opened in each of the beam reinforcement joints to the surface other than the end surface, thereby connecting the internal space to the outside. With this configuration, when joining a beam member to a precast concrete column member from the side, it is possible to confirm that grout has been evenly filled into the joint, and it is also possible to easily fill the grout.

[0011] Furthermore, the grout filling method of the present invention is a grout filling method for filling the joint portion between a precast concrete column member and a beam member, wherein in the column member, a plurality of connecting beam main reinforcement bars are provided protruding from the side, and in the beam member, a plurality of beam reinforcement joint portions formed in a cylindrical shape and having an internal space are embedded at the beam end, and the beam main reinforcement bars of the beam member and the connecting beam main reinforcement bars are joined by the beam reinforcement joint portions, and the internal space of each of the beam reinforcement joint portions is in communication with the outside at the end face of the beam member, and a through hole opened in each of the beam reinforcement joint portions extends to a surface other than the end face, A passage is formed to connect the internal space to the outside, the beam members are provided facing each other with their end faces spaced apart so as to form a joint space with the column members, recesses are formed in the end faces of the column members and the beam members in the joint space, the grout is injected under pressure into one of the multiple passages to begin filling, and then, after it is confirmed that the grout has been discharged from all the passages other than the one, the grout filling is stopped, and at this time, the grout is filled into each of the recesses on the end faces of the column members and the beam members to form cotters, including a grout filling step. With this configuration, when joining a beam member to a precast concrete column member from the side, it becomes possible to confirm that the grout is evenly filled into the joint, and to realize a grout filling method that allows for easy grouting. Furthermore, it becomes possible to realize a structure that bears the shear force between the precast concrete column member and beam member.

[0012] Furthermore, the grout filling method of the present invention is a grout filling method for filling the joint portion between a precast concrete column member and a beam member, characterized in that a joint formwork is provided between the protruding portion of the column member and the end face of the beam member to seal the lower and side of the joint space, and a space is formed in which the joint space, the internal space of a plurality of beam reinforcement joints within the beam member, and the connecting passages communicating with each of the internal spaces are integrally connected, grout is injected by pressurizing from one of the plurality of connecting passages, and the injection is stopped after it is confirmed that the grout has been discharged from all of the other connecting passages. With this configuration, the method for grouting the joint between precast concrete column members and beam members involves creating a space through which a joint space sealed below and to the sides by joint formwork, an internal space for multiple beam reinforcement joints within the beam member, and a space through which connecting passages communicating with each internal space are integrally connected. Grout is then injected through one of the multiple connecting passages, and injection is stopped after it is confirmed that the grout has been discharged from all other connecting passages. This makes it possible to confirm that the grout is evenly filled into the joint and to realize a grout filling method that allows for easy grouting. [Effects of the Invention]

[0013] According to the present invention, when joining a beam member to a precast concrete column member from the side, it is possible to confirm that the grout is evenly filled into the joint and to easily fill the grout. Furthermore, it is possible to realize a structure that bears the shear force between the precast concrete column member and beam member. [Brief explanation of the drawing]

[0014] [Figure 1] This is a longitudinal cross-sectional view showing the configuration of a column-beam frame constructed by applying the grout filling method according to an embodiment of the present invention. [Figure 2] This is an enlarged longitudinal cross-sectional view of the area indicated by arrow A in Figure 1. [Figure 3]It is a longitudinal sectional view of the I-I arrow-view part in FIG. 2. [Figure 4] It is an enlarged longitudinal sectional view of the B-arrow-view part in FIG. 1. [Figure 5] It is a longitudinal sectional view showing a state in which one column member is installed when constructing the column-beam framework of FIG. 1. [Figure 6] It is a longitudinal sectional view showing a state in which the beam member is moved horizontally from the state shown in FIG. 5. [Figure 7] It is a partial longitudinal sectional view showing a state in which the beam member is moved horizontally and the end face of the beam member faces the tip face of the protrusion. [Figure 8] It is a plan view looking down from the upper side of the joint portion between the column member and the beam member. [Figure 9] It is a schematic diagram showing the flow of grout in the grout filling process. [Figure 10] It is a longitudinal sectional view showing another column member installation process.

Embodiments for Carrying Out the Invention

[0015] The present invention is a grout filling method for filling grout into the joint portion between a column member and a beam member. The grout filling method continuously fills the internal space of the beam reinforcement joint and the joint space provided in the joint portion between the column side surface of the column member and the material end surface of the beam member from below to above to form a joint. Specifically, the grout fills the internal space of the beam reinforcement joint having an injection port with a filling material and discharges it. At the same time, the grout overflowing from the beam reinforcement joint having an injection port is raised from below to above in the joint space, and the internal space of other beam reinforcement joints is continuously filled to form a joint. Hereinafter, with reference to the accompanying drawings, the embodiments for carrying out the grout filling method according to the present invention will be described based on the drawings. In the following, first, the configuration of the column-beam framework constructed by applying the grout filling method according to the embodiment of the present invention will be described, and then the construction method of the column-beam framework including the grout filling method will be described. A longitudinal sectional view showing the configuration of the above column-beam framework is shown in FIG. 1. As shown in Figure 1, the column-beam frame 1 comprises a plurality of columns 11 extending in the vertical direction and beams 12 installed between adjacent columns 11 in the horizontal direction. Each column 11 is constructed by connecting a plurality of column members 2 in the vertical direction. Each column member 2 is made of precast concrete and has a predetermined length in the vertical direction. Each column member 2 mainly comprises a concrete section 21, main reinforcement bars 22 embedded in the concrete section 21, and a reinforcement bar joint section 23. The concrete section 21 has, for example, a rectangular cross-sectional shape in plan view. Multiple main reinforcement bars 22 are embedded in the concrete section 21. The number and arrangement of the main reinforcement bars 22 are not limited in any way. The main reinforcement bars 22 extend vertically. The upper ends of the main reinforcement bars 22 protrude upward from the upper surface of the concrete section 21. The lower ends of the main reinforcement bars 22 are inserted into the upper part of the reinforcement bar joint section 23, which is embedded in the lower end of the column member 2.

