Grout filling method

Abstract

To easily fill grout into a joint when joining a beam member to a precast concrete column member from the side, and to confirm that grout has been evenly filled into the joint. [Solution] A plurality of beam reinforcement joints 54 are embedded in a beam member 5, and one end 52s of a beam main reinforcement 52 and connecting beam main reinforcement 27A, 27B of a column member 2 are inserted into each of the beam reinforcement joints 54. The beam member 5 is formed with a communication passage 58 that extends from the internal space of the beam reinforcement joints 54 to surfaces 51s, 51t other than the end face 5f and communicates with the outside. The grout filling method includes a joint formwork installation process in which a joint formwork 90 is installed between the beam member 5 and the column member 2 so as to block the lower and lateral sides of the joint space ZS, and a grout filling process in which grout G is pressed into one of the communication passages 58C to start filling (arrow DR1), and then the filling of the grout G is stopped after it is confirmed that grout G has been discharged (arrow DR5) from all communication passages 58 other than one communication passage 58C.

Description

[Technical Field]

[0001] The present invention relates to a grout filling method for filling grout into joints between column members and beam members of a precast concrete structure. [Background technology]

[0002] In order to reduce construction time when constructing architectural structures, it is common to manufacture column and beam components as precast concrete in factories and then transport and assemble them at the construction site. Precast concrete components often have joints, such as mechanical joints with one end of the main reinforcement inserted, embedded in the end of the component. The rebar of the components to be joined is inserted into the joint from the outside, and the joint is filled with grout to join the components. Regarding grout filling, for example, Patent Document 1 discloses a configuration in which the column joint of a PCa horizontal structure in which the column joint and beam are integrated is directly joined to the PCa column of the lower floor and the PCa column of the upper floor, and the column connecting rebar of the column main reinforcement of the PCa column of the upper floor is inserted through the through-hole of the column joint and into the column joint member of the PCa column of the lower floor, so that the PCa columns of the upper and lower floors are arranged above and below each other via the column joint at the column-beam joint. In this configuration, a lower joint and a top joint are formed at the lower and upper ends of the column joint, respectively. Then, grout is filled into the column joint member that is installed at the column head of the PCa column of the lower floor and into which the column connecting rebar of the PCa column of the upper floor is inserted, and then hardened.The grout is then supplied to the base joint of the column connection section, thereby continuously filling the base joint, the through hole communicating with the base joint, and the top joint communicating with this through hole in sequence.

[0003] Patent Document 2 also discloses a configuration in which a precast concrete intermediate member with a through hole formed therein is placed on the upper surface of a concrete lower member with a gap, the periphery of this gap is sealed with a sealing member to form a lower joint space, a precast concrete upper member is placed on the upper surface of the intermediate member with a gap, and the lower member, intermediate member, and upper member are connected via reinforcing bars that pass through the through holes, the periphery of this gap is sealed with a sealing member to form an upper joint space, grout is supplied into the lower joint space, the through hole, and the upper joint space are filled with grout, and air inside the upper joint space is vented through a plurality of air vent passages that pass 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 a joint between a lower column member having a plurality of sleeve joints embedded in concrete with their upper ends exposed on the upper surface and an upper column member having a plurality of upper column main reinforcements protruding downward from the lower surface of the concrete, the upper column member is positioned so that each of the upper column main reinforcements is inserted into a corresponding hole in the sleeve joint and is joined to the lower column member at a predetermined position that ensures a joint of a predetermined width between the upper column member and the lower column member, and the upper column main reinforcements are joined to the lower column main reinforcements by hardening grout filled in the sleeve joint. In this configuration, a concrete member is prepared that has a plurality of holes that open to the joining surface with another member and have grout injection ports, and that has grout injection passages that lead from an outer surface different from the joining surface to the plurality of grout injection ports via a plurality of branch portions. After the reinforcing bars of the other member are inserted into the holes, a nozzle pipe is inserted into the grout injection passage from the outer surface side, and grout is discharged from the nozzle into the grout injection passage with the nozzle positioned at a position corresponding to each branch portion.

[0005] The above Patent Documents 1 to 3 mainly describe the case where precast concrete column members are joined together or where a precast concrete column member is joined to a beam-column joint member in the vertical direction. These Patent Documents 1 to 3 may also be applicable to the case where a precast concrete beam member is joined to a precast concrete column member from the side. In Patent Document 1, a lower joint and a top 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 top joint are connected by a plurality of through-holes provided vertically penetrating the column joint. In this configuration, grout is pressed from the lower joint side through the through-holes and filled into the top joint side. The filling of grout is stopped by confirming that grout has been discharged from a discharge pipe provided in communication with the top joint. In this configuration, it is not possible to confirm whether grout has been evenly filled into each of the plurality of through-holes provided in the column joint, or throughout the entire lower joint and top joint. In Patent Document 2, as in Patent Document 1, it is not possible to confirm whether the joints have been evenly filled with grout. Therefore, even if Patent Documents 1 and 2 are applied when joining a precast concrete beam member to a precast concrete column member from the side, it is not possible to confirm whether grout has been evenly filled in the joint.

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

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-144251 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-226069 [Patent Document 3] Japanese Patent Application Laid-Open No. 2017-96059 Summary of the Invention [Problem to be solved by the invention]

[0008] The problem that the present invention aims to solve is to provide a grout filling method that, when joining a beam member to a precast concrete column member from the side, makes it possible to confirm that grout has been evenly filled in the joint and makes it easy to fill the grout. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention employs the following means. That is, the grout filling method of the present invention is a grout filling method for filling grout into a joint between a column member and a beam member of a precast concrete structure, in which a plurality of connecting main beam reinforcements are provided protruding from the side of the column member, a plurality of cylindrically formed beam reinforcement joints each having an internal space are embedded in the beam end of the beam member, one end of one of the main beam reinforcement joints embedded in the beam member is inserted into the end of each of the beam reinforcement joints on the beam center side, and at the end on the beam end side, the internal space is connected to the outside at the end face of the beam member, and for each of the beam reinforcement joints, grout is inserted from a through hole opened in the beam reinforcement joint to the end face or beyond. The method is characterized by including a joint formwork installation process in which a connecting passage is formed that extends to the outer surface and connects the internal space to the outside, the beam members are arranged opposite each other with a distance between them so that the end faces form a joint space between them and the column members, the corresponding main beam reinforcing bars for connecting are inserted into each of the beam reinforcing bar joint parts, and a joint formwork is installed to block the below and sides of the joint space; and a grout filling process in which the grout is pressed into one of the multiple connecting passages to start filling, and then the filling of the grout is stopped after it is confirmed that the grout has been discharged from all of the connecting passages other than the one connecting passage. According to the above-described configuration, a precast concrete beam member has a plurality of cylindrical beam reinforcing bars embedded in its end portion, each of which has an internal space. The end of each beam reinforcing bar is inserted into the end of the beam center, and the internal space is connected to the outside at the end of the beam. Each beam reinforcing bar is provided with a communication passage extending from a through hole in the beam reinforcing bar to a surface other than the end face, connecting the internal space to the outside. The end faces of the beam member are positioned facing each other, spaced apart from each other, to form a joint space between the beam member and a column member also manufactured as a precast concrete structure. A corresponding beam reinforcing bar is inserted into each beam reinforcing bar. This configuration allows the joint space, the internal space of each beam reinforcing bar, and the multiple communication passages formed in the beam member for each beam reinforcing bar are all connected. In this state, after a joint formwork is installed to close the joint space below and to the sides, grout is pressed into one of the multiple communication passages to begin filling. The grout then first fills the internal space of the beam reinforcing bar joint through the communication passage, and then flows out from the internal space of the beam reinforcing bar joint into the joint space. Because the joint space is blocked below and to the sides by the joint formwork, the outflowing grout fills the inside of the joint formwork. As the grout fills the inside of the joint formwork, the upper surface of the grout in the joint space rises and reaches the height of the other beam reinforcing bar joints. The grout then flows continuously into the internal space of the other beam reinforcing bar joints, passes through the communication passages that connect to the internal space, and is then discharged from the surface of the beam member. In this way, grout is continuously filled into the internal space of each beam reinforcing bar joint. Once the internal space is filled with grout, it is eventually discharged through the connecting passages that are connected to the internal space. In other words, if there is a connecting passage from which grout is not discharged, it is possible that the internal space of the beam reinforcement joint corresponding to that connecting passage is not sufficiently filled with grout. In this way, it is easy to confirm that the internal space of each beam reinforcement joint has been evenly filled with grout. Furthermore, since the joint space, the internal space of each beam reinforcement joint, and the communication passages formed for each beam reinforcement joint are all in a state of communication, when filling the grout as described above, it is only necessary to pressurize and fill one of the multiple communication passages, and basically there is no need to pressurize and fill the grout from the other communication passages, which makes it easy to fill the grout. In this way, it is possible to realize a grout filling method that, when joining a beam member to a precast concrete column member from the side, makes it possible to confirm that grout has been evenly filled in the joint and that allows for easy filling of grout.

[0010] In one aspect of the present invention, a joint width securing means having the predetermined length is provided on either the surface of the column member or the end face of the beam member, which form the joint space, and protrudes toward the other by a predetermined length so as to maintain the width of the joint space constant, and the column member and the beam member are provided with a separation suppression means that joins the column member and the beam member to prevent the column member and the beam member from separating due to the pressure when filling the grout. According to this configuration, a joint width securing means, such as a bolt, is provided protruding by a predetermined length so that the width of the joint space formed between the surface of the column member and the end face of the beam member is maintained constant without narrowing. Furthermore, by joining the column member and the beam member with a separation suppression means, the column member and the beam member are prevented from separating due to the pressure applied when filling the grout. Therefore, the joint space can be filled with grout to form a joint while maintaining the width of the joint space formed between the surface of the column member and the end face of the beam member at a predetermined dimension. This allows for increased accuracy in the joint width and the position of the beam member after filling the joint space with grout.

[0011] In one aspect of the present invention, a protrusion is formed on the portion of the column member that faces the end face of the beam member, the protrusion having the same shape as the end face and protruding toward the end face. With this configuration, the column member has a protrusion that protrudes toward the end face of the beam member, and the protrusion has the same shape as the end face. This allows the joint formwork for forming the joint to be installed along the outer periphery of the protrusion and the outer periphery of the beam member. This allows the joint formwork to be secured by tightening it from the outside toward the protrusion or the beam member using, for example, a tightening band or frame material that surrounds the joint formwork from the outside. This makes it easy to install the joint formwork. [Effects of the Invention]

[0012] According to the present invention, a grout filling method can be provided that, when joining a beam member to a precast concrete column member from the side, makes it possible to confirm that grout has been evenly filled in the joint and makes it easy to fill the grout. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a vertical cross-sectional view showing the configuration of a beam-column frame constructed by applying a grout filling method according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged vertical cross-sectional view of the portion viewed from the arrow A in FIG. [Figure 3] FIG. 3 is a longitudinal sectional view of the portion viewed from the arrow II in FIG. 2. [Figure 4] FIG. 2 is an enlarged vertical cross-sectional view of the portion viewed from the arrow B in FIG. [Figure 5] 2 is a vertical cross-sectional view showing a state in which one column member has been installed when constructing the column-beam frame of FIG. 1. FIG. [Figure 6] FIG. 6 is a vertical cross-sectional view showing a state in which the beam member is moved laterally from the state shown in FIG. 5. [Figure 7] FIG. 10 is a partial vertical cross-sectional view showing a state in which the beam member is moved laterally so that the end face of the beam member faces the tip face of the protrusion. [Figure 8] This is a plan view of the joint between the column member and the beam member, viewed from above. [Figure 9] FIG. 2 is a schematic diagram showing the flow of grout in the grout filling process. [Figure 10] FIG. 10 is a vertical cross-sectional view showing another pole member installation process. DETAILED DESCRIPTION OF THE INVENTION

[0014] The present invention provides a grout filling method for filling a joint between a column member and a beam member with grout. The grout filling method forms a joint by continuously filling the internal space of the beam reinforcement joint and the joint space provided in the gap at the joint between the column side surface of the column member and the end surface of the beam member from bottom to top. Specifically, the grout fills the internal space of the beam reinforcement joint where the injection port is located with filler material and then discharges it. At the same time, the grout that overflows from the beam reinforcement joint where the injection port is located rises from bottom to top into the joint space, continuously filling the internal spaces of the other beam reinforcement joints to form a joint. Hereinafter, an embodiment of the grout filling method according to the present invention will be described with reference to the accompanying drawings. First, the configuration of a beam-column frame constructed by applying the grout filling method according to an embodiment of the present invention will be described, and then a method of constructing the beam-column frame including the grout filling method will be described. A longitudinal cross-sectional view showing the structure of the above-mentioned beam-column frame is shown in Fig. 1. As shown in Figure 1, the column-beam frame 1 includes multiple 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 multiple 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 portion 21, column main reinforcement 22 embedded in the concrete portion 21, and column reinforcement joint portions 23. The concrete portion 21 has, for example, a rectangular cross-sectional shape in plan view. A plurality of column main reinforcements 22 are embedded in the concrete portion 21. Here, there are no limitations on the number or arrangement of the column main reinforcements 22. The column main reinforcements 22 are provided extending in the vertical direction. The upper ends of the column main reinforcements 22 protrude upward from the upper surface of the concrete portion 21. The lower ends of the column main reinforcements 22 are inserted into the upper parts of column reinforcement joint parts 23 embedded in the lower end of the column member 2.

[0015] The column reinforcement joint 23 is formed in a cylindrical shape and has a structure with an internal space. The column reinforcement joint 23 is oriented so that the axial direction of the cylinder coincides with the vertical direction. The column reinforcement joint 23 is embedded in the concrete part 21. The lower end of the column reinforcement joint 23 is exposed on the underside of the concrete part 21, and the internal space of the column reinforcement joint 23 opens downward. A plurality of such column members 2 are connected in the vertical direction to form a column 11. The column members 2 positioned above and below each other are joined by inserting the upper end of the column main reinforcement 22 of the lower column member 2 from below into the internal space of the column reinforcement joint part 23 of the upper column member 2, and filling the internal space of the column reinforcement joint part 23 with grout (not shown). In addition, grout is filled between the concrete part 21 of the lower column member 2 and the concrete part 21 of the upper column member 2, forming a joint.

[0016] FIG. 2 is an enlarged vertical cross-sectional view of the portion indicated by the arrow A in FIG. As shown in Figures 1 and 2, each column member 2 has a protrusion 25 in the vertical direction at a portion facing an end face 5f of a beam member 5 constituting a beam 12, which will be described later. The protrusion 25 protrudes horizontally from the side surface 21s of the concrete portion 21 of the column member 2 toward the beam member 5. The protrusion 25 is formed integrally with the concrete portion 21. The shape of the protrusion 25 when viewed from the protruding direction of the protrusion 25 is formed to match the shape of the beam member 5 when viewed from the extension direction of the beam member 5. More specifically, when viewed from the extension direction of the beam member 5, the shapes of the protrusion 25 and the bottom surface of the beam member 5 match. Furthermore, when viewed from the extension direction of the beam member 5, the shapes of the protrusion 25 and the side surface of the beam member 5 match. Furthermore, in this embodiment, the shapes of the protrusion 25 and the top surface of the beam member 5 when viewed from the extension direction of the beam member 5 match. In this way, the protrusion 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 recess inward of the protruding portion 25, i.e., in a direction away from the end surface 5f of the beam member 5. This recess 25d is filled with grout G that forms a joint Z, which will be described later, to form a cotter that bears the shear force acting between the protruding portion 25 and the grout G that forms the joint Z.

[0017] Furthermore, the column member 2 is provided with a plurality of connecting beam main reinforcements 27A, 27B that protrude from the side, more specifically from the tip end surface 25f of the protruding portion 25, toward the beam member 5. The multiple connecting beam main reinforcements 27A, 27B are provided to penetrate horizontally through the concrete portion 21 and the protruding portion 25. The connecting beam main reinforcement 27A is provided at the same height as the upper beam main reinforcement 52A of the beam member 5 described below. The connecting beam main reinforcement 27B is provided below the connecting beam main reinforcement 27A. The connecting beam main reinforcement 27B is provided at the same height as the lower beam main reinforcement 52B of the beam member 5 described below. A plurality of stiffeners 28 are embedded near the protruding portion 25, and are arranged to surround the connecting beam main reinforcements 27A, 27B.

[0018] In this embodiment, each beam 12 includes a beam member 5 and a cast-in-place concrete beam portion 7 . As shown in Fig. 1, the beam member 5 is made of precast concrete, and one beam end 5s (one end of the beam member 5) is directly joined to one column member 2A that forms the column 11 shown on the left side in Fig. 1, while the other beam end 5t (the other end of the beam member 5) is joined to another column member 2B that forms the column 11 shown on the right side in Fig. 1 via a cast-in-place concrete beam portion 7. As shown in Figs. 1 and 2, the beam member 5 mainly comprises concrete 51, beam main reinforcement 52, beam ribs 53, and beam reinforcement joints 54.

[0019] Concrete 51 has, for example, a rectangular cross-sectional shape when viewed from the extension direction of beam member 5. Concrete 51 integrally includes first concrete portion 51A and second concrete portion 51B. The first concrete portion 51A forms the concrete 51 on one beam end 5s side. The first concrete portion 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 FIG. 2 , the first concrete portion 51A has a through-hole 51k formed in the vertical center thereof. The through-hole 51k penetrates the first concrete portion 51A in the beam width direction (the depth direction of the paper in FIG. 2 ) and allows for the insertion of equipment piping or the like. The first concrete portion 51A has a recess 51d formed in the center of the end face 5f opposite the tip face 25f of the protrusion 25, the recess 51d being recessed inward of the first concrete portion 51A, i.e., in a direction away from the tip face 25f of the protrusion 25. The recess 51d is filled with grout G that forms a joint Z (described later), forming a cotter to bear the shear force acting between the protrusion 25 and the grout G that forms the joint Z. The second concrete portion 51B forms the concrete 51 in the beam center portion 5c and the other beam end portion 5t. The second concrete portion 51B is provided only in the lower portion of the beam member 5, in the beam center portion 5c in the extension direction of the beam member 5 and the other beam end portion 5t.

