JP2023101203A - GROUT INJECTION TOOL AND CONNECTION METHOD OF PCa MEMBER - Google Patents

Abstract

To provide a grout injection tool and a connection method of a PCa member that can efficiently and securely fill grout relative to every space where grout is filled.SOLUTION: A grout injection tool 50 is applied when a reinforcing-bar 65 is inserted to a sheath pipe 63 with which a precast-concrete-made PCa member 60 is provided, the grout injection tool is positioned to an end surface opening 63a of the sheath pipe 63 facing an end surface 61 of the PCa member 60, and grout is injected to the sheath pipe 63. The grout injection tool has a jig body 30 provided with a first end surface 32 abutting on the end surface opening 63a and a second end surface 33 located at an opposite side of the first end surface 32. The jig body 30 comprises an open hole 31 extending between a first end surface 32 and a second end surface 33, through which the reinforcing-bar 65 is penetrated, an injection hole 13 communicating with the open hole 31, in which grout is injected, and a slit 12 communicating with the injection hole 13 and extending along the open hole 31 between an intersecting position with the injection hole 13 and the first end surface 32.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for connecting a grouting jig and a PCa member.

For example, when constructing the column-to-beam joints of RC (Reinforced Concrete) columns and beams by placing concrete on site, lengthening the construction period is a problem, and this problem is even more pronounced in the case of high-rise buildings. Become. Therefore, the upper and lower pillars and the joints that connect both pillars, and the beams on the side of the joints are all made of precast concrete (hereinafter referred to as “PCa” as appropriate), and the PCa pillars and PCa joints are made of precast concrete. After transporting the PCa beams (both included in the PCa members) to the site and assembling the PCa columns and PCa joints, the PCa beams are temporarily installed on the left and right sides of the PCa joints, respectively, and the PCa joints are prepared. A reinforcing bar protruding sideways from the end face of one PCa beam is inserted into the sheath pipe to protrude to the other side of the PCa joint, and the reinforcing bar is fitted to the mechanical joint inside the other PCa beam. In some cases, a construction method is applied in which the PCa joints and the left and right PCa beams are mutually connected by joining them together.

In this connection method, after that, by injecting grout into the inside of the sheath pipe of the PCa joint or the inside of the mechanical joint that connects the reinforcing bars inside the PCa beam, the reinforcing bars and the sheath pipe or mechanical It is necessary to plan the connection with the joint. Therefore, for example, a method is applied in which a grout injection hole is provided in the mechanical joint, and grout injected from the injection hole is filled into spaces to be filled that communicate with each other. Specifically, the grout filled inside the mechanical joint flows and fills the vertical joint space at the interface between the PCa beam and the PCa joint provided with the mechanical joint, and then the sheath of the PCa joint It flows and fills the inside of the pipe, and flows and fills the longitudinal joint space between the PCa joint and the other PCa beam. The other PCa beam is provided with a discharge hole communicating with the vertical joint space, and by confirming that the grout that has flowed into the vertical joint space is discharged to the outside from the discharge hole, It can be determined that the grout is filled by

However, even if it can be confirmed that the grout injected from the injection hole is discharged from the discharge hole located away from the injection hole through various spaces to be filled, It cannot be said that it is necessarily guaranteed that the grout is densely filled in all spaces to be filled. It is quite possible that due to some influence, a part of the space to be filled is not filled with the grout, or the grout flows to the discharge hole and is discharged while the grout is insufficiently filled.

From the above, when connecting one PCa member provided with a sheath tube and the other PCa member having a reinforcing bar protruding from the end face, grout is applied to all spaces to be filled with grout. A method of connecting a grouting jig and a PCa member that can efficiently and reliably fill is desired.

Here, Patent Literature 1 proposes a precast beam member and a beam construction method thereof. The precast beam member has a large number of shear reinforcing bars embedded in the precast concrete at intervals, and a plurality of parallel sheath pipes for inserting the beam bottom main bar between the lower portions of the end faces of the two precast concretes. is embedded in each precast concrete, and splints are arranged in the central part of the sheath pipe to form a lap joint forming part. In the beam construction method of precast beam members, the beam bottom end main reinforcement is inserted into the beam member sheath pipe and erected between the top of the column in sequence, and the beam bottom end main reinforcement is moved and adjusted to pass between the end faces of the precast beam members on the top of the column. After the front and rear ends of the main reinforcing bars at the bottom of each beam are connected in the lap joint formation part, concrete is placed between the end faces of the precast beam members, and each sheath pipe is filled with grout material. It is a method of constructing

JP-A-5-247999

In the beam construction method of the precast beam member described in Patent Document 1, it is only described that the sheath pipe is filled with grout material and constructed. It does not disclose the means or method of filling the .

