KR100588761B1 - The bearing capacity measurement equipment and the measuring method of large diameter cast in place reinforced concrete pile using the bi-directions end bearing oil pressure loading equipment using the high-pressure loading system - Google Patents

Abstract

The present invention solves the problems of the arrangement and installation of the hydraulic cylinder by reducing the number of hydraulic cylinders required to meet the conventional required load capacity by building a high pressure loading system using a high pressure hydraulic cylinder and peripheral devices, and each hydraulic The purpose of the present invention is to provide a bearing capacity measuring device and measuring method for large diameter cast-in-place reinforced concrete piles through a bi-directional hydraulic loading device using a high-pressure loading system that solves the problems of the conventional low pressure method such as a problem of adjusting the amount of hydraulic pressure sent to the cylinder. have.

The device for measuring the bearing capacity of large diameter cast-in-place reinforced concrete piles through the bidirectional distal hydraulic loading device using the high-pressure loading system according to the present invention for achieving the above object is made of a circular steel sheet having a predetermined thickness and diameter as a whole. An upper plate and a lower plate having a plurality of through holes formed therethrough, and an upper and lower plate fixing device for fixing the upper plate and the lower plate at regular intervals, and a predetermined position between the rear surface of the upper plate and the upper surface of the lower plate, A loading device comprising a hydraulic cylinder for exerting a hydraulic force and a displacement measuring magnetic sensor installed in an adjacent portion of the hydraulic cylinder and measuring displacement; An upper plate displacement measuring rod installed vertically on an upper surface of the upper plate for measuring displacement of the upper plate, an upper plate displacement measuring rod casing in which the upper plate displacement measuring rod is incorporated, and a lower plate installed vertically on an upper surface of the upper plate for measuring displacement of the lower plate A displacement measuring rod comprising a displacement measuring rod and a lower plate displacement measuring rod casing in which the lower plate displacement measuring rod is embedded; Tremis tube induction device is fixed to the upper surface of the top plate to be installed to guide the through hole, a plurality of reinforcing bars are vertically coupled to the upper surface of the top plate, axial sensor coupled to the outer surface of the reinforcing bar to measure the frictional force of the strata And a sensor wire for concrete and a sensor wire which are installed for the signal and current transmission to the axial sensor and the concrete sister bar, and are coupled with a margin of a certain length so as not to be disconnected by tension, and the axial sensor and the concrete sister It is characterized by consisting of a transition measuring means of the celebration consisting of an automated measuring system for displaying and storing the value measured from the bar.

In addition, the method of measuring the bearing capacity of large-diameter site-pouring reinforced concrete piles through the bi-directional hydraulic loading device using the high-pressure loading system according to the present invention for achieving the above object is perforated the ground to have a constant size and depth vertically downward to the ground Forming a punched hole (I); Installing the bearing capacity measuring apparatus of claim 1 in the drilling hole; Inserting a treme tube to penetrate the loading device of the bearing force measuring device (III); Placing concrete in the tremis tube, but placing concrete into the through hole of the loading device through a tremis tube induction device located under the tremis tube (IV); (V) driving the loading device to expand the hydraulic cylinder when the concrete is cured; After the expansion of the hydraulic cylinder is completed, measuring the displacement of the upper and lower sides of the loading device using a displacement measuring rod, and measuring the frictional force of the ground layer in contact with the concrete by using the transition measuring means during the celebration (VI) ); It is characterized in that the step (축하) to create a distribution during the axial load with the measured frictional force.

High pressure loading system, hydraulic loading device, large diameter, site casting, reinforced concrete pile,

Description

Bearing capacity measurement equipment and the measuring method of large diameter cast in place reinforced concrete pile using the bi-directions end bearing oil pressure loading equipment using the high-pressure loading system}

1 is an exemplary view showing a bearing capacity measuring device of large diameter cast-in-place reinforced concrete piles through a bi-directional hydraulic loading device using a high-pressure loading system according to the present invention,

Figure 2 is an enlarged front view showing the lower end of the bearing capacity measuring apparatus according to the present invention,

3 is a plan view 1 showing the lower end of the bearing capacity measuring apparatus according to the present invention;

4 is a plan view 2 showing the lower end of the bearing capacity measuring apparatus according to the present invention;

5 is a schematic diagram showing a connection state of the hydraulic cylinder for the loading process;

6 is a sensor layout for measuring the frictional stress for each layer;

7 is an exemplary view showing a state in which a sensor wire is attached to the rebar,

8 is an exemplary view showing a state in which a bearing capacity measuring apparatus according to the present invention is installed,

Figure 9a is a graph showing the distribution of the main surface friction force step by step load,

9b is a graph showing the tip load,

Figure 9c is a graph showing the distribution of the main surface friction force for each load stage changed in the absence

9D is a graph depicting the distribution chart during celebrations.

