JP6389650B2 - Precast foundation construction jig and construction method - Google Patents

Description

  The present invention relates to a precast foundation construction jig for supporting a precast foundation in a standing posture at a foundation construction place, and a precast foundation construction method using the precast foundation construction jig.

Conventionally, in the construction of a continuous foundation with a half-precast structure where the rising part is made of a precast foundation and the base part is made of cast-in-place concrete body, a precast foundation construction jig that supports the precast foundation in an upright position at the foundation construction site has been used. ing. As this precast foundation construction jig, for example, one shown in FIG. 10 has been proposed (Patent Document 1).
The precast foundation 11 needs to be supported so that the main reinforcement 12 embedded in the cast-in-place concrete body is joined to the loose reinforcement 14 and protrudes downward, so that the main reinforcement 12 does not interfere. for that reason,
The precast foundation construction jig 31 projects two leg portions 33 from an attachment portion 32 attached to the bottom surface of the precast foundation 11 so that both leg portions 33, 33 straddle the main reinforcement 12. The leg portion 33 has a lower end widening portion 34 extending from the lower end in the thickness direction of the precast foundation 11, and the lower end widening portion 34 is placed on the 0 base support surface 20 in a state where the height of the leg portion 33 is increased. A bolt 39 for adjusting the height is screwed.

  In the construction of a continuous foundation using the precast foundation construction jig 31, the precast foundation construction jig 31 supports the precast foundation 11 in an upright posture, and the main bars 12 at the lower ends located directly below the precast foundations arranged in a column. , 12 are joined together by a lap joint formed by a joint rebar 15.

JP 2012-2111496 A JP 2013-227787 A JP 2010-70903 A JP 2002-212957 A Japanese Patent Laid-Open No. 10-168899 JP-A-8-326065 JP-A-7-286332 JP 7-113240 A

  In the precast foundation construction jig 31 having the above-described configuration, the leg portion 33 is in a state of straddling the lower end main reinforcement 12 positioned directly below the precast foundation 11. Therefore, it is necessary to insert the lower end main reinforcing bar 12 in the basic longitudinal direction in order to attach the joint reinforcing bar 15 that joins the adjacent lower main reinforcing bars 12 and 12 with the lap joint to the lower end main reinforcing bar 12, and it takes time for the alignment work. There is a problem.

  Further, since the lower end widened portion 34 extending from the lower end of the leg portion 33 in the thickness direction of the precast base 11 is formed of a monotonous plate-like member having a rectangular end section, the bar 21 is used as shown in FIG. Thus, in the operation of moving the precast foundation 11 laterally, it is difficult to put the burl 21 under the lower end widened portion 34. That is, if the burl 21 is to be inserted deeply under the lower end widened portion 34, the burl 21 needs to be laid and inserted as shown in FIG. Further, as shown in FIG. 11B, when the gap d ′ between the lower end widened portion 34 and the base support surface 20 is narrow, the burl 21 cannot be put under the lower end widened portion 34.

  The object of the present invention is to facilitate the placement work of the joint reinforcing bar that connects the main bar protruding downward of the precast foundation to the main bar protruding downward of the adjacent precast foundation, and can improve the workability of the construction of the precast foundation. It is to provide a precast foundation construction jig and construction method.

The precast foundation construction jig of the premise structure is composed of a precast foundation whose rising part is a precast concrete body, the base part is made of cast-in-place concrete body, the main reinforcement of the base part located directly below the precast foundation, and the lower end are A precast foundation construction jig that supports the precast foundation in an upright position at a foundation construction place in a continuous foundation in which a plurality of ribs coupled with the main reinforcement protrude from the lower end of the precast foundation,
A receiving portion attached to the lower surface of the precast foundation; a leg portion falling from the receiving portion; and a lower end widening portion extending in a thickness direction of the precast foundation from a lower end of the leg portion, Located on the side of the main bar located directly below the precast foundation, on the side of the leg where the main bar is located, a joint reinforcing bar joined to the main bar with the main bar is joined to the main bar from the side. It has a laterally open space that can be introduced so as to approach it.

  According to this structure, it has the side open space which can introduce a joint reinforcing bar to the side of a jig leg part. Therefore, the joint rebar can be introduced from the side so as to be close to the main reinforcement, and the operation of joining the main reinforcements arranged directly under the precast foundations arranged in a column with a lap joint can be performed efficiently. .

