KR102194449B1 - Anchor apparatus for check prestressing force and construction method thereof - Google Patents

Abstract

The present invention relates to an anchor device capable of checking a tensile force, which can reliably and easily check, by naked eyes, a change in a tensile force of an underground anchor installed to suppress the ground deformation of a retaining wall or the slope of an excavation site; and to a constructing method thereof. According to the present invention, the anchor device comprises: a free unit provided between a fixing unit and a ground surface located in an underground perforated hole; a head unit installed to be exposed to the ground surface; a tendon having one end fixed to the fixing unit and extending through the free unit, and the other end fixed through the head unit; a first protective tube for surrounding the free unit of the tendon; a grout for filling the inside of the perforated hole to be integrated with the ground; a measurement material having one end fixed to a specific point of the underground perforated hole, the other end penetrating the head unit and extending to protrude to a front surface of the head unit, having a space between a fixed part and the head unit protected by a second protective tube not to be in direct contact with the grout, and having a predetermined strength; a rotating unit rotatable around a rotation center located at a front or side surface of the head unit, and having the other end of the measurement material fixed to one end thereof to convert a protruding length change of the measurement material into an angle change; and a display unit fixed to the rotating unit and visually displaying the angle change to check the same even from a long distance. Accordingly, a tensile force change of the tendon can be checked by naked eyes from a long distance by converting the protruding length change of the measurement material into the angle change of the rotating unit and visually displaying the same by the display unit.

Description

Anchor device capable of checking tension and its construction method {ANCHOR APPARATUS FOR CHECK PRESTRESSING FORCE AND CONSTRUCTION METHOD THEREOF}

The present invention relates to an anchor device capable of checking the tension and a construction method thereof, and more particularly, to a reliable and easy to visually check the change in tension of an underground anchor installed to suppress ground deformation of an earthen wall or slope of an excavation site. It relates to an anchor device capable of checking the tension force and its construction method.

As known in the field of civil engineering, an earth anchor (Earth Anchor or Ground Anchor) means an anchor installed in the ground, and it suppresses the deformation of the ground in various construction sites such as ground excavation work, slope stabilization, and construction methods for preventing buoyancy. It is frequently used for the purpose of doing.

The ground is drilled to a certain depth, and after inserting the tension member, grout is filled to integrate the tension member and the ground. When the grout material is sufficiently hardened, the tension member is tensioned and fixed to the head of the ground surface. It is a principle that suppresses the deformation of the ground near the surface by introducing a tension force into the tension member embedded in the ground and integrated with the surrounding ground.

Underground anchors may have a change in tension (increased or decreased) according to changes in various environmental factors, and the change in tension of the anchor may impair the safety of the ground or structure supported by the anchor, so appropriate additional measures are required.

A technique known to date as a method to check the change in tension of an underground anchor is generally a lift-off test in which a load cell is installed or re-tensioned in the anchor. In addition, as shown in Patent No. 10-1733999, a separate displacement measuring member is embedded together with the anchor body, and the decrease in the tension of the underground anchor can be estimated through a change in the length of the displacement measuring member.

However, the method of using the load cell as described above is difficult to apply to all anchors due to the problem of cost and the need for a complex electric device, and applying the retension test to all anchors also has a problem that cannot be a practical alternative.

Therefore, in the technology of Patent No. 10-1733999, it is inconvenient and safety to measure the change in length of the displacement measuring material by approaching the anchor located on the excavation or slope, and using a removable stopper is also preset. Since only two states of whether or not a certain length change has been exceeded are notified visually, sufficient information is not provided to the technician. In addition, since only a decrease in the tension force can be displayed, there is a problem in that the change cannot be confirmed when the tension force increases due to a displacement occurring in the ground near the ground surface.

Until now, due to such technical limitations and cost problems, tension measurement using a load cell has been performed for only a small number of anchors.

Republic of Korea Patent Publication 10-1733999 (announced on May 12, 2017) Republic of Korea Patent Publication 10-1118518 (2012.02.14. Announcement) Republic of Korea Patent Publication 10-2019-0078909 (published on May 5, 2019) Republic of Korea Patent Publication 10-2019-0078910 (published on May 5, 2019)

Therefore, the present invention for solving the above-described conventional problem, it is possible to reliably and easily check the change in the tension of the underground anchor installed to suppress the ground deformation of the soil wall or slope of the excavation site, and in particular, several m to several tens of It is an object of the present invention to provide an anchor device capable of checking the tension force and a construction method thereof that can be checked visually at a distance of m so that maintenance of an underground anchor and maintenance of ground deformation can be easily performed.

