JP2015031036A - Construction method of precast member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a precast member capable of improving a degree of freedom of a joining method between a second precast member and a column member, while reducing labor of drawing work of a mechanical joint, in the present invention.SOLUTION: The construction method of the precast member comprises a first process of inserting and connecting a beam main reinforcement 24 projecting from an upper column member 12A into and to a fixed mechanical joint 36 embedded in one end part 30A of an upper beam member 30, by moving the upper beam member 30 in the lateral direction to the upper column member 12A, a second process of placing an upper column member 12B on a lower column member 14B by lowering from above on the other end part 30B side of the upper beam member 30 and a third process of connecting a beam main reinforcement 34 embedded in the upper beam member 30 and the beam main reinforcement 24 embedded in a column-beam connection part 16 of the upper column member 2B by a weld joint.

Description

  The present invention relates to a method for constructing a precast member.

  A precast concrete beam member in which a sheath tube that houses a mechanical joint (sleeve joint) is embedded in the beam end portion, and a precast concrete column member in which the sheath tube is embedded in a column connection portion A joint structure of a concrete member is known (for example, see Patent Document 1).

  In the joint structure disclosed in Patent Document 1, after arranging the beam member between the pair of column members, by pulling out the mechanical joint from the beam end portions on both sides and inserting it into the sheath tube of the column connection portion, The beam reinforcement of the beam member is connected to the beam reinforcement (column reinforcement) in the column joint.

  Moreover, the joining structure of the precast column beam which joins a column member and a precast beam member via a precast column beam joint part is known (for example, refer patent document 2).

  In the joint structure disclosed in Patent Document 2, the precast beam member is moved in the lateral direction with respect to the precast column beam joint, and the beam reinforcing bar protruding from the precast column beam joint is embedded in one end of the precast beam member. By inserting into the formed sleeve, the beam reinforcing bars of the precast column beam joint and the precast beam member are connected to each other.

  A precast column beam joint member placed on the precast column member is joined to the other end of the precast beam member. Specifically, the precast column beam joint member is moved laterally with respect to the other end portion of the precast beam member on the upper side of the precast column member, and the precast column beam joint member is embedded in the sleeve embedded in the other end portion. By inserting the beam reinforcing bars protruding from the beam reinforcing bars, the beam reinforcing bars of the precast beam member and the precast column beam joint member are connected to each other.

JP 2012-132203 A JP 2009-121083 A

  In the technique disclosed in Patent Document 1, since mechanical joints are pulled out from the beam ends on both sides of the beam member, there is room for improvement from the viewpoint of workability.

  In the technique disclosed in Patent Document 2, as described above, when the precast column beam joint member is joined to the other end of the precast beam member, the precast column beam joint member is disposed above the precast column member. Move horizontally. Therefore, the column reinforcement cannot be protruded upward from the upper surface of the precast column member. If the column reinforcement protrudes upward from the upper surface of the precast column member, the column reinforcement will interfere with the precast column beam connection member when the precast column beam connection member is moved laterally above the precast column member. It is. Therefore, in the technique disclosed in Patent Document 2, there is room for improvement in that the method for joining the precast column member and the precast column beam joint member is limited.

  In view of the above facts, the present invention provides a precast member construction method capable of improving the degree of freedom of the method of joining the second precast member and the column member while reducing the labor of pulling out the mechanical joint. The purpose is to obtain.

  The construction method of the precast member according to claim 1 moves the precast beam member in the lateral direction with respect to the first precast member, and projects from either one of the first precast member and one end of the precast beam member. A first step of inserting and connecting a beam main bar to a fixed mechanical joint embedded in either one of the first precast member and one end of the precast beam member; and on the other end side of the precast beam member, A second step of lowering the second precast member from above and placing the second precast member on the column member, and connecting the beam principal bars of the precast beam member and the second precast member by a weld joint, or of the precast beam member A movable mechanical joint is pulled out from either one of the other end and the second precast member and moved to the other, and the precast beam portion And a, and a third step of connecting the beams main reinforcement together with the second precast member with.

