JPH03253608A - Erection apparatus of reinforcing steel rod cage - Google Patents

Abstract

PURPOSE:To erect promptly and securely a reinforcing steel rod cage without requiring a crane, by providing a pulling-up device having a receive base of the reinforcing steel rod cage and a protruded metal piece, a suspending device having a lifting mechanism and a frame holding the reinforcing steel rod cage, and an adjusting mechanism. CONSTITUTION:A reinforcing steel rod cage 14 is placed horizontally on a reinforcing steel rod cage receive base 16 so that a protruded metal piece 17 is positioned between the reinforcing steel rods. A winch 12 is operated by a controller 10 to turn the receive base 16 to the R direction in order to lift it vertically. Thereafter, a holding frame 15 for the reinforcing steel rod cage is lowered to the position of a metal block called ornamental hairpin 18 to set the metal block. Next, the reinforcing steel rod cage 14 is lifted a little to separate it from the ornamental hairpin 18 and thereafter, the receive base 16 of the reinforcing steel rod cage is turned to recover the original horizontal condition. And then the suspending apparatus 2 is lowered to connect the reinforcing steel rod cage already erected in the excavated hole with the reinforcing steel rod cage 14. And the metal block or ornamental hairpin 18 is pulled out and the case is suspended in the excavated hole by an automatic operation.

Description

[Detailed Description of the Invention] [Industrial Application Fields] The present invention is applicable to the construction of continuous walls that serve as earth retention for foundation work of shafts or large structures such as subways, underground passages, and sewers, and the construction of combined foundations of large structures. The present invention relates to a device for erecting reinforcing bar cages at predetermined locations, which are used in construction work, lifting or horizontal movement of large structures or large mechanical devices, and other operations.

[Conventional technology] Rebar cages are usually assembled and processed in a horizontal state, so when erecting them, conventionally, two crawler cranes were used to raise them from a horizontal state to a vertical state by so-called weighing.

Here, the entire length of one element of the reinforcing bar cage is divided into several rods, and each rod is often joined by lap welding of the longitudinal main reinforcing bars, which is very heavy.

Therefore, a crawler crane with a lifting capacity of several hundred tons is generally used to lift the reinforcing bar cage into an excavated hole.

Furthermore, when reinforcing bars with screw threads are used as the main reinforcement in the longitudinal direction of the reinforcing bar cage and are connected with nuts, or when the main reinforcing bars are pressed together, high precision is required for suspending the reinforcing bar cage.

Therefore, protruding hardware (so-called "kanzashi") is installed on the side of the reinforcing bar cage.
), a device has been developed in which holes are arranged to accommodate the hooks, and the hooks are hung while being replaced.

[Problems to be Solved by the Invention] However, when the reinforcing bar cage is pulled up by a crane, there is a problem in that the reinforcing bar cage is deformed by its own weight, causing trouble during joint work.

Additionally, there is a risk that the vertical reinforcing bar cage will fall due to the reaction when it is raised.

Furthermore, there is a limit to the lifting of objects by large cranes depending on the weight of the object to be lifted, and as mentioned above, the weight of reinforcing steel cages is large. Therefore, it is extremely difficult to lift a reinforcing bar cage using a crane, especially when using the joint method, which requires high lifting accuracy.

In addition, in the case of the above-mentioned device that performs lifting while replacing the bar cage (protruding hardware) mentioned above, it is necessary to use a crane until the reinforcing bar cage is held by the device.
The above-mentioned inconvenience occurs. Furthermore, when hoisting a reinforcing bar cage, the reinforcing bar baskets must be replaced while being lowered, making it impossible to carry out continuous work and resulting in a lot of lost time, resulting in very poor work efficiency.

In view of these problems, there is a need for a reinforcing bar cage erecting device that can quickly and accurately erect a reinforcing bar cage without the need for a crane. The present invention was developed in response to such demands.

[Means for Solving the Problems] In the reinforcing bar cage erection device of the present invention, the reinforcing bar cage holder, on which the frame and the reinforcing bar cage are placed and rotated from a horizontal state to a vertical state, holds the stand and the reinforcing bar cage. a lifting device including a plurality of protruding hardware;
The present invention includes a lifting device that includes a lifting mechanism and a reinforcing bar cage holding frame provided with protruding hardware holding means, and that automatically suspends and lowers the reinforcing bar cage, and an adjustment mechanism that adjusts the position of the reinforcing bar cage.

In carrying out the present invention, the reinforcing bar cage support is configured such that one end thereof is pin-coupled to the pedestal and is rotated from a horizontal state to a vertical state by a wire, a winch, and a pulley provided on the pedestal. It is preferable that However, a hydraulic jack or the like may be used instead of the wire and winch.