The problem of the present invention is not limited to those mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention for achieving the objects and other features of the present invention, a fixing unit located inside a hole drilled into the ground from the ground surface; A free portion between the fixing portion and the ground surface; A head installed to be exposed to the ground surface; A tension member having one end fixed to the fixing unit and extending through the free unit, and the other end passing through the head unit and fixed to the head unit; A first protective tube surrounding the free portion of the tension member; A grout that fills the perforated hole and integrates with the ground; One end is fixed to a specific point of the drilled hole in the ground, and the other end extends so as to protrude to the front of the head portion through the head portion, and between the fixed portion and the head portion is protected by a second protective tube so that it does not directly contact the grout, A measuring material having a certain strength; A rotating part that is rotatable about a rotation center positioned in front or side of the head part, and the other end of the measuring material is fixed at one end thereof to convert a change in protruding length of the measuring material into an angle change; Includes; a display unit that is fixed to the rotating unit and can visually display a change in the angle so that the change in angle can be confirmed from a distance, and converts the change in the protruding length of the measuring material into a change in the angle of the rotating unit and visually expresses it by the display unit from a distance to the naked eye. An anchor device is provided, characterized in that it is possible to check the change in tension of the tension member.

In one aspect of the present invention, the display portion may have a long shape formed by extending from the rotating portion.

In one aspect of the present invention, the display unit is configured in the form of a cap or cylinder that covers the rotating unit and rotates together with the rotating unit, and at least one of a color, a pattern, and a letter is provided on the outer surface, so that the angle from the reference point It is characterized by knowing the change of.

In one aspect of the present invention, at least a portion of the rotating portion in contact with the measuring member forms an arc portion having the same radius, so that the ratio of the change in the protrusion length of the measuring member and the change in the angle of the rotating portion may be adjusted using the radius of the arc portion.

In one aspect of the present invention, the rotation center may be formed to be fixed to the head portion or the protective cap.

In one aspect of the present invention, a weight or elastic means may be further included in the rotation unit or the display unit to apply a force that rotates in the rotation direction of the rotation unit so that the measurement material is not loosened.

In one aspect of the present invention, the other end of the tension member may be a rotation center, and a hollow rotation part surrounding the rotation center may be provided on the outside thereof.

According to another aspect of the present invention, a drilling step of forming a drilling hole to a certain depth in the ground; Inserting a measuring material protected by an anchor body and a protective tube into the perforation hole; Filling and curing the inside of the perforated hole with grout; Fixing the tension member of the anchor body to the head in a state in which the tension member is tensioned with a predetermined force; Mounting a rotating unit having a display unit capable of visually displaying an angle change on a rotation center located at the front or side of the head unit, and fixing the other end of the measuring material to the rotating unit; An anchor device construction method is provided, characterized in that it is possible to visually check the change in tension of the anchor installed in the ground, including; checking the change in tension of the tension member by observing the change in the angle of the rotating part.

In another aspect of the present invention, the step of adding a weight or elastic means to the rotating part or the display part; Including, it is made so that the measuring material is not loosened by applying a force to the rotating part to return in a direction in which the protruding length of the measuring material is increased. desirable.

In one aspect of the present invention, the step of installing a protective cap to protect the head; may further include.

According to the anchor device and its construction method capable of checking the tension according to the present invention provides the following effects.

First, the present invention compares the length of the measuring member to which the tension force is not introduced and the length of the tension member to derive the amount of change in the tension member, and by converting and displaying the change in the length of the tension member as small as several mm to tens of mm into an angle change, visual observation from a distance This has a possible effect.

Second, according to the present invention, since the anchors on the excavation surface and the slope are located in locations where it is difficult for a person to measure close proximity, it is possible to observe the naked eye from a certain distance, so that maintenance is very excellent.

Third, the present invention has the effect of confirming not only a decrease in tension but also an increase in tension.

Fourth, the present invention has the effect of being able to check the tension of the anchor very economically compared to the method using a conventional load cell.