  According to the construction method of the precast member according to claim 1, in the first step, the precast beam member is moved laterally with respect to the first precast member, and one of the first precast member and one end of the precast beam member The main beam protruding from one side is inserted and connected to a fixed mechanical joint embedded in one of the other ends of the first precast member and the precast beam member. Therefore, it is not necessary to move the mechanical joint as in the prior art (for example, Patent Document 1) on the one end side of the precast beam member. Therefore, the trouble of pulling out the mechanical joint is reduced.

  On the other hand, in the third step, the beam main bars of the precast beam member and the second precast member are connected by a welded joint. Alternatively, the movable mechanical joint is pulled out from one of the other end of the precast beam member and the second precast member and moved to the other to connect the beam main bars of the precast beam member and the second precast member.

  Therefore, unlike the prior art (for example, Patent Document 2), it is not necessary to move the second precast member in the lateral direction with respect to the other end of the precast beam member. Therefore, in the second step, the second precast member can be lowered from the upper side to the other end side of the precast beam member and placed on the column member.

  Accordingly, even if the column main bar protrudes from the upper surface of the column member, for example, by forming an insertion hole into which the column main bar is inserted into the second precast member, A precast member can be placed. Therefore, the freedom degree of the joining method of a 2nd precast member and a column member can be improved.

  The construction method of the precast member according to claim 2 is the construction method of the precast member according to claim 1, wherein each of the first precast member and the second precast member is on a material axis of the precast beam member. It has the column beam joint part arrange | positioned and the column part extended below from the said column beam joint part.

  According to the construction method of the precast member which concerns on Claim 2, the freedom degree of the joining method of the pillar part and pillar member of a 2nd precast member can be improved.

  The precast member construction method according to claim 3 is the precast member construction method according to claim 1 or 2, wherein the second precast member is another precast beam from the side opposite to the precast beam member. The member is moved in the lateral direction, and the beam main bar protruding from one end of the second precast member or the other precast beam member is either one of the second precast member or one end of the other precast beam member. Or a fourth step of inserting and connecting to a fixed mechanical joint embedded in the other.

  According to the precast member construction method according to claim 3, in the fourth step, another precast beam member is moved laterally from the side opposite to the precast beam member with respect to the second precast member, and the second precast member and The main beam projecting from one of the one end portions of the other precast beam members is inserted and connected to a fixed mechanical joint embedded in one of the other end portions of the second precast member and the other precast beam members. Thereafter, the frame can be constructed in order by repeating the second to fourth steps.

  As described above, according to the construction method of the precast member according to the present invention, the degree of freedom of the joining method between the second precast member and the column member is improved while reducing the labor of pulling out the mechanical joint. Can do.

It is an elevation view which shows the frame constructed by the construction method of the precast member which concerns on one Embodiment of this invention. (A) is an enlarged elevation view showing a state before joining the one end portion of the upper beam member shown in FIG. 1 and the column beam joint portion of the upper column member, and (B) is one end portion of the upper beam member. It is an enlarged elevation view which shows the state after joining with the column beam joint part of an upper column member. (A) is an enlarged elevation view showing a state before joining the other end portion of the upper beam member shown in FIG. 1 and the column beam joint portion of the upper column member, and (B) is another view of the upper beam member. It is an enlarged elevation view which shows the state after joining an edge part and the column beam joint part of an upper column member. (A)-(C) are elevation views explaining the construction method of the precast member concerning one embodiment of the present invention. (A) And (B) is an elevation view explaining the modification of the construction method of the precast member which concerns on one Embodiment of this invention. FIGS. 3A and 3B are modified examples of the method of joining the other end portion of the upper beam member and the column beam joint of the upper column member shown in FIG. FIG. (A)-(C) are elevations which show the modification of the upper pillar member shown by FIG.

  Hereinafter, the construction method of the precast member which concerns on one Embodiment of this invention is demonstrated, referring drawings.

  FIG. 1 shows a frame 10 constructed by the precast member construction method according to the present embodiment. The frame 10 includes a pair of upper column members 12A and 12B made of precast concrete (hereinafter referred to as “PCa”), and an upper beam member 30 made of PCa and installed on the pair of upper column members 12A and 12B. Yes.

