Anchor driving jig

Abstract

This invention provides an anchor driving jig for stably driving anchors to the appropriate depth. [Solution] The anchor driving jig 10, which drives an internal cone-driven anchor with a driving length of T1 into a core hole T2 that is deeper than T1, has a hollow bolt 101 with a central axis length of T2-T1 or greater, in which a driving rod 103 for pressing the internal cone of the anchor is slidably housed in the hollow part. A screw 104 for screwing into the anchor is threaded on the outer circumference of one end of the hollow bolt 101. A flange 102 with an outer diameter larger than the outer diameter of the core hole is provided on the other end of the hollow bolt 101.

Description

Technical Field

[0001] The present invention relates to an anchor driving jig that is detachably loaded onto an anchor driving machine such as a portable hydraulic processing machine that moves a piston by supplying pressurized oil, for example.

Background Art

[0002] An anchor is embedded with a part protruding from the concrete surface, and a structure is fixed using the embedded anchor. This type of anchor is mainly made of metal and is also called an anchor bolt because a screw is provided at the end on the protruding side (protruding end).

[0003] An internal cone driving type anchor is composed of a hollow body with a central hole, and the end on the embedding side (embedding end) is a diameter-expanded part with slits, and an internal cone is inserted into the central hole. The anchor is inserted into a hole drilled in the concrete surface from the embedding end, and by moving the internal cone to expand the diameter-expanded part, a frictional force is secured between the anchor and the wall surface of the hole, and the anchor is fixed so as not to be pulled out. Regarding this type of technology, Patent Document 1 discloses an anchor positioning jig that guarantees uniform driving of the anchor.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When an exterior covering such as mortar or tiles is attached to a concrete surface, the anchor positioning jig disclosed in, for example, Patent Document 1 may not drive the anchor to a sufficient depth in the concrete. This is because the length of the anchor driven into the concrete (driving length) is shorter by the thickness of the exterior covering compared to when the anchor is driven directly into the concrete. If the anchor is not driven into the concrete deeply enough, the expanding portion will not expand sufficiently, and the necessary frictional force cannot be secured between the expanding portion and the wall of the drilled hole. Therefore, a jig is needed to drive the anchor to the appropriate depth stably. [Means for solving the problem]

[0006] The anchor driving jig of the present invention is a jig for driving an internal cone-driven anchor with a driving length of T1 into a core hole T2 which is deeper than T1, and has a hollow bolt with a central axis length of T2-T1 or more, in which a driving rod for pressing the internal cone of the anchor is slidably housed in the hollow part, a screw thread for screwing into the anchor is threaded on the outer circumference of one end of the hollow bolt, and a flange with an outer diameter larger than the outer diameter of the core hole is provided on the other end of the hollow bolt. [Effects of the Invention]

[0007] According to the present invention, it is possible to drive anchors stably to the appropriate depth. [Brief explanation of the drawing]

[0008] [Figure 1] (a) to (c) are diagrams showing the configuration of the anchor driving jig. [Figure 2] (a) and (b) are diagrams showing the configuration of an anchor driving jig with the driving rods inserted. [Figure 3] (a) and (b) are diagrams showing the configuration of the anchor. [Figure 4] (a) and (b) are diagrams showing the configuration of the anchor with the enlarged diameter section expanded. [Figure 5] (a) and (b) are diagrams illustrating the state in which the anchor is attached to the anchor driving jig. [Figure 6] (a) and (b) are diagrams illustrating the state in which the anchor is attached to the anchor driving jig and the driving rod has been driven in. [Figure 7] (a) and (b) are diagrams illustrating how anchors are embedded in concrete. [Figure 8] (a) and (b) are diagrams illustrating the appearance of the anchor after it has been driven into the concrete. [Figure 9] (a) and (b) are diagrams illustrating how anchors are embedded in concrete when the thickness of the exterior is different. [Figure 10] An explanatory diagram of an anchor driving jig with a variable length hollow bolt. [Figure 11] (a) and (b) are diagrams showing the configuration of an anchor driving jig in which a hollow bolt is composed of multiple hollow members. [Figure 12] An explanatory diagram of the driving rod. [Modes for carrying out the invention]

