JP2007032039A - Spacer for anchor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a practical spacer for an anchor, which is effective for workability and a reduction in material, while maintaining the property of the simple mounting of the spacer on the anchor from a lateral direction and the stable holding of the spacer. <P>SOLUTION: This spacer for the anchor comprises: holding parts 5 and 6 on both sides, which have openings 3 and 4 capable of being mounted by being pressed against the anchor in the lateral direction; a connecting part 7 which connects the holding parts 5 and 6 on both the sides to each other; and interval maintaining pieces 8 and 9 which are provided on the connecting part 7, and which are equipped with inner-surface abutting parts abutting on the inner surface of the insertion hole of the anchor. A part, which is formed by curving the connecting part, connecting the holding parts on both the sides, to the outside, can also be used as the interval maintaining piece. Additionally, the interval maintaining piece can also be provided via supporting pieces which are installed on both the sides of the holding part, and the inner-surface abutting part can also be formed by forming the interval maintaining pieces, installed on both the sides of the holding part, in a bent manner. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In the present invention, for example, when an anchor such as a lock bolt is installed on the ground, the anchor is inserted into an anchor insertion hole such as an installation hole formed in the ground in a state of being attached to the anchor, and is in contact with the inner surface of the insertion hole. The present invention relates to an anchor spacer that maintains the anchor covering thickness.

  Conventionally, various anchors such as rock bolts and ground anchors are widely used for ground stabilization construction and tunnel construction. These anchors are inserted into the anchor installation holes drilled in the ground, and are fixed to the ground by filling the surroundings with an appropriate grout material. It is widely used as a support means for connecting materials such as wire ropes used in a natural slope stabilization method that keeps the state as much as possible to stabilize the slope. In the anchoring operation of the anchor, it is important to appropriately secure the cover thickness of the grout material to the anchor. For this reason, the anchor is used as a means for maintaining the cover thickness by separating the anchor from the inner wall of the installation hole. Spacers are widely used in general.

With regard to such an anchor spacer, it is installed between the cylindrical gripping portions on both sides provided with an opening for inserting an anchor in the peripheral wall, and the cylindrical gripping portions on both sides thereof, and the respective intermediate portions bulge outward in the radial direction. A lantern-shaped anchor spacer configured to be mounted by pressing from the side against an anchor through an opening provided in the cylindrical gripping portion (Patent Document 1). By the way, in the case of this lantern type anchor spacer, it is excellent in various points such as easy mounting of the spacer to the anchor and stable holding of the spacer, but the processing is complicated due to the shape of the lantern type. In addition, there is a technical problem that the material between the spacing pieces is wasted and the material cost is increased.
JP 2004-308406 A

  The present invention was developed in view of the above-described conventional technical situation, and while maintaining easy attachment from the side to the anchor and stable holding of the spacer, it is possible to reduce workability and material. It is another object of the present invention to provide a more practical anchor spacer that is effective.

  In order to solve the above-mentioned problem, in the invention of claim 1, gripping portions on both sides having openings that can be press-fitted to the anchor from the side, a connecting portion that connects the gripping portions on both sides, and the connection Technical means is adopted in which the spacer for the anchor is formed from a distance holding piece that is provided in the portion and includes an inner surface abutting portion that abuts on the inner surface of the insertion hole of the anchor. The spacing piece can be integrally bent on both sides of the connecting portion (Claim 2). In addition, the inner surface abutting portion is formed to be curved outwardly along the axial direction of the anchor, thereby facilitating smooth insertion of the anchor into the insertion hole. Furthermore, you may make it form the latching piece which can be latched by the uneven | corrugated | grooved part of the outer peripheral surface of the said anchor at the said connection part, and can prevent the movement of an axial direction (Claim 4). In the invention of claim 5, it comprises a grip portion on both sides having an opening that can be press-fitted to the anchor from the side, and a connecting portion that connects the grip portions on both sides, and the connecting portion is curved outward. Therefore, the technical means of using as a distance holding piece was adopted. In the invention of claim 6, a gripping portion having an opening that can be press-fitted to the anchor from the side, support pieces installed on both sides of the gripping portion, an insertion hole of the anchor provided in the support piece The technical means of constituting the spacer for anchor from the interval holding piece provided with the inner surface abutting portion that abuts against the inner surface of the inner surface was adopted. The invention according to claim 7 comprises a gripping portion having an opening that can be press-fitted to the anchor from the side, and a spacing holding piece installed on both sides of the gripping portion, and the spacing holding piece is bent and formed. Thus, a technical means for forming an inner surface contact portion that contacts the inner surface of the insertion hole of the anchor was employed. Incidentally, the anchor insertion hole in each of the above inventions includes not only an anchor installation hole formed in the ground but also an anchor insertion hole formed by an outer tube or a protective tube of a drilling device.

