JPS6121241A - Construction of multi-spun beam in prestressed concrete member assembling type lamen structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a method for constructing a multi-span beam in a prefabricated rigid frame structure using prestressed concrete beams.

[Prior art]

Conventionally, when joining multi-span continuous beams in prestressed concrete member prefabricated rigid frame structures, the construction was complicated because it was necessary to insert and fix tension members such as prestressed steel over the entire length of each beam. In addition, in order to assemble and join multi-span continuous beams from spans at arbitrary positions, short tendons are used only at the joints and are crimped and joined, resulting in low reliability of joint strength and In type rigid frame structures, it has been difficult to assemble and join two-way multi-span continuous beams from arbitrary spans.

[Purpose and structure of the invention]

The present invention aims to provide a method for constructing a multi-span beam in a prestressed concrete member assembled rigid frame structure that can advantageously solve the above-mentioned problems. At the ends of the beams 2 and 3 which are arranged to face each other with the beams 1 in between, haunches 4 and 5 are provided which face each other so as not to overlap each other.
PC inserted through the entire length of the beam through the uncut and punched part of the
The steel material is inserted over the entire length of the beam passing through the non-notched part of one beam, and the end of the column 1 and the other beam facing the notched part, and is made to protrude from the notched part, and then the PC steel material The method of constructing a multi-span beam in a prestressed concrete member assembly type rigid frame structure is characterized in that each beam 2, 3 and a column 1 are connected by tension-fixing.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

9 to 11 show one of the two types of prestressed concrete beams used in the embodiment of the present invention, in which downward opening grooves 6 are provided in the beam 2 except for both ends. .

In addition, both ends of the downward opening groove 6 form an inner groove 4 located at the middle part in the beam width direction of both ends of the beam 2.
A pretensioned tension member 7 made of a PC steel wire extending in the longitudinal direction of the beam is buried on both sides in the width direction at the bottom of the On both sides of the beam, there are provided a lower straight hole 8 that penetrates in the longitudinal direction of the beam, and an upper wire hole 9 that penetrates in the longitudinal direction of the beam and is curved so that the middle part is depressed downward.
In addition, a plurality of lower wiring holes 10 and a plurality of upper wiring holes 11 are provided at the end of the beam 2 at a portion corresponding to the inner haunch 4. At the end of the wire hole 11, a square-type tightening cone 12 is provided to fix the PC steel material.

FIGS. 12 to 14 show another one of the two types of prestressed concrete beams used in the embodiment of this invention, in which both left and right sides of the lower part of the beam 6 excluding both ends are shown. A notch 16 is formed and has a T-shaped cross section, and both ends of the notch 16 are outer haunches 5 located on both sides of the beam width direction, and the width of the lower part of the beam 6 is On both sides of the beam, pretension tension members 7 made of PC steel wire extending in the longitudinal direction of the beam are buried.
Both ends of the tension member 7 are fixed to the ends of the beam 3, and on both sides of the beam 6 in the width direction, there are linear lower wire holes 14 that penetrate in the longitudinal direction of the beam and Additionally, an upper wiring hole 15 is provided which is curved so that the intermediate part is concave downward, and a lower wiring hole 16 and an upper wiring hole 17 are provided at the end of the beam 6 at a portion corresponding to the outer haunch 5. The outer haunch 5 is provided with a schematic tightening cone 12 at the ends of the lower wire passage hole 16 and the upper wire passage hole 17.

Figures 1 to 5 show prefabricated rigid-frame structures constructed using the beams 2 and 3, and Figures 6 to 8 show the arrangement of the beams 2 and 3. 2 and the beam 6 are arranged alternately in series, that is, the end of the beam 2 and the end of the beam 6 are arranged to face each other with the precast concrete column 1 in between, and the end of the beam 2 is Inner haunch 4
and the outer haunch 5 at the end of the beam 3 are opposed to each other so as not to overlap each other, and the lower wiring hole 8 of one beam 2, the lower wiring hole 18 of the column 1 on both sides thereof, and the beam 3 on both sides. A lower PC steel material 19 is inserted across the lower wire passage hole 16 at one end, and the upper wire passage hole 9 of the one beam 2 and the upper wire passage hole 20 of the columns on both sides thereof, and one end of the beam 3 on both sides. The upper PC steel material 21 is inserted across the upper wiring hole 17 of one beam 6, and the lower wiring hole 22 of the column 1 on both sides of the lower wiring hole 14 of one beam 6 and one end of the beam 2 on both sides. Lower PC across the lower wiring hole 10
The steel material 23 is inserted through the upper wire hole 15 of the one beam 3.
An upper PC steel member 25 is inserted through the upper wire passage hole 24 of the pillar 1 on both sides and the upper wire passage hole 11 at one end of the beam 2 on both sides.