The present invention has been made in view of the above problems. It is an object of the present invention to provide a method for connecting a grouting jig and a PCa member that can efficiently and reliably fill a space to be filled with grout.

In order to achieve the above object, one aspect of the grouting jig according to the present invention is
It is applied when a reinforcing bar is inserted through a sheath pipe provided in a PCa member made of precast concrete and aligned with an end face opening of the sheath pipe facing the end face of the PCa member to inject grout into the sheath pipe. , a grouting fixture,
The grouting jig has a jig body having a first end face that contacts the end face opening and a second end face that is opposite to the first end face,
The jig body is
a through hole extending between the first end face and the second end face and through which the reinforcing bar is passed;
an injection hole that communicates with the through hole and into which the grout is injected;
It is characterized by comprising a slit communicating with the injection hole and extending along the through hole between a position intersecting the injection hole and the first end face.

According to this aspect, the through hole extends between the first end face of the PCa member that contacts the end face opening of the sheath tube and the second end face on the opposite side, through which the reinforcing bar is passed, and the grout communicates with the through hole. The jig body having the injection hole for injection further includes a slit communicating with the injection hole and extending along the through hole between a position intersecting the injection hole and the first end surface. , the grout injected into the injection hole can be guided to the sheath pipe through the slit, and the sheath pipe can be efficiently and reliably filled with the grout. Here, the PCa member provided with the sheath tube includes PCa joints, PCa beams, and the like. Here, the slit may extend parallel to the through-hole at a position apart from the through-hole, or may protrude to the side of the through-hole (communicating with the through-hole). good too.

In another aspect of the grouting jig according to the present invention,
The jig body includes a plurality of split bodies that split the through hole,
A plurality of divided main bodies are arranged so as to form the through-holes, and the plurality of divided main bodies are fastened with a fastening band.

According to this aspect, since the jig body is formed of a plurality of divided bodies that divide the through-hole, for example, after the reinforcing bar is inserted through the sheath tube of the PCa member, it protrudes from the end face opening of the sheath tube. By arranging a plurality of split main bodies so as to sandwich the reinforcing bars between them, the attachment of the grouting jig is improved. Here, the plurality of split bodies typically includes two half split bodies, but three or more split bodies may be applied.

In another aspect of the grouting jig according to the present invention,
The first end surface of the jig body is provided with a spacer that extends into the sheath tube, supports the reinforcing bar from below, and aligns the reinforcing bar inside the sheath tube. Characterized by

According to this aspect, the first end surface of the jig body is provided with the spacer that extends into the sheath tube and supports the reinforcing bar. The reinforcing bar can be lifted by the spacer and aligned with the sheath tube, for example in a central position, both for efficient placement of the spacer and for even and solid filling of the grout between the reinforcing bar and the inner surface of the sheath tube. realizable.

Another aspect of the grouting jig according to the present invention is
At least the jig body is made of hard resin.

According to this aspect, since the jig main body is made of a hard resin, it is lightweight and easy to handle while ensuring sufficient hardness to withstand grout injection pressure and the like. There is no fear of rusting unlike hardware, etc., and many diversions can be realized.

In addition, one aspect of the method for connecting PCa members according to the present invention is
A grouting jig having a jig body with a first end face and a second end face opposite to the first end face,
The jig body is
a through hole extending between the first end face and the second end face and through which a reinforcing bar is passed;
an injection hole that communicates with the through hole and into which grout is injected;
A1 step of preparing a grouting jig that communicates with the casting hole and has a slit that extends along the through hole between a position intersecting the casting hole and the first end surface;
A first reinforcing bar is passed through a sheath pipe provided in a first PCa member made of precast concrete, and a third end surface opening facing the sheath pipe on the third end surface of the first PCa member, and a fourth end surface of the first PCa member. from both of the fourth end face openings facing the sheath pipe, the first reinforcing bar is protruded, the first reinforcing bar is inserted into the through hole, the grouting jig is temporarily installed, and the second PCa member is provided A B1 step of connecting one end of the second reinforcing bar and one end of the first reinforcing bar via a mechanical joint and permanently installing the grouting jig at the position of the third end face opening;
While the first reinforcing bar overhanging from the fourth end face opening is penetrated through the through hole provided in the backer material or through the through hole of the separate grouting jig, the backer material or the separate C1 step of actually installing the grouting jig at the position of the fourth end face opening;
Grout is injected from the injection hole of one of the grout injection jigs, and the grout that has flowed through the slit and the sheath tube is injected into the slit of the backer material or the injection of the other grout injection jig. A D step of confirming that the grout has been discharged from the hole and completing the grout injection;
Concrete is placed between the first PCa member and the second PCa member so as to embed a portion of the first reinforcing bar, the mechanical joint, and a portion of the second reinforcing bar, and the first PCa member and and E step of connecting the second PCa member.

