KR20070052089A - Support load measurement way of concrete pail and the installation established on base - Google Patents

Abstract

The present invention measures the support load of concrete piles placed on the ground to estimate the actual bearing capacity and settlement of piles by measuring the tip bearing capacity and the principal friction of the concrete piles placed on the ground in carrying out the basic construction of various civil engineering and buildings A method and apparatus therefor, in particular, by providing a separate main surface friction force means for increasing the main surface friction at a predetermined position of the concrete pile to fully measure the ultimate tip bearing capacity and the main surface friction of the pile under any type of ground conditions It is to be done. It is installed on the tip of the concrete pile placed in the hole of the stratum and vertical expansion unit for expanding at least two cylinders by the action of hydraulic pressure transmitted from the outside to apply an upward force and a downward force; A horizontal expansion part installed at a predetermined position, which is an intermediate part of the concrete pile, to apply outward force to the inner circumferential surface of the hole by expansion of at least two horizontal cylinders by hydraulic pressure; A hydraulic pressure supply unit which is installed on the ground and supplies hydraulic pressure to each cylinder of the vertical expansion unit and the horizontal expansion unit by a pump; And measuring means for sensing the displacements of the vertical and horizontal expansion parts to be measured by an automatic displacement gauge on the ground.

Pile, tip bearing capacity, principal friction force, tip force measuring instrument, principal friction force measuring instrument, support load

Description

Support load measurement way of concrete pail and the installation established on base

1 is a configuration diagram showing a support load measuring device of a conventional ground concrete pile

2 is a block diagram of the measuring device of the present invention

Figure 3 is a state diagram installed in the hole measuring device of the present invention

4 is a configuration diagram of the present invention the horizontal expansion portion

5 is a configuration diagram of the vertical expansion unit of the present invention

FIG. 6 is a perspective view of a portion of FIG. 5; FIG.

7 is a plan view of FIG.

8 is a partial perspective view of the present invention the horizontal expansion portion

9 is an enlarged view of a part of FIG. 8;

10 is a plan view of FIG.

11 is a block diagram showing another embodiment of the present invention

12 is a configuration diagram showing another embodiment of the present invention the vertical expansion portion

Figure 13 is a block diagram showing another embodiment of the present invention the horizontal expansion portion

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

100: vertical expansion portion 110, 120: upper and lower plates

130: cylinder 131,132: piston

133: inlet 134: outlet

135: stopper 136: spring

137: stop gear 140,141: sensor

150: supply pipe 151: supply pipe

160: collection pipe 161: recovery pipe

200: horizontal expansion portion 210,220: upper and lower plates

230: horizontal cylinder 231: piston

232: inlet 233: outlet

240: Pressure plate 250: Supply distribution pipe

251: supply pipe 260: collection pipe

261: recovery pipe 270: sensor

300: hydraulic pressure supply unit 310: beam

320, 321: valve 330 pump

350: grounding tank 360: discharge valve

400: measuring unit 410: automatic displacement meter

420: wire

The present invention measures the support load of concrete piles placed on the ground to estimate the actual bearing capacity and settlement of piles by measuring the tip bearing capacity and the principal friction of the concrete piles placed on the ground in carrying out the basic construction of various civil engineering and buildings Apparatus, more particularly, by providing a separate main surface friction force means for increasing the main surface friction force at a predetermined position of the concrete pile to fully measure the extreme tip support and the main surface friction of the pile under any type of ground conditions It is to be done.

In general, when constructing bridges, subways, and various large buildings, concrete piles are installed as one of sufficient foundation works in order to cope with the loads of buildings that are built on the ground.

In particular, when the building is large, it is required to directly cast a relatively large concrete pile corresponding to the large building directly onto the ground without blocking the small-capacity concrete pile formed in advance.

In this case, the hole is drilled to a size that can accommodate the site where the pile is to be installed, and then a concrete pile is installed in addition to a load cell test apparatus for testing the load capacity therein. After the casting is completed, the load cell test device is used to measure the bearing capacity and settlement of the concrete pile.

Thus, in order to estimate the bearing capacity and settlement of piles, various measurement methods or measuring apparatuses have been proposed in the past, and among these methods, so-called pile static load test has been widely used because of the highest reliability.

The pile static load test is a kind of physical test that measures the supporting load by actually applying a load to the pile, which has the advantage of high reliability because it reproduces when the building is actually constructed, but on the other hand, the type of reaction system for load loading There were many problems with various field conditions such as installation method, and space for test.

Therefore, in recent years, in order to improve the above problems, a new measuring apparatus and method called an osterburg cell test have been proposed and used.

