CN117355649A - Quick load test device of stake - Google Patents

Abstract

The invention provides a rapid load test device for safely and rapidly lifting a heavy hammer to a pile with an original height. The pile head comprises a frame body (1) which is arranged upright near the pile head (A), a weight lifting jack (5) which is arranged on the frame body (1) and lifts a weight (3) falling to the pile head (A) to the original height through a weight lifting rod (4), and a weight holding chuck (7) which enables the weight (3) to be detachably hung at the lower end part of the weight lifting rod (4). The weight lifting jack (5) comprises a jack body (8) for lifting the weight (3), and an upper chuck (9) and a lower chuck (10) which are respectively arranged on the upper side and the lower side of the jack body (8) and used for holding and releasing the weight lifting rod (4). When the weight lifting jack (5) lifts the weight (3), the upper chuck (9) holds the weight lifting rod (4), and the lower chuck (10) releases the weight lifting rod (4). When the upper chuck (9) releases the weight lifting rod (4) and descends with the contraction of the weight lifting jack (5), the lower chuck (10) holds the weight lifting rod (4).

Description

Quick load test device of stake

Technical Field

The present invention relates to a quick load test device for a pile, which confirms the supporting force of the pile by the axial pressing force of the pile applied to the pile head by a weight falling to the pile head protruding from a ground surface, and which enables the weight falling to the pile head to be lifted up to an original height extremely safely and quickly.

Background

As a method for confirming the supporting force of a pile, a static load test performed under the same conditions as an actual pile is widely known, but there are problems that a reaction force resisting body (reaction force pile), a load beam, and the like are required to be provided, so that when a particularly large load is applied, a large test is performed, and a time are required for the test, which is accompanied by an increase in the construction period and the cost.

Accordingly, a rapid load test of a pile in which a weight is lowered onto an actual pile head to apply an axial pressing force to the pile to confirm a supporting force is attracting attention.

For example, in patent document 1, a jack (jack), a winch, a crane, or the like is used as a mechanism for lifting the weight dropped to the pile head to an original height, in particular, the mechanism including the weight dropped to the pile head, the weight capturing device for capturing the weight dropped to the pile head and the weight lifted up, and the lifting device for lifting the weight dropped to the pile head to the original height.

For example, in order to hoist a weight dropped to a pile head to an original height using a crane, the following operations have been repeatedly performed so far: the method comprises the steps of suspending a heavy hammer from a threaded rod, extending or contracting a jack holding the threaded rod, suspending the threaded rod together with the heavy hammer for a long stroke, fastening a temporary fixing nut screwed with an external thread part of the threaded rod, temporarily fixing the threaded rod, recovering the piston rod, and extending or contracting the jack again to suspend the threaded rod together with the heavy hammer.

Prior art literature

Patent literature

Patent document 1: japanese patent No. 6613430

Patent document 2: japanese patent laid-open No. 2005-68802

Patent document 3: japanese patent laid-open No. 2002-303570

Patent document 4: japanese patent No. 6693778

Non-patent literature

Non-patent document 1: "super jack System" 2010/08/06 social infrastructure agency JFE CIVIL, inc. [2021, search of 14 days 01 month ] https: (v/www.jfe) -civil. Com/infra/tokkou

Disclosure of Invention

Problems to be solved by the invention

However, in the conventional method of lifting the weight dropped to the pile head to the original height using the jack, the jack for lifting the weight is mounted on a structure constructed considerably high around the pile head, and the operation of the jack and the operation of temporarily fixing the lifting rod with the weight suspended are performed by one manual operation by an operator riding on the trolley, so that the operation is extremely poor and the efficiency is low.

In particular, the weight used in the quick load test of the pile is very heavy, for example, having 200t, and further, since the work of a height of usually 3 to 4m is lifted a small amount of several tens cm each time, it takes a very long time, and thus, it is forced to perform a work with low efficiency.

Further, since the worker is at a high place and performs the operation manually, the worker is not only extremely dangerous, but also sometimes fails during the operation to interrupt the test.

Further, a crane-type hoisting machine is known which automatically lifts a lifted load by using a crane having both functions of lifting and lowering, and is configured such that a stepping bar, a belt total threaded rod or wire, a PC steel strand, a stepping bar, or the like is used as a hoisting member for hoisting the lifted load, and in either case, the crane is used to lift the hoisting member together with the lifted load a constant amount each time, and finally the lifted load is automatically lifted to a target height.