[0020] 3 is a vertical cross-sectional view of the portion indicated by the arrow II in FIG. 2. FIG. As shown in FIGS. 2 and 3, the beam main reinforcements 52 include a plurality of upper beam main reinforcements 52A and a plurality of lower beam main reinforcements 52B. The beam main reinforcements 52 are provided corresponding to each of the plurality of joining beam main reinforcements 27A and 27B. The upper beam main reinforcements 52A and the lower beam main reinforcements 52B extend in the extension direction (horizontal direction) of the beam member 5. The lower beam main reinforcements 52B are provided below the upper beam main reinforcements 52A. The upper beam main reinforcements 52A are provided above the lower beam main reinforcements 52B. In this embodiment, the upper beam main reinforcements 52A and the lower beam main reinforcements 52B are each arranged in two rows, one above the other. In each row, a plurality of upper beam main reinforcements 52A and a plurality of lower beam main reinforcements 52B are arranged 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 smaller than the diameter and strength of the joining beam main reinforcement 27A, 27B.

[0021] 1 and 2, the beam member 5 is formed as a full precast concrete structure in which both the lower beam main reinforcement 52B and the upper beam main reinforcement 52A are embedded in the first concrete section 51A at one beam end 5s. In addition, the beam member 5 is formed as a half precast concrete structure in which the lower beam main reinforcement 52B is embedded in the second concrete section 51B at the beam center 5c and the other beam end 5t, and the upper beam main reinforcement 52A is exposed above the concrete 51A. A plurality of sets of beam reinforcements 53 are provided at intervals in the extension direction of the beam member 5. Each beam reinforcement 53 is provided so as to surround an upper beam main reinforcement 52A and a lower beam main reinforcement 52B.

[0022] The beam reinforcement joints 54 are cylindrical and have an internal space. The beam reinforcement joints 54 are oriented so that the axial direction of the cylinder coincides with the horizontal direction in which the beam member 5 extends. A plurality of beam reinforcement joints 54 are embedded in the first concrete portion 51A at one beam end 5s of the beam member 5. A beam reinforcement joint 54 is provided corresponding to each of the plurality of beam main reinforcements 52, and at the same time, a beam reinforcement joint 54 is provided corresponding to each of the plurality of connecting beam main reinforcements 27A, 27B. As shown in Fig. 2, one end 52s of the beam main reinforcement 52 (upper beam main reinforcement 52A, lower beam main reinforcement 52B) embedded in the beam member 5 is inserted into the end of each of the multiple beam reinforcement joints 54 on the beam center 5c side (right side in Fig. 2). The inner peripheral surface of the beam reinforcement joint 54 and the outer peripheral surface of the beam main reinforcement 52 are spaced apart in the radial direction of the beam reinforcement joint 54, thereby forming a gap between them. The end of each of the multiple beam bar joints 54 on the beam end portion 5s side (left side in FIG. 2) is exposed at the end face 5f of the first concrete portion 51A (concrete 51) of the beam member 5, and the internal space of the beam bar joints 54 opens horizontally and communicates with the outside. In each beam bar joint 54, the end of the corresponding connecting beam main reinforcement 27A, 27B is inserted from the end on the beam end portion 5s side that opens horizontally and communicates with the outside. The inner peripheral surface of the beam bar joint 54 and the outer peripheral surfaces of the connecting beam main reinforcement 27A, 27B are spaced apart in the radial direction of the beam bar joint 54, forming a gap between them.

[0023] Each beam bar joint 54 has through holes 54h that penetrate in a direction perpendicular to the axial direction of the beam bar joint 54, so as to communicate the internal space of the beam bar joint 54 with the outside of the beam bar joint 54. For each beam bar joint 54, the through holes 54h are provided at both ends in the axial direction of the beam bar joint 54. Thus, in this embodiment, each beam bar joint 54 has two through holes 54h. In particular, in this embodiment, one of the two through holes 54h is opened in a portion where a gap is formed between the inner peripheral surface of the beam bar joint 54 and the outer peripheral surface of the beam main reinforcement 52 when one end 52s of the beam main reinforcement 52 is inserted in the axial direction of the beam bar joint 54. The other of the two through holes 54h is opened in a portion where a gap is formed between the inner peripheral surface of the beam bar joint 54 and the outer peripheral surfaces of the beam main reinforcement 52 when the ends of the connecting beam main reinforcement 27A, 27B are inserted in the axial direction of the beam bar joint 54.

[0024] In the internal space of each beam reinforcement joint section 54, grout G is filled in the gap between the end of the connecting beam main reinforcement 27A, 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 surface of the beam reinforcement joint section 54 and the outer surface of the beam main reinforcement 52, and the gap between the inner surface of the beam reinforcement joint section 54 and the outer surface of the connecting beam main reinforcement 27A, 27B. The beam member 5 is arranged so that a predetermined gap, which will be described later as a joint space ZS using Figure 9 etc., is formed between the end face 5f of one beam end portion 5s and the tip face 25f of the protrusion 25 of the column member 2 facing the end face 5f. The joint space ZS, which is the gap between the end face 5f and the tip face 25f, is filled with grout G to form a joint Z.

[0025] In order to fill the grout G as described above, the beam member 5 is formed with a plurality of communication passages 58 as shown in Fig. 3. In this embodiment, the plurality of communication passages 58 are provided corresponding to all of the through holes 54h of all of the beam reinforcement joints 54. Therefore, in this embodiment, two communication passages 58 are provided for each beam reinforcement joint 54. One end of each of the plurality of communication passages 58 is provided to communicate with a corresponding through hole 54h. Each of the communication passages 58 is connected to a corresponding through hole 54h. Each of the plurality of communication passages 58 is provided to extend from the through hole 54h through the interior of the first concrete portion 51A to surfaces 51s, 51t other than the end face 5f. The other end of each of the plurality of communication passages 58 is provided to open from the surfaces 51s, 51t other than the end face 5f toward the outside. In this way, each of the plurality of communication passages 58 communicates the internal space of the beam reinforcement joint portion 54 with the outside of the beam member 5 via the corresponding through hole 54h of the beam reinforcement joint portion 54.