  The upper column member 12A as the first precast member and the upper column member 12B as the second precast member are respectively installed on the pair of lower column members 14A and 14B. A pair of lower column members 14A and 14B is provided with a lower beam member 32 constituting the frame 10.

  Since the upper column member 12A and the upper column member 12B have the same configuration, the upper column member 12A will be described below, and the description of the upper column member 12B will be omitted as appropriate. Similarly, since the upper column members 12A and 12B and the lower column members 14A and 14B have the same configuration, description of the lower column members 14A and 14B will be omitted as appropriate. Furthermore, since the upper beam member 30 and the lower beam member 32 have the same configuration, the upper beam member 30 will be described, and the description of the lower beam member 32 will be omitted as appropriate.

  As shown in FIG. 1, the upper column member 12 </ b> A has a substantially rectangular cross section, and extends downward from the column beam joint 16 to which the upper beam member 30 is joined, and the column beam joint 16. And a column portion 18. The column beam joint portion 16 and the column portion 18 are formed integrally with each other without a step. A step may be formed between the column beam joint 16 and the column 18.

  A plurality of column main bars 20 are embedded in the upper column member 12A along the material axis direction of the upper column member 12A. The upper end portion of each column main reinforcement 20 protrudes upward from the upper surface of the column beam joint portion 16. On the uppermost floor, the upper end portion of the column main reinforcement 20 does not protrude from the upper surface of the column beam joint portion 16. On the other hand, the lower end portion of each column main bar 20 is inserted into a cylindrical fixed mechanical joint 22 embedded in the lower end portion of the column portion 18. Note that a shear reinforcement bar (not shown) or the like is appropriately embedded in the upper column member 12A.

  As shown in FIGS. 2A and 2B, the column beam joint 16 of the upper column member 12 </ b> A is disposed on the material axis of the upper beam member 30. In the column beam joint 16, a plurality of beam main bars 24 are embedded along the material axis direction of the upper beam member 30. These beam main bars 24 are arranged according to beam main bars 34 of the upper beam member 30 described later.

  One end of the beam main bar 24 protrudes from one side surface 16A of the column beam joint 16 (upper beam member 30 side). On the other hand, the other end portion of the beam main bar 24 is disposed in a groove portion 26 formed on the other side surface 16B of the column beam joint portion 16 (on the side opposite to the upper beam member 30). The shape and size of the groove 26 can be changed as appropriate. Further, when the beam member is not joined to the side surface 16B of the column beam joint portion 16, the groove portion 26 becomes unnecessary.

  As shown in FIG. 1, the upper beam member 30 is disposed between the column beam joints 16 of the pair of upper column members 12A and 12B. The upper beam member 30 is formed to have a substantially rectangular cross section, and a plurality of beam main bars 34 are embedded therein along the material axis direction of the upper beam member 30. The beam main bar 34 arranged on the upper end side of the upper beam member 30 is an upper end bar, and the beam main bar 34 arranged on the lower end side of the upper beam member 30 is a lower end bar.

  As shown in FIGS. 2A and 2B, one end of the beam main bar 34 is inserted into a cylindrical fixed mechanical joint 36 embedded in one end 30 </ b> A of the upper beam member 30. . This fixed mechanical joint 36 has an insertion hole into which one end of the beam main bar 24 protruding from the column beam joint 16 of the upper column member 12 </ b> A is inserted in one end surface of the upper beam member 30. In the state where one end of the beam main bar 24 is inserted into the fixed mechanical joint 36, the beam main bar 24 between the column beam joint 16 and the upper beam member 30, 34 are joined together.

  Further, a gap 40 for connection between the upper beam member 30 and the column beam joint portion 16 is formed between one end surface of the upper beam member 30 and the side surface 16A of the column beam joint portion 16. The gap 40 is also filled with a filler 38. Note that a filling hole and a discharge hole (not shown) for the filler that lead to the inside of the fixed mechanical joint 36 are formed at one end portion 30 </ b> A of the upper beam member 30.