Explanation of symbols on the main parts of the drawing

100: loading device 110: top plate

112: through hole 120: bottom plate

122: through hole 130: upper and lower plate fixing device

140: hydraulic cylinder 150: displacement measuring magnetic sensor

200: displacement measuring rod 210: top plate displacement measuring rod

220: upper plate displacement measuring rod casing 230: lower plate displacement measuring rod

240: lower plate displacement measuring rod casing 250: pile head displacement measuring rod

300: transition measurement means during celebration 310: tremi tube induction device

320: rebar 325: rebar connector

330: Celebration sensor 340: Sister bar

350: sensor wire 352: margin

360: automated measuring system 370: hydraulic pump

380: distributor 390: hydraulic hose

C: Concrete H: Hole

T: Tremi Tube

The present invention is a large diameter on-site reinforced concrete pile through a bi-directional end hydraulic loading device using a high-pressure loading system for measuring the bearing capacity and settlement and the distribution distribution of large diameter on-site reinforced concrete piles used as foundation piles in civil engineering and construction fields The present invention relates to a bearing measuring device and a measuring method.

The method of determining the ultimate vertical bearing capacity of the current pile is based on the empirical formula, wave equation, and pile analysis code based on the pile static load test, static and dynamic load test, dynamic load test, static bearing capacity formula, dynamic bearing capacity formula, and field test results. 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, the pile static load test is subject to a lot of constraints such as air and field conditions because it requires a selection and installation method of a pressurization and reaction system for a load load, and a wide test site.

In addition, large diameter cast-in-place piles have a very large load acting 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 entire structure.

In addition, by drilling on the ground at the site and curing by pouring concrete, a large change may occur in the bearing capacity of the site-placed piles according 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, 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 load by the tip bearing force and the principal friction of the pile generated by the load, so that a large load capacity such as a 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, which can be applied to narrow test spaces or inclined areas, is proposed.

It shows the phenomenon in which the concrete is poured after the support load measuring device using the conventional Oosterberg cell is introduced into the ground. The conventional support load measuring device using the Osterberg cell includes a flat top plate and a bottom plate and a bottom of the top plate. Displacement meter for measuring the displacement of the upper and lower plates and the connecting member joining the upper and lower plates by welding the cylinder consisting of a piston in contact with the body and the body in contact with the upper surface of the lower plate and the both ends are welded to the lower and upper surfaces of the lower plate, respectively. It consists of a structure.

The support load measuring apparatus using the conventional osterberg cell having the structure as described above seats the osterberg cell after the foundation concrete placed on the bottom surface of the hole is cured to have a rigidity of a predetermined size or more, Since the concrete must be poured to form concrete piles after the mounting is completed, it takes a very long time to measure the supporting load.

In addition, the foundation concrete and concrete piles have different sizes of strength because the concrete pouring time and curing time are different even if they are manufactured after the same concrete.

Therefore, since the concrete pile 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, the conventional load bearing device using the Osterberg cell has a problem of low reliability.

In addition, the concrete pile used in the actual construction site is used reinforced concrete piles with reinforcement reinforced inside, the conventional support load measuring device using the Osterberg cell to measure only the support load of the unreinforced concrete piles The disadvantage is that it can.

Thus, in order to solve the above problems, Patent Publication No. 10-2005-2682 support load measuring apparatus has been proposed.

Looking at the technical configuration, a tip force measuring device including a top and bottom plate and a cylinder coupled between the top and bottom plate and a displacement measuring rod for measuring the displacement of the top and bottom plate; A plurality of reinforcing bars coupled to an upper surface of the tip force measuring device; Coupled to the reinforcement is a structure consisting of a transition measurement means during the axial measurement of the friction of the strata.

