KR101983628B1 - Pile assembly and construction method of bi-directional pile load test using the same - Google Patents

Abstract

Disclosed is a pile assembly. The pile assembly includes: a bidirectional load test device including a bidirectional load test cell unit; a pile-shaped main pile placed on the bidirectional load test cell unit, and having a hollow inside; an assisting pile placed on the main pile, and including a placement plate with a plurality of upper placement holes in the upper part of a pipe-shaped body; and an anchor structure including a plurality of lower anchor settlers fixed inside the main pile in response to each of the upper placement holes, and a plurality of anchor steel wires having the lower part fixed to each of the lower anchor settlers and having the upper part placed in each of the upper placement holes to be fixed with limited downward movement. The anchor steel wires are placed in the upper placement holes in a tense state in which tensile force is applied thereto to connect the assisting pile and the main pile, and the anchor structure enables the anchor steel wires to be separated from the lower anchor settlers in a released state in which the tensile force is released.

Description

[0001] PILE ASSEMBLY AND CONSTRUCTION METHOD OF BI-DIRECTIONAL PILE LOAD TEST USING THE SAME [0002] BACKGROUND OF THE INVENTION [0003]

The present invention relates to a pile assembly for bidirectional load testing under work site conditions and a bi-directional load test method using the same.

The load test method to confirm the quality of the file is the dynamic test and the permanent test, and the bi-directional load test is mainly applied to the drilled pile with relatively large design load.

However, when the head height of the ready-made file is lower than the file construction surface, the auxiliary file is used as an auxiliary device for transmitting the impact energy to the file below the excavation surface. As a substitute method of the file, it is necessary to carry out the bi-directional load test as a quality confirmation method.

The bi-directional load test requires the installation of a structure such as a pipe for connection between the resisting device and the measuring device on the ground surface. However, when an existing file is constructed as an alternative to the PRD piling method, concrete is finally placed in the existing file and an upper structural steel frame is inserted (disposed) on the upper side. In this case, The insertion of the steel frame is interfered with, and the subsequent trenching process may be influenced, so research for improvement thereof is needed.

The background technology of the present application is disclosed in Korean Patent Registration No. 0149397.

It is an object of the present invention to provide a pile assembly and a bi-directional load test method using the pile assembly, which can greatly reduce the interference and influence on the subsequent process after the bi-directional load test.

It should be understood, however, that the technical scope of the embodiments of the present invention is not limited to the above-described technical problems, and other technical problems may exist.

As a technical means for achieving the above technical object, a file assembly according to the first aspect of the present invention comprises: a bi-directional load test device including a bi-directional load cell unit; A file in the shape of a tube which is seated on the bi-directional load cell unit and hollow inside; An auxiliary file disposed on the file and having a seating plate having a plurality of upper seating holes formed on a tubular body; And a plurality of lower anchoring fixtures fixedly disposed inside the file corresponding to each of the plurality of upper seating holes, and a plurality of lower anchoring fixtures fixed to the plurality of lower anchor fixing bodies, And an anchor structure having a plurality of anchor steel wires fixed to the upper portion so as to be restricted in downward movement, wherein the anchor steel wire is seated in the upper seating hole in a tensioned state in which tensile force is applied, And the anchor structure may be provided such that the anchor steel wire is detachable from the lower anchor fixing member in a tension release state in which the tensile force applied to the anchor steel wire is released.

As a technical means to accomplish the above object, the bi-directional load test method according to the second aspect of the present invention comprises the steps of: (a) placing a pile assembly according to the first aspect of the present application in a formed punch; (b) injecting cement milk into the main surface of the pile to cure the pile; (c) performing a bi-directional load test using the bi-directional load testing device; And (d) separating and extracting the auxiliary port from the file using the anchor structure.

The above-described task solution is merely exemplary and should not be construed as limiting the present disclosure. In addition to the exemplary embodiments described above, there may be additional embodiments in the drawings and the detailed description of the invention.

According to the above-mentioned problem solving means of the present invention, since the file and the auxiliary file can be connected and integrated by the anchor structure, the energy of the soot acting on the auxiliary file is saved so as to be transferred to the file, (Such as a tip support layer). In addition, when the auxiliary file is pulled out, the tensile force of the anchor steel wire in tension can be removed to separate the lower anchor fixing member from the anchor steel wire. Therefore, this file and the auxiliary file can be easily separated, A part of the bi-directional load testing device can be removed together with the auxiliary file, so that the influence and interference of the bi-directional load testing device in the subsequent process after the bi-directional load test can be greatly reduced compared with the conventional one.

Figure 1 is a schematic cross-sectional view of a pile assembly according to one embodiment of the present invention disposed in the perforations.
Figure 2 is a schematic cross-sectional view of this file of a file assembly according to one embodiment of the present disclosure.
3 is a schematic cross-sectional view illustrating the top of an ancillary file in which an anchor steel wire of a file assembly according to one embodiment of the present disclosure is disposed.
4 is a schematic plan view of an auxiliary file of a file assembly according to one embodiment of the present application;
5 is a schematic cross-sectional view of a connecting portion of a file and an auxiliary file of a file assembly according to an embodiment of the present invention, wherein the illustration of a teletraid pipe is omitted.
FIG. 6 is a schematic cross-sectional view illustrating a lower anchor fixing body coupled to a lower portion of an anchor steel wire of a pile assembly according to an embodiment of the present invention.
7 is a schematic cross-sectional view of an upper portion of an ancillary file in which a teltel rod pipe of a file assembly according to one embodiment of the present disclosure is disposed.
8 is a schematic cross-sectional view of a lower portion of a pile assembly in accordance with one embodiment of the present disclosure to illustrate a bi-directional load testing device.
Figure 9 is a schematic cross-sectional view of the lower portion of an ancillary file having a guide tube to illustrate a guide tube of a pile assembly in accordance with one embodiment of the present application.
10 is a schematic cross-sectional view of a portion of an auxiliary file having an induction tube and a coupling induction unit for explaining a guide tube of a pile assembly according to an embodiment of the present invention;
11 is a schematic cross-sectional view of an auxiliary file cap of a file assembly according to one embodiment of the present application.
12 is a schematic conceptional plan view of an auxiliary file cap of a file assembly according to one embodiment of the present application.
FIG. 13 is a schematic cross-sectional view for explaining a step of disposing a pile assembly of a bi-directional load test method according to an embodiment of the present invention in a perforation.
14 is a schematic cross-sectional view for explaining that the pile assembly of the bi-directional load test method according to one embodiment of the present application is batted.
FIGS. 15 and 16 are schematic cross-sectional views for explaining puncturing of the punching equipment of the bidirectional load test method according to an embodiment of the present invention.
17 is a schematic sectional view for explaining a step of curing a cement milk of a bidirectional load test method according to an embodiment of the present invention.
18 is a schematic cross-sectional view for explaining a step of performing a bi-directional load test of the bi-directional load test method according to an embodiment of the present invention.
19 is a schematic cross-sectional view for explaining a step of performing a restrike test of the bi-directional load test method according to an embodiment of the present invention.
20 is a schematic cross-sectional view for explaining a step of extracting auxiliary files of a bi-directional load test method according to an embodiment of the present invention.
21 is a schematic cross-sectional view for explaining a step of disposing a steel structure of a bi-directional load test method according to an embodiment of the present invention.
22 is a schematic cross-sectional view for explaining the step of filling the upper side of this file of the bi-directional load test method according to one embodiment of the present application.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, the same reference numbers are used throughout the specification to refer to the same or like parts.

Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.

It will be appreciated that throughout the specification it will be understood that when a member is located on another member "top", "top", "under", "bottom" But also the case where there is another member between the two members as well as the case where they are in contact with each other.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

For the sake of reference, the terms related to directions and positions (upper, upper, upper, lower, lower, lower ends, etc.) in the description of the embodiments of the present application are set based on the arrangement state of each structure shown in the drawings. 1, for example, the 12 o'clock direction is generally on the upper side, the portion facing the 12 o'clock direction on the whole is the upper side, the end portion facing the 12 o'clock direction on the whole is the upper side, The portion facing the o'clock direction may be the lower portion, and the end portion facing the 6 o'clock direction generally may be the lower portion.

The present invention relates to a pile assembly and a bi-directional load test method using the pile assembly.

First, a file assembly according to one embodiment of the present invention (hereinafter referred to as " file assembly ") will be described.

This pile assembly is intended for bi-directional load testing under open-work conditions. Here, the term " work gap " may mean that a file is constructed using an auxiliary file when the ground level is higher than the ground bottom. In other words, the work gap can mean that the file is constructed so that the file head is formed below the earth's surface before the tear-off.

FIG. 1 is a schematic cross-sectional view of a pile assembly according to one embodiment of the present invention disposed in a perforation, and FIG. 2 is a schematic cross-sectional view of a present version of a pile assembly according to one embodiment of the present disclosure.

Referring to Figure 1, the pile assembly includes a bi-directional load testing device 8 including a bi-directional load cell unit 81. A detailed description of the bidirectional load test apparatus 8 will be given later.

Also referring to Figure 1, this file assembly includes this file (1). Referring to Figs. 1 and 2, the file 1 has a hollow tube shape. Illustratively, the file (1) may be a steel pipe file, but is not limited thereto. 2, the file 1 of this file 1 can be closed at its lower end by steel member bonding or the like. Accordingly, if necessary, a filling fluid (to be described later) can be accommodated in the present file 1. This file (1) is also placed on the bi-directional load cell unit (8). The present pile assembly can be placed in the piercings 9 and in this case the pile assembly 9 is lifted with the bi-directional load cell unit 8 and the pile 1 assembled together, .

Also, referring to Figure 1, the present file assembly includes an auxiliary file (2). The auxiliary file (2) may include a tubular body (21). Further, the auxiliary file 2 is placed and placed on the file 1. In other words, the auxiliary file 2 may be placed on the file 1 so that its interior (the interior of the body 21) is in communication with the interior of the file 1. For example, the auxiliary file 2 may be arranged so that the lower surface of the body 21 is seated on the upper surface of the file 1.

Figure 3 is a schematic cross-sectional view of an upper portion of an ancillary file in which an anchor steel wire of a file assembly according to one embodiment of the present invention is disposed, Figure 4 is a side view of an auxiliary file of a file assembly according to an embodiment of the present invention, 5 is a schematic cross-sectional view showing a connecting portion of a file and an auxiliary file of a file assembly according to an embodiment of the present invention, the illustration of which is not shown;

Referring to FIGS. 1, 3 and 4, in the auxiliary file 2, a seating plate 22 having a plurality of upper seating holes 221 is provided on the tubular body 21. Referring to FIG. 4, the seating plate 22 may be in the shape of a closed figure in which a hollow portion is formed. The upper seating hole 221 may be formed in a portion (region) surrounding the hollow portion of the seating plate 22 and a plurality of the seating holes may be formed in the circumferential direction of the seating plate 22. In addition, the upper seating holes 221 may be formed so that one or more (e.g., two) upper and lower seating holes 221 are spaced apart from each other. By way of example, the seating plate 22 may be connected to the upper end of the body 21 by a conventional bonding method such as welding.

1, the present pile assembly includes an anchor structure 3. Referring to FIGS. 1 and 2 together, the anchor structure 3 includes a plurality of lower anchor fixing bodies 31 fixedly disposed inside the present pile 1 corresponding to each of the plurality of upper seating holes 221 do. For example, referring to FIG. 1, a plurality of lower anchor fixing members 31 may be fixedly disposed on the inner surface of the file 1 at intervals along the circumference thereof. Each of the plurality of lower anchor fixing bodies 31 may be disposed in a one-to-one correspondence with each of the plurality of upper seating holes 221. 4, when a plurality of upper seating holes 221 are formed, 16 lower anchor fixing bodies 31 are arranged along the circumferential direction so as to correspond to each of the 16 upper seating holes 221 . Here, the one-to-one correspondence may be referred to as being disposed or formed at the same (corresponding) position (angle) with respect to the circumferential direction (circumferential direction). In addition, the lower anchor fixing member 31 may be provided in a one-to-one correspondence with the anchor steel wire 32. Referring to FIG. 4, as described above, considering that two or more upper seating holes 221 are formed as a group (pair) adjacent to each other and each group is disposed at intervals along the circumferential direction, The anchor fixing member 31 may also be grouped into two or more groups corresponding to the groups of the upper seating holes 221 and spaced apart from each other along the circumferential direction (see FIG. 2).

1, the anchor structure 3 includes a plurality of anchor steel wires 32 mentioned above. Referring to FIGS. 1 and 5, a plurality of anchor steel wires 32 are fixedly fixed to a plurality of lower anchor fixing bodies 31, respectively. Referring to FIGS. 1 and 3, a plurality of upper seating holes 221 Respectively, so that the downward movement is limited.

Referring to FIG. 1, the anchor steel wire 32 is seated in the upper seating hole 221 in a tension state in which tensile force is applied, so that the auxiliary file 2 and the present file 1 are interconnected. A tensile force may be applied to the anchor steel wire 32 in the tensioned state to maintain the auxiliary file 2 in a fixedly placed state on the present file 1. [ For example, the tension of the anchor steel wire 32 can be determined by lifting the file 1 and the auxiliary file 2 in an interconnected state and by placing them in the perforation 9 so that the tensile force on the anchor steel wire 32 is artificially It can be maintained until it is released.

