JP2001123526A - Working method for joint of precast concrete beam and column, and construction method for beam and column frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To definitely prevent leakage into a sheath of joint mortar when jointing a beam to a column by using a joint sheath constituted of an inner cylinder, an outer cylinder and a spring. SOLUTION: Thin-filmed breakable sheets 14, 15 shielding the openings are adhered to respective contact surfaces of an inner cylinder 12 and a column 50 and, after the erection of a beam 60, the inner cylinder 12 is projected out and brought into contact with a column 50, and joint mortar 16 is applied between the column and beam. Even though the joint mortar enters between thin films, it does not leak into the sheath. The thin film is broken when a PC tensioning member is inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing joints between precast concrete beams and columns and a method for constructing a beam-column frame using the same.

[0002]

2. Description of the Related Art When constructing a building structure, there is a construction technique in which a column member made of cast-in-place or precast concrete and a beam member made of precast concrete are press-bonded to each other by using a PC tendon material and joined. In this case, in order to integrally join the beam erected between the columns with the column, 20-
A joint joint of about 40 mm is provided to fill a non-shrink mortar or the like. PC for crimping on columns and beams
A tendon insertion hole penetrates, and the insertion hole is opposed to this joint, and the sheath tube (joint sheath) communicates with the opposed insertion hole so that the mortar does not leak into the insertion hole when filling the joint mortar. ).

The applicant of the present application has proposed a construction method and a sheath suitable for such a narrow joint in Japanese Patent Publication No. Hei 8-10721 and has been well received. This technology accommodates in a beam a joint sheath consisting of an expanded outer cylinder, an inner cylinder fitted inside the outer cylinder, and a spring housed in the inner part of the outer cylinder and biasing the inner cylinder to protrude. Keep the inner cylinder flush with the end face of the outer cylinder until the beam is erected, release the lock on the inner cylinder after the beam is erected between the pillars, and release the inner cylinder by the biasing force of the spring. After projecting, it is brought into contact with the opening surface of the insertion hole provided in the pillar, and the PC tendon material insertion hole is communicated. Then, the PC tendon material is inserted between the pillar, beam and pillar, and the joint mortar is filled and the mortar is hardened. This is a method in which the columns and beams are integrated by tensioning the PC tension member.

FIG. 7 shows an example of a joint 51 between a column 50 and a beam 60. FIG. 7 shows a view in which a beam 60 is pressure-bonded to a pillar 50 erected on a foundation 70 via joint mortar 52. The PC tension member 53 penetrates between the columns and beams and is fixed at the column outer end surface 54 by a fixing device 55. A joint sheath 61 is used at the beam-column joint. FIG. 8 is a detailed view of the joint sheath 61 shown in FIG. 7. The outer cylinder 62 accommodated in the beam 60 and the inner cylinder 64 fitted inside the outer cylinder 62 and urged by the spring 63 are formed by the open end face 56 of the column 50. Is in contact with A ring-shaped packing 57 is provided on the open end face 56 of the column 50.
Is attached, and the opening end face 65 of the inner cylinder 64 is sealed with a packing 57 so that the joint mortar 52 does not leak into the inner cylinder 64.
To be crimped.

[0005] However, this joint sheath is also used when the urging force of the spring 63 does not act properly or when the inner cylinder 64
Of the joint mortar 5 into the tendon insertion hole 66 may be uncertain.
There was a problem in the certainty of preventing the leakage of No. 2. Therefore, in order to avoid a situation in which the insertion of the PC tendon material cannot be performed due to the mortar leakage, it is necessary to perform the work of inserting the PC tendon material before filling the joint mortar 52. This is the critical path (the process that controls the shortest required time in the entire process)
Thus, the shortening of the process was hindered, and the entire process was affected.

[0006]

SUMMARY OF THE INVENTION The present invention improves the weakness of the joint sheath, improves the certainty of preventing mortar from leaking, and eliminates the critical path in the work process.
By making the entire process flexible, we aim to improve quality, workability, and economic efficiency.