The conventional support device measuring device having the structure as described above has a problem that the size of the foundation pile is limited so that the number of hydraulic cylinders cannot be increased indefinitely and thus cannot accommodate the necessary loading capacity.

In addition, when the number of hydraulic cylinders increases, it is difficult to precisely control the loads to be loaded because it is difficult to control the amount of hydraulic pressure sent to each cylinder in the same manner.

Accordingly, the present invention has been made to solve the problems described above, to build a high-pressure loading system using a high-pressure hydraulic cylinder and peripheral devices to reduce the number of hydraulic cylinders required to meet the conventional required load capacity. Large diameter on-site casting through two-way hydraulic loading device using a high pressure loading system that solves the problems of the conventional low pressure method such as solving the problems of the hydraulic cylinder layout and installation by reducing, and the problem of adjusting the amount of hydraulic pressure sent to each hydraulic cylinder. The purpose of the present invention is to provide a bearing capacity measuring apparatus and a measuring method for reinforced concrete piles.

In addition, during loading test by bi-directional hydraulic loading device using high pressure loading system, a sensor for measuring the transition during the installation was installed on the foundation pile of the test object to obtain the distribution of the celebration during each pile depth to obtain the principal surface friction distribution for each strata. Another object of the present invention is to provide a bearing capacity measuring device and a measuring method for large diameter cast-in-place reinforced concrete piles using a two-way hydraulic loading device using a loading system.

The device for measuring the bearing capacity of large diameter cast-in-place reinforced concrete piles through the bidirectional distal hydraulic loading device using the high-pressure loading system according to the present invention for achieving the above object is made of a circular steel sheet having a predetermined thickness and diameter as a whole. An upper plate and a lower plate having a plurality of through holes formed therethrough, and an upper and lower plate fixing device for fixing the upper plate and the lower plate at regular intervals, and a predetermined position between the rear surface of the upper plate and the upper surface of the lower plate, A loading device comprising a hydraulic cylinder for exerting a hydraulic force and a displacement measuring magnetic sensor installed in an adjacent portion of the hydraulic cylinder and measuring displacement;

An upper plate displacement measuring rod installed vertically on an upper surface of the upper plate for measuring displacement of the upper plate, an upper plate displacement measuring rod casing in which the upper plate displacement measuring rod is incorporated, and a lower plate installed vertically on an upper surface of the upper plate for measuring displacement of the lower plate A displacement measuring rod comprising a displacement measuring rod and a lower plate displacement measuring rod casing in which the lower plate displacement measuring rod is embedded;

Tremis tube induction device is fixed to the upper surface of the upper plate to be installed to guide the through hole, a plurality of reinforcing bars vertically coupled to the upper surface of the upper plate, axial sensor coupled to the outer surface of the reinforcing bar to measure the frictional force of the strata And a sensor wire for concrete and a sensor wire which are installed for the signal and current transmission to the axial sensor and the concrete sister bar, and are coupled with a margin of a certain length so as not to be disconnected by tension, and the axial sensor and the concrete sister It is characterized by consisting of a transition measuring means of the celebration consisting of an automated measuring system for displaying and storing the value measured from the bar.

In addition, the method of measuring the bearing capacity of large diameter cast-in-place reinforced concrete piles using a bi-directional hydraulic loading device using the high-pressure loading system according to the present invention for achieving the above object is perforated the ground to have a constant size and depth vertically downward to the ground Forming a punched hole (I);

Installing the bearing capacity measuring apparatus of claim 1 in the drilling hole; Inserting a treme tube to penetrate the loading device of the bearing force measuring device (III); Placing concrete in the tremis tube, but placing concrete into the through hole of the loading device through a tremis tube induction device located under the tremis tube (IV);

(V) driving the loading device to expand the hydraulic cylinder when the concrete is cured; After the expansion of the hydraulic cylinder is completed, measuring the displacement of the upper and lower sides of the loading device using a displacement measuring rod, and measuring the frictional force of the ground layer in contact with the concrete by using the transition measuring means during the celebration (VI) ); It is characterized in that the step (축하) to create a distribution during the axial load with the measured frictional force.