According to this file assembly, since the file 1 and the auxiliary file 2 placed on the file 1 can be integrated by the anchor steel wire 32, An external force (striking energy) acting on the auxiliary file 2 can be transmitted to the present file 2. [ Generally, there is a case where the present file (the present term) is disposed below the excavation surface as in the case of the work construction. According to this file assembly, the file 1 and the auxiliary Since the file 2 can be placed in the perforation 9, the striking energy can be transmitted to the file 1 disposed below the excavation surface through the staple of the auxiliary file 2. Thus, the present file assembly integrates the file 1 and the auxiliary file 2, inserts the file 1 into the perforation 9, and passes the file 1 through the putter process using the hammer to the planned stratum (for example, Support layer).

3, the anchor structure 3 may include an upper wedge set 33 that grips an upper periphery of the anchor steel wire 32 and has a shape that becomes narrower as the outer periphery thereof goes downward . The upper seating hole 221 may have a tapered section 2211 corresponding to the shape of the outer circumferential surface of the upper annular tooth set 33 and having a narrower width from the upper end toward the lower end. That is, at least part of the section in the up-and-down direction of the upper seating hole 221 may be the taper section 2211. Thus, the upper unchannel set 33 is seated in the upper seating hole 221 so that the movement of the upper unicorn set 33 in the downward direction is restricted, and the upper unchannel set 33 can be freely moved in the upward direction. The anchor steel wire 32 surrounded by the plurality of tongues included in the upper tongue piece set 33 is located on the lower side in the upper seating hole 221 in a state in which the upper tongue set 33 is seated in the upper seating hole 221, The downward movement can be limited. 3, the upper seating hole 221 is shown as including a section 2212 other than the taper section 2211 and the taper section 2211. [

The anchor structure 3 is provided such that the anchor steel wire 32 is detachable from the lower anchor fixing body 31 in the tension release state in which the tensile force applied to the anchor steel wire 32 is released. Illustratively, as the anchor steel wire 32 is contracted downward by a predetermined length while the upper unchannel set 33 is separated (removed) from the anchor steel wire 32 and the upper seating hole 221, Can be reached.

FIG. 6 is a schematic cross-sectional view illustrating a lower anchor fixing body coupled to a lower portion of an anchor steel wire of a pile assembly according to an embodiment of the present invention.

6, the lower anchor fixing body 31 includes a lower earthenware set 311 holding the lower periphery of the anchor steel wire 32 and having a shape that becomes narrower toward the upper side, and a lower earthenware set 311 having an outer peripheral surface of the lower earthenware set 311 And a fixing unit 312 having a lower seating hole 3121 having a tapered section whose width becomes narrower in accordance with the shape. The lower seating hole 3121 can be formed so that a wedge effect can be exerted through a tapered section that covers at least a part of an oblique wedge surface (outer circumferential surface) of the lower outer sheath set 311.

When the upper end of the anchor steel wire 32 is rotated in the untensioned state, the portion of the lower anchor fixing member 31 frictionally connected to the lower end of the anchor steel wire 32 by the fitting engagement is screwed and moved downward The lower unthickness set 311 may be spaced apart from the lower seating hole 3121 downward.

Specifically, the lower anchor fixing body 31 is connected to the lower portion of the lower earset 311 so as to be interlocked with the movement of the lower earset 311 in the up and down direction, while the lower earset 311 is not moved in the horizontal direction, A male threaded portion 3131 is connected to the lower portion of the outer mouth joint unit 313 and the fixing unit 312 protruding downward and has a groove or a hole in the form of a female threaded portion 314 formed in a downwardly depressed manner with the male threaded portion 3131 .

The tongue interlocking unit 313 is configured such that the lower tongue tooth set 311 presses the inner peripheral surface of the lower seating hole 3121 by a tensile force applied to the anchor steel wire 32, As shown in FIG.

The upper end of the outer linkage unit 313 is formed with a downwardly slidable downwardly slidable steel wire fitting groove 3132 so that the lower end of the anchor steel wire 32 can be engaged. A rotating friction force is applied to rotate the male threaded portion 3131 of the outer sheath interlocking unit 313 through the rotation of the anchor steel wire 32 so that the male threaded portion 3131 can be screwed to the female threaded portion 314 May be formed between the lower end of the anchor steel wire (32) and the steel wire fitting groove (3132). When the anchor steel wire 32 is pulled upward by a predetermined force or more in a state where the male threaded portion 3131 and the female threaded portion 314 are screwed together, the lower end of the anchor steel wire 32 is engaged with the steel wire- So that it can be displaced upward from the base 3132.

According to this, when the tensile force acting on the anchor steel wire 32 is released, the anchor steel wire 32 can be repelled downward by a reaction force equal in magnitude to the tensile force (tensile force). The anchor steel wire 32 is repelled and the male screw portion 3131 of the buckle interlocking unit 313 can be inserted into the female screw portion 314. In this state, The male threaded portion 3131 and the female threaded portion 314 of the female joint unit 313 can be screwed to each other and the male threaded portion 313 and the female threaded portion 314 can be engaged with each other, The anchor steel wire 32 can be removed from the tongue interlocking unit 313 when the anchor steel wire 32 is pulled upward by the predetermined force or more.

As another example of the engagement between the anchor steel wire 32 and the lower eccentric tooth set 311, the lower eccentric tooth set 311 has at least a part of the upper portion thereof engaged with the anchor steel wire 32, And can be inserted into the lower seating hole 3121 and pressed. In this case, when the tensile force of the anchor steel wire 32 is released, the anchor steel wire 32 can be repelled downward by a reaction force having a magnitude equivalent to the tensile force (tension), and the anchor steel wire 32 is repelled The male threaded portion 3131 of the male and female coupling unit 313 can be inserted into the female threaded portion 314 and the anchor steel wire 32 can be inserted into the male threaded portion 3131 and the female threaded portion 314 The male screw portion 313 and the female screw portion 314 of the male and female tongue interlocking unit 313 can be screwed to each other and the male screw portion 313 and the female screw portion 314 can be engaged with each other as the rotation of the anchor steel wire 32 progresses. And the lower tongue piece set 311 connected to the tongue interlocking unit 313 and the tongue interlocking unit 313 can be moved downward. As a result, the gripping force for gripping the anchor steel wire 32 of the lower eyelet set 311 can be weakened when the lower eyeletchleet set 311 starts to be removed from the lower seatholding hole 3121 which has pressed it, The external force pulling the upper end 32 in the upward direction becomes stronger than the gripping force and the anchor steel wire 32 can be pulled out. In this case, the lower outer bracket set 311 may be provided with a bushing ring for exerting an external force in the outward direction on the inner side of the lower bracket 311, and the amount of screwing of the male screw portion 313 and the female screw portion 314 The pressing force on the lower earthenware set 311 by the lower seating hole 3121 is lowered by the pressing force of the lower earthenware set 311 when the lower earthenware set 311 connected to the bucky interlocking unit 313 and the buckle interlocking unit 313 is moved in the downward direction The anchor steel wire 32 can be pulled out more quickly and easily by opening the inner portion holding the anchor steel wire 32 of the lower outer sheath set 311 in response to the pressing force that weakens the opening ring have.

