JP2001010773A - Elevator for construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set an elevator frame, a lower platform and a personnel cage back to a set-back position in suspension work near an elevator for avoiding interference with a crane and smoothing work. SOLUTION: This elevator includes a stud frame 4 located on a ground surface and erected and fixed near a continuous underground wall 1, a pair of guide rails located at the upper end of the frame 4 and overhung in horizontal toward an underground area, an elevator frame 7 arranged on the guide rails so as to be movable back and forth with its end being an upper platform, a lower platform 8 suspended from the end of the elevator frame 7 via a wire so as to be movable up and down and a personnel cage 9 to be moved up and down between both platforms.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a construction elevator for connecting a ground surface and a ground bottom so as to be able to ascend and descend in an underground tank construction or the like.

[0002]

2. Description of the Related Art For example, a deep underground tank is constructed by excavating a work section cylindrically surrounded by an underground continuous wall for retaining soil, constructing a skeleton wall inside the underground continuous wall, and constructing a deep underground tank at an underground part. After the bottom slab is constructed, the roof is constructed on the bottom slab, and the roof is lifted. In this underground tank construction, just providing temporary stairs,
Problems arise in terms of human load and time required for lifting and lowering. In particular, as the construction depth becomes deeper as the construction progresses, the work of replacing the temporary stairs becomes necessary, and it takes time to ascend and descend the personnel, which requires excessive labor.

[0003] Therefore, in this type of construction, a construction elevator is temporarily provided, and the elevator is often used to connect the ground surface and the ground floor to transport personnel. This construction elevator has a pillar-shaped pedestal on the ground surface that is erected and fixed near the underground continuous wall, fixed to the upper end of the pedestal, overhangs horizontally toward the underground side, and has a tip Elevator frame with upper platform,
From the lower platform, which is suspended at the tip of the elevator frame so as to be able to ascend and descend, and is usually held in a state of being attached to the bottom of the ground, and from the personnel cage which is pulled by the hoisting mechanism arranged on the elevator frame and ascends between both platforms By adjusting the height position of the lower platform according to the height of the ground floor, the rebuilding work according to the construction progress is not required.

[0004]

By the way, at the time of construction of an underground tank, for example, in order to construct a frame of a skeleton, a segment panel constituting a discarded formwork, a reinforcing bar, a concrete bar, and the like. Although it is necessary to repeat the casting, the work of installing the segment panel and the reinforcing bar is performed exclusively by hanging the crawler crane from the ground surface to a predetermined place from the ground surface. The same construction work is carried out all around the underground tank.However, at the place where the construction elevator is installed, the elevator frame protrudes and the suspension wires are stretched in a complicated manner. Therefore, the present invention solves the above-mentioned problems in that the work of erecting at this position requires a great care, and the work takes time and causes a delay in the construction period. The purpose is to avoid interference with the crane and to smooth the work by retracting the elevator frame, lower platform, and personnel cage together to the setback position when hanging work near the construction elevator. It is intended to provide a construction elevator which can be designed.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above objects, the present invention provides a pedestal-shaped pedestal at the surface of the ground, which is erected and fixed near the underground continuous wall, A pair of guide rails horizontally overhanging toward the basement side, an elevator frame arranged on the guide rails so as to be able to move back and forth, and having a tip at the upper platform, and a wire at the tip of the elevator frame. A lower platform suspended so as to be able to ascend and descend via a wire, and a personnel cage pulled by a hoisting mechanism arranged on the elevator frame via a wire so as to be able to ascend and descend between both platforms.

Therefore, according to the present invention, when a normal elevator is used, it is possible to suspend the lower platform to the bottom of the ground and to raise and lower the personnel cage by positioning the elevator frame at the forward position. In addition, if there is a hanging work near the elevator, both the lower platform and the personnel cage are raised to the upper part, and then the elevator frame is retracted to the retracted position, so that the hanging work can be performed without any obstacles at the working position. it can.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Figure 1
FIG. 4 shows a construction elevator according to the present invention. FIG. 1 shows a normal use state. In the figure, reference numeral 1 denotes an underground continuous wall which is constructed in advance in the ground in a cylindrical shape, and a lower end of the underground reaches an impermeable layer to form a retaining wall, and 2 denotes a ground surface UGL near the underground continuous wall 1. It is a construction elevator located in.

At the stage shown in the figure, the interior surrounded by the underground continuous wall 1 is excavated, and the underground portion 3 is formed. The construction elevator 2 includes a pillar-shaped pedestal 4 erected and fixed on the ground surface UGL, and a pair of guide rails 5 fixed to the upper part of the pedestal 4, the ends of which are horizontally overhanging toward the basement 3 side. , Guide roller 6 on guide rail 5
An elevator frame 7 having an upper platform 7a at the tip thereof, a lower platform 8 suspended below the tip of the elevator frame 7 so as to be able to ascend and descend, and a vertically movable platform 7a, 8 between the upper and lower platforms 7a and 8. Suspended personnel cage 9 and guide roller 6
(Not shown).