For example, a super jack system is known which can perform lifting not only by lifting but also by lifting a heavy object which has been difficult in the past by using a jack having both lifting and lowering functions (non-patent document 1).

The super jack system is a jack system for raising and lowering a weight by raising and lowering a stepping bar with a joint by extension and contraction of a jack, and is mainly used for disassembly construction, construction, and the like of a building structure (patent document 4).

The present invention has been made to solve the above problems, and an object of the present invention is to provide a rapid load test device for hoisting a weight dropped to a pile head to an original height extremely safely and rapidly by using the technique of the super jack system.

Means for solving the problems

The present invention provides a quick load test device for a pile, which confirms a pile supporting force according to an axial pressing force applied to a pile head by a weight falling down to the pile head protruding to an actual ground surface, the quick load test device comprising: a frame body erected near the pile head; a weight lifting jack which is arranged on the framework body and lifts the weight falling to the pile head to the original height through a weight lifting rod; a weight holding chuck for detachably hanging the weight at the end of the weight lifting rod; and a guide device for guiding the weight, wherein the weight lifting jack comprises: a jack body for lifting the weight; and upper and lower chucks provided on the upper and lower sides of the jack body, respectively, for holding and releasing the weight lifting rod, wherein the quick load test device for a pile is configured such that, when the weight lifting jack lifts the weight, the upper chuck holds the weight lifting rod, and the lower chuck releases the weight lifting rod, and when the upper chuck releases the weight lifting rod and descends with shrinkage of the weight lifting jack, the lower chuck holds the weight lifting rod, and in particular, by alternately repeating expansion and contraction of the jack body of the weight lifting jack and holding and releasing of the weight lifting rod by the upper and lower chucks, the weight falling to the pile head can be lifted extremely safely and quickly to the original height.

In addition, a plurality of segments are provided at the outer periphery of the weight lifting rod at equal intervals in the axial direction of the weight lifting rod, so that the weight lifting rod can be reliably held by the upper chuck and the lower chuck, and the weight falling to the pile head can be safely and reliably lifted to the original height.

Further, the weight capturing device is provided to capture the weight that has jumped up at the pile head in the air, whereby the rebound of the weight can be prevented, and the weight lifting jack and the weight holding chuck can be safely operated by a remote device.

Effects of the invention

In particular, the present invention can hoist the weight dropped to the pile head to the original height extremely efficiently and quickly by alternately repeating the extension and retraction of the jack body of the weight hoist and the holding and releasing of the weight hoist lever by the upper chuck and the lower chuck.

Further, by setting the operation of the weight lifting jack to an automatic operation by remote operation, the occurrence of a failure can be eliminated as much as possible, and the weight can be lifted to the original height with high safety.

Drawings

Fig. 1 is a front view showing a state in which a weight is suspended from a weight chuck at a lower end portion of a weight lifting rod, and shows an embodiment of a rapid load test apparatus for piles.

Fig. 2 is a cross-sectional view of the rapid load testing apparatus of the pile illustrated in fig. 1.

FIG. 3 is a side view of the weight suspended by the weight chuck at the lower end of the weight lifting rod.

FIG. 4 is an enlarged view of the weight lifting jack.

Fig. 5 is an explanatory view of the operation of the weight lifting jack, and is an enlarged sectional view showing the operation of holding the weight lifting rod by the upper chuck and lifting the weight via the weight lifting rod by extending the jack body.

Fig. 6 is an explanatory view of the operation of the weight lifting jack, and is an enlarged sectional view showing the operation in which the upper chuck releases the weight lifting rod and descends along the weight lifting rod by contraction of the jack body.

FIG. 7 is an explanatory view of the operation of the weight lifting jack, and is an enlarged sectional view showing the operation of the upper chuck holding the weight lifting rod and retracting the jack body to lower the weight lifting rod.

Fig. 8 is an explanatory view of the operation of the weight lifting jack, and is an enlarged sectional view showing the operation in which the upper chuck releases the weight lifting rod and rises along the weight lifting rod by the extension of the jack body.

FIG. 9 is an exploded perspective view showing an example of the weight clamping device.

Fig. 10 (a) to (c) are vertical sectional views showing the operation of the weight clamping device shown in fig. 9.

FIG. 11 is a modified example of the weight capturing device, FIG. 11 (a) is a vertical sectional view, FIG. 11 (b) is a plan view, and FIG. 11 (c) is a vertical sectional view illustrating an operation.

