JP2009108482A - Ground stabilization method for extraction of existing pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that the operation of pulling out an existing pile greatly involves risk because heavy machinery tends to fall due to a drilled hole and soft ground. <P>SOLUTION: A reinforcing cuboid box A and a wedge-shaped box B are arranged in the drilled hole. Since this prevents a collapse of the drilled hole and decentralizes pressure generated by the gravity of the heavy machinery, safe and rapid operations can be performed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ground stabilization method for stabilizing a heavy machine such as a drawing machine when pulling an existing pile.

The foundation pile that remains when the structure is removed usually has a pile head in the ground of about 1 to 1.5 m, and this is dug to reveal the pile head, and a pile puller is entered here to perform the pulling work. Start. However, such work sites are extremely rough due to water injection for pulling out piles and rubble after the building is removed. Since the pile heads are buried in the ground as described above, the ground is dug into an inverted trapezoidal shape during the pulling operation, and the slopes collapse during the pulling operation so that heavy machinery entering for pulling out is extremely inconsequential. It is stable, and there are accidents such as falls, which are always dangerous.
JP 2007-138544 A

  Although the existing piles that are buried depend on the site, concrete piles with a length of about 8 m and a diameter of about 30 to 45 cm are placed in one place. For this reason, a drawing casing corresponding to this length, a leader for supporting this vertically, and a drawing machine with a caterpillar for working (hereinafter referred to as a heavy machine) are required. In general, an iron plate is laid around the pile head of the existing pile while backfilling the soil when the pile is dug to stabilize the ground. However, due to the weight of the work equipment, the excavation hole collapses and the iron plate , The digging hole in the casing is tilted, and work is often interrupted to correct this, which not only delays construction work but also involves the risk of falling heavy machinery.

    The inventor has reached the construction method of the present invention as a result of intensive research on the stabilization of the ground that is a cause of such danger, and the present invention is for reinforcement at the center of the excavation hole. A rectangular box A is arranged, and a wedge-shaped box B is arranged on both sides so as to be integrated to fill the excavation hole, and the iron plate F is straddled across the hole excavated on the box A / B. The laying ground of the pile remover was formed by laying.

As shown in the figure, this formed approach ground has a square box A arranged in the center of the excavation hole (2), and a wedge-shaped box B is inserted into the side of the box A so that B, A, B By arranging them, the slope of the excavation hole (2) is brought into contact with the slope of the wedge-shaped box B. The arrows in FIG. 2 indicate the distribution of gravity applied to the excavation hole (2), the square box A, and the wedge-shaped block B. The force applied to the square box B is represented as S and the force R applied to the wedge-shaped block B. Is distributed and reduced.

  Therefore, even if the drawing machine D (only the caterpillar is shown in the drawing) enters on the iron plate F and the pile drawing work is performed, the inclined surface of the excavation hole (2) is pressed against the inclined surface of the wedge-shaped block B. Therefore, the iron plate F is also stable without being broken, and the safety of the pile cutting machine D is maintained.

  The present invention is a simple and inconspicuous operation, and is intended to safely and surely carry out the work of pulling existing piles, which is always dangerous, and is a combination of a square box A and a wedge-shaped block B structurally. Only by dispersing the force applied from the heavy equipment D, the ground can be stabilized, contributing to the speed of safety work, and the effect is extremely remarkable.

  The best mode for carrying out the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram showing an embodiment of the present invention when a pile is pulled out, and A is a pile puller (hereinafter referred to as a heavy machine). Move by caterpillar. This heavy machine D is constructed by standing a casing for pulling an existing pile and a leader for keeping the leader vertical. This drawing method is a method shown in the above-mentioned Patent Document 1, and is a method of a pile embedded by rotating a rotating blade that performs a soil removing action that operates by rotating an auger while inserting a casing into an existing pile. Let the blades enter while digging around. At this time, the vertical approach of the casing is maintained by an upright leader. Therefore, when the heavy machinery is tilted at this time, the upright casing is tilted, so that the excavation blades entering along the pile come into contact with the pile and the excavation of the pile becomes impossible. For this reason, not only is the pile pullout operation interrupted, but there are many accidents caused by the fall of heavy machinery.

  In order to reveal the pile head of the existing pile, the excavation hole (2) is formed in an inverted trapezoidal shape as shown in the figure, so that the inclined surface is easy to collapse, so even if the iron plate F is passed over the upper surface of the hole (2) When a heavy machine D with a load is placed, the slope collapses due to its weight. Therefore, in the present invention, a rectangular reinforcing box A and a wedge-shaped box B that supports the rectangular reinforcing box A are arranged in the excavation hole (2), and an iron plate F is laid over the excavation hole (2) on the heavy machine. The gravity applied to the steel plate F is distributed in the direction directly below the excavation hole (2) and the direction of the inclined surface, so that the iron plate F can be kept horizontal. For this reason, it was possible to prevent heavy machinery from tilting and to eliminate the tilt of the leader and casing, and to accelerate the work progress safely.

