Bolt-assembled strut-tie foundation reinforcement

Abstract

This invention assembles struts, struts and ties, and ties and studs simply by fastening bolts and nuts without welding. The connecting steel plates connecting struts are removed, and the struts, which are unit modular steel plates, are connected with angle connectors or strip-shaped steel plate connectors, and then fastened together with fastening bolts and nuts. This allows the struts to be easily adjusted and assembled on-site in accordance with changes in the size of the columns. The anchoring parts connected to the struts and the ties fixed to both ends of the lower part of the struts are also fixed to the struts by fastening bolts and nuts without welding.

Description

[Technical Field]

[0001] The present invention relates to a bolt-assembled strut-tie foundation reinforcement, and in particular to a strut-to-strut, strut-to-tie, or tie-to-stud assembly that is assembled by fastening a fastening bolt and a fastening nut. [Background technology]

[0002] As buildings become taller, the loads they place on the ground increase, and the size of foundations grows to safely transfer these loads to the ground. The thickness of a foundation to support the load of a building structure is determined by the magnitude of shear force and bending moment. For mat foundations, which are commonly used in high-rise buildings, the thickness of the foundation is determined by the magnitude of shear force. That is, as building structures become taller, the thickness and size of mat foundations, which are reinforced with upper reinforcing bars 10 and lower reinforcing bars 20 to support the structure, also increase. The thickness of mat foundations has gradually increased from 1.0-2.0 meters to 2 meters, 3 meters, and even 5 meters or more. As the thickness and size of mat foundations increase, the load from columns erected on the top of the foundation causes a compressive force to act diagonally from the outer periphery of the columns, as shown in Figure 1(a), resulting in punching shear. This also causes tensile forces that can cause cracks on the underside of the foundation, where the lower reinforcing bars 20 are placed. This has led to a need for reinforcement of the parts of the foundation structure where compressive forces act and where tensile forces act, as shown in Figure 1(c).

[0003] To address the above-mentioned issues, the applicant of the present invention has filed and received registrations for Korean Patent No. 10-0624075, entitled "Foundation Reinforcement Material," and Korean Patent No. 10-2429445, entitled "Crane-Installable Reinforcement Material Integrated with Steel Bars and Its Installation Method." As shown in Figure 2 of Korean Patent No. 10-2429445, the applicant proposed a shear reinforcement structure with a central space and multiple reinforcement plates, with steel ties running along the length of the reinforcement plates and anchoring flanges at both ends. This structure effectively transfers compressive loads from the columns to the ground through the shear reinforcement, improving shear strength in both directions. Furthermore, the ties, which are horizontally arranged steel bars that receive tensile force, efficiently resist the tensile force received by the shear reinforcement, thereby reducing the thickness of the existing foundation.

[0004] However, the reinforcing plate of the above-mentioned prior invention is constructed by welding together a steel plate formed in a wing shape toward the outside of the column with a connecting steel plate C that connects the steel plates to each other around the column, and a steel rod tie installed at the bottom end of the reinforcing body is fixed to the fixing flange by welding. However, this structure requires one or more connecting steel plates C to be applied to each column surface in an overlapping manner depending on the size of the column, and requires the connecting steel plates to be cut, connected, and then welded, which is an inconvenient process. In addition, the above-mentioned prior invention has problems in efficiently applying it as a foundation reinforcement material to changes in column size, such as increasing costs due to the need to install additional connecting steel plates C.

[0005] In addition, in the prior art, steel rods corresponding to ties were welded to the fixing flanges connected to the ends of the shear reinforcement members corresponding to the struts, which resulted in stress loss in the components and ultimately caused the steel rods to become unfixed from the shear reinforcement members. On the other hand, stud bolts were welded to the surface of the reinforcement members, which are compression plates, to prevent slippage, but this also caused the struts, which are compression plates, to become distorted due to uneven welding heat during welding.

[0006] Therefore, there is a need for an assembly-type strut tie foundation reinforcement that maintains the reinforcing principle of conventional strut tie foundation reinforcement, while allowing for economical and quick construction in response to changes in the size of the columns to be installed in the strut tie foundation reinforcement, while reducing the number of components to increase economy, minimizing deformation and distortion of structural components, and simplifying the manufacturing method. Summary of the Invention [Problem to be solved by the invention]

[0007] In view of the above-mentioned problems, the present invention aims to provide a method for connecting struts, which are unit modular steel plates, with angle connectors or steel strip connectors made of angles or steel strips, and then fastening them together with fastening bolts and nuts, instead of removing the connecting steel plates that connect struts separately arranged on the foundation toward the outside of the column surface. This allows the struts, which are compression bodies, to be simply and easily adjusted on site in accordance with changes in the size of the column, reducing the number of assembly parts and simplifying construction without a separate manufacturing or welding process, thereby improving economy in mass production.

[0008] Another object of the present invention is to provide an anchoring portion that is connected to the strut and the tie fixed to both ends of the lower portion of the strut, and that is fixed to the strut by fastening a fastening bolt and a fastening nut without welding, thereby enabling the tie to be connected easily and quickly to the strut.

[0009] Another object of the present invention is to provide a method for fastening a pair of ties to a strut with bolts and nuts at both ends thereof via prefabricated anchoring portions, thereby preventing stress interference between the strut and the ties while maintaining structural performance without weld loss.