This is U.S. Patent No. 5,576,494, which installs an expansion means operated by a hydraulic jack at the tip of the pile, that is, the bottom, to elevate the concrete pile placed on the ground to measure the tip bearing capacity and the principal surface friction of the pile. This is as shown in Figure 1 of the accompanying drawings.

As shown in the figure, a hole (H) of a constant size is drilled in a conventional manner on the ground, and a concrete pile (S) is placed therein, and a tip of the pile (S), that is, a pile under hydraulic operation, is piled up. An expansion unit (A) for elevating the operation is installed and at the same time connected to the expansion unit (A) on the ground is configured to install a measuring unit (B) to measure the tip bearing force and the main surface friction force of the pile.

The expansion portion (A) is provided with a hydraulic jack which is installed between the upper and lower plates (10) (11), and the upper and lower plates (10, 11) made of a plate shape, the hydraulic jack is provided on the upper plate (10) It is composed of a cylindrical cylinder 21 fixedly installed, and a piston 22 fastened to the cylinder 21 and fixed to the lower plate 11 while being pushed back and forth by hydraulic pressure.

One side of the cylinder 21 is connected to the ground hydraulic pump (P) and the connection hose 23 is installed inlet 24 for supplying the hydraulic pressure, while the other side is connected to the recovery hose 25 is introduced An outlet 26 is installed to discharge the hydraulic pressure to the ground.

In addition, the measuring unit (B) is installed on the beam 30 is installed on the ground, the beam 30 is connected to the upper and lower plates 10, 11 and the measuring rods 31, 32, respectively. Upper and lower plate displacement meters 33 and 34 for measuring these displacements are provided, respectively.

That is, the upper plate displacement gauge 33 is connected to the upper plate 10 as the measuring rod 31 to measure the displacement of the upper plate 10, and the lower plate displacement gauge 34 is also the measuring rod 32 as the sleeve 35. The lower plate 11 is connected to measure the displacement of the lower plate 11 through.

Therefore, as shown in FIG. 1, when the concrete pile S as well as the oster burg cell are installed in the hole H, and the hydraulic pressure is applied to the cylinder 21 of the hydraulic jack 20, the piston 22 is moved upwards. As the lower plate 10, 11 is opened, the upward force and the downward force act respectively.

That is, the lower plate 11 moves downward to generate a tip bearing force by pressing the bottom surface of the hole, and at the same time, the upper plate 10 moves upward to elevate the entire concrete pile S so that the outer periphery of the pile S and the underground Giving friction between strata creates friction.

According to this operation, the upper and lower plates 10 and 11 and the measuring rods 31 and 32 are respectively connected to the upper and lower plate displacement meters 33 and 34, respectively, to measure the up and down movement separately, so that Downward strain curves can be drawn or recorded.

The test is terminated when the limit of the load is no longer increased by the continuous operation or the capacity of the hydraulic jack 20 is reached, and the corresponding loads at each displacement are obtained in this way.

Unlike the conventional load test, the osterburg cell test has the characteristics that the tip bearing force and the principal friction can be simultaneously measured without a special device, and its configuration is not only relatively simple but also inclined or narrow space. It has many advantages, such as being able to be applied in the field and the test of ultra high load capacity in large-caliber cast-in-place piles.

However, the Osterburgh cell test method has various disadvantages despite having excellent advantages as described above.

First of all, the Oster Burger cell test is terminated when the tip bearing capacity or principal friction is reached to the limit or the Oster Burger cell runs out of capacity. When it is reached, a case must be terminated.

Therefore, the test is terminated before the other reaches the limit, which may lead to problems that cannot be accurately measured.

In this case, once installed, the concrete pile and the Osterberg cell are not only large but also buried underground, so it is impossible to replace or reinforce them in reality. There is a significant problem that must be implemented.

In order to prevent this, it is absolutely required to construct the pile with proper facilities by fully predicting and interpreting the tip bearing capacity and the principal friction, but this is a very difficult problem in various economic and practical aspects.

In addition to the above problems, in order to measure the displacement amount of the upper and lower plates 10 and 11, the upper and lower plates 10 and 11 installed at the tip of the pile S and the upper and lower plate displacement meters 33 installed on the ground 33 ) 34 because of the configuration to be connected to the measuring rods (31) (32) not only has a very complicated structural problem, but also has a problem that does not make accurate operation.

In addition, since the hydraulic pressure is used to inflate the piston, there is a very high problem of causing groundwater contamination due to rupture of the hydraulic hose during pressurization.

The present invention has been made in consideration of the above problems, and its purpose is to enable to artificially adjust the circumferential friction force to improve and to measure the ultimate tip bearing force and the circumferential friction force of the concrete pile under any soil condition. The present invention provides a method and a device for measuring the support load of a cast concrete pile.

