JP2019085700A - Load transmission part structure from anchor to pressure receiving plate - Google Patents

Abstract

To provide a load transmission part structure from an anchor to a pressure plate which can achieve both accurate dispersion of a load transmitted from an anchor to the entire pressure receiving plate and optimization of an angle of a pressure receiving plate bottom surface and the anchor without increasing trouble in pressure receiving plate manufacturing work.SOLUTION: A load transmission part structure 10 from an anchor to a pressure receiving part in a slope stabilization system 1 includes: an anchor 2 embedded in a slope S in a state in which an anchor head part 12 is exposed; and a pressure receiving plate 3 having a receiving pedestal 20 on which the anchor head part 12 is placed, and a body part 4 for receiving a tensioning force of the anchor 2 with respect to a natural ground via the receiving pedestal 20. In the receiving pedestal 20, compression strength is larger than that of the body part 4 of the pressure receiving plate 3, and it has: a side wall part 21 in which an outside surface has a conical shape tapered in the natural ground direction; and a bottom wall part 22 formed as a spherical surface whose inside surface is a concave shape. The anchor head part 12 is formed as a convex spherical surface in which an outside surface has substantially the same curvature with respect to the concave spherical surface on the inside surface of the bottom wall part 22 of the receiving pedestal 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a load transfer structure from an anchor to a pressure receiving plate, and in particular, to a slope stabilization system including an anchor and a pressure receiving plate having a receiving pedestal on which the head of the anchor (anchor head) is mounted. The present invention relates to a load transfer unit structure from an anchor to a pressure receiving plate.

  Conventionally, in order to stabilize slopes (natural slopes and cut soils), anchors are provided by penetrating from the surface of slopes to stable ground, and slopes on the ground surface end of anchors as a reaction force structure of anchor head. We propose a protection structure of slope by combination of so-called anchor and pressure receiving plate which attach a pressure receiving plate made of a concrete block with a cross shape in plan view and a rectangular shape which can widely cover and transmit tension of anchor to the slope via the pressure receiving plate. It had been.

  In a state where tension force is applied to the pressure receiving plate by the anchor, the load is concentrated at the connecting portion of the pressure receiving plate with the anchor, and therefore, stress is concentrated at the connecting portion, which causes breakage of the pressure receiving plate. In particular, in a pressure receiving plate adopting a member having a strength higher than that of other portions in the joint portion, in order to prevent damage to the pressure receiving plate at the boundary portion between the two, transmission of load from the joint portion to the other portion is It is important to optimize.

  Patent Document 1 discloses an invention for optimizing a stress state caused by tension from an anchor at a joint portion of a pressure receiving plate with the anchor.

  Specifically, as shown in FIGS. 8 (A) and 8 (B), Patent Document 1 shows that a substantially cross-shaped concrete pressure receiving plate 80 having four arms is joined to the upper end of the anchor 81. In the upper part 80b of the pressure receiving plate central part 80a, there is disclosed a receiving base 85 made of a steel material provided with a bottom part 86 having a hole 86a for inserting the anchor 81 and a conical tube part 87 tapered downward. An anchor plate (not shown) having a diameter larger than that of the anchor head 88 may be provided between the receiving pedestal 85 and the anchor head 88 that constitute the coupling portion.

  The bottom portion 86 of the receiving pedestal 85 forms a bearing plate that supports the upper end portion of the anchor 81.

  According to the receiving pedestal 85 of Patent Document 1, as shown in FIGS. 8A and 8B, the tension or load from the anchor 81 is transmitted to the receiving pedestal 85 via the bearing disc (bottom portion 86). It is dispersed in a direction (arrow direction) oblique to the axis A of the pressure receiving plate 80 from the conical cylindrical portion 87 of the receiving pedestal 85, that is, in the direction of the arm of the pressure receiving plate 70. As a result, the load is dispersed from the anchor 81 to the receiving pedestal 85 and further from the receiving pedestal 85 to the direction of the sufficiently long arm of the pressure receiving plate 80, which is necessary even if the thickness of the pressure receiving plate in the axis A direction is reduced. A pressure receiving plate capable of handling a load can be configured. Such a configuration having the receiving pedestal 85 is such that when a load is transmitted from the high strength anchor receiving member to the main body (pressure receiving plate 80) of the pressure receiving plate whose strength is relatively reduced, the anchor 81 and the pressure receiving plate Stress concentration at the joints is avoided and is advantageous.

