Anchor acupressure plate assembly for improving frictional force

Abstract

An anchor pressure plate assembly used for installing an earth anchor inserted into a bore hole drilled in the ground comprises: a base pressure plate provided at the lower part of a load-bearing body inserted into a bore hole drilled in the ground, configured to support a concentrated load applied to the leading edge of the load-bearing body when a steel wire is tensioned; a central column provided at the upper part of the load-bearing body and configured in the shape of a vertically elongated cylinder; and a plurality of pressure plates provided at regular intervals along the longitudinal direction of the central column, configured to form a disc-shaped plate structure, and configured to allow a steel wire, wound in a 'U' shape at the front of the load-bearing body and extending to the rear of the load-bearing body, to be fitted therein. The above base pressure plate is characterized by having a diameter 1.19 to 1.47 times larger than the pressure plate. Accordingly, it is possible to provide an anchor bearing plate assembly for improving frictional force, which can maximize frictional force when installing an anchor using steel wire into a bore hole drilled in the ground in earth anchor methods, SCW methods, and CIP methods, and by allowing the quantity and size of bearing plates to be easily varied according to the soil type of the construction ground and the bore depth of the bore hole, thereby enabling easy construction without a decrease in frictional force according to the site conditions of the construction site and ensuring that the construction quality is always uniformly good.

Description

Technology Field

[0001] The present invention relates to an anchor pressure plate assembly for improving friction, and more specifically, to an anchor pressure plate assembly for improving friction that can maximize friction when an anchor using steel wire is installed inside a drilled hole in the ground in earth anchor methods, SCW methods, and CIP methods, and can easily vary the quantity and size of the pressure plates according to the soil type of the construction ground and the drilling depth of the drilled hole, thereby enabling easy construction without a decrease in friction according to the site conditions of the construction site, and at the same time, ensure that the construction quality is always uniformly good. Background Technology

[0002] Generally, the earth anchor method is a method of securing a retaining wall by drilling a hole in the wall, inserting reinforcing bars or PC steel wires, grouting the area with mortar, and creating an anchor on the back. Instead of using supports, a hole is drilled in the retaining wall with an earth drill, tension materials such as reinforcing bars or PC steel wires are inserted into the hole, the area is grouted with mortar to harden, and then tension is applied from the outside to anchor the PC steel wires or reinforcing bars.

[0003] However, when this earth anchor method is constructed in soil layers prone to loss of grout or low frictional resistance, the grout inside the anchor hole is lost, making it impossible to expect frictional force, or the low shear strength of the ground prevents the application of tensile force. Furthermore, if grout loss occurs, a significantly large amount of injection is required to fill surrounding voids in order to secure the necessary tensile force.

[0004] Recently, the anchor method has been proposed. The anchor method involves pressurizing and injecting grout into the anchor installed in the anchoring section to tightly bond the enlarged and cured anchoring bulb with the ground.

[0005] An example of an anchor device according to the prior art is disclosed in Korean Utility Model Registration No. 20-0426625 (registered on September 8, 2006, hereinafter referred to as 'Patent Document 1'), etc.

[0006] However, according to the conventional technology, anchor devices are constructed with a structure that expands only through grouting pressure. Consequently, there is a problem in that after construction by pressure grouting, the tensile strength weakens when the grout is damaged due to cement hardening, water absorption, load, etc., and the steel strands can easily slip out again when external tensile force is applied, resulting in a construction with relatively weak strength.

[0007] Meanwhile, in addition to the earth anchor method, there is a problem in that frictional force may be reduced when installing anchors using steel strands in the SCW (Soil Cement Wall) method, which involves directly mixing cement paste into the soil to continuously install concrete piles in the field to complete a continuous underground wall, or in the CIP (Cast In Place Pile) method, which involves drilling holes in the ground with a drilling machine, filling the voids after extraction with concrete, mortar, or soil cement, and then erecting reinforcing bars, steel frames, or PC piles as needed to continuously install cast-in-place piles in parallel. Prior art literature

[0008] Republic of Korea Utility Model Registration No. 20-0426625 (Registered on September 8, 2006) The problem to be solved