  FIG. 2 shows the relationship between the existing piles, the rectangular reinforcing box A and the wedge-shaped box B arranged in the excavation hole (2), the iron plate F passed to the upper surface, and the heavy machinery (only the caterpillar is shown) placed on this. . In addition, (3) in a figure has shown the reinforcing bar.

  FIG. 3 is a plan view showing the steel plate F to be laid at the work site and the exposed pile head of the existing pile, and a rectangular reinforcing box A1 is disposed at the tip of the rectangular reinforcing box A, The pull-out operation is facilitated, and a rectangular reinforcing box A2 is arranged in connection with the pull-out operation.

  FIG. 4 is a plan view showing the relationship between the reinforcing box bodies A and B and the existing piles, and is a partial detail view excluding the iron plate F of FIG. 4. The metal fittings are provided. FIG. 5 is a perspective view showing the entirety of the reinforcing box bodies A and B, where X is a rectangular reinforcing box A, Y is a perspective view of a wedge-shaped box B, and Z is a drilling hole in which B, A, and B are combined. The arrangement | positioning figure in (2) is shown.

  Examples of the method of the present invention will be described with reference to the accompanying drawings. Referring to FIGS. 3 and 4, the existing piles are five concrete piles, the diameter is 30 cm, and the length is 8 m. Is 1.5 m respectively. The pile head is exposed 1.5m underground. Therefore, the slot (2) is excavated so that the pile head is exposed. The pile drawing method used in the present invention uses the method shown in Patent Document 1. That is, a method is used in which a casing is made to dig around a pile by a spiral blade, and the pile is exposed and pulled out. The condition that the casing enters vertically along the pile is a condition for improving work efficiency.

  According to the ground stabilization method of the present invention, a rectangular reinforcing box A and wedge-shaped reinforcing boxes B are embedded and arranged integrally in an excavation hole (2) exposing a pile head of an existing pile. By laying the iron plate F across the excavation hole (2), the heavy machinery is used as a scaffold for the heavy machinery. The heavy machinery weight is inclined by the reinforcing box A via the iron plate F and the force S in the downward direction and the wedge-shaped box B. Dispersed in the direction force R. In particular, by inserting the wedge-shaped box B, the slope of the excavation hole (2) is pressed, which has the effect of preventing the collapse of the hole, and the tilt of the iron plate F is prevented.

  The size of the reinforcing box A2 used in the examples is 1250 m / m × 2300 m / m × 1250 m / m, the rectangular reinforcing box A1 is 1250 m / m × 2300 m / m × 1250 m / m, and the wedge-shaped box B is a square reinforcement. Combined as a height and width suitable for box A. Although not shown, a reinforcing beam and brace (3) are provided inside the reinforcing box. Further, the iron plate F passed to the excavation hole (2) is 22 m / m × 1500 m / m × 6000 m / m, and has a size that is sufficiently in time for the width 4 m of the caterpillar of the heavy machinery.

  As described above, the method of the present invention is a plain work of pulling out existing piles, but it can always be used safely because it can safely and quickly carry out work that involves danger, so it can contribute greatly to the development of the region. Sex is great.

Schematic diagram of the method of the present invention Sectional drawing of the excavation hole which is the principal part of this invention Plan view including iron plate of drilling hole Top view of drilling hole upper part Perspective view and combination side view of reinforcement box

Explanation of symbols

2 ... Drilling hole
A ... Rectangular reinforcement box
B ... Wedge shaped reinforcement box
F ... Iron plate
D ... Pile removal machine

Claims (3)

  A square reinforcing box A is arranged at the center of the excavated hole to reveal the pile head of the existing pile, and wedge-shaped boxes B are inserted and arranged on both sides of the box A to be integrated. A ground stabilization method at the time of pulling an existing pile, characterized in that an iron plate is laid on both the boxes A and B across the excavation hole to serve as an entrance scaffold for the pile puller D.   The ground stabilization at the time of pulling out the existing pile according to claim 1, wherein the rectangular reinforcing box A uses a rectangular box A1 at the forefront and a square box A2 behind the rectangular box A1. Chemical method. 2. The ground stabilization method for pulling an existing pile according to claim 1, wherein the reinforcing boxes A and B are reinforced by providing a brace or the like inside the constituting box.

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