  As shown in FIG. 3, the other end of the beam main bar 34 is disposed in a groove 42 formed on the other end surface of the other end 30 </ b> B of the upper beam member 30. As a result, the beam main bar 34 and the beam main bar 24 of the upper column member 12B face each other. Moreover, the groove part 42 can couple | bond the beam main bars 24 and 34 of the upper pillar member 12B and the upper beam member 30 by the welding joint from the side surface side of the upper beam member 30, for example.

  Further, a gap 44 for connecting the upper beam member 30 and the column beam joint 16 is formed between the other end surface of the upper beam member 30 and the side surface 16B of the column beam joint 16. The gap 44 and the grooves 26 and 42 are filled with a filler 38. In addition, the black circle in FIG. 3 has shown the welding part. Further, the shape and size of the groove 42 can be changed as appropriate.

  Next, an example of the construction method of the precast member of this embodiment is demonstrated.

First, the first step will be described.
FIG. 4A shows a state where the upper column member 12A as the first precast member is installed on the lower column member 14A. From this state, as shown in FIG. 4 (B), the upper beam member 30 is lifted by a hoisting machine (not shown) and moved laterally with respect to the column beam joint 16 of the upper column member 12A. A plurality of beam main bars 24 protruding from the column beam joint 16 are inserted and connected to a plurality of fixed mechanical joints 36 embedded in one end 30A of the upper beam member 30, respectively. The upper beam member 30 is supported by a support work (not shown).

  Next, as shown in FIG. 2B, a filler 38 is filled into each fixed mechanical joint 36 from a filling hole (not shown) formed in one end 30A of the upper beam member 30, and cured. Thereby, the beam main bars 24 and 34 of the upper beam member 30 and the column beam joint portion 16 are coupled to each other. The filling of the filling material 38 into the fixed mechanical joint 36 is confirmed by discharging the filling material 38 from a discharge hole (not shown) formed in the one end portion 30 </ b> A of the upper beam member 30.

  Next, a tube form or the like (not shown) is temporarily installed along the outer peripheral edge of the one end surface of the upper beam member 30, and the gap 40 between the one end surface of the upper beam member 30 and the side surface 16A of the column beam joint portion 16 is filled. Fill material 38 and cure. Thereby, the one end part 30A of the upper beam member 30 and the column beam joint part 16 are joined. Thereafter, the tube formwork and the like are removed. Note that other formwork may be used instead of the tube formwork.

Next, the second step will be described.
As shown in FIG. 4B, the lower column member is lifted by lifting the upper column member 12B as the second precast member with a lifting machine or the like (not shown) and lowering it from the upper side to the other end 30B side of the upper beam member 30. It is placed on the column beam joint 16 of 14B. At this time, the plurality of column main bars 20 protruding upward from the column beam joint 16 of the lower column member 14B are respectively inserted into the plurality of fixed mechanical joints 22 embedded in the lower end portion of the column 18 of the upper column member 12B. And connect.

  Next, a filling material is filled into the inside of the fixed mechanical joint 22 from a filling hole (not shown) formed in the lower end portion of the column portion 18 of the upper column member 12B, and is cured. Thereby, the column main reinforcing bars 20 of the upper column member 12B and the lower column member 14B are joined. Further, a filler is filled in the gap between the lower surface of the column portion 18 of the upper column member 12B and the upper surface of the column beam joint portion 16 of the lower column member 14B and is cured. Thereby, the column part 18 of the upper column member 12B and the column beam joint 16 of the lower column member 14B are joined.

Next, the third step will be described.
As shown in FIG. 3, the beam main bar 34 exposed in the groove 42 of the other end 30B of the upper beam member 30 and the beam main bar 24 exposed in the groove 26 of the column beam joint 16 of the upper column member 12B are welded. Connect with a joint. Next, the filling material 38 is filled in each of the grooves 26 and 42 and the gap 44 and cured. As a result, the other end 30B of the upper beam member 30 and the column beam joint 16 of the upper column member 12B are joined. In addition, the filling method of the filler 38 with respect to the clearance gap 44 is performed using the tube form etc. which were mentioned above.

