KR20050002682A - Road-cell, apparatus for testing bearing power of subterranean concrete pile and method for testing bearing power using the same - Google Patents

Abstract

PURPOSE: A load cell and an apparatus and a method for measuring a bearing force are provided to measure the bearing force and a peripheral frictional force in a small ground load by using a cylinder. CONSTITUTION: An apparatus for measuring a bearing power includes an upper plate(100) and a lower plate(200). At least two cylinders(300) are aligned with a uniform interval by uniformly supplying a pressure to a lower surface of the upper plate(100) and an upper surface of the lower plate(200). A displacement measuring device(400) measures a displacement of the upper plate(100) and the lower plate(200). At least one penetration hole is formed at the upper plate(100) and the lower plate(200). The upper plate(100) and the lower plate(200) are formed with perforated holes extending in a downward direction.

Description

Tip load measuring device, support load measuring device and measuring method for concrete piles laid on ground {Road-cell, apparatus for testing bearing power of subterranean concrete pile and method for testing bearing power using the same}

The present invention relates to a tip force measuring device using the principle of the load cell (cell) and a support load measuring device and measuring method of the underground ground using the same, more specifically, can be used a pressure loading device having a small capacity, pressure Not only can it be repeated the loading device operation more easily, but it can also measure the small size of the ground bearing force and the friction of the main surface, and it is the tip force measuring device configured to distribute the concrete evenly to every corner of each part and the supporting load using the same It relates to a measuring device and a measuring method.

Several theoretical and empirical methods have been proposed for estimating the bearing capacity and settlement of pile foundations. The method of determining the ultimate vertical bearing capacity of the pile currently in use includes estimation of pile load test, static and dynamic load test, dynamic load test, static bearing capacity formula, dynamic bearing formula, field test results, empirical formula, wave equation, pile analysis code, etc. The estimation of pile static test is the most reliable among these methods.

The pile static load test is a kind of physical test that has a high reliability because it reproduces when the actual superstructure is constructed by applying a real load to the pile. However, there is a lot of constraints such as air and field conditions because the selection and installation method of the pressurization and reaction system for the load load and the wide test site are necessary. In addition, large diameter cast-in-place piles have very high loads on one pile, and if the bearing capacity does not reach the design value due to construction defects, it has a fatal effect on the usability and stability of the whole structure. In addition, by drilling on the ground at the site and curing by pouring concrete, large changes in the bearing capacity of the site-placement pile may occur due to careless or unexpected changes in the ground conditions during the construction process. Therefore, when designing using the design allowable load estimated from the soil condition based on the soil condition, the designers have no choice but to conservatively design, which is a big waste in the national level.

In order to solve this problem, a high-pressure hydraulic jack is installed in the pile to provide a mutual support force for the loading by the tip bearing force and the principal friction of the pile generated by the load, so that a large load capacity such as the pile static load test can be achieved. Unnecessary, no separate loading and reaction devices are required, and a support load measuring device (US 5,576, 494) using an Osterberg cell has been devised that can be applied in narrow test spaces or inclined areas.

Hereinafter, a support load measuring apparatus using a conventional osterberg cell will be described with reference to the accompanying drawings.

1 illustrates a shape in which concrete is poured after a support load measuring apparatus using a conventional osterberg cell is drawn into the ground.

As shown in FIG. 1, a conventional support load measuring apparatus includes a flat plate-shaped upper plate 10 and a lower plate 20 and an upper surface of a piston 32 and a lower plate 20 which are in contact with the bottom surface of the upper plate 10. The connecting member for coupling the upper plate 10 and the lower plate 20 by welding the cylinder 30 consisting of the body 34 in contact, and both ends are welded to the lower surface of the upper plate 10 and the upper surface of the lower plate 20, respectively ( 40 and an osterberg cell including a displacement meter 50 for measuring the displacement of the upper plate 10 and the lower plate 20. The displacement meter 50 includes an upper plate displacement meter 52 fixedly coupled to the upper plate 10 to measure the displacement amount of the upper plate 10, and a lower plate displacement meter fixedly coupled to the lower plate 20 to measure the displacement amount of the lower plate 20 ( 54); The reference beam 60 is further provided to be fixed to the ground so that the upper plate displacement meter 52 and the lower plate displacement meter 54 are referred to as the vertical distance reference.

At this time, the cylinder 30 is an oil cylinder configured to reciprocate the piston 32 through the inflow and outflow of oil.

In addition, the hole into which the Osterberg cell is inserted, because the bottom surface is not formed flat due to various gravel and foreign matter, the base concrete (F) of the predetermined amount is laid in advance so that the lower plate 20 can be fixed in a horizontal manner. .

FIG. 2 illustrates a shape in which the piston is drawn out in the state shown in FIG. 1.

When the hydraulic pressure is applied to the cylinder 30 in the state shown in FIG. 1, the piston 32 is drawn out of the body 34, and the upper plate 10 and the lower plate 20 are fixedly coupled by the connecting member 40. Is not moved. When the output force of the piston 32 is increased and the coupling of the connecting member 40 is broken, the lower plate 20 moves downward to generate the tip bearing force, and the upper plate 10 moves upward with the same force, thereby increasing the concrete pile ( When given to P), friction is generated.

In addition, since the load is applied at the tip or any other position other than the head of the concrete pile (P), the principal surface friction force and the tip bearing force act as a reaction force against each other. Therefore, the support load measuring apparatus using the osterburk cell can measure the support load without a separate load carrying device.

However, in the support load measuring apparatus installed in the above structure, the foundation concrete (F) placed on the bottom surface of the hole is cured to have a certain size or more rigid, and then seats the Osterberg cell, the seating of the Osterberg cell Since it is necessary to pour concrete to form the concrete pile (P) after completion, there is a disadvantage that takes a very long time to measure the load.

In addition, the foundation concrete (F) and concrete pile (P), even if made by pouring the same concrete will have different sizes of strength because the timing and curing time is different. Therefore, the concrete pile (P) used in the experiment may be different from the concrete pile used in the actual construction site and the tip bearing force and the principal surface friction, there was a problem that the conventional support load measuring device is less reliable.

In addition, the concrete pile used in the actual construction site is used reinforced concrete piles with the reinforcement is inserted inside, the conventional support load measuring device can measure only the support load of the concrete pile (P) without the reinforcement is inserted There was this.

Figure 3 is a graph showing the displacement of the upper plate and the lower plate according to the withdrawal load of the piston when measuring the support load using a conventional support load measuring device.

Since the entire load of the cylinder 30 applied to the conventional Osterberg cell is all applied to the lower plate 20, the connecting member 40 coupling the lower plate 20 to the upper plate 10 is not only a load of the lower plate 20. It is firmly coupled to withstand the load of the cylinder 30 (see Fig. 1).

