JPS60156848A - Iron wire cage for site driving stake - 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] This article relates to a cylindrical reinforcing cage used for reinforcing cast-in-place piles.

In recent years, with the increasing size of buildings and the expansion into areas with soft ground, the bearing capacity required of foundation piles has become increasingly large, and the demand for large-diameter and long piles has increased. In addition, restrictions on noise pollution during construction are becoming stricter year by year, and foundation pile construction methods that generate less noise and are easier to install are being sought.

The cast-in-place pile method was developed as a construction method that satisfies the above social requirements. This cast-in-place pile construction method is a method in which the ground is excavated to form a deep hole, the ends of a large number of reinforcing bar cages are connected and stored in the hole, and then concrete is poured to obtain the pile. According to this method, there are no restrictions on the length and thickness of the piles, and piles with large bearing capacity can be obtained, and since there is no step of pounding the piles, low noise can be achieved.

The above-mentioned reinforcing bar cage consists of a large number of long and straight main bars 1 arranged in a circular shape as shown in Fig. 1, and a large number of circular bars arranged at predetermined pitches in the longitudinal direction of the main bars 1. It is formed by welding the hoop strips 2 at their intersections. Rebar cages were assembled manually at construction sites, but they had the following drawbacks.

(1) Hole drilling is becoming faster and reinforcing bar cages are assembled manually, which is inefficient, and the supply of reinforcing bar cages at the site is not kept up to date, reducing the work efficiency of the cast-in-place pile method. It caused this.

(2) In the case of construction sites in urban areas, it was sometimes impossible to secure a place to organize reinforcing bar cages.

(3) When welding the main reinforcing bars and the 7-p reinforcing bars, due to insufficient heat management, a rapidly cooling structure was formed and the welded part became brittle.

(4) In recent years, it has become difficult to obtain heavy-duty labor, such as the work required to organize reinforcing bars.

In order to eliminate the above-mentioned drawbacks, it is necessary to produce reinforcing bars in a factory, but when long cylindrical reinforcing bars are produced in a factory, it is difficult to transport them to the construction site in order to bulk up the reinforcing bars. becomes difficult or inefficient.

The present invention was developed based on the above-mentioned circumstances, and its purpose is to provide reinforcing bars that can be transported easily and efficiently and that can be manufactured in a factory.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 2 to 5.

The reinforcing bar 10 of this example is constructed by combining two elongated semi-cylindrical reinforcing bar nets 11 shown in FIG. The reinforcing bar network 11 is constructed by welding a large number of straight main reinforcing bars 12 arranged in a semi-cylindrical shape and a large number of 7-pipe reinforcing bars 13 arranged at predetermined pitch intervals in the longitudinal direction of the main reinforcing bars 12 at their intersections. ,It is configured. Note that the hoop reinforcement 13 is thinner than the main reinforcement 12 and has an I& shape. Elongated connecting members 14 are provided on both side edges of the reinforcing bar #A11. The connecting member 14 has an angular cross-section. One plate portion 14a of the connecting member 14 is welded to an end portion of the 7-branch reinforcement 13. A large number of holes 15 are formed in the capacity plate portion 14b of the connecting member 14 along the longitudinal direction. The above connecting member 1
Both ends of 4 are formed shorter than the main reinforcement 13 by a predetermined length.

With the pair of reinforcing bar nets 11 having the above configuration facing each other as shown in FIG. 3, a bolt 16 is inserted into the hole 15 of the connecting member 14, and the bolt 16 and the NAND 17 are tightened to connect the two. From above, a cylindrical reinforcing bar 11o is obtained.