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

1 is an exemplary view showing a bearing capacity measuring device of large diameter cast-in-place reinforced concrete piles through a bi-directional hydraulic loading device using a high-pressure loading system according to the present invention, Figure 2 is an enlarged bottom portion of the bearing capacity measuring apparatus according to the present invention 3 is a plan view 1 showing the lower end of the bearing capacity measuring apparatus according to the present invention, FIG. 4 is a plan view 2 showing the lower part of the bearing capacity measuring apparatus according to the present invention, and FIG. Figure 6 is a schematic diagram showing a connection state of the hydraulic cylinder, Figure 6 is a sensor arrangement for measuring the frictional stress for each layer, Figure 7 is an exemplary view showing a state in which the sensor wire is attached to the reinforcing bar, Figure 8 is the present invention Figure 9 is an exemplary view showing a state in which the bearing capacity measuring apparatus is installed, Figure 9a is a graph showing the distribution of the main surface friction force step by step load, Figure 9b is a front end load 9C is a graph showing the distribution of the main surface friction force for each load stage changed in the absence of the two members, and FIG. 9D is a graph showing the distribution of the axis.

As shown in these drawings, the bearing capacity measuring device of large diameter cast-in-place reinforced concrete piles through the bi-directional hydraulic loading device using the high-pressure loading system according to the present invention is made of a circular steel sheet having a predetermined thickness and diameter as a whole, concrete The upper plate 110 and the lower plate 120 having a plurality of through holes 112 and 122 formed therethrough, and the upper and lower plate fixing devices 130 fixing the upper plate 110 and the lower plate 120 at regular intervals. And a hydraulic cylinder 140 installed at a predetermined position between the rear surface of the upper plate 110 and the upper surface of the lower plate 120 to exert a hydraulic force, and an adjacent portion of the hydraulic cylinder 140. A loading device 100 provided with a displacement measuring magnetic sensor 150 for measuring displacement;

In order to measure the displacement of the upper plate 110, the upper plate displacement measuring rod 210 installed perpendicular to the upper surface of the upper plate 110, and the upper plate displacement measuring rod casing 220, the upper plate displacement measuring rod 210 is built-in and In order to measure the displacement of the lower plate 120, the lower plate displacement measuring rod 230 installed perpendicular to the upper surface of the upper plate 110 and the lower plate displacement measuring rod casing 240 having the lower plate displacement measuring rod 230 built therein. Displacement measuring rod 200 made of;

On the upper surface of the upper plate 110, Tremi tube guide device 310 is fixed to guide the concrete to the through-holes 112, and a plurality of reinforcing bars 320 are vertically coupled to the upper surface of the upper plate 110, Coupled to the outer surface of the reinforcement 320 and the signal and current transmission to the jungjung sensor 330 and concrete sister bar 340 for measuring the frictional force of the strata, and the jungjung sensor and concrete sister bar 340 Display the measured value from the sensor wire 350 and the sensor wire 330 and the concrete sieve bar 340 which are installed for the same time and are coupled with a margin 352 of a certain length so as not to be disconnected by tension. And a transition measuring means 300 in celebration composed of an automated measurement system 360 for storing.

That is, the bearing capacity measuring device of the large diameter cast-in-place reinforced concrete piles through the bidirectional distal hydraulic loading device using the high-pressure loading system according to the present invention is the loading device 100, the displacement measuring rod 200 and the transition measuring means during the celebration ( 300 is an organically combined device.

In particular, the present invention is to build a high-pressure loading system using a high-pressure hydraulic cylinder 140 and the peripheral device to secure the required load capacity, which is a problem of the conventional low-pressure hydraulic cylinder to increase the number of low-pressure hydraulic cylinder more than necessary By reducing, it is possible to overcome the problems in the arrangement and installation of the low-pressure hydraulic cylinder, and also has the feature that can smoothly adjust the amount of hydraulic pressure sent to each high-pressure hydraulic cylinder (140).

Here, the loading device 100 is composed of the upper plate 110, lower plate 120, upper and lower plate fixing device 130, the hydraulic cylinder 140 and the displacement measuring magnetic sensor 150.

At this time, the upper plate 110 and the lower plate 120 is made of a circular steel plate having a predetermined thickness and diameter as a whole, a plurality of through-holes 112, 122 is formed so that the concrete passes.

In addition, the upper and lower plate fixing device 130 is a member for fixing the upper plate 110 and the lower plate 120 at regular intervals.

And the hydraulic cylinder 140 is a high-pressure hydraulic cylinder (1000kgf / ㎠) 140 is configured as a single-acting or double-acting.