[0009] The objective of the present invention is to provide an anchor bearing plate assembly for improving frictional force, which can maximize frictional force when installing an anchor using a steel wire into a bore hole drilled in the ground in earth anchor methods, SCW methods, and CIP methods, and allows the quantity and size of bearing plates to be easily varied according to the soil type of the construction ground and the bore depth of the bore hole, thereby enabling easy construction without a decrease in frictional force according to the site conditions of the construction site, and at the same time ensuring that the construction quality is always uniformly good. means of solving the problem

[0010] To achieve the above objective, according to the present invention, an anchor pressure plate assembly used for constructing an earth anchor inserted into a bore hole drilled in the ground comprises: a base pressure plate provided at the lower part of a load-bearing body inserted into a bore hole drilled in the ground, configured to support a concentrated load applied to the leading edge of the load-bearing body when a steel wire is tensioned; a central column provided at the upper part of the load-bearing body and configured in the shape of a vertically elongated cylinder; and a plurality of pressure plates provided at regular intervals along the longitudinal direction of the central column, configured to form a disc-shaped plate structure, and configured to allow a steel wire, wound in a 'U' shape at the front of the load-bearing body and extending to the rear of the load-bearing body, to be fitted therein.

[0011] The above base pressure plate is characterized by having a diameter 1.19 to 1.47 times larger than the pressure plate.

[0012] Here, it is preferable that the base pressure plate be provided with two layers of upper and lower pressure plates overlapping each other in a sliding manner at the bottom of the load-bearing body.

[0013] In addition, it is preferable that a plurality of steel wire insertion slots are formed by recessing on the surface of the pressure plate in a mutually symmetrical manner, radially from the outer perimeter toward the center, so that the steel wires are inserted into the inner side of the steel wire insertion slots. Effects of the invention

[0014] According to the present invention, when installing an anchor using a steel wire into a bore hole drilled in the ground in the earth anchor method, SCW method, and CIP method, the frictional force can be maximized, and the quantity and size of the pressure plates can be easily varied according to the soil type of the construction ground and the bore depth of the bore hole, thereby enabling easy construction without a decrease in frictional force according to the site conditions of the construction site, and at the same time, providing an anchor pressure plate assembly for improving frictional force that can ensure the construction quality is always uniformly good. Brief explanation of the drawing

[0015] FIG. 1 is a perspective view of an anchor pressure plate assembly for improving frictional force according to the present invention. FIG. 2 is an exploded perspective view of the base pressure plate of FIG. 1. FIG. 3 is a perspective view of an anchor pressure plate assembly for improving frictional force according to another embodiment of the present invention. FIG. 4 is a side view illustrating the state in which the anchor pressure plate assembly for improving frictional force of FIG. 3 is inserted into the interior of a drilled hole. FIG. 5 is a side view of an anchor pressure plate assembly for improving frictional force of FIG. 4. FIG. 6 is an enlarged side view of the anchor pressure plate assembly for improving frictional force of FIG. 5. FIG. 7 is a top view of the anchor pressure plate assembly for improving frictional force of FIG. 6. FIG. 8 is an exploded perspective view illustrating the process of the anchor pressure plate assembly for improving frictional force of FIG. 6 being coupled to a load-bearing body. FIG. 9 is a side view of an anchor pressure plate assembly for improving frictional force according to another embodiment of the present invention, FIG. 10 is a perspective view illustrating another embodiment of an anchor pressure plate assembly for improving frictional force according to the present invention, wherein the number of pressure plates is further increased and the length of the central column is further increased depending on the soil type and tensile force of the ground where the assembly is constructed. Specific details for implementing the invention

[0016] The following objects, other objects, features, and advantages of the present invention will be easily understood through the following preferred embodiments associated with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms.

[0017] Rather, the embodiments introduced herein are provided to ensure that the disclosed content is thorough and complete, and to ensure that the spirit of the invention is sufficiently conveyed to those skilled in the art.

[0018] The embodiments described and illustrated herein also include complementary embodiments.

[0019] In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. Components referred to as 'comprise' and / or 'comprising' as used in this specification do not exclude the presence or addition of one or more other components.

[0020] The present invention will be described in detail below with reference to the attached drawings.

