JP2001159134A - Cage-building method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cage-positioning method, in which an extra-large crane and a holding steel material having large strength are made unnecessary and the positioning works of a cage are facilitated. SOLUTION: This method includes process, in which an operating pin 7 for a power jack 6 inserted into the pinhole 4a of a reinforcing material 4 for the cage 1 is lowered, a holding pin 8 in inserted into the pinhole 4a and the cage 1 is held, the holding of the cage 1 by the operating pin 7 is released, the operating pin 7 is lifted, the cage 1 is held by inserting the operating pin 7 into the pinhole 4a, and the holding of the cage 1 by the holding pin 8 is released is repeated, and the cage 1 is positioned into a pile pit 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for installing a reinforcing steel cage in a continuous piled foundation wall of a large building such as a bridge or a skyscraper.

[0002]

2. Description of the Related Art The foundation pile of a large building such as a bridge or a skyscraper has a diameter of about 5 meters and a length of 20 meters or more. It is built in a pile hole. The conventional method of installing a large-diameter cast-in-place pile reinforced car is to suspend a reinforced car 21 into a pile hole 22 with a crane wire 20 and to provide a reinforcing material 2 for the reinforced cage 21.
First, the first rebar cage building process for holding the rebar cage 21 by passing the holding steel material 24 to the lower side of FIG. 3 (FIG. 9), and suspending the next rebar cage 21 A with the crane wire 20 to move the Step of connecting the reinforcing bars to the car (Figs. 10 and 1)
1) and crane wires 21, 21A with crane wires 20
Is lifted, the holding steel material 24 is pulled out, and the reinforced cages 21 and 21A are lowered into the pile holes 22 by the crane wire 20,
The rebar cage lowering step (FIGS. 12 and 13) of holding the rebar cages 21, 21A by passing the holding steel material 24 below the reinforcing member 23 of the rebar cage 21A is executed. Then, the rebar car connecting process is repeatedly executed again to reinforce the rebar cages 21 and 21A.
・ ・ Is built. Thus, the reinforced basket 21, 21A
In order to suspend the entire weight of the crane by the wire 20 of the crane, a very large crane is required. Moreover, in order to hold | maintain the whole weight of the rebar basket 21, 21A ... with the holding steel material 24, the large holding steel material 24 with high intensity | strength is needed,
It is a difficult task to transfer and pull out the holding steel material 24.

[0003]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, and does not require a super-large crane and a high-strength holding steel material. It is an object of the present invention to provide a method of building a reinforcing steel cage such as a cast-in-place pile or an underground continuous wall, which facilitates a building operation. Another object of the present invention is to provide a cast-in-place pile or an underground continuous wall in which a reinforced car can be built in a place where a work space is narrow and a large crane cannot be installed or where the height of the sky is limited. To provide a method of building a reinforced cage.

[0004]

SUMMARY OF THE INVENTION The present invention uses a power jack installed on a gantry foundation around an excavation hole and a crane provided near the excavation hole to sequentially use a plurality of divided steel cages. In the method of erection of a reinforced car connected and built in a digging hole, the power jack is provided with an operating pin that moves up and down and expands and contracts and a holding pin that expands and contracts, and a pin hole is provided in a vertical reinforcing member of the reinforced cage. , Hanging the reinforced car into the excavation hole, inserting the holding pin of the power jack into the pin hole of the reinforcing material of the reinforced car, holding the first reinforced car, and suspending the next reinforced car Connect the power jack's operating pin to the reinforcing material pin hole of the reinforcing rod cage to hold the reinforcing rod basket,
Rebar cage connection process to release the holding of the reinforcing bar cage by the retaining pin, lowering the operation pin of the power jack, lowering the reinforcing bar cage into the pile hole, inserting the retaining pin into the pin hole of the reinforcing member of the reinforcing bar cage, Hold the car, release the holding of the reinforcing bar by the operating pin, raise the operating pin, insert the operating pin into the pin hole, hold the reinforcing bar, and release the holding of the reinforcing bar by the holding pin. Execute the process. Then, the rebar car lowering step is performed a plurality of times, and after the rebar car lowering step is performed, the rebar car connecting step is performed again.