[0016] The column reinforcement joint 23 is formed in a cylindrical shape and has an internal space. The column reinforcement joint 23 is positioned so that the axial direction of the cylinder coincides with the vertical direction. The column reinforcement joint 23 is embedded in the concrete section 21. The lower end of the column reinforcement joint 23 is exposed on the lower surface of the concrete section 21, and the internal space of the column reinforcement joint 23 opens downwards. Multiple such column members 2 are connected vertically to form a column 11. Column members 2 located above and below each other are joined by inserting the upper end of the main reinforcement bar 22 of the lower column member 2 into the internal space of the reinforcement bar joint 23 of the upper column member 2 from below, and filling the internal space of the reinforcement bar joint 23 with grout (not shown). In addition, a joint is formed between the concrete portion 21 of the lower column member 2 and the concrete portion 21 of the upper column member 2 by filling it with grout.

[0017] Figure 2 is an enlarged longitudinal cross-sectional view of the area indicated by arrow A in Figure 1. As shown in Figures 1 and 2, each column member 2 is provided with a projection 25 in the vertical direction on the portion facing the end face 5f of the beam member 5, which constitutes the beam 12, as will be described later. The projection 25 protrudes horizontally from the side surface 21s of the concrete portion 21 of the column member 2 toward the beam member 5. The projection 25 is formed integrally with the concrete portion 21. The shape of the projection 25 when viewed from the direction of projection is formed to match the shape of the beam member 5 when viewed from the direction of extension of the beam member 5. More specifically, the shapes of the projection 25 and the lower surface of the beam member 5 match when viewed from the direction of extension of the beam member 5. Also, the shapes of the projection 25 and the side surface of the beam member 5 match when viewed from the direction of extension of the beam member 5. Furthermore, in this embodiment, the shapes of the projection 25 and the upper surface of the beam member 5 match when viewed from the direction of extension of the beam member 5. Thus, the protruding portion 25 has the same shape as the end face 5f of the beam member 5. A recess 25d is formed in the center of the tip surface 25f of the protruding portion 25, so as to be recessed inward from the protruding portion 25, that is, in a direction away from the end surface 5f of the beam member 5. This recess 25d is filled with grout G, which will be used to form the joint Z described later, thereby forming a cotter that will bear the shear force acting between the protruding portion 25 and the grout G that will form the joint Z.

[0018] Furthermore, the column member 2 is provided with multiple connecting beam main reinforcement bars 27A and 27B that protrude from the side, more specifically from the tip surface 25f of the projection 25, toward the beam member 5. The multiple connecting beam main reinforcement bars 27A and 27B are provided so as to penetrate horizontally through the concrete portion 21 and the projection 25. The connecting beam main reinforcement bars 27A are provided at the same height as the upper beam main reinforcement bars 52A of the beam member 5, which will be described later. The connecting beam main reinforcement bars 27B are provided below the connecting beam main reinforcement bars 27A. The connecting beam main reinforcement bars 27B are provided at the same height as the lower beam main reinforcement bars 52B of the beam member 5, which will be described later. Several rib reinforcement bars 28 are embedded near the projection 25, arranged to surround the connecting beam main reinforcement bars 27A and 27B.

[0019] In this embodiment, each beam 12 comprises a beam member 5 and a cast-in-place concrete beam section 7. As shown in Figure 1, the beam member 5 is made of precast concrete, with one beam end 5s (one end of the beam member 5) directly joined to a column member 2A that forms the column 11 shown on the left in Figure 1, and the other beam end 5t (the other end of the beam member 5) joined to another column member 2B that forms the column 11 shown on the right in Figure 1 via a cast-in-place concrete beam section 7. As shown in Figures 1 and 2, the beam member 5 mainly consists of concrete 51, beam main reinforcement 52, beam rib reinforcement 53, and beam reinforcement joint section 54.

[0020] The concrete 51 has, for example, a rectangular cross-sectional shape when viewed from the direction of extension of the beam member 5. The concrete 51 integrally comprises a first concrete section 51A and a second concrete section 51B. The first concrete section 51A forms the concrete 51 on one beam end 5s side. The first concrete section 51A is provided at one beam end 5s of the beam member 5 so as to form the entire cross-section of the beam member 5. As shown in Figure 2, the first concrete section 51A has a through hole 51k formed in the center in the vertical direction, which penetrates the first concrete section 51A in the beam width direction (depth direction in Figure 2), allowing equipment piping and the like to be inserted. In the first concrete section 51A, a recess 51d is formed in the center of the end face 5f facing the tip face 25f of the protruding section 25, so as to be recessed inward from the first concrete section 51A, that is, in the direction away from the tip face 25f of the protruding section 25. This recess 51d is filled with grout G which will form the joint Z described later, and a cotter is formed to bear the shear force acting between the beam member 5 and the grout G which will form the joint Z. The second concrete section 51B forms the concrete 51 of the central part 5c of the beam and the other end 5t of the beam. The second concrete section 51B is provided only at the lower part of the beam member 5 in the central part 5c of the beam and the other end 5t of the beam in the direction of extension of the beam member 5.