A cast-in-place concrete joint material 26 is filled between the end of each beam 2, 3 and the column 1, and after the joint material 26 has hardened, each PC steel material 19, 21.2'3° 25 is tensioned. At the same time, the ends of these PC steel materials are fixed by the model tightening cone 12, and mortar is drouted between the open wire hole and the PC steel materials.

15 and 16 show examples of modified cross-sectional shapes of the intermediate portions of the beams 2 and 3 to be joined. In the case of FIG. 15, a notch is cut at the lower right of the intermediate portion of one beam 2 A notch is formed at the lower left of the intermediate portion of the other beam 6. In the case of FIG. 16, a downward opening groove is formed in the middle part of one of the trapezoidal cross-section beams 2, and cutouts are formed on both left and right sides of the lower part of the other trapezoidal cross-section beam 6, resulting in a T-shaped cross-section. There is.

〔Effect of the invention〕

According to this invention, the haunches 4 and 5 are provided at the ends of the beams 2 and 3, which are arranged to face each other with the pillar 1 in between, so as not to overlap with each other, so that each beam 2.6 has no haunches. A prestressed steel material is inserted through the entire length of the beam through the non-haunch part of one beam and the end opposite to the haunch part of the column 1 and the other beam to protrude from the haunch part. Since each beam 2, 3 and column 1 are connected by tension fixing the PC steel material to
can be used to secure the ends of the prestressed steel beams, making it easy to crimp the beams using the prestressed steel materials for each span in a multi-span prefabricated rigid-frame structure. The assembly order can be freely selected, and a two-way multi-span continuous beam can be constructed freely and easily from any span, and it can be crimped, and the length of the PC steel material for crimping and joining can be adjusted freely. Since the length can be made longer than the span length, effects such as reliable pressure bonding can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional plan view of a C-member assembly type frame constructed by the method of the present invention, and FIG. 2 is taken along line A-A in FIG. 1. 6 is a sectional view taken along the line B-B in FIG. 1, FIG. 4 is an enlarged longitudinal side view showing details of the beam joint to the left column in FIG. 2, and FIG. FIG. 3 is an enlarged vertical cross-sectional side view showing details of the beam joint to the left column. Fig. 6 is a cross-sectional plan view showing the arrangement of an intermediate section T-shaped beam, an intermediate section downward-opening channel beam, and a column, Fig. 7 is a sectional view taken along the line C--C in Fig. 6, and Fig. 8 It is an enlarged sectional view taken along the line DD in the figure. 9th
The figure is a longitudinal sectional side view of a downward opening channel beam in the middle cross section, Fig. 10 is a sectional view taken along the line E-E in Fig. 9, and Fig. 11 is a sectional view taken along the line F-F in Fig. 9.
12 is a longitudinal sectional view of the T-shaped beam in intermediate section, FIG. 16 is a sectional view taken along line G-G in FIG. 12, and FIG.
It is a sectional view taken along line H-H in the figure. FIGS. 15 and 16 are diagrams showing examples of cross-sectional shapes of intermediate portions of beams that are joined facing each other. In the figure, 1 is a column, 2 and 3 are beams, 4 and 5 are corbels, 12 is a wedge-type tightening cone, 19 is a lower PC steel material, 2
1 is upper PC steel material, 23 is lower PC steel material, 25 is upper P
C steel material 26 is cast-in-place concrete joint material. JP-A Showa Gl-21241 (7) 14"l (") - Yen JP-A Showa 6L-21241 (9) Jl-, J Engineering Engineering - HaIOsa

Claims (1)

[Claims] Corbels 4 and 5 are provided at the ends of beams 2 and 3, which are arranged to face each other with the column 1 in between, so as not to overlap each other, and the entire length of the beams is passed through the non-haunch portion of each beam 2 and 3. The prestressed steel material is inserted through the entire length of the beam passing through the non-haunch portion of one beam, and the end of the column 1 and the other beam facing the haunch portion to protrude from the haunch portion, and then the above-mentioned PC
A method for constructing a multi-span beam in a prestressed concrete member assembly type rigid-frame structure, characterized in that each beam 2, 3 and a column 1 are connected by tension-fixing steel members.