Another object of the present invention is to provide a support load measuring apparatus for concrete piles placed on the ground to simplify the configuration to improve the manufacturability and installation.

The present invention for achieving the above object is achieved by providing a new measuring method and measuring device, that is, the lower end of the concrete pile is expanded by a hydraulic cylinder to lift and operate the concrete pile to measure the end support force and the main surface friction force At the same time, by installing a vertical expansion portion, the horizontal expansion portion to apply a horizontal force to the inner circumferential surface of the hole by the operation of the hydraulic cylinder to increase the principal surface friction force to be installed at a predetermined position of the pile according to the tip and the ground conditions Under the conditions it is characterized in that it is possible to measure the ultimate tip bearing capacity and the principal surface friction of the concrete pile.

Hereinafter, the detailed configuration of the present invention will be described in detail with reference to the accompanying drawings.

2 and 3 of the accompanying drawings show in detail the structure of the overall measuring device according to an embodiment of the present invention, Figures 4 to 13 shows a partial structure of the present invention in detail, Figure 14 of the present invention A block diagram according to the measurement method is shown.

The structure according to the measuring device of the present invention is installed at the lower end of the concrete pile (S) and at the same time configure the vertical expansion unit 100 to move the pile up and down by the hydraulic jack, the vertical expansion unit 100 or Installed in a predetermined position of the pile constitutes a horizontal expansion portion 200 to increase the principal surface friction by applying a force to the side of the hole by the hydraulic jack, and on the vertical and horizontal expansion portion 100, 200 The hydraulic pressure supply part 300 which provides hydraulic pressure, and the measuring part 400 which measure the load bearing force of a concrete pile are provided.

The vertical expansion unit 100 is to be installed at the bottom or bottom of the concrete pile (S), which is a dual type so that a plurality of cylinders 130 can work up and down between the upper and lower plates 110, 120 While being configured, the upper and lower sensors 140 and 141 measuring the displacement amount of the upper and lower plates 110 and 120 are respectively installed.

The upper and lower plates 110 and 120 are made of a disc of metal material, and a plurality of through holes 111 are drilled in the free space where other related parts are not installed therein. Since the cross-sectional area is smaller than that of the 110, the limit of the tip bearing force can be easily reached.

That is, according to the selection, the upper and lower plates 110 and 120 may be formed in the same size, and if necessary, the lower surface of the lower plate 120 is formed smaller than the upper plate 110 to form the bottom surface of the hole H. By reducing the cross-sectional area in contact with the surface, it is possible to easily reach the limit of the tip bearing capacity.

In addition, the cylinder 130 is configured so that pistons 131 and 132 are respectively installed on both sides of the cylinder 130 so as to advance and retreat them by hydraulic pressure. The outlets 134 are respectively connected.

The upper piston 131 of the cylinder 130 is fixed to the bottom of the upper plate 110 and at the same time the lower piston 132 is fixed to the upper surface of the lower plate 120 by the operation of the cylinder 130 both pistons ( 131, 132 is advanced, the upper and lower plates 110, 120 are operated to lift at the same time.

At this time, the piston is moved up and down in the cylinder 130, the piston 131, 132 is a principle for measuring the displacement generated by moving forward to prevent the piston (131, 132) to move back to the original position Stop means may be provided for this purpose.

These stop means are installed as needed, as shown in Figure 12 of the accompanying drawings, one side of the cylinder 130 is provided with a stopper 135, which is operated in one direction by the spring 136, respectively, in the up and down directions, respectively. At the same time, the stopper 135 is engaged with the rods of the upper and lower pistons 131 and 132 so that the stop gear 137 is formed to allow the forward and prevent the retreat.

The stop means may be applied to the horizontal expansion portion 200 as it is shown in Figure 13 of the accompanying drawings.

In addition, at the central position between the upper and lower plates 110 and 120, a supply distribution pipe 150 and a collection and collection pipe 160 for supplying and recovering water pressure to them at once are installed.

These supply distribution pipe 150 and the collection collecting pipe 160 is formed in a circular ring pipe is connected to the inlet 133 and the outlet 134 of each cylinder 130 and at the same time there is a ground pressure supply unit 300 And a supply pipe 151 and a recovery pipe 161 are respectively installed.

Therefore, the hydraulic pressure supplied from the hydraulic pressure supply unit 300 through the supply pipe 151 is supplied to each cylinder 130 through the supply distribution pipe 150 at once, and conversely, the recovery collection from each cylinder 130 at the time of recovery. After being collected by the water pipe 160, it is recovered at once through the recovery pipe 161.