Here, in the case of using the single-actuated hydraulic cylinder, the hydraulic cylinder stroke after the end of the test is not completely restored, so that a gap occurs in the pile, resulting in a structural problem.

On the other hand, when the double-acting hydraulic cylinder is used, the problem of the single-acting type can be solved by returning the stroke that has occurred in the pump to the original state after the end of the test.

Therefore, it is preferable to use a double-acting hydraulic cylinder rather than a single-acting type.

Other high pressure hydraulic hose 390 and distributor 380, high pressure hydraulic pump 370, load and pressure regulator (not shown) is installed structure.

That is, the hydraulic cylinder 140 is installed in the hydraulic hose 390, the same number as the hydraulic cylinder 140 in the distributor 380 of the high pressure hydraulic pump 370 to adjust the plurality of high pressure hydraulic cylinder 140. The high pressure hydraulic hose 390 is connected, by connecting the high pressure hydraulic cylinder 140 to the high pressure hydraulic hose 390 is configured to deliver the hydraulic pressure to the high pressure hydraulic cylinder 140 individually.

Here, the operation of the hydraulic cylinder 140 as described above is installed between the upper plate 110 and the lower plate 120 of the loading device 100, a high-pressure hydraulic cylinder 140 to secure the required loading capacity, In order to individually adjust the high pressure hydraulic cylinder 140, the high pressure hydraulic hose 390 is installed in the distributor 380 installed in the hydraulic pump 370 as many times as the high pressure hydraulic cylinder 140, and the high pressure hydraulic pump 370 is installed. Operate and apply pressure to the high pressure hydraulic cylinder 140.

At this time, the pressure is adjusted by looking at the number displayed on the load and pressure gauge (not shown).

More specifically, the hydraulic cylinder 140 will be described. In order to apply pressure to the hydraulic cylinder 140, the hydraulic pump 370 generates a pressure through each hydraulic cylinder 390 connected to the hydraulic hose 390 connected to the distributor 380. To 140).

At this time, the pressure of each hydraulic cylinder 140 should be the same and the same pressure provided by the hydraulic pump (370).

However, when the number of hydraulic cylinders 140 increases, the number of hydraulic hoses 390 increases, which makes it difficult to control the same pressure. Therefore, a problem arises in the reliability of reloading, and the load generated in each hydraulic cylinder 140 The problem that load eccentricity occurs due to the difference is expected.

Therefore, when the high pressure hydraulic cylinder 140 is used, the number of cylinders is reduced, so the quantity of the hydraulic hose 390 is reduced, thereby ensuring the stability and reliability of the load.

In addition, when the hydraulic cylinder 140 of the high pressure (1000kgf / ㎠ or more) using the hydraulic cylinder 140 of the same cylinder cross-section can be secured more load capacity than the low-pressure hydraulic cylinder.

That is, when the pile diameter is 1500mm and the required load capacity is 6000tonf, if the low pressure hydraulic cylinder (700㎏f / ㎠) is used, 10 cylinders are required, so it cannot be arranged, but the high pressure hydraulic cylinder (1500㎏f / ㎠) (140 ) Requires less than 5 cylinders, which facilitates placement and makes testing of bearing capacity much easier.

Therefore, it is possible to overcome the limitation of the loading capacity due to the efficient arrangement of the high pressure hydraulic cylinder 140 for the predetermined cross-sectional size of the foundation pile.

In addition, it is possible to reduce the number of piles by greatly confirming the pile support capacity.

The displacement measuring magnetic sensor 150 is a device for measuring the displacement between the upper plate 110 and the lower plate 120.

On the other hand, the displacement measuring rod 200 is the upper plate displacement measuring rod 210, the upper plate displacement measuring rod casing 220, the lower plate displacement measuring rod 230, the lower plate displacement measuring rod casing 240 and the pile head displacement measuring rod ( 250).

Here, the data measured by the displacement measuring magnetic sensor 150, the upper plate displacement measuring rod 210, the lower plate displacement measuring rod 230 and the pile head displacement measuring rod 250 is transferred to the automated measuring system 360 to automatically Are calculated and stored.

Therefore, the support load of the ground can be calculated by measuring the expansion force of the hydraulic cylinder 140 and the displacement of the upper plate 110 and the lower plate 120 by the automated measuring system 360.