[0009] Preferred embodiments of the present invention will be described below with reference to the attached drawings. Figure 1 is a diagram showing the configuration of the anchor driving jig of this embodiment. Figure 1(a) is an external view of the anchor driving jig 10, and Figure 1(b) is a cross-sectional view of the anchor driving jig 10 at point BB. The anchor driving jig 10 includes a hollow bolt 101 having a central hole (hollow portion). A driving rod 103 for pressing the internal cone of the anchor, which will be described later, is slidably housed in the hollow portion of the hollow bolt 101. The hollow bolt 101 has a screw 104 threaded on the outer circumference of one end into which the anchor is screwed, and a flange 102 is provided on the other end.

[0010] In this example, the driving rod 103 consists of a stud rod 103a and a flat-head rod 103b. The stud rod 103a presses against the internal cone of the anchor with its tip. The tip of the flat-head rod 103b contacts the stud rod 103a, and the striking surface of its base protrudes from the flange 102. The flat-head rod 103b presses against the stud rod 103a, causing the stud rod 103a to press against the internal cone.

[0011] The stoppers 105 are provided near the base end of the stud rod 103a and near the tip of the flat-head rod 103b. The stoppers 105 regulate the amount of driving by the driving rod 103 and prevent the driving rod 103 (stud rod 103a and flat-head rod 103b) from sliding out of the hollow portion. The stoppers 105 consist of a rigid annular body fitted into recesses formed near the base end of the stud rod 103a and near the tip of the flat-head rod 103b.

[0012] The hollow bolt 101 has a hollow section formed by a first hollow section 106a and a second hollow section 106b. The first hollow section 106a slidably accommodates the stud rod 103a. The second hollow section 106b has a larger inner diameter than the first hollow section 106a. The second hollow section 106b slidably accommodates the contact portion between the stud rod 103a and the flat head rod 103a. The second hollow section 106b limits the range in which the stopper 105 can move to between the flange 102 and the first hollow section 106a. Therefore, the driving rod 103 is limited to moving only as far as the length of the second hollow section 106b, thereby regulating the amount of driving. In addition, the hollow bolt 101 has multiple markings 107, such as grooves, formed on its outer circumference at equal intervals in the longitudinal direction. In this example, the interval d of marker 107 is 1 cm, but this value can be changed as needed.

[0013] Figure 1(c) shows the anchor driving jig 10 as viewed from the flange 102 side. The flange 102 is provided with a hole 108 that communicates with the hollow portion of the hollow bolt 101. The flange 102 also has a nut portion 102a formed thereon for operating with a tool such as a wrench when screwing the anchor onto and removing the threads 104 of the hollow bolt 101.

[0014] Figure 1 shows the anchor driving jig 10 with the driving rod 103 not yet driven in, and the base end (striking surface) of the flat-head rod 103b protruding from the flange 102. Figure 2 is a diagram of the anchor driving jig 10 with the driving rod 103 driven in. Figure 2(a) is an external view of the anchor driving jig 10. Figure 2(b) is a cross-sectional view of the BB of the anchor driving jig 10.

[0015] When the driving rod 103 is driven in the direction of the arrow, the striking surface of the flat head rod 103b is embedded in the hole 108 provided in the flange 102. By being embedded in the hole 108, the striking surface of the flat head rod 103b becomes substantially flush with the surface of the flange 102. When the flat head rod 103b is driven in, the stud rod 103a is pressed against the flat head rod 103b. As a result, the stud rod 103a is pushed out from the tip of the hollow bolt 101 by a predetermined length. Since the stopper 105 collides with the stepped portion between the second hollow portion 106b and the first hollow portion 106a, the further movement of the stud rod 103a is restricted.

[0016] FIG. 3 is a configuration diagram of the anchor. FIG. 3(a) is an external view of the anchor 20. FIG. 3(b) is an A-A cross-sectional view of the anchor 20. The anchor 20 of the present embodiment is an internal cone driving type. One end side of the anchor main body 201 of the anchor 20 is an enlarged diameter portion 202 having a slit 203. The anchor main body 201 is a hollow body with a central hole, and an internal cone 204 is inserted into the central hole. A screw 205 is threaded on the other end side of the anchor main body 201 where the slit 203 is not provided.