Therefore, in the conventional support load measuring apparatus using the osterberg cell as described above, as shown in Figure 3, the upper plate and the lower plate does not move as soon as the hydraulic pressure is applied so that the piston is drawn out, and the upper plate until the coupling member is disconnected The position of the lower plate is fixed as it is, and the displacement occurs only after the hydraulic pressure is applied to the cylinder of a certain size is disconnected from the connection member. Therefore, when using a conventional support load measuring apparatus, there is a disadvantage that the tip bearing force and the principal surface friction force when a small load is loaded cannot be measured.

In addition, when the concrete pillar used for measurement is applied very large, the cylinder should be made large to lift the concrete pillar, there is a technical problem to produce a large cylinder as well as a high production cost problem There was this.

In addition, since the load of the cylinder is applied so as to be concentrated only at the center of the upper and lower plates, it is difficult to obtain accurate measurement values, and even if oil is drawn out of the cylinder after the piston is drawn out of the body, the piston does not enter the body, so And it is impossible to repeat the principal friction measurement test, and the upper and lower plate displacement meters are mounted so as to be in direct contact with the concrete, so that friction force is generated between each displacement gauge and the concrete, so that accurate measurement is difficult, and after the expansion of the osterberg cell, the concrete pile ( P) There is a problem that the concrete pile (P) subjected to the support load measurement can not be used as a foundation pile, because the gap is generated at the lower end to reduce the strength.

The present invention has been made in order to solve the above problems, it is possible to measure the tip bearing force and the main surface friction force even under a small load, the point where the concrete pile (P) of a large load is buried by using a commonly used cylinder It is an object to provide a tip force measuring device that can measure the tip bearing force and the principal surface frictional force, it is possible to repeat each of the above measurements.

In addition, the present invention is configured so that no other external force is applied to each displacement meter, so that more accurate measurement is possible, and the support is configured to be able to pour concrete into the gap generated at the lower end after the end support force and the principal surface friction force measurement are completed. An object is to provide a load measuring device and a measuring method.

1 illustrates a shape in which concrete is poured after a support load measuring apparatus using a conventional osterberg cell is drawn into the ground.

FIG. 2 illustrates a shape in which the piston is drawn out in the state shown in FIG. 1.

Figure 3 is a graph showing the displacement of the upper plate and the lower plate according to the withdrawal load of the piston when measuring the support load using a conventional support load measuring device.

4 shows an internal configuration of a support load measuring apparatus according to the present invention.

5 is a perspective view of a tip force measuring device according to the present invention.

6 is a cross-sectional view taken along the line A-A shown in FIG. 5.

7 is another embodiment of the tip force measuring device according to the present invention, Figure 8 is a cross-sectional view taken along the line B-B shown in FIG.

9 is another embodiment of the tip force measuring device according to the present invention.

10 illustrates a shape in which the lower plate steel bar is coupled to the lower plate 200.

11 is another embodiment in which the lower plate steel bar is coupled to the lower plate 200.

12 illustrates a shape in which the upper steel bar is coupled to the upper pipe.

FIG. 13 illustrates a shape in which a sensor wire protective cover is mounted to protect a sensor wire in a portion where a margin is formed.

14 to 16 sequentially show the shape in which concrete is poured into the support load measuring apparatus shown in FIG.

FIG. 17 illustrates an inflated tip force measuring device in the state shown in FIG. 16.

18 is a graph showing the displacement of the upper plate and the lower plate according to the withdrawal load of the piston when measuring the support load using the support load measuring apparatus according to the present invention.

19 is a flow chart of the support load measuring method according to the present invention.

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

100: top plate 110: connecting member

200: lower plate 210: support leg

300: cylinder 310: body

320: piston 400: displacement measuring means

410: electric resistance automatic displacement meter 420: plate displacement meter

422: top pipe 424: top steel bar

430: lower plate displacement meter 432: lower plate pipe

434: lower plate steel bar 440: displacement data processing unit

500: reference beam 600: transition measuring means during celebration

610: sensor in celebration 700: rebar

710: vertical rebar 720: horizontal rebar

730: shear reinforcement 800: funnel

Load cell according to the present invention for solving the above problems, the upper plate and the lower plate, two or more cylinders coupled to be arranged at equal intervals between the upper plate and the lower plate, and one or more connecting members for coupling the lower plate to the upper plate, And displacement measuring means for measuring the displacement of the upper plate and the lower plate.

The cylinder includes a body having an outer end fixedly coupled to the bottom of the upper plate, and a structure capable of drawing in and out of the body and having an outer end coupled to the upper surface of the lower plate. Therefore, both ends of the connecting member are coupled to the upper and lower plates so as to have strength of a size that can withstand the load of the lower plate.

Displacement measuring means is to measure the displacement of the upper plate, the lower end is coupled to the upper surface of the upper plate, the upper steel bar is introduced into the upper pipe and the lower end is coupled to the upper surface of the upper plate to measure the displacement of the upper plate, the displacement of the upper plate The upper plate displacement meter, the lower end pipe penetrating the upper plate to be in close contact with the upper surface of the lower plate to measure the displacement of the lower plate, the lower plate steel rod which is inserted into the lower plate pipe and the lower end is coupled to the upper surface of the lower plate, and the lower plate steel bar. It consists of a bottom plate displacement meter to measure the displacement.

At this time, the lower plate is fixedly coupled to a portion where the rigid pipe, the inner diameter is formed so that the lower plate pipe can be inserted into the fitting structure is in contact with the lower plate pipe; The lower pipe is joined so that the lower end is inserted into the rigid pipe. In addition, an adhesive having a viscosity is applied to a portion where the rigid pipe and the lower plate pipe are in contact with each other to prevent the concrete from being introduced between the rigid pipe and the lower plate pipe. At this time, the pressure-sensitive adhesive is preferably applied to the silicone having the effect of waterproofing.

In addition, the lower plate pipe may be taped so that the lower end is in close contact with the upper surface of the lower plate.

The upper plate and the lower plate is formed with one or more through-holes through which the concrete can pass downward. At this time, the upper surface of the top plate is further provided with one or more funnels for guiding the transport path of the concrete applied from the upper side to the through hole.

In addition, the lower plate is further provided with a support leg protruding downward so as to be horizontally seated even on a non-flat surface.

The support load measuring apparatus according to the present invention includes a front end force measuring device configured to be expanded in a vertical direction and configured to measure displacement in a vertical direction and seated on a bottom surface of a hole excavated downward; A plurality of reinforcing bars coupled to an upper surface of the tip force measuring device; It is configured to include a axial transition measurement means coupled to the reinforcing bar to measure the friction of the strata.