According to this aspect, by injecting grout into the inside of the sheath tube of the first PCa member through which the first reinforcing bar is inserted using the grouting jig of the present invention, the inside of the sheath tube can be efficiently and reliably grouted. can be filled with grout.

In addition, by confirming that the grout is discharged from the slit of the backer material installed at the other opening of the sheath pipe of the first PCa member or the injection hole of a separate grout injection jig, the tightness inside the sheath pipe can be confirmed. Real grouting can be guaranteed.

After the sheath tube of the first PCa member is filled with grout, the grout injection jig, backer material, and the like installed at the end opening of the sheath tube are removed. Next, one end of the first reinforcing bar inserted through and fixed to the sheath tube of the first PCa member and one end of the second reinforcing bar of the other second PCa member are connected by a mechanical joint, and grout is also applied to the inside of this mechanical joint. Alternatively, it is filled with epoxy resin or the like. Since the mechanical joint is a relatively short and small member, it is not necessary to use a grouting jig when filling the interior of the mechanical joint with grout or the like, and the first reinforcing bar and the second reinforcing bar are connected together. The grout or the like may be directly injected into the gap of the end opening of the mechanical joint. After the injection of grout, epoxy resin, etc. into the inside of the sheath pipe and the inside of the mechanical joint is completed, a part of the first reinforcing bar, the mechanical joint and the second The PCa members are connected by placing concrete so as to partially bury the reinforcing bars and connecting the first PCa member and the second PCa member.

For example, the first PCa member is a PCa joint, and the second PCa member is a PCa beam. At this time, the first reinforcing bar inserted through the sheath pipe of the PCa joint is projected to the left and right of the PCa joint, and one end of the second reinforcing bar provided on the left and right PCa beams and the left and right ends of the first reinforcing bar are connected. By connecting them with mechanical joints and placing concrete on the left and right of the PCa joints, the PCa beams extend to the left and right sides of the PCa joints assembled above the PCa columns. A letter-shaped column-to-beam joint is formed.

Another aspect of the method for connecting PCa members according to the present invention is
A grouting jig having a jig body with a first end face and a second end face opposite to the first end face,
The jig body is
a through hole extending between the first end face and the second end face and through which a reinforcing bar is passed;
an injection hole that communicates with the through hole and into which grout is injected;
a slit communicating with the injection hole and extending along the through hole between a position intersecting the injection hole and the first end surface;
A2 step of preparing a grouting jig in which the jig body is formed of a plurality of divided bodies dividing the through hole;
A first reinforcing bar is passed through a sheath pipe provided in a first PCa member made of precast concrete, and a third end surface opening facing the sheath pipe on the third end surface of the first PCa member, and a fourth end surface of the first PCa member. The first reinforcing bar extends from both of the fourth end face openings facing the sheath tube, and one end of the second reinforcing bar provided in the second PCa member and one end of the first reinforcing bar are connected via a mechanical joint, At the position of the third end face opening, disposing the plurality of divided bodies while forming the through holes so as to sandwich the first reinforcing bar, and fastening the circumference of the plurality of divided bodies with a fastening band A B2 step of forming and installing the grouting jig;
While the first reinforcing bar overhanging from the fourth end face opening is penetrated through the through hole provided in the backer material or through the through hole of the separate grouting jig, the backer material or the separate C2 step of permanently installing the grouting jig at the position of the fourth end face opening;
Grout is injected from the injection hole of one of the grout injection jigs, and the grout that has flowed through the slit and the sheath tube is injected into the slit of the backer material or the injection of the other grout injection jig. A D step of confirming that the grout has been discharged from the hole and completing the grout injection;
Concrete is placed between the first PCa member and the second PCa member so as to embed a portion of the first reinforcing bar, the mechanical joint, and a portion of the second reinforcing bar, and the first PCa member and and E step of connecting the second PCa member.

According to this aspect, by using the grouting jig formed by the divided main body, the attachment and detachment of the grouting jig are improved. Therefore, for example, the first reinforcing bar is inserted through the sheath tube of the first PCa member, and grout injection jigs for grout injection and grout discharge (discharge) are installed at the left and right end face openings, and further, before grout injection, the first reinforcing bar is inserted. After connecting the first reinforcing bar and the second reinforcing bar of the other second PCa member via the mechanical joint, grout injection into the sheath pipe and injection of grout, epoxy resin, etc. into the mechanical joint are continuously performed. can be done. After grouting, the grouting jig can be dismantled and removed while dividing the split main body, and the next step, which is to place concrete between the first PCa member and the second PCa member, can be performed.