For reference, when the portion of the anchor steel wire 32 protruding upward from the seating plate 22 is rotated, the anchor steel wire 32 itself can be rotated. Therefore, when the lower portion of the anchor steel wire 32 and the lower anchor fixing body 31 are separated from each other, the operator inserts the anchor steel wire 32 from the ground (for example, on the seating plate 22) The lower part of the anchor steel wire 32 and the lower anchor fixing body 31 can be easily separated by pulling the anchor steel wire 32 after rotating the part 314 in the screwing direction.

The releasing of the tensile force applied to the anchor steel wire 32 (releasing the tension state) is performed by pressing the upper and lower earthed tooth sets 33 which are seated in the upper seating hole 221 in a state of gripping and gripping the periphery of the anchor steel wire 32 The anchor steel wire 32 can be pulled further downwardly from the seating plate 22 as it is separated from the anchor steel wire 32 and the upper seating hole 221.

FIG. 7 is a schematic cross-sectional view of an upper portion of an auxiliary file in which a teltel rod pipe of a file assembly according to one embodiment of the present disclosure is disposed, and FIG. 8 is a schematic cross-sectional view of a lower portion of a file assembly according to an embodiment of the present disclosure. For reference, FIG. 8 shows a cross-sectional view of some components for easy understanding of the bi-directional load test device.

1 and 8, the bi-directional load cell unit 81 includes a downward plate 812, a pressurizing device (pressurizing cell) 813 disposed on the downward plate 812, And an upward plate 811 disposed on the apparatus. By applying a load to each of the downward plate 812 and the upward plate 811 by the pressurizing device 813, the bi-directional load test is carried out and the characteristics such as the tip end supporting force and the main surface frictional force of the formed file can be grasped have. Such a bidirectional load test is obvious to those skilled in the art, so a detailed description thereof will be omitted. The number of pressurizing devices 813 may be determined according to the conditions of construction (for example, the pile diameter).

1 and 8 together, the bi-directional load test device 8 is mounted in the inside of the file 1 viewed from the bi-directional load cell unit 91, inside the body 21 of the auxiliary file 2, (Telltale Rod Pipe) 82 extending upwardly to pass through the through-hole formed in the plate 22. As shown in FIG.

7 and 8 together, the bidirectional load test apparatus 8 is connected to the bidirectional load cell unit 81 at the lower end so as to be able to measure the bi-directional load test displacement, And a Telltale rod 83 extending upwardly from the seating plate 22 through the support plate 22.

8, a portion (for example, two) of the teltel rod pipes 82 may be connected to a bidirectional load cell unit 81 And the remaining portions (e.g., two) of the teletyil rod pipes 81 may be connected to the upward plate 812 of the bi-directional load cell unit 81 have. The teletail rod 83 may be disposed in each of the teletail rod pipes 82. The teletail rod 83 may be disposed inside the teletail rod pipe 82 in accordance with the connection relationship between the teletard rod pipe 82 and the bidirectional load cell unit 81 (For example, two) of the teletail rods 83 are connected to the downward plate 812 of the bi-directional load cell unit 81 to measure the displacement during the bidirectional loading test, (For example, two) of the bi-directional load cell unit 81 are connected to the up-plate 811 of the bi-directional load cell unit 81 to measure the displacement in the bi-directional load test.

8, the teltel rod pipe 82 may include a lower load pipe 822 connected to the bi-directional load cell unit 81. [ 7 and 8, the telescopic rod pipe 82 includes a lower rod pipe 822 having a lower end inserted into an upper opening of the lower rod pipe 822 and an upper rod pipe 821 ). Thus, the lower rod pipe 933 and the upper rod pipe 821 can be fastened in such a manner that the upper rod pipe 821 is inserted into the lower rod pipe 822.

8, the teletail rod pipe 82 may include a foreign matter insertion preventing unit 823 which is provided to close between the periphery of the upper end opening and the lower rod pipe 822. Illustratively, the foreign matter insertion preventing unit 823 may be made of a material including rubber. However, the material constituting the foreign matter inserting prevention unit 823 is not limited to this, and may include various materials.

1, the lower load pipe 933 and the upper load pipe 821 are connected to each other by a fastening unit 823 such as a coupler, and the lower load pipe 822 and the upper load pipe 821, As shown in Fig.

The upper rod pipe 821 may be detachably installed upward from the lower rod pipe 822. Thus, the upper load pipe 821 can be removed together when the auxiliary file 2 is pulled out.

According to the above description, the bidirectional load test can be installed in the perforation 9 together with the file 1 and the auxiliary file 2 by the bidirectional load testing device 8, and when the auxiliary file 2 is removed, A part of the test apparatus 8 (such as the upper rod pipe 821, etc.) can be removed together with the auxiliary file 2. Thus, according to the present pile assembly, bi-directional load test can be easily performed even when the head height of the pile is lower than the ground surface as in the case of the artificial pavement construction. In addition, since a part of the bi-directional load test device 8 is removed together with the auxiliary file 2 after the bi-directional load test, the influence on the subsequent process after the bi-directional load test by the bidirectional load test device 8, The subsequent process after the bi-directional load test can be easily performed.

FIG. 9 is a schematic cross-sectional view of a lower portion of an auxiliary file having a guide tube to illustrate a guide tube of a file assembly according to one embodiment of the present application, and FIG. 10 is a cross- Sectional view of a portion where an induction pipe and a connection induction unit of an auxiliary file are provided for explanation.

1 and 8 to 10, the present pile assembly includes a guide tube 29 provided on the inner surface of the body 21 of the ancillary file 2 for guiding the extension of the teletail rod pipe 82 . By this guide tube 29, the teletail rod pipe 82 passes through the guide tube 29 and passes through the ancillary file 2 and extends in the extending direction and the extended position to the upper side of the seating plate 22, .

1, 5 and 8 to 10, the auxiliary file 2 is guided from the inner peripheral surface of the body 21 to the body 21 And a connection inducing unit 25 protruding to the lower side of the connecting guide unit 25. The plurality of connection induction units 25 may be arranged in a spaced relation along the circumferential direction. The auxiliary file 2 is arranged on the file 1 so that the connection inducing unit 2 is led into the file 1 so that the lower surface of the auxiliary file 2 contacts the upper surface of the file 1 Can be guided. That is, the connection inducing unit 2 can guide the seating of the auxiliary file 2 to the file 1. Consistency between the file 1 and the auxiliary file 2 can be improved by the connection inducing unit 25 and the energy of the soot acting on the auxiliary file 2 can be maximally preserved, .