The in-transit measuring means includes an in-flight sensor coupled to the outer surface of the rebar, sensor wires for signal and current transmission to and from the in-flight sensor, and in-flight data processing apparatus for displaying and storing measured values from the in-flight sensor It is configured to include. At this time, the sensor wire is coupled to allow a margin so as not to be disconnected by the tension.

Reinforcing bars, a plurality of vertical reinforcing bars coupled in a vertical direction to be arranged along the outer side of the tip force meter, horizontal reinforcing bars are combined to surround a plurality of vertical reinforcement in a horizontal direction, and formed to form a polygonal vertical rebar or horizontal It comprises a shear reinforcing bar coupled to the reinforcing bar. At this time, the shear reinforcing bar, it is preferable to combine a plurality at equal intervals in the vertical direction.

The support load measuring method according to the present invention includes a first step of digging a hole in a direction perpendicular to the ground; A second step of seating the tip force meter on the bottom surface of the hole; Inserting a trailing tube to penetrate the tip force measuring device; A fourth step of pouring concrete from the bottom of the hole in which the tip force measuring device is seated through the tremi tube; A fifth step of driving the tip force measuring device to expand the cylinder when curing of the concrete is completed; When the expansion of the cylinder is completed, it consists of a sixth step of measuring the displacement of the upper side and the lower side of the tip force measuring device using the displacement measuring means.

At this time, the second step, the step 2-1 to couple the reinforcing bar to the upper portion of the tip force measuring instrument, the step 2-2 to install the transition measuring means in the reinforcement to the reinforcement, and the tip force provided with the reinforcement and the transition measurement means during Consisting of two to three steps of seating the meter on the bottom surface of the hole; The sixth step further includes a 6-1 step of measuring the frictional force of the strata in contact with the concrete by using the transition measuring means during the celebration.

In addition, the support load measuring method according to the present invention, when the displacement measurement is completed, the seventh step of dismantling the displacement measuring means, and the second concrete placing in the empty space formed in the lower portion of the hole by the expansion of the tip force measuring instrument An eighth step is further included.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the support load measuring device and measuring method of the concrete piles placed on the ground according to the present invention.

4 shows an internal configuration of a support load measuring apparatus according to the present invention.

As shown in FIG. 4, the support load measuring apparatus according to the present invention includes a plurality of cylinders coupled to be arranged at equal intervals between the upper plate 100 and the lower plate 200 and the upper plate 100 and the lower plate 200. 300, one or more connecting members 110 for coupling the lower plate 200 to the upper plate 100, and displacement measuring means 400 for measuring displacement of the upper plate 100 and the lower plate 200. A tip force measuring device configured to; A plurality of rebars 700 coupled to the upper surface of the top plate 100; It is coupled to the reinforcement 700 is configured to include a transition measuring means 600 to measure the frictional force of the strata by measuring the strain of the reinforcement 700 and concrete.

Cylinder 300, the outer end is composed of a body 310 is fixedly coupled to the bottom surface of the upper plate 100, the structure that can be pulled in and out of the body 310, the outer end is the lower plate 200 It is configured to include a piston 320 is coupled to contact the upper surface of the. At this time, the upper plate 100 and the body 310 is coupled to the screw coupling structure to facilitate the design and coupling operation of the coupling force, the lower plate 200, both ends are coupled to the upper plate 100 and the lower plate 200, respectively It is connected to the top plate 100 by 110.

Since the upper plate 100 and the body 310 are fixedly coupled while the lower plate 200 and the piston 320 are simply coupled to maintain contact, the load of the cylinder 300 is directly applied to the upper plate 100.

At this time, the connection member 110 applied to the present invention, like the connection member 40 applied to the conventional support load measuring apparatus need to have a large strength to withstand the load of the cylinder 30 and the lower plate 20 It is sufficient to have a strength of a size that can only withstand the load of the lower plate 200 (see Fig. 1), so that even if the hydraulic pressure applied to pull out the piston 320 is very small, with the upper plate 100 or the lower plate 200 The bond is broken or broken. Therefore, since the displacement of the upper plate 100 and the lower plate 200 is generated from the time when the hydraulic pressure is applied to the inside of the cylinder 300, it is possible to measure a more accurate support load. At this time, the strength of the connection member 110 is preferably designed to the safety factor of about 3 on the basis of the weight of the lower plate 200.

The cylinder 300 is preferably applied to the hydraulic cylinder from which the piston 320 is drawn out by applying hydraulic pressure therein.

The displacement measuring means 400 includes an electric resistance automatic displacement gauge 410 for measuring the displacement between the upper plate 100 and the lower plate 200, and an upper plate displacement gauge 420 for measuring the absolute displacement of the upper plate 100. , A lower plate displacement meter 430 for measuring the absolute displacement of the lower plate 200 is configured. The data measured by the electric resistance automatic displacement meter 410, the top plate displacement meter 420, and the bottom plate displacement meter 430 are transferred to the displacement data processor 440 and automatically calculated and stored, and the bottom plate displacement meter is disposed on the upper portion of the hole where concrete is poured. 430 and the top plate displacement meter 420 are provided with a fixed reference beam 500 to maintain a constant vertical height.

The user can calculate the support load of the ground by measuring the expansion force of the cylinder 300, and by measuring the displacement of the upper plate 100 and the lower plate 200. At this time, the method of calculating the support load of the ground using the expansion force of the cylinder 300 and the displacement of the upper plate 100 and the lower plate 200 is the same as the method of calculating the support load using a conventional Osterberg cell, Detailed description thereof will be omitted.

On the other hand, the upper end of the upper plate 100 is coupled to the lower end of the upper pipe 422 is fixed, the upper plate steel 422 is inserted into the upper plate 422 so that the lower end is fixed to the upper surface of the upper plate 100 Combined. In addition, the upper end of the lower plate 200 is coupled so that the lower end of the lower plate pipe 432 is in contact, the lower plate steel bar 434 is drawn into the lower plate pipe 432 so that the lower end is fixed to the upper surface of the upper plate 100. Combined. The upper plate displacement meter 420 and the lower plate displacement meter 430 measure the heights of the upper plate steel bar 424 and the lower plate steel bar 434 that are introduced into the upper plate pipe 422 and the lower plate pipe 432. In order to determine the displacement of the 200, the upper bar 424 and the lower bar 434 is not in direct contact with the concrete is moved in the vertical direction so that it is possible to more accurately measure the displacement of the upper plate 100 and lower plate 200 do.