[0017] The anchor 20 in FIG. 3 shows a state where the enlarged diameter portion 202 is not expanded. The configuration of the anchor 20 in a state where the enlarged diameter portion 202 is expanded is shown in FIG. 4. FIG. 4(a) is an external view of the anchor 20 in a state where the enlarged diameter portion 202 is expanded, and FIG. 4(b) is an A-A cross-sectional view of the anchor 20. When the internal cone 204 is pressed by the anchor driving jig 10 and moves in the direction of the arrow, the slit 203 portion of the enlarged diameter portion 202 is pushed and expanded by the internal cone 204. The enlarged diameter portion 202 is in a state of being radially expanded in the radial direction when the slit 203 is pushed and expanded by the internal cone 204.

[0018] Figures 5 and 6 are explanatory diagrams showing the anchor 20 attached to the anchor driving jig 10. Figure 5 shows the state before the driving rod 103 is driven in (before the anchor 20 is driven in), and Figure 6 shows the state after the driving rod 103 has been driven in (after the anchor 20 has been driven in). Figures 5(a) and 6(a) are external views of the anchor 20 attached to the anchor driving jig 10. Figures 5(b) and 6(b) are cross-sectional views of AA.

[0019] The anchor 20 is attached to the anchor driving jig 10 by screwing the thread 205 of the anchor 20 onto the thread 104 of the hollow bolt 101. As a result, the tip of the driving rod 103 (stud rod 103a) of the anchor driving jig 10 comes into contact with the internal cone 204 of the anchor 20. The thread 104 of the hollow bolt 101 and the thread 205 of the anchor 20 only need to be male threads on one side and female threads on the other. In this embodiment, the thread 104 of the hollow bolt 101 is a male thread, and the thread 205 of the anchor 20 is a female thread.

[0020] As the driving rod 103 is driven in, the stud rod 103a presses against the internal cone 204 of the anchor 20. This pushes the internal cone 204 toward the enlarged diameter portion 202, and the slit 203 portion of the enlarged diameter portion 202 is expanded. As described above, the range of movement of the driving rod 103 is restricted by the stopper 105, so the internal cone 204 is prevented from popping out of the anchor 20.

[0021] (Example of use) Next, an example of using the anchor driving jig 10 of this embodiment will be described. Figures 7 and 8 are explanatory diagrams showing how to embed an anchor 20 in concrete using such an anchor driving jig 10. Figure 7(a) is a cross-sectional perspective view before anchor driving, and Figure 7(b) is a cross-sectional view before anchor driving. Figure 8(a) is a cross-sectional perspective view after anchor driving, and Figure 8(b) is a cross-sectional view after anchor driving. The anchor 20 is embedded in a hole (core hole 43) drilled in the concrete 40. When the anchor 20 is inserted into the core hole 43, the enlarged diameter portion 202 expands, and the anchor 20 is fixed in place by the frictional force between the wall surface of the core hole 43 and the enlarged diameter portion 202.

[0022] When the anchor 20 is directly embedded in the concrete 40 where the concrete surface is exposed, it is possible to embed the anchor 20 to a sufficient depth even with a conventional anchor driving jig. However, as shown in Figures 7 and 8, when the concrete surface is not exposed and a material weaker than the concrete 40 is provided as the exterior of the concrete surface, it is not possible to embed the anchor 20 to a sufficient depth in the concrete 40 with a conventional anchor driving jig.

[0023] In Figures 7 and 8, an exterior covering (mortar 41 and tiles 42) is provided on the concrete surface. The driving length T1 in the anchor driving jig 10 is equal to the length of the anchor 20, but the core hole 43 is drilled to a depth T2 that is deeper than the driving length T1 by the thickness of the mortar 41 and tiles 42.

[0024] The anchor driving jig 10 is equipped with a hollow bolt 101, allowing for adjustment of the depth to which the anchor 20 is embedded. The markings 107 on the hollow bolt 101 allow for determination of the length to which the hollow bolt 101 has been inserted into the core hole 43. In the examples shown in Figures 7 and 8, the hollow bolt 101 is inserted into the core hole 43 to the length of the third marking 107 from the tip.

