KR20170009328A - Improved Bi-Directional for Pile Load Test Apparatus and thereof Method - Google Patents

Improved Bi-Directional for Pile Load Test Apparatus and thereof Method Download PDF

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Publication number
KR20170009328A
KR20170009328A KR1020150101173A KR20150101173A KR20170009328A KR 20170009328 A KR20170009328 A KR 20170009328A KR 1020150101173 A KR1020150101173 A KR 1020150101173A KR 20150101173 A KR20150101173 A KR 20150101173A KR 20170009328 A KR20170009328 A KR 20170009328A
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South Korea
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lower plate
plate
cylinder
upper plate
piston
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KR1020150101173A
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Korean (ko)
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KR101761122B1 (en
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박봉근
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(주)백경지앤씨
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Priority to KR1020150101173A priority Critical patent/KR101761122B1/en
Priority to PCT/KR2016/007761 priority patent/WO2017010848A1/en
Publication of KR20170009328A publication Critical patent/KR20170009328A/en
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00—Investigation of foundation soil in situ
    • E02D1/08—Investigation of foundation soil in situ after finishing the foundation structure
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00—Testing foundations or foundation structures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid

Abstract

The present invention relates to a cylinder head which is arranged between a top plate and a bottom plate so as to apply a uniform pressure to a bottom surface of the top plate and an upper surface of the bottom plate, A displacement measuring means for measuring displacements of the upper and lower plates, and a rolling plate formed between the cylinder and the lower plate to seat the cylinder, and a modified two-way pile- After the measurement of the tip end force and the peripheral frictional force is completed by using the test measuring device, the cylinder is returned to its original state in order to minimize the defects of the pile, so that no void is generated in the cylinder and no void is formed in the space outside the cylinder by grouting And the strength of the concrete pile after the test can be increased. It relates to the direction of pile load test measurement method.

Description

TECHNICAL FIELD The present invention relates to an improved two-way pile load test apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved bi-directional pile load test test apparatus and method using a load-cell principle, and more particularly, to a cylinder having a piston section having a round bottom surface and a rolling- plate, it is possible to repeat the support load measurement and to prevent leakage of hydraulic oil due to prevention of cylinder damage by the rolling plate. Therefore, it is possible to measure the displacement amount of the upper and lower plates accurately. Apparatus and method.

Several pragmatic and empirical methods for estimating bearing capacity and settlement of pile foundation have been proposed. Among them, pile load test is a kind of real test which reproduces when actual pile structure is constructed by applying actual load to pile. High. However, the method of selection and installation of pressurization and reaction force system for loading, and the wide test site are required, so that it is subject to many restrictions such as air and field conditions.

In addition, the large-diameter drilled pile has a large load acting on one pile, so if the bearing capacity is less than the designed value due to the defects in construction, the use and stability of the entire structure are seriously affected. In addition, drilling into the ground in the field and curing by pouring the concrete may cause a large change in the bearing capacity of the drilled pile due to carelessness or unexpected changes in the ground conditions during the construction process. Therefore, when designing using design allowable load which dynamically estimates soil based on soil condition, designers have to do conservative design, which is a big waste factor in national dimension.

In order to solve such problems, a hydraulic jack cylinder of high pressure is installed in a pile, and a reaction force against the load is established by the bearing capacity of the pile and the frictional force generated by the load, A load bearing device (US 5,576,494) has been devised which does not require a separate load-bearing device and a reaction force device, and which can be applied even in a narrow test space or a tilted position.

However, since the support load measuring device using the aster bug cell as described above takes a very long time to measure the supporting load, the base concrete has a different strength from the concrete pile piling time and curing time, There is a disadvantage in that it is not possible to measure the tip end holding force and the frictional force when the small-sized load is loaded.

In order to solve such a problem, a tip force measuring device and a support load measuring device (Korean Patent No. 10-0480297 and Korean Patent No. 10-0725510) have been proposed by the present applicant.

Hereinafter, a conventional tip force measuring device and a support load measuring device will be described with reference to the accompanying drawings.

Fig. 1 shows an internal configuration of a conventional tip force measuring device and a support load measuring device.