Transition measurement means 600 during the celebration, the celebration sensor 610 coupled to the outer surface of the reinforcement 700, the sensor wire 612 for transmitting signals and currents with the celebration sensor 610, and the celebration sensor And a celebration data processing device 620 for displaying and storing the measured values from 610. In order to obtain the distribution of the circumferential surface friction force for each strata by obtaining the distribution during the concrete pile depth, a plurality of sensors 610 during the celebration may be installed to be spaced apart at regular intervals in the vertical direction.

At this time, the sensor wire 612 is coupled to leave a margin so as not to be disconnected by the tension, it is preferable that a portion is coupled to form an 'S' shape as shown in Figure 4 in order to leave such a margin.

In addition, the displacement meter wire 412 for the signal and current transmission with the electrical resistance type automatic displacement gauge 410 is also preferably combined with a margin so as not to be disconnected by tension.

Reinforcement 700 shown in Figure 4 is coupled to be produced as a reinforcement 700 concrete pile when the concrete is poured, a plurality of vertical reinforcing bars are coupled in a vertical direction to be arranged in a circle along the outer side of the top surface of the tip force meter ( 710 and the horizontal reinforcement 720 is coupled to surround the outer circumferential surface of the plurality of vertical rebars 710 in order to increase the fixing and strength of the vertical reinforcement 710.

At this time, since the vertical rebar 710 has a very long length and has a great strength for tensile and compressive loads, it has a disadvantage in that it is easily deformed for torsional loads. Therefore, in order to compensate for such a disadvantage, a shear reinforcing bar 730 is formed to form a polygonal shape and coupled to the vertical rebar 710 or the horizontal reinforcing bar 720 is further provided. When a torsion load is applied to the vertical rebar 710, the shear bar 730 is applied with a tensile or compressive load, thereby enhancing the torsional strength of the entire reinforcement 700. At this time, the shear reinforcing bars 730, it is preferable that a plurality is coupled at equal intervals in the vertical direction.

Since the vertical rebar 710 is not bent due to the shear rebar 730 and maintains the vertical degree, the user adjusts the plurality of vertical rebars 710 to be vertical so that the tip force measuring instrument is horizontally seated on the bottom surface of the hole. You can.

5 is a perspective view of a tip force measuring device according to the present invention, Figure 6 is a cross-sectional view taken along the line A-A shown in FIG.

As shown in FIG. 5, the upper plate 100 and the lower plate 200 to which the present invention is applied are provided with a plurality of through holes 120 and 220 having a shape in which concrete can penetrate downward, and the cylinder 300 includes an upper plate. The 100 and the lower plate 200 are arranged to be equally spaced over the entire area. Since the expansion force of the cylinder 300 is applied evenly over the entire area of the upper plate 100 and the lower plate 200, the displacement amount of the upper plate 100 and the lower plate 200 appears evenly over all points, and accordingly, Support load can be measured.

The tip force measuring device according to the present invention can obtain a large load by increasing the number of cylinders 300 even if the area of the upper plate 100 and the lower plate 200 is increased due to the increase in the holes to which the concrete piles are embedded. There is an advantage that a large capacity cylinder 300 is not required.

In addition, the tip force measuring device according to the present invention, the funnel 800 for guiding the transport path of the concrete applied from the upper side through the through holes (120, 220) is coupled to the upper surface of the top plate (100). Therefore, the concrete flowing into the upper plate 100 is introduced into the lower side of the upper plate 100 through the funnel 800, so that the empty space is not formed because the concrete is not filled in the lower side of the upper plate 100. In this case, the funnel 800 is for guiding the movement path of the tremis tube so that the tremis tube for discharging concrete can be accurately introduced into the through holes 120 and 220, and a detailed description thereof will be made with reference to the accompanying drawings. Let's explain.

In addition, the tip force measuring device applied to the present invention is further provided with a support leg 210 protruding downward on the bottom surface of the lower plate 200, can be seated in a more stable horizontally even on a non-flat surface, As in the case of using a conventional support load measuring device, it is possible to pour a certain amount of concrete on the bottom of the lower plate 200 without undergoing the basic concrete placing and curing process.

When using the conventional support load measuring device, the foundation concrete, which is placed on the bottom of the hole, is generally formed to have a thickness of 50 to 100 cm so as not to be damaged when the load generated from the cylinder is applied. When concrete is poured, the bearing capacity of the ground cannot be measured accurately. Moreover, when the load used for the measurement increases as the size of the concrete pile increases, the thickness of the foundation concrete is further increased, so there is a disadvantage in that the reliability of the measured value is lowered.

However, in the support load measuring apparatus according to the present invention, since the load generated from the cylinder 300 is applied to the support leg 210, the amount of concrete poured on the bottom of the lower plate 200 can be reduced wisely. Therefore, it is possible not only to measure the bearing capacity of the ground more accurately, but also to reduce the installation cost of the support load measuring apparatus.

7 is another embodiment of the tip force measuring device according to the present invention, Figure 8 is a cross-sectional view taken along the line B-B shown in FIG.

As shown in FIG. 7 and FIG. 8, the tip force measuring device applied to the present invention may variously change the number and arrangement of the cylinders 300 according to a user's selection. When the width of the upper plate 100 and the lower plate 200 widens as the size of the concrete pile increases, the upper plate 100 and the lower plate (when the arrangement form of the cylinder 300 is square as shown in FIG. 6). Since the load may not be evenly distributed over the entire area of 200, as shown in FIG. 8, the arrangement of the plurality of cylinders 300 may be changed so that a constant distance from each other is maintained.

9 is another embodiment of the tip force measuring device according to the present invention.

When the size of the concrete pile is small and the width of the upper plate 100 and the lower plate 200 is small, as shown in FIG. 9, the tip force measuring instrument applied to the present invention may use one cylinder 300. As such, even when one cylinder 300 is coupled to the tip force measuring instrument, through holes 120 and 220 are formed and the funnel 800 is coupled, as shown in the embodiment illustrated in FIGS. 5 to 8.

10 shows a shape in which the lower plate steel bar 434 is coupled to the lower plate 200.

As shown in FIG. 10, the rigid pipe 436 having an inner diameter is fixedly coupled to an upper surface of the lower plate 200 at a portion in contact with the lower plate pipe 432 so that the lower plate pipe 432 may be inserted into a fitting structure. The lower pipe 432 is coupled such that the lower end is inserted into the rigid pipe 436.

The reason why the lower plate pipe 432 is not fixedly coupled to the lower plate 200 is to prevent the downward movement of the lower plate 200 by being coupled with the lower plate pipe 432.

