JP2005146560A - Spacer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that one holding part moves and makes a diameter of a swelling part smaller, because only the other holding part is provided with an engaging part to be engaged with the deformed bar, in terms of a lantern-shaped spacer, both the ends of which are provided with the holding parts to be attached to the deformed bar. <P>SOLUTION: This spacer is attached to the deformed bar to be inserted into an anchor hole excavated in ground, so that a gap can be formed between the deformed bar and hole wall of the anchor hole. Both the ends have the cylindrical holding parts which are provided with the engaging parts 9 to be engaged with the deformed bar. The spacer has a double-split structure composed of two body constituting pieces 2 wherein a plurality of swelling parts 4 are provided between the holding parts. In the pair of body constituting pieces 2 which constitute a body, one of the semicircular holding parts 3 at both the ends is provided with the engaging part 9 which is arranged in a position symmetric with respect to a point; and engage-attaching parts, wherein a play of 1 mm or more is provided in the axial direction of the body, are provided on both the sides of each of the semicircular holding parts 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to improvement of a spacer attached to a deformed steel bar inserted into a drilled hole in anchor work for preventing slope collapse and fixing a ground structure to the ground.

  Anchor construction aimed at preventing or stabilizing slopes is a construction method in which an anchor body is constructed on the ground, and this is tensioned and fixed to transmit the compressive force to the ground to stabilize it. The anchor body is constructed by filling the grout material with the deformed steel bar inserted into the anchor hole excavated in the ground. In this case, by attaching one or more spacers to the deformed steel bar, the deformed steel bar is held at the center of the anchor hole, or a predetermined covering thickness of the grout material is secured.

As a conventional spacer, a so-called lantern-shaped spacer having a cylindrical holding portion for holding a deformed steel bar at both ends and inflating between the holding portions is widely used. In addition, there is a disc-shaped spacer made of plastic with a part cut away. Each of these has a shape that includes a portion that secures an interval between the anchor hole and a portion that allows the grout material to pass therethrough. And by forming with the material which has elasticity, it fits and attaches to a deformed steel bar, and it is made to hold | maintain with the elastic force.
Japanese Patent Laid-Open No. 8-085948 JP-A-11-350476

  The requirement for the spacer is that it can be easily attached to any position of the deformed steel bar. Make it difficult to move or remove from the attachment position. The portion that maintains the distance from the anchor hole should not be easily deformed. The shape is such that the grout material can easily flow in before the spacer. Since the spacer cannot be reused, it is required to make the manufacturing cost as low as possible while satisfying these requirements.

  The conventional spacer has an elastic structure to facilitate attachment to the deformed steel bar, but there is a problem that the attachment position is shifted when the anchor hole of the deformed steel bar is inserted, or the whole or part is easily detached. This not only makes it impossible to obtain a predetermined covering thickness on the deformed steel bar, but also causes damage to the deformed steel bar and the spacer and makes them easily corroded.

  In particular, in the case of a lantern-shaped spacer, if it is made of plastic or a thin metal plate to increase its elasticity, the bulging portion that secures the distance from the anchor hole is easily deformed, and a predetermined covering thickness may not be obtained. . In this respect, although the plastic disk-shaped spacer hardly deforms, there is a structural defect that the grout material is difficult to pass because the thickness is large and the gap with the anchor hole is small.

The lantern-shaped spacer has a serious problem in that it is difficult to securely hold the holding portions provided at both ends to the deformed steel bar, and the function cannot be sufficiently exhibited. For example, although the means for fastening the holding portion to the deformed steel bar with bolts and nuts is reliable, it takes a lot of time and is difficult to employ in field work. For this reason, at present, the means for providing the holding portion with the engaging portion to be engaged with the irregularities of the deformed bar steel is the mainstream, but since the pitch of the irregularities of the irregular shaped bar steel differs depending on the manufacturer, It was provided only in one holding part, and the other holding part moved and became a factor which promotes the said problems, such as the diameter of a bulging part becoming small.