Detailed Description

Fig. 1 to 11 are diagrams illustrating an embodiment of a rapid load testing apparatus for piles according to the present invention, in which a frame body 1 of the rapid load testing apparatus for piles is assembled so as to surround a pile head a which is actually protruded from a ground surface.

A frame 2 is provided above the frame body 1, a weight lifting rod 4 is vertically provided to the frame 2 toward the pile head a, and a weight 3 falling down toward the pile head a is suspended from the tip end of the weight lifting rod 4.

The stand 2 is also provided with a weight lifting jack 5 for lifting the weight 3 to a height at which the weight is lowered via a weight lifting rod 4.

The weight 3 is constituted by combining a plurality of blocks into one, and is constituted so that the entire weight can be adjusted by increasing or decreasing the number of the blocks.

The weight lifting rod 4 extends above the pile head a, vertically penetrates the weight lifting jack 5, and is supported by the weight lifting jack 5 to be vertically movable in the vertical direction on the stand 2.

Further, the joint portions 6 are formed at equal intervals in the axial direction of the weight lifting rod 4 on the outer periphery of the weight lifting rod 4, and tapered surfaces 6a having a truncated cone shape, which gradually become smaller in diameter from the lower end portion toward the upper end portion, are formed on the outer peripheral surface of each joint portion 6.

A chuck 7 for detachably holding the weight 3 is attached to the lower end portion of the weight lifting rod 4, and the weight 3 is detachably suspended from the lower end portion of the weight lifting rod 4 by being held by the chuck 7.

The chuck 7 is configured to hold the weight 3 detachably by, for example, hydraulic operation or the like, and to vertically set the weight 3 at the lower end portion of the weight lifting rod 4 by remote operation by wireless or wired operation, and to separate the weight 3 from the lower end portion of the weight lifting rod 4 to drop the weight 3 toward the pile head a.

The weight lifting jack 5 includes a jack body 8 that is extended and contracted in the vertical direction to lift the weight 3 to a lowered original height via the weight lifting rod 4, and an upper chuck 9 and a lower chuck 10 that are provided on the upper side and the lower side of the jack body 8, respectively, and hold and release the weight lifting rod 4.

The upper chuck 9 is configured to hold the weight lifting rod 4 and lift the weight 3 together with the weight lifting rod 4 when the weight 3 is lifted via the weight lifting rod 4 by extending the piston rod 8a of the jack body 8 (see fig. 5).

Further, the upper chuck 9 is configured to hold the weight lifting rod 4 and lower the weight lifting rod 4 together when the weight lifting rod 4 is lowered by contraction of the piston rod 8a of the jack body 8 (see fig. 7).

The upper chuck 9 releases the weight lifting rod 4 in a state where the lower chuck 10 holds the weight lifting rod 4, and is configured to be lifted up along the weight lifting rod 4 by the extension of the piston rod 8a of the jack body 8 (see fig. 8), and the upper chuck 9 is configured to be lowered along the weight lifting rod 4 by the contraction of the piston rod 8a in a state where the lower chuck 10 holds the weight lifting rod 4 (see fig. 6).

The lower chuck 10 is configured to release the weight lifting lever 4 when the weight lifting lever 4 is held by the upper chuck 9 and the weight 3 is lifted via the weight lifting lever 4 by extending the piston rod 8a of the jack body 8 (see fig. 3).

The lower chuck 10 is configured to hold the weight lifting rod 4 when the upper chuck 9 holds the weight lifting rod 4 and the weight lifting rod 4 is lowered by contraction of the piston rod 8a of the jack body 8 (see fig. 5), and when the upper chuck 9 releases the weight lifting rod 4 and the weight lifting rod 4 is lifted by extension of the piston rod 8a of the jack body 8 (see fig. 8).

When the upper chuck 9 and the lower chuck 10 are described in further detail, the upper chuck 9 includes: a chuck body 9a formed to be hollow; an engagement key 9b which is movably housed in the chuck body 9a in the vertical direction of the shaft of the weight lifting lever 4 and which holds and releases the lower side of the joint 6 of the weight lifting lever 4; a jack 9c which is provided in the weight lifting rod 4 so as to be extendable and retractable in the vertical direction of the axis and which pushes the engagement key 9b upward of the axis of the weight lifting rod 4; and a spring 9d for always pressing the engagement key 9b downward below the weight lifting lever 4.