In addition, an adhesive 438 having a viscosity is applied to a portion where the rigid pipe 436 and the lower plate pipe 432 are in contact with the rigid pipe 435 and the lower plate pipe 432 so that the concrete is poured. The lower pipe 432 and the rigid pipe 436 are not coupled. At this time, the pressure-sensitive adhesive 438 is preferably applied to the silicone having a certain size of strength and at the same time waterproof.

11 is another embodiment in which the lower plate steel bar 434 is coupled to the lower plate 200.

As illustrated in FIG. 11, the lower plate pipe 432 may be taped with an adhesive tape 437 so that the lower end is in close contact with the upper surface of the lower plate 200. When the lower pipe 432 is coupled to the lower plate 200 by a taping method as described above, since the rigid pipe 436 or the adhesive 438 is unnecessary, the manufacturing cost is reduced.

At this time, the adhesive force of the tape 437 for coupling the lower plate pipe 432 and the lower plate 200 is enough to prevent the entry of concrete between the lower plate pipe 432 and the lower plate 200, the lower plate 200 It should be clear that it should not interfere with the downward movement of.

FIG. 12 illustrates a shape in which the upper steel bar 424 is coupled to the upper pipe 422.

In order to accurately measure the displacement amount of the upper plate 100, the upper plate steel bar 424 applied to the present invention should be configured to be freely vertically movable while being inserted into the upper plate pipe 422. do.

Therefore, the displacement measuring means 400 according to the present invention is used to adjust the position of the upper steel bar 424 so that the center line of the upper steel bar 424 coincides with the center line of the upper pipe 422 in order to ensure the verticality of the upper steel bar 424. It further includes a vertical degree of assistance device 426 to guide.

The vertical degree auxiliary device 426 is coupled to the outer circumferential surface of the upper plate steel bar 424 and the inner circumferential surface of the upper plate pipe 422, respectively, and maintains a predetermined distance between the outer circumferential surface of the upper plate steel bar 424 and the inner circumferential surface of the upper plate pipe 422. It is configured to be. At this time, the vertical degree auxiliary device 426 is configured to guide only the horizontal position of the upper plate steel bar 424, it should be configured so as not to affect the vertical movement of the upper plate steel bar 424.

FIG. 13 illustrates a shape in which a sensor wire protective cover is mounted to protect a sensor wire in a portion where a margin is formed.

The sensor wire 612 applied to the present invention is coupled to the 'S' shape in order to leave a margin so as not to be disconnected when the tensile force is applied due to the concrete placing and the tension of the reinforcement. In this case, when the portion coupled to the 'S' shape is in direct contact with the concrete, the margin formed by the 'S' cannot easily be unfolded when an external tensile force is applied, so the protective wire protective cover is provided on the margin portion of the sensor wire 612. 614 is coupled to surround the outside of the sensor wire 612.

In addition, the sensor wire protective cover 614 is preferably formed of a material that can absorb the shock so that the sensor wire 612 is not damaged due to external shock.

At this time, the displacement meter wire 412 is also installed to leave a margin, such as the sensor wire 612, the part where the margin of the displacement meter wire 412 is formed is wrapped by the displacement relay wire protective cover.

Since the displacement relay wire protective cover as described above is the same in function and structure as the sensor wire protective cover 614, a detailed description thereof will be omitted.

14 to 16 sequentially show a shape in which concrete is poured into the support load measuring apparatus shown in FIG. 4, and FIG. 17 illustrates an inflated tip force measuring device in the state shown in FIG. 16.

When the concrete is to be poured in the state shown in FIG. 4, the user first descends the tremble tube T to penetrate through holes (not shown) formed in the upper plate 100 and the lower plate 200, and then drill the lower end. Close to the bottom of the. At this time, the tremi tube (T) is easily drawn into the through hole because it is in contact with the inner surface of the funnel (800).

When the concrete is discharged through the tre tube (T) after the introduction of the tre tube (T) is completed, the concrete (C) is poured from the bottom of the hole, as shown in Figure 14, the amount of concrete (C) discharged As this increases, as shown in FIG. 15, the concrete C is gradually filled through the through hole of the lower plate 200 and the through hole of the upper plate 100.

At this time, the user lifts the tremi tube (T) to the upper side in accordance with the speed at which the concrete (C) rises, so that the concrete (C) can be poured more easily and evenly.

As shown in FIG. 16, when the casting of the concrete C is completed, a curing period is given for a certain period so that strength is formed in the concrete C. FIG.

When the concrete (C) is poured using the support load measuring device according to the present invention, the entire hole inside can be filled with concrete (C) in a single process, thereby shortening the construction period and reducing the construction cost.

In addition, since the concrete (C) poured inside the hole has all the same strength as the concrete pile used in the field, it is possible to obtain a more accurate measurement value.

After the curing of the concrete is completed, when applying the hydraulic pressure to the cylinder 300 inflating the tip force meter, as shown in FIG. 17, the lower plate 200 is moved downward by a certain distance by the withdrawal load of the piston 320 By the reaction force, the upper plate 100 is moved upward. In addition, the connecting member 110 is separated from the lower plate 200, the lower plate pipe 432 is separated from the rigid pipe 436, the empty space of a predetermined size is formed on the upper surface of the lower plate 200.

At this time, the user can measure the support load of the ground by measuring the displacement amount of the upper plate 100, the displacement amount of the lower plate 200, the frictional force formed on the side by using the displacement measuring means 400.

When the measurement of the support load is completed, the user draws concrete through the lower plate pipe 432 to fill the empty space formed on the upper plate 200 so that the concrete pile used for the measurement of the load can be used as a foundation pile. do.

In addition, in the state shown in FIG. 17, when the hydraulic pressure applied to the cylinder 300 is released, the piston 310 moves into the body 310 by moving the body 310 downward by its own weight. Support load measurements can be repeated.

18 is a graph showing the displacement of the upper plate 100 and the lower plate 200 according to the withdrawal load of the piston 320 when measuring the support load using the support load measuring apparatus according to the present invention.

The connecting member 110 applied to the present invention is formed so that the lower plate 200 has a strength of a size that cannot be separated by its own weight, and thus, when the support load is measured using the support load measuring apparatus according to the present invention, the piston 320 Displacement of the upper plate 100 and the lower plate 200 according to the withdrawal load of) shows a gentle curve unlike the graph shown in FIG.

Therefore, the user can measure the displacement of the upper plate 100 and the lower plate 200 from the time when a small amount of hydraulic pressure is applied to the cylinder 300, it is possible to obtain a more accurate support load.

19 is a flow chart of the support load measuring method according to the present invention.

When the support load measurement method according to the present invention to measure the support load of the ground to be embedded concrete pile, first excavated a hole of the size that can be inserted into the concrete pile in the vertical direction at the point where the concrete pile is to be embedded (S10), Using the lifting equipment to seat the tip force meter horizontally on the bottom of the hole (S20).

