KR100291848B1 - Apparatus and method for molding anchor bolt hole to concrete structure - Google Patents

Abstract

PURPOSE: An apparatus and method for molding an anchor bolt hole to concrete structure is provided to mold an anchor bolt hole using a removable divided sleeve. CONSTITUTION: The apparatus for molding an anchor bolt hole comprises a plurality of divided sleeves having a same shape to form a cylindrical shape when the sleeves are connected, wherein, an inwardly bent inner contact surface is provided on an end of an outer surface of the sleeve, and spiral rods which are protruded upwardly in different amounts are welded between the respective outer surfaces and the inner contact surfaces; a lower cap(50) having stepped jaw(52) in which lower end of an outer side surface of the divided sleeve is rested, and a connecting hole(56) into which a lower end of a draw rod(54) is connected, wherein, the stepped jaw is formed around the rim of the upper surface, and the connecting hole is provided in the center of the upper surface; and an upper cap(60) having a center hole(62) into which the draw rod is inserted, a plurality of outer holes(64) into which the divided spiral rods are inserted, and groove(66) in which an upper end of the outer side surface is rested.

Description

Method for forming anchor bolt holes in concrete structures and forming mechanism thereof

The present invention relates to a method for forming an anchor bolt hole in a concrete structure, and to a mechanism thereof, and in particular, to form a bridge bearing on a bridge pier, the hole for fixing the anchor bolt is not drilled later by a coring operation. In order to form anchor bolt holes simply by removing the sleeves after the bridge is hardened by injecting concrete while inserting the split type sleeves having a structure that can be easily removed to the outside in the space where the anchor bolt holes are made. It is.

After the non-shrink concrete (5) with the anchor bolt (4) inserted into the anchor bolt hole (3) formed to secure the bridge support (2) on the bridge (1) as shown in FIGS. In order to firmly fix the bridge support (2) by filling a), the anchor bolt hole (3) must first be formed. As the anchor bolt forming method currently used, first, the anchor bolt hole is pierced by a coring machine. There is a method of perforation after birth, and secondly, a concrete pipe is formed by cutting a sleeve made of PVC pipe having a certain diameter into a predetermined length, and then forming a piers, and then removing the slide.

In the method of forming the anchor bolt hole by the coring described above, since the coring machine had to be transported to the pier to drill the hole directly in the field, a skilled technician was required and the assembly and dismantling of the equipment took much time. In addition, the construction cost was quite expensive, there was a problem that the noise and dust generated during the drilling work, the working environment becomes worse, and the structural strength of the bridge was also lowered by damaging the cast iron in the piers during drilling.

On the other hand, it was relatively easy to purchase materials in the method of forming the anchor bolt holes by the latter PVC. However, when the PVC sleeve is removed, the concrete and the sleeve are firmly adhered and the diameter of the hole is small so that the sleeve is completely removed. It was difficult, and if the on-site supervision was not managed thoroughly, the workers had to remove only the upper sleeve and left the lower sleeve intact, which caused the construction work. The old PVC sleeves could not be recycled, causing environmental pollution.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to anchor bolt holes are fitted with anchor bolts for firmly fixing the various members, including bridge bearings on various concrete structures, including bridge piers The present invention provides a method for forming an anchor bolt hole that can be formed in a short time, is more economical than any conventional methods, and is excellent in terms of safety of bridges.

In order to achieve the above object, in one embodiment of the present invention, a split type sleeve that is easy to separate and remove is installed at a predetermined position before molding the concrete structure, and the concrete is poured into the formwork of the structure to cure the structure. Provided are methods and methods for forming anchor bolt holes by dividing the split sleeves out of the structure in sequence and drawing them out.

In another embodiment of the present invention, the division method is different from the above embodiment, the strip-shaped material is wound in a continuous spiral inserting the molded sleeve, and after curing the structure by pouring concrete to pull the top of the sleeve Provided are an anchor bolt hole forming method and a mechanism for allowing the eve to be stripped off as a strip.

1 is a state diagram of the general bridge support.

2 is an enlarged view illustrating main parts of FIG. 1.

3 is an exploded perspective view of the molding apparatus according to the first embodiment of the present invention.

Figure 4 (a) is a cross-sectional view of the installation of the molding apparatus according to the first embodiment of the present invention.

4 (b) is a planar configuration diagram of a molding apparatus according to the first embodiment of the present invention.

5 is a removed state of the molding apparatus according to the first embodiment of the present invention.

6 is an exploded perspective view of a molding apparatus showing a second embodiment of the present invention.

7 (a) is a sectional view of the installation state along the line B-B in FIG.

Figure 7 (b) is a cross-sectional view of the installation state along the line C-C in FIG.