1, the support load measuring device includes a top plate 10 and a bottom plate 20, a plurality of cylinders 30 coupled to be arranged at equal intervals between the top plate 10 and the bottom plate 20, And a displacement measuring means (40) for measuring the displacement of the upper plate (10) and the lower plate (20), at least one connecting member (11) connecting the lower plate (20) to the upper plate A measuring device; A plurality of reinforcing bars 70 coupled to the upper surface of the upper plate 10; And an axial load transit measuring means 60 for measuring the frictional force of the ground layer by measuring the strain of the reinforcing bars 70 and the concrete by being connected to the reinforcing bars 70.

The cylinder 30 includes a body 31 fixedly coupled to the bottom surface of the upper plate 10 and a piston 32 coupled to the upper surface of the lower plate 20 to connect the upper plate 10 and the body 31, The lower plate 20 and the piston 32 are coupled to each other so as to maintain the contact state, so that the load of the cylinder 30 is directly applied to the upper plate 10.

The displacement measuring means 40 includes an electric resistance type automatic displacement meter 41 for measuring the displacement between the upper plate 10 and the lower plate 20 and a top plate displacement meter 42 for measuring the absolute displacement of the upper plate 10 And a lower plate displacement gauge 43 for measuring the absolute displacement of the lower plate 20. The data measured by the electric resistance type automatic displacement meter 41, the upper and lower plate displacement meters 42 and 43 are transmitted to the displacement data processing unit 44 for automatic calculation and storage. At the upper part of the hole where the concrete is poured, And a reference beam 50 is fixed to the top plate displacement meter 42 and the top plate displacement meter 42 while maintaining a predetermined vertical height.

Therefore, it is possible to calculate the support load of the ground by measuring the extension force of the cylinder 30 and measuring the displacement of the upper plate 10 and the lower plate 20. The upper plate displacement gauge 42 and the lower plate displacement gauge 43 measure the height of the upper plate steel bar 47 and the lower plate steel bar 49 which are led into the upper plate pipe 46 and the lower plate pipe 48, The upper plate steel bar 47 and the lower plate steel bar 48 are not in direct contact with the concrete and move in the vertical direction so that the displacement of the upper plate 10 and the lower plate 20 can be measured more accurately do.

The axial load measuring means 60 includes an axial load sensor 61 coupled to the outer surface of the reinforcing bar 70, a sensor wire 63 for transmitting signals and currents to the axial load sensor 61, And an axial load data processing device (62) for displaying and storing the measured value from the load measuring device (61).

A plurality of vertical reinforcing bars 71 connected in a vertical direction so as to be arranged in a circular shape along the outer side of the upper surface of the head force measuring device and a plurality of vertical reinforcing bars 71 for increasing the fixing and strength of the vertical reinforcing bars 71, And includes a horizontal reinforcing bar 72 and a shear reinforcing bar 73 joined to the vertical reinforcing bars 71 or the horizontal reinforcing bars 72.

2 is a perspective view of a conventional tip force measuring apparatus and a single acting type cylinder pile load test measuring apparatus.

2, the upper plate 10 and the lower plate 20 are formed with a plurality of through-holes 12, 22 each having a shape through which concrete can be pushed downward. The cylinder 30 includes upper and lower plates 10, (20). The conventional tip force measuring device is provided with a support leg 21 protruding downward on the bottom surface of the lower plate 20 so that it can be stably positioned even on a non-flat surface, A certain amount of concrete can be placed on the bottom.

Fig. 3 is a perspective view of a conventional bidirectional double-acting cylinder pile load test measuring apparatus, Fig. 4 is a front view of a conventional bidirectional double-acting cylinder pile load test measuring apparatus, Fig. 5 is a cross- This is an enlarged view of the bi-directional double acting pile load test measuring device.

3 and 4, the bidirectional double acting type cylinder can repeat the measurement of the end support force and can return the piston 32 in the cylinder 30 to its original state after the end support force measurement is completed Therefore, no gap is generated inside the cylinder, and displacement amounts of the upper and lower plates can be accurately measured.