When the seating force of the tip force measuring device is completed, insert the tremi tube (T) into the tip force measuring instrument (S30) and cast concrete (C) inside the hole through the tremi tube (T) (S40), into the hole When curing of the poured concrete (C) is completed, the tip force measuring device is operated to expand the cylinder 300 (S50), while the tip force measuring device is in progress or when the tip force measuring device is completed. The displacement of the upper side and the lower side of the measuring instrument is measured (S60).

As the cylinder 30 is expanded, an empty space in which the concrete C is not filled is formed at the lower end of the hole where the tip force measuring instrument is installed. The upper plate 100 and the lower plate are filled with the empty space. When the displacement measurement of the (200) is completed, after disassembling the displacement measuring means 400 (S70), the concrete (C) is placed once again in the space formed in the lower hole by the expansion of the tip force measuring device (S80).

At this time, the tip force measuring instrument is provided with a pipe that is introduced from the outside of the hole to the lower end of the tip force measuring instrument, the user injects the concrete (C) through the pipe concrete in the empty space formed in the lower hole by the expansion of the tip force measuring instrument (C) can be filled. Since the concrete pouring method is the same as the concrete pouring method described with reference to FIG. 17, a detailed description thereof will be omitted.

In addition, when the concrete pile formed inside the hole is to be made of reinforced concrete piles, the step (S20) of horizontally seating the tip force meter on the bottom surface of the hole, before seating the tip force gauge of the And coupling the vertical rebar 710 and the horizontal rebar 720 and the shear rebar 730 to the upper portion (hereinafter referred to as step 2-1).

By coupling the reinforcement 700 to the upper portion of the tip force measuring unit as described above, the user can produce the concrete pile for the measurement of the same as the reinforced concrete piles mainly used in construction sites, it is possible to obtain a more accurate measurement value.

In addition, when trying to measure the main surface frictional force of the side, the step (S20) of horizontally seating the tip force meter to the bottom surface of the hole, the vertical rebar when the step (2-1) of coupling the reinforcement 700 is completed After the step of installing the transition measuring means 600 during the celebration (step 2-2 below) on the outer surface of the 710 to seat the tip force meter to the bottom of the hole (hereinafter referred to as step 2-3) A) is configured. At this time, the step (S60) of measuring the displacement of the upper side and the lower side of the tip force measuring instrument, step 6-1 to measure the frictional force of the strata in contact with the concrete using the transition measuring means 600 during the celebration. Equipped.

Thus, by measuring the support load of the ground on which concrete is to be embedded using the support load measuring method according to the present invention, it is possible to accurately measure not only when the concrete pile is buried but also the support load when the reinforced concrete 700 concrete pile is buried. After the support load measurement is completed, the concrete pile used for the measurement can be used as the foundation concrete pile by placing concrete in the empty space formed at the tip force measuring device, and by measuring the strain of the reinforcement and concrete (C) There is an advantage that can measure even the principal surface friction formed in the.

As mentioned above, although this invention was demonstrated in detail using the preferable Example, the scope of the present invention is not limited to a specific Example and should be interpreted by the attached Claim. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

When the tip force measuring device according to the present invention is used, the tip bearing force and the principal friction can be measured even at a small load, and the tip bearing force and the principal friction at the point where the concrete pile of a large load is buried by using a generally used cylinder are measured. There is an advantage that can be carried out by repeating each of the above measurements.

In addition, by using the support load measuring apparatus and measuring method according to the present invention, it is configured so that no other external force is applied to each displacement meter, it is possible to measure more precisely, which is generated at the lower end after the end bearing force and the principal surface friction measurement are completed. The advantage is that concrete can be poured in the gaps.

Claims (54)

