KR20100083620A - Method for connecting upper and lower steel structures and for protecting rising of tubes for withdrawal materials in liad tested pile load on both way - Google Patents

Abstract

PURPOSE: A method for connecting upper and lower steel structures of a pile for a bidirectional loading test for protecting an outlet pipe for rising up is provided to measure bearing power of a pile and to stably place a reinforcing bar structure. CONSTITUTION: A pipe for a bidirectional loading test comprises upper and lower reinforcing bar structures(7,8), a bearing power measuring unit(11), a convey unit(12), and a guide pipe(13). The upper and lower reinforcing bar structures are successively installed in a vertically excavated hole(10) with tremie pipes(9). The bearing power measuring unit is coupled between the upper and lower reinforcing bar structures. The convey unit is installed inside the bearing power measuring unit and moves power supplying devices(115) toward the center part of the guide pipe.

Description

Method for connecting upper and lower steel structures and for protecting rising of tubes for withdrawal materials in liad tested pile load on both way}

The present invention relates to the upper and lower reinforcing bar structural connection of the pile for the bi-directional loading test and to the recovery pipe withdrawal prevention device, and more specifically, in the process of measuring the bearing capacity of the pile by applying a real load to the cast-in-place large diameter concrete pile In the loading test device of the pile having a removable force device configured to recover and reuse the force device used to reproduce the load when the structure is constructed, the load is applied after the bidirectional loading test of the pile. The extension of the reinforcing bar protruding to the bottom of the upper plate is connected to the upper and lower reinforcing structure when the device is removed from the upper, lower plate and the cylindrical body through the withdrawal guide tube of the recovery object, and then poured into the concrete. It is integrated with the rebar coupling piece of the lower plate auxiliary cylinder, The upper reinforcing structure and the lower reinforcing structure connected to the lower plate are structurally integrated so that the piles can effectively resist the pulling force, and the bearing measuring device, the withdrawal guide pipe and the upper and lower parts integrated with them When the reinforcing structure is put into the excavation hole filled with groundwater, it is invented so that the construction of the site-placement pile can proceed smoothly by allowing it to rest stably on the bottom of the excavation hole without being floated by buoyancy caused by the groundwater.

In general, the bearing capacity and settlement of pile foundations can be estimated by various theoretical and empirical methods.

The method of determining the ultimate vertical bearing capacity of the pile currently used includes methods using load tests such as pile vertical load test, dynamic and dynamic load test, and dynamic load test, and empirical formulas based on the static bearing capacity formula, dynamic bearing capacity formula, and field test results. These methods include the use of bearing formulas, such as wave equations, pile analysis codes, and continuum estimates, among which the reliability of pile vertical load tests is the highest.

The pile vertical load test is a kind of physical test, which has the advantage of high reliability because it reproduces when the actual superstructure is constructed by applying a real load to the pile.

However, the pile vertical load test requires a pressurization device for loading a load, a method of selecting and installing a reaction system, a wide test site, etc., so that the air and field conditions are restricted, and much cost and time are required. In particular, in the case of large diameter cast-in-placement piles, the bearing capacity of one pile is very large, and it is very difficult to measure the vertical bearing capacity by applying the load to the pile head and measuring the bearing capacity. Failure to do so can have a devastating effect on the usability and stability of the structure as a whole.

In addition, in the process of perforating the ground for the construction of the cast-in-place piles and laying the concrete, the carelessness of the cast-in-place piles can be greatly changed due to carelessness or unexpected changes in the ground conditions. When designing using the design allowable bearing capacity estimated from the soil mechanics, designers have no choice but to conservatively design, which is a big waste in the national level.

In order to solve this problem, when installing the pile in the field by installing a high-pressure hydraulic jack in the pile by using the end bearing force and the frictional force of the pile generated by the load load as a mutual reaction against the load It does not require a large load capacity like the vertical load test, does not require separate load devices and reaction devices, and supports load measuring devices using Osterberg cells that can be applied in narrow test spaces or inclined areas (US 5,576, 494). It has been proposed.