  Therefore, the present inventor has achieved the present invention as a result of intensive studies in view of the above problems, and the feature thereof is that the anchor is attached to a deformed steel bar inserted into an anchor hole excavated in the ground. Thus, a gap is formed between the deformed steel bar and the hole wall of the anchor hole, and has a cylindrical holding part provided with an engaging part to be engaged with the deformed steel bar at both ends, A two-piece structure comprising two main body constituting pieces each having a plurality of bulging portions between the holding portions, and the pair of main body constituting pieces constituting the main body is attached to one of the semicircular holding portions at both ends. In addition to providing the engaging portions disposed at point-symmetric positions, engaging portions having a play of 1 mm or more in the axial direction of the main body are provided on both sides of each semicircular holding portion.

  Here, the “deformed bar” in the present specification is a tension material in anchor work, and refers to a bar-shaped steel material having screw-like irregularities on the whole or a part of its peripheral surface. One or more spacers are attached to the deformed steel bar and inserted into an anchor hole excavated in the ground. By providing the spacer, an anchor body that secures a predetermined covering thickness of the grout material filled around the deformed steel bar is formed.

  The “holding portion” refers to a portion that is externally fitted to the deformed steel bar. The spacer according to the present invention has a lantern shape having a plurality of bulging portions between holding portions disposed at both ends, and has a split structure composed of two main body constituting pieces. For this reason, the main body constituting piece has a semicircular holding portion at both ends, and has a shape including a plurality of bulging portions therebetween. The shape of the bulging portion is not particularly limited as long as it is overhanged to provide a predetermined covering thickness on the deformed steel bar. For example, in addition to a curved shape or a bent shape, a waveform may be used.

  The “engagement portion” refers to a portion provided in the holding portion and engaged with the irregularities of the deformed steel bar. Engaging parts include protrusions and ridges that protrude toward the inner surface of the holding part, concave ridges and through-holes that face the inner surface of the holding part, and engage with recesses and protrusions of deformed steel bars. Anything to do. In this invention, this engaging part is provided in the point symmetrical position of a pair of main body structural piece. That is, it is provided only on one of the semicircular holding portions of the main body constituting piece, and one (one set) engaging portion is provided on both holdings as the entire spacer.

  The “engaging portion” is provided at both end portions of each semicircular holding portion of the main body constituting piece, and refers to a portion formed by connecting a pair of main body constituting pieces to each other to form a spacer. As the engaging portion, in addition to a combination of hooks, a combination of a retaining piece and a retaining hole, one engaging portion of the semicircular holding portion may be a rotating portion. In addition to inserting a separate pin into the rotating portion and using it as a rotating shaft, the rotating portion may use the engaging portion as a rotating shaft and a rotating bearing. When the engaging portion is a rotating portion, a spring that biases the pair of main body constituent pieces in an open state or a closed state may be provided, and the spring may be provided with a separate coil spring or leaf spring. A part of the component piece may be a leaf spring. The state in which the pair of main body constituent pieces are connected by the engaging portion does not necessarily require the deformed steel bar to be fixed by the holding portion, and the state in which the engaging portion provided in the holding portion engages with the irregularities of the deformed steel bar is maintained. I can do it.

  In the present invention, the engaging portion is provided with a play of 1 mm or more in the axial direction of the main body. This is because the other main body constituent piece is engaged with one main body constituent piece so as to be movable and adjustable by 1 mm or more in the axial direction, thereby making it possible to correspond to the pitches of the irregularities which are different depending on the deformed steel bar. Thereby, the axial interval of the engaging portion provided at the point-symmetrical position can be matched with the irregularities of the deformed steel bar, and the holding parts at both ends can be reliably engaged with the deformed steel bar. If the engagement portion has a play of about 2 mm to 3 mm, it can correspond to most deformed steel bars.

