JP2006037657A - Pile lifting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lift a heavy pile without a winch. <P>SOLUTION: This pile lifting apparatus includes: a casing 2 having a pile penetrating space S inside; a pile drop preventing chuck 3 disposed between the casing 2 and the pile penetrating space S and connected to the casing 2; a pile lifting chuck 5 disposed between the casing 2 and the pile penetrating space S and provided on the casing 2 to freely elevate through a plurality of hydraulic cylinders 4; and a control device for controlling the chucks 3, 5 and the hydraulic cylinders 4. The control device sequentially repeats a chuck descending time zone in which the pile lifting chuck 11 in the non-gripping state with the pile drop preventing chuck 3 still in the gripping state is caused to descend by the hydraulic cylinders 4, a simultaneous gripping time zone in which both chucks 3, 5 are simultaneously put in the gripping state; a pile lifting time zone in which the pile lifting chuck 5 in the gripping state with the pile drop preventing chuck 3 still in the non-gripping state is caused to be lifted by the hydraulic cylinders 4; and a simultaneous gripping time zone in which both chucks 3, 5 are put in the gripping state at the same time in this order. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pile pull-up device that pulls an underground pile excavated from the outside to the ground.

Conventionally, as a method of removing unnecessary piles buried in the ground, the casing is connected to an auger machine that moves up and down along the leader so as to be rotationally driven, and buried in the ground with a drilling blade at the tip of the casing Excavation around the pile, cutting the edge between the pile and the ground, hooking the wire to the head of the pile and forcibly pulling it up with a winch (Patent Document 1), or similarly excavating the periphery of the pile with a casing After the edge of the pile and the ground is cut, the pile is gripped by a plurality of locking claws provided in the lower part of the casing, and pulled up together with the casing by lifting the auger machine with a winch (Patent Document 2).
Japanese Patent Publication No. 5-63576 JP 2001-3362 A

  The conventional method is used when a lightweight PC pile is pulled out because the lifting force of the winch that pulls out the pile is about 5 tons. By the way, a large-diameter concrete pile has a diameter of 1M and a weight of 30M and a weight of 54 tons, a diameter of 1.5M and a weight of a length of 30M is 122 tons, a diameter of 2.0M and a weight of a length of 30M is 217 tons. . Therefore, in the conventional method, there is a problem that a very heavy large-diameter concrete pile cannot be pulled up with a winch. Then, in order to solve the said problem, this invention aims at provision of the pile extraction apparatus which can draw out a heavy pile without using a winch.

In order to pull up a heavy pile without using a winch, the means adopted by the present invention according to claim 1 is a casing in which a pile penetrating space is formed inside, and the casing is disposed between the casing and the pile penetrating space and connected to the casing. Pile fall prevention chuck, a pile lifting chuck which is arranged between the casing and the pile penetrating space and is connected to the casing via a plurality of hydraulic cylinders, and the chuck and the hydraulic cylinder are controlled. The control device includes a chuck lowering time zone in which the pile lifting chuck in the non-gripping state is lowered with the hydraulic cylinder while the pile dropping prevention chuck is in the gripping state, and simultaneously holds both chucks in the gripping state. Lift the pile pulling chuck in the gripping state with the hydraulic cylinder while the gripping chuck is in the non-gripping state and the simultaneous gripping time zone. Piles pulling time zone, a pile pull-up apparatus characterized by sequentially repeating the simultaneous gripping hours in this order to both simultaneously gripping state chuck.
In the present invention, the casing is fixed so that the pile penetrates the pile penetration space, and the chuck lowering time zone, the simultaneous gripping time zone, the pile lifting time zone, and the simultaneous gripping time zone are sequentially repeated in this order. The pile can be lifted intermittently by the hydraulic cylinder stroke size by the pile lifting chuck that holds the pile during the pile lifting time zone, and the heavy pile is pulled up by using multiple hydraulic cylinders to increase the lifting force. be able to.