[0021] Figure 3 is a longitudinal cross-sectional view of the area indicated by arrow II in Figure 2. As shown in Figures 2 and 3, the beam main reinforcement 52 comprises multiple upper beam main reinforcement 52A and multiple lower beam main reinforcement 52B. The beam main reinforcement 52 is provided in correspondence with each of the multiple connecting beam main reinforcement 27A and 27B. Each of the upper beam main reinforcement 52A and the lower beam main reinforcement 52B extends in the extension direction (horizontal direction) of the beam member 5. The lower beam main reinforcement 52B is provided below the upper beam main reinforcement 52A. The upper beam main reinforcement 52A is provided above the lower beam main reinforcement 52B. In this embodiment, the upper beam main reinforcement 52A and the lower beam main reinforcement 52B are each arranged in two upper and lower levels. In each level, multiple upper beam main reinforcement 52A and lower beam main reinforcement 52B are provided side by side in the beam width direction. In this embodiment, the diameter and strength of the upper beam main reinforcement 52A and the lower beam main reinforcement 52B are set to be smaller than the diameter and strength of the connecting beam main reinforcement 27A and 27B.

[0022] As shown in Figures 1 and 2, at one end 5s of the beam member 5, both the lower main beam reinforcement 52B and the upper main beam reinforcement 52A are embedded in the first concrete section 51A, forming a fully precast concrete structure. At the central section 5c and the other end 5t of the beam member 5, the lower main beam reinforcement 52B is embedded in the second concrete section 51B, while the upper main beam reinforcement 52A is exposed above the concrete 51, resulting in a half-precast concrete structure. Multiple sets of beam reinforcement bars 53 are provided at intervals in the direction of extension of the beam member 5. Each beam reinforcement bar 53 is provided so as to surround the upper beam main reinforcement bar 52A and the lower beam main reinforcement bar 52B.

[0023] The beam reinforcement joint 54 is formed in a cylindrical shape and has an internal space. The beam reinforcement joint 54 is positioned so that the axial direction of the cylinder coincides with the horizontal direction in which the beam member 5 extends. Multiple beam reinforcement joints 54 are embedded in the first concrete section 51A at one beam end 5s of the beam member 5. The beam reinforcement joints 54 are provided corresponding to each of the multiple main beam reinforcements 52, and at the same time, they are provided corresponding to each of the multiple connecting main beam reinforcements 27A, 27B. As shown in Figure 2, one end 52s of the main beam reinforcement bars 52 (upper main beam reinforcement bar 52A, lower main beam reinforcement bar 52B) embedded in the beam member 5 is inserted into the end of each of the multiple beam reinforcement bar joints 54 on the beam center 5c side (right side in Figure 2). The inner circumferential surface of the beam reinforcement bar joint 54 and the outer circumferential surface of the main beam reinforcement bars 52 are spaced apart in the radial direction of the beam reinforcement bar joint 54, creating a gap between them. Each of the multiple beam reinforcement joints 54 has an end on the beam end 5s side (left side in Figure 2) that is exposed to the end face 5f of the first concrete portion 51A (concrete 51) of the beam member 5, and the internal space of the beam reinforcement joint 54 opens horizontally and communicates with the outside. The ends of the corresponding connecting beam main reinforcements 27A and 27B are inserted into each of the beam reinforcement joints 54 from the beam end 5s side that opens horizontally and communicates with the outside. The inner circumferential surface of the beam reinforcement joint 54 and the outer circumferential surfaces of the connecting beam main reinforcements 27A and 27B are spaced apart in the radial direction of the beam reinforcement joint 54, creating a gap between them.

[0024] A through-hole 54h is provided in the beam reinforcement joint 54, penetrating in a direction perpendicular to the axial direction of the beam reinforcement joint 54, thereby connecting the internal space of the beam reinforcement joint 54 with the outside of the beam reinforcement joint 54. For each beam reinforcement joint 54, the through-hole 54h is provided at both ends in the axial direction of the beam reinforcement joint 54. Thus, in this embodiment, each beam reinforcement joint 54 is provided with two through-holes 54h. In particular, in this embodiment, one of the two through-holes 54h is opened in the axial direction of the beam reinforcement joint 54, in the area where a gap is formed between the inner surface of the beam reinforcement joint 54 and the outer surface of the beam main reinforcement 52 when one end 52s of the beam main reinforcement 52 is inserted. The other through-hole 54h is opened in the axial direction of the beam reinforcement joint 54, in the area where a gap is formed between the inner surface of the beam reinforcement joint 54 and the outer surface of the connecting beam main reinforcement 27A and 27B when the ends of the connecting beam main reinforcement 27A and 27B are inserted.

[0025] In the internal space of each beam reinforcement joint 54, grout G is filled into the gaps between the ends of the connecting beam main reinforcements 27A and 27B and one end 52s of the beam main reinforcement 52 (upper beam main reinforcement 52A, lower beam main reinforcement 52B), the gap between the inner circumferential surface of the beam reinforcement joint 54 and the outer circumferential surface of the beam main reinforcement 52, and the gap between the inner circumferential surface of the beam reinforcement joint 54 and the outer circumferential surfaces of the connecting beam main reinforcements 27A and 27B. Furthermore, the beam member 5 is positioned such that there is a predetermined gap between the end face 5f of one beam end 5s and the tip face 25f of the protruding portion 25 of the column member 2 that is opposite to the end face 5f, which will be explained later as a joint space ZS using Figure 9, etc. A joint Z is formed when grout G is filled into this joint space ZS, which is the gap between the end face 5f and the tip face 25f.