[0007]

SUMMARY OF THE INVENTION The present invention has been developed to solve the above-mentioned problems. The technical means of the present invention is a double cylinder comprising an inner cylinder and an outer cylinder which can be inserted into and removed from each other, and the outer cylinder. In joining the column and beam using a joint sheath composed of a spring seated inside and biasing the inner cylinder in a direction to push the inner cylinder out of the outer cylinder, an opening is formed in the contact surface of each of the inner cylinder and the column. Adhere a thin film fragile sheet that shields each,
A method for constructing a joint between a precast concrete beam and a column, comprising projecting the inner cylinder after the installation of the beam, bringing the inner cylinder into contact with the column, and constructing a joint mortar between the column and the beam. Since a thin film sheet is attached to the opening of the column and the inner cylinder and the openings are brought into contact with each other, the joint mortar does not destroy the thin film even if it enters between the thin films, as in the case of the conventional sealing failure. The joint mortar does not leak into the sheath. Therefore, it is not necessary to insert a PC tendon into the sheath before the joint mortar is applied.
The PC tendon can be easily inserted by pushing the thin film with the C tendon.

According to a second aspect of the present invention, there is provided a step of erecting a plurality of columns by using the above-described joint construction method, a step of erection of a beam between the columns, and a step of joining a joint mortar at a joint surface between the column and the beam. A beam-column structure, comprising: a step of filling, a step of inserting a PC tendon in order from a column in which the joint mortar has been hardened, and a step of prestressing the PC tendon between columns. Is the construction method.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a joint of a beam and a column according to an embodiment of the present invention. FIG. 1 is a detailed view of a joint sheath 10 buried in a beam 60 facing a column 50 of the embodiment. The joint sheath 10 includes an inner cylinder 12 and an outer cylinder 11 which can be inserted and removed. FIG. 3 is a view urged by a spring 13 provided inside the outer cylinder 11 and brought into contact with the opening surface of the column insertion hole. Column opening surface and inner cylinder 12
The fragile thin film shielding sheet 1
Joint mortar 16 on which 5, 14 are attached and filled
The opening is shielded so as not to leak into the insertion hole. If the urging force of the spring 13 is not sufficient and the filling joint mortar 16 leaks between the shielding sheets 14 and 15, the space between the shielding sheets 14 and 15 is narrow, and the leaked mortar is inserted into the PC after hardening. It is easily crushed by the tip of the material and does not close the tendon insertion hole. As the shielding sheets 14 and 15 used here, a synthetic resin film such as water-resistant vinyl or polyethylene is preferably used.

FIG. 2 is a perspective view of the joint sheath.
The outer cylinder 11, the inner cylinder 12, and the film body of the shielding sheet 14 adhered to the contact surface at the tip of the inner cylinder are illustrated.

FIG. 3 is a process diagram of a method of constructing a beam-column frame according to the present invention. FIG. 3A shows a process of erecting a column 50 having a bracket 58 or a jaw for temporarily locking a beam on a foundation 70. .

FIG. 2B shows a step of erection of the beam 60 between the columns 50.

(C) is a step of filling joint mortar 16 into the joint between the erected beam 60 and column 50. Prior to filling the joint mortar 16 as described above, the shielding sheet is attached to the opening surface of the pillar. Further, a shielding sheet is attached to the tip of the joint sheath inner cylinder of the beam. The inner cylinder is in close contact with the column contact surface by being urged by a spring. Since the filling of the joint mortar 16 can be performed immediately after the erection of the beam 60, it is not necessary to construct the joint mortar after the completion of the erection over a plurality of spans. That is, in order to prevent the trouble caused by the conventional joint mortar leakage, the joint mortar cannot be performed until the insertion of the PC tendon material.

FIG. 4 is a process drawing of the method of constructing the column-beam frame following FIG.

(D) is a step of inserting the PC tendon 53, which is inserted from the side of the column 50 where the joint mortar has hardened. At this time, the shielding sheet at the joint surface between the pillar 50 and the beam 60 is torn at the tip of the inserted PC tendon 53.

(E) When the insertion of the PC tendon material 53 to the predetermined length is completed, prestress is introduced and the fixing is performed by the fixing tool 55, and the column 50 and the beam 60 are pressed against each other to complete the frame.

FIG. 5 and FIG. 6 are explanatory diagrams of the state transition of the joint sheath during the above-mentioned steps. FIG. 5A shows a state before the inner cylinder 12 immediately after erection of the beam and before it is locked by the outer cylinder 11 and protrudes. FIG. 5B shows that the lock of the inner cylinder 12 is released,
The inner cylinder 12 is urged by the spring 13 to protrude to the opposing surface to close the respective insertion holes. FIG.
FIG. 6C is a process subsequent to FIG. 5, and FIG. 6C shows a state in which the joint mortar 16 is filled in the state of FIG. 5B.