In this invention, the height adjusting unit to adjust the height of the leg portions in a state loaded was the underlying support surface to construct the continuous foundation may be kicked set to the lower expanded portion.
In the case of this configuration, the height of the precast foundation can be adjusted by adjusting the height of the leg by the height adjusting unit.

Precast foundation construction jig of the first aspect of this inventions is Oite the premise construction, the legs, the intermediate portion in the height direction are bent or curved so as biased in the direction of the thickness of the precast foundation The main bar is positioned on the side which is an intermediately-biased shape and which is on the opposite side of the leg . In other words, the side shape of the precast foundation construction jig may be Σ-shaped.
In the case of this configuration, even if the leg portion is positioned at the center in the thickness direction of the precast foundation, interference with the main bar of the base portion positioned at the center in the thickness direction is avoided due to the intermediately offset shape of the leg portion. Is done. Therefore, the precast foundation can be supported with good balance.

In this invention, the said leg part may be equipped with the pressing surface part which hold | maintains the said joint reinforcement on the said main reinforcement by pressing the said joint reinforcement arrange | positioned on the said main reinforcement from the upper direction. In the case of this configuration, the joint reinforcing bar is sandwiched and fixed between the main reinforcing bar and the pressing surface part. For this reason, it is not necessary for the operator to manually support the joint rebar during the connection work using the binding wire of the joint rebar, and it is possible to more easily join the main bars by the lap joint.

In this invention, the said receiving part may extend to one side of the thickness direction of the said precast foundation with respect to the said leg part, and the U shape extended to the both sides of the said thickness direction at the said lower end part may be sufficient. Also in this configuration, a side open space is formed on the side where the main bars of the leg are located so that the joint reinforcing bars joined by the lap joint along the main bars can be introduced from the side so as to approach the main bars.
In this invention, the said receiving part and the said lower end extended part may be an e-shape extended to the both sides of the thickness direction of the said precast foundation with respect to the said leg part. In the case of this configuration, the overall shape of the precast foundation construction jig is simplified.

Precast foundation construction jig of the second invention in the inventions are Oite the premise construction, the end portion of the lower expanded portion, is inclined cross section that forms a larger tool insertion space recessed in accordance reach the lower It has been kicked set.
In the case of this configuration, it is easy to insert a tool such as a bar below the lower end widened portion, and it is easy to adjust the position of the precast foundation with the tool.

The precast foundation construction method of the present invention comprises a precast foundation in which the rising portion is a precast concrete body, the base portion is composed of a cast-in-place concrete body, the main reinforcement of the base portion located directly below the precast foundation, and the lower end is the above-mentioned In a continuous foundation with multiple ribs protruding from the lower end of the precast foundation, the precast foundation is installed in a standing position at the foundation construction place, and a joint reinforcing bar is connected to the main reinforcement with a lap joint A precast foundation construction method
A process of attaching a precast foundation construction jig to the lower surface of the precast foundation, a process of placing a precast foundation to which the precast foundation construction jig is attached on a foundation construction surface, and binding the joint rebar along the main reinforcement The precast foundation construction jig has a leg portion located on a side of the main reinforcement of the precast foundation, and the leg portion has an intermediate portion in the height direction. It is an intermediate biased shape that is bent or curved so as to be biased in the thickness direction of the precast foundation, and the main bar is positioned on the side that is the anti-bias side of the leg in the process of coupling to the main bar. To do .
Another precast foundation construction method according to the present invention includes a precast foundation whose rising portion is a precast concrete body, a base portion which is a cast-in-place concrete body, a main bar of the base portion located directly below the precast foundation, and a lower end In a continuous foundation in which a plurality of stirrups connected to the main bar protrude from the lower end of the precast foundation, the precast foundation is installed in a standing position at the foundation construction place and is connected to the main bar by a lap joint. A precast foundation construction method for arranging
The process of attaching the precast foundation construction jig to the lower surface of the precast foundation, the process of placing the precast foundation to which the precast foundation construction jig is attached on the foundation support surface, and binding the joint rebar to the main reinforcement The precast foundation construction jig includes a leg portion located on a side of the main reinforcement of the precast foundation, and a thickness direction of the precast foundation from a lower end of the leg portion. A process of disposing the precast foundation on the base support surface, comprising a sloped cross-section having a tool insertion space that is greatly recessed toward the lower side at the end of the lower end extension, In the process of inserting the tool from the inclined cross section under the lower end widened portion, laterally moving the precast foundation, and connecting to the main bar , The joint rebar, close to the main reinforcement from the side of the main reinforcement of the leg portion is positioned, characterized in that Sowaseru the main reinforcement.