As shown in FIG. 1, the support load measuring apparatus using the conventional osterberg cell has a flat plate-shaped upper plate 1 and lower plate 2 and a cylinder rod 3-2 coupled to the bottom surface of the upper plate 1. ) And a cylinder (3) composed of a body (3-4) in contact with the upper surface of the lower plate (2), and both ends are welded to the lower surface of the upper plate (1) and the upper surface of the lower plate (2), respectively. ) And the connecting member 4 for coupling the lower plate 2, the displacement meter 5 for measuring the displacement of the upper plate 1 and the lower plate 2, and the cylinder rod 3-2 by applying hydraulic pressure to the cylinder. It is configured to use an osterberg cell comprising a grouting tube 30 for filling the void generated as it is withdrawn with cement liquid.

At this time, the displacement meter 5 is fixedly coupled to the upper plate 1 to measure the displacement amount of the upper plate 1 and the upper plate displacement meter 5-2, and fixedly coupled to the lower plate 2 to measure the displacement amount of the lower plate 2 It is configured to include a lower plate displacement meter (5-4), and is further provided with a reference beam (6) fixed to the ground so that the vertical distance reference of the upper plate displacement meter (5-2) and the lower plate displacement meter (5-4). .

In addition, the grouting pipe 30 is excessively injected into the gap with the grouting inlet pipe 30-1 for injecting the cement liquid into the gap generated between the upper plate 1 and the lower plate 2 after the support load of the pile is measured. It is composed of a grouting drawing pipe 30-2 for discharging the cement liquid.

Moreover, the said cylinder 3 is comprised so that the cylinder rod 3-2 may be applied through the inflow and withdrawal of water.

In addition, the hole into which the osterberg cell is inserted, because the bottom surface is not formed flat due to the various gravel and foreign substances generated in the process of excavating the hole, the lower plate (2) is installed apart from the pile tip, Place a certain amount of foundation concrete (F) so that it can be fixed horizontally from the bottom.

In the above, when hydraulic pressure is applied to the cylinder (3), the cylinder rod (3-2) is drawn out of the body (3-4), the upper plate (1) and the lower plate (2) is fixed by the connecting member (4) As it is engaged, the position does not move. When the output of the cylinder rod 3-2 is increased and the coupling member 4 is disconnected, the lower plate 2 moves downward to generate the tip bearing force, and the upper plate 1 moves upward with the same force. When moving to give concrete pile (P) generates friction.

In addition, since the load is applied at the tip or any other position other than the head of the concrete pile (P), the main frictional force and the tip support act as reaction forces against each other, so the support load measuring device using the Osterberg cell has a separate load. The support load can be measured without the need for a reaction force.

On the other hand, after the expansion of the Osterberg cell, the cylinder rod (3-2) is drawn out, so that the voids occur between the lower plate (2) and the concrete pile (P) together with the inside of the cylinder (3), the double lower plate (2) The gap between the concrete pile P and the concrete pile P prevents the strength reduction of the pile due to the void generated in the concrete pile P measured by the supporting load by filling the cement liquid through the grouting pipe 3, 3) There was a problem in that the construction quality of the cement liquid filled in the voids in the lower part of the pile could not be prevented due to the voids generated inside.

Therefore, recently, as a way to partially solve this problem, Korean Patent Publication No. 10-2007-0043282 "bidirectional double-acting pile loading test measuring apparatus and measuring method" has been proposed.

Such a double-acting bearing force front end force measuring device and a support load measuring device and measuring method using the same, the upper plate and the lower plate formed in the center of the tremi tube hole for placing concrete in the hole excavated downward in the ground, and the bottom of the upper plate and A double-acting cylinder arranged between the upper and lower plates to evenly apply pressure to the upper surface of the lower plate and coupled to any one of the upper and lower plates, and displacement measuring means for measuring displacement of the upper and lower plates. Bearing capacity measuring device; Grouting pipe for filling the voids generated in the pile due to the displacement of the upper plate and the lower plate with a cement solution as the support load measurement test proceeds; It consists of a number of rebars coupled to the upper and lower surfaces of the bearing gauge.

In such a configuration, after applying the hydraulic pressure to the double-acting cylinder to measure the tip bearing force and the principal friction of the large-diameter cast-in-place pile, the cylinder rod of the double-acting cylinder is returned to its original state in order to minimize the defect of the pile. In order to prevent this from happening and inject the cement solution through the grouting pipe into the space generated between the bottom of the cylinder and the bottom plate so that no empty space is formed inside the pile, the strength of the concrete pile is maintained even after the pile loading test. It is made available.