The upper plate 100 and the lower plate 200, At least two cylinders 300 that are arranged and coupled at equal intervals so as to apply pressure evenly to the bottom surface of the upper plate 100 and the lower plate 200, Displacement measuring means 400 for measuring the displacement of the upper plate 100 and the lower plate 200 Tip force meter, characterized in that configured to include. The method of claim 1, The upper plate 100 and the lower plate 200, Tip force measuring device, characterized in that at least one through-hole 120, 220 of the shape that can be passed through the concrete is formed. The method of claim 2, On the upper surface of the upper plate 100, Tip force meter, characterized in that it is further provided with one or more funnels (800) for guiding the transport path of the concrete applied from the upper side to the through hole (120, 220). The method of claim 1, The lower plate 200, Tip force meter, characterized in that it further comprises a support leg (210) protruding downward so as to be horizontally seated even on a non-flat surface. The method of claim 4, wherein The upper plate 100 and the lower plate 200, Tip force measuring device, characterized in that at least one through-hole 120, 220 of the shape that can be passed through the concrete is formed. The method of claim 5, wherein On the upper surface of the upper plate 100, Tip force meter, characterized in that it is further provided with one or more funnels (800) for guiding the transport path of the concrete applied from the upper side to the through hole (120, 220). The method according to any one of claims 1 to 6, The displacement measuring means 400, An upper plate pipe 422 having a lower end coupled to an upper surface of the upper plate 100 to measure the displacement of the upper plate 100; An upper plate steel bar 424 introduced into the upper plate pipe 422 and having a lower end coupled to an upper surface of the upper plate 100; An upper plate displacement gauge 420 measuring a displacement of the upper plate steel bar 424; A lower plate pipe 432 in which the lower end penetrates the upper plate 100 and adheres to the upper surface of the lower plate 200 in order to measure the displacement of the lower plate 200; A lower plate steel bar 434 introduced into the lower plate pipe 432 and coupled to an upper surface of the lower plate 200 by a lower end thereof; A lower plate displacement meter 430 measuring a displacement of the lower plate steel bar 434; Tip force meter, characterized in that configured to include. The method of claim 7, wherein The displacement measuring means 400, An electric resistance automatic displacement gauge 410 for measuring the displacement between the upper plate 100 and the lower plate 200; A displacement gauge wire 412 for transmitting various signals and currents with the electric resistance type automatic displacement gauge 410; Tip force measuring device characterized in that it further comprises. The method of claim 8, The displacement meter wire 412 is, Tip force measuring device, characterized in that coupled to leave a margin not to be disconnected by the tension. The method of claim 9, A tip force measuring device, which is formed of a material capable of absorbing an impact from the outside, and further includes a displacement relay protection cover coupled to surround an outside of the margin part of the wire. The method of claim 7, wherein The lower plate 200, A rigid pipe 436 having an inner diameter formed therein so as to be inserted into the fitting structure by the lower plate pipe 432 is fixedly coupled to a portion in contact with the lower plate pipe 432; The lower pipe 432 is, A tip force meter, characterized in that the lower end is coupled to be inserted into the rigid pipe (436). The method of claim 11, A tip force measuring device, characterized in that a pressure-sensitive adhesive (438) is applied to a portion where the rigid pipe (436) and the lower plate pipe (432) is in contact. The method of claim 12, The pressure-sensitive adhesive (438) is a front end force meter, characterized in that the silicon. The method of claim 7, wherein The lower pipe 432 is, A tip force measuring device, characterized in that the bottom end is taped (taped) to be in close contact with the upper surface of the lower plate 200. An upper plate 100 and a lower plate 200; The outer end is composed of a body 310 is fixedly coupled to the bottom surface of the upper plate 100, the structure that can be pulled in and out of the body 310, the outer end is on the upper surface of the lower plate 200 A cylinder 300 including a piston 320 coupled to be in contact; A connection member 110 having both ends coupled to the upper plate 100 and the lower plate 200 so as to have strength of a size that can withstand the load of the lower plate 200; Displacement measuring means (400) for measuring displacement of the upper plate (100) and the lower plate (200); Tip force meter, characterized in that configured to include. The method of claim 15, The upper plate 100 and the lower plate 200, Tip force measuring device, characterized in that at least one through-hole 120, 220 of the shape that can be passed through the concrete is formed. The method of claim 16, On the upper surface of the upper plate 100, Tip force meter, characterized in that it is further provided with one or more funnels (800) for guiding the transport path of the concrete applied from the upper side to the through hole (120, 220). The method of claim 15, The lower plate 200, Tip force meter, characterized in that it further comprises a support leg (210) protruding downward so as to be horizontally seated even on a non-flat surface. The method of claim 18, The upper plate 100 and the lower plate 200, Tip force measuring device, characterized in that at least one through-hole 120, 220 of the shape that can be passed through the concrete is formed. The method of claim 19, On the upper surface of the upper plate 100, Tip force meter, characterized in that it is further provided with one or more funnels (800) for guiding the transport path of the concrete applied from the upper side to the through hole (120, 220). The method according to any one of claims 15 to 20, The displacement measuring means 400, An upper plate pipe 422 having a lower end coupled to an upper surface of the upper plate 100 to measure the displacement of the upper plate 100; An upper plate steel bar 424 introduced into the upper plate pipe 422 and having a lower end coupled to an upper surface of the upper plate 100; An upper plate displacement gauge 420 measuring a displacement of the upper plate steel bar 424; A lower plate pipe 432 in which the lower end penetrates the upper plate 100 and adheres to the upper surface of the lower plate 200 in order to measure the displacement of the lower plate 200; A lower plate steel bar 434 introduced into the lower plate pipe 432 and coupled to an upper surface of the lower plate 200 by a lower end thereof; A lower plate displacement meter 430 measuring a displacement of the lower plate steel bar 434; Tip force meter, characterized in that configured to include. The method of claim 21, The displacement measuring means 400, An electric resistance automatic displacement gauge 410 for measuring the displacement between the upper plate 100 and the lower plate 200; A displacement gauge wire 412 for transmitting various signals and currents with the electric resistance type automatic displacement gauge 410; Tip force measuring device characterized in that it further comprises. The method of claim 22, The displacement meter wire 412 is, Tip force measuring device, characterized in that coupled to leave a margin not to be disconnected by the tension. The method of claim 23, A tip force measuring device, which is formed of a material capable of absorbing an impact from the outside, and further includes a displacement relay protection cover coupled to surround an outside of the margin part of the wire. The method of claim 21, The lower plate 200, A rigid pipe 436 having an inner diameter formed therein so as to be inserted into the fitting structure by the lower plate pipe 432 is fixedly coupled to a portion in contact with the lower plate pipe 432; The lower pipe 432 is, A tip force meter, characterized in that the lower end is coupled to be inserted into the rigid pipe (436). The method of claim 25, A tip force measuring device, characterized in that a pressure-sensitive adhesive (438) is applied to a portion where the rigid pipe (436) and the lower plate pipe (432) contact. The method of claim 26, The pressure-sensitive adhesive (438) is a front end force meter, characterized in that the silicon. The method of claim 21, The lower pipe 432 is, A tip force measuring device, characterized in that the bottom end is taped (taped) to be in close contact with the upper surface of the lower plate 200. The method according to any one of claims 15 to 20, Tip force meter, characterized in that it comprises two or more cylinders 300 are arranged at equal intervals so as to apply pressure evenly to the bottom surface of the upper plate and the lower plate (200). Displacement measurement means for measuring the displacement of the upper plate 100 and the lower plate 200, the cylinder 300 coupled between the upper plate 100 and the lower plate 200, and the upper plate 100 and the lower plate 200 A tip force meter comprising a 400; A plurality of reinforcing bars 700 coupled to the tip force measuring device; Coupled to the reinforcement 700 to measure the transition of the jungbu 600 to measure the frictional force of the strata; Support load measuring apparatus, characterized in that comprises a. The method of claim 30, The displacement measuring means 400, An upper plate pipe 422 having a lower end coupled to an upper surface of the upper plate 100 to measure the displacement of the upper plate 100; An upper plate steel bar 424 introduced into the upper