  In addition, when installing the pressure receiving plate on the slope of the earth's slope, there are few cases where the anchor is perpendicular to the bottom surface of the pressure receiving plate, and the range of the crossing angle between the two is generally 90 ° to 105 °. It is.

  When the receiving pedestal 85 of Patent Document 1 is used as it is when the crossing angle between the two deviates from the perpendicular, as shown in FIG. 9, the anchor 81 is bent at the lower end of the anchor head 88, damaging the protective layer or breaking the anchor. There is a possibility that the strength may decrease.

  Therefore, conventionally, when the crossing angle between the two is not perpendicular, as shown in FIG. 10, when manufacturing the pressure receiving plate at the factory, an angle corresponding to the crossing angle between the assumed anchor and the bottom surface of the pressure receiving plate is given. It has been proposed that the receiving pedestal 90 be fitted on the upper surface of the pressure receiving plate.

  However, at an angle, the bottom portion 86 of the receiving pedestal 90 sinks further downward, the thickness of the pressure receiving plate at the lower portion of the receiving pedestal decreases, and the strength of the pressure receiving plate structurally decreases. Further, by setting the angle to the receiving pedestal 90, the dispersion direction of the load from the conical cylinder 87 toward the pressure receiving plate is changed, and the main portion of the relatively low strength pressure receiving plate in the fitting portion of the receiving pedestal 90 is broken. It is also a concern. Furthermore, since the angle adjustment of the receiving pedestal at the time of manufacturing the pressure receiving plate in the factory requires angle adjustment every time of manufacturing, it means that it is limited to order production, and the pressure receiving plate manufacturing cost due to mass production of standard products Make the decline difficult.

  Moreover, even if the crossing angle between the assumed anchor and the bottom of the pressure receiving plate is matched with the fitting angle of the receiving pedestal to the pressure receiving plate, the actual slope may have a difference of both angles by several degrees depending on the condition of the slope. It is common. Since the action of force changes even with a few degrees of deviation, the load dispersion effect as designed may not be obtained.

  Patent Document 2 discloses a pressure receiving plate provided with a ball seat capable of coping with such an angular deviation. Specifically, a convex spherical surface corresponding to a concave spherical seat and a substantially central portion of a pressure receiving plate having a substantially cross-shaped planar view and having a hole through which an anchor is inserted and a substantially hemispherical concave spherical seat formed at the top An anchor head formed as a convex rotating body having a bottom surface thereof, and a steel pressure receiving plate is disclosed.

  According to this, at the installation site of the pressure receiving plate, even when the angle of the anchor is not perpendicular to the bottom surface of the pressure receiving plate and the angle deviates from the vertical, the convex spherical surface of the anchor head is concave Sliding up adjusts the angle and prevents bending of the anchor.

JP-A-11-21886 JP 11-158870 A

  According to the pressure receiving plate of Patent Document 2, although the angle is adjusted by sliding the convex spherical surface of the anchor head on the concave spherical seat, the bending of the anchor is prevented, but the concave spherical seat is adopted. The large load transmitted from the anchor tends to be concentrated to the lower side of the pressure receiving plate via the concave ball seat. That is, when the convex spherical surface and the concave spherical seat of Patent Document 2 are adopted for a pressure receiving plate whose strength of the main body is smaller than the strength of the anchor receiving member, the pressure receiving plate may be damaged in the lower region of the anchor receiving member. I am concerned.

  The present invention has been made in view of the above problems, and an object thereof is to properly disperse a load transmitted from an anchor to the entire pressure receiving plate, and a pressure receiving plate without increasing the time and effort of manufacturing the pressure receiving plate. It is an object of the present invention to provide a compatible load transfer structure from the anchor to the pressure receiving plate by optimizing the angle between the bottom surface and the anchor.

