JP4366597B2 - Cutting and removing existing piles - Google Patents

Description

The present invention relates to cutting and withdrawal Sakata methods existing pile driven into the ground.

  In general, when rebuilding an existing building, it is necessary to pull out and remove the existing pile that supported the building as well as dismantling it.

As a conventional method of pulling out existing piles, (A) Vibrating the vibro casing lifted by the crane while penetrating it around the existing piles and cutting the frictional force between the existing piles and the ground, A method of chucking an existing pile with a chucking device provided in the vibro casing, lifting the existing pile with a vibrator casing with a crane, and pulling it out. (B) While rotating the auger casing with a bit attached to the tip, around the existing pile A method is known in which the auger casing is removed from the periphery of the existing pile after the friction between the existing pile and the ground is cut, and then the existing pile is pulled out by a crane.
JP-A-8-165649

  In the conventional method of (A) above, since a vibratory hammer is used as a vibrator for a vibratory casing, there is a problem of environmental pollution due to the noise and vibration, and the existing pile is lifted by a crane together with a heavy vibratory casing and pulled out. In addition, a large crane with high lifting gravity is required, and an increase in construction cost is inevitable.

  In the conventional method of (B) above, since the existing pile is pulled out after the auger casing is removed from the periphery of the existing pile, the surrounding ground collapses in the gap formed around the existing pile after the auger casing is removed. As a result, there is a problem that the frictional resistance of the existing piles may increase, resulting in a situation where it cannot be pulled out as it is.

The inventor of the present application has solved this problem by the following means as a result of intensive studies in view of the above.
(1) a casing drilling around the existing pile while rotating has a larger inner diameter than the outer diameter of the already設杭, one end of which is secured to the lower inner wall of the casing, and the lower inner wall surface of the casing from the one end The wire saw that has been stretched horizontally along the inner wall surface while being temporarily fixed in place, and then the wire saw that has been redirected upward through the direction transforming means and the wire saw that has been redirected upwardly are pulled upward. In the existing pile cutting / removal method using the existing pile cutting / removal device equipped with a wire saw lifting means ,
When the casing of the existing pile cutting / removal device is disposed so as to surround the existing pile, the first step of excavating the periphery of the existing pile while rotating the casing, and when the casing reaches a predetermined depth In addition, the second step of cutting the existing pile by pressing the wire saw surface against the trunk of the existing pile by pulling up the end of the wire saw that has been redirected upward while rotating the casing. And a third step of lifting the existing pile of the cut portion to the ground while holding it inside the casing, a fourth step of removing the cut portion of the raised existing pile from the casing, and a cutting portion of the existing pile. The removed casing is again arranged so as to surround the existing pile left in the ground, and the existing pile is cut into a plurality of pieces by repeating the first step to the fourth step and removed. Cutting and removing method of the existing pile, characterized in that that.

(2) The method for cutting and removing an existing pile according to (1) above, wherein the wire saw pulling means uses a hydraulic jack.
(3) The method for cutting and removing an existing pile according to (1) above, wherein the means for lifting the wire saw uses an electric winch.

(4) The casing is provided with a vertical cutting blade and a high-pressure water injection nozzle at the lower end, and cutting and removing the existing pile according to any one of (1) to (3) above Way .
(5) The method for cutting / removing an existing pile according to any one of (1) to (4), wherein the casing is configured to be separable into an upper part and a lower part.

According to the present invention, the following effects are exhibited.
According to the cutting-withdrawal Sakata methods existing pile to be (a) the present invention, only by using the rotation of the casing for pressing the wire saw to the body portion of the existing pile, having a simple configuration that can be cut, Since noise and vibration are reduced and there is no environmental pollution problem, existing piles can be cut short, pulled out and removed little by little, so that it is possible to work in confined spaces between forested urban buildings. In addition, since a large amount of lifting gravity is not required for the work of pulling out the cut portion of the existing pile, the work can be performed with a small puller and the cost can be reduced.

(A) Since the casing according to the present invention is inserted around and pulled out around the existing pile, the occurrence of noise and vibration is small, and there is no problem of environmental pollution.

  (C) Since a wire saw is used to cut the existing pile, even if the casing is slightly eccentric from the central axis of the existing pile, if the wire saw is lifted upward by the wire saw lifting means, the wire saw is removed from the existing pile. It is surely press-fitted to the body of the machine and cutting work can be carried out accurately and easily.

  (D) Since the existing pile can be cut short and removed, if only the upper part of the existing pile is cut and removed to leave the lower part, the remaining part of the existing pile will help to maintain stable ground and prevent unnecessary groundwater drainage. In addition, the reduction of waste materials and the cost of processing waste materials can be achieved, which contributes to shortening the construction period. In addition, the amount of landfill such as earth and sand after the removal of existing piles can be reduced, reducing costs and shortening the construction period.