However, both the double-acting bearing capacity tip force measuring device having the above configuration and the supporting load measuring device using the same, including the support load measuring device using the conventional Osterberg cell, have a high bearing capacity measuring device and the force devices themselves. Since the support loads are measured while they are buried underground with the concrete piles being poured, they are not recovered even after the completion of the support load measurement, and are wastes that remain buried underground, thereby causing unnecessary and enormous economic losses. Of course, there is a problem such as there is no way to check the construction quality for the cement liquid filled in the lower space of the pile through the grouting pipe after measuring the support load of the pile.

Accordingly, the present applicant has developed and proposed a Korean Patent Application No. 10-2008-038272 for the vertical load test device and method of the pile having a removable force device to solve the above problems. Binding the reinforcing bar into a cylindrical shape, and the upper and lower reinforcing structures having different lengths which are sequentially inserted into holes drilled perpendicular to the ground together with the concrete input tremi tubes; In the pile vertical load test device comprising a support force measuring device is provided in the form of a coupling between the upper and lower reinforcing bar structure in the inside of the hole having a plurality of upper and lower plates and a cylindrical body, and a load cell and a hydraulic cylinder And a force device transfer means installed between the bottom and the bottom plate of the force device in the support force measuring device to operate in response to a signal output from a control unit on the ground to move the force device to the center side of the withdrawn object guide tube; It is installed in the form of communicating with the inside of the cylindrical body through the upper plate of the bearing force measuring instrument on the ground to guide the auxiliary facilities such as fluid supply hose and wire connected to the force device and the force device transfer means, as well as the concrete pile After the end bearing force and the measurement of the frictional force of the main surface, when the force devices are moved to the center by the conveying means in the inside of the cylindrical body, the withdrawal guide object collection body that serves to guide the recovery to the ground; is configured.

However, in the vertical load test apparatus of a pile having a removable force device having such a configuration, the upper and lower reinforcement structures that are disposed on the upper reinforcing structure (that is, the upper pile) based on the point where the hydraulic device having the hydraulic cylinder is installed. Since the lower reinforcing bar is not connected to the lower pile, when the concrete is installed in the bearing measuring device consisting of the upper and lower plates and two cylinders and the withdrawal guide pipe after collecting the force device, the inside of the bearing measuring device is free of rebar. Considering that concrete is very vulnerable to tensile force as it is poured into concrete, the bearing measuring part has a problem that structurally is very vulnerable to drawing force.

In particular, for friction piles with small tip bearing capacity, a load measuring device (or a force device and a hydraulic jack) is placed in the middle depth of the pile in order to perform a bidirectional loading test, in which the upper and lower reinforcing bars are disconnected by the bearing tester and loaded. Since the upper and lower plates of the bearing measuring device are also spaced later, when the drawing force acts on the pile, this part becomes very vulnerable to the pulling force, and in some cases, there is a problem that the pile is cut at this part.

In addition, in the proposed test method, the bearing capacity measuring device and the withdrawal guide tube for recovering the object are placed in a digging hole filled with groundwater in a completely sealed state to recover the force device. Withdrawal guide tube and the upper and lower reinforcing bar structure itself provided integrally therewith, such as to rise to the top instead of being seated on the bottom of the excavation hole, causing problems in the construction of the site-pouring pile.

The present invention has been made in order to solve such a conventional problem, a bearing capacity measuring device is installed in the lower end or the middle portion of the pile to measure the tip bearing force and the main surface friction force of the point where the large diameter concrete pile with a large load bearing capacity is buried The heavy lifting device is the upper reinforcing structure at the bottom of the upper plate of the bearing measuring device in which the loading device is installed in the loading test device of the pile having the removable lifting device configured to be recovered and reused to the ground after measuring the end bearing force and the main surface frictional force of the pile. Reinforcement of the reinforcement of the upper reinforcing bar protruding to the bottom of the upper plate even when the loading test is completed by installing the extension of the reinforcement to be installed in the reinforcing bar reinforcing piece integrally bent integrally formed in the auxiliary cylinder of the lower plate Reinforcement of the lower plate secondary cylinder through this extension Reinforcement devices of the reinforcing bar and the lower plate auxiliary cylinder extending from the upper plate of the bearing tester to the bottom when the concrete is poured through the withdrawal guide pipe of the recovery object are removed from the holes drilled in the joining piece. Since the upper reinforcing structure and the lower reinforcing structure connected to the lower plate are structurally integrated, the upper and lower reinforcing steel structure connection and the withdrawal of the withdrawal pipe of the pile for the bidirectional loading test can effectively resist the pulling force. There is a purpose.