In order to achieve the above object, the invention according to claim 1 is an anchor having a head at an upper end and embedded on a slope of a ground with at least the head exposed, and the anchor head And a concave portion formed on the upper surface thereof so as to be capable of being fitted into the receiving pedestal, and a main body portion receiving tension of the anchor with respect to the ground through the receiving pedestal. And a pressure receiving plate pressed and installed on the slope, in the load transfer portion structure from the anchor to the pressure receiving plate in the slope stabilization system,
At least the compressive strength of the receiving pedestal is set to be larger than the main body portion of the pressure receiving plate, and the anchor head of the inner surface is placed on the side wall having a conical shape whose outer surface tapers in the ground direction. And a bottom wall having a concave spherical surface and having an insertion hole through which the anchor is inserted, and the anchor head has an outer surface facing the inner side surface of the bottom wall of the receiving pedestal. The invention is characterized in that it is formed as a convex spherical surface having substantially the same curvature as the concave spherical surface on the inner surface of the bottom wall portion of the receiving pedestal.

  According to this configuration, the mounting state of the anchor head on the receiving base in a state in which the receiving base is fitted into the recess of the pressure receiving plate main body and the anchor upper end (upper end of the uncurtain don) is coupled to the anchor head. Is a state in which the outer surface of the anchor head, which is a convex spherical surface, can slide on a predetermined region which is a concave spherical surface of the bottom wall inner surface of the receiving pedestal. As a result, at the installation site of the pressure receiving plate on the ground, the angle of the anchor with respect to the bottom surface of the pressure receiving plate when the anchor is attached to the pressure receiving plate can be changed within a predetermined range .

  Furthermore, since a large load transmitted from the anchor to the receiving pedestal can be dispersed to the pressure receiving plate main body through the outer surface of the conical side wall of the receiving pedestal, the connection portion between the pressure receiving plate and the anchor It is possible to avoid the stress concentration in the above, and to reduce the possibility of breakage of the pressure receiving plate main body portion having a compressive strength at least smaller than that of the receiving pedestal at the joint portion.

  The invention according to claim 2 is the load transfer unit structure from the anchor according to claim 1, wherein the insertion hole of the receiving pedestal and the through hole through which the anchor in the main body of the pressure receiving plate passes are: A substantially cylindrical hole extending in a position and direction corresponding to an assumed crossing angle between the anchor and the bottom surface of the main body of the pressure receiving plate when the pressure receiving plate is pressed and installed on the slope of the ground. It is characterized in that it is provided as

  According to this configuration, since the receiving pedestal and the lower region thereof can be densely formed compared to the case where the tapered insertion hole and the through hole are formed, the load on the lower region of the receiving pedestal where stress is easily concentrated is also accurate Can be dispersed in

  The invention according to claim 3 is the load transfer unit structure from anchor to pressure receiving plate according to claim 1 or 2, wherein the outer surface of the side wall of the receiving pedestal and the outer surface of the bottom wall of the receiving pedestal Is characterized in that it forms an angle of 55 ° or more and 65 ° or less.

  According to this configuration, the large load transmitted from the anchor to the receiving pedestal can be most effectively dispersed to the pressure receiving plate main body via the outer side surface of the conical side wall.

  The invention according to claim 4 is the load transfer structure from anchor to pressure receiving plate according to any one of claims 1 to 3, wherein the anchor head has an attachment means with an anchor upper end. It is characterized in that it is a combination of a connecting member and a bottom member having the outer side surface which is the convex spherical surface.

  According to this configuration, the size of the anchor used and the corresponding anchor head differ depending on the anchor force required to stabilize the slope of the mountain, changing only the upper coupling member, and always changing the bottom member It is possible to use the same one.

  Thereby, regardless of the required anchor force, only the upper coupling member is changed, and the function of load distribution and angle optimization is performed without changing the receiving pedestal necessary for angle adjustment and the bottom member of the anchor head. It can be demonstrated.

  According to the structure of the load transfer unit from the anchor to the pressure receiving plate of the present invention, the receiving pedestal is fitted into the recess of the pressure receiving plate main body, and the upper end of the anchor (the upper end of the uncurtain don) is coupled to the anchor head The mounting state of the anchor head on the receiving pedestal is such that the convex outer surface of the anchor head can slide on a predetermined region of the concave spherical surface of the inner surface of the bottom of the receiving pedestal. is there. As a result, at the installation site of the pressure receiving plate on the ground, the angle of the anchor with respect to the bottom surface of the pressure receiving plate when the anchor is attached to the pressure receiving plate can be changed within a predetermined range .