9, the outer side surface of the lower end of the connection inducing unit 25 (the outer side surface in the radial direction of the auxiliary pile 2) has an inclined surface 251 inclined toward the inside of the auxiliary pile 2 toward the lower side, As shown in FIG. Thus, the connection inducing unit 2 can guide the auxiliary file 2 more naturally and progressively in the process of arranging the auxiliary file 2 on the file 1. [

1, the auxiliary file 2 may include an opening 23. The opening 23 may be formed on the upper side of the seating plate 22 spaced upward from the upper portion of the anchor steel wire 32 seated in the upper seating hole 221. For example, a tubular auxiliary body including the above-described opening 23 with the seating plate 22 interposed therebetween can be provided on the upper side of the seating plate 22 so as to correspond to the body 21. The auxiliary body may be provided so as to surround a portion protruding upward from the upper seating hole 221 of the anchor steel wire 32.

FIG. 11 is a schematic cross-sectional view of an auxiliary file cap of a file assembly according to one embodiment of the present application, and FIG. 12 is a schematic plan view of an auxiliary file cap of a file assembly according to one embodiment of the present application.

Referring to Figures 11, 12 and 14, the file assembly may include an auxiliary file cap 4 covering the opening 23 of the ancillary file 2. Accordingly, the light for the auxiliary file 2 can be made through the play for the auxiliary file cap 4. With this auxiliary file cap 4, it is possible to eliminate the difficulty of the security for the auxiliary file 2 due to the provision of the anchor steel wire 32 connecting the file 1 and the auxiliary file 2.

Referring to Figs. 11 and 14, the auxiliary file cap 4 may include a lower cap portion 44 surrounding the top of the auxiliary file 2. The lower cap portion 44 may wrap the upper surface of the auxiliary pile 2 and the opening 23. In addition, the auxiliary file cap 4 may include an upper cap portion 43 provided on the upper side of the lower cap portion 44. The upper cap portion 43 may be disposed to protrude upward from the upper surface of the lower cap portion 44. The upper cap portion 43 may be provided so as to protrude upward from a portion of the upper surface of the lower cap portion 44 other than a rim portion of the upper surface of the lower cap portion 44 (an outwardly facing portion). The light energy to be applied to the auxiliary cap 2 can be transmitted to the auxiliary cap 2 via the lower cap portion 44. [

11 and 12, the upper cap part 43 may be provided with a girder 41 protruded from the outer surface of the upper cap part 43 and supported on the rim of the upper surface of the lower cap part 44 . Referring to Fig. 12, the girders 41 may be provided at intervals along the circumferential direction of the upper cap portion 43 (the circumferential direction of the auxiliary pile cap 4). The upper cap portion 43 is provided with the girder 41 so that an external force acting on the upper cap portion 43 by the putter is applied to the upper cap portion 43 and / It can be maximally stored through the girder 41 and can be uniformly applied to the lower cap portion 44 and the auxiliary file 2. [

11 and 12, a hole 42 for communicating the inside and the outside of the upper cap part 43 may be formed on the outer surface of the upper cap part 43. As shown in FIG. A plurality of holes 42 may be formed at intervals along the periphery of the upper cap portion 43. For example, referring to FIG. 12, four holes 42 may be formed at intervals. The hole 42 is formed in a manner to expose the upper portion of the anchor steel wire 32 from the lower portion to the upper side of the upper seating hole 221 of the anchor steel wire 32 Hole. The spare portion may refer to a portion of the upper cap portion 43 which is exposed to the upper side of the upper seating hole 221 of the anchor steel wire 32 out of an acceptable range. According to the present pile assembly, when a portion of the anchor steel wire 32 that is difficult to accommodate in the auxiliary file cap 4 is generated, the excess portion is exposed to the outside of the upper cap portion 43 through the hole 42 without being cut off. . Even if the anchor steel wire 32 protrudes too shortly on the seating plate 22, there is a possibility that the anchor steel wire 32 may be somewhat inconvenient when the anchor steel wire 32 is tensioned or later disassembled. Is projected onto the seating plate 22 is preferably set in consideration of the ease of operation during tensioning and disassembly of the steel wire. Further, in consideration of the convenience of such work, when the anchor steel wire 32 is not cut and a spare portion having a predetermined length or more is placed, the reuse side of the anchor steel wire 32 may be more advantageous.

11, an upper portion of the lower cap portion 44 is provided with an opening formed in the upper cap portion 43 so that the excess portion of the anchor steel wire 32 extends to the upper cap portion 43 and is exposed to the outside through the hole 42. [ An inner hole communicating with the inner space of the upper cap portion 43 can be formed. Referring to Fig. 11, the girder 41 can be connected to and supported by the peripheral portion of the upper member of the lower cap portion 44 (the peripheral portion corresponding to the outer side of the upper cap portion 43) And the inner hole may be formed on the inner side of the peripheral support member (inside the upper cap portion 43). 19, the excess portion of the anchor steel wire 32 extends through the inner hole toward the upper cap portion 43, and a portion of the excess portion, which can not be accommodated in the upper cap portion 43, And the holes 42 are formed in the outer circumferential surface of the outer circumferential surface.

According to the above description, the pile assembly can be applied when installing a file below the excavation surface, and may include an auxiliary device for delivering the striking energy to the file disposed below the excavation surface.

It is necessary to integrate the auxiliary file (auxiliary port) with this file (this paragraph) in order to play the established file below the excavation surface (this file (this paragraph)). However, since the conventional method of using the auxiliary file results in a separation interval between the present file and the auxiliary file, transmission of the batting energy is uncertain and the reliability of the dynamic test analysis result is affected by the difference in shape and physical characteristics (impedance) And when the depth of drilling is very deep, there is a problem that quality control is not easy due to lack of workability. Accordingly, in order to solve the above problems, the shape and physical characteristics of the present file and the auxiliary file are united and integrated, and an appropriate level of tensile force is developed to increase the reliability of the workability and the load test result. A method for easily separating this file from the auxiliary file is needed.

The present file assembly connects the file 1 and the auxiliary file 2 with the anchor structure 3 as a removal anchor to exert a sufficient tensile force to integrate the file 1 and the auxiliary file 2, (9), and the file can be put on the planned height (such as the leading end supporting layer) through the putter process. According to the present pile assembly, when the auxiliary file 2 is pulled out, the tensile force of the anchor steel wire 32 which was in a tension state is removed, so that the lower portion of the anchor steel wire 32 and the lower anchor fixing member 31 are separated It is possible to easily separate the file 1 and the auxiliary file 2 and extract the auxiliary file 2.

Hereinafter, a bi-directional load test method according to one embodiment of the present invention using the present pile assembly (hereinafter referred to as " bi-directional load test method ") will be described. However, the same reference numerals are used for the same or similar components as those described in the above-described pile file assembly with respect to the description of the bi-directional load test method, and redundant descriptions will be simplified or omitted.

This bi-directional load test method is applied to the construction conditions of the work.

FIG. 13 is a schematic cross-sectional view for explaining a step of disposing a pile assembly of a bi-directional load test method according to an embodiment of the present invention, and FIG. 14 is a cross- 15 and 16 are schematic cross-sectional views for explaining the drilling of the punching equipment of the bidirectional load test method according to one embodiment of the present application.