On the other hand, the number of the cylinder 130 can vary depending on the size of the upper and lower plates 110 and 120, it is more preferable to install four in consideration of the balance.

In addition, the sensors 140 and 141 are connected to the upper and lower pistons 131 and 132 by brackets 142 on one side of the cylinder 130 to sense the displacement amount according to the up and down lifting operation. The signal is sent to the electric resistance automatic displacement meter 410 of the installed measuring unit 400 of.

Here, the sensors 140 and 141 are already known, and are connected to the automatic displacement gauge 410 and the wire 420 on the ground, and the automatic displacement gauge 410 automatically calculates and stores the measured data.

The horizontal expansion portion 200 is installed in the intermediate position of the concrete pile (S) can be artificially adjusted to increase the principal surface friction of the concrete pile (S).

It is also equipped with upper and lower plates 210 and 220 which are also formed of a disk body of a metal material, and a plurality of horizontal cylinders 230 are installed at equal intervals between the upper and lower plates 210 and 220.

The horizontal cylinder 230 is fixedly installed horizontally between the upper and lower plates 210 and 220, and at the same time, the pressing plate 240 having a circumferential surface is fixedly installed at the front end of the piston 231, and the horizontal cylinder 230 At the rear end of the inlet 232 and the outlet 233 for introducing and discharging the water pressure are respectively installed.

At this time, the pressing plate 240 is to be in close contact with the inner surface of the hole to increase the main surface friction force, while being formed in a roughly the same curved surface as the circumferential surface to facilitate the close contact with the inner circumferential surface of the hole, to prevent slipping on the surface It is constructed with cotton.

The uneven surface is formed in a plurality in the transverse direction, but it can be formed in various forms, such as not only may be formed in the vertical direction, but also in the form of a protrusion projecting outward in the form of a point as an embodiment. Of course you can.

In addition, a supply distribution pipe 250 and a collection collection pipe 260 for collectively supplying and recovering water pressure to each horizontal cylinder 230 are formed in a circular space between the upper and lower plates 210 and 220.

The inlet 232 of each horizontal cylinder 230 is connected to a predetermined position of the supply distribution pipe 250, and the outlet 233 of each horizontal cylinder 230 is connected to the recovery collection pipe 260, and the supply distribution pipe A predetermined position of the 250 and the collection collecting pipe 260 is connected by a ground pressure supply unit 300, a supply pipe 251, and a recovery pipe 261.

On the other hand, the number of the horizontal cylinder 230 is installed at equal intervals in the circumferential direction, because the number is not limited, it will be natural that it can vary depending on the overall size.

In addition, one side of each horizontal cylinder 230 is provided with a sensor 270 for measuring the displacement of the pressure plate 240 is pressed by the forward operation of the piston 231, that is, the sensor 27 is both sides Each of which is connected to the horizontal cylinder 230 and the pressure plate 240 and is connected to the automatic displacement gauge 410 of the measuring unit 400 installed on the ground as the wire 420.

In the above structure, the supply means for introducing and discharging water pressure into each horizontal cylinder 230 of the horizontal expansion unit 200 is configured to be connected to the vertical expansion unit 100 separately. It may be installed in a pipe to supply and retrieve at the same time.

In addition, the hydraulic pressure supply unit 300 for supplying and recovering the hydraulic pressure to the vertical expansion unit 100 and the horizontal expansion unit 200 is installed on the ground.

The hydraulic pressure supply unit 300 is fixed to the beam 310 is installed on the ground, which is connected to the supply pipe 151, 251 of the vertical expansion unit 100 and the horizontal expansion unit 200 and the supply pipe The pump 330 is provided, and valves 320 and 321 are installed at predetermined positions thereof to control the supply.

The pump 330 is connected to a water tank (not shown) to strongly pump its water so as to supply water pressure into each cylinder through the supply pipes 151 and 251, and therebetween, a check valve including a control valve, And a pressure gauge is installed, and the front of the pump 330 is connected to the grouting tank 350 is configured to selectively supply the concrete liquid.

That is, the pump 330 is to supply the water in the water tank with a strong hydraulic pressure or a concrete liquid in the grinding tank 350 by a plurality of valves installed at the front and rear.

In addition, the discharge valve 360 connected to the recovery pipes 161 and 261 of the vertical expansion portion 100 and the horizontal expansion portion 200 is installed at predetermined positions on the opposite side thereof to provide a function of controlling the discharge of water pressure. Done.

Therefore, the present invention configured as described above is operated according to the following measuring method, which will be described in detail with reference to the block diagram shown in FIG. 14 of the accompanying drawings.