Another object of the present invention is to install in the drilling hole filled with groundwater by installing several filters on the upper plate, the lower plate, or the side wall of the cylindrical body of the bearing measuring device in which the force device is installed, without passing the cement particles only. When constructing the pile, only the clean ground water flows into the inside of the sealed capacity tester and the withdrawal guide pipe through the filter, so that the load gauge and the withdrawal guide pipe and the upper and lower reinforcing structures integrated with them are integrated. It is to provide a device for preventing the injury of connecting the upper and lower reinforcing structures of the pile for the bidirectional load test and the withdrawal of the withdrawal pipe, which can be stably settled on the bottom of the excavation hole without being buoyant by buoyancy, so that the construction of the site placing pile can proceed smoothly.

The present invention for achieving the above object, the upper and lower portions of different lengths that are sequentially inserted into the hole excavated perpendicular to the ground with the concrete input trays by binding several reinforcing bars in a cylindrical shape Reinforcing structures; A support force measuring device having a plurality of force devices composed of upper and lower plates, a cylindrical body, a load cell, and a hydraulic cylinder, and installed in the form of a coupling between the upper and lower reinforcing structures in the hole; A force device transfer means installed between the bottom and the bottom plate of the force device in the support force measuring device and operated in response to a signal output from a control unit on the ground to move the force device to the center of the withdrawal guide tube; It is installed in the form of communicating with the inside of the cylindrical body through the upper plate of the bearing force measuring instrument on the ground to guide the auxiliary facilities such as fluid supply hose and wire connected to the force device and the force device transfer means, as well as the concrete pile In the bidirectional load test pile comprising a recovery object take-out guide pipe that guides the recovery of the force devices in the cylindrical body by the transport means after the end bearing force and the main surface friction force is measured. ,

An extension part is formed at the bottom of the reinforcing bar embedded in the upper reinforcing structure, and protrudes through the upper plate of the bearing tester into the bearing tester in which the force device is built, and the extension of the reinforcing bar is integrally formed with the auxiliary cylinder of the lower plate of the bearing tester. It is characterized in that it is installed so as to be inserted into a hole punched in the reinforcing bar coupling piece formed.

In addition, the top plate, the bottom plate, or the side wall of the cylindrical body of the bearing measuring device in which the force device is installed, characterized in that a number of filters are further provided to pass only the water particles without passing the cement particles.

At this time, the filter is characterized in that three to eight installed.

In addition, the filter has a shape of square and round and circular plate or cylinder, as well as molded with foamed polyester so as to have a 100-200㎛ pores.

In the above, the filter having a rectangular, circular, and circular plate shape has a top plate, a bottom plate, or a side wall of a cylindrical body to block several water inflow holes perforated in a predetermined portion in the upper plate, the lower plate, or the side wall of the cylindrical body. After placing on the outer surface it is characterized in that the fixed installation integrally through the fixture.

In addition, in the above-mentioned cylindrical filter, the other end is inserted into a disk which blocks the one end and the perforated pipe which has several water discharge holes perforated in the periphery, and the said porous pipe is installed in the form which protrudes in the inside of a force measuring device. It is characterized in that the welding fixed installation in each of the 3-8 holes drilled in the upper plate, the lower plate or the side wall of the cylindrical body of the bearing capacity measuring instrument.

As described above, according to the device of the present invention, the reinforcing bar embedded in the upper reinforcing structure is extended to the bottom of the upper plate of the bearing measuring device in which the force device is installed, and the extension parts of the reinforcing bars are integrally bent and formed on the auxiliary cylinder of the lower plate. By installing the reinforcing bar into the hole of the reinforcing bar, the reinforcing bar extension of the upper reinforcing bar projecting to the bottom of the upper plate does not fall out of the hole drilled in the reinforcing bar of the lower plate auxiliary cylinder even when the loading test is completed. When the reinforcement devices are recovered and the concrete is placed, the reinforcing bar extending from the upper plate of the bearing measuring device to the bottom by the concrete becomes integral with the reinforcing bar pieces of the lower plate auxiliary cylinder, so the upper reinforcing structure and the lower reinforcing structure connected to the lower plate are structurally It is united, and a pile is effective for pulling power Will be able to resist.