  Therefore, the crossing angle between the bottom of the pressure receiving plate and the anchor can be optimized without increasing the time and effort of manufacturing the pressure receiving plate, and the anchor can be maintained in a substantially linear state at the junction with the upper end of the anchor. Become.

  Furthermore, since a large load transmitted from the anchor to the receiving pedestal can be dispersed to the pressure receiving plate main body through the outer surface of the conical side wall of the receiving pedestal, the connection portion between the pressure receiving plate and the anchor It is possible to avoid the stress concentration in the above, to reduce the possibility of breakage of the pressure receiving plate main body having a strength smaller than that of the receiving pedestal at the joint portion, and it is possible to stabilize the slope more effectively.

(A) It is a top view of the pressure receiving board containing the load transfer part structure 10 from the anchor to the pressure receiving board which concerns on embodiment of this invention, (B) It is an I _B -I _B line sectional view of the figure. FIG. 1 is a cross-sectional view of a slope S of a mountain slope protected by a slope stabilization system 1 having a load transfer structure 10 from an anchor to a pressure receiving plate. It is the a section enlarged view of FIG. It is the same enlarged view as FIG. 3 which shows the 1st modification of the main-body part 4 of the pressure receiving plate 3, and the receiving pedestal 20. FIG. It is an enlarged view similar to FIG. 3 which shows the 2nd modification of the main-body part 4 of the pressure receiving plate 3, and the receiving pedestal 20. FIG. It is sectional drawing similar to FIG. 1 (B) which shows the modification of the anchor head 12. FIG. It is sectional drawing similar to FIG. 1 (B) which shows the further modification of the anchor head 12. FIG. It is a (A) top view which shows the connection part structure with the anchor of the conventional pressure receiving plate, and (B) It is a VIII _B -VIII _B line sectional view of the figure. It is a figure which shows the bending state of the anchor in the conventional connection part structure with the anchor of a pressure receiving plate. It is a figure which shows the connection part structure with the anchor of the pressure receiving plate which made the receiving base incline with respect to the main-body part of the conventional pressure receiving plate.

Next, embodiments of the present invention will be described in detail based on the drawings. 1 (A) is a plan view of the pressure receiving plate including the load transfer structure 10 from the anchor to the pressure receiving plate, FIG. 1 (B) is a cross-sectional view taken along the line I _B -I _{B of} FIG. 3 is a cross-sectional view of the slope S of the earth protected by the slope stabilization system 1 having the load transfer structure 10 from the pressure receiving plate to the pressure receiving plate, and FIG. 3 is an enlarged view of a part in FIG.

  The present invention comprises an anchor 2 having a head (anchor head 12) at an upper end 2a (an upper end of an uncurtained don), a receiving pedestal 20 on which the anchor head 12 is mounted, and a main body into which the receiving pedestal 20 is fitted. A pressure receiving plate 3 having a portion 4; and a load transfer structure 10 from an anchor to a pressure receiving plate in the slope protection system 1.

  As shown in FIG. 2, the anchor 2 is embedded in the slope S of the mountain with the head (the anchor head 12) exposed. The slope S may be, for example, a slope formed by excavating a ground. For example, as shown in FIG. 2, the slope S is formed of a weathered unstable layer G2 (surface portion) of 1 m to 3 m and a stable stratum G1 (stable ground) existing thereunder.

  After the anchor 2 is inserted into the anchor hole 7 drilled in the slope S, cement milk 8 is injected into the anchor hole 7, and the anchor 2 is fixed to the slope S and installed. The diameter φ of the anchor hole 7 is in the range of 60 mm to 200 mm, preferably 80 mm to 140 mm. In this state, the lower end portion 2b of the anchor 2 is fixed to the stable formation G1, and the upper end portion 2a of the anchor 2 is maintained in the state of being exposed to the ground surface.

  As the anchor 2, for example, a ground bolt used in a rock bolt or a ground anchor method corresponds. The anchor 2 can be suitably selected according to the assumed anchor force. For example, a ground anchor is used as the anchor 2 when the assumed anchoring force increases beyond 10 t, and a lock bolt is used as the anchor 2 when the assumed anchoring force is 10 t or less. In the present embodiment, a ground anchor is used as the anchor 2. The pressure receiving plate 3 is attached to the anchor 2.