In order to increase the degree of freedom of arrangement of the plurality of hydraulic cylinders, the means adopted by the present invention according to claim 2 is characterized in that the casing includes an outer casing and an inner casing inserted so as to be movable up and down from above the outer casing. The pile pulling-up device according to claim 1, wherein the plurality of hydraulic cylinders are arranged between the outer casing and the inner casing, the pile dropping prevention chuck is connected to the outer casing, and the pile lifting chuck is connected to the inner casing. It is.
In the present invention, it is possible to disperse and arrange a plurality of hydraulic cylinders between the outer casing and the inner casing by connecting the plurality of hydraulic cylinders and the pile lifting chuck via the inner casing. It becomes.

The means employed by the present invention according to claim 3 to cope with a change in the outer diameter of the pile is that the pile lifting chuck includes a plurality of sets of nail tools arranged outside the pile penetrating space and adjacent nail tools. A plurality of coupling tools that can be coupled to change the coupling length dimension, and each set of claw tools includes a claw that advances and retracts between a standby position and a gripping position, and an operation tool that advances and retracts the claw. 2. The pile pulling and lifting device according to 2.
In the present invention, since the outer diameter of the pile greatly changes along the longitudinal direction of the pile, when the range of the outer diameter of the pile that can be gripped by advancing and retracting each pawl of the pile lifting chuck is exceeded, The range which can be hold | gripped can be adjusted by changing all the connection tools of any number or arbitrary connection length dimensions.

The means adopted by the present invention according to claim 4 is that the connecting tool is connected to one link connected to one nail tool and the other nail tool so that the connecting length dimension of the connecting tool can be easily adjusted. The other link, the adjustment portion having the inclined region, and the wedge-shaped portion that opposes the straight portion, and the adjustment portion is in contact with the other link through the insertion hole of both links along the straight portion. The pile pulling-up device according to claim 3, further comprising: an adjustment piece in which the linear portion is in contact with one link; and an advancing / retracting operation tool that is provided between the adjustment piece and the one link and advances and retracts the adjustment piece. . In order to prevent the connection length from changing even when a large tensile force is applied to the connection tool as the pile is pulled up, the adjustment piece extends in parallel with the straight line portion at both ends of the inclined area of the adjustment section. In some cases, a parallel portion is provided, and the parallel portion is in contact with the other link.
In the present invention, the connection length dimension of the connection tool can be changed by moving the wedge-shaped portion of the adjustment piece by the operation of the advance / retreat operation tool and changing the dimension between the portions in contact with both links. Even when a large tensile force is applied to both links connected via the adjustment piece when the pile is gripped by the pile pulling chuck, the pushing back force applied to the adjustment piece via the adjustment portion can be reduced. When the parallel part provided on the adjustment piece comes into contact with the other link, the pushing back force applied to the adjustment piece becomes zero, and the pile can be securely grasped and pulled up by the pile lifting chuck without moving the adjustment piece. it can.

The pile pulling and lifting device according to the first aspect of the present invention can increase the lifting force by using a plurality of hydraulic cylinders, and can lift a heavy pile.
In the pile pulling and lifting device according to the second aspect of the present invention, a plurality of hydraulic cylinders can be distributed and arranged between the outer casing and the inner casing. The degree is increased and the hydraulic cylinder can be arranged at an optimum position.

The pile pulling and lifting device according to the present invention described in claim 3 can adjust the range that can be gripped by changing the connection length dimension of the connector, and can cope with the change in the outer diameter of the pile.
In the pile pulling-up device according to the present invention, the connection length dimension of the connector can be easily adjusted by moving the wedge-shaped adjusting piece by operating the advance / retreat operation tool.

  A pile pulling and lifting device according to the present invention (hereinafter referred to as “the present invention device”) will be described based on an embodiment shown in the drawings.