First step (hole drilling)

The present invention excavates the hole (H) vertically using separate excavators in the position where the concrete pile (S) is to be embedded as usual.

The hole (H) is to provide a hole in which the concrete pile (S) is to be poured, the size and depth of the building, as well as the number of installation is determined in advance according to the size of the building, etc., concrete pile (S) is actually placed The hole (H) is to be excavated at the position.

2nd step (assembly of measuring device)

The measuring device according to the present invention is assembled integrally to the reinforcing bars (R) used as the skeleton of the concrete pile (S).

The reinforcing bar (R) is to be integrally placed inside the concrete pile (S) to maintain the overall skeleton, that is, the skeleton of the reinforcement is most installed when the concrete in the vertical, vertical and circumferential direction It is assembled and assembled, the vertical expansion portion 100 according to the present invention is assembled at the lower end or the lower end thereof, the horizontal expansion portion 200 is integrally assembled at the center.

In this case, the horizontal expansion unit 200 may be assembled in combination with the vertical expansion unit 100 according to the selection as well as the position of the central portion.

3rd Step (Measuring Device Installation)

The measuring device and the reinforcing bars (R) assembled as described above are inserted into the inside of the hole (H) by using various lifting equipment such as a crane.

The vertical expansion part 100 and the horizontal expansion part 200 which are the measuring apparatus of this invention are seated correctly in the hole H by the frame | skeleton into which the rebar is assembled, The vertical expansion part 100 is the hole H At the same time it is installed at the bottom or bottom of the horizontal expansion portion 200 is installed in the center position of the hole (H).

In addition, the skeleton of the concrete pile (S) in this way in a stable position inside the hole (H) on the ground to install the measuring unit 400 including the hydraulic pressure supply unit 300 using the beam 310 or the like. .

4th step (casting of concrete piles)

Subsequently, the concrete pile S is poured by curing after injecting concrete from the lower end portion of the inside of the hole H by using a tremi tube (not shown).

The method of placing the concrete pile (S) is the same as the conventional one, which corresponds to the foundation of the building to be built.

5th Step (Measurement Device Drive)

When the concrete pile S is cured, it is driven by supplying water pressure to the vertical and horizontal expansion parts 100 and 200 in order to attempt the measurement according to the present invention.

First, when operating the operation mode according to the hydraulic pressure supply of the vertical expansion unit 100, the pump 330 is operated by the signal of the controller according to the water in the water tank 340 is pumped through the supply pipe 151 After being supplied into the supply distribution pipe 150, it is introduced into each cylinder 130 through the injection hole 133 to act.

As the upper and lower pistons 131 and 132 move forward by the hydraulic pressure flowing into the cylinder 130, the upper and lower plates 110 and 120 are lifted and operated, so that an upward force and a downward force act on them. .

Subsequently, when the horizontal expansion unit 200 is also operated in the hydraulic pressure mode, the hydraulic pressure by the pump 330 is supplied to the supply distribution pipe 250 through the supply pipe 251, and then through each injection port 232, each horizontal cylinder ( 230) at the same time.

Accordingly, as the piston 231 of the horizontal cylinder 230 is advanced, the pressing plate 240 of the front end is strongly adhered to the inner circumferential surface of the hole, thereby increasing the supporting load of the concrete pile.

At this time, the plurality of the pressure plate 240 may be uniform in the action of the force as the plurality is formed in the circumferential direction, it may be more closely adhered to the inner peripheral surface of the hole by the uneven surface of the front.

Therefore, the principal surface frictional force is increased by the adhesion of the horizontal expansion unit 200 so that not only can the required principal surface frictional force of the concrete pile be sufficiently obtained, but also the limit thereof can be reached after the limit of the tip bearing capacity is reached. You can expect a measurement.

Here, the operation of the horizontal expansion unit 200 may be selectively performed when the value of the desired principal surface frictional force does not come out after operating the vertical expansion unit 100, and the vertical and horizontal expansion unit 100, 200 It could work at the same time.

6th Step (Measurement)

According to the lifting operation of the vertical expansion unit 100, the displacement amount according to the upward force and the downward force of the concrete pile S is sensed by the upper and lower sensors 140 and 141, respectively, and the signal is measured on the ground 400. By being sent to the automatic displacement gauge 410, the automatic displacement gauge 410 analyzes this to measure the tip bearing capacity.

That is, the tip support force of which the lower plate 120 receives resistance at the bottom surface of the hole as the upper and lower plates 110 and 120 are raised and lower is sensed by the lower sensor 141 and is generated between the concrete pile and the hole. The principal surface frictional force is sensed by the upper sensor 140 to measure the displacement amount.

