JPH0530930B2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a temporary support device for reinforcing bars, and is useful, for example, when building reinforced concrete piles with the tops of reinforcing bar baskets below the ground on site, or when constructing underground continuous walls. This invention relates to a temporary reinforcing bar support device used for hanging reinforcing bar cages during construction, etc.

<<Conventional technology>> Generally, reinforced concrete piles (hereinafter referred to as RC piles)
When constructing a wall or an underground continuous wall, a hole is excavated in advance, a separately assembled reinforcing cage is inserted into the hole, and then concrete is poured.

In such so-called cast-in-place RC pile work or construction work for underground continuous walls, if the top of the reinforcing bar cage is located at a lower position than the ground, construction work has traditionally been carried out using the method shown in Figure 5. It was

That is, in FIG. 5, hanging reinforcing bars 3 are attached by welding 4 to the tops of required main reinforcing bars 2 among the plurality of main reinforcing bars 2 constituting the reinforcing bar cage 1.
The reinforcing bar cage 1 is suspended and inserted into the hole 5 drilled below the ground GL. Then, as shown in the figure, with the reinforcing bar cage 1 suspended by the hanging reinforcing bars 3, concrete is poured into the hole 5 to a required position.

In the case of cast-in-place RC piles, after the construction is completed as described above, the ground is excavated (i.e., root cutting) to construct the underground parts of buildings, steel towers, and other various structures.

≪Problem to be solved by the invention≫ As mentioned above, in the conventional cast-in-place RC pile or underground continuous wall construction when the top of the reinforcing bar cage 1 is located at a position lower than the ground GL, the main reinforcement of the reinforcing bar cage 1 The following problems arose because the hanging reinforcing bars 3 were attached to 2 by welding 4.

(1) It takes time and effort to weld the hanging reinforcing bars 3 to the main bars 2.

(2) Since the welded part 4 between the main reinforcement 2 of the reinforcing bar cage 1 and the hanging reinforcing bar 3 is below the ground GL in the groove 5, this welded part 4 should be cut and the hanging reinforcing bar 3 should be recovered after concrete is poured. is not possible.

(3) Due to (2) above, the hanging reinforcing bars 3 are exposed during root cutting, making root cutting work difficult.

(4) Furthermore, when the hanging reinforcing bars 3 cannot be recovered, such as when constructing an underground continuous wall, there is a great economic disadvantage.

(5) Since the hanging reinforcing bars 3 are fixed to the main reinforcing bars 2 of the reinforcing bar cage 1 by welding, the installation position of the reinforcing bar cage 1 cannot be finely adjusted in the height direction.

(6) When welding the hanging reinforcing bars 3, there is a risk of damaging the main reinforcing bars 2 of the reinforcing bar cage 1.

(7) If the hanging reinforcing bars 3 and welded parts 4 cannot be removed, depending on the material of the hanging reinforcing bars 3 and welded parts 4, there is a risk that the reinforcing bar cage 1 will corrode over many years. Selection of these materials becomes difficult.

The present invention has been made in view of the above points, and its purpose is, for example, to
When the top of the reinforcing bar cage is below the ground in construction work such as RC piles or underground continuity, it is easy to insert the reinforcing bar cage into the groove, and it is possible to easily insert the reinforcing bar cage into the groove after concrete is placed. To provide a reinforcing bar temporary receiving device which does not leave any suspended reinforcing bars and allows delicate adjustment of the installation position of a reinforcing bar cage in the height direction.

<<Means for Solving the Problem>> In order to achieve the above object, the temporary reinforcing bar support device according to the present invention uses a threaded reinforcing bar with one end fixed to a hanging jig and one end of a wire rope attached to the other end. The wire rope is inserted through a fixed body for reinforcing bars, and a clamp for suspending reinforcing bars is attached to the other end of the wire rope, and the clamp for suspending reinforcing bars is provided with a lock for suspended reinforcing bars that can be hooked and removed by remote control.

