JP2629529B2 - Concrete panel drawing method and drawing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for extracting a concrete panel installed underground as a water blocking wall or the like.

[0002]

[Problems to be Solved by the Invention] In the caisson laying construction method, a water blocking wall method incorporating a concrete panel is used. In this method, a plurality of concrete panels are erected vertically, horseshoe-shaped or circular temporarily closed, and the pier is partially pulled out and removed.

Conventionally, as a means for pulling out such a built-in concrete panel, a special length shackle and a metal plate or the like machined with an iron plate are used as a pull-out connecting metal, and a multi-pulley device mounted on a crane is used. How to pull out.

[0004] There has been a method in which a rope material for chucks is embedded in a concrete panel, and the rope material is directly chucked with a vibro hammer and pulled out using vibration.

However, in the above-mentioned method using the multiple pulley device, the adjacent panel is used as the reaction ground, but the panel width is small and there is a danger of overturning. There was a problem that an auxiliary crane was required for the overturning work after the panel was pulled out.

In the method of pulling out using the vibration described above, since the vibrating force of a vibro hammer or the like is directly transmitted to the concrete panel, cracks occur in the panel, or the embedded rope and concrete are separated and damaged. There were problems such as the panels being unable to be removed and the panels being unable to be reused.

The present invention has been made in view of the above problems. The purpose of the method is to remove concrete panels with excellent workability and to be able to reuse concrete panels without damaging the drawn panels, and a concrete panel drawing device with a simple mechanism and easy installation. There is to propose.

[0008]

In a drawing method of pulling up a concrete panel built in the ground, a vibratory hammer is lifted by a crane, and a resonating portion attached to the vibrohammer and a grounding method are carried out. Attachment part provided on the concrete panel is connected with a wire rope, and the vibration of the vibrohammer is transmitted to the concrete panel via the wire rope. The main purpose is a method for extracting a concrete panel, which is characterized by extracting the panel.

[0009]

FIG. 1 shows a foundation 1 made by the caisson laying method and a pier 2 built thereon. The pier 2 is surrounded on the foundation 1, and its major axis is 13m, minor axis is 8m, and height is 8.7.
An m-shaped water stop wall 3 in plan view is provided. As shown in FIG. 2, the water stop wall 3 is constructed of concrete panels 4 having a width of 100 cm, a thickness of 45 cm, and a length of 8.7 m.

After the completion of the pier construction, the concrete panel 4 was pulled out using a drawing device 5 shown in FIGS. This device 5
Is provided with a vibratory hammer 6 suspended from a crawler crane (not shown) so as to be movable up and down, a bolt nut 7 for locking a wire rope at a lower portion, and a tie plate 8 for a chuck at an upper portion.
Protruding, the resonance part 10 chucked with a vibrator hammer pawl 9, the base end of which is fixed to the bolt and nut 7, and the tip end of which is formed by two locking holes 11 at the upper end of the concrete panel 4.
(The guide pipe of the PC rope is embedded.) The wire rope 13 is engaged with a bolt and nut 12 inserted therethrough.

In order to pull out the built-in concrete panel 4 constituting the water blocking wall 3 by using the pulling device 5, the vibratory hammer is lifted upward by a crawler crane and the oscillator 14 of the vibro hammer is moved. Resonant part 1
Transmit vibration to zero. The upward pulling force and vibration are transmitted to the concrete panel 4 via the wire rope 13, and the panel is pulled upward. Repeat panel 4
The water stop wall 3 was able to be removed without damaging the concrete panel.

[0012]

As described above, this drawing method transmits the vibration and the drawing force to the concrete through the wire rope, so that the vibration having a large amplitude oscillated by the oscillating device is generated by the elasticity of the wire rope. Sideways,
In addition, the impact force is absorbed and dispersed, and only the vertical micro-vibration at the time of pull-out can be effectively transmitted. Therefore, unlike the conventional drawing method for directly transmitting vibration, the concrete panel does not crack or break due to the impact force of the vibration having a large amplitude.

This drawing device can be easily installed by combining a general-purpose vibro hammer with a crawler crane or the like, does not require a reaction ground, and does not require an auxiliary crane for overturning work after drawing. In addition, vibration,
Low noise generation.

In the apparatus of the embodiment, the wire rope connecting the resonating portion and the concrete panel is locked by using a pin-structured attaching / detaching device, so that the attaching / detaching operation is made more efficient and safe.

[0015] The present invention is as described above. The installed panel can be pulled out efficiently and without damage, and the panel can be reused. Installation, movement,
It is easy and free to change, and does not require a reaction ground.
Workability and safety are improved. Vibration and noise are reduced, and work and environment can be improved.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are a longitudinal sectional view and a plan view of a pier construction targeted for an embodiment.

FIG. 2 is a plan view of a water stop wall having a built-in concrete panel.

FIG. 3 is a front view of the drawing device of the embodiment.

FIG. 4 is a side view showing a drawing device in which a concrete panel is locked in a partial cross section of a resonance portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Foundation, 2 ... Bridge pier, 3 ... Water stop wall, 4 ... Concrete panel, 5 ... Pull-out device, 6 ... Vibro hammer, 7 ... Locking bolt and nut, 8 ... Chuck steel plate, 9 ... Vibro hammer pawl, 10: resonance part, 11: locking hole, 12: bolt and nut, 13: wire rope, 14: oscillator.

Claims (2)

(57) [Claims] In a drawing method for pulling up a concrete panel built in the ground upward, a vibratory hammer is lifted by a crane, and the vibratory hammer is mounted on a concrete panel built in the ground. Connected with the locking part with a wire rope, transmitting the vibration of the vibro-hammer to the concrete panel via the wire rope, and simultaneously pulling out the concrete panel from the ground while pulling up the concrete panel with a crane. A concrete panel drawing method characterized by the following. 2. A vibratory hammer supported so as to be able to move up and down freely, a resonating portion gripped by the vibro-hammer and directly receiving vibration transmission, and a wire rope hanging down from the resonating portion to lock a concrete panel. A concrete panel drawing device, characterized in that: