KR100779486B1 - Apparatus and method for dynamic pile load test - Google Patents

Abstract

An apparatus and a method for testing dynamic pile load are provided to measure various data according to the depth of the ground by using a measurement gauge inserted into a pile below the ground. An apparatus for testing dynamic pile load comprises a drop hammer(100) having at least one mat(112), and a main frame(310) that receives the head of a pile. A hydraulic device(200) fixes/releases the drop hammer(100) at/from a predetermined position spaced apart from the head of the pile by a certain interval by using oil pressure. The hydraulic device(200) is fixed at a certain height by the main frame(310). The drop hammer(100) is obtained by stacking flat mats. The mat has a flat rectangular shape and has guide grooves at the central portions of each side thereof. Guide rails(331) are installed at the four sides of the drop hammer(100) to guided a drop path of the drop hammer(100).

Description

Pile load test device and test method {Apparatus and Method for Dynamic Pile Load Test}

1 is a view showing a pile load test apparatus using a drop hammer generally used by the prior art,

Figure 2 is a perspective view showing the shape of the ram constituting the drop hammer according to an embodiment of the present invention,

Figure 3 is a perspective view of the rod hydraulic device on both sides according to an embodiment of the present invention,

4 is a cross-sectional view taken along the line A-A of FIG.

5 is a perspective view showing a rod hydraulic pressure device according to another embodiment of the present invention,

6 is a perspective view showing a pile load test apparatus having a hydraulic apparatus according to the present invention,

7 is a view briefly showing a state in which the measuring gauge is embedded in the pile of a predetermined depth below the ground surface in accordance with the present invention.

<Explanation of symbols for the main parts of the drawings>

10: pile 20: guide pipe

30: drop hammer 40: crane

50: measuring gauge 60: measuring gauge

100: drop hammer 112: ram

113: guide groove 114: center hole

115: assembly hole 116: assembly rod

117: nut 118: moving handle

119: jam hole 121: jam handle

200: hydraulic system 210: hydraulic cylinder

211: load 212: road plate

213: jam bar 214: sliding plate

215: reinforcement angle 216: reinforcement plate

217: through hole 310: mainframe

311: horizontal steel 312: vertical steel

320: fixed base 321: fixed plate

322: height adjustment rod 323: fixed frame

331: guide rail 341: main supporting steel

342: hydraulic device supporting steel 343: connecting rod insertion hole

344: connecting rod 345: hook

346: nut

The present invention relates to a pile load test apparatus and a test method thereof. More specifically, by including at least one ram is laminated and coupled to the drop hammer, the guide rail for guiding the drop path of the drop hammer and a hydraulic device for fixing and unlocking the drop hammer at a predetermined height by using hydraulic pressure, It is easy to change the load of the drop hammer as a prefabricated type and to control the dropping position of the drop hammer precisely, and it is related to the pile load test device without eccentricity, and it also embeds the measuring gauge inside the pile of the predetermined depth below the ground surface. It relates to a pile load test method that can analyze the characteristics according to.

In recent years, the use of piles has increased in the form of deep foundations as the size of building structures grows and the development of soft ground. Since the piles are subjected to the total load of building structures, the allowable bearing capacity of pile foundations is calculated for the safety of structures. How to do it is very important.

There are many ways to calculate the allowable bearing capacity of pile foundations, but the pile loading test method is generally used as the most reliable method. The pile loading test method is a test to find the magnitude of load that can be supported within the pile's ultimate load or allowable settlement by applying a load after placing the pile. It can be divided into static load test and dynamic load test.

Static load test is expensive and time-consuming by installing the loading device on the pile head, applying 2 ~ 3 times the design load on the loading device, and calculating the ultimate load and bearing capacity by measuring the load and settlement. On the contrary, the dynamic load test measures the bearing capacity of the pile by measuring and analyzing the stress wave generated by hitting the pile head through the pile steering analyzer, which can save various test data and time.

Due to the simplicity of the load test, recently, the test load method is mainly used. In the procedure of the test load method, first, after arranging the head to smoothly arrange the head of the pile so as to be evenly impacted during the driving, the measuring gauge is applied to the pile. And install equipment such as a driving analyzer. The test is then completed by analyzing the data obtained by placing the hammer in the driving equipment and hitting the pile with the hammer.

Types of hammers used during the dynamic load test are diesel hammers, hydraulic hammers, and steam hammers. In general, easy drop hammers are generally used. It is the principle of hitting the pile by lowering it. In this case, when the diameter of the pile is small, the equipment for dropping the hammer or the hammer was simple and small. However, in recent years, the diameter of the pile is increased and the size of the drop hammer and the driving equipment are increased according to the trend of increasing the size of the building structure. There is a lot of development for them.

1 is a view showing a pile load test apparatus using a drop hammer generally used by the prior art.

The pile load test apparatus according to the prior art is connected to the ring by the heavy equipment 40 such as a crane so that the drop hammer 30 is located on the upper portion of the predetermined height from the pile 10 placed in the ground, the head is arranged, A guide pipe 20 for guiding the drop hammer 30 is provided on the top of the pile 10 to surround the outer circumferential surface of the drop hammer 30 so as to accurately hit the pile when the drop hammer 30 falls for driving. do.

In addition, the measurement gauge 50 is attached to the outer peripheral surface of one side of the pile at a predetermined height point from the ground surface, the measurement gauge 50 is generally used as a pair of strain gauge and acceleration gauge.

The drop hammer 30 is made of a cylindrical one-piece type and has various sizes and weights according to the needs of the load test. Therefore, the driving operation is performed by selecting the standard of the drop hammer 30 according to the size and the degree of the load of the pile 10, by connecting the drop hammer 30 to the ring by heavy equipment 40 such as a crane The driving operation proceeds in such a way that the drop hammer 30 is freely dropped through the operation of the heavy equipment 40 and the center portion of the pile head is hit. At this time, the drop hammer 30 passes through the guide pipe 20 and falls to the center of the pile head to strike the pile 10.

In this way, the shock wave transmitted to the pile is measured through a gauge attached to the pile, and the allowable bearing capacity of the pile and the ground is analyzed and calculated by a drive analyzer. In brief, the method of analysis of the analysis using the rudder analyzer is the traditional method of the analysis based on the dynamic bearing capacity, and recently, the wave that can obtain more accurate data by modeling the ground condition around the pile and the pile in detail Driven analysis and case methods based on equations are used. Therefore, input the initial data such as the gauge attachment position and the penetration depth of the pile into the drive analyzer before the load test, and perform the drive analysis accordingly.

The result of the driving analysis changes according to the speed of compression deformation according to the propagation of the driving stress generated from the pile head and the reflection speed from the tip of the pile, that is, the speed of the shock wave. The velocity of the shock wave is also affected by the frictional force of the ground against the pile, and the ground into which the pile is infiltrated is generally distributed with varying ground characteristics.

In the conventional load test method according to the prior art, since the attachment position of the gauge 50 is only attached to the upper part of the predetermined height from the ground surface, only data on the average value up to the pile tip are obtained with respect to the velocity of the shock wave and the corresponding data. Therefore, it was not possible to know the characteristics according to the depth of the ground into which the pile was penetrated, and accordingly, there was a problem that it was difficult to predict the allowable bearing capacity of the pile according to the ground even for some of the same type of ground as the tested ground.

On the other hand, the load test as described above may be repeated two or three times the driving operation and analysis work or by changing the load of the drop hammer, depending on the purpose of the test, the repeated load test device according to the prior art is the pile hammer test device In the case of the repeat test as described above, the drop hammer had to be replaced every time, and there were inconveniences of having to provide drop hammers of various sizes up to several tons for each pile loading test.

In addition, since the drop hammer falls along the inner circumferential surface of the guide pipe, friction between the inner circumferential surface of the guide pipe and the drop hammer is likely to occur, and accordingly, the drop hammer is eccentric and falls, or the amount of impact applied to the pile due to a drop in the falling speed due to frictional force. The smaller than the set amount has a problem of low impact efficiency, it is difficult to accurately analyze the data according to the eccentric drop of the drop hammer, there was a problem that can be cracked or broken in the drop hammer or pile. In addition, since the drop method by the user operation of heavy equipment such as a crane is not an instantaneous operation method that is mechanically controlled, there is a problem that the impact amount is not uniform according to the user's operation state.

Therefore, the present invention has been invented to solve such a problem, at least one ram is laminated and coupled to the drop hammer and the guide rail for guiding the drop path of the drop hammer and the drop hammer fixed to a predetermined height using hydraulic pressure And a hydraulic device for releasing the lock, it is possible to easily change the load of the drop hammer in a prefabricated manner, to control the drop position of the drop hammer accurately, and to provide a pile load test device that does not cause eccentricity. In addition, by embedding the measurement gauge in the pile of a predetermined depth below the ground surface, it is an object of the present invention to provide a pile loading test method that can analyze the characteristics according to the depth of the ground into which the pile is inserted.

In order to achieve this object, the present invention provides a pile loading test apparatus, characterized in that in the pile loading test apparatus using a drop hammer, comprising a drop hammer consisting of at least one ram. In addition, the guide rail for guiding the drop path of the drop hammer, and a pile load test device, characterized in that it further comprises a hydraulic device for fixing and releasing the drop hammer from the pile head to the upper vertical height by using a hydraulic pressure To provide.

The drop hammer is preferably in the form of a rectangular flat plate ram is formed by laminating a guide groove formed in each side center portion, the guide rail is located in front, rear, left and right of the drop hammer.

The apparatus may further include a main frame to which the guide rail is attached, and the hydraulic device is fixed at a predetermined height by the main frame. The hydraulic device includes a hydraulic cylinder in which the rod reciprocates to both sides; A rod plate attached to the rod end; And a locking bar attached to the rod plate, wherein the drop hammer is provided with a locking handle at an upper portion thereof, and the drop hammer is coupled to and coupled to the hydraulic device by inserting and removing the locking bar into the locking handle by hydraulic pressure. It is desirable to be released.

In addition, the present invention in the pile load test method for analyzing the data through the measurement gauge with a steering analyzer, the measurement gauge is embedded in the pile of a predetermined depth below the ground surface and characterized in that the load test using the pile load test device It provides a pile load test method.

At this time, the pile is cured in a state where the measuring gauge is located at a predetermined depth, a plurality of measuring gauges are embedded and each of the embedding depths are embedded differently, and the measuring gauge preferably has a waterproof function.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Figure 2 is a perspective view showing the shape of the ram constituting the pile loading test apparatus according to an embodiment of the present invention.

The drop hammer 100 to be driven in the center of the pile head is not formed integrally, but at least one ram 112 of the same shape is assembled, each ram 112 is a square plate shape of the central portion of each side Guide grooves 113 are formed in the grooves. A center hole 114 is formed at the center of the ram 112 and two assembly holes 115 are formed on both sides of a predetermined distance from the center, and two or more assembly holes 115 may be formed. .

Two assembly holes 115 are inserted into the assembly rod 116 is formed with a screw thread and a plurality of laminated ram 112 can be coupled by fastening the nut 117 at both ends of the assembly rod 116, assembly rod At the top of the 116, it is preferable that the movement handle 118 is fastened so that the plurality of coupled rams 112 can be connected to and moved by the hook of the crane. The movable handle 118 is formed in a cylindrical shape with a lower portion thereof, and an upper portion thereof is inclined to have a flat plate shape with a locking hole 119 formed therein, and a groove formed with a female thread on an inner circumferential surface thereof is formed at the lower surface thereof. ) Is combined with the structure.

The assembly rod 116 is also inserted into the center hole 114 formed in the center of the ram 112, and the nut 117 is fastened to the lower end of the assembly rod 116, and the locking knob 121 is fastened to the upper edge of the assembly rod 116. ) Is formed in the same shape as the movable handle 118, it is preferably formed to be longer than the movable handle 118. Therefore, a locking hole 119 is also formed in the upper portion of the locking handle 121, through which the locking bar of the hydraulic device to be described in FIGS. 3 and 4 is inserted or released.

The shape of the moving handle 118 and the locking handle 121 is assumed to be a flat plate shape, but may be formed in the same shape as the lower portion. In addition, the shape of the ram 112 may be variously formed in addition to the square plate, such as a triangular plate, a disc shape, the number and position of the guide groove 113 may also be variously changed according to the shape of the ram 112.

Figure 3 is a perspective view showing a two-side rod hydraulic apparatus according to an embodiment of the present invention, Figure 4 is a cross-sectional view taken along the line AA of Figure 3, Figure 5 is a side rod according to another embodiment of the present invention A perspective view of a hydraulic device.

In the hydraulic apparatus according to the present invention, the double hydraulic cylinders 210 in which the two rods 211 are reciprocated to both sides of each cylinder 210 are positioned parallel to each other at a predetermined interval, and each hydraulic cylinder 210 is The rod plates 212 are attached to the ends of the rods 211 on both sides, respectively, and the reciprocating motion of the rod plates 212 is simultaneously performed by two hydraulic cylinders 210 positioned in parallel. In addition, two sliding plates 214 on which the engaging bars 213 are attached to the central inner surface of each of the rod plates 212, and the through holes 217 for supporting the engaging bars 213 are formed, are provided with two cylinders 210. ) And each of the two cylinders 210 at right angles to each other is positioned parallel to each other, such that the engaging bar 213 reciprocates by the hydraulic pressure of the two cylinders 210 acting simultaneously and penetrates the sliding plate 214. The structure passes through the hole 217. That is, the rod 211 on both sides of the cylinder, the rod plate 212 and the locking bar 213 is a structure that reciprocates integrally by two hydraulic cylinders 210 in parallel, the center between the rod plate 212 It forms a symmetrical shape based on.

In this case, as shown in FIG. 4, each of the engaging bars 213 is inserted into and released from the sides of the engaging holes 122 of the engaging holes 122 of the engaging handle 121 described with reference to FIG. The gap between the sliding plates 214 is positioned and fixed so as not to be smaller than the thickness of the upper part of the locking handle 121 so that the upper portion of the locking handle 121 in which the 122 is formed may be inserted between the sliding plates 214. In addition, the engaging bar 213 supporting through hole 217 formed in the sliding plate 214 is formed so that the inner circumferential surface of the through hole 217 is made to slide by surface contact with the outer circumferential surface of the engaging bar 213, and the sliding It is preferable to lubricate the friction surface with a structure that can inject grease into the sliding plate 214 to prevent friction during the process.

In addition, in order to reinforce the above structure, further provided with a reinforcement angle 215 that both sides of the rod plate 212 in contact with the longitudinal direction of the cylinder 210, the sliding plate 214, the rod plate 212 and the reinforcement The reinforcing plate 216 may be padded on the bottom surface of the angle 215.

Meanwhile, as another embodiment of the present invention, as shown in FIG. 5, only one side of the hydraulic cylinder 210 may be configured as a hydraulic device in which the rod 211 reciprocates. In this configuration, since there is no symmetrical structure, only one rod plate 212, sliding plate 214, and one locking bar 213 are provided, and one locking bar 213 is reciprocated so that the locking handle 121 is provided. Is inserted into and released from the engaging hole 122. The structure of the hydraulic cylinder 210 and the structure inserted into the locking hole 122 are simple and easy to manufacture and use. However, when the locking bar 213 is released from the locking hole 122 by hydraulic pressure, the locking handle ( 121) and the center of the ram 112, the eccentric is generated to fall, so as shown in Figure 3 it is preferable to have a structure that is released from both sides at the same time.

In addition, since the hydraulic cylinder 210 according to the present invention illustrated in FIGS. 3 and 4 is a general hydraulic cylinder 210 used by a known technique, a detailed description thereof will be omitted.

6 is a perspective view showing a pile load test apparatus having a hydraulic apparatus according to the present invention.

The test apparatus according to the present invention includes a main frame 310 having a rectangular horizontal cross section capable of accommodating a pile head, which is a test load, and a base for supporting the main frame 310 on the ground. 320 is provided.

The main frame 310 is a rectangular parallelepiped steel structure composed of four vertical steel 312 and a plurality of horizontal steel 311 which are horizontally connected to adjacent vertical steel 312, respectively, and four vertical steel 312. Fixtures 320 are positioned at the bottom of each. Fixing plate 320 is a fixed plate 321 is in direct contact with the lower portion of the vertical steel 312, the height adjusting rod 322 is attached to the lower portion of the fixing plate 321 and the height adjustment rods are formed on the outer peripheral surface, and the fixing plate 321 ) And a fixed frame 323 supporting the height adjusting rod 322 is a structure that can be adjusted independently of each other. In addition, the height adjusting means of the fixing unit 320 may be configured in various ways other than the height adjustment rod 322 is formed threaded.