Here, the upper plate displacement measuring rod 210 and the lower plate displacement measuring rod 230 is installed perpendicular to the upper surface of the upper plate 110 to measure the displacement of the upper plate 110 and lower plate 120, the upper plate displacement measurement The rod 210 and the lower plate displacement measuring rod 230 are installed in the upper plate displacement measuring rod casing 220 and the lower plate displacement measuring rod casing 240, respectively.

On the other hand, the transition measuring means 300 during the treme tube induction device 310, the reinforcing bar 320, the celebration sensor 330, the concrete sieve bar 340, the sensor wire 350 and the automated measurement system ( 360).

Here, the tremi tube induction apparatus 310 is fixedly installed to guide to the through hole 122 for passing the concrete (C) on the upper surface of the upper plate 110 in the shape of a funnel.

Therefore, when the concrete (C) flowing into the upper plate 110 is poured in the concrete (C) to the tremis tube (T), the upper plate 110 through the tremis tube induction device 310 located in the lower portion of the tremi tube (T) Since it is introduced into the through hole 122 of the upper plate 110, the concrete (C) is tightly filled.

In addition, the reinforcement 320 is installed to form a reinforced concrete pile by pouring concrete (C) is arranged vertically while being arranged in a circle along the outer side of the upper surface of the top plate (110).

 And the jungjung sensor 330 is coupled to the outer surface of the reinforcement 320, when a plurality of the main surface friction for each strata are mounted on the reinforcement 320 so as to fall a predetermined interval in the vertical direction.

In addition, to measure the concrete (C), the sensor bar 340, which is a sensor for concrete, is attached to the reinforcing bar 320.

And the sensor wire 350 is installed for the signal and current transmission to the sensor 330 and the sister bar 340 during the celebration, the rebar 320 with a margin 352 of a certain length so as not to be disconnected by the tension Is coupled to.

That is, the sensor wire 350 is formed with an extra portion 352 in the sensor wire 350 in an S-shape or similar shape so that the sensor wire 350 is not disconnected by tension, in particular, the sensor wire 350 is a reinforcement 320. It is fixed at the same time and connected to the automated measurement system 360.

In addition, the automated measurement system 360 is a system for displaying and storing the values measured from the sensor 330 and the concrete sieve bar 340 during celebration.

Hereinafter, a description will be given of a bearing capacity measuring method using a bearing capacity measuring device of large diameter cast-in-place reinforced concrete piles through a bi-directional hydraulic loading device using a high-pressure loading system according to the present invention having the configuration as described above.

The method for measuring the bearing capacity of large-diameter site-pouring reinforced concrete piles using a bidirectional distal hydraulic loading device using a high-pressure loading system according to the present invention forms a perforation hole by drilling the ground to have a predetermined size and depth vertically downward to the ground. Step (I);

Installing (II) the support force measuring apparatus in the drilling hole (H); Inserting a tre tube (T) to penetrate the loading device (100) of the bearing force measuring device (III); The concrete (C) is poured into the tremis tube (T), the concrete through the through hole 112 of the loading device 100 through the tremis tube guide device 310 located in the lower portion of the tremi tube (T) ( Pouring C) (IV); (V) driving the loading device 100 to expand the hydraulic cylinder 140 when the concrete C is cured; When the expansion of the hydraulic cylinder 140 is completed, the displacement of the upper and lower surfaces of the loading device 100 by using the displacement measuring rod 200, and the concrete using the transition measuring means 300 during the celebration Measuring the frictional force of the strata in contact with (C) (VI); The bearing force is measured by sequentially performing the step (iii) of creating a distribution distribution during the axial with the measured frictional force.

Here, the distribution distribution of the axial load is to measure the strain of the pile member in any two member load stage, and convert it to the pile axial load to show the axial distribution chart, showing this for the representative loading stages do.

In the following, the procedure for creating a distribution diagram in celebration is as follows.

During the celebration of the distribution chart () is the first step of measuring the value of the measuring sensor during pile loading (별로 -1).

Subsequently, it is a step (Ⅶ-2) of calculating a pile principal surface frictional force at an arbitrary loading step using the measured sensor value and preparing a distribution chart according to depth.

At this time, the net principal friction should be obtained in consideration of the weight of the pile.