Since the spacer according to the present invention is composed of a pair of main body constituent pieces, by combining two main body constituent pieces of the same shape, the cost can be further reduced from the viewpoint of mold cost and parts management. Can do. Needless to say, the engaging portion is provided at a point-symmetrical position, and the rotating shaft and the rotating bearing can be provided as the engaging portion by only one main body component piece.

  In the spacer according to the present invention, the engaging portion to be engaged with the irregularities of the deformed steel bar is arranged at the point-symmetrical position of the pair of main body constituting pieces, and the engaging portion connecting the pair of main body constituting pieces has a play of 1 mm or more. By providing, attachment to a deformed steel bar can be ensured. In other words, it is not a means for attaching to a deformed steel bar by the elasticity of the main body as in the conventional case, but is a structure in which a pair of main body constituting pieces are connected by an engaging portion that is engaged with each other, so that it is hardly detached from the deformed steel bar . In particular, it is possible to prevent the movement of each holding portion in the axial direction by providing the holding portions at both ends to be engaged with the irregularities of the deformed steel bar. This not only prevents the spacer body from moving in the axial direction but also does not change the spacing between the holding portions, and prevents changes in the outer diameter of the bulging portion in the lantern-shaped spacer. Very useful.

Since the spacer of the present invention is constructed by connecting a pair of main body constituent pieces, the number of parts can be reduced by combining two main body constituent pieces of the same shape, and the spacer assembly and deformed bar steel It is possible to achieve a significant cost reduction while maintaining the above-described effects, such as facilitating the mounting operation.

The present invention relates to a member that is formed by a pair of body constituting pieces as a member for securing a predetermined covering thickness of a tendon material in an anchor work, and is engaged with irregularities of deformed steel bars at point-symmetrical positions of holding portions arranged at both ends. The above-mentioned problem has been solved by providing a joint portion and providing a play of 1 mm or more in the engaging portion connecting the pair of main body constituting pieces.

  FIG. 1 shows an example of a spacer 1 according to the present invention, which is a split structure composed of two main body constituting pieces 2, a holding part 3 for attaching to a deformed steel bar B at both ends, and the holding part A plurality of bulged portions 4 for giving a predetermined covering thickness to the deformed steel bar B are provided between the three. This is a structure in which the engaging portions are provided at both end portions of each semicircular holding portion 31 constituting the holding portion 3 so as to be held together and connected. In this example, one of the engaging portions of the semicircular holding portion 31 is a rotating portion 5, and a pin 6 is inserted into the rotating portion 5 so as to be rotatably connected. The other engaging part is made into the insertion piece 7 and the insertion hole 8 which engages this. And the engaging part 9 for engaging with the unevenness | corrugation of the deformed steel bar B is provided in one semicircular holding part 31 of each main body structural piece 2 in a point-symmetrical position.

The engaging portion 9 is arranged at a point-symmetrical position of the pair of main body constituting pieces 2, the rotating portion 5 is connected with a play of about 2 mm in the axial direction, and the inserting piece 7 is connected to the inserting hole 8 By further narrowing the width by about 2 mm, the main body constituting pieces 2 can be connected to each other so that the axial interval between the two engaging portions 9 can be adjusted by about 2 mm. For this reason, regardless of the uneven pitch of the deformed steel bar B as shown in FIG. 2, the two engaging portions 8 are aligned with the unevenness, and the other body constituting piece 2 is axially moved with respect to the one body constituting piece 2. It can be connected by shifting.

3 (a) and 3 (b) show another example of the spacer 1 according to the present invention. In order to form a pair of main body component pieces 2 by combining two main body component pieces 2, The engaging part corresponding to the line symmetrical position of the central axis (the central axis in the direction crossing the bulging part 4) orthogonal to the axis is provided. Thereby, the spacer 1 in which the engaging portion 9 is arranged at the point-symmetrical position can be configured by combining the one main body component piece 2 at the point-symmetrical position as shown in FIG. In this case as well, the position of the engaging portion 9 can be adjusted by providing about 2 mm of play in each engaging portion.