[0026] More specifically, in this embodiment, the internal space of beam reinforcement joint 54 embedded below first concrete portion 51A communicates with the outside from lateral surface 51s (i.e., side surface) of first concrete portion 51A by communicating passage 58. The internal space of beam reinforcement joint 54 embedded above first concrete portion 51A communicates with the outside from either lateral surface 51s of first concrete portion 51A or upward-facing surface 51t (i.e., top surface) of first concrete portion 51A by communicating passage 58. Such a communication passage 58 can be formed by burying a pipe material such as a polyvinyl chloride pipe when forming the first concrete portion 51A of the beam member 5 by pouring concrete. As will be described in detail later, the grout G is filled into the internal spaces of the plurality of beam reinforcement joint portions 54 through one communication passage 58C (see FIG. 2) of the plurality of communication passages 58. After the internal spaces of the plurality of beam reinforcement joint portions 54 are filled with the grout G, each of the plurality of communication passages 58 is also filled with the grout G.

[0027] The cast-in-place concrete beam section 7 includes a first cast-in-place concrete section 71 formed between the other beam end section 5t of the beam member 5 and the other 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 integrally formed. FIG. 4 is an enlarged vertical cross-sectional view of the portion viewed from the arrow B in FIG. A plurality of cylindrical beam reinforcement joints 59 are provided at the positions of the protruding portions 25 of the other column member 2B so as to correspond to each of the beam main reinforcements 52. The counterpart member ends 52t of the upper beam main reinforcements 52A and the lower beam main reinforcements 52B are inserted into the ends of the corresponding beam reinforcement joints 59 on the beam center portion 5c side. Ends of connecting beam main reinforcements 27A, 27B provided to protrude from the protruding portions 25 of the other column member 2B are inserted into each of the beam reinforcement joints 59. Concrete is poured on site to embed the upper beam main reinforcements 52A, the lower beam main reinforcements 52B, and the plurality of beam reinforcement joints 59, thereby forming a first cast-in-place concrete section 71. The second cast-in-place concrete section 72 is formed by pouring concrete on-site at the beam center 5c of the beam member 5 and the other beam end 5t so as to bury the upper beam main reinforcement 52A above the second concrete section 51B.

[0028] In the above-described configuration, the upper beam main reinforcement 52A and the lower beam main reinforcement 52B are connected to the connecting beam main reinforcement 27A and 27B of the column members 2A and 2B using beam reinforcement joints 54 and 59. As described above, the diameter and strength of the upper beam main reinforcement 52A and the lower beam main reinforcement 52B are set smaller than those of the connecting beam main reinforcement 27A and 27B. This configuration shifts the location where a plastic hinge occurs in the event of an earthquake or other event from position P1 at the end of the beam 12 to position P2 at the end of the beam reinforcement joints 54 and 59 toward the center of the beam 12, as shown in FIG. 1 . This allows hinge relocation, which keeps the column-beam joint within its elastic range.

[0029] Next, a method for constructing the above-described beam-column frame 1 will be described. To construct the column-beam frame 1, the following steps are carried out on each floor. (Column member installation process) FIG. 5 is a vertical cross-sectional view showing a state in which one column member has been installed when constructing the column-beam frame of FIG. 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 one column member 2A to be installed, the upper end of the column main reinforcement 22 of the column member 2A of the lower floor is inserted from below into the lower part of the column reinforcement joint part 23 of the one column member 2A.

[0030] (Beam member installation process) Next, the beam member 5 is hung and placed at a position facing the protruding portion 25 of one of the pillar members 2A in the horizontal direction. Fig. 6 is a vertical cross-sectional view showing a state in which the beam member has been moved laterally from the state shown in Fig. 5. Fig. 7 is a partial vertical cross-sectional view showing a state in which the beam member has been moved laterally so that the end face of the beam member faces the tip face of the protrusion. Fig. 8 is a plan view of the joint between the column member and the beam member as viewed from above. Next, the beam member 5 is moved laterally, and the connecting beam main reinforcements 27A, 27B protruding from the protruding portion 25 are inserted into each of the multiple beam reinforcement joints 54. Then, the beam member 5 is positioned so that the tip surface 25f of the protruding portion 25 of one column member 2A faces the end surface 5f of the beam member 5, with a predetermined gap, i.e., joint space ZS, between them. When the end surface 5f of the beam member 5 faces the tip surface 25f of the protruding portion 25, the positions of the bottom surface, both side surfaces, and top surface of the protruding portion 25 and the beam member 5 are aligned when viewed from the extension direction of the beam member 5. More specifically, the beam member 5 is positioned so that the bottom 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, extend in the same plane.

[0031] Here, to form the joint space ZS, a joint width securing means 81 having a predetermined length is provided on either the surface of the column member 2 (tip surface 25f of the protrusion 25) or the end surface 5f of the beam member 5, protruding a predetermined length toward the other so as to maintain a constant width of the joint Z. In this embodiment, the joint width securing means 81 is formed by a bolt protruding a predetermined length toward the end surface 5f of the beam member 5 on the tip surface 25f of the protrusion 25 of the column member 2 and screwing it into an insert embedded in the protrusion 25. When the beam member 5 is moved laterally, the end surface 5f of the beam member 5 is abutted against the bolt serving as the joint width securing means 81, so that the tip surface 25f of the protrusion 25 of one column member 2A and the end surface 5f of the beam member 5 face each other with a predetermined gap therebetween.

[0032] In this state, the column member 2 and the beam member 5 are joined by separation suppression means 82. In this embodiment, the separation suppression means 82 includes, for example, fixing metal fittings 83 with an L-shaped cross section that are bolted to the upper and lower surfaces of the first concrete portion 51A of the beam member 5, and bolts 84 that connect the fixing metal fittings 83 to the side surface 21s of the column member 2. Such separation suppression means 82 suppresses the column member 2 and the beam member 5 from separating from each other due to the pressure that will be applied later when grout G is filled into the joint space ZS.