[0010] Another object of the present invention is to provide a method for fastening studs to both sides of the strut using double-headed bolts that do not require welding, thereby eliminating the possibility of residual stress or deformation occurring in the studs, which are compression plates, that would otherwise occur when the studs are welded to the strut as in the past. [Means for solving the problem]

[0011] The present invention relates to a bolt-assembled strut-tie foundation reinforcement, a strut-tie reinforcement for a foundation structure that transfers loads from a column to the ground, comprising: a unit strut having two outer upper corners that are horizontal and vertical, and two outer lower corners on the opposite symmetrical side that are also horizontal and vertical, with an upper inclined surface formed between the end of the outer upper horizontal corner and the end of the outer lower vertical corner, and a lower inclined surface formed between the end of the outer upper vertical corner and the end of the outer lower horizontal corner, and an inclined reinforcing plate of a certain width fixed at a right angle to the upper inclined surface and the lower inclined surface; a tie consisting of a pair of reinforcing bars fixed in close contact to both lower surfaces of a pair of unit struts, with the unit struts spaced symmetrically from each other; and a connector that connects the spaced-apart unit struts to each other using angle connectors or strip-shaped steel plate connectors, and then assembled with fastening bolts and fastening nuts to connect the spaced-apart unit struts.

[0012] The unit struts are arranged symmetrically at regular intervals, and other unit struts are arranged symmetrically at regular intervals at right angles to the unit struts, and the unit struts are assembled and connected by connecting parts, so that the overall shape forms a cross (+).

[0013] In addition, two unit struts are positioned parallel to each other with a certain distance between them, and two unit struts are positioned symmetrically thereto; two unit struts are positioned parallel to each other with a certain distance between them and another unit strut at right angles to the unit struts, and two unit struts are positioned symmetrically thereto; and the unit struts are assembled and connected by a connecting part, so that the overall outer shape forms a sharp shape (#).

[0014] In addition, three unit struts are arranged parallel to each other with a certain interval between them, and three unit struts are arranged symmetrically thereto, and three unit struts are arranged parallel to each other with a certain interval between them so as to be perpendicular to the unit struts, and three unit struts are arranged symmetrically thereto, and the unit struts are assembled and connected by connecting parts, so that the overall outer shape is a cross shape ( It is characterized by having the format JPEG2025535264000002.jpg66).

[0015] The tie is a hook-shaped tie with a straight central portion and hook-shaped ends, and the hook-shaped tie fixing portion is formed by the fixed hook portion, and the end of the hook portion of the hook-shaped tie is fixed to the inclined reinforcing plate by welding (W).

[0016] In addition, one or more studs having bolt head-shaped ends are formed on both surfaces of the unit strut, and after forming holes in the unit strut, a double-headed bolt is provided on one surface of the unit strut, with a male thread connecting to the bolt head at the end and the bolt head located on the steel plate surface passing through the hole, and a double-headed bolt is provided on the opposite surface, with a female thread that is fastened to the male thread inside the bolt head at the end and the bolt head located on the steel plate surface, and these are fastened and fixed to both surfaces of the unit strut in close contact with each other to form a stud; or After forming a hole in the unit strut, a fully threaded bolt is inserted into the hole with the same protruding length on both sides of the unit strut, and two nuts are fixed in close contact with both sides of the unit strut, and the two nuts are fixed to the ends of the fully threaded bolt at a certain distance from the unit strut to form a stud, or After forming a hole in the unit strut, a stud is formed by a double-headed bolt provided on one side of the unit strut, with the bolt connecting to the bolt head at the end and the bolt head located on the steel plate surface passing through the hole, a nut provided on the other side of the unit strut and fastened to the bolt so as to be in close contact with the unit strut, and another nut fastened and fixed to the end of the bolt, or by welding a stud bolt with a bolt head to both opposing sides of the stud.

[0017] In addition, both ends of the straight part connected to the hook part of the hook tie are welded (W) to a contact piece having two or more holes, and the contact piece connected to the hook tie is attached to both ends of the steel plate and then fixed with a fastening bolt and a fastening nut.

[0018] The hook ties attached to both sides of the lower part of the steel plate are sandwiched between the U-shaped bolts penetrating the steel plate and the fastening pieces, and then are fastened to the steel plate by fastening the bolt portions of the U-shaped bolts with fastening nuts.

[0019] The straight portions of the hook tie are inserted into the openings of one or more omega (Ω)-shaped fixing clips welded to both sides of the lower part of the steel plate, or the hook tie is tightly attached to both sides of the lower part of the steel plate and fixed by welding (W).

[0020] The tie is a straight tie having bolt portions at both ends, and the bolt portions of the straight tie are " JPEG2025535264000003.jpg1010"-shaped fastener is fastened with a fastening nut after passing through the through hole of the end piece, and is fixed to the steel plate by fastening the fastening bolt and fastening nut that pass through the through hole of the adhesive piece of the fastener.

[0021] The tie is a straight tie having bolt portions at both ends, and the bolt portions of the straight tie are fixed to the " JPEG2025535264000004.jpg1011"-shaped fastener is fastened with a fastening nut after passing through the through hole of the end piece, and is fixed by fastening a fastening bolt and a fastening nut that pass through the through hole of the contact piece of the fastener, and a tie binding part is provided to bind the intersections of the ties, and the tie binding part consists of upper and lower caps located above and below the intersecting ties, a tie receiving groove capable of receiving the tie, and a fastening bolt and a fastening nut that fasten the upper and lower caps, or the tie binding part is characterized in that two U-clips are arranged in parallel on the intersecting ties to enclose the lower tie reinforcing bar, and after the cover piece of the U-clip encloses the upper tie reinforcing bar, it is fastened with a bolt part and a fastening nut formed on the end of the U-clip. [Effects of the Invention]

[0022] The present invention has the effect of simplifying construction without a separate manufacturing or welding process and increasing economy in mass production by easily adjusting and assembling struts, which are unit modular steel plates, on-site according to changes in the size of the columns.