Next, the fourth step will be described.
As shown in FIG. 4 (C), the other upper beam member 30 is lifted by a lifting machine or the like (not shown), and the other beam beam joint 16 of the upper column member 12B is moved from the opposite side to the other side from the upper beam member 30. By moving the upper beam member 30 in the lateral direction, a plurality of beam main bars 24 protruding from the column beam joint 16 are connected to a plurality of fixed mechanical joints 36 embedded in one end 30A of the other upper beam member 30. Insert and connect each. Thereafter, as in the first step, each fixed mechanical joint 36 and the gap 40 are filled with the filler 38, and the column beam joint 16 of the upper column member 12B and one end 30A of the upper beam member 30 are joined. To do.

  Thereafter, the plurality of frames 10 are constructed in order by repeating the second to fourth steps. In addition, said construction procedure may be changed suitably or may perform a some procedure in parallel. For example, in the second step, after the main beam bars 24 and 34 of the upper column member 12A and the upper beam member 30 are combined, the main column bars 20 of the upper column member 12B and the lower column member 14B may be combined. These may be performed in parallel.

  As described above, according to the present embodiment, in the first step, the upper beam member 30 is moved in the lateral direction with respect to the column beam joint portion 16 of the upper column member 12A, and the beam protruding from the column beam joint portion 16 is used. The main bar 24 is inserted into and connected to a fixed mechanical joint 36 embedded in one end 30 </ b> A of the upper beam member 30. Therefore, unlike the prior art (for example, Patent Document 1), there is no need to pull out the mechanical joint from the one end 30A of the upper beam member 30. Therefore, the trouble of pulling out the mechanical joint is reduced.

  Here, from the viewpoint of reducing the labor of pulling out the mechanical joint, the mechanical joint is embedded in the other end portion 30B of the upper beam member 30 as in the conventional technique (for example, Patent Document 2), and the upper column The beam main reinforcement 24 protrudes from the column beam joint portion 16 of the member 12B, and the upper column member 12B is moved in the lateral direction with respect to the other end portion 30B of the upper beam member 30, whereby the other end portion 30B. It is conceivable to connect the main beam 24 of the column beam joint 16 to the mechanical joint.

  However, in this embodiment, the column main reinforcement 20 protrudes upward from the column beam joint 16 of the lower column member 14B. In this case, when the upper column member 12B is moved in the lateral direction with respect to the other end portion 30B of the upper beam member 30, the column main bar 20 interferes with the column portion 18 of the upper column member 12B. Therefore, the upper column member 12B cannot be moved in the lateral direction with respect to the other end 30B of the upper beam member 30. The same applies to the case where the column main reinforcement 20 protrudes downward from the lower surface of the column portion 18 of the upper column member 12B. Therefore, the joining method of the upper column member 12B and the lower column member 14 is limited.

  Considering this, in the third embodiment, in the third step, the beam main bars 24 and 34 of the other end portion 30B of the upper beam member 30 and the column beam joint portion 16 of the upper column member 12B are joined together by a welded joint. . Therefore, it is not necessary to move the upper column member 12B in the lateral direction with respect to the other end 30B of the upper beam member 30.

  Thus, in the second step, when the upper column member 12B is installed on the other end 30B side of the upper beam member 30, the upper column member 12B is lowered from the upper side to the other end 30B side of the upper beam member 30, and the column The column main reinforcement 20 of the lower column member 14B can be inserted and connected to the fixed mechanical joint 22 of the portion 18. The same applies to the case where the column main reinforcement 20 protrudes downward from the lower surface of the column portion 18 of the upper column member 12B. Therefore, the freedom degree of the joining method of the upper pillar member 12B and the lower pillar member 14B can be improved.

  Moreover, in this embodiment, since the frame 10 is constructed in order by repeating the steps 2 to 4, the construction procedure is simplified. Therefore, the workability of the frame 10 can also be improved.

  Next, a modification of the above embodiment will be described.

  In the said embodiment, although the example constructed in order of 12 A of upper pillar members, the upper beam member 30, the upper pillar member 12B, and the other upper beam member 30 was shown, it is not restricted to this. For example, as shown in FIGS. 5 (A) and 5 (B), when two adjacent frames 10 are constructed, the following may be performed. In the following, for convenience of explanation, the upper column member 12 and the lower column member 14 shown in FIG. 5B are referred to as upper column members 12A, 12B, and 12C and lower column members 14A, 14B, and 14C in order from the left. Further, the upper beam members 30 are referred to as upper beam members 30L and 30R in order from the left.