According to the anchor spacer according to the present invention, the following effects can be obtained.
(1) Since it can be pressed and attached to the anchor from the side through the opening of the grip portion, the attaching operation to the anchor is very simple.
(2) Since the shape is simple, the workability can be greatly improved while maintaining easy mounting and stable holding, which is comparable to conventional lanterns, and less wasted material. Costs can be saved and, in turn, production costs can be significantly reduced.
(3) If the inner surface abutting portion is curved and convex outward along the axial direction of the anchor, smooth insertion of the anchor into the insertion hole is facilitated.

  The spacer for anchors according to the present invention can be widely applied as a spacer for holding the covering thickness of various anchors such as rock bolts and ground anchors. The anchor spacer according to the present invention is such that the opening of the gripping portion is applied to the anchor from the side, and the opening is pressed in a state where the opening is expanded against the spring force of the gripping portion. Can be easily mounted from the side. In addition, the spacer can be accurately fixed to the anchor by the spring force. The gripping portion and the connecting portion that connects them may be formed by bending from a single sheet of material, or may be integrally joined later by welding or the like. Similarly, the connecting portion and the spacing piece may be formed by bending from a single plate material, or may be integrally joined later. Of course, it is needless to say that all of the gripping portion, the connecting portion, and the interval holding piece may be formed by bending a single plate material. If the inner surface abutting portion provided on the interval holding piece is curved so as to follow the inner surface shape of the insertion hole, a stable interval holding function can be obtained. Also, if the inner surface abutting portion is curved and formed in an outwardly convex state along the axial direction of the anchor, the anchor can be inserted smoothly into the insertion hole.

  The longer the length of the inner surface abutting portion, the longer the abutting length with the inner surface of the insertion hole, so that the spacing maintaining function is further stabilized, but the outer shape as a spacer becomes larger. Therefore, it becomes difficult to insert the anchor into the insertion hole. The interval holding piece can be set so that the whole including the inner surface abutting portion falls within a semi-circle or less. Can be easily inserted, and the material can be significantly reduced and lightened. However, since the contact portion with the inner surface of the insertion hole is less than or equal to a semicircular circumference and the action area of the interval maintaining function is reduced, a device is required for the direction of attachment to the anchor. That is, when the anchor insertion holes are in an inclined state, the anchor spacers are mounted in a state of being aligned substantially linearly with respect to the anchors, and the anchor holes are directed downward. By contacting the inner surface of the lower side, an accurate spacing function can be obtained by its own weight. On the other hand, when the insertion hole is nearly vertical, it is possible to accurately maintain the spacing in all directions by changing the mounting direction of each anchor spacer with respect to the anchor.

  Furthermore, the insertion of the anchor fitted with the anchor spacer according to the present invention into the insertion hole can be applied not only to the anchor installation hole directly drilled in the ground but also to various working forms. It is. For example, when a predetermined drilling process is completed using a double-pipe drilling device, the outer tube remaining after pulling out the inner rod or the like, or in order to pull out the outer tube, is further inside the outer tube. It is also possible to apply to an operation mode in which an anchor is inserted into the protective tube to be inserted, and the outer tube and the protective tube are pulled out before the grout material injected before and after the insertion of the anchor is solidified. . That is, the insertion hole to which the present invention is applied includes not only the anchor installation hole drilled in the ground, but also the holes inside the outer tube and the protective tube. If these outer tubes and protective tubes are in an inclined state, the spacers should be inserted while sliding on the inner surfaces of the outer tubes and protective tubes with the spacers aligned in a line facing downward. The insertion operation itself is greatly simplified.