[0025] When driving in the anchor 20, a core hole 43 is pre-drilled. When drilling the core hole 43, the worker determines the depth T2 in advance and drills the core hole 43 using a tool such as a drill. The depth T2 is determined by the sum of the thickness of the mortar 41 and tile 42 and the driving length T1. The worker inserts the anchor 20, which is attached to the anchor driving jig 10, into the core hole 43 while checking the mark 107 on the hollow bolt 101 according to the depth T2 of the core hole 43. The outer diameter of the flange 102 is made larger than the outer diameter of the core hole 43, preventing the entire anchor driving jig 10 from being inserted into the core hole 43.

[0026] Subsequently, the anchor driving machine 30 is attached to the anchor driving jig 10. The anchor driving machine 30 is a portable hydraulic processing machine that moves a piston, for example, by supplying pressurized oil. The anchor driving machine 30 in this embodiment comprises a housing 31, a cylinder 32, a pump case 33, and a piston 34.

[0027] The housing 31 accommodates the flange 102, thereby mounting the anchor driving jig 10. The cylinder 32 has a piston 34 inside, and a space is provided on the housing 31 side for accommodating the driving rod 103. The pump case 33 contains pressurized oil, and when an operation button (not shown) is pressed, the pressurized oil moves the piston 34 toward the driving rod 103.

[0028] The piston 34 moves, pressing against the striking surface of the driving rod 103. This causes the driving rod 103 to move, which in turn moves the internal cone 204 of the anchor 20, expanding the diameter-expanded portion 202. Because the diameter-expanded portion 202 of the anchor 20 contacts the concrete 40 without contacting the mortar 41 and tile 42 portions which are weaker than the concrete 40, the necessary frictional force can be secured between the anchor 20 and the wall surface of the core hole 43. As a result, the anchor 20 is embedded in the concrete 40 in a way that prevents it from being pulled out.

[0029] After the anchor 20 is embedded, the anchor driving machine 30 is removed from the anchor driving jig 10, and then the anchor driving jig 10 is removed from the anchor 20. At this time, if the anchor 20 is firmly fastened to the anchor driving jig 10, the worker can easily remove the anchor driving jig 10 from the anchor 20 by manipulating the nut portion 102a formed on the flange 102 with a tool such as a wrench.

[0030] Figure 9 is an explanatory diagram showing how anchors 20 are embedded in concrete 40 when the thickness of the exterior is different. In Figure 9(a), the mortar 41 is 20 mm thick and the tiles 42 are 10 mm thick, resulting in a total exterior thickness of 30 mm. In Figure 9(b), the mortar 41 is 40 mm thick and the tiles 42 are 10 mm thick, resulting in a total exterior thickness of 50 mm.

[0031] Due to the different thicknesses of the outer casings, the length of the hollow bolt 101 of the anchor driving jig 10 that is inserted into the core hole 43 is different. In Figure 9(a), the hollow bolt 101 is inserted into the core hole 43 to the length from the tip to the third mark 107. In Figure 9(b), the entire hollow bolt 101 (length from the tip to the fifth mark 107) is inserted into the core hole 43. By visually checking the mark 107 in this way, it becomes easier to insert the anchor 20 to the appropriate position (depth) in the core hole 43. The central axis length of the hollow bolt 101 is expressed as (T3-T1). Since T3 > T2, the central axis length of the hollow bolt 101 is greater than or equal to the difference between the depth T2 and the driving length T1 (T2-T1 or greater).

[0032] Thus, the anchor driving jig 10 of this embodiment, by having a hollow bolt 101, can drive the anchor 20 into a core hole 43 with depths T2 and T3 that are deeper than the driving length T1. In addition, since multiple markers 107 are provided on the hollow bolt 101, the depth (position) when embedding the anchor 20 can be appropriately adjusted.

[0033] (Variation 1) The anchor driving jig 10 may be made adjustable to the depth of the core hole 43 by making the length (central axis length) of the hollow bolt 101 variable. In this case, for example, the hollow bolt 101 and the flange 102 are configured to be separable. The hollow bolt 101 is prepared in several different lengths and selected according to the depth of the core hole 43 before being attached to the flange 102.

[0034] Figure 10 is an explanatory diagram of an anchor driving jig 10a with a variable length hollow bolt. The hollow bolt 501 and the flange 502 are, for example, screwed together. The tightening torque between the hollow bolt 501 and the flange 502 is set to be greater than the tightening torque between the hollow bolt 501 and the anchor 20. Alternatively, the tightening direction between the hollow bolt 501 and the flange 502 and the tightening direction between the hollow bolt 501 and the anchor 20 are set to opposite directions. By screwing them together in this way, it is possible to prevent the flange 502 from being removed from the hollow bolt 501 before the anchor 20 is removed when removing the anchor 20 from the anchor driving jig 10a.

[0035] The driving rods 503 are also prepared in multiple different lengths according to the length of the hollow bolt 501, and are inserted into the hollow portion of the hollow bolt 501 of the corresponding length. The driving rods 503 may be prepared in multiple different lengths for both the stud rods 503a and the flat-head rods 503b, or one length may be fixed and the other may be prepared in multiple different lengths. For example, the length of the flat-head rods 503b may be fixed and the stud rods 503a may be prepared in multiple different lengths.

[0036] The hollow bolt 501 is positioned so that the second hollow portion 506b is in contact with the flange 502. The amount of movement of the driving rod 503 required to expand the enlarged diameter portion 202 by the internal cone 204 is the same as in Figure 1, and the length of the second hollow portion 506b is approximately the same as the length of the second hollow portion 106b described in Figure 1. The length of the flat-head rod 503b is approximately the same as the length of the flat-head rod 103b described in Figure 1. Therefore, the configuration of the flange 502, the flat-head rod 503b, and the second hollow section 506b can be roughly the same as in Figure 1.

[0037] The stud rod 503a is made longer by the same amount as the lengthened hollow bolt 501 and is slidably housed in the first hollow section 506a. Stoppers 105 similar to those in Figure 1 are provided near the base end of the stud rod 503a and near the tip of the flat-head rod 503b. The stoppers 105 restrict the amount driven by the driving rod 503 and prevent the driving rod 503 from sliding out of the hollow section.

[0038] (Modification 2) Furthermore, by constructing the hollow bolt 101 by connecting multiple detachable hollow members, it is possible to make the length (central axis length) of the hollow bolt 101 variable. Figure 11 is a diagram of the configuration of an anchor driving jig in which the hollow bolt 101 is composed of multiple hollow members.

[0039] As shown in Figure 11(a), the anchor driving jig 10b has a hollow bolt 601 composed of multiple hollow members 601a, 601b. The other configurations are the same as those of the anchor driving jig 10 described in Figure 1, except that the hollow member 601b is configured to be separable from the flange 602.

[0040] Figure 11(b) illustrates the configuration of the hollow bolt 601. The hollow member 601a has a screw 104 threaded at one end into which the anchor 20 is screwed, and a screw 610 threaded at the other end into which the hollow member 601b is screwed. The hollow member 601b has a screw 611 threaded at the end on the hollow member 601a side, and a screw 612 threaded at the other end. The flange 602 has a screw 613 threaded into which the hollow member 601b is screwed.

[0041] In this embodiment, screws 610 and 612 are female threads, and screws 611 and 613 are male threads, but this can be reversed. Also, the tightening direction of the screw 104 into which the anchor 20 is screwed and the screws 610, 611, 612, and 613 are opposite. By screwing them in this way, when removing the anchor 20 from the anchor driving jig 10b, it is possible to prevent the hollow members 601a, 601b and flange 602 from being removed before the anchor 20 is removed. Note that even if the tightening direction of the screw 104 into which the anchor 20 is screwed and the screws 610, 611, 612, and 613 are the same, a similar effect can be obtained by setting the tightening torque of screws 610, 611, 612, and 613 to be greater than the tightening torque of screw 104 and the anchor 20.

[0042] Figure 11 illustrates an example in which a hollow bolt 601 is constructed from hollow members 601a and 601b, but more hollow members 601b may be connected. In other words, the number of hollow members 601b is determined according to the depth of the core hole 43, and the determined number of hollow members 601b are connected in series between hollow member 601a and flange 602. The lengths of the multiple hollow members 601b may be the same or different, but having them the same length is advantageous in terms of management and productivity. The length of the hollow members 601b may be the same as, for example, the interval d of the markers 107 (see Figure 1).