At this time, when the hydraulic pressure acts on each cylinder 130, the upper and lower pistons (131, 132) at the same time based on the center of the elevating operation and the upward and downward force is transmitted evenly to the limit according to the leaflet bearing force and the main surface friction force There is an advantage that can be reached.

Subsequently, when the upper and lower plates 110 and 120 are raised and lowered to reach an extreme load which is no longer increased by the load of the pile, the displacement amount according to the upward and downward movement thereof is measured by the automatic displacement gauge 410 of the measuring unit 400. ), The leaflet intelligence and the principal friction can be measured.

As described above, when only the vertical expansion part 100 is tested, the support load of the concrete pile S does not come out as a required value due to various factors, or if the limit of the frictional force is reached first before the end bearing force, accurate measurement is not made. Cases may occur.

At the same time, the sensor 270 senses that each pressing plate 240 of the horizontal expansion part 200 is in close contact with the inner circumferential surface of the hole H, and sends a signal to the automatic displacement gauge 410 on the ground. As well as increase, the value can be measured.

In particular, when only the operation of the vertical expansion unit 100 does not come out sufficient main surface friction force may not only selectively perform the horizontal expansion unit 200, but also to operate the vertical and horizontal expansion unit 100, 200 at the same time Could be

7th Step (Finishing)

As described above, when the measurement of the tip bearing capacity and the principal friction of the concrete pile (S) is completed, the high strength liquid injection material (grout) made of cement, sand, water, etc. is injected into the inner space while leaving these test devices intact. It will be used as the basis of the structure.

In this case, when switching to the liquid injection mode, the pump 330 is operated in a state in which the hydraulic pressure supply valves of the hydraulic pressure supply unit 300 are blocked and at the same time the supply valve and the discharge valve 360 of the liquid injection material are opened.

By the operation of the pump 330, the water filled in the interior of each pipe including each cylinder of the vertical expansion unit 100 and the horizontal expansion unit 200 is discharged 134, 233 of the cylinders 130, 230 After the water is collected by the collecting pipes 160 and 260, all of them are discharged to the ground via the collecting pipes 161 and 261.

Subsequently, when all the water is discharged, the liquid injection material is sufficiently supplied along the passage through which the water is initially supplied by blocking the discharge valve 360 to completely cure the inside of the space.

That is, water is pushed out by the liquid injection material supplied by the operation of the pump 330 and discharged to the outside, and the liquid injection material is filled and cured instead of water in the space of each passage.

In addition, in the space generated between the various members of the vertical and horizontal expansion unit, all the work is completed by putting concrete through the pretreatment tube, which is installed in the same way as usual, and curing.

Therefore, the present invention is to complete the measurement by sequentially going through the above process.

On the other hand, Figure 11 of the accompanying drawings shows another embodiment according to the measuring device of the present invention.

The horizontal expansion portion 200a may be installed in two or more at a predetermined position as well as the center thereof, depending on the installation length of the concrete pile, and may also be used in combination with the vertical expansion portion 100 as shown in the drawing. have.

In this case, a plurality of horizontal cylinders 230a are installed between the upper and lower plates 110 and 120 of the vertical expansion part 100, which are formed so that the pistons 231a protrude outwards between the cylinders 130. The piston 231a is integrally provided with a pressure plate 240a having a curved surface.

In addition, the inlet 232a and outlet 233a through which the water pressure flows in and out are respectively installed on the rear surface of the horizontal cylinder 230a, and are connected to separate supply distribution pipes 250a and recovery collection pipes 260a, and these supply distribution pipes 250a and the collection collecting pipe 260a are connected to the ground pressure supply unit 300 through the supply pipe and the recovery pipe.

In addition, a sensor 270a is installed between the horizontal cylinder 230a and the pressure plate 240a to be connected to the automatic displacement gauge 410 of the measurement unit 400 installed on the ground through the wire 420.

Therefore, in such an embodiment, the vertical expansion portion 100 and the horizontal expansion portion 200a are simultaneously installed between one upper and lower plate to improve structural and operability, and the horizontal expansion portion 200a. The operation of is already the same as the operation of the horizontal expansion unit 200 described above will be omitted here.

In addition, as another embodiment of the present invention, when the length of the concrete pile (S) is very long, not only can be installed a plurality of horizontal expansion portion 200, but in some cases not installed on the center of the pile, The horizontal expansion unit 200 may be installed in combination only at the lower end where the vertical expansion unit 100 is installed.

In this case, by installing the test apparatuses required in the present invention at the bottom of the concrete pile (S) at a time, it can be expected to improve the structure, such as simplifying the structure.