[0026] As described above, in order to fill with grout G, multiple connecting passages 58 are formed in the beam member 5, as shown in Figure 3. In this embodiment, the multiple connecting passages 58 are provided to correspond to all through holes 54h in all beam reinforcement joints 54. Therefore, in this embodiment, two connecting passages 58 are provided for each beam reinforcement joint 54. Each of the multiple connecting passages 58 is provided to communicate with a corresponding through-hole 54h. Each of the multiple connecting passages 58 is connected to a corresponding through-hole 54h. Each of the multiple connecting passages 58 is provided to extend from the through-hole 54h through the interior of the first concrete section 51A to surfaces 51s and 51t other than the end face 5f. The other end of each of the multiple connecting passages 58 is provided to open outwards from surfaces 51s and 51t other than the end face 5f. In this way, each of the multiple connecting passages 58 connects the internal space of the beam reinforcement joint section 54 to the outside of the beam member 5 via the corresponding through-hole 54h of the beam reinforcement joint section 54.

[0027] More specifically, in this embodiment, the internal space of the beam reinforcement joint 54 embedded below the first concrete section 51A is connected to the outside by a connecting passage 58 from the lateral surface 51s (i.e., the side surface) of the first concrete section 51A. The internal space of the beam reinforcement joint 54 embedded above the first concrete section 51A is connected to the outside by a connecting passage 58 from either the lateral surface 51s of the first concrete section 51A or the upward-facing surface 51t (i.e., the top surface) of the first concrete section 51A. Such a connecting passage 58 can be formed by embedding, for example, a pipe material such as a polyvinyl chloride pipe when pouring concrete to form the first concrete portion 51A of the beam member 5. As will be described in detail later, the grout G is filled into the internal space of the multiple beam reinforcement joints 54 from one of the multiple connecting passages 58, which is connected passage 58C (see Figure 2). After the internal space of the multiple beam reinforcement joints 54 is filled with grout G, each of the multiple connecting passages 58 is also filled with grout G.

[0028] The cast-in-place concrete beam section 7 comprises a first cast-in-place concrete section 71 formed between the other beam end 5t of the beam member 5 and another column member 2B, and a second cast-in-place concrete section 72 formed above the second concrete section 51B of the beam member 5. The first cast-in-place concrete section 71 and the second cast-in-place concrete section 72 are formed integrally. Figure 4 is an enlarged longitudinal cross-sectional view of the area indicated by arrow B in Figure 1. Multiple cylindrical beam reinforcement splices 59 are provided at the location of the protruding portion 25 of the other column member 2B, corresponding to each of the beam main reinforcements 52. The other end 52t of each of the upper beam main reinforcement 52A and the lower beam main reinforcement 52B is inserted into the end of each corresponding beam reinforcement splice 59 on the beam center portion 5c side. The ends of the connecting beam main reinforcements 27A and 27B, which are provided to protrude from the protruding portion 25 of the other column member 2B, are inserted into each of the multiple beam reinforcement splices 59. The first cast-in-place concrete section 71 is formed by pouring concrete on site to embed these upper beam main reinforcement 52A, lower beam main reinforcement 52B, and multiple beam reinforcement splices 59. The second cast-in-place concrete section 72 is formed by pouring concrete on-site at the central part 5c of the beam member 5 and the other end 5t of the beam, so as to embed the upper main beam reinforcement 52A on the second concrete section 51B.

[0029] In the configuration described above, the upper beam main reinforcement 52A and the lower beam main reinforcement 52B are joined to the connecting beam main reinforcement 27A and 27B of the column members 2A and 2B using beam reinforcement splices 54 and 59. Furthermore, as already explained, the diameter and strength of the upper beam main reinforcement 52A and the lower beam main reinforcement 52B are set to be smaller than the diameter and strength of the connecting beam main reinforcement 27A and 27B. In this way, when an earthquake occurs, the position where the plastic hinge occurs moves from the end position P1 of the beam 12 shown in Figure 1 to the end position P2 of the beam reinforcement splices 54 and 59 on the central side of the beam 12, towards the center of the beam 12. This achieves hinge relocation that keeps the column-beam joint within the elastic range.

[0030] Next, we will explain the method for constructing the column-beam frame 1 as described above. To construct the column-beam frame 1, the following steps are carried out on each floor. (Column member installation process) Figure 5 is a longitudinal cross-sectional view showing the state after one column member has been installed when constructing the column-beam frame shown in Figure 1. First, on each floor, one column member 2A is installed in a predetermined position as shown in Figure 5. At this time, if a column member 2A of a lower floor is already installed below the first column member 2A to be installed, the upper end of the main reinforcement bar 22 of the column member 2A of the lower floor is inserted from below into the lower part of the reinforcement bar joint portion 23 of the first column member 2A.