The reinforcing bar net 11 can be produced in a factory using the manufacturing apparatus shown in FIG. That is, a large number of main reinforcements 12 and two connection members 14 are supplied to the vertical feed conveyor 23 by the main reinforcement Figu 21 and the connection member Figu 22. The vertical conveyor 23 conveys the main reinforcements 12 and the connecting members 14 to the pitch feed device 24 . In the pitch feed device 24,
The main reinforcing bars 12 and the connecting members 14 are grasped and conveyed intermittently at predetermined pitch intervals. Near the pitch feeding device 24, there is a 7-
A bar feeder 25 and an automatic spot welding device 26 are arranged. The hoop muscle feeder 25 is the main reinforcement 12
Each time the connecting members 14 are intermittently conveyed at predetermined pitch intervals, straight hoop reinforcements 13 are supplied onto the main reinforcements 12 and the connecting members 14. Then, when the conveyance is stopped, the hoop reinforcement 13 and the main reinforcement 1 are welded by the welding device 26.
2 and the connecting member 14 are welded to obtain a planar reinforcing bar W111. Note that during this welding, the voltage/power load and pressurizing force can be adjusted, and strong welding can be achieved with an appropriate swaging amount. By adjusting the power load speed, it is possible to manage the heat at the welding point and prevent the formation of quenched structures.

Next, the reinforcing bars vA11 are automatically bent by a vertical conveyor 27 and a horizontal conveyor 28 (to a pipe 29), where the reinforcing bar net 11 is bent into a semi-cylindrical shape as shown in FIG.

As described above, the factory-produced reinforcing bar net 11 is transported to a construction site by a truck or the like. During this transportation,
Since a large number of reinforcing bars 11 can be stacked, they can be transported easily and efficiently.

As shown in FIG. 4, a hole 30 is drilled in advance at the construction site, and a support platform 31 is placed around the opening of this hole 30.
is installed. Then, the semi-cylindrical reinforcing bar nets 11 described above are hung together by the tow truck 32 in a state where they are opposed to each other. Then, these reinforcing bar nets 11 are intermittently lowered into the holes 30, and in the process, as described above, the pair of reinforcing bar nets 11 are lowered by bolts 16 and nuts 17.
are connected to form reinforcing bar capacity 10. Next, the reinforced reinforcing bars 10 that have been connected are supported with their necks exposed for a predetermined length by the support stand 31 and removed from the tow truck 32.

After that, the pair of reinforcing bars 11 are suspended again by the tow truck 32, and the reinforcing bars 1 supported by the lower end and the support stand 31 are suspended.
The main reinforcing bars 12 at the upper end of iiiio are overlapped and welded for a predetermined length. Thereafter, the reinforcing bar 10 is removed from the support stand 31, and the reinforcing bar 10 and the pair of reinforcing bar nets 11 above it are lowered into the hole 30 by a tow truck 32. During this lowering process, the pair of reinforcing bar nets 11 are connected again to form a reinforcing bar net 10.

By repeating the above, a large number of reinforcing bars 1 to the bottom of the hole 30 are
0 can be set. After this, concrete is poured into the hole 30 to obtain a pile.

Note that the present invention is not limited to the above-mentioned embodiments, and various embodiments are possible. For example, you can obtain reinforcing bar capacity by connecting three or more reinforcing bar nets with arc-shaped cross sections.

As explained above, in the present invention, reinforcing bar performance is obtained by connecting a plurality of elongated reinforcing bar nets each having an arcuate cross section at both side edges thereof. Therefore, since the reinforcing bar mesh can be transported easily and efficiently, the reinforcing bar mesh can be produced in a factory, and great effects such as improved production efficiency and improved quality can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional reinforcing bar, Figs. 2 to 5 show an embodiment of the present invention, Fig. 2 is a perspective view of a part of a reinforcing bar network, and Fig. 3 is a perspective view of a reinforcing bar. FIG. 4 is a schematic diagram showing a cast-in-place pile construction method, and FIG. 5 is a plan view schematically showing a reinforcing bar net manufacturing apparatus. 10...Reinforcing bar capacity, 11...Reinforcing bar network, 12...Main reinforcement,
13... Hoop muscle, 14... Connecting member, IG,
,, Bolt, ]7...Natsuto Applicant Tokyo Steel Co., Ltd. Company-wide Representative Patent Attorney Noboru Watanabe

Claims (1)

[Claims] In cylindrical reinforcing bars used to reinforce cast-in-place piles,
A reinforcing bar cage for cast-in-place piles, characterized in that a plurality of elongated reinforcing bar nets each having an arcuate cross section are connected at both side edges thereof.