JP2009287326A - Pulling out method of existing pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulling out method of an existing pile which makes possible pulling out of the existing pile with a simple facility at low cost and which is excellent in practicality. <P>SOLUTION: In the pulling out method of the existing pile, part of or the whole of the existing pile is buried in the ground 1. One or a plurality of bore holes 4 are bored in the existing pile 2 along its axial direction by a rod 3 for cutting while issuing a fluid from the rod 3 for cutting on the ground 1 surrounding the existing pile 2 and softening the ground 1 surrounding the rod 3 for cutting. After that, a filler is charged from the rod 3 for cutting while pulling the rod 3 for cutting out of the bore hole 4. The filler is used for controlling the tightening and hardening of the softened ground 8 surrounding the rod 3 for cutting. Then the soil pressure which the existing pile 2 receives from the ground 1 is reduced, and the existing pile 2 is pulled out of the ground 1 in this sate of reduced soil pressure. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for extracting an existing pile.

  As a method of pulling out an existing pile partially or wholly embedded in the ground, for example, as disclosed in Patent Document 1, a pipe having a diameter slightly larger than that of an existing pile is driven and embedded so as to surround the existing pile. A method is known in which a pile is lifted with a crane while cutting the pile and the surrounding ground (cutting the peripheral frictional force of the existing pile) to reduce the earth pressure applied to the existing pile.

JP 2001-303570 A

  However, when performing the above method, it requires a large and heavy pipe having a diameter larger than that of the existing pile, and of course, the crane and driving device for transporting and driving this are also large and very expensive. Since it is necessary to secure a wide working space above when the pipe body is driven or pulled up, the construction is troublesome when, for example, an overhead wire exists above the existing pile. In addition, it is troublesome to construct in places such as rivers where the scaffolding is poor and it is difficult to place a large device.

  In addition, a method of cutting and forming an annular edge hole that surrounds the entire circumference of an existing pile without using a pipe body can be considered, but cutting and forming such an edge hole is extremely time consuming and laborious. It is troublesome.

  The present invention has been made in view of the above situation, and it is not necessary to use a pipe having a diameter larger than that of an existing pile as in the prior art, and it is also necessary to form an edge cutting hole that surrounds the entire circumference of the existing pile. In addition, the present invention provides a method for pulling out an existing pile that is excellent in practicality, and can be used to pull out an existing pile at a low cost with simple equipment.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A method for extracting an existing pile partially or wholly embedded in the ground 1, wherein a fluid is ejected from the cutting rod 3 to the ground 1 around the existing pile 2 and the ground around the cutting rod 3 1 or a plurality of boring holes 4 are drilled along the axial direction of the existing pile 2 while the cutting rod 3 is softened, and then the cutting rod 3 is pulled out of the boring hole 4 and cut. The rod 3 is filled with a filler that suppresses the compaction of the softened ground 8 around the cutting rod 3 to reduce the earth pressure that the existing pile 2 receives from the ground 1. The present invention relates to a method for extracting an existing pile, wherein the existing pile 2 is extracted from the ground 1.

  Moreover, the drawing method of the existing pile of Claim 1 WHEREIN: The said rod 3 for cutting is introduce | transduced into the said ground 1 so that the ground 1 which contact | connects the outer peripheral surface of the said existing pile 2 may be softened. This relates to the drawing method.

  Moreover, in the extraction method of the existing pile of any one of Claims 1, 2, the kind or quantity of the said filler is adjusted, and the compaction suppression time of the said softened ground 8 is set, It is characterized by the above-mentioned. This relates to the method of pulling out existing piles.

  Moreover, the extraction method of the existing pile of Claim 3 is based on the extraction method of the existing pile characterized by the said thickener being contained in the said filler.

  Moreover, in the extraction method of the existing pile according to any one of claims 1 to 4, a plurality of the boring holes 4 are independently drilled at positions away from the existing pile 2 so as to surround the existing pile 2. The present invention relates to a method for pulling out an existing pile.

  Moreover, in the extraction method of the existing pile of any one of Claims 1-5, the said existing pile 2 is a bottomless cylindrical shape, and when this existing pile 2 is extracted, the inner peripheral side of this existing pile 2 is provided. The boring hole 4 is drilled in the ground 1 and relates to a method for pulling out an existing pile.

  Moreover, in the extraction method of the existing pile of any one of Claims 1-6, when drilling the said several boring hole 4, each said boring hole 4 is sequentially used using the same said rod 3 for cutting. The present invention relates to a method for pulling out an existing pile characterized by drilling.