Embodiments of the present invention will be described with reference to the drawings of the examples.
Figure 1 is an explanatory view of a cutting principle of the exemplary structure illustration of the cutting and removal equipment of the existing pile used in example 2 is cut and removed device of the existing pile of the present invention of the present invention, FIG. 3 the first step illustration of cutting and removing method previously設杭of the present invention, FIG 4 is a second process explanatory view of the existing pile cutting and removing method, FIG 5 is the third step of the existing pile cutting and removing method And 4th process explanatory drawing, FIG. 6 is explanatory drawing of the process of cutting and removing the remaining existing pile.
In the figure, 1 is an existing pile cutting / removal device, 2 is an existing pile, 3 is a casing, 3a is a fixing portion, 3b is a drawer hole, 4a and 4b are rollers, 5 is a lifting means, 6 is a wire saw, 6a and 6b Is an end of the wire saw, 7 is a cutting blade, and 8 is a protective cover. Further, 11 is a pile remover, 12 is a leader, 13 is a rotary elevator, 14 is a connecting machine, 15 is a telescopic rod, 16 is a fixed base, and 17 is a drawing wire and hook.

As shown in FIG. 1, the existing pile cutting / removal device 1 according to the present invention has a cylindrical casing 3 having an inner diameter larger than the outer diameter of the existing pile 2 and excavating the periphery of the existing pile 2 while rotating. The wire saw 6, that is, the wire saw end 6 a side is fixed to the fixing portion 3 a of the lower inner wall surface of the casing 3 and is temporarily fixed to the lower inner wall surface of the casing 3 from the end portion 6 a side of the wire saw. After extending horizontally along the inner wall surface, it is drawn out of the casing 3 through a drawing hole 3b drilled in the casing 3, and further upwards through a direction changing means comprising two rollers 4a and 4b. A converted wire saw 6 [see FIG. 2 (a)] and a lifting means 5 for pulling up the end 6b of the wire saw on the side of the wire saw 6 whose direction has been changed. Wherein the lower end of the casing 3 and a vertical direction of the cutting blade 7 and the high pressure water injection nozzles (not shown) for drilling a periphery of the existing pile 2.
The wire saw 6 of this example is formed by fixing a number of cemented carbide blades 60 made of tungsten alloy or the like at small intervals on the peripheral surface of a steel stranded wire 61 obtained by twisting a plurality of steel wires.
The lifting means 5 includes a hydraulic jack and an electric winch.
Further, the existing pile cutting / removal device 1 supplies a high-pressure water flow to a hydraulic pipe (in the case of a hydraulic jack) or a power line (in the case of an electric winch) as a power supply source of the lifting means 5 and a high-pressure water injection nozzle. A hose is attached.

Cutting and removal device 1 of the engagement Ru existing pile of the present invention, as shown in FIG. 3, telescopic rod connected via a coupling device 14 to the rotary elevator 13 for elevating along the reader 12, such as a pile driver 11 15 is used with the upper end of the casing 3 connected thereto.
In order to cut and remove the existing pile 2 using the existing pile cutting / removing device 1, first, the lower end opening of the casing 3 can be lowered over the existing pile 2 and surrounding the existing pile 2. Install in position (Figure 3).
Then, as shown in FIG. 4, the rotary elevator 13 is rotated along the leader 12 while being rotated, and the water flow injected from the vertical cutting blade 7 at the lower end of the casing 3 and the high-pressure water injection nozzle (not shown) Is excavated around the existing pile 2 and the casing 3 is lowered to a predetermined depth (first step).

  When the casing 3 reaches a predetermined depth, the end portion 6b of the wire saw on the side whose direction has been changed to the upper side of the wire saw 6 is pulled upward while rotating the casing 3, so that the inside of the lower portion of the casing 3 is raised. Unfastening the wire saw 6 temporarily fixed (for example, hooking a thin wire to a protrusion projecting on the wall and tying a wire saw with the thin wire) on the wall surface, The existing pile 3 is cut by pressing the surface of the wire saw 6 against the trunk (second step).

The states of the wire saw 6 and the existing pile 3 in the first step and the second step are shown in FIG. 2 as cross-sectional views at respective points in the cutting position as explanatory diagrams of the cutting principle.
FIG. 2A shows a state in which the casing 3 is excavating around the existing pile (first step), and the wire saw 6 is temporarily fixed along the inner wall of the casing 3. There is no contact.
FIG. 2 (b) shows a case where the casing 3 is lowered to a predetermined depth, and the end 6b of the wire saw 6 is pulled upward by a lifting means (hydraulic cylinder) 5 connected to the end 6b. 6 shows the start state of the second step in which 6 is pulled through the rollers 4a and 4b, the temporary fixing to the inner wall of the casing 3 is released, and the surface of the wire saw 6 is pressed against the trunk of the existing pile 2 .
FIG. 2 (c) shows a state in the middle of the second step in which the existing pile 2 to which the wire saw 6 is pressed is cut while the casing 3 is rotated and the end 6b of the wire saw 6 is pulled upward. Indicates the state. The part indicated by 2 ′ in FIG. 2 (c) is the surface of the already cut part of the existing pile 3.