In another aspect of the method for connecting PCa members according to the present invention,
In the B1 step or the B2 step, spacers are installed at least near the third end face opening and near the fourth end face opening in the lower part of the inside of the sheath tube,
The first reinforcing bar is supported from below by at least two spacers, and the first reinforcing bar is aligned inside the sheath tube.

According to this aspect, by installing at least two spacers inside the sheath tube to support the first reinforcing bar from below and aligning the first reinforcing bar inside the sheath tube, the first reinforcing bar can be placed inside the sheath tube. An annular space having as uniform a width as possible can be formed between the reinforcing bar and the inner surface of the sheath pipe and filled with grout, making it possible to achieve a strong connection between the first reinforcing bar and the sheath pipe.

In another aspect of the method for connecting PCa members according to the present invention,
In the A1 step or the A2 step, a spacer is provided on the first end face to extend into the sheath tube to support the reinforcing bar from below and align the reinforcing bar inside the sheath tube. , preparing the jig body,
In the B1 step, the B2 step, the C1 step, and the C2 step, when the two grouting jigs are actually installed at the positions of the third end face opening and the fourth end face opening, respectively, the spacer is It is characterized by being inserted into the inside of the sheath tube and supporting the first reinforcing bar from below.

According to this aspect, since the grouting jig is provided with the spacer that supports the first reinforcing bar inserted through the sheath pipe from below, when the grouting jig is installed in the end opening of the sheath pipe, , the spacer enters the sheath pipe and automatically lifts and supports the first reinforcing bar, so that the spacer can be efficiently installed on the sheath pipe.

As can be understood from the above description, according to the method of connecting a grouting jig and a PCa member of the present invention, one PCa member having a sheath tube and the other PCa member having a reinforcing bar protruding from the end face are connected. All spaces to be filled with grout can be efficiently and reliably filled with grout when connecting to each other.

1 is a perspective view of an example of a grouting jig according to a first embodiment; FIG. FIG. 2 is a view taken along the line IIa-IIa of FIG. 1; FIG. 2 is a view taken along line IIb-IIb of FIG. 1; FIG. 2 is a view taken along line IIc-IIc of FIG. 1; FIG. 7 is a perspective view of an example of a grouting jig according to a second embodiment; It is a process drawing of an example of the connection method of the PCa member which concerns on embodiment. FIG. 4 is a process diagram of an example of the method for connecting the PCa members according to the embodiment, following FIG. FIG. 5 is a process diagram of an example of the method for connecting the PCa members according to the embodiment, following FIG. FIG. 6 is a process diagram of an example of the method for connecting the PCa members according to the embodiment, following FIG. FIG. 7 is a process drawing of an example of the method for connecting the PCa members according to the embodiment, following FIG.

An example of a grouting jig according to each embodiment and an example of a method for connecting PCa members according to the embodiment will be described below with reference to the accompanying drawings. In addition, in the present specification and drawings, substantially the same components may be denoted by the same reference numerals, thereby omitting duplicate descriptions.

[Grout injection jig according to the first embodiment]
First, an example of a grouting jig according to a first embodiment will be described with reference to FIGS. 1 and 2. FIG. Here, FIG. 1 is a perspective view of an example of a grouting jig according to the first embodiment, and FIGS. and a view taken along the line IIc-IIc.

As will be described in detail below, the grouting jig 50 has reinforcing bars inserted through a sheath pipe provided in the PCa member made of precast concrete, and is aligned with the end face opening of the sheath pipe facing the end face of the PCa member. It is a jig applied when injecting grout into the sheath pipe.

The grouting jig 50 has a cylindrical jig body 30 having a first end face 32 that contacts the end face opening of the sheath tube and a second end face 33 that is opposite to the first end face 32 . A jig body 30 is formed by two split bodies 10 and 20 . Here, the jig body may be an integrally molded body as a whole, but as shown in the figure, it is formed of a plurality of split bodies 10 and 20 (two in the example shown), so that the grout injection tool can be It is preferable because the attachment and detachability of the tool 50 are improved, and the construction efficiency can be improved. Further, the outer shape of the jig main body may be a polygonal prism including a rectangular parallelepiped other than the cylinder shown in the illustrated example.

Half-split through holes 11 and 21 are provided at corresponding positions of the contact surfaces of the two semi-cylindrical split bodies 10 and 20, and the split bodies 10 and 20 are brought into contact with each other as shown in the figure. A through hole 31 is formed when this is done.

The through-hole 31 has the same or substantially the same cross-sectional dimension as the outer diameter of the first reinforcing bar to be inserted, and penetrates between the first end surface 32 and the second end surface 33 of the jig body 30 in the X direction. ing.