[0021] FIG. 1 is a perspective view of an anchor pressure plate assembly for improving frictional force according to the present invention, FIG. 2 is an exploded perspective view of the base pressure plate (100) of FIG. 1, FIG. 3 is a perspective view of an anchor pressure plate assembly for improving frictional force according to another embodiment of the present invention, FIG. 4 is a side view showing the state in which the anchor pressure plate assembly for improving frictional force of FIG. 3 is inserted into the interior of a drilled hole (10), FIG. 5 is a side view of the anchor pressure plate assembly for improving frictional force of FIG. 4, FIG. 6 is an enlarged side view showing the anchor pressure plate assembly for improving frictional force of FIG. 5, FIG. 7 is a top view of the anchor pressure plate assembly for improving frictional force of FIG. 6, FIG. 8 is an exploded perspective view showing the process of the anchor pressure plate assembly for improving frictional force of FIG. 6 being coupled to a load-bearing body (20), FIG. 9 is an anchor pressure plate assembly for improving frictional force according to yet another embodiment of the present invention FIG. 10 is a side view and is a perspective view illustrating another embodiment in which the number of pressure plates (120) is further increased and the length of the central column (110) is further increased depending on the soil and tensile force of the ground where the anchor pressure plate assembly for improving frictional force according to the present invention is constructed.

[0022] An anchor pressure plate assembly for improving frictional force according to the present invention is used to construct an earth anchor inserted into a drilled hole (10) in the ground as shown in FIGS. 1 and 2, and comprises a base pressure plate (100) provided at the bottom of a load-bearing body (20) inserted into a drilled hole (10) in the ground to support a concentrated load applied to the front end of the load-bearing body (20) when the steel wire (30) is tensioned, a central column (110) provided at the top of the load-bearing body (20) and provided in the shape of a long vertical cylinder, and a plurality of pressure plates (120) provided at regular intervals along the longitudinal direction of the central column (110) and arranged to form a disc-shaped plate structure, and provided to allow a steel wire (30) to be inserted, which is wound in a 'U' shape at the front of the load-bearing body (20) and extends to the rear of the load-bearing body (20).

[0023] Here, the base pressure plate (100) is characterized by having a diameter 1.19 to 1.47 times larger than that of the pressure plate (120).

[0024] Accordingly, in the earth anchor method, SCW method, and CIP method, frictional force can be maximized when installing an anchor using a steel wire (30) inside a drilled hole (10) drilled in the ground, and the quantity and size of the pressure plates (120) can be easily varied according to the soil type of the construction ground and the drilling depth of the drilled hole (10), thereby allowing construction to be easily performed without a decrease in frictional force according to the site conditions of the construction site, and at the same time, the construction quality can always be uniformly good. Furthermore, by ensuring that the load concentrated at the tip of the load-bearing body (20) during tensioning of the steel wire (30) is appropriately distributed and supported through the base pressure plate (100), the contact area with the grout is further increased by the base pressure plate (100), thereby further increasing frictional force, and the strength can be reinforced to prevent damage to the load-bearing body (20) and the anchor pressure plate assembly, thereby providing an anchor pressure plate assembly for improving frictional force. there is.

[0025] At this time, if the diameter of the base pressure plate (100) is less than 1.19 times the diameter of the pressure plate (120), the load distribution effect and the frictional force and strength increase effect through the base pressure plate (100) may become somewhat insignificant, and if it exceeds 1.47 times, the size of the base pressure plate (100) becomes too large compared to the size of the pressure plate (120), and the base pressure plate (100) may instead be damaged too easily.

[0026] Meanwhile, as shown in FIG. 2, it is preferable that the base pressure plate (100) be provided with upper and lower two layers of pressure plates (105, 107) overlapping each other in a sliding manner at the bottom of the load-bearing body (20).

[0027] Accordingly, the base pressure plate (100) is provided with two layers of upper and lower pressure plates (105, 107) overlapping, thereby further enhancing the structural strength of the base pressure plate (100). Additionally, by allowing the two layers of upper and lower pressure plates (105, 107) to overlap each other in a sliding manner to form the base pressure plate (100), the ease of assembly is improved, allowing the assembly and construction process of the base pressure plate (100) to be carried out easily and conveniently.