  First, as shown in FIG. 5A, upper column members 12A and 12C as first precast members located on both sides of the central upper column member 12B (see FIG. 5B) are used as lower column members 14A, Install each on 14C. At this time, each of the upper column members 12A and 12C is installed with the beam main bars 24 protruding from the column beam joint 16 facing the upper column member 12B side in the center.

  Next, in the first step, the upper beam member 30L is lifted by a lifting machine (not shown) and disposed between the upper column members 12A and 12C on both sides, and the column beam joint portion of one (left side) upper column member 12A. 16, the plurality of beam main bars 24 protruding from the column beam joint 16 are respectively inserted into the plurality of fixed mechanical joints 36 embedded in the one end 30A of the upper beam member 30L. Connect. Then, each fixed mechanical joint 36 and the gap 40 (see FIG. 2) are filled with the filler 38, and the column beam joint 16 and the one end 30A of the upper beam member 30L are joined. The upper beam member 30L is supported by a support work (not shown).

  Next, the upper beam member 30R is lifted by a lifting machine (not shown) and disposed between the other upper column member 12C and the upper beam member 30L, and is transverse to the column beam joint 16 of the upper column member 12C. By moving in the direction opposite to the upper beam member 30L, the plurality of beam main bars 24 protruding from the column beam joint 16 are attached to the plurality of fixed mechanical joints 36 embedded in one end 30A of the upper beam member 30R. Insert and connect each. Then, each fixed mechanical joint 36 and the gap 40 (see FIG. 2) are filled with the filler 38, and the column beam joint 16 and the one end 30A of the upper beam member 30R are joined. The upper beam member 30R is supported by a support work (not shown).

  Next, in the second step, as shown in FIG. 5B, the upper column member 12B is lifted by a lifting machine (not shown), and the other end 30B of the upper beam member 30L and the other end of the upper beam member 30R. It is lowered from above between 30B and placed on the column beam joint 16 of the lower column member 14B. At this time, the plurality of column main bars 20 protruding upward from the column beam joint 16 of the lower column member 14B are respectively inserted into the plurality of fixed mechanical joints 22 embedded in the lower end portion of the column 18 of the upper column member 12B. And connect. Then, each of the fixed mechanical joints 22 is filled with a filler, and the gap between the lower surface of the column portion 18 of the upper column member 12B and the upper surface of the column beam joint portion 16 of the lower column member 14B is filled with the filler. The column part 18 and the column beam joint part 16 are joined.

  Next, in the third step, the other beam end 30B of the upper beam member 30L and the beam main bars 24, 34 of the column beam joint 16 of the upper column member 12B are joined together by a welded joint. And each groove part 26,42 (refer FIG. 3) and the clearance gap 44 are filled with the filler 38, and the other end part 30B of the upper beam member 30L and the column beam joint part 16 of the upper column member 12B are joined. Similarly, the main beam bars 24 and 34 of the other end portion 30B of the upper beam member 30R and the column beam joint portion 16 of the upper column member 12B are joined together by a welded joint. And each groove part 26,42 (refer FIG. 3) and the clearance gap 44 are filled with the filler 38, and the other end part 30B of the upper beam member 30R and the column beam joint part 16 of the upper column member 12B are joined.

  In this way, in the third step, the upper column member 12B is installed between the other end 30B of the upper beam member 30L and the other end 30B of the upper beam member 30R, whereby the upper beam member 30L and the upper column member 12B. The beam main reinforcing bars 24 and 34 and the beam main reinforcing bars 24 and 34 of the upper beam member 30R and the upper column member 12B can be integrated into the central upper column member 12B. Therefore, the workability is improved.