  Moreover, in the extraction method of the existing pile of any one of Claims 1-7, while attaching and fixing the jig 6 which has the downward jack receiving surface 5 to the exposed part exposed from the said ground 1 of the said existing pile 2 A push-up jack 7 is arranged opposite to the jack receiving surface 5, and the existing pile 2 is lifted and pulled out by pushing up the jack receiving surface 5 of the jig 6 by the push-up jack 7. This relates to the drawing method.

  Since the present invention is as described above, it is not necessary to use a pipe having a diameter larger than that of an existing pile as in the prior art, and it is not necessary to form an edge cutting hole that surrounds the entire circumference of the existing pile. Therefore, the existing pile can be pulled out at a very low cost.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  By drilling a boring hole 4 in the ground 1 around the existing pile 2, the existing pile 2 and the surrounding ground 1 are cut by this boring hole 4 (cutting the peripheral frictional force of the existing pile 2 ) The earth pressure of the ground 1 for fastening the existing pile 2 can be released (reduced), and thus the existing pile 2 can be pulled out satisfactorily.

  Further, since the edge cutting is performed by drilling the boring hole 4 with the cutting rod 3, it is not necessary to drive a large tube surrounding the existing pile 2 as in the prior art, and a large tube for driving a large and heavy tube. No need for a driving device or the like, and it is only necessary to use a general boring device capable of introducing a rotational drop of the small-diameter cutting rod 3, which is extremely cost-effective.

  Moreover, since the cutting rod 3 can be added at a short interval, such as every 1 m, and the introduction length can be adjusted, it is not necessary to secure a wide working space above, so even if there is an overhead wire in the sky Good construction is possible.

  Further, by cutting the boring hole 4 while jetting a fluid such as water from the cutting rod 3 and softening the ground 1 around the cutting rod 3, the edge can be cut more efficiently. The earth pressure can be reduced efficiently.

  Further, when the cutting rod 3 is pulled out from the boring hole 4, a filling material that suppresses the compaction of the softened ground 8 is filled, so that the boring hole and the softening after the cutting rod 3 is pulled out from the boring hole 4 are filled. The ground 8 can be prevented from being compacted, and the earth pressure can be reduced well even when a plurality of boring holes 4 are formed.

  Furthermore, the earth pressure can be further reduced by perforating a plurality of boring holes 4 at positions apart from the existing pile 2 so as to surround the existing pile 2. Further, at this time, since the boring holes 4 are formed independently without being continuously provided, the edge cutting operation is simpler than that in the case of forming an annular edge cutting hole surrounding the entire circumference of the existing pile 2. Become.

  Specific embodiments of the present invention will be described with reference to the drawings.

  The present embodiment is a method for extracting an existing pile partially or entirely embedded in the ground 1 as shown in FIG. 1, and the fluid is applied to the ground 1 around the existing pile 2 from the cutting rod 3. One or a plurality of boring holes 4 are drilled along the axial direction of the existing pile 2 with the cutting rod 3 while softening the ground 1 around the cutting rod 3, and then the cutting rod The earth pressure that the existing pile 2 receives from the ground 1 is filled with a filler that suppresses the compaction of the softened ground 8 around the cutting rod 3 from the cutting rod 3 while pulling out the 3 from the boring hole 4. The existing pile 2 is pulled out from the ground 1 in a state where the earth pressure is reduced.

  In the present embodiment, a plurality of boring holes 4 are drilled in the ground 1 around the existing bottomless cylindrical pile 2 in which a part of the distal end portion (exposed portion) is left in the ground 1 and the remaining base end side is embedded. The case where it installs and pulls out this existing pile 2 is demonstrated.

  In this embodiment, a boring hole 4 is drilled while softening the ground 1 around the cutting rod 3 by jetting a fluid (water) together with compressed air from the tip of the cutting rod 3. At this time, the water jet injection range and the drilling position of the boring hole 4 are set so that the ground 1 in contact with the outer peripheral surface of the existing pile 2 is softened. Specifically, in order to soften the ground around the existing pile 2 according to the number of bores, the soil quality of the ground 1, the diameter of the existing pile 2, the injection amount of the fluid, the injection strength, etc. The range and the drilling position of the boring hole 4 (distance from the existing pile 2) are set as appropriate.

  In the present embodiment, the boring hole 4 is drilled while spraying water so that the ground 1 in contact with the outer peripheral surface of the existing pile 2 is softened as described above. It is possible to release the earth pressure by softening the surrounding ground 1 without softening the ground 1 in contact therewith, and therefore the water 1 is not so softened that the ground 1 in contact with the outer peripheral surface of the existing pile 2 is softened. The injection range of the fluid and the drilling position of the boring hole 4 may be set so that the ground 8 softened by the above and the outer peripheral surface of the existing pile 2 do not contact each other.