[0028] More specifically, as illustrated in FIG. 2, the base pressure plate (100) includes a first pressure plate (105) that is first coupled to the lower part of the load body (20), and a second pressure plate (107) that is coupled between the first pressure plate (105) and the load body (20). The first pressure plate (105) has a sliding slot (101) formed on its surface with one side open so that it can be coupled by sliding horizontally on one side of the lower part of the load body (20), and the second pressure plate (107) has a sliding slot (101) formed on its surface with the other side open so that it can be coupled by sliding horizontally on the other side of the lower part of the load body (20) symmetrically to the first pressure plate (105).

[0029] Here, when both the first pressure plate (105) and the second pressure plate (107) are slidably positioned at the bottom of the load-bearing body (20), it is preferable that the first pressure plate (105) and the second pressure plate (107) be fastened and joined by bolts.

[0030] Meanwhile, as illustrated in FIGS. 1 and 2, the anchor pressure plate assembly for improving frictional force according to the present invention may be provided with two or more load-bearing bodies (20) in such a way that there are two or more corresponding base pressure plates (100) provided at the bottom of each load-bearing body (20), and a central column (110) and a pressure plate (120) provided at the top of each load-bearing body (20).

[0031] As another embodiment of the present invention, an anchor pressure plate assembly for improving frictional force may include only a central column (110) provided on the upper part of a load-bearing body (20) that is inserted into a drilled hole (10) in the ground, without the configuration of a base pressure plate (100) as shown in FIGS. 3 to 7, and a plurality of pressure plates (120) provided at regular intervals along the longitudinal direction of the central column (110) to form a disc-shaped plate structure, and configured to be fitted with a steel wire (30) that is wound in a 'U' shape from the front of the load-bearing body (20) and extends to the rear of the load-bearing body (20).

[0032] Here, the pressure plate (120) is provided with an outer diameter 1.17 to 2.89 times larger than the outer diameter of the central column (110) so that the tension area is expanded when the steel wire (30) is tensioned, and the tension force is improved by increasing the frictional force when the earth anchor is installed.

[0033] At this time, if the outer diameter of the pressure plate (120) is less than 1.17 times the outer diameter of the central column (110), the degree of expansion of the tension area is not large, so the effect of increasing frictional force when tensioning the steel wire (30) may be somewhat insignificant, and if it exceeds 2.89 times, the durability may be reduced, such as when the central column (110) easily buckles when tensioning the steel wire (30).

[0034] Here, the load-bearing body (20) is inserted into the interior of a drilled hole (10) in the ground as shown in FIGS. 3 to 5, and is configured so that a steel wire (30) is wound forward and extended backward.

[0035] It is preferable that the load-bearing body (20) be made of an alloy material such as tungsten, molybdenum, nickel, or iron, which has a high specific gravity.

[0036] As shown in FIGS. 3 to 5, the steel wire (30) is fitted into a steel wire clamp formed concavely on the outer surface of the load-bearing body (20), wound in a 'U' shape toward the front of the load-bearing body (20), and extends toward the rear of the load-bearing body (20).

[0037] More specifically, one end of the steel wire (30) may be fixed to a device such as an external hydraulic cylinder and may be provided with elasticity so that it extends when pulled out and contracts again when released, storing tensile force inside.

[0038] As an embodiment of the present invention, the sum of the self-weights of the load-bearing body (20) and the steel wire (30) can be approximately 70 to 90 kg.

[0039] At this time, the earth anchor can be inserted into the interior of the drilled hole (10) at a speed of approximately 10 to 20 m / s.

[0040] As shown in FIG. 8, the central column (110) includes a connecting coupler (111) provided between it and the load-bearing body (20), and is detachably connected to the upper part of the load-bearing body (20) by the connecting coupler (111).

[0041] Accordingly, the process of installing an anchor pressure plate assembly for improving frictional force according to the present invention on the upper part of the load-bearing body (20) can be easily performed in a detachable manner by means of a connecting coupler (111).

