JPH0615077Y2 - Joint structure of lap joints of columns or beams - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a joint structure of precast concrete (hereinafter abbreviated as PC) such as a pillar or a beam in a reinforced concrete structure or an assembled rebar body. .

[Prior Art] Conventionally, in the method of constructing a reinforced concrete structure of this type, particularly in the reinforcing bar lap joint construction method applied when joining column rebars or beam rebars, one by one rebar is used as a lap joint. The current situation is to adopt the method of doing.

[Problems to be solved by the invention] Therefore, in such a conventional method, the work efficiency is very poor, and moreover, the position of the reinforcing bar, the length of the overlapping portion, or the lateral reinforcing bar arrangement of the overlapping joint portion, etc. On the other hand, in addition to not being able to obtain satisfactory results in terms of quality assurance and construction management, for example, a pillar PC body (hereinafter referred to as a PC pillar)
When the main columns of the column are joined by pressure welding or welding, there is a problem that the construction cannot be performed even in a little rain, and it is impossible to connect all the reinforcing rods simultaneously as a rebar cage.

In addition, in the case of joining the individual reinforcing bars by pressure welding or welding in this way, a highly sophisticated technique is required and the working time becomes long.

Furthermore, when connecting the main pillars with mechanical joints such as screws and grips, it is not suitable for connecting all the main bars as a reinforcing bar cage at the same time, and moreover, the number of parts to be assembled increases and the cost increases. There were various problems.

The present invention has been made under the above circumstances, and the purpose thereof is to join lap joints of columns or beams in which all main bars can be simultaneously connected and fixed as a rebar cage. To provide the structure.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention extends main bars from respective spliced end faces of PC bodies to be joined to each other so that the main bars are overlapped with each other. To splice or
Alternatively, in the pillar or beam in which the ends of the assembled rebars to be joined to each other are overlapped with each other and concrete is placed in the lap joint, the PC
Main bars or rebars of bodies or assembled rebar bodies are arranged so as to be adjacent to each other in an annular arrangement with the same center, and a pair of strips are provided in a closed shape at each of the lap joint tip portions of each of the main bars or rebars, The one strip provided on the one PC body or the assembled rebar is arranged on the inner peripheral surface side of the main bar or the rebar, and the other strip provided on the other PC body or the assembled rebar is one strip. It is characterized in that it is arranged on the outer peripheral surface side of the main bar or the reinforcing bar with an outer diameter of the reinforcing bar being separated from the plate.

[Operation] That is, according to the present invention, with the above configuration,
Since the band plate is provided in a closed shape at the tip of the main bar for lap joints, it is possible to connect all the main bars as a rebar cage at the same time, improving work efficiency and preventing individual main bars from popping out. In addition, the lap joint length can be shortened, and the cost can be reduced. Further, at the time of lap joint, the entire lap joint portion can be fixed, and the closed band plate serves as a fixing plate, and at the same time, the main muscles can be easily positioned.

Further, the main bars or reinforcing bars of the PC bodies or the assembled reinforcing bars are arranged so as to be adjacent to each other in an annular arrangement with the same center, and a pair of strips are closed at each lap joint tip of each main bar or reinforcing bar. One strip provided on one PC body or assembled rebar is disposed on the inner peripheral surface side of the main bar or rebar, and the other strip provided on the other PC body or assembled rebar is Since it is arranged on the outer peripheral surface side of the main bar or the reinforcing bar with the outer diameter of the reinforcing bar separated from the strip, the concrete covering thickness for the main bar in the placed concrete can be made uniform and structural isotropic As a result, the strength characteristics required for columns and beams such as shear strength can be obtained even in the lap joint.

Embodiment Hereinafter, the present invention will be described in detail with reference to an illustrated embodiment.

FIG. 1 shows a state of a lap joint before concrete placing at a joint portion of a PC column which is a reinforced concrete structure according to the present invention. (1) is an upper PC column, (11)
Is the lower PC pillar. As shown in detail in FIGS. 2 and 3, a plurality of rectangular main bars (2) ... Extend out to the seaming end surface (1a) of the upper PC column (1), The lap joint tip (2a) of these main bars (2) ...
A strip plate (3) made of an iron plate is arranged in a closed shape (ring shape) on the inner peripheral surface side of the ring-shaped strip plate (3), and each of the main bars (2) is attached to the ring-shaped strip plate (3). By welding (a) ..., The entire lap joint portion is integrally connected. Reference numeral (4) in the figure is a reinforcing plate provided in a cross shape on the inner surface of the ring-shaped strip plate (3).