[0023] In addition, the present invention eliminates the struts and connecting steel plates that are separately placed on the foundation toward the outside of the column surface, and integrates angle connecting bases or steel plate connecting bases made of angles or steel plates with fastening bolts and nuts, thereby reducing the number of parts and improving economy, and achieving rapid construction by fastening bolts and nuts without welding.

[0024] In addition, the present invention provides high structural performance by fastening both ends of a pair of ties to the strut with prefabricated fastening parts, and also has the effect of eliminating stress interference between the strut and the tie due to welding, as the ties are fastened with bolts and nuts without welding.

[0025] Furthermore, the present invention has the effect of facilitating assembly by eliminating the possibility of residual stress or deformation in the studs, which are compression plates, that can occur when the studs are welded to the struts as in the past, since the studs are fixed to both sides of the strut using double-headed bolts that do not require welding. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a cross-sectional view showing the state of a typical mat foundation subjected to compressive and tensile forces. [Figure 2] FIG. 1 is a perspective view of a conventional foundation reinforcement material. [Figure 3] 1 is a perspective view of a first embodiment of the present invention; [Figure 4] FIG. 1 is a partially exploded perspective view of a first embodiment of the present invention. [Figure 5] FIG. 1 is a cross-sectional view of a foundation on which a first embodiment of the present invention is installed. [Figure 6] FIG. 10 is a perspective view showing a state in which a steel strip connecting base is connected instead of an angle connecting base in the first embodiment of the present invention. [Figure 7] FIG. 4 is a partially enlarged view of FIG. [Figure 8] FIG. 7 is a partially enlarged view of FIG. [Figure 9] FIG. 10 is a partial perspective view of another tie binding portion in the first embodiment of the present invention. [Figure 10] 4 is a partial view of the hook tie fixing portion in the first embodiment of FIG. 3. [Figure 11] 4 is another view showing the hook tie fixing portion in the first embodiment of FIG. 3. FIG. [Figure 12] 4 is another view showing the hook tie fixing portion in the first embodiment of FIG. 3. FIG. [Figure 13]4 is a view showing yet another embodiment of the hook tie fixing portion in the first embodiment of FIG. 3. FIG. [Figure 14] 4 is a partially exploded perspective view showing a state in which a straight tie fixing portion is attached to the straight tie instead of the hooked tie fixing portion of the first embodiment shown in FIG. 3; [Figure 15] FIG. 15 is a front view of the assembly of FIG. [Figure 16] 4 is an exploded perspective view of another straight tie anchoring portion to which a straight tie is coupled instead of the hooked tie anchoring portion of the first embodiment of FIG. 3. FIG. [Figure 17] (a) to (d) are examples of studs installed on the steel plate of the strut. [Figure 18] This is a second embodiment of the present invention in which the overall external shape is a sharp (#). [Figure 19] This is a third embodiment of the present invention in which the overall external shape is a sharp (#). [Figure 20] This is a fourth embodiment of the present invention in which the overall external shape is a square. [Figure 21] This is a fifth embodiment of the present invention in which the overall external shape is a cross shape. [Figure 22] 1 is a comparison photograph of a conventional foundation reinforcement and a bolt-assembled strut-tie foundation reinforcement of the present invention. [Figure 23] 23 is a table showing the results of a stress experiment on the foundation reinforcement member of FIG. 22. [Figure 24] Same as above. DETAILED DESCRIPTION OF THE INVENTION

[0027] The present invention will now be described in detail with reference to the accompanying drawings.

[0028] Fig. 3 is a perspective view of a first embodiment of the present invention, Fig. 4 is a partially exploded perspective view of the first embodiment of the present invention, and Fig. 5 is a cross-sectional view of a foundation on which the first embodiment of the present invention has been installed. Compared to conventional foundation reinforcement materials, the present invention uses bolt and nut fastening methods to connect each component, simplifying assembly regardless of changes in column size and speeding up construction. Eliminating the connecting steel plate C reduces the number of components, improving economy and stress efficiency. Furthermore, the strut 100 structure is standardized into unit modules, improving economy in mass production. The ties 200 are fastened using simple bolt and nut fastening methods rather than welding, and the studs 500 have a double-headed bolt structure but are fastened using bolts rather than welding.

[0029] In the present invention, as shown in FIG. 5, a unit strut 100 constituting a strut-tie reinforcement of a foundation structure that transfers load from a column 40 to the ground is composed of unit modules to be connected with bolts, and comprises a hexagonal steel plate 110 having two outer corners on its upper side that are horizontal and vertical, two outer corners on its lower side that are also horizontal and vertical, an upper inclined surface 110a formed between the end of the outer horizontal corner on the upper side and the end of the outer vertical corner on the lower side, and a lower inclined surface 110b formed between the end of the outer vertical corner on the upper side and the end of the outer horizontal corner on the lower side, and an inclined reinforcing plate 120 of a certain width fixed at a right angle to the upper inclined surface 110a and the lower inclined surface 110b.