[0031] (Beam member installation process) Next, the beam member 5 is suspended and positioned at a location horizontally opposite to the protruding portion 25 of the first column member 2A. Figure 6 is a longitudinal cross-sectional view showing the state after the beam member has been moved laterally from the state shown in Figure 5. Figure 7 is a partial longitudinal cross-sectional view showing the state after the beam member has been moved laterally and the end face of the beam member is facing the tip face of the protruding part. Figure 8 is a top-down plan view of the joint between the column member and the beam member. Next, the beam member 5 is moved laterally, and the main beam reinforcement bars 27A and 27B protruding from the protruding portion 25 are inserted into each of the multiple beam reinforcement joint portions 54. Then, the beam member 5 is positioned so that the tip surface 25f of the protruding portion 25 of one column member 2A and the end surface 5f of the beam member 5 are separated by a predetermined gap, i.e., a joint space ZS. When the end surface 5f of the beam member 5 is positioned opposite the tip surface 25f of the protruding portion 25, the positions of the lower surface, both sides, and the upper surface of the protruding portion 25 and the beam member 5 are aligned when viewed from the direction of extension of the beam member 5. More specifically, the position of the beam member 5 is adjusted so that the lower surfaces of the protruding portion 25 and the beam member 5, and the sides of the protruding portion 25 and the beam member 5, each extend within the same plane.

[0032] Here, in order to form a joint space ZS, a joint width securing means 81 is provided on either the surface of the column member 2 (the tip surface 25f of the protruding portion 25) or the end surface 5f of the beam member 5, protruding by a predetermined length toward the other, and having a predetermined length, so as to maintain a constant width of the joint Z. In this embodiment, the joint width securing means 81 is formed by screwing a bolt that protrudes by a predetermined length toward the end surface 5f of the beam member 5 into an insert embedded in the protruding portion 25 of the column member 2. When the beam member 5 is moved laterally, the end surface 5f of the beam member 5 is brought into contact with the bolt serving as the joint width securing means 81, so that the tip surface 25f of the protruding portion 25 of one column member 2A and the end surface 5f of the beam member 5 face each other with a predetermined gap between them.

[0033] In this state, the column member 2 and the beam member 5 are joined by the separation suppression means 82. In this embodiment, the separation suppression means 82 includes, for example, an L-shaped fixing bracket 83 bolted to the upper and lower surfaces of the first concrete portion 51A of the beam member 5, and a bolt 84 connecting the fixing bracket 83 to the side surface 21s of the column member 2. Such separation suppression means 82 prevents the column member 2 and the beam member 5 from separating due to the pressure when grout G is later filled into the joint space ZS.

[0034] (Grout filling process) Next, grout G is filled into the joint space ZS between the tip surface 25f of the protruding portion 25 of one column member 2A and the end surface 5f of the beam member 5 to form a joint Z. First, a joint formwork 90 is installed to cover the joint space ZS from below and to the sides (joint formwork installation process). The joint formwork 90 is provided to cover the joint space ZS between the tip surface 25f of the protruding portion 25 of one column member 2A and the end surface 5f of the beam member 5 from below and on both sides. As described above, the position of the beam member 5 is aligned so that the lower surfaces of the protruding portion 25 and the beam member 5, and the side surfaces of the protruding portion 25 and the beam member 5, each extend within the same plane. Therefore, by providing the joint formwork 90 so that it extends within these planes, the joint formwork 90 can be easily installed.

[0035] Figure 9 is a schematic diagram showing the flow of grout in the grout filling process. Next, grout G is filled between the tip surface 25f of the protruding portion 25 of the column member 2A and the end surface 5f of the beam member 5 (grout filling process). In the state after the process of setting the joint formwork 90 as described above, the joint space ZS and the internal space of each beam reinforcement joint 54 are in communication because a gap is formed between the inner circumferential surface of the beam reinforcement joint 54 and the outer circumferential surface of the ends of the connecting beam main reinforcement bars 27A and 27B inserted into the beam reinforcement joint 54. In addition, the internal space of each beam reinforcement joint 54 is in communication with the outside from the surfaces 51s and 51t of the beam member 5 via the through hole 54h and the connecting passage 58 connected thereto. In this way, the joint space ZS, the internal space of each beam reinforcement joint 54, and the connecting passage 58 formed for each beam reinforcement joint 54 are all in communication, forming a single space. In this embodiment, conceptually, grout G is injected into an opening provided on the surface 51s, 51t of the beam member 5 in one of the multiple connecting passages 58, namely passage 58C, thereby filling all parts of the space that are connected as a single space with grout G. By continuing to inject grout G until it is discharged from the openings provided on the surface 51s, 51t of the beam member 5 in all connecting passages 58 other than passage 58C, it can be confirmed that the joint space ZS and the internal space of all beam reinforcement joints 54 are evenly filled with grout G.

[0036] More specifically, as shown in Figures 3 and 9, the filling process begins by press-injecting grout G into one of the multiple connecting passages 58, which is arbitrarily selected as a connecting passage 58C. In the example shown in Figure 3, the beam reinforcement joint 54 located at the bottom, on the right side of the drawing, is designated as one beam reinforcement joint 54C. As shown in Figure 9, one of the two connecting passages 58 provided for the beam reinforcement joint 54C is designated as one connecting passage 58C, and grout G is press-injected into this connecting passage 58C. The grout G is then first filled into the internal space of the beam reinforcement joint 54C via the connecting passage 58C, as indicated by the arrow DR1. The grout G then flows out from the internal space of one beam reinforcement joint 54C into the joint space ZS, as indicated by arrow DR2. At the same time, the grout G is discharged to the outside from the internal space of one beam reinforcement joint 54C through other connecting passages 58 provided in one beam reinforcement joint 54C, other than the one connecting passage 58C, as indicated by arrow DR3. If discharge of grout G to the outside from the connecting passage 58 is confirmed, the openings provided in the surfaces 51s and 51t of the beam member 5 in the connecting passage 58 are closed in order to suppress further discharge of grout G.