  FIG. 1 is a state explanatory view showing a state in which an anchor spacer according to a first embodiment of the present invention is attached to an anchor. In the figure, reference numeral 1 denotes an anchor made of a screw-shaped lock bolt, and 2 denotes an anchor spacer according to a first embodiment of the present invention. As illustrated, the anchor spacer 2 is attached to the anchor 1 from the side. 2 to 4 show the anchor spacer 2. FIG. 2 is a front view, FIG. 3 is a plan view, and FIG. 4 is a side view. As shown in FIGS. 2 and 3, the anchor spacer 2 according to the present embodiment includes gripping portions 5 and 6 having openings 3 and 4 that can be pressed and attached to the anchor 1 from both sides on both sides. The gripping portions 5 and 6 are connected by the connecting portion 7, and the distance holding pieces 8 and 9 are bent from both sides of the connecting portion 7. As shown in FIG. 4, these interval holding pieces 8 and 9 are configured by interval forming portions 10 and 11 and inner surface abutting portions 12 and 13 that abut on the inner surface of the insertion hole, respectively. The interval holding pieces 8 and 9 composed of the interval forming portions 10 and 11 and the inner surface abutting portions 12 and 13 are entirely half-centered around the central portion of the gripping portions 5 and 6 as shown in the drawing. It is configured to fit within a circle. Incidentally, since the gripping portions 5 and 6 and the interval holding pieces 8 and 9 are arranged in parallel as shown in FIG. 4, it is possible to cut the plate with less waste as is apparent if they are developed. .

  FIG. 5 is a cross-sectional view showing a state where the anchor spacer 2 is attached to the anchor 1. (A)-(C) in this figure is sectional drawing which illustrated the mounting state of the spacer 2 for anchors from which the mounting direction with respect to the anchor 1 differs. As shown in the figure, in the case of the present embodiment, the tip portions 14 and 15 of the gripping portions 5 and 6 are engaged with the concave and convex portions 16 on the outer peripheral surface of the anchor 1 so that the axial direction is changed even if the mounting direction is changed. Is configured to be prevented from moving.

  6 to 8 are state explanatory views illustrating a state in which the anchor 1 with the anchor spacer 2 attached is inserted into the insertion hole. FIG. 6 shows the case of inserting into the installation hole 17 drilled in the ground. In the figure, 18 indicates a projecting portion in the middle of the installation hole 17, and as described above, the interval holding pieces 8 and 9 are entirely accommodated in a semicircle, so that they are displaced to the other according to the projecting portion 18. While passing easily. FIG. 7 shows a case where the tube is inserted into the outer tube 19 of the double tube drilling device, and FIG. 8 shows a sectional view thereof. As shown in FIG. 8, an extremely smooth insertion operation is possible by sliding while the inner surface abutting portions 12 and 13 of the spacing members 8 and 9 are in contact with the lower half of the outer tube 19. FIG. 9 is a state explanatory view illustrating the mounting state of the anchor spacer 2 at the time of insertion into the insertion hole that is nearly vertical. As shown in the figure, the insertion hole close to the vertical can be kept spaced in all directions by changing the mounting direction of the anchor spacer 2 with respect to the anchor 1.

  10 to 12 show modified examples of the anchor spacer. FIG. 10 is a front view, FIG. 11 is a plan view, and FIG. 12 is a side view. The anchor spacer 20 according to the present embodiment includes grip portions 21 and 22 that can be pressed and attached to the anchor 1 from both sides on both sides, and both side portions of the connecting portion 23 that connects the grip portions 21 and 22. The distance holding pieces 24 and 25 are bent. These interval holding pieces 24 and 25 are respectively composed of interval forming portions 26 and 27 and inner surface abutting portions 28 and 29 that abut against the inner surface of the insertion hole. It is characterized in that it is curved and convex outward along the axial direction. In the case of the anchor spacer 20 according to the present embodiment, the inner surface abutting portions 28 and 29 are curved outwardly along the axial direction of the anchor 1, so that they are caught by the inner surface of the insertion hole. Is reduced and the insertion work becomes smoother. The connecting portion 23 is formed with a pair of locking pieces 30 that can be locked to the concavo-convex portion on the outer peripheral surface of the anchor 1 to prevent the axial movement.

  FIG. 13 is a side view showing another modified example of the anchor spacer. The anchor spacers 31 to 33 according to the present embodiment shown in (A) to (C) are characterized in the way of forming the spacing members 34 to 37, respectively. That is, the anchor spacer 31 is characterized in that the inner surface abutting portions 38 and 39 of the interval holding pieces 34 and 35 are formed downward, and the anchor spacer 32 is longer from one interval holding piece 36. This is characterized in that the inner surface contact portion 40 is formed. Further, the anchor spacer 33 is characterized in that the interval holding piece 37 is formed from a pair of arcuate portions opposed to each other as shown in the figure, and the interval holding function is provided at the lower portion thereof. FIG. 14 is a front view showing another modification example regarding the installation state of the spacing piece. As shown in the drawing, in the anchor spacer 41 according to this embodiment, the interval holding piece 45 is inclined with respect to the connecting portion 44 that connects the grip portions 42 and 43 on both sides. That is, in order to enable smoother insertion into the insertion hole, the contact surface of the inner surface contact portion is inclined with respect to the inner surface of the insertion hole so that the tip side is slightly floated.