[0030] In addition, in the present invention, the tie 200 is composed of a pair of reinforcing bars that are closely fixed to both lower surfaces of a pair of unit struts 100, with the unit struts 100 spaced apart so as to be symmetrical to each other, and the connecting part 300 connects the spaced-apart unit struts 100 to each other, as shown in Figures 7 and 8, by fastening the unit struts 100 to each other using angle connecting bases 310 or strip-shaped steel plate connecting bases 320 with fastening bolts 100a and fastening nuts 100b, and the connecting part 300 is assembled with fastening bolts 310a, 320a and fastening nuts 310b, 320b. That is, the angle connecting members 310 are fastened and fixed at their intersections with fastening bolts 310a and fastening nuts 310b, or the steel strip connecting members 320 are fastened and fixed at their intersections with fastening bolts 320a, fastening nuts 320b, and JPEG2025535264000005.jpg1011"-shaped fixing base 321, and the unit struts 100 are connected to each other with angle connecting bases 310 or steel strip connecting bases 320 and are connected and assembled by fastening bolts and nuts. Therefore, the unit struts 100 can be easily adjusted and assembled on site according to changes in the size of the column 40, which simplifies construction without requiring a separate manufacturing process or welding process and also has the effect of increasing economy in mass production.

[0031] 3 to 5 show that unit struts 100 and 100 are symmetrically positioned at regular intervals, and another unit strut 100 and another unit strut 100 are symmetrically positioned at regular intervals at right angles to the unit struts 100, and the unit struts 100 and 100 are assembled and connected by connecting parts 300, so that the overall shape forms a cross (+). The tie 200 has a straight part 211 extending straight in the center and hook-shaped ( The hook tie 210 is a hook part 212 of JPEG2025535264000006.jpg57), and the hook tie fixing part 600 is formed by the hook part 212 to be fixed. The hook portion 212 of the 180° bent standard hook shown in the figure of the present invention has the effect of increasing stress by improving the anchoring ability by bonding with the concrete to be poured, and the hook portion 212 is a standard hook of the building structure standard that specifies the anchoring length and shape of the reinforcing bar that receives tensile force. JPEG2025535264000008.jpg57), and the standard hook of the building construction standard (not shown in the drawings) formed as a standard hook bent by 90°. JPEG2025535264000009.jpg79), but this is determined by the site conditions where the hook tie 210 is to be applied.

[0032] FIG. 6 is a perspective view of a steel strip connector 320 connected to the first embodiment of the present invention, in place of the angle connector 320. JPEG2025535264000010.jpg1011"-shaped fixing base 321 is placed on the unit struts 100 and fastened with fastening bolts 320a and fastening nuts 320b, thereby making the connection between the unit struts 100 stronger.

[0033] Fig. 7 is a partial enlarged view of Fig. 3, Fig. 8 is a partial enlarged view of Fig. 6, and Fig. 9 is a partial perspective view of another tie binding part according to the first embodiment of the present invention. In Fig. 7, unit struts 100 are connected to each other by angle connectors 310 of connecting part 300, and unit struts 100 and angle connectors 310 are connected by fastening bolts 100a and fastening nuts 100b, and angle connectors 310 and angle connectors 310 are fixed by fastening bolts 310a and fastening nuts 310b. Tie binding part 400, which binds the intersections of ties 200, is composed of upper and lower caps 410 and 420 located above and below the intersecting ties 200, tie receiving grooves 430 capable of receiving ties 200, and fastening bolts 440a and fastening nuts 440b that fasten the upper and lower caps 410 and 420. In FIG. 8, as shown in FIG. 6, the belt-shaped iron plate connecting base 320 and " JPEG2025535264000011.jpg1011"-shaped fixing base 321 is fastened with fastening bolts 320a and fastening nuts 320b, and upper cap 410 and lower cap 420 located above and below tie 200 intersecting at tie binding portion 400 are formed with tie receiving grooves 430 capable of receiving tie 200, so that tie 200 is more firmly fixed when upper cap 410 and lower cap 420 are fastened with fastening bolts 440a and fastening nuts 440b.

[0034] FIG. 9 shows a tie binding part 400 in which two U-clips 450 are arranged in parallel around intersecting ties 200 to enclose the lower tie rebar, and the cover piece 460 of the U-clip 450 encloses the upper tie rebar, and then the U-clip 450 is fastened and fixed with a bolt portion 450a and a fastening nut 450b formed at the end of the U-clip 450. After arranging a pair of U-clips 450 in parallel, they are fitted into the tie 200 located below, and the cover piece 460 is placed on the tie 200 located above, with the cover piece 460 perpendicular to the parallel U-clips 450. Then, the fastening nut 450b is connected to the bolt portion 450a formed at the end of the U-clip 450 to fasten and fix, thereby more firmly fixing the intersection of the ties 200.

[0035] 10 is a partial view of the hook-shaped tie fixing portion in the first embodiment of FIG. 3, FIG. 11 is another embodiment view of the hook-shaped tie fixing portion in the first embodiment of FIG. 3, FIG. 12 is another embodiment view of the hook-shaped tie fixing portion in the first embodiment of FIG. 3, and FIG. 13 is another embodiment view of the hook-shaped tie fixing portion in the first embodiment of FIG. 3.