[0037] As described above, when grout G flows out from the internal space of one beam reinforcement joint 54C into the joint space ZS, the flowing grout G accumulates and fills the inside of the joint formwork 90 because the joint space ZS is blocked at the bottom and sides by the joint formwork 90. ​​As the filling of grout G into the inside of the joint formwork 90 progresses, the upper surface of the grout G in the joint space ZS rises and reaches the height where the other beam reinforcement joints 54 are located, other than the one beam reinforcement joint 54C. Then, as indicated by arrow DR4, the grout G flows into the internal space of the other beam reinforcement joint 54. The grout G that has flowed into the internal space of the other beam reinforcement joint 54 passes through the connecting passage 58 that communicates with the internal space of the other beam reinforcement joint 54, as indicated by arrow DR5, and is then discharged from the surfaces 51s and 51t of the beam member 5. Regarding the connecting passage 58 where the discharge of grout G to the outside was confirmed, the openings provided on the surfaces 51s and 51t of the beam member 5 are closed. In this manner, the filling of grout G into the first connecting passage 58C continues until the discharge of grout G from all connecting passages 58 except for the first connecting passage 58C is confirmed. After the discharge of grout G from all connecting passages 58 except for the first connecting passage 58C is confirmed, the filling of grout G is stopped.

[0038] (Other column member installation processes) Figure 10 is a longitudinal cross-sectional view showing the installation process for other column members. Next, as shown in Figure 10, another column member 2B is installed at a position spaced apart from the first column member 2A. In this case as well, if a column member 2B of the lower floor is already installed below the other column member 2B to be installed, the upper end of the main reinforcement bar 22 of the column member 2B of the lower floor is inserted from below into the lower part of the reinforcement bar joint portion 23 of the other column member 2B.

[0039] (Concrete beam formation process using cast-in-place concrete) After the other beam member installation processes described above, as shown in Figure 1, concrete is poured between the other beam end 5t of beam member 5 and the other column member 2B, and on the second concrete section 51B of beam member 5 to construct the cast-in-place concrete beam section 7. In this way, the other column member 2B and beam member 5 are joined, and the floor slab of the upper floor is constructed. The column-beam frame 1 is constructed from bottom to top by sequentially repeating the above-described processes of column member installation, beam member installation, grout filling, other column member installation, and on-site cast concrete beam formation on each floor.

[0040] According to the grout filling method described above, the grout filling method is a grout filling method in which grout G is filled into the joint between a precast concrete column member 2 and a beam member 5. In the column member 2, a plurality of connecting beam main reinforcement bars 27A and 27B are provided protruding from the side, and in the beam member 5, a plurality of beam reinforcement joint portions 54 formed in a cylindrical shape and having an internal space are embedded in the beam end portion 5s, and one end portion 52s of the beam main reinforcement bar 52 embedded in the beam member 5 is inserted into the end portion 5c of each beam reinforcement joint portion 54, and at the end portion 5s, the internal space is open to the outside at the end face 5f of the beam member 5, and each beam reinforcement joint portion 54 is opened in the beam reinforcement joint portion 54 A connecting passage 58 is formed extending from the through hole 54h to surfaces 51s and 51t other than the end face 5f, allowing the internal space to communicate with the outside. The beam members 5 are provided facing each other with their end faces 5f spaced apart to form a joint space ZS with the column members 2. Corresponding connecting beam main reinforcement bars 27A and 27B are inserted into each of the beam reinforcement joints 54. A joint formwork 90 is installed to close the lower and side of the joint space ZS. The process includes a joint formwork installation step, and a grout filling step in which grout G is injected under pressure into one of the multiple connecting passages 58C to begin filling, and then, after it is confirmed that the grout G has been discharged from all connecting passages 58 other than the one connecting passage 58C, the grout filling is stopped. With the above configuration, in the precast concrete beam member 5, multiple beam reinforcement joints 54, which are formed in a cylindrical shape and have an internal space, are embedded in the beam end 5s. At the end of each beam reinforcement joint 54 on the beam center 5c side, one end 52s of the main beam reinforcement 52 embedded in the beam member 5 is inserted, and at the end on the beam end 5s side, the internal space is in communication with the outside at the end face 5f of the beam member 5. In addition, in the beam member 5, a passage 58 is formed in each beam reinforcement joint 54, extending from the internal space to surfaces 51s and 51t other than the end face 5f via a through hole 54h opened in the beam reinforcement joint 54, thereby connecting the internal space to the outside. Furthermore, the beam members 5 are positioned opposite each other with their end faces 5f spaced apart so as to form a joint space ZS with the column members 2, which are also manufactured as precast concrete. Corresponding connecting beam main reinforcement bars 27A and 27B are inserted into each of the beam reinforcement joints 54. With this configuration, the joint space ZS, the internal space of each beam reinforcement joint 54, and the multiple connecting passages 58 formed in the beam members 5 for each beam reinforcement joint 54 are all in communication with each other. In this state, after installing the joint formwork 90 to close the bottom and sides of the joint space ZS, grout G is injected into one of the multiple connecting passages 58C to begin filling. The grout G is then first filled into the internal space of the beam reinforcement joint 54C where the connecting passage 58C is formed, via the connecting passage 58C, and then flows out from the internal space of the beam reinforcement joint 54C into the joint space ZS. Since the bottom and sides of the joint space ZS are closed by the joint formwork 90, the flowed-out grout G is filled inside the joint formwork 90. As the grout G fills the inside of the joint formwork 90, the upper surface of the grout G in the joint space ZS rises and reaches the height where other beam reinforcement joints 54 are provided, other than the one beam reinforcement joint 54C. At this point, the grout G flows continuously into the internal space of the other beam reinforcement joints 54, passes through the connecting passage 58 that communicates with the internal space, and is then discharged from the surfaces 51s and 51t of the beam member 5. In this way, the internal space of each beam reinforcement joint 54 is continuously filled with grout G. Once the internal space is filled with grout G, it is eventually discharged from the connecting passage 58 that communicates with the internal space. In other words, if there is a connecting passage 58 from which grout G is not discharged, it is possible that the internal space of the beam reinforcement joint 54 corresponding to that connecting passage 58 is not sufficiently filled with grout G. In this way, it is easy to confirm that the grout G has been evenly filled into each internal space of the beam reinforcement joint 54. Furthermore, since the joint space ZS, the internal space of each beam reinforcement joint 54, and the connecting passages 58 formed for each beam reinforcement joint 54 are all in communication, when filling with grout G as described above, the grout G only needs to be injected and filled into one of the multiple connecting passages 58C, and basically there is no need to inject and fill the other connecting passages 58 with grout G. Therefore, grout G can be easily filled. In this way, when joining a beam member 5 to a precast concrete column member 2 from the side, it becomes possible to confirm that grout G is evenly filled into the joint, and to realize a grout filling method that allows for easy filling of grout G.