As shown in FIG. 5, when the measuring device and method for measuring bi-directional double-acting pile load test is used, since the piston of the cylinder is re-introduced into the cylinder after the measuring of the end bearing capacity, the upper surface of the lower plate 20 and the cylinder 30 Of the piston 32 is filled with grouting, thereby reinforcing the strength of the concrete pile.

However, in the conventional tip force measuring apparatus, the single acting type and the bidirectional double acting type cylinder pile load test measurement apparatus, the ground on which the support leg protruding downward and fixed to the lower surface of the lower plate 20 is not flat If it is not stably installed, the cylinder is damaged according to the downward axial eccentricity. Therefore, the displacement amount of the upper plate and the lower plate can not be accurately measured due to leakage of the hydraulic oil.

According to the conventional technique, when the grout and concrete are poured into the lower surface of the lower plate through the trestle tube and poured, when the lower plate is flat and parallel to the ground, a slime phenomenon occurs on the bottom surface of the lower plate Excessive displacement is generated and the displacement amount of the lower plate can not be accurately measured.

(Patent No. 1) Korean Patent No. 10-0480297 See FIG. 4, page 5, line 29 to page 6 (Patent Literature 2) Korean Patent No. 10-0725510, Figs. 1 to 4, and 9 to 18 lines or less 10 to 19 lines

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a piston having a bottom surface in a round shape when a ground on which a support for protruding downwardly is fixed on a lower surface of a lower plate is not stable, An improved two-way pile capable of precisely measuring the amount of displacement of the upper and lower plates by preventing leakage of the hydraulic oil due to the prevention of damage to the cylinder even if a downward axial eccentricity is generated by the rolling plate accommodating the cylinder and the cylinder having the round- And an object of the present invention is to provide a load test measurement apparatus and method.

It is still another object of the present invention to provide an improved two-way pile load test test and measurement apparatus and method according to the present invention, in which a support portion for guiding grouting and concrete is formed on the bottom surface of a lower plate, The present invention provides an improved bidirectional pile load test test apparatus and method capable of accurately measuring the displacement amount of the lower plate by suppressing the phenomenon and increasing the fluidity of the grouting and concrete to suppress the occurrence of excessive displacement of the lower plate plate .

In addition, the improved bidirectional cylinder pile load test and measurement apparatus according to the present invention has a plurality of O-rings formed outside the piston of the cylinder, so that there is one O-ring in the case of a conventional hydraulic jack cylinder, However, according to the present invention, it is an object of the present invention to provide an improved bidirectional pile load test test apparatus and method that can reduce damage to a hydraulic jack cylinder at the time of pressurization and depressurization by providing a plurality of O-rings.

An improved bidirectional pile load test test apparatus according to the present invention comprises an upper plate and a lower plate inserted into a hole of a pile in which concrete is poured and formed with a tremendous pipe hole at the center thereof and an upper surface of the upper plate and a lower surface of the lower plate, A displacement measuring means for measuring a displacement of the upper and lower plates, and a displacement measuring means for measuring the displacement of the upper and the lower plates. The displacement measuring means is disposed between the upper plate and the lower plate, And a rolling plate.

Further, the improved bidirectional pile load test test method according to the present invention is a method for testing a two-way pile load test, comprising: a first step of excavating a hole in a direction perpendicular to a ground surface; a step of placing a bidirectional pile load test test apparatus having a cylinder between an upper plate and a lower plate, A second step of inserting a trestle tube into the bi-directional pile load test measuring device, a fourth step of pouring concrete from the bottom of the hole through the trestle pipe, A fifth step of measuring the displacement of the upper and lower sides of the test measuring device, measuring the stroke displacement of the cylinder by the flow rate introduced into the flow chamber of the cylinder by the hydraulic flow meter provided in the extended cylinder, A seventh step of restoring the expanded cylinder, a sixth step of restoring the cylinder, Characterized in that it comprises an eighth step of grouting with a predetermined space between.