  15 and 16 show a second embodiment of the present invention. FIG. 15 is a front view and FIG. 16 is a plan view. The anchor spacer 46 according to the present embodiment includes grip portions 49 and 50 having openings 47 and 48 that can be pressed and attached to the anchor 1 from both sides on both sides, and connects the grip portions 49 and 50. In addition to being connected by the portion 51, the interval holding piece 52 is cut and formed at the connecting portion 51. The interval holding piece 52 includes an inclined interval holding portion 53 and a horizontal inner surface abutting portion 54, and the inclined interval holding portion 53 is inserted into the insertion hole first.

  17 and 18 show a third embodiment of the present invention. FIG. 17 is a front view and FIG. 18 is a side view. The anchor spacer 55 according to the present embodiment includes grip portions 57 and 58 having openings 56 that can be pressed and attached to the anchor 1 from both sides on both sides, and a connection portion 59 is provided between the grip portions 57 and 58. The connecting portion 59 is bent so as to bulge downward, and the interval holding portions 60 and 61 inclined by the connecting portion 59 itself and the horizontal inner surface abutting portion 62 are formed. is there.

  FIG. 19 is a front view showing a fourth embodiment of the present invention. As shown in the figure, the anchor spacer 63 according to the present embodiment includes a single grip portion 64 having an opening that can be press-fitted to the anchor 1 from the side, and support pieces 65 and 66 are integrally formed on both sides thereof. And the distance holding pieces 8 and 9 constituted by the distance forming portions 10 and 11 and the inner surface abutting portions 12 and 13 according to the first embodiment with respect to the support pieces 65 and 66, respectively. Interval holding pieces 67 and 68 having the same configuration are integrally provided.

  FIG. 20 is a front view showing a fifth embodiment of the present invention. As shown in the figure, the anchor spacer 69 according to the present embodiment includes one gripping portion 70 having an opening that can be pressed and attached to the anchor 1 from the side, and spacing holding pieces 71 and 72 are provided on both sides thereof. In addition to being installed directly, the interval holding pieces 71 and 72 are bent downward to form inclined interval forming portions 73 and 74 and horizontal inner surface abutting portions 75 and 76.

  FIGS. 21 to 24 show another embodiment relating to the positioning means of the gripping part pressed and attached to the anchor from the side. In the anchor spacer 77 of FIG. 21, a locking piece 79 is cut and raised on the inner surface side of the gripping portion 78, and the locking piece 79 is locked to the unevenness of the outer peripheral surface of the anchor 1 to prevent axial movement. It was configured to be able to. In the anchor spacer 80 of FIG. 22, a locking projection 82 is formed on the inner surface side of the gripping portion 81, and the locking projection 82 is locked to the projections and depressions on the outer peripheral surface of the anchor 1 to move in the axial direction. It was configured to prevent it. In the anchor spacer 83 shown in FIG. 23, the engaging portions 87 are bent at both ends of the connecting portion 86 of the gripping portions 84 and 85, and the engaging portions 87 are engaged with the irregularities on the outer peripheral surface of the anchor 1. Thus, the movement in the axial direction can be prevented. In the anchor spacer 88, which shows only the gripping portion in FIG. 24, an engagement window 90 is formed in the gripping portion 89, and the engagement window 90 is engaged with the irregularities on the outer peripheral surface of the anchor 1, thereby It was configured to prevent movement.