  Moreover, in the said embodiment, the example which inserted and connected the beam main reinforcement 24 which protrudes from the column beam joint part 16 of 12 A of upper column members to the fixed mechanical coupling 36 embed | buried in the one end part 30A of the upper beam member 30 was connected. On the contrary, the main beam 34 protruding from the one end 30A of the upper beam member 30 is inserted into the fixed mechanical joint embedded in the column beam joint 16 of the upper column member 12A. You may do it.

  In the above-described embodiment, an example in which the beam main bar 34 of the upper beam member 30 and the beam main bar 24 of the upper column member 12B are coupled by a welded joint has been described. For example, as shown in FIGS. 6 (A) and 6 (B), the movable mechanical joint 50 accommodated in the other end 30B of the upper beam member 30 is pulled out, and the column beam joint portion of the upper column member 12B is pulled out. The main beam bars 24 and 34 of the upper beam member 30 and the column beam joint 16 may be connected to each other.

  Specifically, as shown in FIG. 6A, a plurality of sheath tubes 52 that accommodate the movable mechanical joint 50 are embedded in the other end portion 30 </ b> B of the upper beam member 30. Each sheath tube 52 is formed in a cylindrical shape, and is embedded in the other end 30 </ b> B of the upper beam member 30 so as not to protrude from the other end surface of the upper beam member 30. Further, the other end portion of the beam main bar 34 is inserted into each sheath tube 52. By these sheath tubes 52, an accommodation portion for accommodating the movable mechanical joint 50 is formed at the other end portion 30 </ b> B of the upper beam member 30. The movable mechanical joint 50 is accommodated in the sheath tube 52 so that the other end portion of the beam main bar 34 is inserted therein and does not protrude from the other end surface of the upper beam member 30.

  A plurality of sheath tubes 62 into which the movable mechanical joint 50 drawn from the other end 30B of the upper beam member 30 is inserted are embedded in the column beam joint 16 of the upper column member 12B. Each sheath tube 62 is formed in a cylindrical shape, and is embedded in the column beam joint 16 so as not to protrude from the side surface 16B of the column beam joint 16. These sheath tubes 62 form an insertion hole into which the movable mechanical joint 50 is inserted in the side surface 16 </ b> B of the column beam joint 16. Further, one end portion of the beam main bar 24 is inserted into each sheath tube 62.

  Here, a method of connecting the beam main bars 24 and 34 of the upper beam member 30 and the upper column member 12B will be described. First, in a state where the other end 30B of the upper beam member 30 and the column beam joint 16 of the upper column member 12B are positioned, the movable mechanical joint 50 is connected from the sheath tube 52 of the other end 30B of the upper beam member 30. The drawer is inserted into the sheath tube 62 of the column beam joint 16. At this time, the main beam 24 is inserted into the movable mechanical joint 50, and the movable mechanical joint 50 is arranged and connected so as to straddle the two main beams 24 and 34. In this state, the inside of the movable mechanical joint 50 is filled with the filler 38 and cured. Thereby, the beam main bars 24 and 34 of the upper beam member 30 and the column beam joint portion 16 are coupled to each other. Further, the sheath material 52, 62 and the gap 44 are filled with a filler 38 and cured. As a result, the other end 30B of the upper beam member 30 and the column beam joint 16 of the upper column member 12B are joined.

  In this way, by pulling the movable mechanical joint 50 from the other end 30B of the upper beam member 30 and moving it to the column beam joint 16 of the upper column member 12B, the upper beam member 30 and the column beam joint 16 The beam main bars 24 and 34 can be connected to each other. Therefore, workability is improved as compared with a welded joint.

  6A and 6B show an example in which the movable mechanical joint 50 is housed in the sheath tube 52 of the upper beam member 30, the sheath of the column beam joint 16 is shown. The movable mechanical joint 50 may be accommodated in the pipe 62. In this case, by pulling the movable mechanical joint 50 from the column beam joint 16 and moving it to the other end 30B of the upper beam member 30, the beam main bars 24 between the upper beam member 30 and the column beam joint 16 are provided. 34 can be connected to each other.