<<Operation>> In the apparatus according to the present invention, first, for example, the vicinity of the top of the main bar of a reinforcing bar cage is attached to a clamp for suspending reinforcing bars, and the lock for suspended reinforcing bars provided on this clamp is directly operated to perform the above-mentioned operation. Lock the main reinforcement and secure the reinforcing bar basket to the clamp.

In this state, when the lifting jig is lifted with a crane or the like, the reinforcing bar cage fixed to the clamp is connected to the threaded reinforcing bar fixed to the lifting jig and the wire rope attached to the threaded reinforcing bar. is suspended.

Continue to operate the crane to move the rebar cage, for example.
Insert the RC pile into the groove for embedding it up to the specified height, and once the screw reinforcing bar fixing body touches the ground, tighten the nut to fix the screw reinforcing bar to the fixing body, and the reinforcing bar basket will be at the specified position in the groove. is set to

At this time, the height of the reinforcing bar cage can be finely adjusted by adjusting the tightness of the nuts.

Next, concrete is placed in the trench above the top of the reinforcing bar cage, and before the concrete hardens, a rope is operated on the ground to unlock the reinforcing bar suspension clamp, and the clamp is removed from the reinforcing bar cage. remove.

Thereafter, when the crane is operated to lift the lifting jig, the reinforcing bar lifting clamp is lifted up via the threaded reinforcing bar and the wire rope, and the device according to the present invention is recovered.

Further, in order to construct another RC pile using the recovered device according to the present invention, the above-described operation may be repeated.

The above is the effect of the device according to the present invention when used in cast-in-place RC pile construction, but the same effect as described above also applies when the device according to the present invention is used not only in this construction but in various similar constructions. .

<<Example>> FIG. 1 shows an example of the apparatus according to the present invention,
A threaded reinforcing bar 11 with one end fixed to a hanging jig 10 and a wire rope 12 attached to the other end is inserted through a threaded reinforcing bar fixing body (hereinafter referred to as a fixing body) 13, and the other end of the wire rope 12 is attached to a threaded reinforcing bar 11 for hanging the reinforcing bar. A clamp (hereinafter referred to as clamp) 14 is attached.

The above-mentioned threaded reinforcing bar 11 is fixed to the fixed body 13 via a washer 16 by tightening a nut 15, and the wire rope 1 of the threaded reinforcing bar 11 is
A shackle 17 is provided at the two side ends.

Further, the above-mentioned wire rope 12 is a hanging wire having thimble 12', 12'' at both ends, and the above-mentioned shackle 17
It is attached to the threaded reinforcing bar 11 via. In addition, the other simple 12'' connects the clamp 14 through the shackle 18 provided on the upper part of the clamp 14.
is installed.

This clamp 14 can be of various types that can firmly grasp the reinforcing bars, but it is limited to clamps that can remotely control the locks for suspended reinforcing bars (hereinafter referred to as locks) to securely clamp the reinforcing bars. For example, Renfroe clamp (product name: DHK, manufactured by Renfroe Japan Co., Ltd.) that can be remotely controlled using a rope 19.
It is preferable to use the clamp disclosed in Japanese Utility Model Application Publication No. 58-95971, or a clamp that can be remotely controlled by turning on or off electricity.

Next, the device according to the present invention shown in this example was installed on site.
The operation mode used in RC pile construction will be explained for each step with reference to FIGS. 2A to 2F, as well as FIGS. 3 and 4.

First, in the step shown in FIG. 2A, the lifting jig 10 shown in FIG.
a is the main bar 22 of the reinforcing bar basket (not shown) of the RC pile
Move it to the top of the screen.

Next, in the step shown in FIG. 2B, the main reinforcing bars 22 are attached to the reinforcing bar support portion 14a.

Then, in step C of FIG. 2, when the rope 19 is relaxed in the direction of arrow α, this rope 1
The lever 14b connected to the lock 14b rotates in the direction of the arrow β, and then the lever 14c linked to the lever 14b rotates in the direction of the arrow γ to lock the lock 14d.
firmly fixes the main reinforcement 22.