[0036] In the present invention, the ends 212a of the hook portions 212 of the hook tie 210 are fixed to the inclined reinforcing plate 120 by welding (W), which prevents loose movement during concrete pouring due to the integration of the hook tie 210 and the unit strut 100, resulting in stable construction. In Fig. 10, both ends of the straight portion 211 connected to the hook portion 212 of the hook tie 210 are welded (W) to a contact piece 610 with two or more holes. The contact piece 610 connected to the hook tie 210 is then attached to both ends of the steel plate 110 and fixed with fastening bolts 611a and fastening nuts 611b. Since both ends of the straight portion 211 of the hook tie 210 are welded (W) to the contact piece 610, this has the effect of speeding up construction when assembling and completing the present invention. 11, which allows for rapid installation, the hook tie 210, which is tightly attached to both lower surfaces of the steel plate 110, is sandwiched between a U-shaped bolt 620 penetrating the steel plate 110 and a fastening piece 621, and then is tightly fixed to the steel plate 110 by fastening a bolt portion 620a of the U-shaped bolt 620 to a fastening nut 620b. In FIG. 12, the hook tie 210 is easily installed by being pressed into an inlet 631 of one or more omega (Ω)-shaped fastening clips 630 welded to both lower surfaces of the steel plate 110, thereby facilitating rapid installation at the assembly site. In FIG. 13, the hook tie 210 is tightly attached to both lower surfaces of the steel plate 110 and fastened by welding (W), which reduces the amount of materials used for fastening and thus reduces costs.

[0037] Figure 14 is a partially exploded perspective view of a straight tie fixing portion that is connected to a straight tie instead of the hook-shaped tie fixing portion of the first embodiment of Figure 3, Figure 15 is a front view of the connection of Figure 14, and Figure 16 is an exploded perspective view of another straight tie fixing portion that is connected to a straight tie instead of the hook-shaped tie fixing portion of the first embodiment of Figure 3.

[0038] 14 and 15 show a straight tie 220 having bolt portions 220a at both ends, and the bolt portions 220a of the straight tie 220 are connected to the " 16 shows a straight tie 220 in which the tie 200 is straight and has bolt portions 220a at both ends, and the bolt portions 220a of the straight tie 220 are fastened to the iron plate 110 by fastening the fastening bolt 715a and the fastening nut 715b, which pass through the through hole 714 of the end piece 711 of the "1010"-shaped fixing device 710, and then pass through the through hole 713 of the contact piece 712 of the fixing device 710. JPEG2025535264000013.jpg1011 After passing through the through hole 724 of the end piece 721 of the "-shaped fastener 720, it is fastened with a fastening nut 220b, and is fixed by fastening a fastening bolt 725a passing through the through hole 723 of the contact piece 722 of the fastener 720 and fastening a fastening nut 725b. Since the entire structure is assembled with bolts and nuts, not only can construction be performed quickly, but welding is omitted in the connection of components, thereby reducing stress loss due to welding. The connection structure between the tie 200 and the tie fixing part 700 can be changed to various structures other than the embodiment described above as long as stress loss is not lost.

[0039] Figures 17(a) to (d) show embodiments of studs that are installed on the steel plate of a strut, characterized in that one or more studs 500 having an end shaped like a bolt head are formed on both surfaces of a unit strut 100.

[0040] In the first embodiment of Figure 17(a), after a hole is formed in a unit strut 100, a double-head bolt 510 is provided on one side of the unit strut 100 and configured so that a male screw 510c connected to a bolt head 510a at the end and a bolt head 510b located on the surface of the steel plate 110 passes through the hole, and a double-head bolt 511 is provided on the opposite side and configured so that a bolt head 511a at the end and a female screw 511c inside the bolt head 511b located on the surface of the steel plate 110 fasten with the male screw 510c are fastened to both sides of the unit strut 100 in close contact with each other, thereby forming a stud 500.

[0041] In the second embodiment of Figure 17(b), after a hole is formed in a unit strut 100, a fully threaded bolt 520 is inserted into the hole with the same protruding length on both sides of the unit strut 100, and two nuts 521 are tightly attached to both sides of the unit strut 100 and fixed thereto, and the two nuts 521 are fixed to the ends of the fully threaded bolt 520 at a certain distance from the unit strut 100, thereby forming a stud 500.

[0042] In the third embodiment of Figure 17(c), after a hole is formed in a unit strut 100, a double-headed bolt 530 is provided on one side of the unit strut 100 and configured so that a bolt 530c connected to a bolt head 530a at the end and a bolt head 530b located on the surface of the steel plate 110 passes through the hole, a nut 531 is provided on the other side of the unit strut and fastened to the bolt 530c to be in close contact with the unit strut 100, and another nut 531 fastened and fixed to the end of the bolt 530c. In Figures 17(a) to (c), a double-head bolt 510, 530 or a fully threaded bolt 520 is passed through a hole formed in the unit strut 100, and then the stud 500 is formed by quickly and easily fastening a double-head bolt 511 having an internal thread 511c or nuts 521, 531. In contrast, in the fourth embodiment of Figure 17(d), the stud 500 is formed by welding stud bolts 540 having bolt heads 540a to both opposing sides of the stud 500, and instead of forming a hole in the unit strut 100, the stud bolts 540 having bolt heads 540a are welded.

[0043] FIG. 18 shows a second embodiment of the present invention in which the overall outer shape is a sharp (#), and FIG. 19 shows a third embodiment of the present invention in which the overall outer shape is a sharp (#).

[0044] 18 and 19, two unit struts 100 are positioned parallel to each other with a certain distance between them, and two unit struts 100 are positioned symmetrically thereto, and two unit struts 100 are positioned parallel to each other with a certain distance between them so that they are perpendicular to the unit struts 100, and two unit struts 100 are positioned symmetrically thereto, and the unit struts 100 are assembled and connected by connecting parts 300, so that the overall outline forms a sharp shape (#). In the second embodiment of Figure 18, unit struts 100 that are spaced apart are connected to each other using a steel strip connecting base 320. In contrast, in the third embodiment of Figure 19, the steel strip connecting base 320 of the connecting part 300 is made of steel plates of a certain width connected together, giving it an overall square-shaped outline, and the steel plate 110 and the steel strip connecting base 320 are fastened together by fastening them with fastening bolts and fastening nuts to an angle-shaped connecting fixing base 340 that is in close contact with the corner where the steel plate 110 and the steel strip connecting base 320 meet, and a steel strip support base 330 is installed at the corner where the steel strip connecting base 320 and the steel strip connecting base 320 meet.