[0043] The driving rod 603 may be available in various lengths, as in the first modification, but it may also be variable according to the length of the hollow bolt 601. Figure 12 is an explanatory diagram of a driving rod 603 with a variable length. The driving rod 603 is composed of a stud rod 615a, an intermediate rod 615b, and a flat head rod 615c. The functions of the stud rod 615a and the flat head rod 615c are the same as those of the stud rod 103a and the flat head rod 103b described above.

[0044] The intermediate rod 615b is connected to the stud rod 615a and the flat-head rod 615c. There are various connection methods, but the connection is made with a bonding force sufficient to maintain the stud rod 615a, intermediate rod 615b, and flat-head rod 615c in a straight line even when driven by the anchor driving machine 30. For example, the intermediate rod 615b is fastened to the stud rod 615a and the flat-head rod 615c with screws.

[0045] The overall length of the driving rod 603 should be such that, in the pre-driving state, the length d1 of the tip of the stud rod 615a protruding from the screw 104 and the length d2 of the base end of the flat-head rod 615c protruding from the flange 602 are the same as in Figure 1. Also, the stopper 105 is provided in the second hollow section 606b within a movable range, as in Figure 1. In Figure 12, the second hollow section 606b is provided in the hollow member 601b, and the first hollow section 606a is provided in the hollow member 601a. ​​The stopper 105 is provided near the base end of the intermediate rod 615b and near the tip of the flat-head rod 615c. The intermediate rods 615b correspond to the length of the hollow member 601b, and the same number of intermediate rods 615b are used as the number of hollow members 601b. For example, if two hollow members 601b are connected in stages, two intermediate rods 615b are also connected.

[0046] In the modified examples 1 and 2 described above, since the lengths of the hollow bolts 501 and 601 are variable, it becomes possible to embed the anchor 20 using an anchor driving jig 10a of an appropriate length according to the depth of the core hole 43. The method for driving the anchor 20 is as described in Figures 7 and 8. Because the lengths of the hollow bolts 501 and 601 are variable, when driving the anchor 20, the driving rod 103 is driven in with the flange 102 in contact with the tile 42, as shown in Figure 9(b). This allows for stable work. [Explanation of Symbols]

[0047] 10, 10a, 10b Anchor driving jig 101, 501, 601 Hollow bolts 102,502,602 flange 103,503,603 Driving rod 103a, 503a, 615a Stud rods 103b, 503b, 615c Flat head rod 20 Anchors 201 Anchor body 202 Expanded diameter part 203 Slit 204 Internal cone 30 Anchor driving machine

Claims

1. A jig for driving an internal cone-driven anchor with a driving length of T1 into a core hole T2 that is deeper than T1, comprising a hollow bolt with a central axis length of T2-T1 or greater, in which a driving rod for pressing the internal cone of the anchor is slidably housed in the hollow portion, The outer circumference of one end of the hollow bolt is threaded to accommodate the anchor, An anchor driving jig, wherein the other end of the hollow bolt is provided with a flange with an outer diameter larger than the outer diameter of the core hole.

2. The driving rod consists of a stud rod that presses against the internal cone at its tip and a flat-head rod that presses against the stud rod at its tip. Stoppers are provided near the base end of the stud rod and near the tip of the flat-head rod to regulate the amount of drive and the sliding out of the hollow portion. The anchor driving jig according to claim 1.

3. The hollow portion comprises a first hollow portion that slidably accommodates only the stud rod, and a second hollow portion having a larger inner diameter than the first hollow portion that slidably accommodates the contact portion between the stud rod and the flat head rod. The anchor driving jig according to claim 2.

4. The stopper is composed of a rigid annular body fitted into recesses formed near the base end of the stud rod and near the tip of the flat-head rod. The anchor driving jig according to claim 2.

5. The aforementioned hollow bolts are provided in multiple quantities with different central axis lengths and are configured to be interchangeable with respect to the flange. The anchor driving jig according to claim 1.

6. The aforementioned hollow bolt is configured such that multiple hollow members can be detachably connected and the central axis length is variable. The anchor driving jig according to claim 1.

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