Referring to FIG. 13, the bi-directional load test method includes a step (hereinafter referred to as a 'first step') of disposing the present pile assembly described above in the formed punch 9. The first step can be placed in the perforation 9 by lifting the pile assembly. 14, the first step is to place the file 1 on the planned stratum (such as the leading stratum) by striking the pile assembly disposed within the perforation 9. The light for this file assembly can be made by putting the accessory cap 94 on the auxiliary file cap 4 so that the energy of the soot acting on the auxiliary file 2 is transferred to the file 1, So that the file 1 can be placed on the planned stratum.

Also, for reference, the perforation 9 may be formed before the first step, and the first step may be performed on the perforated 9 formed. 15 and 16, the perforation 9 can be formed by setting the casing 91 on the paper surface, and perforating equipment (such as a screw) 92 by performing perforation have.

17 is a schematic sectional view for explaining a step of curing a cement milk of a bidirectional load test method according to an embodiment of the present invention.

Referring to FIG. 17, the bi-directional load test method may include a step (hereinafter referred to as a 'second step') in which the cement milk 97 is cured by curing the main surface of the pile 1. First, the second step is to inject cement milk 97 on the main surface of the present file (1), that is, between the main file 1 and the perforation 9. Cement milk (97) is formed through mixing of cement and water, and can be understood as a broad concept including cement paste, cement grout, cement paste and the like.

Also, the second step is to cure the injected cement milk 97. 17, the second step is to install a heater 952 inside the hollow part so as to come into contact with the filling fluid (not shown in the drawing) filled in the present file 1 and to transfer the filling fluid from the filling fluid to the cement milk 97 The cushion milk 97 can be cured at a higher rate than the room temperature curing by heating the filling fluid through heat generation of the heater 952 so that heat is transferred.

For example, in a second step, the filling fluid may be filled in the file 1 and a heater 952 may be disposed. As described above, since the lower end of the file 1 is closed, the filling fluid can be filled in the file 1. [ The heater 952 can also be inserted into the file 1 through the connection line 951. Further, the heater 952 may be connected to an electric wire extending from the ground to supply electricity.

The second step is to control the heater 952 so that the heat of the heater 952 is transmitted through the filling fluid to the cement milk 97 which is placed outside the pile 1 of the pile 9 have. The heater 952 can heat the filling fluid so that the cement milk 97 cures to a strength not less than the required strength within a predetermined time.

Illustratively, the fill fluid may comprise one or more of a gas and a liquid. For example, the filling fluid may be, but is not limited to, a liquid such as water. As another example, the filling fluid may be air. However, in the case of using air as a filling fluid, considering that the heat capacity of a gas such as air is relatively small as compared with a liquid such as water, the number of heaters and the amount of heat generated are greatly increased desirable.

Preferably, the filling fluid may comprise a liquid. The liquid contained in the filling fluid is preferably a liquid having a specific heat and density higher than that of air. Generally, in the case of air, the density or the specific heat is not so large as compared with the water, so that heat can be transferred to the outside of the pile through the predetermined thickness of the pile made of concrete or steel. (952) must be heated to a higher temperature. On the other hand, a filling fluid containing a liquid such as water has a larger heat capacity (density and specific heat) than that of air, so that the heat of the filling fluid can be efficiently transferred to the outside of the pile 1. [

In addition, the filling fluid comprising the liquid can be heated to a relatively uniform temperature while a high specific heat is combined with the circulation of the liquid, so that more uniform heat transfer to the outside of the pile (1) can be achieved. In other words, in the case of the filling fluid containing liquid, since the specific heat is high and it circulates slowly (without dripping of temperature), it is easy to maintain a uniform temperature compared to the gas.

Further, the filling fluid can be realized in a form in which a liquid is a main component and some other substance is added. At this time, as a substance added to the filling fluid, additives for performing various functions such as rapid circulation of the filling fluid, prevention of decrease in strength of the pile (1), and heat capacity increase can be utilized. For example, metal powder, metal pieces or granules with high specific heat and density may be added to the filling fluid.

However, the filling fluid is not limited thereto, and various fluids (liquid or gas) capable of achieving good heat transfer through the thickness of the pile 1 can be selected as the filling fluid. Also, it is preferable that the selection of the fluid suitable for the filling fluid is performed by taking into consideration also the heat generating means such as the number and the output of the heaters 952.

In addition, the filling fluid can be pre-heated before being injected into the pile 1. [ Generally, a heater 952 is installed after the filling fluid is charged into the file 1, but the present invention is not limited thereto. As another example, the heater 952 may be first installed in the main pipe 1, and then the filling fluid may be injected.

Further, the heater 952 can heat the filling fluid. Illustratively, the heater 952 may be provided in an electrically heated manner. However, the method of the heater 952 is not limited thereto, and devices having various heating methods can be utilized as the heater 952. 15, the heater 952 may have a shape elongated along the drilling depth direction so as to more uniformly heat the filling fluid.

Referring to FIG. 17, a plurality of heaters 952 may be disposed in the file 1 at intervals along the longitudinal direction (vertical direction). Since the plurality of heaters 952 are spaced apart as described above, the temperature of the filling fluid can be more uniformly maintained, and consequently, the concrete can be more uniformly cured, so that even strength or surface friction can be ensured.

An internal temperature sensor may also be provided to contact the filling fluid. The operation of the heater 952 can be controlled based on the temperature of the filling fluid sensed by the internal temperature sensor.

In addition, one or more main surface temperature sensors may be installed on the main surface portion between the perforation 9 and the main file 1. The internal surface temperature sensor senses the temperature of the cement milk 97 itself, while the internal temperature sensor senses the temperature of the filling fluid, which is the heat transfer medium that transfers heat to the cement milk 97 .

17, the lowermost heater 952 of the plurality of heaters 952 may be disposed within a predetermined height from the bottom surface of the perforation 9 (the bottom surface of the file 1). The predetermined height may be a height at which heating to a predetermined filling fluid temperature range can be performed with respect to the filling fluid which is adjacent to the bottom surface of the perforation 9 among the filling fluids filled in the file 1.

When the heater 952 heats the surrounding filling fluid, convection of the upwardly moving fluid occurs as the heated filling fluid becomes smaller in density. Thus, when the lowermost heater 952 is disposed so as to be spaced apart from the bottom surface of the perforation 9 by a predetermined distance or more, the temperature of the filling fluid in the vicinity of the bottom surface of the perforator 9 is not uniformized by convection There is a limit. In this case, heat is not transmitted to the concrete adjacent to the bottom surface of the perforation 9, so that the curing speed is slower than the concrete located at the upper portion of the perforation 9, May not be uniformly cured (hardened) relative to concrete in other areas. Accordingly, the inventor of the present invention recognized the necessity of setting the position of the lowermost heater 952 to be more detailed. Considering the convection during heating of the fluid, it is preferable that the lowermost heater 952 be placed as close as possible to the bottom surface of the perforation 9 or in contact with the bottom surface of the punch 9, It is possible to prevent damage to the undersurface of the file 1 while preventing damage to the bottom surface of the file 1 caused by the temperature of the filling fluid 1 It is preferable to set the arrangement position of the lowermost heater 952 so that heating of the lowermost heater 952 can be performed.