[0045] The second and third embodiments of the present invention, as well as the fourth and fifth embodiments described below, use different numbers of unit struts 100. However, the magnitude of the load transmitted by the foundation varies depending on the number of unit struts 100 applied. Therefore, the structural performance of the unit struts 100 can be qualitatively evaluated to determine the optimal number and shape of unit struts depending on the magnitude of the upper load.

[0046] 20 and 21 show the overall outer shape of the present invention. 20 and 21, three unit struts 100 are arranged parallel to each other at regular intervals, and three unit struts 100 are arranged symmetrically thereto, and three unit struts 100 are arranged parallel to each other at regular intervals, and three unit struts 100 are arranged symmetrically thereto, and three unit struts 100 are arranged parallel to each other at regular intervals, and three unit struts 100 are arranged symmetrically thereto, and the unit struts 100 are assembled and connected by connecting parts 300, so that the overall outer shape is a cross shape ( JPEG2025535264000015.jpg66) are the same.

[0047] In the fourth embodiment of Figure 20, as in the third embodiment, the steel strip connection base 320 of the connection portion 300 is connected to steel plates of a certain width, forming an overall square shape, and the steel plate 110 and the steel strip connection base 320 are fastened together by fastening them with fastening bolts and fastening nuts to an angle-shaped connection fixing base 340 that is in close contact with the corner where the steel plate 110 and the steel strip connection base 320 meet, and a steel strip support base 330 is installed at the corner where the steel strip connection base 320 and the steel strip connection base 320 meet. In the fifth embodiment of Figure 21, unit struts 100, unit struts 100, and steel strip connection bases 320 are connected and fixed by the connection fixing base 340.

[0048] Although the first to fifth embodiments of the bolt-assembled strut-tie foundation reinforcement of the present invention have been described, in addition to the above embodiments, various modifications and variations can be made by changing the arrangement and connection of the unit struts 100.

[0049] Figure 22 shows actual photographs comparing a conventional foundation reinforcement and a bolt-assembled strut-tie foundation reinforcement of the present invention, which were fabricated for a loading test using a test specimen. Figures 23 and 24 are tables showing the results of a performance evaluation test of a foundation using a bolt-assembled strut-tie foundation reinforcement, conducted by the Sungkyunkwan University Industry-Academia Collaboration Group to verify the field applicability and safety of the present invention. The top and bottom photographs on the left side of Figure 22 show the conventional cross-shaped (+) and conventional sharp-shaped (#) strut-tie foundation reinforcements. These consist of a strut-type steel plate with a wing-like shape extending outward from the column to be installed, and a connecting steel plate C that connects the two steel plates around the column, welded together. The steel tie rod is welded to the fixing flange. However, as mentioned above, this structure requires one or more connecting steel plates C to be applied to each column surface, overlapping each other depending on the column size, and requires the complicated process of cutting or connecting the connecting steel plates C and then welding them.

[0050] In the first and second embodiments of the present invention, shown in the upper and lower photographs on the right side of Figure 22, unit struts 100 are connected to one another using angle connector 310, fastening bolt 100a, and fastening nut 100b, and then fastening bolts 310a, 320a, and fastening nuts 310b, 320b form connecting portion 300. Tie 200 is a hook tie 210 with a straight portion 211 extending straight in the center and hook-shaped portions 212 at both ends, and hook tie fastening portion 600 is formed by the fastened hook portions 212. This maintains the reinforcing principle of conventional strut-tie foundation reinforcement, allowing for rapid construction in response to changes in the size of the columns to be installed in the strut-tie foundation reinforcement, and improving economy by reducing the number of components and modularizing units. It also minimizes deformation or distortion of structural members and simplifies the manufacturing method, making construction quick and easy while improving the efficiency of member stress.

[0051] Figure 23 shows the results of load tests conducted on a conventional unreinforced foundation reinforcement, conventional cross-shaped (+) and conventional sharp-shaped (#) strut-tie foundation reinforcement, and the first and second embodiments of the present invention.The maximum strength of 2330 (KN), which is the experimental result value of the conventional unreinforced foundation reinforcement, was set as 100%, which is the reference value, and the maximum strengths of the other test bodies were set as relative ratios (%) compared to this. As a result, the maximum strength of the first embodiment of the present invention is 3466 KN, or 149% of the maximum strength of the conventional cross-shaped (+) strut-tie foundation reinforcement, which is 3225 KN, or 138% of the conventional strength. The maximum strength of the second embodiment of the present invention is 4124 KN, or 177% of the maximum strength of the conventional sharp-shaped (#) strut-tie foundation reinforcement, which is 4029 KN, or 173% of the conventional strength. As can be seen, the first and second embodiments of the present invention offer superior manufacturability, ease of construction, and cost-effectiveness compared to the conventional cross-shaped (+) and sharp-shaped (#) strut-tie foundation reinforcements, while also improving stress efficiency. This can be confirmed from the load-displacement test results table of foundation reinforcement in Figure 24.