In addition, when installing a pile in the drilling hole filled with groundwater by installing several filters through which only the water particles pass through the top plate, the bottom plate, or the side wall of the cylindrical body of the bearing measuring device in which the force device is installed. The upper and lower reinforcing bar structures, including the bearing tester and the recovery object take-out guide tube, are integrally coupled to each other by buoyancy due to the inflow of clean ground water into the inside of the sealed capacity tester and the take-off guide tube. It can be prevented to be so stable that they are seated on the bottom of the excavation hole is a very useful invention, such as to facilitate the construction of the site-placed piles.

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

Figure 2 shows a longitudinal cross-sectional view of the bidirectional loading test pile was carried out the device of the present invention, Figure 3 is a longitudinal cross-sectional view of the state removing the force device in the bidirectional loading test pile was carried out the device of the present invention, Figure 4 One embodiment of the device of the present invention shows an exploded perspective view of the bearing force measuring machine, Figure 5 shows an enlarged longitudinal cross-sectional view of the bearing capacity measuring machine is carried out another embodiment of the apparatus of the present invention.

In addition, Figure 6 shows a longitudinal cross-sectional view of the state in which the force device in the holding capacity measuring device is operated in the bidirectional loading test pile was carried out the device of the present invention, Figure 7 is a loading test in the bidirectional loading test pile was carried out the device of the present invention Figure 8 shows a longitudinal cross-sectional view showing the state of collecting the force device in the load capacity measuring device, Figure 8 shows the collection of the force device in the pile for bidirectional loading test was carried out the device of the present invention and the inside of the load capacity measuring instrument and the recovery object withdrawal guide pipe It shows the longitudinal cross-sectional view showing the state of pouring.

According to this, the apparatus of the present invention binds several rebars 71 and 81 arranged in the transverse and longitudinal direction in a cylindrical shape, and drills the hole 10 vertically to the ground together with the tremi tubes 9 for concrete input. The upper and lower reinforcing structures 7 and 8 having different lengths that are sequentially inserted into the upper and lower portions; The upper and lower plates 111 and 112 and a cylindrical body 113, and several force devices 115 consisting of a load cell and a hydraulic cylinder, and the upper and lower reinforcing structure 7 in the hole 10 ( 8) a bearing force measuring device 11 installed between; It is installed between the bottom of the force device 115 and the lower plate 112 in the bearing force measuring device 11 and operated in response to a signal output from the control unit 15 on the ground to guide the force device 115 to withdraw the recovered object. An urging device transfer means (12) for moving to the center side of the tube (13); The chain and the fluid supply hose 14 installed in the form of communicating with the interior of the cylindrical body 113 through the upper plate of the bearing force measuring device 11 and connected to the force device 115 and the force device transfer means 12 and After performing the function of guiding the auxiliary facilities such as the electric wire, as well as measuring the tip bearing force and the main surface friction force of the concrete pile, when the force devices 115 are moved to the center by the conveying means 12 inside the cylindrical body 113. In the pile for the bi-directional load test comprising a recovery object withdrawal guide tube 13 to guide the recovery to the ground,

The support force measuring instrument 11 in which the force device 115 is embedded through the upper plate 111 of the bearing measuring instrument 11 by forming an extension portion 72 at the bottom of the rebar 71 embedded in the upper reinforcing structure 7. Protrude into the inside of, the end of the extension portion 72 of the reinforcing bar 71 to the reinforcing bar coupling piece 114a formed integrally bent to the upper surface of the auxiliary cylinder 114 of the lower plate 112 of the bearing force measuring instrument 11 It is characterized in that it is installed so as to be inserted into the punched hole (114b).

In addition, several filters through which cement particles do not pass through the upper plate 111, the lower plate 112, or the side wall of the cylindrical body 113 of the bearing force measuring device 11 in which the force device 115 is installed. (25) is further provided.

At this time, the filter 25 is characterized in that three to eight installed.

In addition, the filter 25 has a shape of square and circular and circular plate or cylinder, as well as molded with expanded polyester so as to have a 100-200㎛ pore.