The effects of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a schematic diagram showing a relationship between an anchor installed in the ground and a measuring material in an anchor device capable of checking tension according to the present invention.
Figure 2 is a schematic diagram showing the basic principle of the anchor device capable of checking the tension force according to the present invention.
Figure 3 is a perspective view showing a state of checking the angle change from the front of the head in the anchor device capable of checking tension according to the present invention.
4 is a perspective view showing a state in which an angle change is checked when a protective cap is configured on the head in the anchor device capable of checking tension according to the present invention.
5 is a perspective view showing an embodiment using a tension member and a tension spring in an anchor device capable of checking tension according to the present invention.
6 is a plan view showing an embodiment using a protective cap and a tension spring in an anchor device capable of checking tension according to the present invention.
7 is a plan view showing an embodiment using a tension member and a torsion spring in an anchor device capable of checking tension according to the present invention.
8 is a partially cut-away perspective view showing an embodiment using a protective cap and a torsion spring in an anchor device capable of checking tension according to the present invention.
9 is an exploded perspective view showing an embodiment of a coupling structure between a rotating part and a torsion spring in an anchor device capable of checking tension according to the present invention.
10 is a flowchart schematically showing a construction process of an anchor device capable of checking tension according to the present invention.

Additional objects, features, and advantages of the present invention may be more clearly understood from the following detailed description and accompanying drawings.

Prior to the detailed description of the present invention, the present invention is capable of various modifications and various embodiments, and the examples described below and shown in the drawings are intended to limit the present invention to specific embodiments. It should be understood as including all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

The terms used in the present specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

In addition, terms such as "... unit", "... unit", and "... module" described in the specification mean a unit that processes at least one function or operation, which is hardware, software, or hardware and It can be implemented as a combination of software.

In addition, in the description with reference to the accompanying drawings, the same reference numerals are assigned to the same components regardless of the reference numerals, and redundant descriptions thereof will be omitted. In describing the present invention, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

In addition, throughout the specification of the present application, when a step is positioned "on" or "before" another step, this is not only a case in which a step is in a direct time series relationship with another step, but also with the mixing step after each step. Likewise, the order of the two steps includes the same rights as in the case of an indirect time-series relationship that can change the order of the time series.

Hereinafter, an anchor device capable of checking tension and a construction method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, an anchor device capable of checking tension according to the present invention will be described in detail with reference to FIGS. 1 to 9.

1 is a schematic diagram showing a relationship between an anchor installed in the ground and a measuring material in an anchor device capable of checking tension according to the present invention, and FIG. 2 is a schematic diagram showing the basic principle of an anchor device capable of checking tension according to the present invention , Figure 3 is a perspective view showing a state of checking the angle change from the front of the head in the anchor device capable of checking tension according to the present invention, and Figure 4 is a protection on the head part in the anchor device capable of checking tension according to the present invention It is a perspective view showing a state in which the angle change is confirmed when the cap is configured. 5 is a perspective view showing an embodiment using a tension member and a tension spring in an anchor device capable of checking tension according to the present invention, and FIG. 6 is a perspective view showing an embodiment using a tension member and a tension spring in the anchor device capable of checking tension according to the present invention. It is a plan view showing an embodiment, and FIG. 7 is a plan view showing an embodiment using a tension member and a torsion spring in an anchor device capable of checking tension according to the present invention, and FIG. 8 is a protective cap in an anchor device capable of checking tension according to the present invention And a partially cut-away perspective view showing an embodiment using a torsion spring, and FIG. 9 is an exploded perspective view showing an embodiment of a coupling structure between a rotating part and a torsion spring in an anchor device capable of checking tension according to the present invention.

As shown in Fig. 1, the underground anchor is a structure in which the tension member 6 is integrated with the ground by the grout 3 filled in the perforated hole 2 to suppress the deformation of the ground surface. If the tension force introduced into the tension member 6 initially decreases due to some environmental change, the safety decreases, and if the surface deformation occurs, the tension force may increase. In order to secure the safety of the entire geotechnical structure, both the decrease and increase in tension must be managed and countermeasures must be established. However, until now, economical and effective technology is lacking, and tension is measured only for a small number of anchors.