A part of the existing pile 3 separated by the wire saw 6 is held inside the casing 3 and pulled up to the ground. At this time, since the wire saw obtained by cutting the existing pile 2 in the third step is positioned on a part of the lower surface of the existing pile 2, the casing 3 is shown in FIG. If the casing 3 is raised by the rotary elevator 13, the casing 3 is pulled up to the ground while holding a part of the existing pile 1 cut inside.
And it fixes with the wedge-shaped fixing stand 16 so that the lower part of the pulled-up casing 3 may not sink into the space | gap around the existing pile 3 excavated (3rd process).

  Next, as shown in FIG. 6, as the fourth step, the upper and lower portions of the casing 3 are separated, and the upper portion is once pulled upward by the rotary elevator 13 and held in the lower portion of the casing 3 by the drawing wire and the hook 17. Pull out the cut part of the pile 2 and remove it.

  After the first upper end portion of the existing pile 2 is cut and removed by the first to fourth steps as described above, the upper and lower portions of the casing 3 are connected again, and the telescopic rod 15 is further extended, for example, by one step. In the same manner as in the first step described above, the rotary elevator 13 is rotated along the leader 12 so that the upper end of the casing 3 can be cut around the remainder of the existing pile 2 driven into the ground. After that, the work is proceeded according to the second to fourth steps described above, and the remaining upper end portion of the existing pile is removed.

  Furthermore, if there is still the remaining of the existing pile 2, the rod of the telescopic rod 15 is extended one after another, and the existing pile 2 is completely removed by repeating the first step to the fourth step.

  According to the present invention, since the existing pile is cut in the ground, the existing pile can be cut and removed little by little without causing environmental pollution problems with low noise and low vibration. It is easy to work even in confined spaces, and it has great utility in the construction industry.

Structure illustration of the cutting and removal equipment of the existing pile used in embodiments of the present invention Explanatory drawing of the cutting principle of the cutting and removal apparatus of the existing pile which concerns on this invention Explanatory drawing of the 1st process of the existing pile cutting and removal method which concerns on this invention Explanatory drawing of the 2nd process of the cutting and removal method of the existing pile Explanatory drawing of the 3rd process of the cutting and removal method of the existing pile, and the 4th process Explanatory drawing of the process of cutting and removing the remaining existing piles

Explanation of symbols

1: Cutting / removal device for existing pile 2: Existing pile 3: Casing 3a: Adhering portion 3b: Pull-out hole 4a, 4b: Roller 5: Lifting means (hydraulic cylinder)
6: Wire saw 6a, 6b: End of wire saw 7: Cutting blade 8: Protective cover 11: Pile puller 12: Leader 13: Rotating elevator 14: Coupling machine 15: Telescopic rod 16: Fixing base 17: Pulling wire And hooks

Claims (5)

A casing drilling around the existing pile while rotating has a larger inner diameter than the outer diameter of the already設杭, one end of which is secured to the lower inner wall of the casing, and in some places the lower inner wall surface of the casing from the one end A wire saw that is stretched horizontally along the inner wall surface while being temporarily fixed and then redirected upward through a direction transforming means, and a wire saw that lifts the wire saw that has been redirected upward. In an existing pile cutting / removal method using an existing pile cutting / removal device with means ,
When the casing of the existing pile cutting / removal device is disposed so as to surround the existing pile, the first step of excavating the periphery of the existing pile while rotating the casing, and when the casing reaches a predetermined depth In addition, the second step of cutting the existing pile by pressing the wire saw surface against the trunk of the existing pile by pulling up the end of the wire saw that has been redirected upward while rotating the casing. And a third step of lifting the existing pile of the cut portion to the ground while holding it inside the casing, a fourth step of removing the cut portion of the raised existing pile from the casing, and a cutting portion of the existing pile. The removed casing is again arranged so as to surround the existing pile left in the ground, and the existing pile is cut into a plurality of pieces by repeating the first step to the fourth step and removed. Cutting and removing method of the existing pile, characterized in that that. The method for cutting and removing an existing pile according to claim 1, wherein the wire saw pulling means uses a hydraulic jack. The method for cutting and removing an existing pile according to claim 1, wherein the wire saw pulling means uses an electric winch. The method for cutting and removing an existing pile according to any one of claims 1 to 3, wherein the casing includes a vertical cutting blade and a high-pressure water injection nozzle at a lower end. The said casing is comprised so that separation | separation into the upper part and the lower part is possible, The cutting and removal method of the existing pile of any one of Claims 1-4 characterized by the above-mentioned.

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