[0052] As described above, the present invention simplifies construction and improves economy in mass production by simply and easily adjusting and assembling unit struts 100, which are unit modular steel plates, on site according to changes in the size of the column, without requiring a separate manufacturing or welding process. Furthermore, the connecting steel plate C connecting the unit struts 100, which are separately arranged on the base toward the outside of the column surface, is eliminated, and the unit struts 100 are integrated with the angle connecting base 310 or the steel strip connecting base 320, which are made of an angle or a steel strip, by fastening the fastening bolts 100a and fastening nuts 100b, thereby reducing the number of parts and improving economy. In addition, fastening bolts and nuts allow for quick construction without welding, and both ends of a pair of ties 200 are fixed to the unit strut 100 at pre-fabricated anchor points, thereby achieving high structural performance. However, since the ties are fastened with bolts and nuts without welding, stress interference between the unit strut 100 and the tie 200 caused by welding is eliminated. The studs 500 fixed to both sides of the unit strut 100 are formed with double-headed bolts that do not require welding, which eliminates the possibility of residual stress or deformation in the studs 500, which are compression plates that occur when the studs 500 are welded to the strut 100 as in the conventional method, and facilitates assembly.

[0053] As described above, the present invention has been described using limited embodiments and drawings, but the terms and words used in the specification and claims should not be interpreted in a limited manner based on their ordinary or dictionary meanings, but should be interpreted in a manner consistent with the technical spirit of the present invention. Therefore, the embodiments described in the specification and the configurations shown in the drawings are merely one embodiment of the present invention and do not represent the entire technical spirit of the present invention, and therefore it should be understood that various equivalents and modifications may exist without departing from the scope of the claims of the present invention.

Claims

1. In strut-tie reinforcement of foundation structures that transfer loads from columns to the ground, a hexagonal iron plate (110) having two outer corners on its upper side that are horizontal and vertical, and two outer corners on its symmetrical opposite side that are also horizontal and vertical, with an upper inclined surface (110a) formed between the end of the horizontal corner on the upper side and the end of the vertical corner on the lower side, and a lower inclined surface (110b) formed between the end of the vertical corner on the upper side and the end of the horizontal corner on the lower side; and a unit strut (100) having an inclined reinforcing plate (120) of a certain width fixed at a right angle to the upper inclined surface (110a) and the lower inclined surface (110b); The unit struts (100) are spaced symmetrically from each other, and a tie (200) consisting of a pair of reinforcing bars is tightly fixed to both lower surfaces of the pair of unit struts (100); and A bolt-assembled strut-tie foundation reinforcement, characterized in that it comprises: a connecting portion (300) that connects the unit struts (100) to each other with angle connecting blocks (310) or steel strip connecting blocks (320) for connecting the spaced apart unit struts (100) and that is assembled with fastening bolts (310a, 320a) and fastening nuts (310b, 320b).

2. 2. The bolt-assembled strut-tie foundation reinforcement according to claim 1, wherein the unit struts (100) are symmetrically positioned at regular intervals, and another unit strut (100) is symmetrically positioned at regular intervals at right angles thereto, and the unit struts (100) are assembled and connected by connecting parts (300) so that the overall external shape forms a cross (+).

3. 2. The bolt-assembled strut-tie foundation reinforcement according to claim 1, wherein the unit strut (100) and the unit strut (100) are arranged in parallel with a certain distance between them, and two other unit struts (100) are arranged symmetrically thereto, and two other unit struts (100) are arranged in parallel with another unit strut (100) arranged in parallel with a certain distance between them so as to be perpendicular to the unit strut (100), and two other unit struts (100) are arranged symmetrically thereto, and the unit struts (100) and the unit struts (100) are assembled and connected by connecting parts (300), so that the overall external shape is a sharp shape (#).

4. The unit struts (100) are arranged in parallel with each other at regular intervals, and three unit struts (100) are arranged symmetrically thereto. Three unit struts (100) are arranged in parallel with each other at regular intervals, and three unit struts (100) are arranged symmetrically thereto. The unit struts (100) are arranged in parallel with each other at regular intervals, and three unit struts (100) are arranged symmetrically thereto. The unit struts (100) are assembled and connected by connecting parts (300), and the overall external shape is a cross shape ( 2. The bolt-assembled strut-tie foundation reinforcement according to claim 1, wherein the bolt-assembled strut-tie foundation reinforcement is

5. The bolt-assembled strut-tie foundation reinforcement according to any one of claims 1 to 4, characterized in that the tie (200) is a hook-shaped tie (210) having a straight portion (211) extending straight in the center and hook-shaped portions (212) at both ends, and the hook-shaped tie fixing portion (600) is formed by the hook portion (212) to be fixed.

6. The bolt-assembled strut-tie foundation reinforcement according to claim 5, wherein the end (212a) of the hook portion (212) of the hook-shaped tie (210) is fixed to the inclined reinforcing plate (120) by welding (W).

7. The bolt-assembled strut-tie foundation reinforcement according to any one of claims 1 to 4, characterized in that one or more studs (500) having an end portion shaped like a bolt head are formed on both surfaces of the unit strut (100).

8. 10. The bolt-assembled strut-tie foundation reinforcement of claim 7, wherein a hole is formed in the unit strut (100), and then a double-head bolt (510) is provided on one side of the unit strut (100) and configured so that a male thread (510c) connecting to a bolt head (510a) at the end and a bolt head (510b) located on the steel plate (110) surface passes through the hole, and a double-head bolt (511) is provided on the opposite side and configured so that a female thread (511c) is fastened to the male thread (510c) inside the bolt head (511a) at the end and the bolt head (511b) located on the steel plate (110) surface, and is tightly fastened to both sides of the unit strut (100) to form a stud (500).