The improved bidirectional cylinder pile load test and measurement apparatus according to the present invention can measure a load on a lower portion of a lower plate by downwardly protruding the lower portion of the lower portion of the piston, Even if a downward axial eccentricity is generated by a rolling plate accommodating a cylinder having a piston having a round bottom surface, the hydraulic oil leakage due to the prevention of damage to the cylinder is prevented, and the displacement amount of the upper and lower plates can be accurately measured It is effective.

In addition, by using the improved bi-directional cylinder pile load test and measurement apparatus according to the present invention, it is possible to improve the fluidity of the grouting and concrete by forming grooves in the bottom surface of the lower plate and guiding the concrete to guide the concrete, It is possible to accurately measure the amount of displacement of the lower plate by suppressing the development and increasing the fluidity of the grouting and concrete to suppress the occurrence of excessive displacement of the lower plate.

In addition, the improved bidirectional cylinder pile load test and measurement apparatus according to the present invention has a plurality of O-rings formed outside the piston of the cylinder, so that there is one O-ring in the case of a conventional hydraulic jack cylinder, However, according to the present invention, by providing a plurality of O-rings, it is possible to reduce the damage to the hydraulic jack cylinder during pressurization and depressurization.

Fig. 1 is an internal configuration diagram of a conventional tip force measuring device and a pile load test measuring device.
2 is a perspective view of a conventional tip force measuring apparatus and a single acting type cylinder pile load test measuring apparatus.
3 is a perspective view of a conventional tip force measuring device and a double-acting cylinder pile load test measuring device.
4 is a front view of a conventional tip force measuring apparatus and a double-acting cylinder pile load test measuring apparatus.
FIG. 5 is an enlarged view of a conventional pendulum load test apparatus and a double-acting pile load test apparatus of the double-acting double-pile load test apparatus.
6 is a perspective view of an improved bidirectional pile load test measuring device according to the present invention.
FIG. 7 is a front view of an improved bi-directional pile load test measuring apparatus according to the present invention.
8 is a rear view of an improved bidirectional pile load test and measurement apparatus according to the present invention.
FIG. 9 is a front view of a tilted rolled bidirectional pile load test apparatus according to the present invention.
10 is a front view of an improved bi-directional pile load test measuring apparatus according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 6 is a perspective view of an improved bidirectional pile load test apparatus according to the present invention, and FIG. 7 is a front view of an improved bidirectional pile load test apparatus according to the present invention.

As shown in the figure, the improved bidirectional pile load test and measurement apparatus according to the present invention includes an upper plate 100 and a lower plate 200 on which a tremendous pipe hole 120 is formed, a lower surface of the upper plate 100, A cylinder 300 which is arranged between the upper plate 100 and the lower plate 200 and applies a pressure uniformly to the upper surface of the upper plate 100 and the upper plate 100 and the lower plate 200, And displacement measuring means 400 for measuring the displacement.

A connecting member 110 connecting the upper plate 100 and the lower plate 200 and a trimming hole 120 formed at the center of the upper plate 100 and the lower plate 200, 200 are formed with through-holes 130 through which concrete can pass. At this time, it is preferable that a plurality of cylinders 300 are disposed adjacent to the trimming pipe hole 120, and the diameter thereof is 300 mm to 400 mm.

The cylinder 300 is a hydraulic jack cylinder having a pressure cell of less than 2000 kg / cm 2. The cylinder 300 has a body 310 having an outer end fixedly connected to the bottom surface of the upper plate 100, It is configured to include a piston (320) being composed of a possible structure.

The top plate 100 and the body 310 are coupled with each other in a screwed connection structure so that coupling force design and coupling operation are facilitated and the lower plate 200 is connected to the upper plate 100 and the lower plate 200, (110). The body 310 of the cylinder is fixedly coupled to the upper plate 100 so that the load of the cylinder is not applied to the connecting member 110 and the piston 320 is inserted into and out of the body 310, To be withdrawn. However, the coupling structure of the cylinder is not limited to this, and one end may be fixedly coupled to the lower plate 200, or both ends may be fixedly coupled to the upper plate 100 and the lower plate 200, respectively.

Since the cylinder 300 can be repeatedly stretched and compressed several times at this time, the bi-directional pile load test apparatus according to the present invention can repeat the measurement of the bearing capacity several times. It is preferable that the cylinder 300 is applied as a hydraulic jack cylinder in which hydraulic pressure is drawn in and drawn out to thereby draw the piston 320 in and out.