The jig body 30 is made of hard resin, for example, and specific materials include polyethylene (PE), polypropylene (PP), polyvinylidene fluoride (PVDF), and polyvinyl chloride (PVC). : Polyvinyl chloride), and hard rubbers such as ethylene propylene rubber (EPDM).

Since the jig main body 30 is made of a hard resin, it is lightweight and easy to handle while ensuring sufficient hardness to withstand grout injection pressure. There is no fear of rusting, and a large number of diversions can be realized. The jig body may be made of a rust-resistant metal material or the like. For example, by using a jig body made of aluminum, the jig body can be moderately strong and lightweight.

One split main body 10 forming the jig main body 30 is provided with an injection hole 13 that communicates with the half-split through hole 11 forming the through hole 31 and into which grout is injected.

Further, split body 10 is provided with slit 12 that communicates with injection hole 13 and extends along through hole 31 between a position intersecting injection hole 13 and first end surface 32 . The slit 12 in the illustrated example is in the form of a concave strip that protrudes to the side of the through hole 31 as a whole. It may be in the form of

With the above configuration, the configuration of the longitudinal section perpendicular to the axial direction of the jig body 30 changes depending on the portion in the axial direction, as shown in FIGS. 2A to 2C.

When the grouting jig 50 is actually used, the two divided main bodies 10 and 20 are brought into contact with each other while forming the through hole 31 so as to sandwich the reinforcing bar inserted through the sheath tube of the PCa member, and the end face of the PCa member is formed. 1, a grouting jig 50 is formed by fastening, for example, a plurality of fastening bands 40 (two in the example shown) around the two split main bodies 10 and 20 as shown in FIG. At this time, the injection hole 13 into which the grout is injected may be arranged so as to face upward, or may be arranged so as to face downward or sideways. is set.

By applying the grout injection jig 50, the grout injected into the injection hole 13 can be guided to the sheath pipe of the PCa member through the slit 12, so that the sheath pipe can be efficiently and reliably filled with grout. it becomes possible to

[Grout injection jig according to the second embodiment]
Next, an example of a grouting jig according to the second embodiment will be described with reference to FIG. Here, FIG. 3 is a perspective view of an example of the grouting jig according to the second embodiment.

The grouting jig 50A is different from the grouting jig 50 shown in FIG.

The spacer 35 is, for example, molded integrally with the divided main body 20 , but may be in a form in which a separately molded spacer is adhered to the first end surface 32 .

According to the grouting jig 50A, the first end surface 32 of the jig main body 30 is provided with the spacer 35 that extends into the sheath tube and supports the reinforcing bar. In addition, the spacer 35 automatically lifts the reinforcing bar that has already been inserted through the sheath tube so that the reinforcing bar can be aligned with, for example, the central position of the sheath tube. This allows both efficient placement of the spacer 35 and even and dense filling of the grout between the rebar and the inner surface of the sheath tube.

[Method for connecting PCa members according to the embodiment]
Next, an example of a method for connecting the PCa member according to the embodiment will be described with reference to FIGS. 4 to 8. FIG. Here, FIGS. 4 to 8 are step diagrams of an example of the method for connecting the PCa members according to the embodiment. In the following description, the connection method using the grouting jig 50A shown in FIG. 3 will be described. I will refer to the content of the method that differs from the case of use from time to time.

In the following description, a connection method between a PCa joint, which is a first PCa member 60 made of precast concrete, and two PCa beams, which are second PCa members 70 made of precast concrete, on the left and right thereof will be described.

At the construction site, the PCa column 68 is erected and the PCa joint 60 is installed on the upper end of the PCa column 68 . Here, although illustration is omitted, a plurality of mechanical joints are embedded, for example, below the PCa joint 60, and the column main reinforcement projecting upward from the upper end surface of the PCa column 68 is below the PCa joint. It is mated to some mechanical joint. A horizontal joint (not shown) is formed by injecting grout between the PCa column 68 and the PCa joint 60, and this grout enters the mechanical joint to connect the column main reinforcement and the mechanical joint. be done. Although not shown, the PCa joint 60 is provided with a plurality of joint main bars protruding upward from its upper end surface, and mechanical joints below the PCa columns on the upper floor (not shown) The connection main rebar is fitted into the joint.

In the method of connecting the PCa members, first, the necessary number of grouting jigs 50A shown in FIG. 3 are prepared (step A2).

Here, when using a grouting jig whose jig body is an integrally molded member, similarly, the necessary number of grouting jigs 50 are prepared (step A1).

Next, as shown in FIG. 4 , a first reinforcing bar 65 is inserted through each of a plurality of sheath tubes 63 (two upper and lower in the illustrated example) provided in the PCa joint 60 .