(First embodiment)
1 to 7 show a first embodiment of the device of the present invention, and FIG. 1 is a front sectional view showing the device 1 of the present invention. FIG. 2 is an enlarged view of the pile lifting chuck 5, (A) is a partially sectional side view, (B) is two sets of nail tools 11, 11 and a connecting tool 12. The front view which carried out the partial cross section which shows the state which lengthened the connection length dimension W of the nail | claw tools 11 and 11, (C) is the plane sectional view cut in the CC line of (B). FIG. 3 is an enlarged view of the pile lifting chuck 5, in which two sets of claw tools 11, 11 and a connection tool 12 are developed and the connection length dimension W of the two sets of claw tools 11, 11 is shortened. It is the front view which carried out the partial cross section which showed the state which carried out. 4A and 4B show another embodiment of the connector 12, in which FIG. 4A is a partially sectional front view showing a state in which the connection length is shortened, and FIG. 4B shows a state in which the connection length is increased. It is the front view which carried out the partial cross section. FIG. 5 is an enlarged view of the pile dropping prevention chuck 3, wherein (A) is a partially sectional side view, and (B) is a front view showing two sets of nail tools. FIG. 6 is a partial cross-sectional front view showing a state before the device 1 of the present invention is inserted into the ground concave portion Ga formed around the upper end of the underground pile P. FIG. 7 shows each process of pulling up the underground pile P using the device 1 of the present invention inserted and fixed in the ground, and (A) shows the pile dropping prevention chuck 3 in the gripping state. A half-cut longitudinal sectional view showing the state of the chuck lowering time zone in which the non-gripping state pile lifting chuck 5 is lowered by the hydraulic cylinder 4, and (B) is the simultaneous gripping time zone in which both chucks 3 and 5 are held simultaneously. FIG. 6C is a half-cut longitudinal sectional view showing the state of the pile, and shows a state of a pile lifting time zone in which the pile lifting chuck 5 in the gripping state is lifted by the hydraulic cylinder 4 while the pile dropping prevention chuck 3 is in the non-holding state. Half-cut longitudinal sectional view, (D) is a half-cut longitudinal sectional view showing a state of a simultaneous gripping time zone in which both chucks 3 and 5 are gripped simultaneously after the underground pile P is pulled up.

  As shown in FIG. 1, the device 1 of the present invention includes a casing 2 in which a pile penetrating space S is formed inside, and a pile dropping prevention chuck 3 disposed between the casing 2 and the pile penetrating space S and connected to the casing 2. The pile lifting chuck 5 which is disposed between the casing 2 and the pile penetration space S and is connected to the casing 2 via a plurality of hydraulic cylinders 4 and which can be raised and lowered, and these chucks 3 and 5 and the hydraulic cylinder 4 are controlled. A control device (not shown) is provided.

  The casing 2 includes a cylindrical outer casing 6 and a cylindrical inner casing 7 inserted so as to be movable up and down from above the outer casing 6. A plurality of hydraulic cylinders 4 are provided between the outer casing 6 and the inner casing 7. , The pile dropping prevention chuck 3 is connected to the outer casing 6, and the pile lifting chuck 5 is connected to the inner casing 7. The outer casing 6 of this example is provided with a connecting portion 6a on the lower end side so that it can be connected to the upper end 10a of the casing 10 for excavation (see FIG. 6). The outer casing 6 is provided with earth and sand discharging spiral blades 6b on the outer peripheral surface as necessary.

  The plurality of hydraulic cylinders 4 are distributed and arranged outside the inner casing 7 protruding from the outer casing 6, and the upper end side of each hydraulic cylinder 4 is connected to the inner casing 7 via the bracket 8, and the lower end side Is connected to the outer casing 6 via a bracket 9. For example, when the cylinder inner diameter is 200 mmφ and the hydraulic pressure is 70 kg / cm 2, the hydraulic cylinder 4 has a lifting force of about 21 tons per cylinder. By providing 11 cylinders, a lifting force of 231 tons can be obtained. The plurality of hydraulic cylinders 4 are hydraulically connected to a control device (not shown) so as to move up and down in synchronization.