In the above, the filter 25 having a rectangular, circular, and circular plate body shape can be punched in a predetermined position on the side wall of the upper plate 111, the lower plate 112, or the cylindrical body 113 of the bearing capacity measuring instrument 11. After the two water inlet holes (27a) to block the upper plate 111, the lower plate 112 or the outer side surface of the cylindrical body 113 is characterized in that the fixture is fixedly installed through the fixture (26).

In addition, the cylindrical filter 25 is inserted into and installed in the perforated pipe 28 which blocks the one end part, and the perforated pipe 28 by which several water discharge holes 282 were perforated in the periphery, and the said perforated pipe 28 3-8 holes in which the other end is drilled in the side wall of the upper plate 111, the lower plate 112, or the cylindrical body 113 of the bearing force measuring instrument 11 so that the other end is installed to protrude into the bearing force measuring instrument 11. It is characterized by welding fixed installation to each of (27b).

Referring to the operation and effect of the device of the present invention configured as described above are as follows.

First, the apparatus of the present invention, the upper and lower reinforcing structure (7) (8), which is embedded with several reinforcing bars (71) 81, bearing capacity measuring device (11), force device conveying means (12), withdrawal guide pipe In the well-known bidirectional loading test pile including (13), an extension portion 72 is formed at the bottom of the reinforcing bar 71 embedded in the upper reinforcing structure 7 to form an auxiliary cylindrical body of the lower plate 112 ( 114) The main technical component is to be inserted into the hole 114b bored in the reinforcing bar coupling piece 114a integrally bent to the upper surface.

That is, the extension unit 72 is formed at the bottom of the reinforcing bar 71 embedded in the upper reinforcing structure 7 and the tensioning device 115 through the upper plate 111 of the bearing force measuring instrument 11 as shown in FIGS. 2 and 3. Reinforcement coupling piece is to be protruded into the interior of the bearing capacity measuring instrument 11, the hole 114b for fitting the extension portion 72 of the rebar into the upper surface of the auxiliary cylindrical body 114 of the lower plate 112 The extension portion 72 of the reinforcing bar 71 protruding into the support force measuring instrument 11 through the upper plate 111 is formed by bending the integrally formed 114a to the reinforcing bar of the auxiliary cylindrical body 114 of the lower plate 112. It is to be inserted into the hole (114b) punched in the engaging piece (114a).

In this state, the load device 115 installed in the bearing force measuring device 11 is operated for the load test so that the upper and lower plates 111 and 112 are lifted and lowered by the force device 115, which is not shown. Measure the displacement of the upper side and the lower side of the bearing force measuring device 11 by using displacement measuring means, and when the expansion of the force device 115 in the bearing force measuring device 11 is completed, the bearing force measuring device using the displacement measuring means. The rebar of the upper reinforcing structure (7) protruding to the bottom of the upper plate (111) when the load test to measure the final displacement of the upper side and the lower side of (11) and to measure the tip bearing force and the main surface friction force of the concrete pile (71) As shown in FIG. 6, the extension portion 72 is maintained without being pulled out of the hole 114b drilled into the rebar engaging piece 114a of the lower plate 112 auxiliary cylinder 114.

Accordingly, after the loading test is completed, the pressing devices 115 are recovered through the recovery object withdrawal guide tube 13 as shown in FIG. 7, and concrete is introduced through the recovered object withdrawal guide tube 13 as shown in FIG. 8. Including the space between the space where the device 115 is installed and the upper and lower plates 111 and 112 formed by the expansion of the holding force measuring device 11, the concrete in the space in the recovery object extraction guide tube 13 When pouring and filling all of these spaces, the extension portion 72 and the lower plate 112 of the reinforcing bar 71 formed to protrude to the bottom from the upper plate 111 of the bearing capacity measuring instrument 11, the secondary cylinder 114 Since the rebar coupling piece 114a is integrated by the pour concrete, the upper reinforcing structure 7 and the lower reinforcing structure 8 are structurally integrated so that the pile can effectively resist the pulling force.

On the other hand, in the present invention, by installing several filters 25 on the side wall of the upper plate 111, the lower plate 112, or the cylindrical body 113 of the bearing capacity measuring instrument 11 in which the force device 115 is installed, the groundwater is different. When constructing the site-pouring pile in the excavation hole in which the cement particles around the bearing capacity measuring instrument 11 and cement particles of water are not passed, only the clean water particles are sealed through the filter 25. ) And the inside of the withdrawal guide tube 13 as another main technical component.