Further, an intermediate rib 9e is formed inside the chuck body 9a, a jack 9c and a spring 9d are respectively built in the lower side and the upper side of the intermediate rib 9e, and a tapered surface 9f inclined toward the weight lifting rod 4 side is formed in an inverted truncated cone shape at the contact point of the intermediate rib 9e with the engagement key 9 b. The weight lifting lever 4 penetrates a loose hole formed in the center of the chuck body 9a, the jack 9b, and the engagement key 9b in the vertical direction.

In this structure, the spring 9d always presses the engagement key 9b downward in the axial direction of the weight lifting lever 4, and the engagement key 9b slides along the tapered surface 9f of the intermediate rib 9e toward the weight lifting lever 4 and engages with the lower side of the joint 6 of the weight lifting lever 4. That is, the upper chuck 9 holds the lower side of the joint 6 of the weight lifting lever 4 (see fig. 5). Thus, the weight 3 can be lifted by one stroke length of the piston rod 8a via the weight lifting rod 4 by extending the piston rod 8a of the jack body 8.

Further, the engagement key 9b is pushed up in the axial direction of the weight lifting lever 4 by the jack 9c, and the engagement key 9b slides in the opposite direction of the weight lifting lever 4 while being pushed up, and is separated from the lower side of the joint 6 of the weight lifting lever 4. That is, since the engagement key 9b releases the weight lifting lever 4, the upper chuck 9 is lowered to the original position along the weight lifting lever 4 with the contraction of the piston rod 8a of the jack body 8 (see fig. 6).

At this time, since the lower chuck 10 described later holds the weight lifting rod 4, the weight lifting rod 4 does not descend together with the upper chuck 9.

The operation (see fig. 5) of holding the weight lifting lever 4 by the engagement key 9b and lifting the weight 3 via the weight lifting lever 4 by extending the piston rod 8a of the jack body 8, and the operation (see fig. 6) of releasing the weight lifting lever 4 by the engagement key 9b and lowering the upper chuck 9 along the weight lifting lever 4 by contracting the piston rod 8a of the jack body 8 are repeated, whereby the weight 3 dropped to the pile head a can be lifted to the original dropped height.

The lower chuck 10 includes: a chuck body 10a formed to be hollow; an engagement key 10b which is movably housed in the chuck body 10a in the vertical direction of the shaft of the weight lifting lever 4 and which holds and releases the weight lifting lever 4; a jack 10c which is incorporated so as to be capable of extending and contracting in the vertical direction of the axis of the weight lifting lever 4 and which pushes the engagement key 10b upward of the axis of the weight lifting lever 4; and a spring 10d for always pressing the engagement key 10b downward below the weight lifting lever 4.

Further, an intermediate rib 10e is formed inside the chuck body 10a, and a jack 10c and a spring 10d are respectively incorporated in the lower side and the upper side of the intermediate rib 10 e. Further, a tapered surface 10f inclined toward the weight lifting lever 4 side is formed in such a manner that an abutment surface of the intermediate rib 10e against the engagement key 10b is in an inverted truncated cone shape. The weight lifting lever 4 penetrates a loose hole formed in the center of the chuck body 10a, the jack 10c, and the engagement key 10b in the vertical direction.

In this structure, the spring 10d always presses the engagement key 10b downward of the weight lifting lever 4, and the engagement key 10b slides along the tapered surface 10f of the intermediate rib 10e toward the weight lifting lever 4 and engages with the lower side of the joint 6 of the weight lifting lever 4. That is, the lower chuck 10 holds the lower side of the joint 6 of the weight lifting lever 4.

Thereby, the upper chuck 9 releases the suspension lever 4, and can be raised (see fig. 6) and lowered (see fig. 8) along the weight suspension lever 4 by extension and contraction of the piston rod 8a of the jack body 8.

Further, the jack 10c pushes the engagement key 10b upward on the shaft of the weight lifting lever 4, so that the engagement key 10b slides in the opposite direction of the weight lifting lever 4 while being pushed up, and releases the weight lifting lever 4.

Thereby, the upper chuck 9 holds the weight lifting rod 4, and is retracted by the piston rod 8a of the jack body 8 to be lowered together with the weight lifting rod 4 (see fig. 7). That is, the weight lifting rod 4 can be lowered by one stroke length of the piston rod 8a of the jack body 8.

Then, the operation (see fig. 7) of holding the weight lifting lever 4 by the engagement key 9b in a state where the lower chuck 10 releases the weight lifting lever 4 and lowering the weight lifting lever 4 by the contraction of the piston rod 8a of the jack body 8, and the operation (see fig. 6) of holding the weight lifting lever 4 by the engagement key 9b in a state where the lower chuck 10 releases the weight lifting lever 4 and raising the upper chuck 9 along the weight lifting lever 4 by the extension of the piston rod 8a of the jack body 8 are repeated, whereby the weight lifting lever 4 can be lowered to the position of the weight 3 of the pile head a.

