JP6279962B2 - Precast concrete member joining method and precast concrete member - Google Patents

Description

  The present invention relates to a method for joining PCa members (precast concrete members) in building work and a PCa member (precast concrete member) used therein.

  The reinforcing bar joint has two reinforcing bar fixing means facing each other, and a pair of reinforcing bars are butt-joined by fixing the ends of the pair of reinforcing bars to be bonded to the reinforcing bar fixing means.

  There are various fixing means, and one of them is a sleeve mortar type fixing means. This is a fixing means of a type in which the end of a reinforcing bar is inserted into a cylindrical body called a sleeve and the reinforcing bar is fixed in the sleeve by hardening of the grout (a mortar having a large fluidity) filled in the sleeve.

In the joining of PCa members (precast concrete members), a reinforcing bar joint joining method using a sleeve joint is also disclosed in the following Patent Document 1, but generally the second PCa member to be connected to the first PCa member. A cylindrical sleeve is embedded at the end, and both PCa members are opposed to each other while the reinforcing bars of both PCa members are abutted in the sleeve, and then the filler is filled in the sleeve.
Japanese Patent Laid-Open No. 10-147978

  In such a conventional method of embedding a normal sleeve joint in one PCa member and inserting a main bar protruding from the other PCa member, the PCa member is lowered from the upper side to the lower side in the column member. However, the beam member has a problem that it must be performed while moving the PCa member in the lateral direction.

  Further, FIG. 3 is an explanatory diagram of the site, where α is a column, β is a beam, and γ is a panel zone. In addition to the above, (i) In order to enable lateral movement on the stigma, the pillar PCa must be a “reverse insertion method”.

  Further, (ii) in the case of the PCa member in which the panel zone γ and the column α are integrated, it is unavoidable that the panel zone γ is provided with a lateral hole through which the beam main bar passes.

  (I) (ii) In both cases, it is difficult to attach the PCa member, and joints and mortar grout in the column beam main reinforcement through hole.

In addition, the following patent document is proposed as what joins PCa beam members, without moving horizontally.
JP 2008-69591 A

  This patent document 2 includes a method of moving a sleeve joint and a method of moving a connecting reinforcing bar in a method of joining precast reinforced concrete beam members. The former is a method of moving the sleeve joint disposed on one beam member to the other. The sleeve joint is moved across the beam bars and connected across both beam bars.

  In the latter case, one beam member is embedded with a sheath tube that can be equipped with a connecting rebar, and the ends of the precast reinforced concrete beam members are made to face each other, and the connecting rebar in the sheath tube is put in contact with the other beam. Insert and straddle into the sleeve joint embedded in the end of the member.

  The sleeve joint of Patent Document 2 can be moved toward the other beam line only by the panel zone γ of FIG. The reason is that it is impossible to insert the sleeve joint into the other beam member and straddle the end portions of the precast reinforced concrete beam members relative to each other and in a butted state.

  Furthermore, the movement between the beam joints of the sleeve joint is performed by pulling the string body fixed in the vicinity of the back end, and it is difficult to move it smoothly, and the operation is troublesome.

  When inserting the connecting rebar into the sleeve joint embedded in the end of the other beam member and straddling it, this is done by hand, inserting the hand from the recess and moving the connecting rebar toward the sleeve joint. It is necessary to slide and the work is troublesome.

  The object of the present invention is to eliminate the inconvenience of the conventional example, and in the joining method of the precast concrete member using the sleeve joint, it is possible to move the hiring bar (connection reinforcing bar) with one touch without troublesome operation. Therefore, there is no restriction on the suspension of the PCa member, and for example, it is an object to provide a precast concrete member joining method and a precast concrete member in which the beam PCa member can be suspended in the vertical direction.

In order to achieve the above object, the present invention relates to a precast concrete member joining method using a sleeve joint as a joining method of a precast concrete member. In one precast concrete member, an employment bar (reinforcing bar) and an employment bar ( A special sleeve with a built-in push-out mechanism for the connecting rebar) is installed, and the opening of the special sleeve is a hook as a stopper to lock the hiring bar (connecting rebar) in the opening of the special sleeve. It is provided so as to extend over a plurality of members, and when the precast concrete member is joined, the locking is released, and the hiring bar is pushed out and inserted by the push-out mechanism toward the sleeve of the counterpart precast concrete member.