  As shown in FIGS. 2 and 3, the pile lifting chuck 5 is adjacent to a plurality of sets of claw tools 11 that are dispersedly arranged around the outside of the pile penetration space S and suspended swingably on the inner casing 7. A plurality of connecting tools 12 that can change the connecting length dimension by connecting the nail tools 11, 11 are provided, and a plurality of sets of nail tools 11 are connected in an annular shape by the connecting tool 12. Each pair of claw tools 11 is operated by a guide tool 13, a claw 14 that is guided by the guide tool 13 to advance and retract between the non-gripping position F and the gripping position E, and the claw 14 is moved back and forth from the non-gripping state to the gripping state. An operation tool 15 is provided. The guide 13 is suspended from a bracket 16 attached to the inner casing 7 through an intermediate link 17 so as to be swingable. The claw 14 is a slider that is slidably guided in the guide groove 13a of the guide 13 and is suspended from the bracket 16 via an operating tool 15 that is a hydraulic cylinder. The guide 13 tilts the guide groove 13a so that the claw 14 guided by the guide groove 13a moves toward the pile penetration space S as it moves downward and shifts from the non-gripping state to the gripping state. It is in a state. The pile lifting chuck 5 has the guide groove 13a in an inclined state, so that the pawl 14 bites into the outer peripheral surface of the pile P when lifted in a gripping state.

  In order to obtain a gripping force capable of lifting the heavy pile P, the pile lifting chuck 5 has a number of claw tools 11, the area and shape of the gripping surface of the pawl 14, and the pressing force of the pawl 14 against the outer peripheral surface of the pile P. Is selected.

  The connecting tool 12 for connecting the adjacent nail tools 11 and 11 includes a link 18 connected to one nail tool 11 (left side in FIG. 2B) and the other nail tool 11 (right side in the same figure). The link 19 connected to the link 18, the adjustment piece 20 inserted through the insertion holes 18 a, 19 a of both the links 18, 19, and the operation piece provided between the adjustment piece 20 and one of the links 18. 21. The two links 18 and 19 are provided in two sets so as to connect the upper and lower sides of the adjacent nail tools 11 and 11. The adjustment piece 20 has a wedge-shaped portion 20c in which an adjustment portion 20a having an inclined region and a straight portion 20b are opposed to each other, and is adjusted while moving forward and backward along the straight portion 20b to the insertion holes 18a and 19a of both links 18 and 19. The portion 20 a is in contact with the other link 19, and the straight portion 20 b is in contact with the one link 18. The adjustment piece 20 is provided with wedge-shaped portions 20c at two locations so as to correspond to the two sets of both links 18 and 19. The adjustment piece 20 has a long connection length dimension W between the adjacent claw tools 11 and 11 as shown in FIG. 2 (B) by moving the adjustment portion 20a in contact with the other link 19. State) to a short state (state shown in FIG. 3). The operating tool 21 for advancing and retracting the adjustment piece 20 includes a bracket 29 attached to one link 18 and a hydraulic cylinder 30 connected to the bracket 29 and the adjustment piece 20, and extends and contracts the output shaft of the hydraulic cylinder 30. The adjustment piece 20 is moved forward and backward.

  In addition, as shown in FIG. 4, the adjustment piece 20 is provided with parallel portions 20d and 20d extending in parallel with the straight portion 20b on both ends of the inclined region of the adjustment portion 20a, and each parallel portion 20d is connected to the other link. 19 may be configured to contact 19. The adjustment piece 20 moves and changes the parallel portion 20d that contacts the other link 19, so that the connection length dimension W between the adjacent claw tools 11 and 11 is long (see FIG. 2B). From the state shown) to a short state (state shown in FIG. 3). When the parallel portion 20d provided on the adjustment piece 20 contacts the other link 19, even if a large tensile force is applied to the links 18 and 19 by gripping the pile P, the adjustment piece 20 is moved along the straight portion 20b. Since no pushing back force is generated, the pile P can be reliably gripped and pulled up by the pile lifting chuck 5 without moving the adjustment piece 20.