  In addition, the present embodiment can cope with any soil quality such as sandy soil, gravel soil, viscous soil, or silty soil, but depending on the soil quality, either water or air is applied from the tip of the cutting rod 3. You may make it inject. Moreover, as the rod 3 for cutting, what has the same diameter from a front end to a base end may be employ | adopted, and what has a large diameter only a front-end | tip part (cutting part) may be employ | adopted.

  Further, after the boring hole 4 is drilled, the boring hole 4 and the softened ground 8 around the boring hole 4 are not tightened for a while (softening). -Filling with a filler (thickener added to bentonite or mud) containing a thickener that suppresses (delays) this compaction so as to maintain a fluidized state. Specifically, the cutting rod 3 is introduced while jetting water and air from the tip when the descent is introduced into the natural ground, and the filler is inserted from the tip when the boring hole 4 is drilled and led out. It is comprised so that it may derive | lead-out, discharging. As the thickener, carboxymethyl cellulose, a polymeric colloidal organic substance (trade name Lester), or the like can be appropriately employed as long as it can prevent the pore wall from collapsing and hardly adversely affect the environment. Moreover, the compaction suppression time can be adjusted by adjusting the type of filler and the amount of filler injected.

  By injecting the filler, it is possible to prevent the boring holes 4 and the softened ground 8 from being rapidly tightened. For example, when it is necessary to drill a plurality of boring holes 4, it takes time from drilling to pulling out. Even if necessary, the existing pile 2 can be pulled out satisfactorily.

  Moreover, when pulling out the existing bottomless cylindrical pile 2 in which earth and sand enter, after drilling the bore hole 4 in the ground 1 on the inner peripheral side of the existing pile 2 and removing the inner earth and sand When this existing pile 2 is pulled out, the existing pile 2 becomes lighter and becomes easier to pull out. At this time, similarly to the boring hole 4 drilled on the outside of the existing pile 2, the cutting rod 3 may be cut while ejecting the fluid, or the fluid may be cut without being ejected.

  The boring device 9 for introducing the cutting rod 3 according to the present embodiment is a general one having a holding portion 10 for holding the cutting rod 3 so as to be rotatable and movable up and down as shown in FIG. In the figure, reference numeral 11 denotes a guide portion for guiding the introduction and removal of the cutting rod 3. Moreover, the cutting rod 3 has a smaller diameter than the existing pile 2 and is configured to soften the ground 1 in a larger diameter range than the existing pile 2 by jetting fluid.

  In addition, the holding unit 10 of the boring device 9 of the present embodiment is provided with a display unit for displaying the introduction length of the cutting rod 3 that has been lowered and introduced. It is possible to grasp the introduction length of the cutting rod 3 that is somewhat accurate. Therefore, for example, when the burial length of the existing pile 2 is unknown, the boring hole 4 is drilled around the inside of the existing pile 2 as described above to check the fluid blow-up condition, etc. It becomes possible to grasp the burying length of the existing pile 2 to some extent.

  The cutting rod 3 is internally provided with a hose for injecting fluid and discharging a filler, and a tank 12 in which water and filler are partitioned and stored at the base end side of the hose is for delivery. An air pump 14 is provided continuously through the pump 13 and sends compressed air. In the figure, reference numeral 16 denotes a continuous portion that connects a hose built in the cutting rod 3, a flow portion 17 through which water or filler flows and a flow portion 18 through which air flows.

  Accordingly, by feeding water and compressed air to the hose and jetting water in a conical shape (fan shape in cross section), the cutting rod 3 is lowered and introduced, so that the surroundings of the boring hole 4 (the surroundings of the cutting rod 3). ) While softening the ground 1, the boring hole 4 is formed in the ground 1, and then the cutting rod 3 is lifted and led out while feeding the filler to the hose and discharging the filler. It becomes possible to inject the filler into the softened ground 8. The tank is configured so that the delivery of water or filler to the cutting rod 3 can be switched by a valve, but only water is stored in one tank when the cutting rod 3 is lowered, and when the rise is derived. Only the filler may be stored.

  In the present embodiment, specifically, the existing pile 2 is pulled out by the following procedure.

  A boring device 9 is installed above the existing pile 2, and the ground rod 1 that is in contact with the outer peripheral surface of the existing pile 2 can be softened by introducing the descent into the ground 1 while rotating the cutting rod 3 by the boring device 9. In addition, the water is jetted into a predetermined circular range, and a boring hole 4 is drilled in the vicinity of the existing pile 2 along the axial direction of the existing pile 2.