Reference numeral 11 denotes a guide device for guiding the weight 3 during the time the weight 3 falls down to the pile head a and during the time the weight 3 falling down to the pile head a is lifted up to the original height, and includes a guide rail 11a and a guide roller 11b, the guide rail 11a is provided inside the column 1b of the frame body 1, and the guide roller 11b is provided on the weight 3 and the weight chuck 7 and runs on the guide rail 11 a.

In addition, reference numeral 12 denotes a weight catcher for catching the weight 3 in the air and preventing rebound of the weight 3 when the weight 3 falls down to the pile head a and jumps up. The weight capturing device 12 includes a weight capturing holder 13, a permanent magnet holder 14, and a weight drop preventing stopper 15, and is provided on a door-shaped frame 16 attached to the upper end portion of the frame body 1.

The weight capturing holder 13 and the permanent magnet holder 14 are respectively provided on the upper frame 1a of the frame body 1 and the upper frame 16a of the door-type frame 16, and the weight drop preventing stopper 15 is provided between the weight capturing holder 13 and the permanent magnet holder 14.

The weight catcher 13, the permanent magnet holder 14, and the weight drop preventing stopper 15 are disposed on the same vertical line, and a weight catcher bar 17, which will be described later, vertically penetrates the center portions of the weight catcher 13, the permanent magnet holder 14, and the weight drop preventing stopper 15 moves up and down freely along the weight catcher bar 17 between the weight catcher 13 and the permanent magnet holder 14.

Further, a concave portion 13a for the weight drop prevention stopper 15 to be inscribed is formed on the upper end side of the weight catch holder 13, the concave portion 13a is formed in an inverted truncated cone shape in which the outer diameter of the upper end portion is maximum and the diameter gradually decreases in the downward direction, and a loose hole 13b through which the weight catch lever 17 penetrates is formed in the bottom portion.

The weight drop prevention stopper 15 includes a plurality of balls 18 and a ball retainer 19 for retaining the balls 18, and the ball retainer 19 is formed in an inverted truncated cone shape having a largest outer diameter at an upper end portion and gradually decreasing in a downward direction in accordance with the shape of the concave portion 13 a.

A loose hole 19a through which the weight catch rod 17 passes is formed in the center portion of the ball retainer 19, and a plurality of ball receiving portions 19c each having a concave curved inner surface are formed between the loose hole 19a and the outer peripheral surface 19b at equal intervals in the circumferential direction and the up-down direction of the ball retainer body 19.

The ball receiving portions 19c are opened on the loose hole 19a side and the outer peripheral surface 19b side, and the balls 18 are received in the ball receiving portions 19c. Each ball 18 is rotatably provided in the ball housing portion 19c, is movable toward the loose hole 19a side and the outer peripheral surface 19b side, and is formed in a size such that a certain portion thereof protrudes toward one of the loose hole 19a side and the outer peripheral surface 19b side.

The permanent magnet holder 14 has a hole 14a through which the weight catch bar 17 passes in the center, and further has a buffer member such as a coil spring or vibration-proof rubber for reducing the impact of the weight 3 during the falling, and is provided on the upper frame 16a of the door-shaped frame 16.

The permanent magnet holder 14 adsorbs the weight drop preventing stopper 15 only when a magnetic force is generated by energizing, and the energizing operation can be performed by remote operation or automatic control by using a rectifier (not shown) for the permanent magnet holder in a wired or wireless manner.

The plurality of weight catching rods 17 are arranged around the weight lifting rod 4 at equal intervals, and the lower end of each weight catching rod 17 is connected to the upper end periphery of the weight 3. The upper end of each weight catch rod 17 continuously penetrates the weight catch holder 13, the weight drop prevention stopper 15, and the loose holes 13a, 15a, and 14a of the permanent magnet holder 14 of the weight catch device 12.

In such a configuration, when the weight 3 suspended from the tip end portion of the weight lifting rod 4 falls down to the pile head a and jumps up at the pile head a, if the power supply to the permanent magnet holder 14 is cut off, the weight falling-down preventing stopper 15 is separated from the permanent magnet holder 14 and falls down along the weight capturing rod 17 into the recess 13a of the weight capturing holder 13.