Fig. 7 (c) is a plan view of the molding apparatus showing the second embodiment of the present invention.

8 is a removal state of the molding apparatus according to the second embodiment of the present invention.

9 is an exploded perspective view of the molding apparatus according to the third embodiment of the present invention.

10 is a cross-sectional view of the installation of the molding apparatus according to the third embodiment of the present invention.

11 is a removal state of the molding apparatus according to the third embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: pier 2: bridge bearing

3: anchor bolt hole 4: anchor bolt

5: non-contraction concrete 10, 20, 30, 40: split type sleeve

12,22,32,42: Outer face 14,24,34,44: Inner face

16, 26, 36, 46: spiral bar 18, 28, 38, 48: withdrawal hole

50: lower cap 60: upper cap

100,200: Split type sleeve 300,400: Tapered type sleeve

500: lower cap 600: upper cap

700: spiral sleeve 800: lower cap

900: upper cap C: concrete structure

I: Spacing area

A first embodiment of the present invention is shown in Figs. 3 to 5, which shows an anchor bolt hole forming mechanism composed of a split sleeve and a method of forming an anchor bolt hole by this mechanism.

That is, the present embodiment is divided into four divided sleeves 10, 20, 30, 40 formed to form a cylindrical when coupled, the lower cap 50 and the upper cap coupled to the lower and upper portion of the sleeve It provides a molding mechanism comprising (60).

As shown, the split sleeves 10, 20, 30 and 40 of this embodiment have an internal surface 14 at one end of each of the outer surfaces 12, 22, 32 and 42 of constant curvature. (24) (34) (44) is bent inward at approximately 90 ° angle, and the tip of this inner surface (14) (24) (34) (44) is bent at 90 ° angle again to achieve structural strength. It is formed so that it can be maintained, and between each outer surface 12, 22, 32, 42 and the inner surface 14, 24, 34, 44, spiral rods 16 protruding at different lengths upwards ), 26, 36 and 46 are welded vertically, and the inner contact surfaces 14, 24, 34 and 44 are withdrawn holes 18, 28 and 38 in the upper, middle and lower portions. 48 is perforated.

The outer ends 12, 22, 32, and 42 of the sleeves 10, 20, 30 and 40 are curved surfaces to be easily detached inward in engagement with the other ends of adjacent sleeves, respectively. It is preferable to chamfer the process, thereby facilitating mutual coupling and separation.

The lower cap 50 is preferably made of a rubber or synthetic resin material having flexibility, and the outer sidewalls 12 and 22 of the split type sleeves 10, 20, 30, and 40 on the upper edge side. (32) (42) A step 52 is formed in which a lower end is set, and a coupling ring 56 is formed at the center of the upper surface of the lead rod 54 so as to be connected to the lower end of the U-bolt or the like. The lower cap 50 and the withdrawal rod 54 are interconnected by their rings 58.

The upper cap 60 has a hole 62 through which the lead rod 54 is fitted in the center thereof, and a spiral rod of the split sleeves 10, 20, 30 and 40 on the outside thereof. Four outer holes 64 are drilled so as to fit the 16, 26, 36, and 46, and the outer surface of the divided sleeves 10, 20, 30, and 40 is formed around the lower surface thereof. 12, 22, 32, 42, the upper and the inner side of the groove 66 is fitted to form a bracket (67, 68) corresponding to each other is attached to the inside.

The lower end of the inner contact surfaces 14, 24, 34, 44 of the split sleeves 10, 20, 30, and 40 are cut inclined upwardly inward to prevent contact with the upper surface of the lower cap 50. At the same time to prevent the occurrence of the split type sleeve 10, 20, 30, 40 is not caught.

In the figure, reference numeral "D" denotes a binding means such as a wire, and "N" denotes a nut.

The molding apparatus of this embodiment configured as described above is buried in the concrete structure C as shown in FIGS. 4 (a) and 4 (b), wherein the split sleeves 10, 20, 30 are The outside of the (40) is wound around the binding means (D) such as wires so that the split type sleeves 10, 20, 30, 40 maintain the cylindrical shape, the binding means (D) is a concrete structure (C) four spiral rods 16, 26, 36, 46 protruding to the upper portion of the upper cap 60 in connection with the reinforcing bar (not shown) forming the skeleton of the nut (N) ) To block the flow of concrete into the split type sleeves 10, 20, 30, and 40 when the concrete is poured.

In addition, the split sleeves 10, 20, 30 and 40 are formed longer than the depth of the anchor bolt hole so as to protrude more than the concrete pour surface, and two or four forming mechanisms are provided with a spacing retainer I. Use to connect horizontally and vertically so that the molding gap of anchor bolt hole can be matched.