  Subsequently, the cutting rod 3 is introduced to a predetermined depth position (substantially the same position as the lower end position of the existing pile 2), and a boring hole 4 having a depth substantially the same as the embedded length of the existing pile 2 is drilled, and then cutting is performed. The softened ground 8 is filled with a filler so that the softened ground 8 is hard to be compacted while the rod 3 is pulled out.

  Then, the boring hole 4 is formed in the opposing position which pinched the existing pile 2 using the same cutting rod 3 in the same procedure. Specifically, as shown in FIG. 2, a circular boring hole 4 is drilled with two cutting rods 3 at two positions facing each other at an interval of 180 degrees across the existing pile 2, so that the existing pile 2 and the surrounding The ground pressure of the ground 1 that clamps the existing pile 2 is released (reduced) by cutting off the ground 1 (cutting the peripheral frictional force of the existing pile 2). At this time, it is preferable to set the water injection degree and the boring position so that the end portions (water injection outer edge portions) of the softened ground 8 overlap each other.

  In addition, when drilling the boring hole 4, if it is recognized that the earth pressure from the surroundings can be sufficiently reduced by moving the existing pile 2 by the first or second, When the lifting work is started and it is recognized that the earth pressure is still not sufficiently reduced, the bore holes 4 are formed in the other positions in the same manner. That is, for example, when it is difficult to pull out the existing pile 2 only by drilling the boring holes 4 at two points at the opposing positions, for example, the boring holes 4 are formed at four points around the existing pile 2 at intervals of 90 degrees. Further, as shown in FIG. 3, bore holes 4 are similarly drilled at six points at intervals of 60 degrees so as to cover the entire circumference of the existing pile 2. Therefore, in this embodiment, the number of the bore holes 4 can be easily changed according to the situation at the site, so that the workability is very excellent. That is, in this embodiment, while confirming the ease of pulling out the existing pile 2 while drilling the boring holes 4, additional drilling holes 4 can be drilled while watching the situation on the site or less than the planned number of drilling Therefore, it can be adjusted as appropriate, so that the technique is extremely easy to handle.

  Subsequently, a boring hole 4 is also drilled in the ground 1 inside the existing pile 2 by drilling a boring hole 4 in the same way using the same cutting rod 3 inside the existing pile 2. . In addition, the order at the time of drilling the boring hole 4 in the outer side and the inner side of the existing pile 2 may be first. Alternatively, the plurality of boring holes 4 may be simultaneously drilled using the plurality of cutting rods 3 without sequentially drilling the plurality of boring holes 4 using the same cutting rod 3.

  Subsequently, a jig 6 having a downward jack receiving surface 5 is attached and fixed to the exposed end portion (exposed portion) of the existing pile 2 with a bolt or the like, and a push-up jack 7 is disposed opposite to the jack receiving surface 5. Then, by pushing up the jack receiving surface 5 and pushing it up by the jack 7, the existing pile 2 is pulled up and pulled out little by little from the ground 1, and when the exposed part reaches a certain length, the surplus part 2 ′ is left leaving the part where the jig 6 is provided. The existing pile 2 is pulled out while appropriately cutting and removing. In the figure, reference numeral 15 denotes a jack installation scaffold. When the existing pile 2 is pulled out, if there is no overhead wire in the sky, other means such as pulling out using a crane, a pillar, a three-point pile driving machine, etc. may be adopted.

  Subsequently, earth and sand are backfilled in the gap formed by pulling out the existing pile 2, and the operation is completed. In addition, you may fill not only with a backfill but fillers, such as mortar.

  Further, in this embodiment, even if the existing pile 2 has a large diameter, a cutting rod 3 having a small diameter and a light weight of about several centimeters to 10 centimeters can sufficiently respond (the number of bore holes and the amount of water injection). It is possible to adjust the degree of edge cutting as needed by adjusting on-site, etc.), and it is not necessary to embed a large-diameter pipe larger than the existing pile 2 as in the past, and the boring hole 4 can be drilled with a general boring device. The existing pile 2 can be pulled out at a very low cost.

  In addition, in the present Example, although the case of a bottomless cylindrical body is demonstrated as above-mentioned as the existing pile 2, for example, the existing pile 2 of other structures, such as a bottomed cylindrical body and a rod-shaped body, is also known (existing pile). 2) (except for whether or not the boring hole 4 is formed inside 2).

  Since the present embodiment is as described above, by drilling the borehole 4 in the ground 1 around the existing pile 2, the existing pile 2 and the surrounding ground 1 are cut off by this borehole 4 (existing It is possible to release (reduce) the earth pressure of the ground 1 that tightens the existing pile 2 by cutting the peripheral frictional force of the pile 2, and thus the existing pile 2 can be pulled out satisfactorily.