At the same time as the weight drop prevention stopper 15 drops into the concave portion 13a of the weight catch holder 13, the ball 18 is strongly pressed by the inner periphery of the concave portion 13a of the weight catch holder 13 toward the loose hole 15a, and a part protrudes into the loose hole 15a to strongly grip the weight catch lever 17, whereby the rebound of the weight 3 is suppressed.

The permanent magnet retainer 14 that adsorbs the weight drop prevention stopper 15 is attached to the upper frame 16a of the door frame 16 via a coil spring, a damping member such as a vibration-proof rubber, and therefore the weight 3 does not drop erroneously due to an impact or the like when the weight drops.

Fig. 11 (a) to (c) are diagrams illustrating a modification of the weight drop prevention stopper, in which a plurality of slits 20c are formed between the loose hole 20a and the outer peripheral surface 20b of the part holder 20 at equal intervals in the circumferential direction of the part holder 20, and wedge-shaped parts 21 are inserted into the respective slits 20 c.

In such a configuration, the stopper 15 is prevented from being attracted to the permanent magnet holder 14 by the fall of the weight due to the magnetic force generated by the permanent magnet holder 14, and falls into the recess 13a of the weight catch holder 13 when the power supply to the permanent magnet holder 14 is cut off, and the wedge members 21 are strongly pressed by the inner periphery of the recess 13a toward the loose hole 20a side, and the end portions of the wedge members 20 protrude into the loose hole 20a to strongly grip the weight catch bar 17 that has been lifted up together with the weight 3, thereby preventing the rebound of the weight 3.

Industrial applicability

The invention can lift the heavy hammer falling to the pile head to the original height safely and quickly when the quick load test of the pile is carried out according to the axial pressing force of the pile acted on the pile head by the heavy hammer falling to the pile head protruding to the ground surface.

Description of the reference numerals

1. Framework body

1a upper frame

1b support column

2. Upper stand

3. Heavy hammer

4. Heavy hammer lifting rod

5. Heavy hammer lifting jack

6. Joint part

6a cone

7. Heavy hammer chuck

8. Main body of jack

8a piston rod

9. Upper chuck

9a chuck body

9b engagement key

9c jack

9d spring

9e middle rib

9f cone

10. Lower chuck

10a chuck body

10b clamping key

10c jack

10d spring

10e middle rib

10f cone

11. Heavy hammer guiding device

11a guide rail

11b guide roller

12. Heavy hammer capturing device

13. Heavy hammer catching holder

13a recess

13b loose holes

14. Permanent magnet holder

14a loose holes

15. Heavy hammer falling-down preventing limiter

15a loose holes

16. Gate-type frame

16a upper frame

17. Heavy hammer capturing rod

18. Ball body

19. Ball retainer

19a loose holes

20. Part holder

20a loose holes

21. Wedge-like parts.

Claims (5)

1. A rapid load test device for a pile, which confirms the supporting force of the pile according to the axial pressing force acted on the pile head by a weight falling down to the pile head,

the rapid load test apparatus of the pile is characterized in that,

the quick load test device for the pile comprises: a frame body erected near the pile head; a weight lifting jack which is arranged on the framework body and lifts the weight falling to the pile head to the original height through a weight lifting rod; a weight holding chuck for detachably hanging the weight at the end of the weight lifting rod; and a guide device for guiding the weight,

the weight lifting jack is provided with: a jack body for lifting the weight; and upper and lower chucks provided at upper and lower sides of the jack body, respectively, for holding and releasing the weight lifting lever,

the pile rapid load test device is configured such that the upper chuck holds the weight lifting rod when the weight lifting jack lifts the weight, the lower chuck releases the weight lifting rod, and the lower chuck holds the weight lifting rod when the upper chuck releases the weight lifting rod and descends with the contraction of the weight lifting jack.

2. A rapid load testing apparatus for piles according to claim 1, wherein,

the rapid load test device for piles is provided with a weight capturing device for capturing the weight which is jumped up at the pile head in the air.

3. A rapid load testing apparatus for piles according to claim 1, wherein,

a plurality of sections are provided at equal intervals along the axial direction of the weight lifting rod on the outer periphery of the weight lifting rod.

4. A rapid load testing apparatus for piles according to claim 3,

the rapid load test device for piles is provided with a weight capturing device for capturing the weight which is jumped up at the pile head in the air.

5. A rapid load testing apparatus for piles according to any of claims 1 to 4,

the quick load test device for piles is provided with a remote device for remotely operating the weight lifting jack and the weight holding chuck.