Here, in the illustrated example, the left end face of the PCa joint 60 is the third end face 61 and the right end face is the fourth end face 62 . The sheath tube 63 extends horizontally between a third end surface 61 and a fourth end surface 62, and a third end opening 63a and a fourth end opening 63b are provided at positions facing the respective end surfaces of the sheath tube 63. is provided. The first reinforcing bar 65 is temporarily installed in each sheath tube 63 in a state of protruding from both the third end face opening 63a and the fourth end face opening 63b.

Next, as shown in FIG. 5, at the positions of the upper and lower third end surface openings 63a, the two divided main bodies 10 and 20 are arranged while forming the through holes 31 so as to sandwich the first reinforcing bars 65, 50 A of grouting jigs are formed and installed by fastening the circumference|surroundings of the two division|segmentation main bodies 10 and 20 with the fastening band 40. FIG.

When installing the grouting jig 50A, the spacer 35 projecting from the first end face 32 is inserted downward inside the sheath tube 63 in the Y1 direction.

By inserting the spacer 35 into the sheath tube 63 , the first reinforcing bar 65 inserted through the sheath tube 63 is lifted upward in the Y2 direction, and the first reinforcing bar 65 supported by the spacer 35 moves from the sheath tube 63 . Aligned to the center of the cross section. When using the grouting jig 50 shown in FIG. 1, prior to installing the grouting jig 50, after installing a spacer inside the sheath pipe 63 to support the first reinforcing bar 65, A grouting jig 50 is installed.

After installing the grouting jig 50A, the lock nut 55 is fitted to the first reinforcing bar 65, and the second end surface 33 of the grouting jig 50A is pressed by the locknut 55, thereby disabling the movement of the grouting jig 50A. (above, B2 step).

Here, when using a grouting jig whose jig body is an integrally molded member, the grouting jig 50 is inserted into the PCa joint 60 at the end of the first reinforcing bar 65 while inserting the end of the first reinforcing bar 65 into the through hole 31 . The grouting jig 50 is installed by moving it to the third end surface 61 and then fitting the lock nut 55 (step B1).

After installing the grouting jig 50A, as shown in FIG. 5, the through holes 31 are formed so that the first reinforcing bars 65 are sandwiched between the two divided main bodies 10 and 20 at the positions of the upper and lower fourth end face openings 63b. The grouting jig 50A is formed and installed by arranging while forming and fastening the circumferences of the two divided main bodies 10 and 20 with the fastening band 40 .

Here, the grout injection jig 50A installed at the position of the fourth end surface opening 63b (on the right side of the PCa joint 60 in FIG. 5) is used as a jig for injecting grout. Used as a jig to confirm filling. Therefore, in the grout injection jig 50A installed on the right side of FIG. 5, the injection hole 13 functions as a grout discharge hole (discharge hole).

The right grouting jig 50A is also installed while inserting the spacer 35 protruding from the first end surface 32 downward inside the sheath tube 63 in the Y3 direction.

By inserting the spacer 35 into the sheath tube 63 , the first reinforcing bar 65 inserted through the sheath tube 63 is lifted upward in the Y4 direction, and the first reinforcing bar 65 supported by the spacer 35 is pulled out of the sheath tube 63 . Aligned to the center of the cross section.

In this manner, the spacers 35 at the left and right ends inside the sheath tube 63 align the first reinforcing bars 65 in a horizontal position with the cross-sectional center of the sheath tube 63 inside the sheath tube 63 .

After installing the right grouting jig 50A, the locknut 55 is fitted to the first reinforcing bar 65, and the second end surface 33 of the grouting jig 50A is pressed by the locknut 55, whereby the right grouting jig is installed. 50A is immovably installed (above, step C2).

Here, although illustration is omitted, a backer material having slits may be installed in place of the right grout injection jig 50A used for checking grout filling.

When using a grouting jig whose jig body is an integrally formed member for checking grout filling, the grouting jig 50 is inserted into the PCa finish while inserting the end of the first reinforcing bar 65 into the through hole 31. It is moved to the third end surface 61 of the port 60 and installed, and then the lock nut 55 is fitted to install the grout injection jig 50 (step C1).

After installing the grout injection jigs 50A for grout injection and grout discharge on the third end surface 61 and the fourth end surface 62 of the PCa joint 60, the left and right ends of the first reinforcing bar 65 and the left and right PCa beams 70 are installed. The first reinforcing bar 65 and the second reinforcing bar 75 are connected via the mechanical joint 72 by screwing the ends of the second reinforcing bar 75 protruding from the end of the second reinforcing bar 75 into a mechanical joint 72 such as a coupler. .