Further, the elevating mechanism includes center hole jacks arranged vertically, and a rotating nut rotatable by a motor.
Preferably, it comprises a screw passing through the center hole jack and rotating nut and having threads formed throughout.

Further, the adjustment mechanism adjusts the upper and lower jacks by a signal from a limit switch for detecting the upper and lower limit positions of the rotary nut, the upper and lower limit positions of the jack, or the position where the upper and lower center hole jacks exchange loads. It is preferable to have a control mechanism consisting of a microcomputer that controls opening and closing of the hydraulic electromagnetic pulp for moving up and down, and driving and stopping of the motor that rotates the rotary nut.

Here, a photoelectric switch may be used instead of the limit switch. The motor that rotates the rotary nut may be an electric motor or a hydraulic motor.

[Function] According to the reinforcing bar cage erecting device of the present invention having the above-described configuration, the reinforcing bar cage assembled in a horizontal state is mounted and held on the pulling device as it is, and It can be raised to a vertical position by rotating. If the frame is installed above the excavation hole, the reinforcing bar cage will automatically stop on the center line of the excavation hole. Therefore, there is no need for a crane or equipment dedicated to lifting.

Furthermore, even if a hydraulic jack is used for the lifting mechanism, the lifting device reduces the waiting time when changing the load receiver, allowing continuous operation without waiting for the jack to rise or fall. Therefore, the reinforcing bar cage can be quickly lifted and lowered.

Furthermore, when jointing a rebar cage that has been erected, the adjustment mechanism accurately adjusts the horizontal and vertical positions of the newly erected rebar cage, making it possible to align the joints with high precision. It can be done by This is particularly advantageous in the case of threaded joints.

Note that it is also possible to use the above-mentioned lifting mechanism alone as a lifting device.

[Example code] The present invention will be described in detail below with reference to the drawings.

In FIGS. 1 to 3, one end of a pedestal 16 of the reinforcing bar cage support is connected with a pin (indicated by 16a) at the lower part of the pedestal indicated by reference numeral 1. The reinforcing bar cage support has a pulley 16 at the other end of the stand 16.
The pulley 16b is connected to a winch 12 provided at the bottom of the pedestal 1 by a wire rope 11 via a pulley 1a provided at the top of the pedestal 1. As a result, when the winch 16 is driven, the reinforcing bar support platform 16 rotates around the point 16a, changing from a horizontal state to a vertical state. This rotation is controlled by an upper limit switch (not shown) provided at the top of the pedestal 1, a lower limit switch (not shown) provided at the bottom, and the control panel 13.

Landings are provided at the middle and top portions of the pedestal 1, and on the top landing, a lifting device 2 is installed via a horizontal adjustment mechanism 8.
is installed.

Hanging device li! In step 2, align the center hole jacks 3 and arrange them vertically in sets of 8.
and FIG. 12), a rotating nut 4 is disposed above each center hole jack 3, and a fully threaded screw 5 is passed through each of them to form an elevating mechanism. Four sets of such elevating mechanisms are installed. Here, as shown in FIG. 1, a guide vibro is provided at the upper part of the elevating mechanism to guide the protruding screw 5.

On the other hand, the four screws 5 protruding downward are pin-coupled to the reinforcing bar cage holding frame 15.

At the bottom of the reinforcing bar cage holding frame 15, there is constructed a mechanism in which a plurality of comb-shaped kanzashi (protruding hardware) holding means are provided, and this mechanism is adapted to suspend heavy objects.

The center hole jack 3 uses a hydraulic unit 7 (Fig. 2) as its hydraulic drive source, and the lifting device 2
The entire operation is controlled by a control panel 10 using a microcomputer. Here, the four sets of elevating mechanisms described above are adjusted in the horizontal direction by a horizontal adjustment mechanism 8 and a hydraulic unit 9.

Below, with reference to Fig. 4, Fig. 5, and Fig. 6, the reinforcing bar cage 1
The procedure for lifting work in step 4 will be explained.

First, the reinforcing bar cage 14 is placed horizontally on the reinforcing bar cage holder 16, and the protruding hardware (kanzashi) 17 is installed so as to fit into the gap between the reinforcing bars.

Next, the winch 12 (Fig. 3) is operated by the control panel 10, and the reinforcing bar cage holder 16 is rotated as shown by arrow R in Fig. 4 until the limit switch (which detects the upper limit position) is activated. , until it becomes vertical. Then, by operating the lifting device t2, the reinforcing bar cage holding frame 15 is lowered to a predetermined setting position of the kanzashi 18.
Setting.

After the setting is completed, the lifting device t2 is operated to pull up the reinforcing bar cage 14 by a certain amount. After confirming that the edges of the reinforcing bar basket 14 and the metal fittings 17 are cut, remove the reinforcing bar basket holder 16.
Rotate in the opposite direction of arrow R to return to the original horizontal state.