[0041] If the connecting passage 58 extends, for example, from a through hole 54h opened in the beam reinforcement joint 54 to the end face 5f, and is provided so as to connect the internal space of the beam reinforcement joint 54 to the outside from the end face 5f, the end face 5f will form a joint space ZS. When grout G is filled into the joint space ZS, the opening of the connecting passage 58 may be blocked by the grout G. In this case, it will not be possible to confirm the discharge of grout from the opening of the connecting passage 58. Furthermore, it is conceivable that grout G may flow back into the connecting passage 58 from the opening provided in the end face 5f of the connecting passage 58, blocking the connecting passage 58 and eliminating an escape route for air in the internal space, thus preventing the grout G from being properly filled into the internal space of the beam reinforcement joint 54. In contrast, by configuring the connecting passage 58 to extend from the through hole 54h opened in the beam reinforcement joint 54 to the surfaces 51s and 51t other than the end face 5f, as described above, and to connect the internal space of the beam reinforcement joint 54 to the outside from the surfaces 51s and 51t other than the end face 5f, the above-mentioned situation can be suppressed.

[0042] In particular, in this embodiment, each beam reinforcement joint 54 has through holes 54h in both the axial direction of the beam reinforcement joint 54, specifically in the portion where a gap is formed between the inner surface of the beam reinforcement joint 54 and the outer surface of the beam reinforcement 52 when one end 52s of the beam main reinforcement 52 is inserted, and in the portion where a gap is formed between the inner surface of the beam reinforcement joint 54 and the outer surface of the connecting beam main reinforcement 27A and 27B when the ends of the connecting beam main reinforcement 27A and 27B are inserted. With the above configuration, when filling with grout G, if one end 52s of the main beam reinforcement 52 is inserted in the axial direction of the beam reinforcement joint 54, and the discharge of grout G is confirmed from the connecting passage 58 corresponding to the through hole 54h provided in the part where the gap formed between the inner surface of the beam reinforcement joint 54 and the outer surface of the main beam reinforcement 52 is located, it means that grout G has been filled between the inner surface of the beam reinforcement joint 54 and the outer surface of the main beam reinforcement 52, and that the main beam reinforcement 52 has been properly joined to the beam reinforcement joint 54. Furthermore, when filling with grout G, if the ends of the connecting beam main reinforcement bars 27A and 27B are inserted in the axial direction of the beam reinforcement joint 54, and the discharge of grout G is confirmed from the connecting passage 58 corresponding to the through hole 54h provided in the part where the gap formed between the inner surface of the beam reinforcement joint 54 and the outer surface of the connecting beam main reinforcement bars 27A and 27B is located, it means that grout G has been filled between the inner surface of the beam reinforcement joint 54 and the outer surface of the connecting beam main reinforcement bars 27A and 27B, and that the connecting beam main reinforcement bars 27A and 27B have been properly joined to the beam reinforcement joint 54. In this way, it can be confirmed that the main beam reinforcement 52 and the connecting beam main reinforcement 27A and 27B are properly joined.

[0043] Furthermore, in the grout filling method described above, since the grout G is continuously filled into the joint space ZS and the internal space of the beam reinforcement joint 54, any air pockets in the joint space ZS or the internal space of the beam reinforcement joint 54 can be reliably discharged to the outside of the beam member 5 via the connecting passage 58.

[0044] Furthermore, a joint width securing means 81 having a predetermined length is provided on either the surface of the column member 2 (the tip surface 25f of the protruding portion 25) or the end surface 5f of the beam member 5, which forms the joint space ZS, so as to protrude a predetermined length toward the other and maintain a constant width of the joint space ZS. Separation suppression means 82 is provided on the column member 2 and the beam member 5 to prevent them from separating due to the pressure when filling with grout G by joining the column member 2 and the beam member 5 together. With this configuration, a joint width securing means 81, such as a bolt, is provided to protrude by a predetermined length so that the width of the joint space ZS formed between the surface 25f of the column member 2 and the end face 5f of the beam member 5 does not narrow but is kept constant. Furthermore, by joining the column member 2 and the beam member 5 with a separation suppression means 82, separation between the column member 2 and the beam member 5 due to the pressure when filling with grout G is suppressed. Therefore, the joint Z can be formed by filling the joint space ZS with grout G while maintaining the width of the joint space ZS formed between the surface 25f of the column member 2 and the end face 5f of the beam member 5 at a predetermined dimension. This improves the accuracy of the width of the joint Z and the beam member 5 after filling the joint space ZS with grout G.