[0005]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a reinforcing bar cage 1 includes a reinforcing bar 2 assembled in a lattice shape and a U
It comprises a longitudinal reinforcing member 4 and a circumferential reinforcing member 5 attached with bolts 3 or the like. The vertical reinforcing member 4 is provided with a pin hole 4a into which a pin of a power jack described later is inserted. The reinforcing members 4, 5
The number and strength of the steel bars 1 are determined according to the weight of the reinforcing cage 1.

As shown in FIG. 2, the power jack 6 is provided with an operating pin 7 and a holding pin 8. The operating pin 7 is extended and contracted by a hydraulic cylinder 9, and the hydraulic cylinder 9 is attached to a pedestal 12 that moves up and down by a hydraulic cylinder 11 provided on a main body 10. The holding pin 8 is extended and contracted by a hydraulic cylinder 13, and the hydraulic cylinder 13 is attached to a base 14 of the main body 10.

As shown in FIG. 3, the lowering and holding of the reinforced car 1 by the power jack 6 is performed by moving the operating pin 7 of the power jack 6 installed on the gantry base 16 of the excavation hole 15 to the reinforcing member 4 of the reinforced car 1. In the state inserted in the pin hole 4a, the hydraulic cylinder 11 is driven to lower the pedestal 12,
The reinforced cage 1 is built in the excavation hole 15. Then, the hydraulic cylinder 13 is driven, the holding pin 8 is protruded and inserted into the pin hole 4a, and the rebar cage 1 is held by the holding pin 8. Next, the hydraulic cylinder 9 is driven to retract the operating pin 7, and the hydraulic cylinder 11 is driven to move up the pedestal 12. Then, the hydraulic cylinder 9 is driven to insert the operating pin 7 into the pin hole 4a, the reinforcing pin 1 is held by the operating pin 7, the hydraulic cylinder 13 is driven, the holding pin 8 is retracted, and the reinforcing rod 1 is held. To release. The above operation is repeated, and the rebar cage 1 is built into the pile hole 15 like a shading insect.

Next, a method of building a reinforcing cage according to the present invention will be described with reference to FIGS. A plurality of power jacks 6 are installed on a gantry foundation 16 formed around the pile hole 15, and a plurality of reinforcing bars 1 are placed thereon. The number of power jacks 6 is determined according to the weight of the reinforcing cage 1. First rebar cage construction process (Fig. 4)

The reinforcing bar 1 is suspended in the excavation hole 15.
Then, the hydraulic cylinder 13 of the power jack 6 is driven, the holding pin 8 is protruded and inserted into the pin hole 4a of the reinforcing member 4 of the reinforcing cage 1, and the reinforcing cage 1 is held by the holding pin 8. In this manner, the reinforcing bar 1 is held by the holding pins 8 of the power jack 6, and the suspension of the reinforcing bar 1 is released. Rebar cage connection process (Figs. 5 and 6)

The following reinforcing bar 1A is suspended, and the reinforcing bar 1
A is connected to the reinforcing bar 1. Then, the hydraulic cylinder 9 of the power jack 6 is driven, the operating pin 7 is protruded and inserted into the reinforcing member 4 pin hole 4a of the reinforcing rod car 1A, and the operating pin 7 holds the reinforcing rod cages 1 and 1A. As described above, the reinforcing rods 1 and 1A are held by the operating pins 7 of the power jack 6, the hydraulic cylinder 13 is driven to retract the holding pins 8, and the holding of the reinforcing bars 1 and 1A by the holding pins 8 is released. The suspension of 1A is also released. Rebar cage lowering process (Figs. 7 and 8)

The hydraulic cylinder 11 of the power jack 6 is driven to lower the pedestal 12.
Descend into 5. Then, the hydraulic cylinder 13 of the power jack 6 is driven, and the holding pin 8 is projected so that the reinforcing cage 1
A is inserted into the pin hole 4a of the reinforcing member 4 of FIG. 1A, the reinforcing bars 1 and 1A are held by the holding pins 8, and the hydraulic cylinder 9 is driven to retract the operating pins 7 so that the operating pins 7 hold the reinforcing bars 1 and 1A. Cancel. Next, the hydraulic cylinder 11 of the power jack 6 is driven to raise the pedestal 12, the hydraulic cylinder 9 is driven, the operating pin 7 is protruded, and the pin hole 4 is formed.
a, the rebar cages 1, 1A are held by the operating pins 7, the hydraulic cylinder 13 is driven to retract the holding pins 8, and the holding of the rebar cars 1, 1A by the holding pins 8 is released.