  According to this construction method, the joint reinforcing bars are brought closer to the main bars from the side where the main bars of the legs are located, so that the main bars are placed under the precast foundations arranged in tandem. The joining work can be performed efficiently.

The base portion precast foundation construction jig of the first aspect of this inventions is the rising portion consists of precast foundation is precast concrete bodies, the base portion is made of cast-in-place concrete bodies, located beneath the precast foundation This is a precast foundation construction jig that supports the precast foundation in a standing position at the foundation construction place in a continuous foundation in which a plurality of ribs with lower ends coupled to the principal reinforcement protrude from the lower end of the precast foundation. A receiving portion attached to the lower surface of the precast foundation, a leg portion falling from the receiving portion, and a lower end extending portion extending in a thickness direction of the precast foundation from a lower end of the leg portion, and the leg portion Is located on the side of the main muscle located directly below the precast foundation, and the main muscle of the leg is Laterally to location, the coupling reinforcing bars to be joined by the joint overlaid Sowase the main reinforcement from the side so as to approach the main reinforcement having a deployable lateral open space (assuming configuration), the legs, Since the intermediate portion in the height direction is bent or curved so as to be biased in the thickness direction of the precast foundation, and the main bar is located on the side opposite to the side of the leg , the precast The arrangement work of the joint reinforcement which connects the main reinforcement projected below the foundation with the main reinforcement projected below the adjacent precast foundation can be performed easily, and the joining work by the lap joint between the main reinforcements can be performed efficiently .
In the precast foundation construction jig according to the second aspect of the present invention, in the premise configuration, an inclined cross-sectional portion that forms a tool insertion space that is greatly recessed toward the lower side is provided at the end of the lower end widened portion. Further, it is possible to easily arrange the joint reinforcing bars connecting the main bars protruding below the precast foundation to the main bars protruding below the adjacent precast foundation, and to efficiently perform the joining work of the main bars by the lap joint.

The precast foundation construction method of the present invention comprises a precast foundation in which the rising portion is a precast concrete body, the base portion is composed of a cast-in-place concrete body, the main reinforcement of the base portion located directly below the precast foundation, and the lower end is the above-mentioned In a continuous foundation in which a plurality of ribs connected to the main bar protrudes from the lower end of the precast foundation, the precast foundation is installed in a standing position at the foundation construction place, and a joint reinforcing bar is connected to the main bar with a lap joint. A precast foundation construction method, a process of attaching a precast foundation construction jig to the lower surface of the precast foundation, a process of arranging a precast foundation to which the precast foundation construction jig is attached on a foundation support surface, and the joint Join a reinforcing bar to the main bar with a binding wire along the main bar And a degree, the precast foundation construction jig, said has a leg portion located on the side of the main reinforcement of the precast foundation, the legs, the thickness direction of the intermediate portion in the height direction is the precast foundation an intermediate bias bent shape or curved so biased, the order to position the said main reinforcement laterally to become anti-biased end of the leg portion at the process of coupling to the main reinforcement, main reinforcement projecting downward precast foundation It is possible to easily arrange the joint reinforcing bars connecting the main bars protruding below the adjacent precast foundation, and to efficiently perform the joining work of the main bars by the lap joint .
Another precast foundation construction method according to the present invention includes a precast foundation whose rising portion is a precast concrete body, a base portion which is a cast-in-place concrete body, a main bar of the base portion located directly below the precast foundation, and a lower end In a continuous foundation in which a plurality of stirrups connected to the main bar protrude from the lower end of the precast foundation, the precast foundation is installed in a standing position at the foundation construction place and is connected to the main bar by a lap joint. Is a precast foundation construction method for placing a precast foundation construction jig on the lower surface of the precast foundation, and a process for placing the precast foundation on which the precast foundation construction jig is attached on the foundation support surface, Connect the joint reinforcing bar to the main bar with a binding wire along the main bar The precast foundation construction jig includes a leg portion located on a side of the main bar of the precast foundation, and a lower end widening portion extending from the lower end of the leg portion in the thickness direction of the precast foundation. And having an inclined cross-sectional portion that forms a tool insertion space that is largely recessed toward the lower side at the end of the lower end widened portion, and in the process of arranging the precast foundation on the foundation support surface, In the process of laterally moving the precast foundation from the inclined cross-section portion and below the lower end widened portion and joining to the main bar, the joint reinforcing bar is moved from the side where the main bar of the leg is located to the main bar. Since the main bars that protrude downward from one precast foundation are connected to the main bars close to each other, it is easy to place joint reinforcing bars that connect the main bars that protrude downward from the adjacent precast foundation. , It can be performed efficiently bonding work by lap joint of the main reinforcement together.

It is a longitudinal cross-sectional view of the continuous foundation constructed using the precast foundation construction jig of this invention. It is a partial front view of the same continuous foundation. It is a perspective view of the precast foundation construction jig concerning a 1st embodiment of this invention. It is a front view which shows the state which supported the precast foundation in the standing posture with the same precast foundation construction jig. It is explanatory drawing of operativity in the case of carrying out lateral movement operation of the precast foundation supported with the same precast foundation construction jig using a bar. It is a front view which shows the state which supported the precast foundation in the standing posture with the precast foundation construction jig concerning other embodiment of this invention. It is a front view which shows the state which supported the precast foundation in the standing posture with the precast foundation construction jig concerning further another embodiment of this invention. It is a front view which shows the state which supported the precast foundation in the standing posture with the precast foundation construction jig concerning further another embodiment of this invention. It is a front view which shows the state which supported the precast foundation in the standing posture with the precast foundation construction jig concerning further another embodiment of this invention. It is a front view which shows the prior art example of a precast foundation construction jig. It is explanatory drawing of operativity in the case of carrying out lateral movement operation of the precast foundation supported with the same precast foundation construction jig using a bar.

A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a longitudinal sectional view of a continuous foundation constructed using the precast foundation construction jig of this embodiment, and FIG. 2 shows a partial front view of the continuous foundation. The continuous foundation 10 has a half precast structure in which the rising portion 10A is a precast concrete body and the base portion 10B is a spot cast concrete body. A plurality of precast foundations 11 are arranged in a column. A main bar 12 of the base portion 10B is arranged just below the precast foundation 11, and a plurality of ribs 14 whose lower ends are welded to the main bar 12 protrude from the lower end of the precast base 11.
The main muscle 12 becomes the lower end muscle of the continuous foundation. The main reinforcing bars 12, 12, which are arranged underneath the adjacent precast foundations 11, are joined to each other by a lap joint where the main reinforcing bars 12 are attached with joint reinforcing bars 15 and are bound by a binding wire 16. The main bars 13 arranged at the upper part of each precast foundation 11 are connected by a mechanical joint (not shown).

  Each precast foundation 11 is erected on a foundation support surface 20 for constructing the continuous foundation 10 at a foundation construction place as shown in FIG. 4 using the precast foundation construction jig 1 of this embodiment shown in FIG. Supported by This precast foundation construction jig 1 is made of a cast product, and includes a receiving part 2 attached to the lower surface of the precast foundation 11, a leg part 3 falling from the receiving part 2, and a thickness of the precast foundation 11 from the lower end of the leg part 3. And a plate-like lower end widening portion 4 extending in the vertical direction. The leg part 3 is composed of two leg part constituting materials 3A, 3A arranged in the longitudinal direction of the precast foundation 11, and these leg part constituting parts 3A, 3A are formed on the common receiving part 2 and the lower end widening part 4. in the process of. The leg 3 is located on the side of the main muscle 12 located just below the precast foundation 11.

  The receiving portion 2 is provided with two bolt insertion holes 6 through which the bolts 5 that connect the receiving portion 2 to the lower surface of the precast foundation 11 are inserted in the thickness direction of the precast foundation 11. Correspondingly, two high nuts 7 into which the bolts 5 are screwed are embedded in the lower end portion of the precast foundation 11 as shown in FIG. Thereby, the receiving part 2 is coupled to the lower surface of the precast foundation 11.