Next, the lifting device 2 is lowered and the reinforcing bar cage 14', which has already been set in the excavated hole, is connected to the reinforcing bar cage 14 using a screw joint. After joining, pull up the reinforcing bar cage 14.14- by a slight amount and pull out the kanzashi 18". Then,
The plane position and verticality of the connected reinforcing bar baskets 14, 14' are adjusted, and then they are automatically suspended into the borehole.

Next, the rotating nut used in the lifting mechanism of the lifting device 2 will be explained.

In FIGS. 9 to 11, the rotating nut 4 is connected to a driving gear motor to which a sprocket wheel 20 is attached.
The sprocket wheel 19 is rotatable by connecting the sprocket wheel 21 bolted to the rotating nut 4 via a chain 22.

The rotating nut 4 and the non-rotating rotating nut holding frame are connected by a bearing, and the driving gear motor
Guide rollers 23 are provided to prevent the holding frame from rotating due to reaction when the motor 19 is driven. The guide roller 23 is guided in the vertical direction by two guide pipes 24. Due to the action of the guide roller 23, when the geared motor 19 is driven, only the rotary nut rotates, and the entire rotary nut mechanism moves up and down.

As will be described later, the rotating nut mechanism is detected by an upper limit switch 29 and a lower limit switch 28. Further, the center hole jack 3 is detected by an upper limit switch 27 and a lower limit switch 26. Further, the upper limit switch 31 and the lower limit switch 30 detect a state in which the load is being exchanged between the upper center hole jack 3 and the lower center hole jack 3. The microcomputer that receives the detection signals from these limit switches (
The lifting and lowering operations by the rotating nut mechanism and the upper and lower center hole jacks 3 are automatically controlled by the sequencer.

Referring to FIG. 12, the lifting and lowering operations by the rotating nut mechanism and the upper and lower center hole jacks 3 will be explained. In addition,
In FIGS. 12(A) to 12(H), the rotary nut on which the load is applied is shown with hatching, and the symbol X is added to make it easier to understand the movement of the screw 5. reference point.

First, the lifting work will be explained with reference to FIGS. 12(A) to 12(D).

As shown in FIG. 12(A), raise the lower center hole jack 3' (symbol a) and tighten the lower rotating nut 4.
' is pushed up by a slight amount (symbol b).

Then, the load on the upper rotary nut 4 indicated by symbol C is released, and the load is transferred to the lower rotary nut 4'.

Then, as shown in FIG. 12(B), the lower center hole jack 3- is pushed up (symbol d), and the rotating nut 4' is pushed up (symbol e). By pushing up the rotating nut 4', the screw 5 is pushed up (symbol f). Then, the center hole jack 3 is lowered several seconds after the center hole jack 3' is raised (sign g).

After a few seconds delay from the lowering of the center hole jack 3, which is indicated by the symbol g, the rotary nut 4 is rotated and lowered (the symbol h).
.

Next, in FIG. 12(C), the symbol iSj,k.

1 and m indicate that the operation indicated by the code dz ex fs gS'1 is being continued.

Further, as shown in FIG. 12(D), when the center hole jack 3' is stopped at its upper limit (symbol n), the rotating nut 4' is stopped (symbol 0). Then, as the rotating nut 4- stops, the screw 5 stops (symbol p).

On the other hand, if the upper center hole jack 3 is stopped at the upper and lower limits (symbol q), the upper rotating nut 4 is stopped at the lower limit (symbol r). Then, the upper center hole jack 3 is raised slightly, and the load on the lower rotary nut 4' is transferred to the upper rotary nut 4 (symbol S).
.

After that, repeat the operation with the upper and lower members reversed.

By repeating the operations shown in FIG. 12(A) to FIG. 12(D) and the operation with the same upside down, the screw 5 will rise.

Next, referring to FIG. 12(E) to FIG. 12(H),
Explain the lowering operation.

First, as shown in FIG. 12(E), the upper rotary nut 4 is placed under load, and the lower rotary nut 4 is
′ is rotated and raised (symbol a゛). Next, the sign b'
As shown in , the lower center hole jack 3 is raised a few seconds after the rotating nut 4' is raised, and the upper center hole jack 3 starts lowering almost at the same time as the lower center hole jack 3' is raised. (Code c-).

As the center hole shirt in the upper stage is lowered, the rotating nut 4 in the upper stage is lowered as indicated by the symbol d'. As a result, as indicated by the symbol e', the screw 5 descends as the upper rotary nut 4 descends.