[0012] This rebar car lowering step is performed a plurality of times,
The rebar baskets 1 and 1A are lowered into the pile holes 15 like a scale insect. When the reinforced cars 1, 1A have descended into the pile holes 15, the reinforced car connection process is executed again, and the reinforced cars 1, 1A,...

[0013]

As described above, the method of building a reinforced car according to the present invention is as follows: (1) Since the reinforced car is lowered and held by the power jack, only a single reinforced car is moved to the excavation hole, so that No crane is required. (2) Since a super-large crane is not used, it can be constructed even in a narrow place or under an elevated place. (3) By increasing or decreasing the number of power jacks, it becomes possible to build a large-diameter reinforced cage. (4) Since all the weight of the rebar is received by the reinforcing material attached to the rebar basket, the rebar is not deformed during construction. (5) As a result, the construction work of the reinforcing cage is facilitated, and the construction cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a reinforcing bar cage used in the method of building a reinforcing bar cage according to the present invention.

FIG. 2 is a perspective view of a power jack used in the method of building a reinforcing bar cage according to the present invention.

FIG. 3 is a view for explaining lowering and holding of a reinforcing cage by a power jack.

FIG. 4 is a view for explaining a method of building a reinforcing bar cage according to the present invention.

FIG. 5 is a view for explaining a method of building a reinforcing bar cage according to the present invention.

FIG. 6 is a view for explaining a method of building a reinforcing bar cage according to the present invention.

FIG. 7 is a view for explaining a method of building a reinforcing bar cage according to the present invention.

FIG. 8 is a view for explaining a method of building a reinforcing bar cage according to the present invention.

FIG. 9 is a diagram illustrating a conventional method of building a reinforcing bar.

FIG. 10 is a diagram illustrating a conventional method of building a reinforcing bar cage. The figure explaining the conventional rebar cage construction method.

FIG. 11 is a diagram illustrating a conventional method of building a reinforcing bar cage.

FIG. 12 is a diagram illustrating a conventional method of building a reinforcing bar cage.

FIG. 13 is a view for explaining a conventional method of building a reinforcing bar cage.

[Explanation of symbols]

 1, 1A ... Reinforcing cage 2 ... Reinforcing bar 3 ... U bolt 4, 5 ... Reinforcing material 4a ... Pin hole 6 ... Power jack 7 ... Operating pin 8 ... Holding Pins 9, 11, 13 ... Hydraulic cylinder 10 ... Body 12 ... Pedestal 14 ... Base 15 ... Pile hole 16 ... Stand base

Claims (3)

[Claims] 1. A method for installing a reinforcing car in a digging section by sequentially connecting a plurality of divided reinforcing cars using a power jack, wherein the power jack includes an operating pin that moves up and down and expands and a holding pin that expands and contracts. Is provided, and a pin hole is provided in the reinforcing member in the longitudinal direction of the rebar cage, and the first rebar cage in which the holding pin of the power jack is inserted into the pin hole of the reinforcing member of the rebar cage and suspended in the excavated portion. And the next reinforced car is suspended in the excavation section, connected to the reinforced car, and the power jack of the power jack is inserted into the pin hole of the reinforcing material of the reinforced car to remove the reinforced car. Rebar cage connection process for holding and releasing the holding of the reinforced cage by the retaining pin, lowering the operating pin of the power jack to lower the reinforced cage into the excavation section, and inserting the retaining pin into the pin hole of the reinforcing member of the reinforced cage I Reinforcement cage that holds the reinforcing bar cage, releases the holding of the reinforcing bar cage by the operating pin, raises the operating pin, inserts the operating pin into the pin hole, holds the reinforcing bar cage, and releases the holding of the reinforcing bar cage by the holding pin. A method of building a reinforcing bar cage, comprising performing a car lowering step. 2. The method according to claim 1, wherein the step of lowering the rebar cage is performed a plurality of times. 3. The rebar car connecting step is executed again after the rebar car lowering step is executed.
How to build a reinforced basket described in.