The gantry 4 has a three-story structure, for example, and is connected vertically by stairs connecting the floors. On the elevator frame 7, a winch 10 and a building 11 accommodating the same, a guide winch 12, a sheave support frame 14, a top sheave 15 disposed above the support frame 14, an upper guide sheave 16, and a drive And a winding mechanism including various control panels. The lower platform 8 is suspended from the tip of the elevator frame 7 via a suspension wire 17, and is raised and lowered by a guide winch 12 that winds the suspension wire 17.

The personnel cage 9 is suspended by a lifting wire 20 wound on a hoisting winch 10 through a top sheave 15 so as to be able to move up and down, and is lifted up and down on both sides by a guide wire 17 looped between upper and lower guide sheaves 16. Guided and stable lifting operation is performed.

In the drawing, reference numeral 21 denotes a lower platform power supply cable, reference numeral 22 denotes a bogie that circulates on a rail laid on the top end of the underground wall 1, and 23 denotes a lower part of the bogie 22. An anchor installation gondola 24 is a segment panel serving as a formwork arranged on the side surface of the underground wall 1.

In normal use shown in FIG. 1, the elevator frame 7 is fixed at the forward position and overhangs toward the underground part 3, and the lower platform 8 has landed on the ground bottom part LGL by feeding out the wire 17. Therefore, the personnel cage 9 is moved up and down between the upper and lower platforms 7a and 8 by the forward and reverse rotation of the hoisting winch 10, and the personnel gets on and off at each platform, and is utilized for communication between the ground surface and the underground.

From this state, when a reinforcing cage or a segment panel is suspended near the elevator 2, as shown in FIG. 2, after confirming the evacuation of each person, the person cage 9 is moved to the upper platform. 7a and then the lower platform 8 drives the guide winch 12 to raise itself. Then, FIG.
By retracting the elevator frame 7 to the retreat position as shown in FIG. 7, interference at work at this position is removed. Thereafter, as shown in FIG. 4, the crawler crane 25 is advanced to the working position, and the erection work is performed. The figure shows a state in which the reinforcing bar cage 26 is suspended, and the reinforcing bar cage 26 is built between the underground continuous wall 1 and the segment panel 24.

In the drawing, reference numeral 27 denotes already-cast concrete, reference numeral 28 denotes a bottom slab constructed on the ground surface, and reference numeral 29 denotes a roof assembled on the bottom plate 28.

In this operation, while the crane arm 25a is swung to the vicinity of the elevator 2, the wire 25b suspending the reinforcing bar 26 is lowered between the underground wall 1 and the panel 24. During this operation, Since the wire 25b does not interfere with the lower platform 8, the personnel cage 9, or the wires 17, 20, 21 suspending them, the suspending operation can be performed with a sufficient margin.

After the hanging operation is completed and the crawler crane 25 has moved to the operation position, the procedure is reversed.
If the elevator frame 7 is moved forward and the lower platform 8 is suspended to a predetermined position, the transport of personnel by raising and lowering the personnel cage 9 again becomes possible.

[0017]

As is apparent from the above description, according to the construction elevator according to the present invention, during the hanging work near the elevator, the elevator frame, the lower platform, and the personnel cage are all evacuated to the setback position. Thus, interference with the crane can be avoided, and the work can be facilitated.

[Brief description of the drawings]

FIG. 1 is a side view showing a normal use state of a construction elevator according to the present invention.

FIG. 2 is a side view showing the progress of the elevator during evacuation.

FIG. 3 is a side view showing the completion of the evacuation.

FIG. 4 is a side view showing a hanging work mode by a crawler crane near the elevator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Underground continuous wall 2 Construction elevator 3 Basement 4 Base 5 Guide rail 7 Elevator frame 7a Upper platform 8 Lower platform 9 Personnel cage 17 Lower platform elevating wire (guide wire) 20 Personnel cage elevating wire 21 Lower platform power source cable

Claims (1)

[Claims] 1. A gantry, a pair of guide rails at the upper end of the gantry and horizontally overhanging toward a basement side, and are disposed on the guide rails so as to be movable back and forth, and the top end is provided with an upper platform. Elevator platform, a lower platform suspended at the tip of the elevator frame via a wire so as to be able to ascend and descend, and a hoisting mechanism arranged on the elevator frame is towed via a wire to ascend and descend between the two platforms. A construction elevator comprising a staff cage.