Next, as indicated by the symbol f' in FIG. 12(F), the lower rotary nut 4' is rotated and raised. Then, as shown by the symbol g', the lower center hole jack 3
′ is increased. Also, the upper center hole jack 3 is lowered (symbol h-). Here, as the upper center hole jack 3 descends, the upper rotary nut 4 descends (symbol i'), and as the upper rotary nut 4 descends, the screw 5 descends (symbol j-).

When each member has moved a predetermined distance, the lower rotary nut 4' is stopped at the upper limit, as indicated by the symbol '' in FIG. 12(G). And the lower center hole jack 3'
If the upper center hole jack 3 is stopped at the upper limit (symbol l') and the upper center hole jack 3 is stopped at the lower limit (symbol m'), the upper rotating nut 4 will stop as the upper center hole jack 3 stops. (symbol n'), and the screw 5 stops as the upper rotary nut 4 stops (symbol 0-). In this state, as shown in FIG. 12 (H), lower the upper center hole jack 3 again. When the lower limit is reached by a certain amount (symbol p'), the screw 5 is lowered by a certain amount (symbol q-) as the upper center hole jack 3 descends. and,
As the screw 5 descends by a certain amount, the load that was being received by the upper rotary nut 4 is transferred to the lower rotary nut 4-, as indicated by the symbol r'.

After that, repeat the operation with the upper and lower members reversed.

By repeating the operations shown in FIG. 12(E) to FIG. 12(H) and the operation with the same upside down, the screw 5 will be lowered.

FIG. 13 shows the control mechanism used in the above embodiment, which includes a center hole jack downstream lower limit switch 26, a center hole jack upper limit switch 27, and a rotating nut lower limit switch 28. , an upper limit switch 29 for the rotating nut, a lower limit switch 30 for the center hole jack, and an upper limit switch 31 for the center hole jack are attached to the limit switch support rod 25 (FIG. 9) as sensor means. Signals from these sensor means are transmitted to the microcomputer 32 in the control panel 10. On the other hand, instructions from the upper operation box 34 and the lower operation box 35 are also transmitted to the microcomputer 32. .

The control mechanism has a control unit 33 composed of a magnetic switch, a relay, etc., and this unit is connected to a solenoid valve unit 36 for the center hole jack and a solenoid valve 37 for the horizontal adjustment jack. It is configured to be activated in response to a command.

[Effects of the Invention] According to the present invention described above, when raising a reinforcing bar cage, two
Since there is no need to carry out joint lifting work using a crane, work safety is improved and work costs are kept low.

Furthermore, since the reinforcing bar cages can be suspended continuously, lost time during work is reduced and the construction period is shortened.

Furthermore, when connecting the upper and lower rods of a reinforcing bar cage with screws, it is possible to adjust the horizontal position, adjust the verticality, and make fine adjustments at each of the four vertical corners, making the tightening work with screws easier. Therefore, the effort spent on it is reduced.

Further, since the reinforcing bar cage can be smoothly erected in the excavated hole, there is less risk of the hole wall collapsing.

In addition to this, it is possible to use a hydraulic mechanism for the lifting device, and with such a configuration, it is possible to suspend heavy objects, which is suitable for use on continuous walls at great depths.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a plan view of the embodiment, Fig. 3 is a side view of the embodiment, and Fig. 4 shows the procedure for suspending a reinforcing bar cage. Fig. 5 is an enlarged side view of section A in Fig. 4, Fig. 6 is an enlarged front view of section A, and Fig. 7 shows details of the lifting device. 8 is a front view, FIG. 9 is an enlarged plan view showing details of the lifting mechanism of the lifting device, FIG. 10 is an enlarged front view, and FIG. 11 is a rotating nut and control limit. 12(A) to (H) are partially enlarged views showing the operating sequence in the lifting mechanism of the lifting device;
D) shows the ascending process, FIGS. 12(E) to (H) show the descending process, and FIG. 13 is a block diagram showing the control mechanism in the embodiment shown in FIGS. 1 to 12. . 1... Frame 2... Lifting device 10... Control panel 14... Rebar cage 15... Rebar cage holding frame 16... Rebar cage support is stand 17.18... Protruding hardware ( (Kanzashi) Figure U-12 Figure 5 Figure 9 Figure 0 Figure 1 Figure Procedure Amendment (Method) June 28, 1990

Claims (1)

[Claims] A lifting device including a reinforcing bar cage holder on which a frame and a reinforcing bar cage are placed and rotated from a horizontal state to a vertical state, and a plurality of protruding hardware for holding the reinforcing bar cage, a lifting mechanism, and a protruding hardware holding means are provided. 1. A reinforcing bar cage erection device comprising: a reinforcing bar cage holding frame; a lifting device that automatically suspends the reinforcing bar cage; and an adjustment mechanism that adjusts the position of the reinforcing bar cage.