The leg 3 is located on the side of the main muscle 12 that is located directly below the precast foundation 11. That is, the leg portion 3 has an intermediate biased shape, specifically, a Σ-shape that is bent or curved so that an intermediate portion in the height direction is biased in the thickness direction of the precast foundation 11. The main muscle 12 is positioned on the side that is the opposite side.
When the leg portion 3 has such a Σ-shape, even if the leg portion 3 is positioned at the center in the thickness direction of the precast foundation 11, the leg portion 3 is positioned at the center in the thickness direction due to the intermediately offset shape of the leg portion 3. Interference with the main muscle 12 of the base part to be performed is avoided. Therefore, the precast foundation 11 can be supported with good balance.

  The lower end widening portion 4 is a plate-like portion extending in the thickness direction of the precast foundation 11, and is a height adjusting portion that adjusts the height of the leg portion 3 in the screw holes at both ends in the longitudinal direction. The adjusting bolt 9 is screwed. The height of the leg portion 3 is adjusted by turning the height adjusting bolt 9 in a state where the precast foundation construction jig 1 is placed on the foundation support surface 20 constituting the continuous foundation 10 of FIG. be able to.

  An inclined cross section 4a that forms a tool insertion space that is greatly recessed toward the lower side at the end portion in the thickness direction of the precast foundation 11 and the end portion in the longitudinal direction of the precast foundation 11 in the lower end widening portion 4. Is provided. Here, the inclined cross-sectional portion 4a is provided at both ends in the longitudinal direction and the width direction of the lower end widened portion 4, but only the end portion in the width direction is provided only at the end portion in the longitudinal direction. May be provided.

The construction method of the said continuous foundation 10 using this precast foundation construction jig 1 is performed as follows.
First, the receiving part 2 of the precast foundation construction jig 1 is attached to the lower surface of the precast foundation 11 using the bolts 5. Next, the precast foundation 11 to which the precast foundation construction jig 1 is attached is disposed on the foundation support surface 20. Next, as shown in FIG. 2, the joint reinforcing bar 15 is attached to the main bar 12 with the binding wire 16 along the main bar 12. Since the precast foundation construction jig 1 has the leg portion 3 located on the side of the main bar 12 as described above, the joint reinforcing bar 15 is moved closer to the main bar 12 from the side where the main bar 12 of the leg portion 3 is located. 12, the construction efficiency of the precast foundation construction can be increased.

  Further, in this embodiment, the inclined cross section 4a is provided at the end in the thickness direction of the precast foundation 11 and the end in the longitudinal direction of the precast foundation 11 in the lower end widened portion 4, so that FIG. In the operation of laterally moving the precast foundation 11 using a tool such as the bar 21 as described above, the bar 21 can be easily placed under the lower end widened portion 4 and the lateral movement operation of the precast foundation 11 can be easily performed. For example, the conventional precast foundation construction jig 31 shown in FIG. 10 does not have the inclined cross section 4a at the lower end widened portion 34, and therefore, the base support surface 20 and the lower end widened portion 34 as shown in FIG. In order to insert the bar 21 deeply into the gap d (insertion amount L), the bar 21 needs to be laid down (inclination angle θ). On the other hand, in the precast foundation construction jig 1 of this embodiment, since the inclined cross section 4a is provided at the lower end widening portion 4, the bar 21 is inserted by the same insertion amount L as shown in FIG. The inclination angle of the bar 21 can be increased (2θ). Further, when the inclination angle of the burl 21 is set to the same angle θ as that of the conventional precast foundation construction jig 31, the insertion amount can be increased (2L) as shown in FIG. Thereby, the horizontal movement operation by the bar 21 can be easily performed. Moreover, in the conventional precast foundation construction jig 31, when the gap d ′ between the foundation support surface 20 and the lower end widened portion 34 becomes small as shown in FIG. 11B, the burl 21 cannot be inserted. In the form of the precast foundation construction jig 1 having the inclined cross-sectional portion 4a in the lower end widening portion 4, even when the gap d ′ becomes small, the burl 21 is securely inserted as shown in FIG. Can do.

  FIG. 6 shows another embodiment of the present invention. In this embodiment, in the previous embodiment shown in FIGS. 1 to 5, the joint rebar 15 placed on the main bar 12 is pressed from above on the leg 3, and the joint bar 15 on the main bar 12 is pressed. Is provided with a holding surface portion 3a. Other configurations are the same as those in the previous embodiment.