The anchor device capable of checking the tension force according to the present invention measures a small change in length of the tension member due to the change (increase or decrease) of the initial tension force introduced into the tension member 6, and converts the change in the small length into an angle change. It is made easy to observe. Since most of the underground anchors are installed on the excavation or slope, it is difficult for an observer to approach and measure, so there is an advantage of being able to observe with the naked eye or an auxiliary means such as a telescope at a distance of several to tens of meters.

A general underground anchor includes a fixing part located inside the perforated hole 2 drilled from the ground surface to the ground, a free part protected by a tube between the fixing part and the ground surface, and a head part installed to be exposed to the ground surface ( 4), a tension member 6 fixed to the fixing part at one end and extending through the free part, and a tension member 6 fixed at the head part with a wedge 7 at the other end, and a grout that fills the inside of the perforated hole and integrates with the ground ( It consists of 3).

At this time, the fixing part is the length through which the tension member is fixed to the ground through the grout and transmits force to the surrounding ground, and the free part is the length that connects the head part and the fixing part by being protected by a tube or the like so that the tension member does not adhere to the grout. . In order to check the tension of such an underground anchor, one end is fixed to a specific point inside the drilled hole in the underground, and the other end extends to protrude to the front of the head through the head part 4, and the fixed part and The head portion is protected by a second protective tube 11 so that it does not directly contact the grout 3, and the measuring material 10 has a certain strength, and the rotation center 20 located in the front or side of the head portion It is rotatable, and the other end of the measuring material is fixed at one end and has a rotating part 30 that converts the change in the protruding length of the measuring material into an angular change, and is fixed to the rotating part so that the change in the angle of the rotating part can be visually displayed. Finally, the change in the length of the tension member 6 was confirmed by the display portion 40 that is there.

FIG. 2 is an exemplary embodiment briefly showing the basic principle of the present invention, including a rotation center 20, a rotation unit 30, and a display unit 40, and a guide means 51 for fixing the position thereof is provided with a through hole of the head ( 5). When the tension force introduced into the tension member 6 decreases, the length of the free part of the tension member decreases according to Hook's law, so that the head 4 moves in the direction of the arrow, and the measurement member 10 is unrelated to the change in tension. Since the protruding length increases, the angle change of the rotating part 30 occurs in proportion to the protruding length increase of the measuring material. The display unit 40 may be configured so that the change in the angle of the rotating unit can be observed with the naked eye at an appropriate distance.

An example including numerical values will be described in detail as follows.

When the tension force introduced into the tension member 6 decreases due to some factor, the length of the tension member decreases according to Hook's law, and the length of the measurement member 10 without the tension force introduced in proportion to the decrease in the length of the tension member is constant. As it is maintained, the protrusion length is increased with respect to the head part 4.

For example, if the length of the tension member decreases by 5 mm due to a 10% decrease in tension force, the other end of the measurement member is consequently protruded from the head by 5 mm. At this time, the protruding 5mm can be converted into a 30° angle change of the rotating part. In addition, when the tension of 10% is further reduced and the total tension is reduced by 20%, the length of the tension member decreases by 10mm, and as a result, the other end of the measurement member protrudes 10mm from the head. At this time, the protruding 10mm may be converted into a 60° angle change of the rotating part.

As described above, the reduction in the tension of the tension member decreases the length of the tension member, and when the length of the tension member decreases, the protruding length of the other end of the measurement member increases in proportion to this. By converting the change in the protruding length of the other end of the measurement material into a change in the angle of the rotating part, the degree of decrease in tension can be visually confirmed. In particular, since the installation location of the anchor is a place where it is difficult to measure the length due to close proximity of a person such as an excavation surface or a slope, visual confirmation can be easily performed at a distance of several meters to several tens of meters.

Since the part in contact with the measuring material of the rotating part is composed of an arc having a constant radius, a change in a certain protrusion length can be converted into a change in an angle proportional thereto. For example, the circumference of a cylindrical rotating part with an outer diameter of 25mm is 25π, which corresponds to about 78.5mm.If the protruding length of the other end of the measuring material changes by 10mm, the angle change of about 46° is visually shown (10÷78.5×360°= 46°).

With the same calculation method, if the protrusion length changes by 20mm, you can check the angular change of about 92°. It would be easier to check the change in angle of 46° to 92° than to visually check the change in length of 10 mm to 20 mm at a distance of several tens of m. At this time, it is obvious that the ratio of the change in the length of the measuring material and the change in the angle of the rotating part can be adjusted by adjusting the radius of the rotating part.