As described in detail above, the present invention has an advantage in that accurate measurement is made in any case by allowing to reach the limit according to these measurements in measuring the tip bearing force and the principal surface frictional force of the concrete pile.

In addition, since the support load of the concrete piles that have already been poured can be artificially increased even after the construction is completed, there is an advantage in that the end support force and the principal friction which are always required under any conditions can be obtained.

Claims (23)

In the device for measuring the load capacity of the concrete pile, A vertical expansion unit installed at the tip of the concrete pile placed in the hole of the strata and expanding at least two cylinders by the action of hydraulic pressure transmitted from the outside to apply upward and downward forces; A horizontal expansion part installed at a predetermined position, which is an intermediate part of the concrete pile, to apply outward force to the inner circumferential surface of the hole by expansion of at least two horizontal cylinders by hydraulic pressure; A hydraulic pressure supply unit which is installed on the ground and supplies hydraulic pressure to each cylinder of the vertical expansion unit and the horizontal expansion unit by a pump; And a measuring means for sensing the displacements of the vertical and horizontal expansion parts to measure the displacement by the automatic displacement gauge on the ground. The method of claim 1, The vertical expansion unit 100 is a support load measuring device of the concrete piles placed on the ground, including a plurality of installed at a predetermined interval at a predetermined position of the concrete pile (S) to be placed on the ground. The method of claim 1, Apparatus for measuring the support load of the concrete piles placed on the ground, characterized in that the vertical expansion portion 100 is configured to install the horizontal expansion portion 200 in combination. The method of claim 1, The vertical expansion portion 100 is the upper and lower plates 110 and 120 installed at the tip of the concrete pile (S) poured in the hole (H) of the ground layer; At least two or more are vertically installed between the upper and lower plates 110 and 120, and the upper and lower pistons 131 and 132 are respectively installed on the upper and lower plates 110 and 120 to move forward and backward simultaneously. A cylinder 130; A supply distribution pipe 150 and a collection and collection pipe 160 installed between the upper and lower plates 110 and 120 to collectively supply and recover hydraulic pressure to each cylinder 130 from the outside; Installed between the cylinder 130 and the pistons 131 and 132, respectively, sensors 140 and 141 for measuring the displacement of the upper and lower pistons; Support load measuring device. The method of claim 4, wherein The lower plate 120 is formed at least smaller than the upper plate 110 to reduce the cross-sectional area in contact with the bottom surface of the hole (H) support load measuring device of the concrete pile (S) placed on the ground. The method of claim 4, wherein The upper and lower pistons 131 and 132 of the cylinder 130 are integrally connected to the upper and lower plates 110 and 120 so that the up and down forces according to the lifting operation are configured to be directly transmitted. Supporting load measuring device for poured concrete piles. The method of claim 6, The cylinder 130 is a support load measuring device of the concrete piles installed on the ground, characterized in that it is equipped with a stop means for preventing the backward operation while allowing the forward operation of the upper and lower pistons (131, 132). The method of claim 7, wherein The stop means is formed with a stopper 135 which is rotated by the spring 136 on one side of the cylinder 130, and the stopper 135 is engaged with the piston 131, 132, the forward operation is A support load measuring device for concrete piles placed on the ground, characterized in that a stop gear (137) is formed that does not permit the reverse operation. The method of claim 4, wherein The supply distribution pipe 150 is a cylindrical pipe is formed in a circular shape is connected to the inlet 232 of each cylinder 130, and is connected to the hydraulic pressure supply unit 300 and the supply pipe 151 of the ground to receive water pressure from each cylinder 130 Supporting load measuring device of concrete piles placed on the ground, characterized in that configured to supply at the same time. The method of claim 4, wherein The recovery collection pipe 160 is connected to the outlet 134 of each cylinder 130 while the cylindrical pipe is formed in a circular shape, is connected to the hydraulic pressure supply unit 300 and the recovery pipe 161 of the ground each cylinder 130 Supporting load measuring device of the concrete piles placed on the ground, characterized in that configured to recover the hydraulic pressure from. The method of claim 4, wherein The sensor 140, 141 is provided on one side of each cylinder 130 is placed on the ground, characterized in that the connection is composed of the automatic displacement meter 410 and the wire 420 of the measuring unit 400 is installed on the ground Load measuring device for concrete piles. The method according to claim 4 or 11, wherein The sensor 140, 141 is one side end is installed in the outer surface of the cylinder 130, the upper and lower symmetrical with the bracket 142, while the other end is the upper and lower pistons 131, 132, respectively Supporting load measuring device of concrete piles placed on the ground, characterized in that the connection is configured to measure the displacement amount according to the retraction operation. The method