  As described above, when the pressing surface portion 3a is provided on the leg portion 3, the main reinforcing bar 12 is welded to the stirrup muscle 14, so that the joint reinforcing bar 15 is sandwiched and fixed between the main reinforcing rod 12 and the pressing surface portion 3a. The Therefore, it is not necessary for the operator to support the joint rebar 15 by hand during the connection work of the joint rebar 15 using the binding wire. For this reason, joining of the main bars 12 and 12 by a lap joint can be performed more easily.

  FIG. 7 shows still another embodiment of the present invention. In this embodiment, the precast foundation construction jig 1 is not a cast product as in the previous embodiment shown in FIGS. 1 to 5, but a plurality of members are joined by welding or the like to form a Σ-shape as a whole. Consists of things. In the case of this configuration, the precast foundation construction jig 1 can be manufactured as a plan. Other configurations and operational effects are the same as in the previous embodiment.

  FIG. 8 shows still another embodiment of the present invention. In this embodiment, the receiving part 2 is extended to one side of the thickness direction of the precast foundation 11 with respect to the leg part 3, and the lower end widened part 4 has a U-shape extending to both sides in the thickness direction. Other configurations are the same as those in the previous embodiment.

  Even in such a configuration, the side of the leg 3 where the main reinforcing bar 12 is positioned can be introduced so that the joint reinforcing bar 15 joined to the main reinforcing bar 12 by the lap joint is brought close to the main reinforcing bar 12 from the side. An open space 8 is formed. Thereby, since the joint reinforcement 15 can be made to approach the main reinforcement 12 near the main reinforcement 12 from the side where the main reinforcement 12 of the leg part 3 is located, the construction efficiency of precast foundation construction can be raised.

  FIG. 9 shows still another embodiment of the present invention. In this embodiment, the receiving portion 2 and the lower end widening portion 4 are both in an E shape extending to both sides of the precast foundation 11 in the thickness direction with respect to the leg portion 3. Other configurations are the same as those in the previous embodiment.

  Even in such a configuration, the side of the leg 3 where the main reinforcing bar 12 is positioned can be introduced so that the joint reinforcing bar 15 joined to the main reinforcing bar 12 by the lap joint is brought close to the main reinforcing bar 12 from the side. An open space 8 is formed. Thereby, since the joint reinforcement 15 can be made to approach the main reinforcement 12 near the main reinforcement 12 from the side where the main reinforcement 12 of the leg part 3 is located, the construction efficiency of precast foundation construction can be raised.

DESCRIPTION OF SYMBOLS 1 ... Precast foundation construction jig 2 ... Receiving part 3 ... Leg part 3a ... Pressing surface part 4 ... Lower end spread part 4a ... Inclined cross-section part 8 ... Side open space 9 ... Height adjustment bolt (height adjustment part)
DESCRIPTION OF SYMBOLS 10 ... Continuous foundation 10A ... Rising part 10B ... Base part 11 ... Precast foundation 12 ... Main reinforcement 14 ... Stirrup 15 ... Joint reinforcement 16 ... Bundling wire 20 ... Foundation support surface

Claims (8)