At this time, in the present invention, but the installation of at least three or more of the filter 25 at least eight, but not limited to this, but not limited to the size of the holding force measuring instrument 11 or in the ground where the construction of the site of the pile is made The number of installations thereof can be changed according to the amount of groundwater.

In addition, the filter 25 is molded in a foam polyester to have a rectangular, circular and circular plate body or a cylindrical shape as shown in Fig. 5, as shown in Figures 2 to 4 corresponding to the installation position, using the foam polyester When the filter 25 itself is formed into square and circular plate bodies or cylindrical shapes, the filter 25 is formed to have pores having a size of 100 to 200 μm.

In the above-described filter 25 having a rectangular and circular plate shape, as shown in Figs. 2 to 4, the upper plate 111, the lower plate 112 or the side wall outer side surface of the cylindrical body 113 of the holding force measuring device 11, It is intended to install through 26, the cylindrical filter 25 is inserted into the porous pipe 28 as shown in Figure 5 through the side wall of the upper plate 111, lower plate 112 or cylindrical body 113 ( 11) is to be installed to protrude into the interior.

That is, in the case of the filter 25 having a rectangular and circular plate-shaped shape in the above, perforation is made in a predetermined portion on the side wall of the upper plate 111, the lower plate 112, or the cylindrical body 113 of the bearing capacity measuring instrument (11). It is arranged on the outer surface to block one of the water inlet hole (27a), and fixed to the side wall of the upper plate 111, the lower plate 112 or the cylindrical body 113 through the fixture 26, the fixture The 26 may be detachably fixed through bolts or screws or may be fixed integrally by welding.

In addition, in the case of the cylindrical filter 25 in the above, 3-8 holes 27b are drilled in the side wall of the upper plate 111, the lower plate 112, or the cylindrical body 113 of the said bearing force measuring instrument 11, The cylindrical filter 25 is inserted into and installed in the perforated pipe 28 in which the disc 281 blocking one end and a plurality of water discharge holes 282 in the periphery thereof, and then the porous pipe 28 has a bearing force. The other end is installed in the form of welding fixed installation to the said hole 27b in the state which protruded in the inside of the measuring instrument 11, respectively.

Thus, several filters 25 through which only the water particles pass through the cement particles do not pass through the upper plate 111, the lower plate 112, or the side wall of the cylindrical body 113 of the bearing force measuring device 11 in which the force device 115 is installed. If you install the) when the construction site in the excavation hole is filled with ground water, only the clean ground water flows into the interior of the bearing measuring instrument 11 and the withdrawal guide pipe 13 through the filter 25 is sealed The upper and lower reinforcing structures (7) (8), which are integrally combined with the supporting force measuring device (11) and the recovery object take-out guide tube (13), which are in a closed state, can be prevented from rising by buoyancy of water. Because they can be securely seated on the bottom of the excavation hole, it is possible to smoothly proceed with the construction of the construction site.

On the other hand, in the above filter 25 is a foamed polyester using only a rectangular and circular plate or a cylindrical shape provided with pores of 100-200㎛ size, but not limited to this, but is not limited to this, to filter even fine particles Since it is not necessary, it may be formed of a non-woven fabric having fine voids, and in the case of the filter 25 inserted into the porous pipe 28, the filter 25 may be manufactured in a granular form and may be installed. (I.e., any filter may be used as long as the filter can filter cement particles).

In addition, the present invention has not been described in detail the specific configuration of the force device transfer means 12 including the force device 115 and the specific method and the method of removing the force device according to the two-way loading test, which is already known Regardless of the main technical configuration of the present invention will be apparent that the detailed description is omitted.

It should be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

1 is a configuration of a support load measuring apparatus using a conventional osterberg cell.

Figure 2 is a longitudinal cross-sectional view of the bidirectional loading test pile was carried out the device of the present invention.

Figure 3 is a longitudinal cross-sectional view of a state in which the force device is removed in the pile for bidirectional loading test carried out the device of the present invention.

Figure 4 is an exploded perspective view of a bearing capacity measuring device according to one embodiment of the present invention.

Figure 5 is an enlarged longitudinal cross-sectional view of a bearing capacity measuring device according to another embodiment of the present invention.

Figure 6 is a longitudinal cross-sectional view of a state in which the actuating device in the bearing capacity measuring device in the bidirectional loading test pile was implemented device of the present invention.