A plurality of O-rings 325 are formed outside the piston 320 of the cylinder 300. Accordingly, in the case of the conventional hydraulic jack cylinder, there is a possibility of damage during pressurization and depressurization due to the provision of one O-ring. However, according to the present invention, by providing a plurality of O-rings 325, There is an effect of reducing the damage.

One end of the piston 320 of the cylinder 300 is drawn in and out of the body 310 and the other end of the piston 320 is rounded to protrude outward, And the upper end of the piston 320 is formed with a rounded end surface protruding outwardly from the other side of the piston 320 on an inwardly concave rolling plate 330. At this time, the lower plate 200 and the rolling plate 330 are coupled to each other by a screw-coupling structure so that coupling force design and coupling operation are facilitated.

Therefore, since the piston 320 of the cylinder 300 can be rolled on the rolling plate 330 to prevent damage to the cylinder due to the eccentricity generated by the load, it is possible to prevent the damage of the cylinder 310 body 310 It is possible to accurately measure the amount of displacement of the upper and lower plates.

The displacement measuring means 400 includes a top plate pipe 410 having a lower end coupled to the top plate 100 to measure the displacement of the top plate 100 and a bottom plate 410 connected to the bottom plate 410, And a lower plate for measuring the displacement of the lower plate 200. The upper plate is connected to the upper plate 100 by means of the upper plate 412, A lower plate steel bar 422 which is drawn into the lower plate pipe 420 and has a lower end joined to the lower plate 200 and a lower plate steel bar 422 which is connected to the lower plate 200 and measures the displacement of the lower plate steel bar 422 And a lower plate displacement meter (not shown). A rigid pipe 424 having an inner diameter formed so as to be inserted in a fitting structure in which the lower plate pipe 420 is fitted is provided at a lower end of the lower plate pipe 420 and the lower plate 200, Thereby preventing the foreign matter from being drawn into the inside. The displacement measuring means 400 for measuring the displacements of the upper plate 100 and the lower plate 200 by using the upper plate steel bar 412 and the lower plate steel bar 422 are the same as those of the conventional displacement measuring means, Is omitted.

8 is a rear view of an improved bi-directional pile load test and measurement device according to the present invention. As shown in FIGS. 6 to 8, the bidirectional pile load test and measurement apparatus according to the present invention can be stably installed horizontally even on a non-flat surface of the lower stratum, And a receiving part 210 protruding downward from the bottom surface of the lower plate 200 so that a predetermined amount of concrete can be filled on the bottom surface of the lower plate 200.

The support part 210 is fixed to the lower plate 200 and has a predetermined height on the bottom surface of the lower plate plate to increase the flow of grout and concrete to be discharged from the tray pipe introduced into the trummy pipe hole, A plurality of inclined guide surfaces curved toward the inner center portion on the side of the untapped hole 120 are fixedly arranged at least four or more and a plurality of through holes 220 are formed in the inclined guide surface. That is, when the diameter of the pile increases, the number of the cylinders increases, and accordingly, the number of the receiving units 210 increases.

Therefore, by using the improved bi-directional pile load test measurement apparatus according to the present invention, it is possible to form a receiving unit 210 having a guiding inclined surface having a structure for improving the flow of grouting and concrete on the bottom surface of the lower plate 200 Thereby improving the flowability of grouting and concrete by inclined surfaces for guiding grooves and concrete of the receiving unit 210 and suppressing the occurrence of slimes remaining in the conventional bottom plate bottom surface structure, 200) plate is suppressed, it is possible to measure the displacement of the ground due to accurate measurement of the displacement of the lower plate more stably.

9, even when the support portion 210 is not flat due to the flow of the bottom layer at the lower portion of the lower plate 200, or when eccentricity is generated in the cylinder due to the load, Since the damage of the cylinder body 310 can be prevented by the natural rolling operation of the rolling plate 330, leakage of the hydraulic oil is prevented, and the amount of displacement of the upper and lower plates can be accurately measured.