4 (a), 4 (b), and 4 (c) show still another example of the spacer 1 according to the present invention, and a pair of main body component pieces 2 are combined to form a pair of main body component pieces 2, The engaging portion is a combination of the rotary shaft 10 and the rotary bearing 11. In each of the above embodiments, a separate pin 6 is inserted into the rotating portion 5 so as to be rotatable, but in this example, the main body constituting piece 2 is provided with a rotating shaft 10 and a rotating bearing 11, It can be connected and rotated. The rotary bearing 11 may be closed with a tool or a finger after the rotary shaft 10 is fitted and connected as a pair of main body constituting pieces 2, but when they are attached to the deformed steel bar B, they are engaged to rotate. You may make it attach while moving.

FIG. 5 shows still another example of the spacer 1 according to the present invention, which has a structure in which the insertion piece 7 and the insertion hole 8 are combined only. This is attached in such a manner that the two main body constituting pieces 2 are held together with the deformed steel bar B at the site or the like. When two pieces of disassembled body components 2 are combined on site, the combination direction can be identified by the shape of the engaging portion and the position of the engaging portion 9, but a paint is applied for more clarity. A protrusion or the like may be provided.

When a pair of main body constituting pieces 2 are rotatably connected, such as a combination of the rotating portion 5 and the pin 6, or the rotating shaft 10 and the rotating bearing 11, a pair of springs 12 are provided as shown in FIG. The main body component piece 2 may be biased to an open state. This is to prevent the pair of main body constituting pieces 2 whose ends are rotatably connected from being closed, and it is necessary to open them one by one when they are attached to the deformed steel bar B. It is because it will become difficult to remove | deviate if it enters the insertion hole 8. FIG.

It is a perspective view which shows an example of the spacer which concerns on this invention. (Example 1) It is a perspective view which shows the state which attached the spacer shown in FIG. 1 to the deformed steel bar. The other example of the spacer which concerns on this invention is shown, (a) is a top view, (b) is a front view, its left side view, and a right side view, (c) is the state combined as a pair of main body structural piece. FIG. (Example 2) The other example of the spacer which concerns on this invention is shown, (a) is a top view, (b) is a front view, its left view, and right view, (c) is the state combined as a pair of main body structural piece FIG. Example 3 It is a top view which shows the other example of the spacer which concerns on this invention. (Example 4) It is a top view which shows the other example of the spacer which concerns on this invention. (Example 5)

Explanation of symbols

B Shaped bar 1 Spacer 2 Body component 3 Holding part
31 Semicircular holding part 4 Swelling part 5 Rotating part 6 Pin 7 Insertion piece 8 Insertion hole 9 Engaging part 10 Rotating shaft 11 Rotating bearing 12 Spring

Claims (6)

  In anchor work, a gap is formed between the deformed steel bar and the hole wall of the anchor hole by attaching it to the deformed steel bar inserted into the anchor hole excavated in the ground. A two-piece structure comprising two main body constituent pieces each having a cylindrical holding portion provided with a joint portion and having a plurality of bulging portions between the holding portions, and constitutes a main body The pair of main body constituting pieces is provided with an engaging portion arranged at a point-symmetrical position on one of the semicircular holding portions at both ends, and a play of 1 mm or more in the axial direction of the main body on both sides of each semicircular holding portion. The spacer characterized by providing the engaging part which has.   The spacer according to claim 1, wherein the main body is configured by combining two main body constituent pieces having the same shape.   The spacer according to claim 1 or 2, wherein one of the engaging portions in each semicircular holding portion is a rotating portion.   The spacer according to claim 3, wherein the rotating part is inserted through a separate rotating shaft.   The spacer according to claim 3, wherein the rotating part has one of the engaging parts in each semicircular holding part as a rotating shaft and a rotating bearing.   The spacer according to claim 3, wherein the rotating portion is provided with a spring that biases the pair of main body constituent pieces in an open state.

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