After pouring concrete and curing is completed after the time elapses, first loosen the nut (N) to separate the upper cap (60), and then remove the split type sleeve (10) (20) (30) (40). At this time, as shown in FIG. 5, the upper part of one of the split sleeves 10 is struck with a hammer (H) to release the state of contact with the concrete, and one end of the lever or lever (not shown) is divided. When inserted into the hole 18 formed in the inner contact surface 14 of the mold sleeve 10 to be flipped inward, the split type sleeve 10, which was circular, is separated and can be easily pulled out. The two split sleeves 20, 30 and 40 can also be easily pulled out in the same way. Finally, the pull rod 54 is pulled out to remove the lower cap 50 so that the anchor bolt holes 3 are formed. It's done.

The split sleeve and the upper and lower caps of this embodiment are also characterized in that they can be used repeatedly.

A second embodiment of the invention is shown in FIGS. 6-8, which is similar to the manner of the first embodiment, but which is a pair of split sleeves 100, 200 having the same shape. ) And a pair of tapered sleeves 300 and 400 which also have the same shape.

As shown, the divided sleeves 100 and 200 of the present embodiment generally have a semi-circular cross-sectional shape, and both sides of the outer surfaces 110 and 210 of the divided sleeves 100 and 200 are inward. The inner contact surfaces 120 and 220 which are bent in parallel are formed, and the spiral rods 130 and 230 are vertically welded between the outer surfaces 110 and 210 and the inner contact surfaces 120 and 220. It protrudes outward from the upper side, and the openings 122 and 222 are drilled in the upper, middle, and lower portions of the inner contact surfaces 120 and 220.

In addition, the tapered sleeves 300 and 400 are in close contact with the boundary formed by the pair of split sleeves 100 and 200, that is, the inner contact surfaces 120 and 220, and the pair of split sleeves 300 and 400. By supporting the sleeve 100 and 200 to form a cylindrical shape and removing it after molding, the pair of split sleeves 100 and 200 are fitted to be easily detached from each other. , Which is vertically formed with the gap maintaining and strength maintaining beads 320 and 420 vertically toward the inner center of the outer surfaces 310 and 410 having a predetermined curvature, and having a spiral bar at the top of the beads 320 and 420. 330 and 430 are welded to protrude outward.

In this embodiment, the structure of the lower cap 500 and the upper cap 600 is similar to that of the first embodiment, and the pair of split sleeves 100 and 200 on the outer side of the lower surface of the upper cap 600. And a pair of tapered sleeves 300 and 400, the engaging jaw 610 to be fitted around the upper end is formed to protrude in a circular shape.

In the drawings, reference numeral 520 denotes a stepped portion, 540 denotes a lead rod, and 560 denotes a ring, and duplicated descriptions of elements identical to or similar to those of the first embodiment of the present invention are avoided.

This embodiment configured as described above is buried in the concrete structure (C), as shown in Figure 7 (a) to 7 (c), wherein the split sleeve (100) 200 and tapered On the lower outer side of the sleeve 300, 400, two pairs of sleeves 100, 200, 300, 400 are wound around the binding means (D) such as wire to maintain the cylindrical shape, the upper cap ( Six spiral rods 130, 230, 330, 430 protruding to the upper portion of the 600 are fastened to the nut (N), respectively, when a pair of sleeves (100, 200, 300) 400) to prevent the inflow of concrete to the inside, using the same gap retaining hole (I) as in the first embodiment to precisely match the molding gap when forming a plurality of anchor bolt holes.

In addition, the two pairs of sleeves 100, 200, 300, 400 are formed longer than the depth of the anchor bolt hole so as to protrude from the concrete pour surface.

After pouring concrete and curing is completed by the time elapses, first unscrew the nut (N) to separate the upper cap 600, and then take out the tapered sleeve 300 on one side, in this case tapered When the upper part of the sleeve 400 is hit by the hammer left or right to release the state in close contact with the concrete and then lifted up, the tapered type sleeve 300 itself has a wider width, and the lower portion is formed in a narrow tapered shape. So easily fall out.

Next, when the tapered sleeve 300 on the opposite side is removed, both split sleeves 100 and 200 are divided with each other, and then blow out appropriately from the outside to the inside using a hammer or the like, and then take out holes 122 and 222. ) And then lift the lever or lever (not shown), such as the tip of the tip and lift it off easily. Finally, the lower cap 500 is pulled out, and the anchor bolt hole 3 is completed.

A third embodiment of the present invention is shown in Figs. 9 to 11, wherein the molding apparatus of this embodiment has a completely different structure from the molding apparatus of the first and second embodiments described above, but can be easily removed. It has a common point in that it has a certain width and a long length of the metal plate, for example, aluminum or stainless thin plate spirally wound in a spiral shape of the cylindrical spiral sleeve 700 made of tubular cut to a constant length Insert the cap 800 together with the concrete structure (C) and cover the upper cap (900) thereon to finish the structure by pouring concrete, and when the structure is cured, hold the tip of the sleeve (700) with tongs, etc. The strip-shaped metal plate 710 of the sleeve 700 which is pulled and wound in a spiral is removed while being unwinded from the top to form the anchor bolt hole 3.