  The movable mechanical joint 50 only needs to be able to insert the main beam bars 24 and 34 from both sides. For example, a female screw into which the main beam bars 24 and 34 are screwed into the inner peripheral surface of a sleeve (hollow tube) is cut. It is also possible to use a screw-in type mechanical joint or an insertion-type mechanical joint in which a female screw is not cut on the inner peripheral surface of the sleeve. Moreover, it is also possible to use together the modified example shown in FIG. 6 (A) and FIG. 6 (B) and the weld joint mentioned above.

  Moreover, in the said embodiment, the column main reinforcement 20 which protrudes from the upper surface of the column beam joint part 16 of the lower column member 14B is inserted in the fixed mechanical joint 22 embed | buried under the lower end part of the column part 18 of the upper column member 12B. However, the present invention is not limited to this. For example, the column main reinforcement 20 protruding downward from the lower surface of the column portion 18 of the upper column member 12B may be inserted and connected to the fixed mechanical joint embedded in the column beam joint portion 16 of the lower column member 14B. .

  Moreover, in the said embodiment, although the example using the upper column member 12A, 12B which has the column beam joint part 16 and the column part 18 was shown as a 1st precast member and a 2nd precast member, it does not restrict to this. . The first precast member and the second precast member may have at least the column beam joint 16 made of PCa. For example, as shown in FIG. Alternatively, the column member 80 in which the beam portion 70 is integrated may be used, or the column member 82 in which the beam portion 70 is integrated on both sides of the column beam joint portion 16 may be used. When the beam portion 70 is provided in the column beam joint portion 16 in this way, the connection position between the beam main bars 24 and 34 can be shifted from the beam end having a large moment to the beam center side having a small moment.

  Further, for example, as shown in FIG. 7B, the first precast member and the second precast member may be beam members 84 and 86 formed by the column beam joint portion 16 and the beam portion 70. As shown in FIG. 8C, a column beam joint member 88 formed by the column beam joint portion 16 may be used.

  Note that a plurality of sheath tubes 64 penetrating the column beam joint portion 16 in the vertical direction are embedded in the column beam joint portion 16 of the beam members 84 and 86 and the column beam joint member 88. The column beam joint 16 and the column member 90 are joined by passing through the column main bars 20 protruding upward from the upper surface of the column member 90 and filling the sheath tube 64 with the filler. Note that the column member 90 may be made of PCa or may be formed of cast-in-place concrete.

  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention will be described. Of course, various embodiments can be implemented without departing from the scope.

12A Upper pillar member (first precast member)
12B Upper pillar member (second precast member)
14B Lower pillar member (pillar member)
16 Column beam joint 18 Column 24 Beam main bar 34 Beam main bar 30 Upper beam member (Precast beam member)
30L Upper beam member (Precast beam member)
30R Upper beam member (Precast beam member)
30A One end 30B The other end 36 Fixed mechanical joint 50 Movable mechanical joint 80 Column member (first precast member, second precast member)
82 Column member (first precast member, second precast member)
84 Column member (first precast member, second precast member)
86 Beam members (first precast member, second precast member)
88 Column beam joint member (first precast member, second precast member)
90 Column members

Claims (3)

A precast beam member is moved in the lateral direction with respect to the first precast member, and the main beam projecting from one of the first precast member and one end of the precast beam member is moved to the first precast member and the precast beam member. A first step of inserting and connecting to a fixed mechanical joint embedded in either one of the one end of
A second step of lowering the second precast member from above on the other end side of the precast beam member and placing it on the column member;
The main beam bars of the precast beam member and the second precast member are connected to each other by a welded joint, or the movable mechanical joint is pulled out from one of the other end of the precast beam member and the second precast member, and the other. A third step of connecting the beam main bars of the precast beam member and the second precast member;
Construction method of precast member having Each of the first precast member and the second precast member is
A column beam joint disposed on the material axis of the precast beam member;
A column portion extending downward from the column beam joint,
Having
The construction method of the precast member of Claim 1. The other precast beam member is moved laterally from the side opposite to the precast beam member with respect to the second precast member, and protrudes from one end of the second precast member or the other precast beam member. A fourth step of inserting and connecting a beam main bar to a fixed mechanical joint embedded in one of the other ends of the second precast member and the other precast beam member;
The construction method of the precast member of Claim 1 or Claim 2.

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