Further, the heater 952 may generate heat such that the filling fluid is heated to a temperature within a predetermined filling fluid temperature range. Illustratively, the control unit 95 can control the heating (operation) of the heater 952 based on the temperature of the filling fluid sensed through the internal temperature sensor. That is, the temperature of the filling fluid can be adjusted through the combination of the controller 95 and the internal temperature sensor.

For reference, the control unit 95 is preferably understood as a concept including a portion for controlling the heater 952, a portion for controlling the internal temperature sensor, a portion for controlling the main surface temperature sensor, and the like. For example, the control unit 95 may be integrally provided as shown in the figure, but may be separately provided so that each control unit is physically separated.

Further, the preset filling fluid temperature range may be a temperature range having a lower limit higher than room temperature. In this construction method, the filling fluid is heated to a high temperature by using the heater 952 so that high-temperature heat is transferred to the cement milk 97 placed outside the pouch 1, and consequently, the cement milk 97 By allowing the cement milk 97 to cure at a high temperature exceeding room temperature, it is possible to cause the cement milk 97 to reach the desired strength at a much higher rate than the curing at room temperature or below room temperature.

That is, the predetermined filling fluid temperature range may be a temperature range that allows the heat transfer to be performed so that the time required for the cement milk 97 to reach the desired strength is shorter than the time required to reach the desired strength at room temperature . In other words, the predetermined fill fluid temperature range can be set to a temperature range that can perform heat transfer to the cement milk 97 to such an extent that the cement milk 97 can be maintained at a higher temperature than room temperature and fast cured .

More specifically, since the heater 952 directly heats the filling fluid, and the cement milk 97 is heated as heat is transferred from the directly heated filling fluid to the cement milk 97, the filling fluid is significantly The cement milk 97 may be heated to a temperature higher than room temperature. That is, since the temperature of the cement milk 97 heated by receiving the heat from the filling fluid is lower than the temperature at which the filling fluid is actually heated by the heater 952, the filling fluid is supplied to the cement milk 97 at a predetermined time It is preferable to heat to a temperature sufficiently higher than room temperature, which is high enough to allow high-temperature curing at a high speed within a predetermined period of time considering air in the site.

The preset filling fluid temperature range also influences the heat transfer from the filled fluid to the cement milk 97 outside the pile 1, such as the thickness of the formed pile 1 formed, the coverage per pile 1, Considering the factors, it is desirable to customize each site. It is preferable that the predetermined filling fluid temperature range is set to a temperature range that does not affect the strength of the pile 1 in which the filling fluid is directly in contact and the like, The specification of the file and the material of the file (1).

For reference, the cement milk 97 temperature sensor may be provided in a vertical tube having a predetermined diameter so that a plurality of the temperature sensors are arranged at intervals in the vertical direction. At this time, the vertical pipe may be provided with a hole having a plurality of holes formed in the circumference thereof so that the temperature sensor of the cement milk 97 disposed therein may measure the temperature of the cement milk 97 being cured more directly and accurately. The controller 95 controls the temperature of the filling fluid detected by the fluid temperature sensor and the temperature of the cement milk 97 sensed by the cement milk 97 temperature sensor as described above, It is possible to control the heat generation of the heater 952 so as to be heated to a temperature of < RTI ID = 0.0 >

FIG. 18 is a schematic cross-sectional view for explaining a step of performing a bi-directional load test of the bidirectional load test method according to an embodiment of the present invention, and FIG. 19 is a view illustrating a restrike test of the bidirectional load test method according to an embodiment of the present invention Fig. 2 is a schematic cross-sectional view for explaining the step of FIG.

Referring to FIG. 18, the present bi-directional load test method includes a step of performing a bi-directional load test using a bi-directional load test device 8 (hereinafter referred to as a 'third step'). In a third step, the pressurizing device 813 can apply a load to the downward plate 812 and the upward plate 811, respectively. By performing the bi-directional load test in this way, the characteristics of the end bearing force and the main surface friction force of the pile formed can be grasped. Such a bidirectional load test is obvious to those skilled in the art, so a detailed description thereof will be omitted.

Referring to FIG. 19, the bi-directional load test method may include a step of performing a restrike test. The step of performing the restricting test may be performed between the second step and the third step.

FIG. 20 is a schematic cross-sectional view for explaining a step of extracting an auxiliary file of a bidirectional load test method according to an embodiment of the present invention, and FIG. 21 is a schematic view illustrating a step of arranging a steel structure of a bidirectional load test method according to an embodiment of the present invention And FIG. 22 is a schematic cross-sectional view for explaining a step of filling the upper side of this file of the bi-directional load test method according to one embodiment of the present application.

20, the present bi-directional load test method includes a step (hereinafter referred to as a fourth step) of separating and extracting the auxiliary file 2 from the present file 1 by using the anchor structure 3 . In the fourth step, after releasing the tensile force acting on the anchor steel wire 32, the anchor steel wire 32 can be disconnected from the anchor steel wire 32 and the lower anchor fixing member 31 by rotating the anchor steel wire 32. Since this has been described above, a detailed description will be omitted. The connection between the lower portion of the anchor steel wire 32 and the lower anchor fixing body 31 is released so that the file 1 and the auxiliary file 2 can be separated from each other and then the auxiliary file 2 is pulled out .

In the fourth step, the upper rod pipe 821 of the bidirectional load test apparatus 8 can be separated (pulled) from the lower rod pipe 822. In addition, the fourth step may remove at least a part of the teltel rod 83. Accordingly, after the fourth step is performed, the bi-directional load cell unit 81, the lower rod pipe 822, and the like can be left in the ground.

Referring to FIG. 21, the bi-directional load test method may include inserting the file (1) and disposing the steel structure 96 on the file (1). Illustratively, the interior of the file 1 may be laid with concrete. Here, the shape of the steel structure 96 is not limited to that shown in the drawings, and may be applied to various types of steel structures 96 known to those skilled in the art or expected to be developed in the future.

22, the present bi-directional load test method may include the step of removing the casing 91 and filling the upper side of the present file 1. [ Specifically, soil filling can be performed on the upper portion of the present pile 1 of the perforation 9.

This file construction method using this file assembly can be applied to P.R.D. method. Also, this file construction method can be applied to an alternative method in which concrete is laid in the existing main section (the file) and the building steel frame is disposed on the concrete. According to the construction method of this file, when making the maximum use of the excellent history of the established file and placing the established main term in the leading end supporting layer through the putter, the borehole diameter can be reduced compared with the existing P.R.D. method, and economical efficiency and workability can be secured.