9. 8. The bolt-assembled strut-tie foundation reinforcement of claim 7, wherein a hole is formed in the unit strut (100), and then a fully threaded bolt (520) is inserted into the hole with the same protruding length on both sides of the unit strut (100), and two nuts (521) are closely attached to both sides of the unit strut (100) and fixed to the ends of the fully threaded bolt (520) at a predetermined distance from the unit strut (100), thereby forming a stud (500).

10. 8. The bolt-assembled strut-tie foundation reinforcement according to claim 7, wherein a stud is formed by forming a hole in the unit strut (100), and then providing a double-headed bolt (530) on one side of the unit strut (100) with a bolt (530c) that connects to a bolt head (530a) at the end and a bolt head (530b) located on the steel plate (110) surface and passes through the hole; a nut (531) provided on the other side of the unit strut and fastened to the bolt (530c) to closely contact the unit strut (100); and another nut (531) fastened and fixed to the end of the bolt (530c).

11. 8. The bolt-assembled strut-tie foundation reinforcement according to claim 7, wherein the stud (500) is formed by welding stud bolts (540) having bolt heads (540a) to both opposing sides of the stud (500).

12. 6. The bolt-assembled strut-tie foundation reinforcement according to claim 5, wherein both ends of the straight portion (211) connected to the hook portion (212) of the hook tie (210) are welded (W) to a contact piece (610) having two or more holes, and the contact piece (610) connected to the hook tie (210) is tightly attached to both ends of the steel plate (110) and then fixed with a fastening bolt (611a) and a fastening nut (611b).

13. The bolt-assembled strut-tie foundation reinforcement of claim 5, characterized in that the hook ties (210) attached to both lower surfaces of the steel plate (110) are sandwiched between a U-shaped bolt (620) penetrating the steel plate (110) and a fastening piece (621), and then are tightly fixed to the steel plate (110) by fastening the bolt portion (620a) of the U-shaped bolt (620) to a fastening nut (620b).

14. 6. The bolt-assembled strut-tie foundation reinforcement according to claim 5, wherein the straight portions (211) of the hook-shaped ties (210) are pressed into the inlets (631) of one or more omega-shaped fixing clips (630) fixed by welding to both sides of the lower part of the steel plate (110).

15. The bolt-assembled strut-tie foundation reinforcement according to claim 5, wherein the hook ties (210) are fixed to both sides of the lower part of the steel plate (110) by welding (W).

16. The tie (200) is a straight tie (220) having bolt portions (220a) at both ends, and the bolt portions (220a) of the straight tie (220) are fixed to the " The bolt-assembled strut-tie foundation reinforcement according to any one of claims 1 to 4, characterized in that the bolt-assembled strut-tie foundation reinforcement is fastened with a fastening nut (220b) after passing through a through hole (714) of the end piece (711) of the "-shaped fixing device (710), and is fixed to the steel plate (110) by fastening a fastening bolt (715a) that passes through a through hole (713) of the contact piece (712) of the fixing device (710) and a fastening nut (715b).

17. The tie (200) is a straight tie (220) having bolt portions (220a) at both ends, and the bolt portions (220a) of the straight tie (220) are fixed to the opposing " The bolt-assembled strut-tie foundation reinforcement according to any one of claims 1 to 4, characterized in that the bolt-assembled strut-tie foundation reinforcement is fastened with a fastening nut (220b) after passing through a through hole (724) of the end piece (721) of the "-shaped fixing device (720), and is fixed by fastening a fastening bolt (725a) passing through a through hole (723) of the contact piece (722) of the fixing device (720) and a fastening nut (725b).

18. The bolt-assembled strut-tie foundation reinforcement according to any one of claims 1 to 4, characterized in that a tie binding portion (400) is installed to bind the intersections of the ties (200) with each other.

19. 19. The bolt-assembled strut-tie foundation reinforcement of claim 18, wherein the tie binding part (400) comprises an upper cap (410) and a lower cap (420) located above and below the crossing ties (200), a tie receiving groove (430) capable of receiving the ties (200), and a fastening bolt (440a) and a fastening nut (440b) for fastening the upper cap (410) and the lower cap (420).

20. The bolt-assembled strut-tie foundation reinforcement of claim 18, characterized in that the tie binding part (400) is formed by arranging two U-clips (450) in parallel around the crossing ties (200) to enclose the lower tie reinforcing bar, and the cover piece (460) of the U-clip (450) encloses the upper tie reinforcing bar, and then fastened and fixed with a bolt part (450a) and a fastening nut (450b) formed at the end of the U-clip (450).

21. 2. The bolt-assembled strut-tie foundation reinforcement according to claim 1, wherein the angle connecting blocks (310) are fastened and fixed at their intersections with fastening bolts (310a) and fastening nuts (310b).

22. The steel strip connecting bases (320) are connected to each other at the intersections.

2. The bolt-assembled strut-tie foundation reinforcement according to claim 1, characterized in that it is fastened and fixed by fastening bolts (320a) and fastening nuts (320b) by applying a "-shaped fixing base (321).

23. The bolt-assembled strut-tie foundation reinforcement of claim 3 or 4, characterized in that the steel strip connection base (320) of the connection part (300) is formed by connecting steel plates of a certain width to form an overall square shape, and the steel plate (110) and the steel strip connection base (320) are fastened together by fastening them with fastening bolts and fastening nuts to an angle-shaped connection fixing base (340) that is in close contact with the corner where the steel plate (110) and the steel strip connection base (320) meet.

24. 24. The bolt-assembled strut-tie foundation reinforcement according to claim 23, characterized in that a steel strip support base (330) is provided at the corner where the steel strip connection base (320) and the steel strip connection base (320) meet.

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