  The pressure receiving plate 3 mainly includes a main body 4 and a receiving pedestal 20 fitted in a recess 4 a provided at a substantially central portion of the main body 4.

  The main body portion 4 may have any shape as long as it is a plate member which can be tensioned by the anchor 2 and can widely cover the slope, for example, various shapes such as a circle and a polygon in plan view In the present embodiment, one having a substantially cruciform shape in plan view having four arms 4c, 4c, 4c, 4c is used.

  In addition, a substantially cylindrical through hole 4b through which the anchor 2 penetrates is provided at the bottom 4aa of the recess 4a. In the present embodiment, the through hole 4b is formed perpendicularly to the bottom surface 4d of the main body 4, and the angle β between the anchor 2 and the bottom surface 4d of the main body 4 (see FIG. 1B). The inner diameter of the anchor 2 and the peripheral surface of the through hole 4b is not in contact if the vertical angle. ± .2.5.degree.

  The main body 4 is formed using a base material of a material having at least a compressive strength smaller than that of the anchor head 12 and the receiving pedestal 20 described later (that is, the receiving pedestal 20 has at least a compressive strength greater than that of the main body 4). Is set). As such a base material, concrete and resin are mentioned, for example.

  Examples of concrete include precast concrete, prestressed concrete, high strength concrete, reinforced concrete and the like.

  Moreover, as resin, a thermosetting resin is used and it is preferable that it is a thermosetting resin foam from a viewpoint of weight reduction. As the thermosetting resin foam, urethane resin foam, epoxy resin foam, unsaturated polyester resin foam, and melamine resin foam can be used. In particular, it is preferable to use a urethane resin foam.

  In the matrix, fibers may be added for strength. As the fiber, synthetic fiber such as glass fiber, carbon fiber, metal fiber, chemical fiber and the like can be used, but it is preferable to use glass fiber from the viewpoint of strength and cost. That is, when the base material is a resin, it is preferable to use an FRP to which fibers are applied.

  The compressive strength can be measured, for example, in accordance with JIS A 1108. Further, the receiving pedestal 20 may be set to have a bending strength or a tensile strength larger than that of the main body 4. Bending strength can be measured, for example, according to JIS A 1106, and tensile strength can be measured, for example, according to JIS A 1113.

  In the present embodiment, as shown in FIG. 1 (B), the receiving pedestal 20 has a bottomed cylindrical shape in which the inside of the truncated cone is hollowed out, and the outer side surface 21a and the inner side surface 21b are in the ground direction. It has a side wall 21 having a tapered conical shape and a bottom wall 22 having a flat outer surface 22 a.

  The inner surface 22b of the bottom wall portion 22 has a predetermined region which is a concave spherical surface. When the convex spherical surface of the bottom outer surface 14b (see FIG. 2) of the anchor head 12 described later is placed on the inner surface 22b of the bottom wall portion 22, the predetermined region has a concave convex spherical surface. It is defined by whether it can slide on a spherical surface. Specifically, the above-mentioned predetermined area which is a concave spherical surface in a range where the angle β (see FIG. 1B) between the anchor 2 and the bottom surface 4 d of the main body 4 can realize a range of 90 ° (vertical) ± 15 ° Is defined.

  The bottom wall portion 22 also has an insertion hole 22 c through which the anchor 2 is inserted. In the present embodiment, the insertion hole 22c is formed vertically to the bottom surface 4d of the main body 4, and the angle β (see FIG. 4) between the anchor 2 and the bottom surface 4d of the main body 4 is 90. If it is in the range of ± (perpendicular) ± 2.5 °, the anchor 2 has an inner diameter which does not contact the circumferential surface of the insertion hole 22c.