  As shown in FIG. 5, the pile dropping prevention chuck 3 includes a plurality of sets of claw tools 23 that are dispersedly arranged around the outside of the pile penetration space S and connected to the outer casing 6. Each pair of claw tools 23 is a guide tool 25, a claw 26 that is guided by the guide tool 25 to advance and retreat between the non-gripping position J and the gripping position K, and the claw 26 is moved back and forth from the non-gripping state to the gripping state An operation tool 24 is provided. The guide tool 25 is fixed to the outer casing 6 or is suspended from a bracket 27 attached to the outer casing 6 via an intermediate link (not shown). The claw 26 is a slider that is slidably guided in the guide groove 25a of the guide tool 25, and is suspended from the bracket 27 via the operation tool 24 formed of a hydraulic cylinder. The guide tool 25 inclines the guide groove 25a so that the claw 26 guided by the guide groove 25a moves toward the pile penetration space S as it moves downward and shifts from the non-gripping state to the gripping state. It is in a state. The pile dropping prevention chuck 3 causes the claw 26 in the gripped state to bite into the outer peripheral surface of the pile P by making the guide groove 25a in an inclined state.

  The pile fall prevention chuck 3 that merely temporarily holds the underground pile P pulled up intermittently and simply prevents the fall can make the gripping force weaker than the pile lifting chuck 5 that raises the pile P. . Therefore, the pile dropping prevention chuck 3 of the present example has a steep slope in the guide groove 25a of the guide tool 25 compared to the guide groove 13a of the guide tool 13 provided in the pile lifting chuck 5, and each claw The movement dimension toward 26 pile penetration space S is enlarged, and it can cope even if the error with respect to the nominal diameter of the pile P becomes large. When the guide tool 25 is swingably suspended from the outer casing 6, the guide tools 25 of the adjacent claw tools 23 are connected to each other by the connecting tool 12 (FIGS. 2 and 3), as in the case of the pile lifting chuck 5. In other words, it is possible to change the length of the connection by changing the length of the connection to the case where the error with respect to the nominal diameter of the pile P becomes very large.

  As shown in FIG. 7, the control device has a chuck lowering time zone in which the non-gripping pile lifting chuck 5 is lowered by the hydraulic cylinder 4 while the pile dropping prevention chuck 3 is held (see FIG. 7A). ), A simultaneous gripping time zone in which both chucks 3 and 5 are gripped at the same time (see FIG. 5B), and a pile lifting chuck 5 in the gripping state while the pile dropping prevention chuck 3 is in a non-grip state. Is lifted by the hydraulic cylinder 4 (see (C) in the same figure), and the simultaneous gripping time period in which both chucks 3 and 5 are held simultaneously after the pile lifting chuck 5 is lifted (see the same figure). (See (D)) are sequentially repeated in this order.

  In the chuck lowering time zone (see FIG. 1A), the output shaft of the operation tool 24 composed of a hydraulic cylinder provided in each claw tool 23 of the pile dropping prevention chuck 3 is projected, and each claw 26 is moved to the pile P. The pile P is moved and gripped, and the output shaft of the operation tool 15 composed of a hydraulic cylinder provided in each claw tool 11 of the pile pulling chuck 5 is moved backward to separate each claw 14 from the pile P. Move to the non-gripping state.

  In the simultaneous gripping time zone (see FIG. 5B), the operating tool 15 comprising a hydraulic cylinder provided in each claw tool 11 of the pile lifting chuck 5 while maintaining the gripping state of the pile dropping prevention chuck 3. The output shaft is protruded and the claws 14 are moved toward the pile P to grip the pile P. In the subsequent pile lifting time zone (see FIG. 5 (C)), the operation comprising the hydraulic cylinders provided in the pawls 23 of the pile dropping prevention chuck 3 while maintaining the gripping state of the pile lifting chuck 5. After the output shaft of the tool 24 is retracted and the claws 26 are moved away from the pile P so as to be in the non-gripping state, the output shafts of the plurality of hydraulic cylinders 4 are projected in a synchronized state, and the pile P The inner casing 7 is lifted together with the pile pulling chuck 5 that holds the pile, and the pile P is lifted so as to be pulled out by the stroke dimension L of the output shaft of the hydraulic cylinder 4.

