JPH05118087A - Precast concrete beam member - Google Patents

Abstract

PURPOSE:To ensure positions of beam main bars by connection of beam connection members, to execute the connection work easily and accurately and, at the same time, to ensure the strength of connection sections to use simple shores, to enable the withdrawal of the shores at an early time, to make it possible to utilize inserts to install form of the connection section and to require no shore of the forms of the connection sections. CONSTITUTION:Precast concrete beam members can be connected with cast-in- concrete at the center of a span, and in a precast concrete beam member 1 projecting beam main bars 4 from the connection ends, and beam connection members 9 of shape steels are buried in the connection ends to mount. Form mounting inserts 10 are buried in the outsides of the connection ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam material made of precast concrete.

[0002]

[Object of the Invention] The applicant company has previously developed a precast concrete beam material in which the connection is made by cast-in-place concrete in the middle part of the span, and the beam main bar projects from the connection end face. (Patent application No. 78728 in 1990), it is difficult to secure the positions of the main reinforcing bars connected to each other at the connecting portion when the beam material is erected and connected, and the connecting end portion of the beam is connected at the connecting portion. There is a problem in construction that supporting shoring must be installed for a long time.

An object of the present invention is to eliminate the above-mentioned problems in a precast concrete beam material which is designed to be connected by cast-in-place concrete at an intermediate portion of a span and main beam bars project from the connection end face.

[0004]

The basic feature of the present invention is that the precast concrete beam material is designed to be connected by cast-in-place concrete in the middle part of the span, and the main beam of the beam projects from the connection end face. It is a point that a beam connecting member made of shaped steel was embedded in the connecting end partly.

The precast concrete beam material of the present invention is of a precast type in which both the lower main bar and the upper main bar are embedded in the beam body and the semi-precast concrete beam material in which only the lower main bar is embedded in the beam body. Any of precast type may be used.

[0006]

DETAILED DESCRIPTION OF THE INVENTION A beam 1 shown in FIG. 1 comprises a long portion 2 made of precast concrete and short portions 3 and 3, and a central long portion 2 is on a pillar whose both ends are adjacent to each other. The lengths of the short portions 3 at both ends are
The end near the long part 2 is placed on the pillar, and the end on the other side (connecting end) extends to a predetermined position in the middle of adjacent spans (for example, half the span). Has been formed.

The beam 1 is of a semi-precast type, and both ends of a main bar 4 extending over the entire length of the beam 1 project from the end faces (connection end faces) of the short portions 3, and the long portions 2 and each short length. In the upper exposed portion of the stirrup bar 5 embedded in the part 3, the upper main bar 6
Is attached.

The beam member 7 shown in FIG. 2 is composed of only a pair of short length portions 8 and 8 without a long length portion, and one end of each short length portion 8 is placed on the same pillar. In other respects, it is similar to the beam 1.

Reference numeral 9 denotes a beam connecting member made of shaped steel half-embedded and attached to the ends (connection ends) of the beam members 1 and 7, and although it is shown in the drawing as being made of type I steel, Of course, other shape steels may be used.

As shown in FIG. 4, it is preferable to preliminarily embed an insert 10 for mounting the formwork at the connection end portions of the beam members 1 and 7. Also, after connection, prestress is applied. In this case, a sheath (not shown) needs to be embedded in the beams 1 and 7 in advance.

The insert 10 is of a nut shape, and the form of the connecting portion to be bolted using this is
Although not shown, it consists of steel plates reinforced by horizontal and vertical ribs,
By installing this between the connecting ends of the beams 1 and 7,
It is possible to perform concrete pouring work on the connection part without supporting work.

When the beam members 1 and 7 as described above are erected and connected, the beam members 1 and 7 are hung and placed on the column head of the already constructed column (the one-dot chain line in FIGS. 1 and 2 indicates (The center line of the pillar is shown), the connection end is received by the support and work bench 11, and the height of the connection end is adjusted by the jack 12. Then, first, the adjacent beam connection members 9 are attached to each other with the splicing plate 13, Connect with a bolt or the like via 14. Then, the lower main bar 4 and the upper main bar 6 are welded to be continuous, and the connecting portion 15 and the stirrup 5 ′ of the beam / column joint portion 16 are fixed to the regular position,
The formwork of (1) is set, and concrete is poured into the connecting portion 15. At this time, in parallel with the work of the connecting portion 15, the semi-precast floor board is installed, the floor slab is reinforced, and the connecting portion 15, the beam / column joint 16 and the concrete of the floor slab are simultaneously poured. Then, it is preferable to integrate the pillar, the beam, and the floor.

[0013]

EFFECTS OF THE INVENTION The precast concrete beam material of the present invention is expected to have the following effects by mounting a beam connecting member made of shaped steel at the connecting end partly by embedding it. That is, since the position of the main beam of the beam protruding from the beam is secured by the connection of the beam connecting member, the work of connecting the main beam of the beam can be easily and accurately performed. Since the strength of the connecting portion is secured by connecting the beam connecting member, a simple one can be used for supporting and supporting the connecting end portion of the beam at the connecting portion, and its early removal is also possible. In addition, the precast concrete beam material according to the second aspect has an advantage that the insert can be used to attach the formwork of the connection portion and the concrete pouring work of the connection portion can be performed without supporting work.

[Brief description of drawings]

FIG. 1 is an overall side view of an example of a precast concrete beam material according to the present invention.

FIG. 2 is an overall side view of another example of the precast concrete beam material of the present invention.

FIG. 3 is a front view of a connection end portion of the beam member shown in FIGS.

FIG. 4 is a side view showing a connecting work state of the beam members shown in FIGS.

[Explanation of symbols]

1: Beam material, 2: Long part, 3: Short part, 4: Bottom main bar,
5, 5 ': stirrup bar, 6: upper main bar, 7: beam, 8: short part, 9: beam connecting member, 10: insert, 11: support and work bench, 12: jack, 13, 14: Saddle plate, 1
5: connection part, 16: beam-column joint part.

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[Procedure amendment]

[Submission date] October 15, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

Front Page Continuation (72) Inventor Go Takeda 4-2-16 Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture Fudo Construction Co., Ltd. (72) Yoshishi Higashi 4-2 Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture No. 16 Fudo Construction Co., Ltd. (72) Inventor Shinji Matsumoto 4-2-1 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture No. 16 Fudo Construction Co., Ltd. (72) Hiroyuki Tanaka 4-chome, Hirano-cho, Chuo-ku, Osaka-shi, Osaka No. 2-16 Fudou Kenken Co., Ltd.

Claims (2)

[Claims] 1. A precast concrete beam material, which is adapted to be connected by cast-in-place concrete at an intermediate portion of a span and has a beam main bar protruding from a connection end surface, in which a beam connection member made of shaped steel is halfway at the connection end portion. Precast concrete beam material that is embedded and installed. 2. The precast concrete beam material according to claim 1, wherein an insert for attaching the formwork is embedded in the outer surface of the connection end portion.