[0045] Furthermore, a projection 25 is formed on the portion of the column member 2 that faces the end face 5f of the beam member 5, having the same shape as the end face 5f and projecting toward the end face 5f. With this configuration, a projection 25 is formed on the portion of the column member 2 facing the end face 5f of the beam member 5, having the same shape as the end face 5f and projecting toward the end face 5f. Therefore, a joint formwork 90 for forming the joint Z can be installed along the outer circumferential surface of the projection 25 and the outer circumferential surface of the beam member 5. This allows the joint formwork 90 to be secured from the outside by, for example, fastening bands or frame materials, surrounding it from the outside, and tightening it toward the projection 25 and the beam member 5. Thus, the installation of the joint formwork 90 becomes easier.

[0046] Furthermore, the grout filling method of the present invention is not limited to the embodiments described above with reference to the drawings, and various modifications are conceivable within its technical scope. For example, in the above embodiment, each step was described as a method for constructing the column-beam frame 1, but the order of implementation and detailed procedures can be changed as appropriate. Furthermore, in the above embodiment, as shown in Figure 3, the grout G was pressed into a single connecting passage 58C provided to the beam reinforcement joint 54 located at the bottom, on the right side of the drawing, which was designated as a single beam reinforcement joint 54C, but it is not limited to this. As already explained, the joint space ZS, the internal space of each beam reinforcement joint 54, and the connecting passage 58 formed for each beam reinforcement joint 54 are all connected, forming a single space, so it is basically acceptable to press the grout G into any of the multiple connecting passages 58. In addition to the above, it is possible to select or replace the configurations listed in the above embodiments, or to change them to other configurations as appropriate, as long as it does not deviate from the spirit of the present invention. [Explanation of Symbols]

[0047] 2, 2A, 2B Column members 52, 52A, 52B Beam main reinforcement 5 Beam member 52s One end 5c Center of the beam; 54, 54C Reinforcement joint of the beam 5f End face 54h Through hole 5s Beam end 58, 58C Communication path 21s Side 58C Single connecting passage 25 Projection 81 Means for securing joint width 25f Tip surface (surface of column member) 82 Separation suppression means 27A, 27B Main reinforcement bars for connecting beams 90 Joint formwork 51 Concrete G Grout 51s, 51t surface ZS joint space

Claims

1. A grout filling method for filling the joint between a precast concrete column member and a beam member, The column member is provided with a projection that protrudes from the side surface of the column member, The beam members are provided facing each other with a gap between them such that the end faces of the beam members form a joint space with the tip faces of the protruding portions. A recess is formed on the tip surface of the protruding portion and the end surface of the beam member. The process includes a grout filling step in which grout is filled into the joint space, and in this process, the grout is filled into the tip surface of the protruding part and the recess of the end surface of the beam member, forming a cotter, and after it is confirmed that the grout has been discharged from a passage that communicates with the joint space and extends to the surface of the beam member, the grout filling is stopped. A grout filling method characterized by the following features.

2. In the column member, a plurality of connecting beam main reinforcements are provided protruding from the tip surface of the protruding portion. In the beam member, a plurality of beam reinforcement joints, formed in a cylindrical shape and having an internal space, are embedded at the beam end, and the main beam reinforcement of the beam member and the connecting beam reinforcement are joined by the beam reinforcement joints. The internal space of each of the beam reinforcement joints communicates with the outside at the end face of the beam member, and the communication passage is formed so as to extend from a through hole opened in each of the beam reinforcement joints to the surface other than the end face, thereby connecting the internal space to the outside. The grout filling method according to feature 1.

3. A grout filling method for filling the joint between a precast concrete column member and a beam member, In the column member, multiple main reinforcement bars for connecting beams are provided protruding from the side. In the beam member, a plurality of beam reinforcement joints, formed in a cylindrical shape and having an internal space, are embedded at the beam end, and the main beam reinforcement of the beam member and the connecting beam reinforcement are joined by the beam reinforcement joints, and in each of the beam reinforcement joints, the internal space is in communication with the outside at the end face of the beam member, and a passage is formed in each of the beam reinforcement joints that extends from a through hole opened in the beam reinforcement joint to a surface other than the end face, allowing the internal space to communicate with the outside. The beam members are provided facing each other with their end faces spaced apart so as to form a joint space between them and the column members, and recesses are formed in the end faces of the column members and the beam members within the joint space. The process includes a grout filling step in which the grout is injected under pressure into one of the multiple connecting passages to begin filling, and then, after the discharge of the grout from all other connecting passages is confirmed, the grout filling is stopped, and at this time, the grout is filled into the recesses on the end faces of the column member and the beam member, forming cotters. A grout filling method characterized by the following features.

4. A grout filling method for filling the joint between a precast concrete column member and a beam member, A grout filling method characterized by providing a joint formwork between the protruding portion of the column member and the end face of the beam member to seal the lower and side of the joint space, forming a space in which the joint space, the internal space of the multiple beam reinforcement joints within the beam member, and the connecting passages communicating with each of the internal spaces are integrally connected, injecting grout into one of the multiple connecting passages, and stopping the injection after it is confirmed that the grout has been discharged from all of the other connecting passages.

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