[0033] (Grout filling process) Next, grout G is filled into the joint space ZS between the tip end surface 25f of the protruding portion 25 of one of the column members 2A and the end surface 5f of the beam member 5, thereby forming a joint Z. To do this, first, a joint formwork 90 is installed so as to close the joint space ZS from below and on both sides (joint formwork installation process). The joint formwork 90 is installed so as to cover the joint space ZS between the tip surface 25f of the protrusion 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 beam member 5 is aligned so that the respective undersides of the protrusion 25 and the beam member 5, and the respective side surfaces of the protrusion 25 and the beam member 5, extend within the same plane. Therefore, by installing the joint formwork 90 so that it extends within these planes, the joint formwork 90 can be easily installed.

[0034] FIG. 9 is a schematic diagram showing the flow of grout in the grout filling step. Next, grout G is filled between the tip end face 25f of the protruding portion 25 of one of the pillar members 2A and the end face 5f of the beam member 5 (grout filling step). After the above-described steps up to the installation of the joint formwork 90 have been completed, the joint space ZS and the internal space of each beam reinforcement joint 54 are in communication with each other because a gap is formed between the inner peripheral surface of the beam reinforcement joint 54 and the outer peripheral surface of the end of the connecting beam main reinforcement 27A, 27B inserted into the beam reinforcement joint 54. The internal space of each beam reinforcement joint 54 is also in communication with the outside from the surfaces 51s, 51t of the beam member 5 via the through holes 54h and the communication passages 58 connected thereto. In this way, the joint space ZS, the internal space of each beam reinforcement joint 54, and the communication passages 58 formed for each beam reinforcement joint 54 are all in communication with each other, forming a single space. In this embodiment, conceptually, for such a single space, grout G is pressed into the openings of one communication passage 58C of the plurality of communication passages 58 provided on the surfaces 51s, 51t of the beam member 5, thereby filling all of the portions that communicate as the single space with grout G. By continuing to pressurize the grout G until the grout G is discharged from the openings of all communication passages 58 other than the one communication passage 58C provided on the surfaces 51s, 51t of the beam member 5, it can be confirmed that the grout G has been evenly filled into the joint space ZS and the internal spaces of all beam reinforcement joint portions 54.

[0035] More specifically, as shown in Figures 3 and 9, filling begins by pressurizing grout G into one communication passage 58C arbitrarily selected from the plurality of communication passages 58. In the example shown in Figure 3, the lowest beam reinforcement joint 54 provided on the right side of the drawing is designated as one beam reinforcement joint 54C, and as shown in Figure 9, one of the two communication passages 58 provided for that one beam reinforcement joint 54C is designated as the one communication passage 58C, and grout G is pressurized into that one communication passage 58C. Then, as shown by arrow DR1, grout G is first filled into the internal space of the one beam reinforcement joint 54C through the one communication passage 58C. The grout G then flows out of the internal space of the beam reinforcement joint 54C into the joint space ZS as shown by arrow DR2. At the same time, the grout G passes through the other communicating passages 58 other than the communicating passage 58C provided in the beam reinforcement joint 54C from the internal space of the beam reinforcement joint 54C and is discharged to the outside as shown by arrow DR3. If it is confirmed that grout G has been discharged to the outside from the communicating passage 58, the openings of the communicating passages 58 provided on the surfaces 51s, 51t of the beam member 5 are closed to prevent further discharge of grout G.

[0036] As described above, when grout G flows from the internal space of one beam reinforcing bar joint 54C into the joint space ZS, the joint space ZS is blocked below and to the sides by the joint formwork 90, so the outflowing grout G accumulates and fills inside the joint formwork 90. ​​As the grout G continues to fill the inside of the joint formwork 90, the upper surface of the grout G in the joint space ZS rises and reaches the height at which other beam reinforcing bar joints 54 are installed, other than the one beam reinforcing bar joint 54C. Then, as shown by arrow DR4, the grout G flows into the internal space of the other beam reinforcing bar joint 54. After flowing into the internal space of the other beam reinforcing bar joint 54, the grout G passes through the connecting passage 58 that communicates with the internal space of the other beam reinforcing bar joint 54, as shown by arrow DR5, and is then discharged from the surfaces 51s, 51t of the beam member 5. For the communication passages 58 in which it has been confirmed that the grout G has been discharged to the outside, the openings provided on the surfaces 51s and 51t of the beam member 5 are closed. In this manner, filling of the grout G into the one communication passage 58C continues until it is confirmed that the grout G has been discharged from all communication passages 58 other than the one communication passage 58C. After it is confirmed that the grout G has been discharged from all communication passages 58 other than the one communication passage 58C, filling of the grout G is stopped.

[0037] (Installation process of other pillar components) FIG. 10 is a vertical cross-sectional view showing another pole member installation step. Next, as shown in Figure 10, another column member 2B is installed at a position separated from the first column member 2A. In this case, if a column member 2B of a lower floor is already installed below the other column member 2B to be installed, the upper end of the column main reinforcement 22 of the column member 2B of the lower floor is inserted from below into the lower part of the column reinforcement joint part 23 of the other column member 2B.

[0038] (On-site concrete beam formation process) After the other beam member installation process described above, as shown in Fig. 1, concrete is poured between the other beam end 5t of the beam member 5 and the other column member 2B, and on the second concrete portion 51B of the beam member 5, to construct a cast-in-place concrete beam portion 7. In this way, the other column member 2B and the beam member 5 are joined, and the floor slab of the upper floor is constructed. The column-beam structure 1 is constructed from bottom to top by repeating the above-mentioned column member installation process, beam member installation process, grout filling process, other column member installation process, and on-site concrete beam section formation process on each floor in sequence.