In addition, the precast concrete member is a precast concrete member that is used for jointing reinforcing bars using sleeve joints, and has a built-in push-out mechanism for hiring bars (reinforcing bars) and hiring bars (reinforcing bars). A sleeve is installed, and the special sleeve joint opening is a scissors as a stopper for locking the hiring bar (reinforcing bar) to the special sleeve opening, and spans multiple special sleeve openings side by side The gist is that a stopper is provided.

According to the present invention, the sleeve installed in one precast concrete member is a special sleeve (sleeve longer than usual) having a hiring bar (connecting rebar) and a hiring bar push-in mechanism built in, and the extruding mechanism. Can automatically push out hiring sources.

  Thereby, in a state where the precast concrete members are in contact with each other, the hiring bars (reinforcing bars) can be passed over the sleeves of the two precast concrete members, and the joining is completed by mortar grouting the sleeve and the joint.

  Further, by providing a stopper for locking the hiring bar (connecting reinforcing bar) in the special sleeve opening, the timing of pushing out the hiring bar can be ensured by the stopper.

Moreover, by using the stopper of the hiring bar lock as a hook, it is possible to carry out the locking and releasing of the hiring bars at once by inserting / removing the hook through the plurality of side-by-side special sleeve joint openings.

  As described above, the precast concrete member joining method and the precast concrete member according to the present invention can move the hiring bar (reinforcing bar) with a single touch without troublesome operations. For example, the beam PCa member can be suspended in the vertical direction.

  Also, the column PCa member is not suspended by a crane. For example, when the column PCa member is moved horizontally to a predetermined column position by a carriage traveling on the upper end of the beam, the column PCa member is lifted at one end to protrude from the lower floor. Does not need to be inserted into the main column joint embedded in the column base, and the lifting function is not required for the traveling carriage.

  Further, the panel zone PCa can be moved laterally on the stigma and the panel zone vertical through hole is eliminated without using the “reverse insertion method” or the “panel zone vertical penetration hiring method” in the panel zone PCa (the lotus root). Therefore, the mortar grout operation is simplified.

  Note that the necessity of laterally moving the panel zone PCa member on the stigma is eliminated when the present invention is applied to the beam PCa member.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal side view showing an embodiment of a precast concrete member joining method and a precast concrete member according to the present invention. In the figure, reference numerals 1 and 2 denote PCa members (precast concrete members), which utilize sleeve joints. In order to perform the joining, sleeves 3 and 4 for joints were embedded, and the opening 5 was exposed on the end face of the PCa member. The PCa members 1 and 2 may be beam PCa members or column PCa members.

  The sleeve 4 is a normal sleeve, and the sleeve 3 is a special sleeve having a length longer than that of a normal sleeve (referred to as special in terms of length). The special sleeve 3 has a hiring bar (connecting rebar) 6 and a hiring. A push-out mechanism 7 for the bars (reinforcing bars) 6 was incorporated.

  The special sleeve 3 and the sleeve 4 are placed on the reinforcing bars 8 of the PCa members 1 and 2, and a plurality of annular projections 13 are provided on the inner wall surfaces for strengthening the engagement with the hardened grout.

  In this embodiment, the push-out mechanism 7 is a coil spring spring, and uses an extension spring that urges the hiring bar 6 to push it toward the sleeve opening 5, and the reinforcing bar 8 and the hiring bar 6 to which the special sleeve 3 for fitting is fitted. Between. The pushing mechanism 7 compresses a coil spring spring extending to a required length and installs it at the rear part of the hiring bar 6.

  As another embodiment, the push-out mechanism 7 may be another spring such as a leaf spring, or a member that is expanded by liquid or gas and is pushed out by its expansion force, or a member that is pushed out by an extension force by an expansion / contraction mechanism such as a cylinder. .

  As shown in the figure, a sleeve mortar type joint (which forms the shape of a single cylinder) in which the two fixing means are all referred to as a mortar-filled rebar joint or sleeve joint. This is the example shown, but in another embodiment, a half-sleeve joint when one is the same system and the other is another fixing means (such as a screwing system), particularly when this is a screwing system is screwed. A sleeve joint may be used.