It is a state explanatory view showing the mounting state of the anchor spacer according to the first embodiment of the present invention to the anchor. It is the front view which showed the spacer for the anchors. It is the top view which showed the spacer for the anchors. It is the side view which showed the spacer for the anchors. It is sectional drawing which showed the mounting state to the anchor of the anchor spacer. It is state explanatory drawing which showed the state which inserts the anchor equipped with the spacer for anchors into an installation hole. It is state explanatory drawing which showed the state which inserts the anchor equipped with the spacer for anchors into the outer tube | pipe of a double tube drilling apparatus. It is sectional drawing which showed the insertion state of FIG. It is state explanatory drawing which illustrated the mounting state of the spacer for anchors at the time of insertion with respect to the insertion hole near perpendicular | vertical. It is the front view which showed the modification of the said spacer for anchors. It is the top view which showed the modification. It is the side view which showed the modification. It is the side view which showed the other modification of the said spacer for anchors. It is the front view which showed the other modification regarding the installation state of a space | interval holding piece. It is the front view which showed the spacer for anchors concerning 2nd Example of this invention. It is the top view which showed the spacer for the anchors. It is the front view which showed the spacer for anchors concerning 3rd Example of this invention. It is the side view which showed the spacer for the anchors. It is the front view which showed the spacer for anchors concerning 4th Example of this invention. It is the front view which showed the spacer for anchors concerning 5th Example of this invention. It is the side view which showed the other Example regarding the positioning means of the holding part with respect to an anchor. It is the side view which showed the other Example regarding the positioning means of the holding part with respect to an anchor. It is the attachment state figure which cut and showed a part of other examples about the positioning means of the grasping part to an anchor. It is the attachment state figure which showed the holding part of the other Example regarding the positioning means of the holding part with respect to an anchor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Anchor, 2 ... Anchor spacer, 3, 4 ... Opening part, 5, 6 ... Gripping part, 7 ... Connection part, 8, 9 ... Space | interval holding piece 10, 11, ... Space | interval formation part, 12, 13 ... Inner surface Contact part, 14, 15 ... tip part, 16 ... uneven part, 17 ... installation hole, 18 ... projecting part, 19 ... outer tube, 20 ... anchor spacer, 21, 22 ... gripping part, 23 ... connecting part, 24 , 25 ... interval holding pieces, 26, 27 ... interval forming portions, 28, 29 ... inner surface contact portions, 30 ... locking pieces, 31 to 33 ... spacers for anchors, 34 to 37 ... interval holding pieces, 38, 39 ... Inner surface abutting part, 40 ... inner surface abutting part, 41 ... anchor spacer, 42, 43 ... gripping part, 44 ... connecting part, 45 ... spacing retaining piece, 46 ... anchor spacer, 47, 48 ... opening, 49 , 50 ... gripping part, 51 ... connecting part, 52 ... interval holding piece, 53 ... interval holding part, 54 Inner surface abutting portion, 55 ... anchor spacer, 56 ... opening, 57, 58 ... gripping portion, 59 ... connecting portion, 60, 61 ... interval holding portion, 62 ... inner surface abutting portion, 63 ... anchor spacer, 64 ... gripping part, 65, 66 ... support piece, 67, 68 ... spacing holding piece, 69 ... anchor spacer, 70 ... gripping part, 71, 72 ... spacing holding piece, 73, 74 ... spacing forming part, 75, 76 ... Inner surface contact portion, 77 ... anchor spacer, 78 ... gripping portion, 79 ... locking piece, 80 ... anchor spacer, 81 ... gripping portion, 82 ... locking projection, 83 ... anchor spacer, 84, 85 ... Gripping part, 86 ... connecting part, 87 ... locking part, 88 ... spacer for anchor, 89 ... gripping part, 90 ... engagement window

Claims (7)

  A grip portion on both sides having an opening that can be pressed and attached to the anchor from the side, a connecting portion that connects the grip portions on both sides, and a contact portion that is provided on the connecting portion and abuts against the inner surface of the insertion hole of the anchor An anchor spacer comprising an interval holding piece having an inner surface abutting portion.   The anchor spacer according to claim 1, wherein the spacing piece is integrally formed on both side portions of the connecting portion.   The anchor spacer according to claim 2, wherein the inner surface abutting portion is curved to be convex outward along the axial direction of the anchor.   The spacer for anchors according to any one of claims 1 to 3, wherein a locking piece for locking to the uneven portion of the outer peripheral surface of the anchor is provided in the connecting portion.   It comprises a gripping portion on both sides having an opening that can be pressed and attached to the anchor from the side, and a connecting portion that connects the gripping portions on both sides, and is formed by spacing the connecting portion by bending the connecting portion outward. An anchor spacer characterized by that.   A gripping portion having an opening that can be pressed and attached to the anchor from the side, support pieces installed on both sides of the gripping portion, and an inner surface contact provided on the support piece and in contact with the inner surface of the insertion hole of the anchor The spacer for anchors which consists of a space | interval holding piece provided with the contact part. It comprises a gripping part having an opening that can be press-fitted to the anchor from the side, and a spacing holding piece installed on both sides of the gripping part, and the spacing holding piece is bent to form an anchor insertion hole. An anchor spacer comprising an inner surface abutting portion that abuts on the inner surface.

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