plate pipe 422 and having a lower end coupled to an upper surface of the upper plate 100; An upper plate displacement gauge 420 measuring a displacement of the upper plate steel bar 424; A lower plate pipe 432 in which the lower end penetrates the upper plate 100 and adheres to the upper surface of the lower plate 200 in order to measure the displacement of the lower plate 200; A lower plate steel bar 434 introduced into the lower plate pipe 432 and coupled to an upper surface of the lower plate 200 by a lower end thereof; A lower plate displacement meter 430 measuring a displacement of the lower plate steel bar 434; Support load measuring apparatus, characterized in that comprises a. The method of claim 31, wherein The displacement measuring means 400, Supporting load measuring device, characterized in that it further comprises an electric resistance type automatic displacement gauge (410) for measuring the displacement between the upper plate (100) and the lower plate (200). The method of claim 31, wherein The lower plate 200, A rigid pipe 436 having an inner diameter formed therein so as to be inserted into the fitting structure by the lower plate pipe 432 is fixedly coupled to a portion in contact with the lower plate pipe 432; The lower pipe 432 is, A support load measuring apparatus, characterized in that the lower end is coupled to be inserted into the rigid pipe (436). The method of claim 33, wherein Supporting load measuring device, characterized in that the pressure-sensitive adhesive (438) is applied to the portion where the rigid pipe (436) and the lower plate pipe (432) is in contact. The method of claim 34, wherein The pressure-sensitive adhesive (438) is a support load measuring apparatus, characterized in that the silicon. The method of claim 31, wherein The lower pipe 432 is, Supporting load measuring device, characterized in that the lower end is coupled by taping (taping) to be in close contact with the upper surface of the lower plate (200). The method according to any one of claims 30 to 36, The celebration transition measuring means 600, A sensor 610 coupled to the outer surface of the reinforcement 700; A sensor wire 612 which is coupled with a margin so as not to be disconnected by tension, and transmits a signal and a current to the sensor 610 during the celebration; A congratulation data processing device 620 for displaying and storing a value measured from the congratulation sensor 610; Support load measuring apparatus, characterized in that comprises a. The method of claim 37, It is formed of a material that can absorb the impact from the outside, the support load measuring device, characterized in that it further comprises a sensor wire protective cover (614) coupled to surround the outer portion of the extra portion of the sensor wire (612). The method according to any one of claims 30 to 36, The reinforcement 700 is, In order to prevent the torsion caused by external force, the support load measuring apparatus, characterized in that it comprises a shear reinforcing bar 730 is formed to form a polygonal shape is coupled in the horizontal direction. The method according to any one of claims 30 to 36, The tip force measuring device, An upper plate 100 and a lower plate 200; Two or more cylinders 300 which are coupled to be arranged at equal intervals between the upper plate 100 and the lower plate 200; One or more connecting members 110 for coupling the lower plate 200 to the upper plate 100; Displacement measuring means 400 for measuring the displacement of the upper plate 100 and the lower plate 200 Support load measuring apparatus, characterized in that comprises a. The method of claim 40, The cylinder 300, A body 310 having an outer end fixedly coupled to a bottom of the upper plate 100; A piston 320 configured to be capable of drawing in and out of the body 310, and having an outer end coupled to be in contact with an upper surface of the lower plate 200; A connection member 110 having both ends coupled to the upper plate 100 and the lower plate 200 so as to have strength of a size that can withstand the load of the lower plate 200; Support load measuring apparatus, characterized in that comprises a. The method according to any one of claims 30 to 36, The upper plate 100 and the lower plate 200, Support load measuring device, characterized in that at least one through-hole 120, 220 of the shape that can be penetrated downward. The method of claim 42, On the upper surface of the upper plate 100, At least one funnel (800) for guiding the transport path of the concrete applied from the upper side through the through hole (120, 220) is characterized in that the support load measuring apparatus characterized in that it is further provided. The method according to any one of claims 30 to 36, The lower plate 200, Supporting load measuring device, characterized in that it further comprises a support leg 210 protruding downward so as to be horizontally seated even on a non-flat surface. A first step of digging a hole in a direction perpendicular to the ground; A second step of seating a tip force meter on a bottom surface of the hole; Inserting a trailing tube (T) to penetrate the tip force measuring device; A fourth step of pouring concrete (C) from the bottom of the hole where the tip force measuring device is seated through the tremit tube (T); A fifth step of driving the tip force measuring device such that the cylinder 300 is expanded when curing of the concrete C is completed; When the expansion of the cylinder 300 is completed, the sixth step of measuring the displacement of the upper side and the lower side of the tip force measuring device using a displacement measuring means (400); Support load measuring method, characterized in that consisting of. The method of claim 45, The second step, Step 2-1 for coupling the reinforcement 700 to the top of the tip force measuring device; Step 2-2 for installing the transition measuring means 600 during the celebration of the reinforcing bar (700); It consists of two to three steps to seat the front end force meter is installed in the reinforcement 700 and the transition measuring means 600 during the celebration, The sixth step, Supporting load measuring method characterized in that it further comprises a step 6-1 to measure the frictional force of the strata in contact with the concrete by using the transition measuring means 600 during the celebration. The method of claim 45, A seventh step of disassembling the displacement measuring means 400 when the displacement measurement is completed; An eighth step of placing a second concrete in an empty space formed under the hole by expansion of the tip force measuring device; Support load measurement method, characterized in that it further comprises. 48. The compound of any of claims 45 to 47, The tip force measuring device, An upper plate 100 and a lower plate 200 each having one or more through-holes 120 and 220 formed therein through which the tremis tube T can pass; The outer end is composed of a body 310 is fixedly coupled to the bottom surface of the upper plate 100, the structure that can be pulled in and out of the body 310, the outer end is on the upper surface of the lower plate 200 A cylinder 300 including a piston 320 coupled to be in contact; A connection member 110 having both ends coupled to the upper plate 100 and the lower plate 200 so as to have strength of a size that can withstand the load of the lower plate 200; Displacement measuring means (400) for measuring displacement of the upper plate (100) and the lower plate (200); Support load measurement method, characterized in that comprises a. 49. The method of claim 48 wherein The lower plate 200, Supporting load measuring method, characterized in that it further comprises a support leg 210 which protrudes downward so as to be horizontally seated on a non-flat surface on the bottom. The method of claim 49, On the upper surface of the upper plate 100, Support load measurement method, characterized in that it is further provided with one or more funnels (800) for guiding the tremis tube (T) introduced from the upper side to the through hole (120, 220). 48. The compound of any of claims 45 to 47, The cylinder 300, Supporting load measurement method, characterized in that arranged at equal intervals so as to apply pressure evenly to the bottom surface of the upper plate and the upper surface of the lower plate (200). 48. The compound of any of claims 45 to 47, The displacement measuring means 400, An upper plate pipe 422 having a lower end coupled to an upper surface of the upper plate 100 to measure the displacement of the upper plate 100; An upper plate steel bar 424 introduced into the upper plate pipe 422 and having a lower end coupled to an upper surface of the upper plate 100; An upper plate displacement gauge 420 measuring a displacement of the upper plate steel bar 424; A lower plate pipe 432 in which the lower end penetrates the upper plate 100 and adheres to the upper surface of the lower plate 200 in order to measure the displacement of the lower plate 200; A lower plate steel bar 434 introduced into the lower plate pipe 432 and coupled to an upper surface of the lower plate 200 by a lower end thereof; A lower plate displacement meter 430 measuring a displacement of the lower plate steel bar 434; Support load measurement method, characterized in that comprises a. The method of claim 52, wherein The lower plate 200, A rigid pipe 436 having an inner diameter formed therein so as to be inserted into the fitting structure by the lower plate pipe 432 is fixedly coupled to a portion in contact with the lower plate pipe 432; The lower pipe 432 is, A support load measuring method, characterized in that the lower end is coupled to be inserted into the inside of the rigid pipe (436). The method of claim 53, wherein The pressure-bearing adhesive (438) is applied to the site where the rigid pipe (436) and the lower plate pipe (432) contacted.