That is, as shown in the drawing, the improved bidirectional pile load test and measurement apparatus according to the present invention is characterized in that the support portion 210 is not flat due to the flow of the bottom layer at the bottom of the bottom plate 200, When the eccentricity is generated in the cylinder, the piston 320 and the rolling plate 330 are caused to undergo a rolling displacement so that the rolling plate 300 is slightly displaced from the vertical center line and is inclined by the displacement d, The lower plate 200 to which the lower plate 200 fixedly coupled with the lower plate 200 is also slightly displaced so that both sides of the lower plate 200 are inclined by the displacement d so that no load is applied to the body 310 of the cylinder 300, It is effective.

10 is a front view of an improved bi-directional pile load test measuring apparatus according to another embodiment of the present invention. The contact structure between the piston 320 and the rolling plate 330 is not limited to that shown in FIG. 7, and a ball 340 may be interposed between the piston 320 and the rolling plate 330, as shown in FIG. It can be contacted with a structure capable of being rolled by eccentricity with a space for insertion.

Accordingly, the improved bidirectional pile load test measurement apparatus of the present invention according to FIG. 10 is similar to the operation principle of FIG. 9 in that the support portion 210 is not flat due to the flow of the bottom layer at the lower portion of the lower plate 200 The piston 320 and the rolling plate 330 are moved in the rolling motion of the piston 320 and the rolling plate 330 by the inserted ball 340 when the eccentricity is generated in the cylinder by the load from the upper portion The rolling plate 300 is slightly displaced from the vertical center line to be inclined by the displacement d and also the lower plate 200 to which the rolling plate 330 is fixed is also slightly displaced so that the left and right sides are inclined by the displacement d The load on the cylinder body 310 is not applied to the cylinder body 310, thereby preventing damage to the cylinder.

In addition, a process of constructing the concrete pile by placing the concrete so that the improved bidirectional pile load test and measurement apparatus according to the present invention as described above is buried will be described as follows.

First, it excavates perpendicularly to the ground to form a pit hole. A bidirectional pile load test test device is seated on the bottom surface of the pile hole. (Not shown) is lowered to the upper side of the bidet pile load test measuring device placed on the floor surface and the lower surface of the upper plate 100 and the lower plate 200 of the bidirectional pile load test measuring apparatus And passes through the fine hole 120. When the trimming tube is drawn into the trimming tube hole 120, the concrete is discharged to the inside of the trimming tube hole 120. The concrete discharged from the trim tube is inserted into the bottom of the lower plate 200 through the bottom surface of the bottom plate 200 so that a predetermined amount of concrete can be filled on the bottom surface of the lower plate 200 through a single foundation concrete pouring. The concrete is heated through the photo guide surface, the through hole 220, the through plate 130 of the upper plate 100 and the lower plate 200. When the concrete is poured, it is cured for a certain period of time to form a strength in the concrete.

When the curing of the concrete is completed as described above, hydraulic pressure is applied to the cylinder 300 provided in the bi-directional pile load test measurement apparatus to extend it. When the piston 320 is pulled out by the hydraulic pressure, the lower plate 200 is moved downward by a certain distance due to the load, and the upper plate 100 is moved upward by the reaction force. The connecting member 110 is separated from the lower plate 200 and the lower plate pipe 422 is separated from the rigid pipe 424. [ 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, and the frictional force formed on the side surface using the displacement measurement means 400.

The stroke displacement of the cylinder 300 can be measured by the hydraulic flow meter 315 provided in the elongated cylinder 300 by the flow rate inputted into the flow chamber 316 of the cylinder and the displacement due to the support load of the ground can be measured have. The method of measuring the tip end support force is the same as that of the conventional tip end tip end force measurement method, and thus a detailed description thereof will be omitted.

After completion of measurement of the support load of the ground as described above, when the elongated cylinder is restored, an empty space due to the restoration of the cylinder 300 is formed between the upper plate 100 and the lower plate 200. In order to grout the cement into the empty space, the user prepares the grout by thoroughly mixing the Portland cement and water so that the mixture ratio is maintained at 40% to 50%. At this time, a grouting material mixed with polyurethane, glass fiber, or carbon fiber may be used for reinforcing the strength of the grouting material.