[0042] As shown in FIG. 8, the connecting coupler (111) is formed such that the front is thinner to correspond to the inner diameter of the load body (20) so that the lower part is fitted into the interior of the load body (20), and the rear is formed such that the upper part is thicker than the front so that it is fitted into the interior of the central column (110), and a stopper is formed between the thinner front and the thicker rear so that the outer diameter is expanded to be thicker than the rear.

[0043] And, a fastening hole is formed in the front of the connecting coupler (111) which is inserted into the interior of the load-bearing body (20) so that a fastening member (113), such as a pin or bolt, can pass through and fasten it.

[0044] As shown in FIGS. 3 and 4, the number of pressure plates (120) provided on the central column (110) is determined and applied according to the soil of the ground where the drilling hole (10) is drilled and the drilling depth of the drilling hole (10), and it is preferable that the outer diameter is also determined and applied differently according to the size of the drilling hole (10).

[0045] Accordingly, the quantity and size of the pressure plates (120) can be easily varied according to the soil type of the construction ground, the drilling depth of the drilling hole (10), and the size of the drilling hole (10), thereby allowing construction to be easily performed without the friction force decreasing according to the site conditions of the construction site, and at the same time, the construction quality can always be achieved consistently.

[0046] That is, depending on the soil type of the ground where the drilling hole (10) is drilled and the drilling depth and inner diameter of the drilling hole (10), it is desirable to prepare the anchor pressure plate assembly according to the present invention in advance in various types with different quantities and outer diameters of pressure plates (120), and to use the appropriate one according to the conditions of the construction site.

[0047] In one embodiment of the present invention, the central column (110) and the pressure plate (120) are described as being integrally formed to form an anchor pressure plate assembly; however, in another embodiment of the present invention, multiple pressure plates (120) may be detachably connected to the central column (110).

[0048] When the pressure plate (120) is detachably coupled to the central column (110), as shown in FIG. 9, the plate fixing part (115) is formed concavely at regular intervals along the longitudinal direction of the central column (110) so that the pressure plate (120) is seated and fixed, and the center of the pressure plate (120) is provided with a column pressure protrusion including an elastic member that reduces the inner diameter at the plate fixing part (115).

[0049] At this time, the pressure plate (120) may be welded to the central column (110) while seated on the plate fixing part (115), or a screw thread may be formed on the plate fixing part (115) so that the pressure plate (120) is screw-coupled.

[0050] Meanwhile, as shown in FIGS. 3 and 7, it is preferable that a plurality of steel wire insertion slots (121) are formed in a mutually symmetrical manner radially from the outer circumference toward the center on the plate surface of the pressure plate (120) so that the steel wire (30) is inserted into the inside of the steel wire insertion slots (121).

[0051] Accordingly, by allowing the steel wire (30) to consistently pass through a plurality of pressure plates (120) through the steel wire insertion slot (121), the frictional force can be uniformly increased by the pressure plates (120) when the steel wire (30) is tensioned.

[0052] As an embodiment of the present invention, as shown in FIG. 7, it is preferable that the steel wire insertion slot (121) be formed to form an approximate cross shape based on the central column (110).

[0053] Here, as shown in FIG. 9, a guide roller (123) may be provided on the inner side of the tension wire insertion slot (121) so that the tension wire (30) comes into rolling contact when the tension wire (30) is tensioned and the tension of the tension wire (30) is smoothly guided.

[0054] Accordingly, when the steel wire (30) moves within the steel wire insertion slot (121) during tensioning of the steel wire (30), wear damage caused by contact between the pressure plate (120) and the steel wire (30) can be cushioned and prevented by the guide roller (123).

[0055] Meanwhile, as illustrated in FIGS. 1 to 10, it is preferable that the pressure plates (120) of the anchor pressure plate assembly for improving frictional force according to the present invention be provided such that their outer diameter gradually expands toward the bottom.

[0056] Accordingly, by arranging the outer diameter of the pressure plate (120) to gradually expand from the top to the bottom along the depth of the perforated hole (10), the frictional force and tensile force can be further increased from the top to the bottom when the steel wire (30) is tensioned. Even if the pressure plate (120) on the upper side is damaged, the pressure plate (120) on the lower side is larger, so the effect on the increase in frictional force by the pressure plate (120) on the lower side is blocked, thereby ensuring that the overall construction quality remains good even when the pressure plate (120) on the upper side is damaged.