  The angle α between the outer surface 21a of the side wall 21 of the receiving pedestal 20 and the outer surface 22a of the bottom wall 22 (see FIG. 1B) is preferably 55 ° or more and 65 ° or less. If the angle α is less than 55 °, the load may concentrate on the side wall 21 and the side wall 21 itself may be damaged, and the load distribution in the direction of the arm 4 c of the pressure receiving plate 3 may be insufficient. There is also a possibility that the main body 4 of the plate 3 may be damaged in the vicinity of the tip of the arm 4c. Conversely, if the angle α exceeds 65 °, the load distribution in the direction of the arm 4c of the pressure receiving plate 3 through the side wall 21 becomes insufficient, and the load from the anchor 2 moves to the lower side of the bottom wall 22. There is a possibility that the body portion 4 of the pressure receiving plate 3 may be damaged below the bottom wall portion 22.

  The angle α between the outer surface 21a and the outer surface 22a can be defined as an angle at which the straight portions of the outer surface 21a and the outer surface 22a intersect, and the continuous portion of the actual outer surface 21a and the outer surface 22a is The corners may be chamfered or rounded at corners. By rounding the corners of the outer surface 21a and the outer surface 22a, concentration of stress on the portion of the main body 4 of the pressure receiving plate 3 in contact with the corners is alleviated.

  The receiving pedestal 20 has a compressive strength greater than at least the main body 4 of the pressure receiving plate 3. For example, while the base material of the main body 4 of the pressure receiving plate 3 is concrete or resin, the receiving pedestal 20 is made of metal having a strength greater than that of concrete or resin. Such metals include steel, cast iron, aluminum alloys and the like.

  The anchor head 12 is, as shown in FIG. 1B, an upper coupling member 13 (corresponding to a so-called anchor head) having a coupling means (a hook 15) for coupling to the anchor upper end 2a, and a receiving pedestal 20 It is comprised by the combination with the bottom part member 14 (equivalent to what is called an anchor plate) to contact | abut. When the bottom member 14 is used as an anchor plate as in the present embodiment, the bottom member 14 has a diameter larger than that of the top coupling member 13 in plan view from the viewpoint of receiving the load transmitted from the anchor to the top coupling member 13. Become.

  The upper coupling member 13 is a cylindrical shape having flat top and bottom surfaces and a side circumferential surface, and is an anchor hole through which the upper end portion 2a (PC steel wire) of the anchor 2 penetrates in the axial direction of the cylindrical shape. It has 13a. The anchor hole 13a has a shape in which the vicinity of the top surface of the upper joint member 13 is gradually expanded in diameter.

  The bottom member 14 has a substantially convex lens shape or a substantially semicylindrical shape which is downwardly convex in a side view, and has a top surface in surface contact with the bottom surface of the upper coupling member 13 and an inner side surface of the bottom wall portion 22 of the receiving pedestal 20. And 22b, a bottom outer surface 14b having a convex spherical surface having substantially the same curvature as the concave spherical surface.

  The top surface of the bottom member 14 is provided with anchor holes 14c through which all four anchors 2 can pass, and the anchor holes 14c extend to the bottom outer surface 14b.

  The upper coupling member 13 and the bottom member 14 are placed on the inner surface 22b of the bottom wall 22 of the receiving pedestal 20 in a state where the anchor 2 is inserted into the anchor hole 13a and the anchor hole 14c, and a tension jack (shown in FIG. 1) is applied to the anchor 2 by a predetermined tension force, and then the hook 15 (coupling means, see FIG. 1 (B)) is inserted into the anchor hole 13a from the top surface side of the upper coupling member 13. The upper end 2 a is coupled to the anchor head 12.

  Also, by thus inserting the anchor 2 into the anchor holes 13a and 14c, the upper coupling member 13 and the bottom member 14 are connected, and the combination of these forms the anchor head 12, and via the anchor 2 Thus, a predetermined tension necessary for stabilizing the slope S is applied to the pressure receiving plate 3.

  The upper end portion 2a of the anchor 2 exposed to the slope S and the anchor head 12 are not shown in FIG. 2 but are covered by a known head cap after the pressure installation of the pressure receiving plate 3 on the slope S. It is also good. In this case, the interior space of the head cap is preferably filled with a rust-proof material.