[0039] According to the grout filling method as described above, the grout filling method is a grout filling method in which grout G is filled into the joint portion between a column member 2 and a beam member 5 of precast concrete construction, and in the column member 2, a plurality of connecting beam main reinforcements 27A, 27B are provided protruding from the side, and in the beam member 5, a plurality of beam reinforcement joints 54 formed in a cylindrical shape and having an internal space are embedded in the beam end portion 5s, and one end 52s of the beam main reinforcement 52 embedded in the beam member 5 is inserted into the end portion of each beam reinforcement joint 54 on the beam center portion 5c side, and at the end portion on the beam end portion 5s side, the internal space is connected to the outside at the end face 5f of the beam member 5, and for each beam reinforcement joint 54, The process includes a joint form installation process in which a connecting passage 58 is formed extending from the through hole 54h to surfaces 51s, 51t other than the end face 5f, connecting the internal space to the outside, the beam members 5 are arranged facing each other at a distance so that the end faces 5f form a joint space ZS between them and the column member 2, and corresponding connecting beam main reinforcements 27A, 27B are inserted into each of the beam reinforcement joint parts 54, and a joint form 90 is installed to block the lower and lateral sides of the joint space ZS; and a grout filling process in which grout G is pressed into one connecting passage 58C of the multiple connecting passages 58 to start filling, and then the filling of the grout G is stopped after it is confirmed that the grout G has been discharged from all connecting passages 58 other than the one connecting passage 58C. According to the above-mentioned configuration, in a precast concrete beam member 5, a plurality of cylindrical beam reinforcing bar joints 54 having an internal space are embedded in the beam end portion 5s, and one end 52s of the beam main reinforcement 52 embedded in the beam member 5 is inserted into the end portion of each beam reinforcing bar joint 54 on the beam center portion 5c side, and at the end portion on the beam end portion 5s side, the internal space communicates with the outside at the end face 5f of the beam member 5. Also, in the beam member 5, a communication passage 58 is formed that extends from the internal space to the surfaces 51s, 51t other than the end face 5f through a through hole 54h opened in each beam reinforcing bar joint 54, connecting the internal space to the outside. Furthermore, the beam members 5 are arranged facing each other with a gap between their end faces 5f and the column members 2, which are also manufactured as precast concrete structures, to form a joint space ZS, and corresponding connecting beam main reinforcements 27A, 27B are inserted into each of the beam reinforcement joints 54. With this configuration, the joint space ZS and the internal space of each beam reinforcement joint 54, as well as the multiple communication passages 58 formed in the beam members 5 for each beam reinforcement joint 54, are all in a state of communication. In this state, after a joint formwork 90 is installed so as to close the joint space ZS below and to the sides, grout G is pressed into one of the multiple communication passages 58C to begin filling. The grout G then first fills the internal space of one beam reinforcement joint part 54C in which the one communication passage 58C is formed via the one communication passage 58C, and then flows out from the internal space of the one beam reinforcement joint part 54C into the joint space ZS. Because the joint space ZS is closed below and to the sides by the joint formwork 90, the outflowing 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 of the other beam reinforcement joints 54 other than the one beam reinforcement joint 54C. The grout G continuously flows into the internal space of the other beam reinforcement joints 54, passes through the connecting passages 58 communicating with the internal space, and is then discharged from the surfaces 51s, 51t of the beam member 5. In this manner, the grout G is continuously filled into the internal space of each beam reinforcement joint 54. Once the internal space is filled with grout G, it is finally discharged from the connecting passages 58 communicating with the internal space. In other words, if there is a connecting passage 58 from which grout G is not discharged, it is considered that the internal space of the beam reinforcement joint 54 corresponding to the connecting passage 58 may not be sufficiently filled with grout G. In this way, it is possible to easily confirm that the grout G has been evenly filled into the internal space of each beam reinforcement joint portion 54. Furthermore, the joint space ZS, the internal space of each beam reinforcement joint portion 54, and the communicating passages 58 formed for each beam reinforcement joint portion 54 are all in a state of communication, so when filling the grout G as described above, it is only necessary to press and fill the grout G into only one communicating passage 58C of the multiple communicating passages 58, and basically there is no need to press and fill the grout G into the other communicating passages 58. Therefore, the 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 is possible to confirm that grout G has been evenly filled in the joint, and it is possible to realize a grout filling method that allows grout G to be easily filled.

[0040] For example, if the communication passage 58 extends from the through hole 54h in the beam reinforcement joint 54 to the end face 5f, connecting the internal space of the beam reinforcement joint 54 to the outside from the end face 5f, the end face 5f forms a joint space ZS. When grout G is filled into the joint space ZS, the opening of the communication passage 58 may be blocked by the grout G. In this case, it becomes impossible to confirm the discharge of grout from the opening of the communication passage 58. Furthermore, it is possible that grout G may flow back into the communication passage 58 from the opening provided in the end face 5f of the communication passage 58, blocking the communication passage 58 and preventing the air in the internal space from escaping. This may prevent grout G from being properly filled into the internal space of the beam reinforcement joint 54. In response to this, the communication passage 58 can be configured as described above to extend from the through hole 54h opened in the beam reinforcement joint portion 54 to surfaces 51s, 51t other than the end face 5f, thereby connecting the internal space of the beam reinforcement joint portion 54 to the outside from surfaces 51s, 51t other than the end face 5f, thereby preventing the above-mentioned situation from occurring.

[0041] In particular, in this embodiment, in each beam reinforcement joint part 54, the through holes 54h are provided in both the part where a gap is formed between the inner surface of the beam reinforcement joint part 54 and the outer surface of the beam main reinforcement 52 when one end 52s of the beam main reinforcement 52 is inserted in the axial direction of the beam reinforcement joint part 54, and the part where a gap is formed between the inner surface of the beam reinforcement joint part 54 and the outer surface of the beam main reinforcement 52 when the ends of the connecting beam main reinforcement 27A, 27B are inserted. According to the above configuration, when filling grout G, one end 52s of the beam main reinforcement 52 is inserted in the axial direction of the beam reinforcement joint 54, and if it is confirmed that grout G is being discharged 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 beam main 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 beam main reinforcement 52, and the beam main reinforcement 52 has been normally joined to the beam reinforcement joint 54. Furthermore, when filling the grout G, the ends of the connecting beam main reinforcements 27A and 27B are inserted in the axial direction of the beam reinforcement joint 54, and if it is confirmed that the grout G is being discharged from the connecting passage 58 corresponding to the through hole 54h provided at 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 reinforcements 27A and 27B is located, this means that the grout G has been filled between the inner surface of the beam reinforcement joint 54 and the outer surface of the connecting beam main reinforcements 27A and 27B, and the connecting beam main reinforcements 27A and 27B have been successfully joined to the beam reinforcement joint 54. In this way, it can be confirmed that the beam main reinforcement 52 and the connecting beam main reinforcement 27A, 27B are properly connected.