Next, as shown in FIG. 6, grout is injected in the Y5 direction from the injection hole 13 of the right grout injection jig 50A. The grout injected into the injection hole 13 is supplied to the inside of the sheath tube 63 through the slit 12 communicating with the injection hole 13 .

Inside the sheath tube 63 , the spacer 35 aligns the first reinforcing bar 65 with the center of the cross section of the sheath tube 63 . A gap is formed along the longitudinal direction of the sheath tube 63 . The grout supplied to the sheath tube 63 flows through this annular gap in the Y6 direction, enters the slit 12 of the right grout injection jig 50A, and flows from the slit 12 into the injection hole 13. The grout flows outside in the Y7 direction. It is expelled (discharged).

A worker can determine that the inside of the sheath pipe 63 is densely filled with grout by confirming the discharge of the grout.

After filling the sheath pipe 63 with grout, grout, epoxy resin, or the like is also injected into the interior of the mechanical joint 72 connecting the first reinforcing bar 65 and the second reinforcing bar 75 . For example, when injecting grout into the mechanical joint 72, the grout can be injected directly through the end opening of the mechanical joint 72 without using the grouting jig 50A.

As shown in FIG. 7, the inside of the sheath tube 63 is densely filled with grout G, and the left and right mechanical joints 72 are also filled with grout or epoxy resin. , the pre-placement state of concrete is formed (above, D process).

Here, when using a grouting jig whose jig body is an integrally molded member, after injecting grout into the sheath pipe 63, the grouting jig 50 is pulled out from the end of the first reinforcing bar 65 and removed, Next, the end of the first reinforcing bar 65 and the end of the second reinforcing bar 75 of the PCa beam 70 are screwed into the mechanical joint 72, and the inside of the mechanical joint 72 is filled with grout, epoxy resin, or the like. That is, by using the grouting jig 50A having the divided main bodies 10 and 20, it is possible to vary the timing of removal of the grouting jig 50A, and the grouting to the sheath pipe 63 and the mechanical joint 72 can be performed. Construction efficiency is improved, such as enabling continuous filling.

Next, as shown in FIG. 8, in the space between the PCa joint 60 and the left and right PCa beams 70, a part of the first reinforcing bar 65, a mechanical joint 72 and a part of the second reinforcing bar 75 are buried. Then, concrete is placed and, for example, a concrete connector 80 having the same cross-sectional shape and the same cross-sectional dimensions as the PCa beam 70 is constructed, thereby connecting the PCa joint 60 and the PCa beam 70 via the concrete connector 80, A beam-to-column joint 100 is constructed.

According to the connecting method of the PCa members shown in the figure, by using the grout injection jigs 50 and 50A when injecting the grout into the sheath tube 63, the grout G is applied to all spaces to be filled with the grout G. can be efficiently and reliably filled, and an efficient method for connecting PCa members can be realized.

Other embodiments may be possible in which other components are combined with the above-described configurations, etc., and the present invention is not limited to the configurations shown here. Regarding this point, it is possible to change without departing from the gist of the present invention, and it can be determined appropriately according to the application form.

10, 20: split main body 11, 21: half-split through hole 12: slit 13: injection hole 30: jig main body 31: through hole 32: first end surface 33: second end surface 35: spacer 40: fastening band 50, 50A : Grout injection jig 55: Lock nut 60: First PCa member (PCa joint, PCa member)
61: Third end face (end face)
62: Fourth end face (end face)
63: Sheath tube 63a: Third end face opening (end face opening)
63b: Fourth end face opening (end face opening)
65: 1st reinforcing bar (reinforcing bar)
68: PCa column 70: Second PCa member (PCa beam, PCa member)
72: Mechanical joint 75: Second reinforcing bar (reinforcing bar)
80: Concrete connector 100: Column beam joint G: Grout

Claims (8)