  Next, in the simultaneous gripping time zone (see FIG. 4D), the operation comprising the hydraulic cylinders provided in the pawls 23 of the pile dropping prevention chuck 3 while the gripping state of the pile lifting chuck 5 is maintained. The output shaft of the tool 24 is protruded, and the claws 26 are moved toward the pile P to grip the pile P. In the subsequent chuck lowering time zone (see FIG. 1A), the operation comprising the hydraulic cylinders provided in the respective pawls 11 of the pile lifting chuck 5 while maintaining the gripping state of the pile dropping prevention chuck 3. The output shaft of the tool 15 is retracted, and each claw 14 is moved away from the pile P in the non-gripping state. Then, the output shafts of the plurality of hydraulic cylinders 4 are retracted in a synchronized state, and are not gripped. The inner casing 7 is lowered by the stroke dimension L together with the pile lifting chuck 5 in the state.

  The control device includes a hydraulic unit that pumps and collects oil, a sequence control unit, a switching valve that is controlled by the sequence control unit, and the like, and each operation tool 24 that includes a hydraulic cylinder provided in the pile dropping prevention chuck 3. In addition, the chuck lowering time zone, the simultaneous gripping time zone, and the pile lifting time zone are obtained by sequentially controlling the pumping and collecting of the oil to and from the respective operation tools 15 and the plurality of hydraulic cylinders 4 provided in the pile lifting chuck 5. The simultaneous gripping time period is sequentially repeated in this order.

  Next, a method of pulling up the underground pile P using the device 1 of the present invention will be described based on each work process. In the first excavation process, as shown in FIG. 6, the periphery of the pile P is excavated and the edge between the pile P and the ground G is cut. This excavation is performed with the excavating casing 10 connected to an auger machine that moves up and down along a leader (not shown), and excavating around the pile P with the excavating blade 10b provided at the tip of the excavating casing 10 for excavation. The earth and sand are discharged to the ground by the earth and sand discharging spiral blade 10 c provided on the outer periphery of the casing 10.

  In the second invention apparatus insertion step, as shown in FIG. 6, the apparatus 1 of the present invention is inserted into the surface recess Ga formed around the upper end of the underground pile P, and the apparatus of the present invention is inserted into the upper end 10 a of the excavating casing 10. It connects so that the connection part 6a of the lower end of 1 outer casing 6 may be fitted. At this time, the device 1 of the present invention keeps the pile dropping prevention chuck 3 and the pile lifting chuck 5 in a non-gripping state.

  As shown in FIG. 7, the third pile pulling-up process includes operating tools 15, 24 including hydraulic cylinders provided on the pile dropping prevention chuck 3 and the pile lifting chuck 5 with a control device (not shown), By controlling a plurality of hydraulic cylinders 4 for lifting the underground pile P gripped by the lifting chuck 5, the pile lifting chuck 5 in the non-gripping state is maintained in the hydraulic cylinder while the pile dropping prevention chuck 3 is gripped. 4 (see (A) in the same figure), a simultaneous gripping operation (see (B) in the same figure) that simultaneously brings both chucks 3 and 5 into a holding state, and a chuck 3 for preventing pile dropping. Pile pulling operation (see Fig. 1C) for lifting the pile lifting chuck 5 in the gripped state with the hydraulic cylinder 4 in the gripped state, and gripping both chucks 3 and 5 simultaneously after lifting the underground pile P Same The gripping operation (see FIG. (D)) are sequentially repeated in this order, increased pull the stroke dimension L increments intermittently pile P of the output shaft of the hydraulic cylinder 4. The device 1 of the present invention can increase the lifting force by using a plurality of hydraulic cylinders 4 and can lift a heavy pile P.

  By the way, large-diameter piles are constructed by an in-situ pile method in which concrete is placed after inserting iron into a hole excavated in the ground, but a partial collapse occurred on the inner peripheral surface of the excavation hole, etc. May have a large diameter locally. This locally large diameter portion is scraped to some extent by the excavating blade 10b of the excavating casing 10 when excavating around the underground pile P in the first step, but does not become a perfect circle. Therefore, when the size of the large diameter portion of the underground pile P exceeds the allowable gripping range at the nominal diameter of the pile lifting chuck 5, as shown in FIGS. 5 is adjusted to a range in which the underground pile P can be gripped by adjusting the connecting length dimension W of the adjacent nail tools 11 and 11 with the connecting tool 12 provided in the connector 5. In the case of this example, the connection length dimension W can be lengthened by pushing down the adjustment piece 20 of the connection tool 12 (see FIGS. 2B and 4B), and conversely, the adjustment piece of the connection tool 12. The connection length dimension W can be shortened by lifting 20 (see FIGS. 3 and 4A). By selecting the number of the connecting tools 12 to be adjusted according to the degree of the large diameter of the underground pile P, it is possible to adjust stepwise over a wide range.