Figure 7 is a longitudinal cross-sectional view showing a state of collecting the force device in the bearing capacity tester after the load test in the bidirectional loading test pile was carried out the device of the present invention.

8 is a longitudinal cross-sectional view showing a state in which a concrete device is collected in a bidirectional loading test pile in which a device of the present invention is carried out, and concrete is placed in the inside of the bearing capacity measuring instrument and the withdrawal guide tube for collecting the recovered object.

Explanation of symbols on the main parts of the drawings

7,8: upper and lower reinforcing bar structure 9: tremi tube

10 hole 11: bearing capacity measuring instrument

12: power device transfer means 13: recovery object withdrawal guide tube

14 fluid supply hose 15 control unit

25 filter 26 fixture

27a: water inlet 27b: hole

28: porous pipe 71, 81: rebar

72: extension 111, 112: upper and lower plates

113: cylindrical body 114: auxiliary cylinder

114a: Reinforcing bar piece 114b: hole

115: force device 281: disc

282: water outlet

Claims (6)

A plurality of upper and lower reinforcing bars having different lengths which are sequentially installed in a hole excavated perpendicularly to the ground together with the concrete input trays by binding several reinforcing bars into a cylindrical shape; A support force measuring device having a plurality of force devices composed of upper and lower plates, a cylindrical body, a load cell, and a hydraulic cylinder, and installed in the form of a coupling between the upper and lower reinforcing structures in the hole; A force device transfer means installed between the bottom and the bottom plate of the force device in the support force measuring device and operated in response to a signal output from a control unit on the ground to move the force device to the center of the withdrawal guide tube; It is installed in the form of communicating with the inside of the cylindrical body through the upper plate of the bearing force measuring instrument on the ground to guide the auxiliary facilities such as fluid supply hose and wire connected to the force device and the force device transfer means, as well as the concrete pile In the bidirectional load test pile comprising a recovery object take-out guide pipe that guides the recovery of the force devices in the cylindrical body by the transport means after the end bearing force and the main surface friction force is measured. , An extension part is formed at the bottom of the reinforcing bar embedded in the upper reinforcing structure, and protrudes through the upper plate of the bearing tester into the bearing tester in which the force device is built, and the extension of the reinforcing bar is integrally formed with the auxiliary cylinder of the lower plate of the bearing tester. The upper and lower reinforcing bar structure connection and recovery withdrawal pipe prevention device of the bidirectional loading test pile, characterized in that it is installed so as to be inserted into a hole drilled in the bent reinforcing bar piece formed. The method according to claim 1, The upper and lower reinforcing bars of the bidirectional load test pile, characterized in that the filter is further installed on the side plate of the upper plate, the lower plate or the cylindrical body of the supporting force measuring device, the cement particles do not pass through only the water particles. Structural connection and recovery lead pipe injury prevention device. The method according to claim 2, The filter is connected to the upper and lower reinforcement structure of the pile for bidirectional loading test, characterized in that three to eight installed, and the withdrawal of the withdrawal pipe withdrawal. The method according to claim 2, The filter is connected to the upper and lower reinforcing structure of the pile for bi-directional loading test characterized in that the foamed polyester is formed in the shape of square and circular plate or cylinder to have a 100-200㎛ pores to prevent injury from the withdrawal pipe Device. The method according to claim 4, The rectangular and circular plate-shaped filters are arranged on the outer surface of the side plate of the upper plate, the lower plate, or the cylindrical body to block several water inflow holes perforated in a predetermined portion on the upper plate, the lower plate, or the side wall of the cylindrical body. After connecting the upper and lower reinforcing structure of the pile for bidirectional loading test, characterized in that the fixture is fixedly installed through the fixture and the withdrawal of the discharge pipe withdrawal. The method according to claim 4, The cylindrical filter may be inserted into a disc blocking one end and a perforated pipe in which several water discharge holes are drilled at the periphery thereof, and the perforated pipe may be installed to protrude into the bearing measuring device, and the other end thereof may be installed in the bearing tester. The upper and lower reinforcing bar structural connection and recovery withdrawal pipe injury prevention device of the bidirectional loading test pile, characterized in that the welding is installed in each of the 3-8 holes drilled in the upper plate or lower plate or the side wall of the cylindrical body.

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