JPS58520A - Iron bar cage for on-site concrete pile - 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] The present invention is that the reinforcing bar cages for foundation concrete piles of various civil engineering construction structures have been used to have a straight diameter with a slight cover thickness subtracted from the diameter of the excavation hole, but in recent years, As construction methods have been adopted in which the diameter of the drilled hole is partially enlarged to obtain a large tensile strength, with conventional straight reinforcing bar cages, when the bottom of the pile is enlarged, the reinforcing bars cannot be inserted into the enlarged part. However, that part was made of unreinforced concrete, and there were concerns about its strength. In view of this point, the present invention provides a fully opening mechanism in which the upper part of the branch reinforcing bars is pivoted to the main bar of the reinforcing bar cage, and after the reinforcing bar cage is erected in the excavation hole, the column reinforcing bars are expanded by opening the column reinforcing bars in the enlarged part. To provide a strong reinforced cage for cast-in-place concrete piles having large tensile strength by reinforcing the parts. Embodiments of the present invention will be described below based on the drawings. The first embodiment is an example using a conventional reinforcing bar basket 1 with an expanded hole, and no reinforcing bars are inserted into the enlarged part 2 of the excavation hole, resulting in unreinforced concrete, which poses concerns regarding strength. FIG. 2 shows an embodiment in which the reinforcing bar basket for cast-in-place concrete piles according to the present invention is employed in the enlarged section 2 of an excavation hole, and column reinforcing bars 3 are inserted into the enlarged section 2 for reinforcement. Next, Figures 3 and 4
The figure shows an embodiment of the column reinforcing bar weight mechanism of the present invention. The upper part of each column reinforcing bar 3 is pivotally attached to a fulcrum B installed at a predetermined position of each main bar 3 making up the reinforcing bar cage so that it can be opened and closed, and it slides so as to wrap around the inside of each column reinforcing bar 3 and the outside of the main bar 3. The legs 7 arranged in the same number as the main reinforcements t are attached to the ring and its lower part so as to be able to slide up and down integrally. At this time, the leg portions 7 are extended downward by a required length from the main reinforcing bars so that the column reinforcing bars 3 can be sufficiently expanded. By lowering the reinforcing bar basket/into the excavation hole and seating it on the excavation hole bottom/3, each leg 7 is simultaneously pushed upward, and each column reinforcing bar 3 is opened.

Therefore, the extension is constructed of strong cast-in-place concrete pilings that are reinforced and have a high tensile strength. 5 and 6 show other embodiments of the invention. Each column reinforcing bar 3 is pivotally attached to the fulcrum B attached to each main bar q of the reinforcing bar cage / so that it can be opened and closed, and a branch t is provided at the lower end of each column reinforcing bar 3, and each arm reinforcing bar is pivoted so that it can be opened and closed, Furthermore, the tip of each arm reinforcing bar is pivoted to a fulcrum provided at the outer edge of a tip ring 10 that is attached to annularly wrap around a reinforcing bar cage provided below each main reinforcing bar t. By lowering the reinforcing bar basket l into the excavation hole and seating it on the bottom /'3 of the excavation hole, the fulcrum l is opened to the outside of the main reinforcement t, and the column reinforcing bars 3 and arm reinforcing bars 9 are expanded outward.

The expansion is therefore reinforced and constructed of strong cast-in-place concrete pilings with high tensile strength. As explained above, compared to conventional construction methods, the enlarged portion of the excavation hole is reinforced with column reinforcing bars, and a reinforcing bar cage with a large tensile strength can be constructed in the present invention, which is highly effective.

[Brief explanation of the drawing]

Figure 1 is a schematic sectional view of the conventional construction method, Figure 2 is a schematic sectional view using the present invention, Figures 3 and 4 are weight mechanism diagrams of the embodiment of the present invention, and Figures 5 and 4 are diagrams. is a weight mechanism diagram of another embodiment of the present invention. /: Rebar cage 2: Enlarged part of the drill hole 3: Column reinforcing bar q; Main bar j: Sliding ring 4 B/l: Fulcrum 7: Leg 9: Arm reinforcing bar lO: Tip ring 12 = Reinforcement ring 13: Bottom of the drill hole 1!1st day 2nd round '131S1 1!4th day

Claims (1)

[Scope of Claims] (]) Fully opening to strengthen the enlarged part of the excavation hole by placing branch reinforcing bars pivoted on the main reinforcement of the reinforcing bar cage and seating the reinforcing bar basket on the bottom of the excavation hole to make the branch reinforcing bars heavy. A reinforcing bar cage for cast-in-place concrete characterized by configuring a mechanism (2) The upper end of a branch reinforcing bar is pivotally attached to the outside of the main reinforcing bar of the reinforcing bar basket so as to be openable and closable, and the leg extends downward from the main reinforcing bar by a required length. This is a full-opening mechanism in which a sliding ring with a diameter of 100 mm is placed between the branch reinforcing bars and the main bar, the reinforcing bar cage is seated at the bottom of the excavation hole, and the branch reinforcing bars are pushed up by pushing up the sliding ring and the legs. Reinforcing bar cage for cast-in-place concrete piles (3) The upper end of the branch reinforcing bar is pivotally attached to the outside of the main bar of the reinforcing bar basket so as to be freely openable and closable, and the arm reinforcing bar is pivoted to the lower end of the branch reinforcing bar, and the lower end of the arm reinforcing bar A reinforcing bar cage for cast-in-place concrete piles, characterized by a fully opening mechanism that connects the end ring that is pivoted to the arm reinforcing bar.