  In the third pile pulling-up step, if the underground pile P is pulled up by an appropriate size, both chucks 3 and 5 are held at the same time, and the portion of the pile P protruding to the ground is cut and separated. When the extraction of the underground pile P is completed, the present invention device 1 and the excavation casing 10 are removed from the ground, and the remaining holes after the removal of the pile P are backfilled to complete the operation.

(Second Embodiment)
FIG. 8 shows the device 31 of the present invention according to the second embodiment. FIG. 8A shows a hydraulic pressure applied to the pile lifting chuck 5 in the non-gripping state while holding the pile P with the pile dropping prevention chuck 3. Front sectional view showing a state of being lowered by the cylinder 4, (B) is a state in which the pile dropping prevention chuck 3 is brought into a non-gripping state and the pile lifting chuck 5 in the grasping state is lifted together with the pile P by the hydraulic cylinder 4 FIG.

  The present invention device 31 according to the present embodiment is greatly different from the present invention device 1 according to the first embodiment in that the casing 32 having a pile penetration space S formed therein is provided as one piece, and the casing 32 and the pile. The pile lifting chuck 5 disposed between the through spaces S is suspended from the casing 32 via a plurality of hydraulic cylinders 4 so as to be movable up and down. The configuration other than this difference is substantially the same as that of the inventive device 31 according to the first embodiment, and the same reference numerals shown in the drawings indicate the same constituent members.

  In the device 31 according to the present invention, the pile lifting chuck 5 is disposed above and the pile dropping prevention chuck 3 is disposed below. The pile lifting chuck 5 suspends the claw tool 11 from the casing 32 via the hydraulic cylinder 4 so that the claw tool 11 can be raised and lowered, and connects the adjacent claw tools 11 and 11 with the connection tool 12 as in the first embodiment. Thus, the connection length dimension can be changed (see FIGS. 2, 3 and 4).

  The control device provided in the device 31 of the present invention is a chuck lowering time zone in which the non-gripping pile lifting chuck 5 is lowered by the hydraulic cylinder 4 while the pile dropping prevention chuck 3 is held (see FIG. 3A). ), A simultaneous gripping time zone (not shown) in which both the chucks 3 and 5 are gripped at the same time, and the pile pulling chuck 5 in the gripped state while the pile dropping prevention chuck 3 is kept in the non-gripping state. Pile pulling time zone (see Fig. (B)) to be lifted at the same time and a simultaneous gripping time zone (not shown) for holding both chucks 3, 5 at the same time with the pile lifting chuck 5 raised. It is configured to repeat sequentially in order.

  The operation of pulling up the underground pile P using the device 31 of the present invention is the same as the first excavation process, the second device insertion process of the present invention, and the third pile pulling-up process in the first embodiment. The work is performed, and the pile P is pulled out intermittently by the stroke dimension L of the output shaft of the hydraulic cylinder 4.