Meanwhile, water is injected into the pipe connected to the lower plate pipe 420 of the lower plate 200 by a predetermined amount before grouting into the empty space. Thereafter, grouting is performed to the empty space of the lower plate 200 through the lower plate pipe 420. As described above, the hollow pile formed on the upper plate 200 is filled with concrete by grouting, so that the concrete pile used for supporting load measurement can be used as a foundation pile.

At this time, in the related art, the bottom surface structure of the lower plate 200 is flat and displacement occurs in the lower plate due to slime phenomenon at the bottom surface of the lower plate 200. In the present invention, The fluidity of the concrete is enhanced by the induction surface of the receiving portion 210 fixed to the lower surface of the lower plate 200 and the through hole 220 through which the tremy pipe hole 120 or the through hole 130 passes, Thereby preventing slime phenomenon. As a result, there is no over displacement in the lower plate 200 due to the slime remaining. Therefore, it is possible to measure the support load of the lower plate and more reliably measure the displacement due to the load of the ground.

The concrete pile load test test apparatus and method according to the present invention is characterized in that when the measurement of the tip end supporting force by the cylinder 300 of the improved bidirectional pile load test test apparatus is completed, Is inserted into the cylindrical body 310 and grooves are formed in the hollow space formed on the lower plate 200 to reinforce the strength of the end bearing capacity concrete pile.

According to another embodiment of the present invention, the cylinder 300 coupled to the upper plate 100 and the lower plate 200 according to various arrangements of the cylinder and the tremendous pipe hole 120 provided in the bidirectional pile- Can be changed according to the needs of the user. Even if the number of the cylinders 300 is changed, it is preferable that the cylinders 300 are arranged so as to apply uniform pressure to the upper plate 100 and the lower plate 200. That is, it is preferable that the cylinder 300 is configured so that the pressure applying area of the entire area of the upper plate 100 and the lower plate 200 is set within 8.95% to 58.52%, and the area with respect to the sectional area of the pile hole is 6.4 % To 47.4%.

Various embodiments in which the cylinder 300 is disposed with respect to the entire area of the upper plate 100 and the lower plate 200 are the same as those of the conventional example in which the area ratio of the cylinder coupled to the upper plate 100 and the lower plate 200, The detailed description thereof will be omitted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the present invention.

100: upper plate 110: connecting member
120: Trace tube hole 130: Through hole
200: lower plate 210:
220: through hole 300: cylinder
310: body 320: piston
325: O-ring 330: Rolling plate
340: Ball 400: Displacement measuring means
410: top plate pipe 412: top plate steel bar
420: lower plate pipe 422: lower plate steel bar
424: Rigid pipe

Claims (18)