[0057] Here, it is preferable that the pressure plates (120) be arranged to expand so that as they go downward, the lower pressure plate (120) becomes approximately 1.14 to 1.33 times larger in diameter than the upper pressure plate (120).

[0058] Accordingly, when the tension of the tension wire (30) is stretched, the frictional force and tension force can be more effectively increased by the pressure plates (120) as they go from the top to the bottom.

[0059] At this time, if the diameter of the lower pressure plate (120) is less than 1.14 times the diameter of the upper pressure plate (120), the effect of increasing friction and tensile force may be somewhat reduced, and if it exceeds 1.33 times, the lower pressure plate (120) becomes too large compared to the upper pressure plate (120), and the lower pressure plate (120) may be damaged too easily compared to the upper pressure plate (120) during the tensioning process of the steel wire (30).

[0060] Meanwhile, as illustrated in FIG. 10, it is preferable that the anchor pressure plate assembly for improving frictional force according to the present invention has an additional number of pressure plates (120) (e.g., four or more instead of three) depending on the soil type and tensile force of the ground being constructed, and that the length of the central column (110) is also made longer.

[0061] That is, in the anchor pressure plate assembly for improving frictional force according to the present invention, it is preferable that the number of pressure plates (120) increases as the soil quality of the ground being constructed becomes rougher and the tensile force becomes greater, and that the length of the central column (110) also becomes longer.

[0062] Meanwhile, as illustrated in FIG. 10, the anchor pressure plate assembly for improving frictional force according to the present invention preferably further includes a center holding holder (130) provided in the form of a thin plate at the front and rear of the load-bearing body (20), respectively, into which a steel wire (30) is inserted.

[0063] Accordingly, when the anchor pressure plate assembly for improving frictional force according to the present invention is inserted into the drilled hole (10) to install the steel wire (30), it can be installed more stably at the center position without easily being deflected to one side inside the drilled hole (10) by means of the center maintaining holder (130).

[0064] Although the technical aspects have been described above and attached in the drawings, the technical concept of the present invention is for illustrative purposes only and is not intended to be limited. It will be understood that a person skilled in the art can make various modifications and changes to the technical concept of the present invention within the scope of the technical scope described in the claims below without departing from the technical scope. Explanation of the symbols

[0065] 100: Base pressure plate 101: Sliding slot 105: 1st pressure plate 107: 2nd pressure plate 110: Center column 111: Connecting coupler 113: Fastening member 115: Plate fixing part 120 : Pressure plate 121 : Steel wire insertion slot 123: Guide roller

Claims

Claim 1 An anchor pressure plate assembly used for constructing an earth anchor inserted into a drilled hole (10) in the ground, comprising: a base pressure plate (100) provided at the lower part of a load-bearing body (20) inserted into a drilled hole (10) in the ground, and provided to support a concentrated load applied to the leading edge of the load-bearing body (20) when a steel wire (30) is tensioned; and a central column (110) provided at the upper part of the load-bearing body (20) and provided in the shape of a vertically elongated cylinder. and a plurality of pressure plates (120) are provided at regular intervals along the longitudinal direction of the central column (110), arranged to form a disc-shaped plate structure, and provided to accommodate a steel wire (30) that is wound in a 'U' shape at the front of the load-bearing body (20) and extends to the rear of the load-bearing body (20); wherein the base pressure plate (100) is provided with a diameter 1.19 to 1.47 times larger than the pressure plate (120), and the pressure plates (120) are formed such that as they go downward, the diameter of the lower pressure plate (120) becomes approximately 1.14 to 1.33 times larger than the diameter of the upper pressure plate (120), and the base pressure plate (100) has upper and lower two layers of pressure plates (105, 107) that overlap each other in a sliding manner at the bottom of the load-bearing body (20), and on the plate surface of the pressure plate (120) at the outer circumference An anchor pressure plate assembly for improving friction, characterized in that a plurality of steel wire insertion slots (121) are formed in a mutually symmetrical shape radially toward the center so that a steel wire (30) is inserted into the inner side of the steel wire insertion slots (121). Claim 2 delete Claim 3 delete

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