Subsequently, it is the step (Ⅶ-3) of converting to the celebratory transition distribution of the pile head shed so that it can be used to prepare the celebratory distribution map.

Subsequently, the step (Ⅶ-4) is to find the tip bearing force corresponding to the downward displacement equal to the upward displacement measured in any loading step.

Subsequently, it is the step (X-5) of constructing the axial distribution diagram in any load step by adding the tip bearing force obtained in the above step (X-4) to the principal surface friction force constructed in Step (X-3).

Subsequently, repeating the processes of Steps V-2 to V-5 for the representative load stage is a step of completing the distribution diagram in celebration (X-6).

Therefore, the bearing capacity measuring method measured through the steps as described above has an effect of accurately measuring the bearing capacity and settlement of the large-diameter cast-in-place reinforced concrete piles.

As described above, the bearing capacity measuring apparatus and measuring method of the large-diameter site-pouring reinforced concrete piles through the bi-directional hydraulic loading device using the high-pressure loading system according to the present invention has the following effects.

First, the present invention has the advantage of overcoming the limitation of the loading capacity due to the efficient arrangement of the hydraulic cylinder for a predetermined cross-sectional size of the foundation pile.

Second, the present invention has the advantage that the manufacturing cost of the test apparatus is reduced by reducing the number of hydraulic cylinders.

Third, the present invention has the advantage of reducing the number of piles by increasing the allowable bearing capacity of the pile by double confirming the pile support capacity.

Fourth, the present invention has the advantage that the number of cylinders is reduced by using a hydraulic cylinder, the number of hydraulic hoses is reduced, thereby ensuring the stability and reliability of the load.

Claims (6)

delete The upper plate 110 and the lower plate 120 and the upper plate 110 and the lower plate 120 are formed of a circular steel plate having a predetermined thickness and diameter as a whole, and a plurality of through holes 112 and 122 are formed to allow concrete to pass therethrough. The upper and lower plate fixing device 130 for fixing each other at regular intervals, and is installed at a predetermined position between the rear surface of the upper plate 110 and the upper surface of the lower plate 120, the hydraulic cylinder exerts a hydraulic force A loading device (100) installed at an adjacent portion of the hydraulic cylinder (140) and comprising a displacement measuring magnetic sensor (150) for measuring displacement; In order to measure the displacement of the upper plate 110, the upper plate displacement measuring rod 210 installed perpendicular to the upper surface of the upper plate 110, and the upper plate displacement measuring rod casing 220, the upper plate displacement measuring rod 210 is built-in and In order to measure the displacement of the lower plate 120, the lower plate displacement measuring rod 230 installed perpendicular to the upper surface of the upper plate 110 and the lower plate displacement measuring rod casing 240 having the lower plate displacement measuring rod 230 built therein. Displacement measuring rod 200 made of; On the upper surface of the upper plate 110, Tremi tube guide device 310 is fixed to guide the concrete to the through-holes 112, and a plurality of reinforcing bars 320 are vertically coupled to the upper surface of the upper plate 110, Coupled to the outer surface of the reinforcement 320 and the signal and current transmission to the jungjung sensor 330 and concrete sister bar 340 for measuring the frictional force of the strata, and the jungjung sensor and concrete sister bar 340 Display the measured values from the sensor wire 350 and the sensor wire 330 and the concrete sister bar 340 during the installation and at the same time coupled with a margin 352 of a certain length so as not to be disconnected by the tension. And bearing capacity measuring device of large diameter cast-in-place reinforced concrete piles by bidirectional tip hydraulic loading device using high-pressure loading system composed of axial transition measuring means 300 consisting of automatic measuring system 360 for storing. In The hydraulic cylinder 140 is composed of a double-acting hydraulic cylinder, installed in the hydraulic hose 390, the hydraulic cylinder to the distributor 380 of the high pressure hydraulic pump 370 to adjust the plurality of high pressure hydraulic cylinder 140. The same number of high-pressure hydraulic hose 390 and the same as the 140, and connected to the high-pressure hydraulic cylinder 140 to the high-pressure hydraulic hose 390 is characterized in that the hydraulic pressure is individually delivered to the high-pressure hydraulic cylinder 140. Bearing capacity measuring device for large diameter cast-in-place reinforced concrete piles through bi-directional hydraulic loading device using high pressure loading system. delete delete delete delete

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