On the other hand, four guide rails 331 are attached to the inner center of the horizontal steel 311 in the vertical direction, the guide rail 331 can be used as a section steel of various cross-sectional shape as long as a straight line is maintained along the entire length direction. In one embodiment of the present invention, as shown in FIG. However, the guide rail 331 is inserted into the guide groove 113 formed on the side of the assembling ram 112 described in Figure 2 serves to guide the falling path of the ram 112 of the guide rail 331 It is preferable that the cross-sectional shape and the cross-sectional shape of the guide groove 113 formed in the ram 112 correspond to each other. In addition, the distance between the outer surface of the mutually opposing guide rail 331 is formed to be greater than or equal to the distance between the inner surface of the mutually opposing guide groove 113 formed in the ram (112).

The main supporting steel 341 is seated while crossing the central portion of the horizontal steel 311 facing the top of the main frame 310, and connecting rod insertion holes 343 are formed at both sides of the main supporting steel 341. In addition, the lower surface of the hydraulic device 200 is provided with a hydraulic device supporting steel 342 on which the hydraulic device 200 can be seated and attached and fixed to the hydraulic device 200, and both sides of the hydraulic device supporting steel 342. The connecting rod insertion hole 343 is also formed in each part. The connecting rods 344 each having a thread are inserted into the connecting rod insertion holes 343 formed in the main supporting steel 341 and the hydraulic apparatus supporting steel 342, respectively, and coupled to each other by a nut, thereby providing the hydraulic apparatus 200 with the main supporting steel ( 341) is supported.

Looking in more detail, the hook 345 is formed on the upper end of the connecting rod 344 and the thread is formed on the outer circumferential surface of the connecting rod 344 for the entire length, and nuts 346 on the upper and lower portions of the connecting rod 344, respectively. ) To connect the main support steel 341 and the hydraulic support steel (342). Therefore, it is possible to adjust the height from the ground of the hydraulic device supporting steel 342 according to the fastening position of the nut 346 to the connecting rod 344. That is, when the fastening position of the nut 346 is changed from the upper portion of the connecting rod 344 to the middle portion of the connecting rod 344, the hydraulic device supporting steel 342 is raised from the ground by the amount of change in the nut fastening position. When the nut 346 fastening position is changed, the nut fastening position may be changed after raising the connecting rod 344 with heavy equipment by using the hook 345 formed at the upper end of the connecting rod 344.

Since the ram 112 is coupled to the hydraulic device 200 as shown in FIG. 4, the height of the ram 112 is precisely raised by the height adjusting structure of the hydraulic device 200 by the connecting rod 344 as described above. Or it can be lowered, pile loading test apparatus according to the present invention is a structure that can be precisely controlled the position of the drop hammer 100 consisting of a ram (112).

As described above, the pile loading test apparatus according to the present invention has a structure in which the driving position is firmly fixed by the combination of various frames, sections, and rods, and precise position control is possible.

In addition, look at the driving operation state of the drop hammer 100, the position of the ram 112 is fixed as described above to be located above the predetermined height from the pile head, the hydraulic pressure of the ram 112 coupled to the hydraulic device 200 By disengaging from the device 200, it falls in the vertical direction. At this time, looking at the process of the ram 112 is released from the hydraulic device 200, by supplying the hydraulic pressure to the hydraulic cylinder by a separate hydraulic supply device (not shown) as described in Figure 3 of the hydraulic device 200 As the locking bar is inserted into and released from both sides of the locking hole at the upper portion of the locking handle of the ram 112, the ram 112 is vertically dropped without being eccentric. While the ram 112 falls, the drop path is guided by the guide rail 331. Since the ram 112 falls without being eccentric, the friction with the guide rail 331 occurs less and the four guide rails 331 Since the contact surface with the ram 112 is reduced as compared with the conventional guide pipe because it is guided by), friction is significantly reduced accordingly.

In addition, when the load of the drop hammer 100 including the ram 112 is to be repeatedly changed and the driving test is required or the load of the drop hammer 100 is changed for accurate data, the ram 112 is added. It can be easily combined by the assembly rod, and can accurately control the rudder position of the drop hammer 100, it is possible to test by various impact strength.

7 is a view briefly showing a state in which the measuring gauge is embedded in the pile of a predetermined depth below the ground surface in accordance with the present invention.