The present invention can be applied by variously modifying the shape and position of the rotating part and the display part by using this principle, and will be described in detail with reference to FIGS. 3 to 8 through examples thereof.

As shown in Fig. 3, a guide means 52 is installed in the through hole 5 of the head 4, and a rotation center 20 is provided at the end of the guide means, and a rotating unit capable of rotating around it ( 30) and the display unit 40 having a long length extending from the rotation unit are configured. The measuring material 10 passes through the through hole 5 and is fixed to the rotating part 30. When a change in the tension force of the tension member 6 occurs, the protruding length of the measurement member 10 changes, and in proportion to this, a change in the rotation angle of the rotation unit 30 is caused, so that the change in the angle of the display unit can be observed.

4 is a protective cap 8 added to the embodiment of FIG. 3, and in the case of an anchor installed for a long-term use, the head 4 is covered to prevent corrosion. At this time, the change in the tension of the tension member 6 can be confirmed by using the same configuration as in FIG. 3 from the outside of the protective cap 8.

In the present invention, it would be more preferable to provide a heavy weight on the display portion 40 to apply a slight force in the direction in which the rotating portion rotates to prevent the measurement material from becoming loose.

5 is an embodiment using the end of the tension member 6 extending to the front of the head portion 4 as the rotation center 21. The measuring material 10 passes through the through hole 5 and surrounds the hollow rotating part 30 surrounding the end of the tension member, which is the rotation center 21, and is connected to the tensioned tension spring 61, and finally the display part 40 ) Is fixed to the top of the rotating part 30 to complete the installation.

It is convenient to fix the end of the tension spring 61 to another tension member 6, and for simplicity, a wedge fixing the tension member to the head is not shown in the drawing.

6 is an embodiment in which a protective cap 8 for protecting the head 4 is further added, and a rotation center 20 is provided on the outside of the protective cap, and the measuring material 10 is outside the protective cap. The tension spring 61, which is extended and fixed to the rotating part, is introduced to prevent loosening of the measuring material, and the end thereof may be fixed to a specific point of the protective cap in the extended state.

7 is an embodiment in which the end of the tension member 6 is used as the rotation center 21 and a torsion spring 62 is introduced to prevent looseness of the measurement member 10 as in the embodiment of FIG. 5. One end of the torsion spring 62 is fixed to the adjacent tension member 6 and the other end is fixed to the rotating part 30 to apply a rotational force to the rotating part, thereby preventing the measurement material from loosening.

FIG. 8 is a torsion spring provided with a rotation center 22 on the outside of the protection cap when there is a protection cap 8, one end of which is fixed to the locking projection 74 and the other end of which is fixed to the rotation part 30 ( 62), and the measurement material 10 that has passed through the through hole 5 passes through the second opening 73 of the protective cap, and is wound around the outer diameter of the rotating part 30 several times and then fixed.

The fixing bolt 71 passes through the first through hole 72 provided in the protection cap 8 and is coupled to the nut portion 75 provided in the head portion 4 so that the protective cap is firmly coupled with the head portion. . Finally, by fixing the cap-type display part 41 to the upper end of the rotating part 30, the change in the protruding length of the measuring material 10 can be converted into a change in the angle of the rotating part and the display part. Changes in the rotation angle can be checked by adding a needle that can indicate the direction to the cap-type display part 41, and a specific standard is set on the top surface of the protective cap 8, and a certain sign is placed on the side of the cap-type display part. ), you can easily observe the change of the rotation angle. At this time, the cover can be applied in various ways, such as colors, patterns, and symbols.

The inner diameter of the coil of the torsion spring 62 is fitted to the rotation center 21, and the lower arm is fixed to the end of the adjacent tension member 61, and the rotation part 30 is configured to wrap the torsion spring inside it. It is preferable to form an incision on the lower side so that the upper arm of the torsion spring 62 penetrates and extends so that the rotating part and the torsion spring rotate together.

In addition, the inner diameter of the coil of the torsion spring 62 is fitted into the rotation center 22, the lower arm is fixed to the locking projection 74, and the rotation part 30 is configured to wrap the torsion spring inside it, but the lower side It is preferable to form a cutout 31 in the torsion spring 62 so that the upper arm of the torsion spring 62 penetrates and extends so that the rotating part and the torsion spring rotate together (see FIG. 9).