FIG. 6D shows that after the joint mortar 16 has hardened,
The PC tendon 53 is inserted into the insertion hole, and the respective shielding sheets are broken by the tendon. Even if the joint mortar 16 leaks between the shielding sheets 14 and 15, the joint mortar 16 is crushed by the PC tendon 53 and becomes a fine powder and does not close the insertion hole.

[0019]

According to the present invention, there is provided a double cylinder comprising an inner cylinder and an outer cylinder which can be inserted into and removed from each other, and a direction in which the inner cylinder is seated in the outer cylinder and pushed out from the outer cylinder. The joint sheath composed of the biasing spring and the joint sheath is improved by attaching a thin fragile sheet that shields the opening of the contact surface of each of the inner cylinder and the column. It became possible to fill the joint mortar at the joints between the columns and beams immediately after the beams were erected between the columns. Then, it became possible to insert the PC tendon in order from the column where the hardening of the joint mortar was completed, and to apply the prestressing to the PC tendon between the predetermined columns. This eliminates the critical path that necessitates the insertion step of the PC tendon prior to the filling of the mortar in order to avoid the difficulty in inserting the tendon due to the leakage of the joint mortar. Was. Also, conventionally, even if filling the mortar after inserting the tendon material, if it is not possible to completely eliminate leakage into the insertion hole, it is necessary to remove the leaked mortar,
The trouble and the like can be eliminated, and the effect of contributing to quality, workability, improvement of the degree of freedom of the entire process, economy, and the like is great.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a joint sheath of an embodiment.

FIG. 2 is a perspective view of a joint sheath.

FIG. 3 is a construction process diagram of a beam-column frame.

FIG. 4 is a construction process diagram of a column-beam frame.

FIG. 5 is an explanatory diagram of a state transition of a joint sheath.

FIG. 6 is an explanatory diagram of a state transition of a joint sheath.

FIG. 7 is an explanatory diagram showing an example of a beam-column joint.

FIG. 8 is a detailed view of the joint sheath of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Joint sheath 11 Outer cylinder 12 Inner cylinder 13 Spring 14 Blocking sheet 15 Blocking sheet 16 Joint mortar 50 Column 51 Joint 52 Joint mortar 53 PC tension member 54 Outer end face 55 Fixing tool 56 Opening end face 57 Packing 58 Bracket 60 Beam 61 Joint Sheath 62 Outer cylinder 63 Spring 64 Inner cylinder 65 Open end face 66 Tensioner insertion hole 70 Foundation

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[Procedure amendment]

[Submission Date] November 26, 1999 (1999.11.
26)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a joint of a beam and a column according to an embodiment of the present invention. Figure 1 is a detailed view of the joint sheath 10 which is instrumentation embedded in the beam 60 facing the posts 50 of the embodiment, the joint sheath 10 is composed of a removably inner-tube 12 and the outer cylinder 11, inner cylinder Reference numeral 12 is a view urged by a spring 13 provided inside the outer cylinder 11 and abutting on the opening surface of the column insertion hole. Column opening surface and inner cylinder 12
The fragile thin film shielding sheet 1
Joint mortar 16 on which 5, 14 are attached and filled
The opening is shielded so as not to leak into the insertion hole. If the urging force of the spring 13 is not sufficient and the filling joint mortar 16 leaks between the shielding sheets 14 and 15, the space between the shielding sheets 14 and 15 is narrow, and the leaked mortar is inserted into the PC after hardening. It is easily crushed by the tip of the material and does not close the tendon insertion hole. As the shielding sheets 14 and 15 used here, a synthetic resin film such as water-resistant vinyl or polyethylene is preferably used.

Claims (2)

[Claims] 1. A joint comprising a double cylinder comprising an inner cylinder and an outer cylinder which can be inserted into and removed from each other, and a spring which is seated in the outer cylinder and biases the inner cylinder in a direction to push the inner cylinder out of the outer cylinder. In joining the column and beam using the sheath, a fragile sheet of a thin film that shields an opening is adhered to the contact surface of each of the inner cylinder and the column, and after the beam is erected, the inner cylinder is A method for constructing joints between precast concrete beams and columns, characterized by projecting the inner cylinder into contact with the columns and projecting joint mortar between the columns and beams. 2. A step of erection of a plurality of columns by using the joint construction method according to claim 1, a step of erection of a beam between the columns, and a step of filling joint mortar on a joint surface between the column and the beam. A step of inserting a PC tendon in order from the column in which the joint mortar has been hardened, and a step of prestressing the PC tendon between the columns. .