As described in the prior art, the measuring gauge 50 is attached to the pile outer surface of a predetermined height from the buried ground surface, and in the pile loading test method according to the present invention, in addition to the plurality of measurements from the ground surface inside the pile of a predetermined depth Gauge 60 is attached.

There are many ways to bury the pile 10 in the ground, but when the existing pile is buried in the ground by the drilling method, vibration and noise pollution occurs, so in recent years excavated pile holes in the ground and excavated piles The method of embedding piles by inserting reinforcing bars to reinforce the structure and curing by pouring concrete is used.

In this case, the method of embedding the measuring gauge 60 inside the pile of a predetermined depth from the ground surface is performed by attaching the measuring gauge 60 to the reinforcing bars, inserting them into the pile holes, and pouring concrete to cure the resin. By adjusting the position to be able to adjust the embedding depth of the measurement gauge 60 according to the needs of the user. In addition, at this time, it is preferable that the measurement gauge 60 has a waterproof function so that normal operation is performed after curing of concrete.

In this process, as shown in FIG. 7, when the plurality of measurement gauges 60 are variously embedded at predetermined depths, the data measured from the respective measurement gauges 60 is attached to the measurement gauge 50 attached to the ground surface. Including each other. Accordingly, the ground characteristics and the corresponding frictional characteristics in the first to third sections shown by arrows in FIG. 7 from the data of the respective measuring gauges 60 can be analyzed by a steering analyzer, and the data are compared with each other. It is also possible to grasp the characteristics of the ground for each section between the measurement gauges 60. Thus, by embedding the measurement gauge 60 in the pile of a predetermined depth below the ground surface and using the pile load test apparatus according to an embodiment of the present invention described above, a more accurate test is possible.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, a pile load test apparatus including a prefabricated drop hammer, a separate guide rail having a small contact area with the drop hammer, and a hydraulic device for accurately dropping the drop hammer without eccentricity by hydraulic pressure. It is easy to change the load of the drop hammer and reduce the occurrence of eccentricity when the drop hammer falls, thus preventing the loss of the impact amount by friction, so that it is possible to easily carry out the load test of the pile and obtain accurate test data. It works. In addition, it is possible to measure various data according to the depth of the soil by embedding the measuring gauge inside the pile of predetermined depth below the ground surface, so that accurate and analytical pile loading test can be performed by evaluating the allowable bearing capacity and frictional force according to the characteristics of the ground. It works.

Claims (13)

In the pile load test apparatus using a drop hammer, A drop hammer consisting of at least one ram; A main frame for accommodating pile heads therein; And Hydraulic device for fixing and releasing the drop hammer on the vertical vertical height from the pile head using the hydraulic pressure To include, wherein the hydraulic device is a pile loading test device, characterized in that fixed to a predetermined height by the main frame. The method of claim 1, The drop hammer is pile loading test device, characterized in that the form of a lamination is coupled to the flat ram. The method of claim 2, The ram is a rectangular flat load test device, characterized in that the guide groove is formed in each side central portion. The method of claim 1, Pile loading test device, characterized in that it further comprises a guide rail for guiding the drop path of the drop hammer. The method of claim 4, wherein The guide rail is pile loading test apparatus, characterized in that located in front, rear, left and right of the drop hammer. delete delete The method according to any one of claims 1 to 5, The hydraulic device A hydraulic cylinder in which the rods reciprocate to both sides; A rod plate attached to the rod end; And And a locking bar attached to the road plate, The drop hammer is provided with a locking handle on the top And the drop hammer is coupled to and released from the hydraulic device by the locking bar being inserted into and released from the locking handle by hydraulic pressure. The method according to any one of claims 1 to 5, Further comprising a support for supporting the main frame from the bottom The fixture is pile load test device, characterized in that the height can be adjusted. In the pile load test method for analyzing the data through the measuring gauge with a steering analyzer, The measuring gauge is embedded in the pile of a predetermined depth below the ground surface and the pile load test method characterized in that the load test using the pile load test device of claim 1. The method of claim 10, Pile load test method, characterized in that the pile is cured in a state that the measuring gauge is located at a predetermined depth. The method of claim 10, Pile test load method characterized in that the plurality of measuring gauges are embedded and each of the purchase depth is embedded differently The method according to any one of claims 10 to 12, The measuring gauge is pile load test method characterized in that it has a waterproof function.

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