In addition, the pile assembly and the bi-directional load test method can be applied to a bi-directional load test under the work construction conditions. When this pile assembly or this bi-directional load test method is applied to the so-called "articulated hole" construction caused by the difference between the pile construction surface and the excavation surface, the quality of the unsupported tip support can be more accurately determined, . In addition, according to the present bi-directional load test method, when the heater pile method for curing the cement milk faster by using the heater is applied, not only the leading end supporting force of the pile but also the degree of the frictional force at the early stage can be confirmed, Is possible.

In addition, according to the present invention, since the conventional method in which the pipe for bidirectional load test remains in the ground at the time of the public works release is improved and can be removed, the subsequent process is not affected and the subsequent process can be performed without problems, And if the heater file method is applied, the load test can be carried out within a short period of time, so that the feedback can be performed in a short time.

It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention.

1: This file
2: Auxiliary files
21: Body
22: seat plate
221: upper seating hole
2211: Taper section
2212: Non-tapered section
23: opening
25: connection induction unit
251:
3: Anchor structure
31: Lower anchor fixing member
311: Lower outer brace set
312: Fixture unit
3121: Lower seating hole
313: Finger joint unit
3131: Male threads
3132: Steel wire fitting groove
314: Female thread portion
32: Anchor wire
33: upper strap set
4: Secondary file cap
41: Girder
42: hole
43: upper cap
44: Lower cap part
8: Bi-directional load test equipment
81: Bidirectional load test cell unit
811: Upward plate
812: Downward plate
813: Pressure device
82: Teletail rod pipe
821: Upper rod pipe
822: Lower load pipe
823: Foreign matter insertion prevention unit or fastening unit
9: Thinning
91: casing
92: Screw
94: putting equipment
95:
951: connection line
952: Heater
96: Steel Structure
97: Cement Milk

Claims (10)

1. A pile assembly for bidirectional loading test in an operation condition,
A bi-directional load test device including a bi-directional load cell unit;
A file in the shape of a tube which is seated on the bi-directional load cell unit and hollow inside;
An auxiliary file disposed on the file and having a seating plate having a plurality of upper seating holes formed on a tubular body; And
A plurality of lower anchoring fixtures fixedly disposed in the main pile corresponding to each of the plurality of upper seating holes, and a plurality of lower anchoring fixtures fixedly secured to the plurality of lower anchoring fixtures, And an anchor structure having a plurality of anchor steel rods fixedly secured with downward movement,
Wherein the anchor steel wire is seated in the upper seating hole in a tensioned state in which tensile force is applied so that the auxiliary file and the main file are interconnected,
Wherein the anchor structure is provided such that the anchor steel wire is detachable from the lower anchor fixing member in a tension release state in which the tensile force applied to the anchor steel wire is released,
The bidirectional load test apparatus includes:
A telltale rod pipe extending upwardly from the bidirectional load cell unit to pass through the through hole formed in the present file, the body of the auxiliary file, and the seating plate; And
And a Telltale rod connected to a bi-directional load cell unit with a lower end for bi-directional load test displacement measurement and extending upwardly through the interior of the telescopic load pipe upwardly of the seat plate. Assembly. delete The method according to claim 1,
The telescopic load pipe includes:
A lower load pipe connected to the bi-directional load cell unit;
An upper rod pipe having a lower end inserted into an upper opening of the lower rod pipe and having an upper end extending upwardly to pass through the through hole; And
And a foreign matter insertion preventing unit configured to close a space between the periphery of the upper opening and the lower rod pipe,
Wherein the upper rod pipe is removably disposed upwardly from the lower rod pipe. The method according to claim 1,
The anchor structure further includes an upper unchucked set having a shape that grips the upper periphery of the anchor steel wire and becomes narrower as the outer periphery thereof goes downward,
Wherein the upper seating hole has a tapered section whose width becomes narrower from the upper end to the lower end corresponding to the shape of the outer circumferential surface of the upper annular tooth set. The method according to claim 1,
Wherein the lower anchor fixing body comprises:
A lower eutectic set having a shape that grips the lower periphery of the anchor steel wire and becomes narrower toward the upper side; And
And a fixing hole unit having a lower seating hole having a tapered section whose width becomes narrower in accordance with the shape of the outer circumferential surface of the lower annular tooth set,
When the upper end of the anchor steel wire is rotated in the untensioned state, the portion of the lower anchor wire that is frictionally connected to the lower end of the anchor steel wire by the fitting engagement is screwed and moved downward, And is spaced downwardly from the lower seating hole. 6. The method of claim 5,
Wherein the lower anchor fixing body comprises:
A tongue interlocking unit interlocked with the upward and downward movement of the lower tongue set, the lower tongue set being connected to a lower portion of the lower tongue set so that the lower tongue set is not moved horizontally, and the male screw unit is projected downward; And
Further comprising a groove or a hole-like female threaded portion connected to a lower portion of the fuser unit and formed in a downwardly recessed manner so as to be capable of screwing with the male threaded portion,
Wherein the buckle interlocking unit is provided so that the male screw portion is not threadedly engaged with the female screw portion in the tense state in which the lower annular tooth set presses the inner circumferential surface of the lower seat hole by a tensile force applied to the anchor steel wire, . The method according to claim 6,
And a lower end of the anchor steel wire is formed at the upper end of the tongue interlocking unit,
Wherein the fitting engagement is performed such that a rotational friction force for rotating the male screw portion of the tangential linkage unit through the rotation of the anchor steel wire so that the male screw portion is threadably engageable with the female screw portion in a state in which the male screw portion has entered the female screw portion, And is formed between the lower end of the steel wire and the steel wire fitting groove,
And the lower end of the anchor steel wire is capable of upward displacement from the steel wire fitting groove when the anchor steel wire is pulled upward by a predetermined force or more in a state where the male screw portion and the female screw portion are screwed together. The method according to claim 1,
Wherein the auxiliary file includes a connection inducing unit protruding from the inner circumferential surface of the body to a lower side of the body so that the bottom surface and the top surface of the file are brought into contact with each other in a specific manner,
And an outer side surface of the lower end of the connection induction unit is provided with an inclined surface inclined toward the inside of the auxiliary file as it goes downward. In a bidirectional load test method in an open work condition,
(a) disposing a pile assembly according to claim 1 in a formed perforation;
(b) injecting cement milk into the main surface of the pile to cure the pile;
(c) performing a bi-directional load test using the bi-directional load testing device; And
(d) separating and extracting auxiliary files from the file using the anchor structure. 10. The method of claim 9,
Wherein the step (b) comprises the steps of: providing a heater inside the pile to contact the filling fluid filled in the pile file; and heating the pile through the heat of the heater Wherein the filling fluid is heated so that the cement milk is cured at a higher rate than room temperature curing.

Images