  An inlet 9 a and an outlet 9 b are provided on the side walls near both openings of the special sleeve 3 and the sleeve 4.

  In the case of a half sleeve joint, an inlet is provided near the opening of the sleeve portion, and an outlet is provided near the boundary with other fixing means.

  A stopper 10 for locking the hiring bar 6 is provided in the opening 5 of the special sleeve 3, and the locking is released when the PCa members 1 and 2 are joined.

  In the present embodiment, the stopper 10 is a rod made of a steel rod such as a reinforcing bar, and is disposed in the groove 11 dug in the joint surface of the PCa member 1 so as not to make a business trip from the joint surface of the PCa member.

  The grooves 11 are provided with hooks 12 at appropriate intervals, avoiding the positions of the openings 5 of the special sleeve 3, and the stoppers 10 become wrinkles when inserted into the hooks 12.

  The openings 5 of the special sleeve 3 are arranged at appropriate intervals in the groove 11, but one stopper 10 spans a plurality of the openings 5 of the side-by-side special sleeves 3.

  Next, usage and operation will be described. In the PCa member 1, the stopper 10 is disposed so as to cross the cross section of the PCa member so as to suppress the end face of the hiring bar 6.

  After installing the opposing PCa members 1 and 2, the hiring bar pushing mechanism 7 is operated by pulling out the stopper 10 from the outside of the PCa member 1. At this time, since the main bars do not protrude from both end faces of the PCa members 1 and 2, the PCa members 1 and 2 can be easily attached.

  Thus, after both PCa members 1 and 2 are installed facing each other across the joint, the hiring bar push-out mechanism 7 is actuated to insert the hiring bar 6 into the normal sleeve 4 facing each other.

  Mortar grout the special sleeve 3, sleeve 4 and joint.

  As described above, “screw sleeve joint” may be used for the special sleeve 3 and the sleeve 4. If the PCa driving main reinforcement is a “screw rebar”, a “screw sleeve joint” can be used, and the overall length of the joint can be shortened.

  Further, if necessary, the diameter and strength of the hiring bar can be changed to the main bar for driving the PCa member.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view of a precast concrete member joining method and a precast concrete member according to an embodiment of the present invention before hiring bar extrusion. It is a vertical side view after hiring bar extrusion which shows one embodiment of a joining method of a precast concrete member of the present invention, and a precast concrete member. It is explanatory drawing which shows arrangement | positioning of the precast concrete member in the spot. It is a front view of the principal part of the precast concrete member of this invention. It is a vertical side view of the principal part of the precast concrete member of this invention. It is a vertical side view of the opening part of the special sleeve of the precast concrete member of this invention. It is a front view of the opening part of the special sleeve of the precast concrete member of this invention.

1, 2 ... PCa member (precast concrete member)
3 ... Special sleeve 4 ... Sleeve 5 ... Opening 6 ... Employment bar (rebar for connection)
DESCRIPTION OF SYMBOLS 7 ... Extrusion mechanism 8 ... Reinforcing bar 9a ... Injection port 9b ... Discharge port 10 ... Stopper 11 ... Groove 12 ... Hook 13 ... Annular projection

Claims (2)

The joining method of the precast concrete member utilizing a sleeve joint, and internally provided special sleeve with a built-in push-out mechanism of one muscle hired to precast concrete member (reinforcing bar for connection) and employment muscles (rebar for connection), Special As a stopper for locking the hiring bar (reinforcing bar) at the opening of the sleeve, it is a hook that spans multiple openings in the side-by-side special sleeves, and the lock is released when joining precast concrete members And a joining method of the precast concrete member, wherein the hiring bar is pushed out and inserted by an extrusion mechanism toward the sleeve of the counterpart precast concrete member. A precast concrete member used for joining reinforcing steel joints using sleeve joints. A special sleeve with a built-in push-out mechanism for hiring bars (reinforcing bars) and hiring bars (reinforcing bars) is installed. In the joint opening, the special sleeve opening is a hook as a stopper to lock the hiring bar (rebar for connection), and it is provided with a stopper that spans multiple openings in the side-by-side special sleeve Precast concrete parts.

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