An upper plate and a lower plate inserted into a pit hole in which concrete is poured and formed with a trestle pipe hole at the center;
A cylinder connected to at least one of the upper plate and the lower plate arranged between the upper plate and the lower plate so as to uniformly apply pressure to the lower surface of the upper plate and the upper surface of the lower plate;
Displacement measuring means for measuring displacements of the upper and lower plates;
And a rolling plate formed between the cylinder and the lower plate to seat the cylinder. The fuel cell system according to claim 1,
And a piston having an outer end fixedly coupled to a bottom surface of the upper plate and a piston configured to be able to be drawn in and out from the inside and the outside of the body. The method of claim 2,
The other end of the piston is formed into a round shape protruding outward and fixed to the lower plate. The other end of the piston is fixed to the rolling plate, Wherein the first and second pile load test devices are configured to be seated. The method of claim 2,
Wherein a plurality of O-rings are provided outside the piston of the cylinder. The method according to any one of claims 1 to 4,
Wherein the lower plate is connected to the upper plate by connecting members whose both ends are coupled to the upper plate and the lower plate, respectively. The method according to any one of claims 1 to 4,
Further comprising a support portion protruding downward from a bottom surface of the lower plate so that a predetermined amount of concrete can be filled in the bottom surface of the lower plate. [7] The apparatus according to claim 6,
A plurality of guide surfaces fixed to the lower plate and having a predetermined height and inclined to an inner center portion on the side of the trapezoidal hole and a plurality of through holes formed in the inclined guide surface Test measuring device. A first step of excavating the hole in a direction perpendicular to the paper surface;
A second step of placing a bidirectional pile load test measuring apparatus provided with a cylinder between the upper plate and the lower plate and a rolling plate for seating the cylinder in the hole excavated in the first step;
A third step of inserting a trestle tube into the bi-directional pile load test measurement device;
A fourth step of pouring concrete from the bottom of the hole through the trestle tube;
A fifth step of measuring the displacement of the upper and lower sides of the bidirectional pile load test apparatus by extending the cylinder when concrete poured in the fourth step is cured;
A sixth step of measuring a stroke displacement of the cylinder by a flow rate introduced into the flow rate chamber of the cylinder by a hydraulic flow meter provided in the extended cylinder to measure a displacement of the ground;
A seventh step of restoring the cylinders stretched in the fifth and sixth steps;
And an eighth step of grouting in a predetermined space between the upper plate and the lower plate formed by the restoration of the cylinder. The method of claim 8,
(8-1) preparing grout by mixing Portland cement and water;
8-2 < th > step of injecting water through the lower-side down pipe of one side;
(8-3) injecting the grout into the predetermined space between the upper plate and the lower plate; Wherein the method further comprises the step of: The bidirectional pile load test apparatus according to claim 8,
An upper plate and a lower plate formed at the center of the trestle tube hole,
A cylinder connected to at least one of the upper plate and the lower plate and arranged between the upper plate and the lower plate so as to apply an even pressure to the lower surface of the upper plate and the upper plate,
And displacement measuring means for measuring displacements of the upper plate and the lower plate,
And a rolling plate formed between the cylinder and the lower plate to seat the cylinder. The method of claim 10,
The cylinder includes a body having an outer end fixedly coupled to a bottom surface of the upper plate and a piston having a structure capable of being drawn in and out from the inside and the outside of the body. One end of the piston of the cylinder enters and leaves the inside and outside of the body, Wherein the other end of the piston is formed in a round shape having an outer end projecting outwardly and fixed to the lower plate and the other end of the piston is seated on a rolling plate having an upper portion recessed inward. Test method. The method of claim 11,
Wherein a plurality of O-rings are provided outside the piston of the cylinder. The method of claim 8,
The lower plate is connected to the upper plate by connecting members each having both ends connected to the upper plate and the lower plate and further includes a receiving part protruding downward on the bottom surface of the lower plate so that a predetermined amount of concrete can be filled in the bottom surface of the lower plate Of the pile load test. 14. The apparatus according to claim 13,
A plurality of guide surfaces fixed to the lower plate and having a predetermined height and inclined to an inner center portion on the side of the trapezoidal hole and a plurality of through holes formed in the inclined guide surface Test method. An upper plate and a lower plate inserted into a pit hole in which concrete is poured and formed with a trestle pipe hole at the center;
A cylinder connected to at least one of the upper plate and the lower plate arranged between the upper plate and the lower plate so as to uniformly apply pressure to the lower surface of the upper plate and the upper surface of the lower plate;
Displacement measuring means for measuring displacements of the upper and lower plates;
A rolling plate formed between the cylinder and the lower plate to seat the cylinder;
And a space for inserting a ball between the piston and the rolling plate is provided, and the rolling is performed by inserting the ball. 16. The method of claim 15,
Wherein a plurality of O-rings are provided outside the piston of the cylinder. The method according to claim 15 or 16,
The lower plate is connected to the upper plate by connecting members each having both ends connected to the upper plate and the lower plate and further includes a receiving part protruding downward on the bottom surface of the lower plate so that a predetermined amount of concrete can be filled in the bottom surface of the lower plate The improved bidirectional pile load test measuring device. [19] The apparatus according to claim 17,
A plurality of guide surfaces fixed to the lower plate and having a predetermined height and inclined to an inner center portion on the side of the trapezoidal hole and a plurality of through holes formed in the inclined guide surface Test measuring device.
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