It is applied when a reinforcing bar is inserted through a sheath pipe provided in a PCa member made of precast concrete and aligned with an end face opening of the sheath pipe facing the end face of the PCa member to inject grout into the sheath pipe. , a grouting fixture,
The grouting jig has a jig body having a first end face that contacts the end face opening and a second end face that is opposite to the first end face,
The jig body is
a through hole extending between the first end face and the second end face and through which the reinforcing bar is passed;
an injection hole that communicates with the through hole and into which the grout is injected;
A grouting jig, comprising a slit that communicates with the casting hole and extends along the through hole between a position intersecting the casting hole and the first end face. The jig body includes a plurality of split bodies that split the through hole,
2. The grouting jig according to claim 1, wherein a plurality of said divided bodies are arranged so as to form said through-holes, and the periphery of said plurality of divided bodies is fastened with a fastening band. . The first end surface of the jig body is provided with a spacer that extends into the sheath tube, supports the reinforcing bar from below, and aligns the reinforcing bar inside the sheath tube. Grouting tool according to claim 1 or 2, characterized in that. The grouting jig according to any one of claims 1 to 3, wherein at least the jig body is made of hard resin. A grouting jig having a jig body with a first end face and a second end face opposite to the first end face,
The jig body is
a through hole extending between the first end face and the second end face and through which a reinforcing bar is passed;
an injection hole that communicates with the through hole and into which grout is injected;
A1 step of preparing a grouting jig that communicates with the casting hole and has a slit that extends along the through hole between a position intersecting the casting hole and the first end surface;
A first reinforcing bar is passed through a sheath pipe provided in a first PCa member made of precast concrete, and a third end surface opening facing the sheath pipe on the third end surface of the first PCa member, and a fourth end surface of the first PCa member. from both of the fourth end face openings facing the sheath pipe, the first reinforcing bar is protruded, the first reinforcing bar is inserted into the through hole, the grouting jig is temporarily installed, and the second PCa member is provided A B1 step of connecting one end of the second reinforcing bar and one end of the first reinforcing bar via a mechanical joint and permanently installing the grouting jig at the position of the third end face opening;
While the first reinforcing bar overhanging from the fourth end face opening is penetrated through the through hole provided in the backer material or through the through hole of the separate grouting jig, the backer material or the separate C1 step of actually installing the grouting jig at the position of the fourth end face opening;
Grout is injected from the injection hole of one of the grout injection jigs, and the grout that has flowed through the slit and the sheath tube is injected into the slit of the backer material or the injection of the other grout injection jig. A D step of confirming that the grout has been discharged from the hole and completing the grout injection;
Concrete is placed between the first PCa member and the second PCa member so as to embed a portion of the first reinforcing bar, the mechanical joint, and a portion of the second reinforcing bar, and the first PCa member and A method for connecting PCa members, characterized by comprising an E step of connecting the second PCa member. A grouting jig having a jig body with a first end face and a second end face opposite to the first end face,
The jig body is
a through hole extending between the first end face and the second end face and through which a reinforcing bar is passed;
an injection hole that communicates with the through hole and into which grout is injected;
a slit communicating with the injection hole and extending along the through hole between a position intersecting the injection hole and the first end surface;
A2 step of preparing a grouting jig in which the jig body is formed of a plurality of divided bodies dividing the through hole;
A first reinforcing bar is passed through a sheath pipe provided in a first PCa member made of precast concrete, and a third end surface opening facing the sheath pipe on the third end surface of the first PCa member, and a fourth end surface of the first PCa member. The first reinforcing bar extends from both of the fourth end face openings facing the sheath tube, and one end of the second reinforcing bar provided in the second PCa member and one end of the first reinforcing bar are connected via a mechanical joint, At the position of the third end face opening, disposing the plurality of divided bodies while forming the through holes so as to sandwich the first reinforcing bar, and fastening the circumference of the plurality of divided bodies with a fastening band A B2 step of forming and installing the grouting jig;
While the first reinforcing bar overhanging from the fourth end face opening is penetrated through the through hole provided in the backer material or through the through hole of the separate grouting jig, the backer material or the separate C2 step of actually installing the grouting jig at the position of the fourth end face opening;
Grout is injected from the injection hole of one of the grout injection jigs, and the grout that has flowed through the slit and the sheath tube is injected into the slit of the backer material or the injection of the other grout injection jig. A D step of confirming that the grout has been discharged from the hole and completing the grout injection;
Concrete is placed between the first PCa member and the second PCa member so as to embed a portion of the first reinforcing bar, the mechanical joint, and a portion of the second reinforcing bar, and the first PCa member and A method for connecting PCa members, characterized by comprising an E step of connecting the second PCa member. In the B1 step or the B2 step, spacers are installed at least near the third end face opening and near the fourth end face opening in the lower part of the inside of the sheath tube,
7. The method of connecting PCa members according to claim 5, wherein the first reinforcing bar is supported from below by at least two spacers, and the first reinforcing bar is aligned inside the sheath tube. . In the A1 step or the A2 step, a spacer is provided on the first end face to extend into the sheath tube to support the reinforcing bar from below and align the reinforcing bar inside the sheath tube. , preparing the jig body,
In the B1 step, the B2 step, the C1 step, and the C2 step, when the two grouting jigs are actually installed at the positions of the third end face opening and the fourth end face opening, respectively, the spacer is 7. The method of connecting PCa members according to claim 5, wherein the first reinforcing bar is inserted into the sheath tube to support the first reinforcing bar from below.

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