[0042] Furthermore, in the above-mentioned grout filling method, the grout G is continuously filled into the joint space ZS and the internal space of the beam reinforcement joint section 54, so that any air pockets in the joint space ZS or the internal space of the beam reinforcement joint section 54 can be reliably discharged outside the beam member 5 through the connecting passage 58.

[0043] In addition, a joint width ensuring means 81 having a predetermined length is provided on either the surface of the column member 2 (tip surface 25f of the protrusion 25) or the end surface 5f of the beam member 5, which form the joint space ZS, and protrudes toward the other by a predetermined length so as to maintain the width of the joint space ZS constant, and a separation prevention means 82 is provided on the column member 2 and the beam member 5, which prevents the column member 2 and the beam member 5 from separating due to the pressure when filling the grout G, by joining the column member 2 and the beam member 5. According to this configuration, 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 can be maintained constant without narrowing. Furthermore, by joining the column member 2 and the beam member 5 with the separation suppression means 82, the column member 2 and the beam member 5 are prevented from separating due to the pressure applied when filling with grout G. Therefore, the joint space ZS can be filled with grout G to form the joint Z 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 allows for improved accuracy of the width of the joint Z and the beam member 5 after filling the joint space ZS with grout G.

[0044] Furthermore, a protruding portion 25 is formed on the portion of the pillar member 2 facing the end face 5f of the beam member 5 so as to protrude toward the end face 5f and have the same shape as the end face 5f. According to this configuration, a protruding portion 25 having the same shape as the end face 5f and protruding toward the end face 5f is formed on the portion of the column member 2 facing the end face 5f of the beam member 5, so that a joint form 90 for forming the joint Z can be installed along the outer peripheral surface of the protruding portion 25 and the outer peripheral surface of the beam member 5. This makes it possible to fasten and fix the joint form 90 from the outside by providing, for example, a tightening band or a frame material so as to surround the joint form 90 from the outside, and tightening the joint form 90 toward the protruding portion 25 or the beam member 5 from the outside. This makes it easy to install the joint form 90.

[0045] The grout filling method of the present invention is not limited to the above-described embodiment explained with reference to the drawings, and various modifications are possible within the technical scope. For example, in the above embodiment, each step has been described as a method for constructing the beam-column frame 1, but the order of execution and detailed procedures can be changed as appropriate. 3, the lowest beam reinforcement joint 54 on the right side of the drawing is regarded as one beam reinforcement joint 54C, and the grout G is pressed into one communication passage 58C provided for that one beam reinforcement joint 54C, but this is not limited to this. As already explained, the joint space ZS, the internal space of each beam reinforcement joint 54, and the communication passages 58 formed for each beam reinforcement joint 54 are all connected to form one space, so it basically does not matter which of the multiple communication passages 58 the grout G is pressed into. In addition, the configurations given in the above embodiments can be selected or changed as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0046] 2, 2A, 2B Column members 52, 52A, 52B Beam main reinforcement 5 Beam member 52s One end of member 5c Center of beam 54, 54C Beam reinforcement joint 5f End face 54h Through hole 5s Beam end 58, 58C Communication path 21s Side 58C One connecting passage 25 Projection 81 Means for securing joint width 25f Tip surface (surface of column member) 82 Separation suppression means 27A, 27B Joint beam main reinforcement 90 Joint formwork 51 Concrete G Grout 51s, 51t surface ZS joint space

Claims

1. A grout filling method for filling grout into a joint between a column member and a beam member of a precast concrete structure, comprising: In the column member, a plurality of connecting beam main reinforcements 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 in the beam end portion, and one end of the main beam reinforcement embedded in the beam member is inserted into the end portion of each of the beam reinforcement joints on the beam center side, and at the end portion on the beam end side, the internal space is connected to the outside at the end face of the beam member, and for each of the beam reinforcement joints, a communication passage is formed that extends from a through hole opened in the beam reinforcement joint to a surface other than the end face, connecting the internal space to the outside, The beam members are provided opposite each other at a distance so that the end faces form a joint space between the beam members and the column members, and the corresponding connecting beam main reinforcement is inserted into each of the beam reinforcement joint portions, The connecting beam main reinforcement, the beam reinforcement joint portion, and the beam main reinforcement are provided on both the upper and lower sides of the beam member, In some of the beam reinforcement joints provided on the upper side, the internal space communicates with the outside from the top surface of the beam member by the communication passage provided for the beam reinforcement joint, and in other of the beam reinforcement joints provided on the upper side and the beam reinforcement joints provided on the lower side, the internal space communicates with the outside from the side surface of the beam member by the communication passage provided for the beam reinforcement joint, a joint form installation process of installing a joint form so as to close the lower and lateral sides of the joint space; a grout filling step in which the grout is pressed into one of the plurality of communication passages to start filling, and then the filling of the grout is stopped after it is confirmed that the grout has been discharged from all of the communication passages other than the one communication passage; A grout filling method comprising:

2. A joint width securing means having the predetermined length is provided on either the surface of the column member or the end face of the beam member, which forms the joint space, so that the joint width securing means protrudes by a predetermined length toward the other and can maintain a constant width of the joint space; The column member and the beam member are provided with a separation prevention means that prevents the column member and the beam member from separating due to the pressure when filling the grout by joining the column member and the beam member, The separation suppression means includes a fixing metal fitting having an L-shaped cross section and bolted to the upper and lower surfaces of the beam member, and a bolt connecting the fixing metal fitting to a side surface of the column member.

2. The grout filling method according to claim 1.

3. A protrusion having the same shape as the end face is formed on the portion of the column member facing the end face of the beam member so as to protrude toward the end face.

3. The grout filling method according to claim 1 or 2.

Images