  Further, since the edge cutting is performed by drilling the boring hole 4 with the cutting rod 3, it is not necessary to drive a large tube surrounding the existing pile 2 as in the prior art, and a large tube for driving a large and heavy tube. No need for a driving device or the like, and it is only necessary to use a general boring device capable of introducing a rotational drop of the small-diameter cutting rod 3, which is extremely cost-effective.

  Moreover, since the cutting rod 3 can be added at a short interval, such as every 1 m, and the introduction length can be adjusted, it is not necessary to secure a wide working space above, so even if there is an overhead wire in the sky Good construction is possible.

  Further, by cutting the boring hole 4 while jetting a fluid such as water from the cutting rod 3 and softening (fluidizing) the ground 1 around the cutting rod 3, the edging can be performed more efficiently. Can reduce the earth pressure more efficiently.

  Further, when the cutting rod 3 is pulled out from the boring hole 4, the boring hole is tightened even after the cutting rod 3 is pulled out from the boring hole 4 by filling with a filler that suppresses the compaction of the softened ground 8. Hardening can be prevented, and even when a plurality of boring holes 4 are formed, the earth pressure can be reduced well.

  Furthermore, the earth pressure can be further reduced by perforating a plurality of boring holes 4 at positions apart from the existing pile 2 so as to surround the existing pile 2. Further, at this time, since the boring holes 4 are formed independently without being continuously provided, the edge cutting operation is simpler than that in the case of forming an annular edge cutting hole surrounding the entire circumference of the existing pile 2. Become.

  In addition, when drilling the boring holes 4, it is not necessary to drill the boring holes 4 so that they are in contact with each other. Even if compared with the method of forming, the earth pressure applied to the existing pile 2 can be reduced very easily and the drawing can be facilitated.

  Therefore, the present embodiment does not require the use of a pipe having a diameter larger than that of the existing pile 2 as in the prior art, and does not require the formation of edge cutting holes that surround the entire circumference of the existing pile 2. Therefore, the existing pile 2 can be pulled out at a low cost, and the existing pile can be pulled out with excellent practicality.

It is a schematic explanatory drawing of a present Example. It is a schematic explanatory plan view of a present Example. It is a schematic explanatory plan view of another example. It is a schematic explanatory side view of a present Example. It is a schematic explanatory side view of a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground 2 Existing pile 3 Cutting rod 4 Boring hole 5 Jack receiving surface 6 Jig 7 Jack 8 Softened ground

Claims (8)

  A method for extracting an existing pile partially or wholly embedded in the ground, wherein the ground around the existing pile is ejected with fluid from the cutting rod to soften the ground around the cutting rod. After drilling one or more boring holes along the axial direction of the existing pile with a cutting rod, the cutting rod is pulled out from the boring hole and softened around the cutting rod from the cutting rod. Pulling out an existing pile filled with a filler that suppresses compaction of the ground, reducing the earth pressure that the existing pile receives from the ground, and pulling out the existing pile from the ground in a state in which the earth pressure is reduced Method.   2. The method for extracting an existing pile according to claim 1, wherein the cutting rod is introduced into the ground so that the ground in contact with the outer peripheral surface of the existing pile is softened.   In the extraction method of the existing pile of any one of Claims 1 and 2, the kind or amount of the filler is adjusted, and the compaction suppression time of the softened ground is set. Drawing method.   The extraction method of the existing pile of Claim 3 WHEREIN: The thickener is contained in the said filler, The extraction method of the existing pile characterized by the above-mentioned.   In the extraction method of the existing pile according to any one of claims 1 to 4, a plurality of the boring holes are independently drilled at positions apart from the existing pile so as to surround the existing pile. Pulling out existing piles.   In the extraction method of the existing pile of any one of Claims 1-5, the said existing pile is a bottomless cylindrical shape, When pulling out this existing pile, the said boring is carried out to the said ground on the inner peripheral side of this existing pile. A method of pulling out an existing pile characterized by drilling a hole.   In the extraction method of the existing pile of any one of Claims 1-6, when drilling a plurality of the boring holes, the boring holes are sequentially drilled using the same cutting rod. A method of pulling out an existing pile as a feature.   In the extraction method of the existing pile of any one of Claims 1-7, while attaching and fixing the jig which has a downward jack receiving surface to the exposed part exposed from the said ground of the said existing pile, this jack receiving surface and A method for pulling out an existing pile, wherein a push-up jack is arranged in an opposing state, and the jack is lifted and pulled out by pushing up the jack receiving surface of the jig.

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