Similarly, the joined end surface (11) of the lower PC pillar (11) is
As shown in FIG. 4 and FIG. 5 in detail in a), a plurality of main bars (12) ... Arranged in a rectangular shape extend, and the lap joint tips of these main bars (12). Part (12a) ...
On the outer peripheral surface side of the strip plate (1) made of an iron plate with the outer diameters of the main bars (2) and (12) separated from the strip plate (3).
3) are arranged in a closed shape (ring shape), and by welding (b) the respective main bars (12) ... To the ring-shaped strip plate (13), the entire lap joint is integrally connected. It is configured to be. Further, in the figure, (14) is a positioning plate projecting from the seaming end face (11a) of the lower PC column (11) at a plurality of locations, and (15) is the main bar (1).
2) is a hoop muscle that has an appropriate space in the vertical direction so as to surround the periphery of.

That is, the present invention is based on the above-mentioned upper and lower PC columns (1) (1
1) Each lap joint is lap-joined in a state as shown in FIG. 1, and at this time, the main bars (2) (12) of the PC columns are arranged in an annular shape with the same center. Are located adjacent to each other at
The positioning plate (14) provided on the joining end surface (11a) of the lower PC pillar (11) is brought into contact with the inner peripheral surface of the ring-shaped strip plate (3) on the C pillar (1) side for better positioning. It is something that is surely done.

Then, after the upper and lower PC columns (1) and (11) are lap-jointed with each other in this way, the necessary formwork is arranged in these lap joint portions, and concrete is poured.

In addition, in the above-described embodiment, the PC pillar is described as an example of the PC body, but the PC body is not limited to this and can be applied to a beam or the like. In addition, to form columns or beams in cast-in-place concrete,
It can also be applied to the case where the ends of the assembled reinforcing bars are overlapped with each other.

In addition, it goes without saying that the present invention can be variously modified without changing the gist of the present invention.

[Effects of the Invention] As is apparent from the above description, according to the present invention, the main bars are extended from the seaming end faces of the PC bodies to be joined to each other, or the main bars are spliced together. Alternatively, in a column or beam in which each end portion of assembled rebars to be joined to each other is overlapped with each other and concrete is placed in this lap joint portion, PC
Main bars or rebars of bodies or assembled rebars are arranged so as to be adjacent to each other in an annular arrangement with the same center, and a pair of strips are provided in a closed shape at each lap joint tip of each main bar or rebar. One strip provided on the PC body or the assembled rebar is placed on the inner peripheral surface side of the main bar or the reinforcement, and the other strip provided on the other PC or the assembled rebar is attached to the one strip. On the other hand, by arranging the main bars or the outer peripheral surface side of the reinforcing bars with the outer diameter of the reinforcing bars separated, it is possible to connect all the main bars as a reinforcing bar cage at the same time, which improves work efficiency and prevents the individual reinforcing bars from popping out. In addition to being able to prevent this, the length of the lap joint can be shortened, and the cost can be reduced. In addition, at the time of lap joint, the entire lap joint can be fixed, and the closed strip acts as a fixing plate, and at the same time,
This has an excellent effect that the PC or the assembled rebars can be easily positioned to each other.

Furthermore, it is possible to make the concrete covering thickness against the main reinforcement in the cast concrete uniform, to ensure structural isotropy, and to obtain the strength characteristics required for columns and beams such as shear strength at the lap joint. Can also be obtained homogeneously.

[Brief description of drawings]

FIG. 1 is a side view of an essential part showing an embodiment of a joint structure of lap joints of columns or beams according to the present invention, and FIG.
Fig. 3 is a vertical sectional side view of the C pillar, Fig. 3 is a horizontal sectional view taken along line III-III of Fig. 2, Fig. 4 is a vertical sectional side view of the lower PC pillar, and Fig. 5 is a horizontal sectional view taken along line VV of Fig. 4. It is a figure. (1) …… Upper PC column, (1a) …… Splicing end face, (2) …… Main bar, (2a) …… Layered splicing tip, (3) …… Strip plate, (11) …… Lower PC Pillar, (11a) ... Spliced end face, (12) ... Main bar, (12a) ... Splice tip, (13) ... Strip plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiko Masuda 4-640 Shimoseido, Kiyose-shi, Tokyo Inside Obayashi Technical Research Institute Co., Ltd. (56) References: 52-45210

Claims (1)

[Scope of utility model registration request] 1. A main bar is extended from each spliced end surface of each PC body to be joined to each other and these main braces are spliced to each other, or each end of assembled rebar bodies to be joined to each other is connected. Overlap each other,
In a pillar or beam formed by placing concrete in this lap joint, main bars or reinforcing bars of the PC bodies or assembled reinforcing bars are arranged so as to be adjacent to each other in an annular arrangement with the same center, and A pair of strips is provided in a closed shape at each of the lap joint tips of the main bars or the reinforcing bars, and one strip provided on the one PC body or the assembled reinforcing bar is arranged on the inner peripheral surface side of the main bars or the reinforcing bars, and the other The other strip provided on the PC body or the assembled rebar body is arranged on the outer peripheral surface side of the main rebar or the rebar with the outer diameter of the rebar separated from that of the one strip. Joint structure of joints.