The rising portion is made of a precast foundation that is a precast concrete body, the base portion is made of a cast-in-place concrete body, the main reinforcement of the base portion that is located directly below the precast foundation, and a plurality of ribs that have lower ends coupled to the main reinforcement. A precast foundation construction jig that supports the precast foundation in a standing position at a foundation construction place in a continuous foundation in which a line protrudes from the lower end of the precast foundation,
A receiving portion attached to the lower surface of the precast foundation; a leg portion falling from the receiving portion; and a lower end widening portion extending in a thickness direction of the precast foundation from a lower end of the leg portion, Located on the side of the main bar located directly below the precast foundation, on the side of the leg where the main bar is located, a joint reinforcing bar joined to the main bar with the main bar is joined to the main bar from the side. The leg portion has a laterally open space that can be introduced so as to approach the leg portion, and the leg portion has an intermediate bias shape that is bent or curved so that an intermediate portion in a height direction is biased in a thickness direction of the precast foundation. A precast foundation construction jig in which the main reinforcement is positioned on the side that is on the opposite side of the surface . The rising portion is made of a precast foundation that is a precast concrete body, the base portion is made of a cast-in-place concrete body, the main reinforcement of the base portion that is located directly below the precast foundation, and a plurality of ribs that have lower ends coupled to the main reinforcement. A precast foundation construction jig that supports the precast foundation in a standing position at a foundation construction place in a continuous foundation in which a line protrudes from the lower end of the precast foundation,
A receiving portion attached to the lower surface of the precast foundation; a leg portion falling from the receiving portion; and a lower end widening portion extending in a thickness direction of the precast foundation from a lower end of the leg portion, Located on the side of the main bar located directly below the precast foundation, on the side of the leg where the main bar is located, a joint reinforcing bar joined to the main bar with the main bar is joined to the main bar from the side. has can be introduced laterally open space so as to approach the lower end of the end portion of the expanded portion, larger recessed tool insertion space precast foundation construction jig inclined cross section is eclipsed set to form a according to reach the lower . The precast foundation construction jig according to claim 1 or 2 , wherein a height adjusting portion that adjusts a height of the leg portion in a state of being placed on a foundation support surface that constructs the continuous foundation is the lower end widening portion. precast foundation construction jig was kicked set in. In precast foundation construction jig according to any one of claims 1 to 3, wherein the leg portion, the joint reinforcement on the main reinforcement presses the joint reinforcement arranged on the main reinforcement from above Precast foundation construction jig with a holding surface that holds In precast foundation construction jig according to 請 Motomeko 2, the receiving portion extends to one side in the thickness direction of the precast foundation to the leg portion, and the lower expansion portion extends to both sides of the thickness direction Pre-cast foundation construction jig that is U-shaped. In 請 Motomeko 2 precast foundation construction jig according to the leg portion and the receiving portion and the lower expanded portion are both relative to, precast foundation construction is e-shaped extending on both sides in the thickness direction of the precast foundation jig. The rising portion is made of a precast foundation that is a precast concrete body, the base portion is made of a cast-in-place concrete body, the main reinforcement of the base portion that is located directly below the precast foundation, and a plurality of ribs that have lower ends coupled to the main reinforcement. In a continuous foundation in which a bar protrudes from the lower end of the precast foundation, the precast foundation is installed in a standing posture at a foundation construction place, and a precast foundation construction method in which a joint reinforcing bar connected by the lap joint is arranged with the main bar,
The process of attaching the precast foundation construction jig to the lower surface of the precast foundation, the process of placing the precast foundation to which the precast foundation construction jig is attached on the foundation support surface, and binding the joint rebar to the main reinforcement The precast foundation construction jig has a leg portion located on a side of the main reinforcement of the precast foundation, and the leg portion has an intermediate portion in the height direction. It is an intermediate biased shape that is bent or curved so as to be biased in the thickness direction of the precast foundation, and the main bar is positioned on the side that is the anti-bias side of the leg in the process of coupling to the main bar. Precast foundation construction method. The rising portion is made of a precast foundation that is a precast concrete body, the base portion is made of a cast-in-place concrete body, the main reinforcement of the base portion that is located directly below the precast foundation, and a plurality of ribs that have lower ends coupled to the main reinforcement. In a continuous foundation in which a bar protrudes from the lower end of the precast foundation, the precast foundation is installed in a standing posture at a foundation construction place, and a precast foundation construction method in which a joint reinforcing bar connected by the lap joint is arranged with the main bar,
The process of attaching the precast foundation construction jig to the lower surface of the precast foundation, the process of placing the precast foundation to which the precast foundation construction jig is attached on the foundation support surface, and binding the joint rebar to the main reinforcement The precast foundation construction jig includes a leg portion located on a side of the main reinforcement of the precast foundation, and a thickness direction of the precast foundation from a lower end of the leg portion. A process of disposing the precast foundation on the base support surface, comprising a sloped cross-section having a tool insertion space that is greatly recessed toward the lower side at the end of the lower end extension, In the process of inserting the tool from the inclined cross section under the lower end widened portion, laterally moving the precast foundation, and connecting to the main bar The joint reinforcement, precast foundation construction method, characterized in that Sowaseru the main reinforcement from the side of the main reinforcement of the leg portion is positioned closer to the main reinforcement.

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