of claim 1, The horizontal expansion unit 200 is the upper and lower plates 210 and 220 are installed at a predetermined position in the center of the concrete pile (S) to be placed in the hole of the ground layer; At least two or more are horizontally installed between the upper and lower plates 210 and 220 and provided with a curved pressure plate 240 at the front end of the piston 231 to be retracted outward to apply frictional force to the inner circumferential surface of the hole. A horizontal cylinder 230; A supply distribution pipe 250 and a collection collection pipe 260 installed between the upper and lower plates 210 and 220 to collectively supply and recover hydraulic pressure to each cylinder 230 from the outside; Supported by the concrete piles installed on the ground, characterized in that it comprises; a sensor 270 is provided at a predetermined position of each of the horizontal cylinders 230 to sense the displacement of the pressure plate 240 to measure through the automatic displacement gauge on the ground; Load measuring device. The method of claim 13, The supply distribution pipe 250 is connected to the inlet 232 of each cylinder 230, the cylindrical pipe is formed in a circular shape, connected to the hydraulic pressure supply unit 300 and the supply pipe 251 of the ground to each cylinder 230 A device for supporting loads of concrete piles placed on the ground, characterized by being configured to distribute and supply water pressure evenly. The method of claim 13, The recovery collection pipe 260 is connected to the discharge port 233 of each cylinder 230, the cylindrical pipe is formed in a circular shape, each cylinder 230 is connected to the hydraulic pressure supply unit 300 and the recovery pipe 261 of the ground Supporting load measuring device of the concrete piles placed on the ground, characterized in that configured to recover the hydraulic pressure from. The method of claim 13, The sensor 270 is installed in each cylinder 230, the load support measuring device of concrete piles installed on the ground, characterized in that configured to be connected to the ground automatic displacement gauge and the wire. The method according to claim 13 or 16, The sensor 270 is a concrete pile placed on the ground, characterized in that the one end is connected to the front end of the cylinder 130 and the other end is connected to the pressure plate 240 to measure the displacement amount according to its advance and retraction operation Load bearing measuring device. The method of claim 13, The pressing plate 240 is configured to be in close contact with the inner circumferential surface of the hole, but the support load measuring device of the concrete piles poured on the ground comprising a direct connection to the piston (231). The method according to claim 13 or 17, Support load measuring device of the concrete piles placed on the ground, characterized in that the front surface of the pressing plate 240 is provided with an uneven surface. The method of claim 1, The hydraulic pressure supply unit 300 is a pump 330 for supplying hydraulic pressure to each cylinder of the vertical expansion unit 100 and the horizontal expansion unit 200 while being installed in the beam 310 on the ground, A water tank to supply water by the pumping force of the pump 330, A plurality of valves 320 and 321 installed in the supply pipes 151 and 251 to control the water to be supplied; It is installed on the recovery pipes (161, 261) of the vertical expansion unit 100 and the horizontal expansion unit 200, the ground characterized in that it comprises a discharge valve 360, 361 to control the discharge of water pressure Load bearing measuring device for concrete pile The method of claim 20, On the supply pipe of the hydraulic pressure supply unit 300, the support load measuring device of the concrete pile placed on the ground, characterized in that configured to connect the grout supply tank 350 to supply the grout supplied after the end of the test. The method of claim 1, The measuring unit 400 is a sensor (140), 141, 270 and the wire 420 of the automatic displacement meter 410 and the vertical expansion unit 100 and the horizontal expansion unit 200 is installed on the ground Supporting load measuring device of concrete piles placed on the ground, characterized in that the connection is configured. A first step of digging a hole (H) vertically so that the concrete pile (S) can be embedded; A second step of assembling the vertical expansion unit 100 at the lower end of the reinforcing steel used as the skeleton of the concrete pile S and simultaneously assembling the horizontal expansion unit 200 at a predetermined position in the center; A third step of installing the pressure supply unit 300 and the measuring unit 400 on the ground at the same time as inserting the reinforcement skeleton in which the measuring device is assembled into the hole H; A fourth step of pouring concrete piles S by injecting and curing concrete into the holes H by using a tremi tube and the like; A fifth step of supplying water pressure to the vertical and horizontal expansion parts 100 and 200 by the operation of the water pressure supply part 300; Sixth to measure the displacement amount according to the upward force and the downward force of the concrete pile (S) according to the lifting operation of the vertical expansion unit 100 and the horizontal operation of the horizontal expansion unit 200 in the ground measuring unit 400 Steps; When the measurement is completed, the seventh step of performing a gliding process by injecting a high-strength liquid injection material (grout) consisting of cement, sand, water, etc. into all the empty spaces are placed on the ground, characterized in that Method of measuring the supporting load of concrete piles.

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