In the above embodiment, having a weight or elastic means (spiral spring, torsion spring, tape, etc.) to prevent the measurement member 10 from being loose is different from introducing a tension force to the tension member 6, and the tension member has a tension force. A change of about 10% involves a change in length of several mm to several tens of mm, but it means that a little tension is applied to the extent that the measurement material is not simply loose. That is, a very low degree of tension is applied compared to the breaking load of the measuring material.

One end of the measuring member 10 may be fixed to a specific point of the grout 3 or the tension member 6 in the ground. A certain length of one end of the measuring material 10 embedded in the grout 3 is not protected by the protective tube 11 and is exposed to the grout so as to be integrated so that it does not move. In addition, it may be fixed to a specific point of the tension member 6 and protected with a single protective tube together with the tension member to be embedded in the grout.

It is preferable to use a stranded wire made by twisting several wires as the measuring material, and various parts used for fixing or connecting the stranded wire such as a crimping sleeve and a screw-tightening sleeve can be used to fix the other end of the measuring material.

7 to 9, if the other end of the measuring material 10 is wound several times around the outer diameter of the rotating part 30 and then fixed, slipping does not occur due to friction between the measuring material and the outer diameter of the rotating part.

The fixing bolt 71 passes through the first opening 72 and is coupled to the head, and the measurement material passes through the second opening 73. The locking projection 74 fixes one end of the torsion spring 62 and serves to limit the movement of the rotating part 30. The plurality of (for example, three) locking protrusions and the protrusions next to the second opening limit the left and right movement of the rotating part 30, and the other end of the torsion spring extending outside the rotating part is on the locking protrusion 74. It is caught and rotation is restricted.

In addition, the rotating part 30 can be rotated, but its upward movement is limited by the head of the fixing bolt 71. The fixing bolt 71 penetrates the center of the rotation center and is screwed to the head part (the protective cap is fixed to the head part by pressing the upper end of the rotation center).

In this state, the measuring material is wound on the rotating part, rotation is introduced into the torsion spring, the end of the measuring material is fixed to the rotating part (or one end of the torsion spring), and finally the cap-type display part is fixed to the upper end of the rotating part.

Next, a method of constructing an anchor device capable of checking tension according to the present invention will be described with reference to FIG. 10. 10 is a flowchart schematically showing the construction process of the anchor device capable of checking tension according to the present invention.

The construction method of the anchor device capable of checking the tension force according to the present invention is perforated to form the perforated hole 2 from the ground surface 1 to a certain depth (S10). At this time, the ground surface (1) refers to a ground surface that needs reinforcement with anchors, such as an excavation surface or a slope.

Then, the measuring material protected by the anchor body and the protective tube is inserted into the perforation hole (S20). Next, the inside of the hole is filled with grout 3 and cured (S30).

Then, after the curing is completed, the tension member 6 of the anchor body is fixed to the head 4 in a state in which the tension member 6 is tensioned with a predetermined force (S40). The tension member is usually fixed using a wedge 7 divided into three pieces.

Next, a rotating unit having a display unit capable of visually displaying an angle change is mounted on a rotation center located at the front or side of the head unit, and the other end of the measuring material is fixed to the rotating unit (S50). It is easy to pass the measurement material by forming a through hole 5 in the head part 4, and if only a certain length is maintained, it may be installed by bypassing the head part.

And by observing the change in the angle of the rotating part 30 to confirm the change in the tension of the tension member (6) (S60). At this time, the change in the angle of the display unit can be checked with the naked eye, and the change in the tension force can be calculated by converting the change in the length of the tension member from the change in the angle of the display unit.

The measuring material may be prevented from loosening by applying a force to the rotating part or the display part by adding a weight (weight) or adding an elastic means to the rotating part in a direction in which the protruding length of the measuring material is elongated ( S70).

In addition, the step of installing a protective cap to protect the head may be further included to protect the head and the other end of the tension member from the external environment (S80).