1 shows a first embodiment of the device of the present invention, and is a front sectional view showing the device of the present invention. FIG. 2 is an enlarged view of a pile pulling chuck according to the embodiment, in which (A) is a partial cross-sectional side view, and (B) is a pair of nail tools and a pair of nail tools that are developed. The front view which carried out the partial cross section which shows the state which lengthened the connection length dimension of (C), (C) is the plane sectional view cut in the CC line of (B). FIG. 2 is an enlarged view of a pile pulling chuck according to the embodiment, in which two sets of nail tools and a connecting tool are developed and a partial cross section showing a state in which the connection length dimension of the two sets of nail tools is shortened. It is a front view. FIG. 2A shows another embodiment of the connector, in which FIG. 1A is a partially sectioned front view showing a state where the connection length dimension is shortened, and FIG. 2B is a partially sectional front view showing a state where the connection length dimension is lengthened. FIG. FIG. 2 is an enlarged view of a pile dropping prevention chuck, wherein (A) is a partially sectioned side view, and (B) is a front view showing two sets of nail tools developed. It is the front view which carried out the partial cross section which shows the state before inserting this invention apparatus in the ground surface recessed part formed around the upper end vicinity of an underground pile. 1 shows each step of pulling up a pile using the device of the present invention inserted and fixed in the ground, and (A) shows a pile lifting chuck in a non-gripping state while the pile dropping prevention chuck is held. A half cut longitudinal sectional view showing the state of the chuck lowering time zone where the chuck is lowered by the hydraulic cylinder, (B) is a half cut longitudinal sectional view showing the state of the simultaneous gripping time zone where both chucks are held simultaneously, (C) Is a half-cut longitudinal sectional view showing a state of a pile lifting time zone in which the pile lifting chuck in a gripped state is lifted by a hydraulic cylinder while the pile dropping prevention chuck is in a non-gripping state, and (D) is a lift of the underground pile FIG. 5 is a half-cut longitudinal sectional view showing a state of a simultaneous gripping time zone in which both chucks are gripped at the same time later. FIG. 2 shows a second embodiment of the device of the present invention, in which (A) shows a state in which a pile lifting chuck 5 in a non-gripping state is lowered by a hydraulic cylinder 4 while holding a pile with a pile dropping prevention chuck. FIG. 5B is a front sectional view showing a state in which the pile dropping prevention chuck 3 is brought into a non-gripping state and the pile lifting chuck 5 in the gripping state is lifted together with the pile P by the hydraulic cylinder 4. .

Explanation of symbols

2 ... casing, 3 ... pile fall prevention chuck, 4 ... hydraulic cylinder, 5 ... pile lifting chuck, S ... pile penetration space

Claims (4)

  A casing in which a pile penetration space is formed inside, a pile fall prevention chuck arranged between the casing and the pile penetration space and connected to the casing, and a plurality of the casing arranged between the casing and the pile penetration space And a control device for controlling the chuck and the hydraulic cylinder, and the control device is in a non-gripping state while the pile dropping prevention chuck is in a gripping state. Chuck lowering time zone when lowering the chuck for lifting piles with a hydraulic cylinder, simultaneous gripping time zone for holding both chucks at the same time, and for lifting piles in a gripped state with the chuck for preventing pile fall off in a non-gripping state Pile pulling time zone for lifting the chuck with a hydraulic cylinder and simultaneous gripping time zone for holding both chucks simultaneously Pile pull-up apparatus, characterized in that the return Ri.   The casing includes an outer casing and an inner casing inserted so as to be movable up and down from above the outer casing. The plurality of hydraulic cylinders are disposed between the outer casing and the inner casing, and the pile falling prevention chuck is disposed on the outer casing. The pile pull-up device according to claim 1, wherein the pile pull-up chuck is connected to the inner casing and connected to the inner casing.   The pile pulling chuck includes a plurality of sets of nail tools arranged outside the pile penetrating space and a plurality of connecting tools that can connect adjacent nail tools to change the connection length dimension. The pile pulling-up device according to claim 1 or 2, further comprising a claw for the claw tool to move back and forth between the standby position and the gripping position, and an operation tool for moving the claw back and forth. The means adopted by the present invention according to claim 4 is that the connecting tool is connected to one link connected to one nail tool and the other nail tool so that the connecting length dimension of the connecting tool can be easily adjusted. The other link, the adjustment portion having the inclined region, and the wedge-shaped portion that opposes the straight portion, and the adjustment portion is in contact with the other link through the insertion hole of both links along the straight portion. The pile pulling-up device according to claim 3, further comprising: an adjusting piece in which the linear portion is in contact with one link; and an advancing / retracting operation tool that is provided between the adjusting piece and the one link and advances and retracts the adjusting piece.

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