In the anchor bolt hole 3 according to the present embodiment, since the inner wall protrudes in a spiral shape, the coupling area between the non-concrete concrete supporting the anchor bolt hole and the existing concrete of the concrete structure is wide, thereby further improving the bearing force of the anchor bolt. In addition, the continuous band-shaped metal plate 710 after forming the anchor bolt hole is not reusable for anchor bolt hole forming but can be collected and recycled as a useful resource.

On the other hand, in the third embodiment of the present invention, after sealing the lower end of the spiral sleeve with a tape or the like without inserting the lower cap separately, the operation may be made more convenient by removing only the sleeve.

The present invention is inserted into a predetermined position inside the frame of the structure before molding the concrete structure together with the upper and lower caps, as described above, after the concrete is poured and cured, and curing is completed Anchor bolt holes can be easily formed by removing the mold sleeves in turn or by unscrewing the spiral sleeves. The present invention provides a simple method of forming the anchor bolt holes, and the molding time is shorter than that of the conventional method. It can be shortened, and it does not take much manpower and equipment. Therefore, it has economical efficiency to reduce labor costs and various costs. Since there is no sleeve left in the anchor bolt hole as before, The high bond strength between concrete and bridge piers A has a beneficial effect.

Claims (3)

Inner surfaces 14, 24, 34, 44 are bent inwardly at one end of each outer surface 12, 22, 32, 42 having a constant curvature, and each outer surface 12, 22, 32, 42 and A plurality of spiral rods 16, 26, 36, 46 protruding from the inner surfaces 14, 24, 34, 44, each having a different length upward, are formed to have a cylindrical shape when welded to each other to form a cylindrical shape when mutually joined. Split sleeves (10, 20, 30, 40); A step 52 is formed at an upper edge of the split end sleeve 10, 20, 30, and 40, the lower end of which the lower end 12, 22, 32, 42 is settled, and at the center of the upper end of the pullout rod 54. A lower cap 50 having a coupling ring 56 to which the lower ring 58 is coupled; And a hole 62 into which the lead rod 54 is fitted in the center thereof, and the spiral rods 16, 26, 36, 46 of the split type sleeves 10, 20, 30, and 40 are formed outwardly. A plurality of outer holes 64 are drilled to be fitted, and grooves into which the upper ends of the outer surfaces 12, 22, 32, and 42 of the split sleeves 10, 20, 30, and 40 are hooked around the lower surface thereof. Anchor bolt hole forming mechanism, characterized in that it comprises a 66) formed upper cap (60). Internal contact surfaces 120 and 220 which are bent inwardly are formed on both sides of the outer surfaces 110 and 210 having a semi-circular cross-sectional shape, and spiral rods 130 and 230 are vertically welded between the outer surfaces 110 and 210 and the internal contact surfaces 120 and 220. A pair of split sleeves 100 and 200 protruding outwardly; Beads for maintaining gaps and strength to the inner center of the outer surface (110,210) formed in a certain curvature to be in close contact with the inner contact surface (120,220) of the split type sleeve (100,200) to form a cylindrical shape ( 320 and 420 are formed vertically, and a pair of tapered sleeves 300 and 400 welded to protrude to the spiral rods 330 and 430 at the upper ends of the beads 320 and 420; The upper edge is formed with a stepped 520 in which the lower end of the outer side (110,210) of the split type sleeve (100,200) and the tapered sleeve (300,400) is formed, the lower end of the lead rod 540 is coupled to the upper surface A lower cap 500 in which a coupling ring 560 is formed; And a hole into which the lead rod 540 is fitted in the center, and a plurality of outer holes are drilled outwardly so that the spiral rods 330 and 430 of the split type sleeve 100 and 200 are fitted outwardly. Anchor bolt hole forming mechanism, characterized in that it comprises an upper cap (600) formed with a locking jaw (610) to take the upper end of the outer surface (110,210) of the mold sleeve (100,200). The split type sleeve 10, 20, 30, 40 (100, 200, 300, 400) with the upper and lower caps (60, 50) (600, 500) to block the upper and lower inflow of concrete, the predetermined inside of the frame of the structure before molding the concrete structure Installed in the location, and after curing by pouring concrete in the framework of the concrete structure, the split type sleeve (10,20,30,40) (100,200,300,400) is taken out and the lower cap (50) (500) to take out the concrete And forming anchor bolt holes in the structure.