According to the anchor device capable of checking the tension force according to the present invention and its construction method as described above, the change in tension is derived by comparing the length of the measuring member to which the tension is not introduced and the length of the tension member, and is about several mm to tens of mm. Visual observation is possible from a distance by converting the length change of a small tension member into an angle change, and since the anchors on the excavation surface and the slope are located in locations where it is difficult for a person to measure close proximity, it is possible to observe with the naked eye from a certain distance. It has a very good advantage. Here, the naked eye observation includes the use of auxiliary tools such as a naked eye or a telescope, a camera equipped with a zoom lens.

In addition, the present invention can confirm not only a decrease in tension, but also an increase in tension, and has the advantage of being able to check the tension of the anchor very economically compared to a method using a conventional load cell.

Although the above-described embodiments have been described by the limited drawings, a person of ordinary skill in the art can apply various technical modifications and variations based on the above. For example, the described techniques are performed in a different order from the described method, and/or components such as a system, structure, device, circuit, etc. described are combined or combined in a form different from the described method, or other components Alternatively, even if substituted or substituted by an equivalent, an appropriate result can be achieved.

The embodiments described in the present specification and the accompanying drawings are merely illustrative of some of the technical ideas included in the present invention. Accordingly, it is obvious that the embodiments disclosed in the present specification are not intended to limit the technical idea of the present disclosure, but to explain the technical idea, and thus the scope of the technical idea of the present disclosure is not limited by these embodiments. Modification examples and specific embodiments that can be easily inferred by those skilled in the art within the scope of the technical idea included in the specification and drawings of the present invention should be interpreted as being included in the scope of the present invention.

1: ground surface
2: perforated hole
3: grout
4: head
5: through hole
6: tension material
7: wedge
8: protective cap
9: The first protective officer
10: measuring material
11: The 2nd Sheriff
20, 21, 22: center of rotation
30: rotating part
31: incision
40: display
41: cap type display
51, 52, 53: fixing means
61: tension spring
62: torsion spring
71: fixing bolt
72: first opening
73: second opening
74: stumbling jaw
75: nut part
S10: hole drilling step
S20: step of inserting a hole in the anchor body/measurement material
S30: grout curing step
S40: Tension member fixing step
S50: step of fixing the measuring material
S60: Step of confirming change in tension member
S70: Step of adding weight (elastic means)
S80: protective cap installation steps

Claims (10)

A fixing unit located inside the hole drilled from the ground to the ground;
A free portion between the fixing portion and the ground surface;
A head installed to be exposed to the ground surface;
A tension member having one end fixed to the fixing unit and extending through the free unit, and the other end passing through the head unit and fixed to the head unit;
A first protective tube surrounding the free portion of the tension member;
A grout that fills the perforated hole and integrates with the ground;
One end is fixed at a specific point of the drilled hole in the ground, and the other end extends to protrude to the front of the head through the head, and between the fixed part and the head is protected by a second protective tube so that it does not directly contact the grout, A measuring material having a certain strength;
A rotating unit that is rotatable around a rotation center positioned in the front or side of the head unit, and the other end of the measurement material is fixed at one end thereof to convert a change in protruding length of the measurement material into an angle change;
Includes; a display unit that is fixed to the rotation unit and can visually display the angle change so that it can be confirmed from a distance
The rotation unit, the other end of the tension member as a rotation center, is formed as a hollow rotating part surrounding the rotation center is provided on the outside of the tension member,
By converting the change in the protruding length of the measuring material into the change in the angle of the rotating part and visually expressing it by the display, it is possible to check the change in the tension of the tension member with the naked eye from a distance.
Anchor device.
The method of claim 1,
The display unit
Characterized in that it has a long shape formed by extending from the rotating part
Anchor device.
The method of claim 1,
The display unit is configured in the form of a cap or cylinder that covers the rotating unit and rotates with the rotating unit, and at least one mark among colors, patterns, and letters is provided on the outer surface so that the change of the angle from the reference point can be known. With
Anchor device.
The method of claim 1,
At least a portion of the rotating part in contact with the measuring material forms an arc having the same radius, so that the ratio of the change in the protruding length of the measuring material and the change in the angle of the rotating part can be adjusted using the radius of the arc
Anchor device.
The method of claim 1,
The rotation center is characterized in that formed to be fixed to the head portion or the protective cap
Anchor device.
The method of claim 1,
Characterized in that the measurement material is not loosened by applying a force to rotate in the rotational direction of the rotation unit, further comprising a weight or elastic means on the rotation unit or the display unit
Anchor device.
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