Thereafter, in the step shown in FIG. 2D, the crane is operated to suspend the entire apparatus according to the present invention in the direction of arrow δ, and insert the reinforcing bar basket into the RC pile groove.

The state at this time is shown in FIG. Here, in FIG. 3, the same symbols as in FIGS. 1 and 2 have the same meanings as in FIGS. 1 and 2.

When the reinforcing bar cage 1 is inserted into the RC pile groove 5 to a predetermined position, the fixed body 13 shown in FIG.
When suspended, this fixed body 13
Fixed to GL. After this, hang the hanging jig 1 in Figure 1.
Remove 0 from the crane.

The state at this time is shown in FIG. Here, in FIG. 4, the same symbols as in FIGS. 1 to 3 have the same meanings as in FIGS. 1 to 3.

Fine adjustment of the position of the reinforcing bar cage 1 in the height direction is performed by finely adjusting the degree of tightening of the nut 15 to the threaded reinforcing bar 11 in the state shown in FIG.

Next, in this state, concrete is poured to a predetermined position within the RC pile hole 5 (a position slightly above the top of the reinforcing bar basket 1).

Before this concrete hardens, after loosening the nut 15 to eliminate the load on the wire rope 12, in the step shown in FIG.
4b and lever 14c rotate in the directions of arrows β' and γ', respectively, and lock 14d is released.

Finally, in step F of FIG. 2, the lifting jig 10 of FIG. 1 is reattached to the crane and the entire device according to the present invention is lifted. The clamp 14 is removed from this main reinforcement 22 and the device according to the present invention is lifted to the ground.

In addition, the device according to the present invention can be used in substantially the same manner as described above in works other than cast-in-place RC pile work, such as work in which the top of the reinforcing bar cage is below the ground level in an underground continuous wall, and various other similar works. can be used.

Furthermore, if the bottom of the reinforcing bar basket can be placed on the bottom surface of a groove or the like, the device according to the invention may be removed from the reinforcing bars before concrete is poured.

<<Effects of the Invention>> According to the apparatus according to the present invention described above, the following effects can be achieved.

(1) Only the main reinforcing bars need to be attached to and removed from the clamps, and the conventional welding work is not required, so labor and work time are significantly reduced, and there is no risk of damaging the reinforcing bars.

(2) For example, when cutting roots after constructing RC piles, there are no hanging reinforcing bars left behind as in the past, making this root cutting work easier.

(3) In addition, there will be no situation where the suspended reinforcing bars cannot be recovered after construction is completed, eliminating economic disadvantage and problems in selecting the material of the suspended reinforcing bars.

(4) By using the threaded reinforcing bars and nuts, for example, the installation position of the reinforcing bar cage in the height direction can be easily adjusted.

(5) It can be used repeatedly and is economical.

(6) It can be used for cast-in-place RC pile construction, underground continuous wall construction, and a wide range of other construction projects, making it industrially useful.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the apparatus according to the present invention, FIGS. The figures show a state in which a reinforcing bar cage is inserted into a groove using the device according to the present invention shown in Fig.
The figure shows a reinforcing bar basket set in a predetermined position in a groove, and FIG. 5 shows a conventional construction situation. 10... Hanging jig, 11... Screw reinforcing bar, 12...
... Wire rope, 13 ... Screw reinforcing bar fixing body, 1
4... Clamp for suspending reinforcing bars, 14d... Lock for suspended reinforcing bars.

Claims (1)

[Claims] 1 A threaded reinforcing bar with one end fixed to a hanging jig and one end of a wire rope attached to the other end is inserted through a threaded reinforcing bar fixing body, a reinforcing bar hanging clamp is attached to the other end of the wire rope, and the reinforcing bar is A temporary reinforcing bar receiving device characterized in that the hanging clamp is equipped with a lock for suspended reinforcing bars that can be hooked and removed by remote control.