  In addition, as shown in FIG. 4, a waterproof plug 26 for preventing water from entering the through hole 4b from the side of the slope S is fitted on the bottom 4d side of the main body 4 in the through hole 4b. Is preferred. Thereby, the penetration of water into the through hole 4 b is prevented, and the corrosion of the anchor head 12 and the receiving pedestal 20 can be suppressed. For example, after the pressure receiving plate 3 is placed on the slope S in a state where the anchor 2 embedded in the slope S of the ground penetrates the through hole 4 b of the main body 4, the waterproof plug 26 is Before being coupled to the anchor 2, the insertion hole 22c and the through hole 4b are sequentially passed through and fitted to the bottom 4d side of the main body 4 in the through hole 4b.

  The waterproof plug 26 is provided with an anchor hole (not shown) corresponding to the position through which the anchor 2 passes, whereby the water from the slope S side into the through hole 4b is inserted while the anchor 2 is inserted. Infiltration can be prevented.

  Further, the waterproof plug 26 is an elastic body such as rubber, and even if the angle β is deviated in the range of about 90 ° ± 2.5 °, the waterproof plug 26 may be made of the anchor 2 and the anchor hole due to the deviation. It is preferable from the viewpoint of maintaining waterproofness while absorbing positional deviation.

  Alternatively, in the installation site of the pressure receiving plate 3, when the angle β deviates in the range of about 90 ° ± 2.5 ° than expected, it is possible to use a waterproof plug in which the position of the anchor hole is adjusted. .

  Therefore, according to the load transfer structure 10 from the anchor to the pressure receiving plate according to the present embodiment, the bottom outer surface 14 b of the anchor head 12 which is a convex spherical surface is the outer surface of the bottom wall 22 of the receiving pedestal 20. It is possible to slide on a predetermined area which is a concave spherical surface 22a.

  Thereby, at the installation site of the pressure receiving plate 3 on the slope S of the ground, as shown in FIG. 4, the angle β between the anchor 2 and the bottom surface 4 d of the main body 4 of the pressure receiving plate 3 is ±± 90 ° Even when the angle is shifted by about 2.5 °, the anchor head 12 is slid on the receiving base 20 according to the angle, and the angle between the bottom 4 d of the main body 4 and the anchor 2 is optimized to anchor 2 It is possible to keep the straight state without bending the

  At the same time, a large load transmitted from the anchor 2 to the receiving pedestal 20 is transferred to the main body 4 of the pressure receiving plate 3 through the outer side surface 21a of the side wall 21 having the conical shape of the receiving pedestal 20, particularly in the direction of the arm 4c. And the stress concentration at the joint of the pressure receiving plate 3 with the anchor 2 is avoided, and the possibility of breakage of the main body 4 having a strength smaller than that of the receiving pedestal 20 is reduced at the joint. There is.

  In addition, since the anchor head 12 is a combination of the upper coupling member 13 and the bottom member 14, only the upper coupling member 13 is changed in accordance with the anchoring force necessary for the stabilization of the slope S of the ground. The load distribution and angle optimization functions can be exhibited without changing the receiving pedestal 20 and the bottom member 14 necessary for adjustment.

  In the above embodiment, although the case where the angle β (see FIG. 2) between the anchor 2 and the bottom surface 4 d of the main body 4 is in the range of 90 ° ± 2.5 ° can be coped with, the angle β is There is a possibility of shifting to the range of 90 ° ± 15 °. Therefore, two modified examples of the main body 4 of the pressure receiving plate 3 and the receiving pedestal 20 that can cope with such a case will be described with reference to FIGS. 5 and 6.

  FIG. 5 is an enlarged view similar to FIG. 4 showing a first modification of the main body 4 of the pressure receiving plate 3 and the receiving pedestal 20. As shown in FIG. In the present modification, the same elements as those in the above embodiment are indicated by the same reference numerals and the description thereof will be omitted.

  As illustrated, in the present modification, the configuration of the through hole 4b 'of the main body 4 and the insertion hole 22c' of the receiving pedestal 20 is different from that of the above embodiment.

  Specifically, in the present modification, the through hole 4b 'has an angle γ of 95 ° between the bottom surface 4b of the main body 4 and the axis L of the through hole 4b', and an angle β of 95 ° ± 2. In the range of 5 °, the anchor 2 and the circumferential surface of the through hole 4b 'are set to have an inner diameter that does not come in contact with each other.

  Here, the axis L is set based on the crossing angle between the anchor 2 assumed and the bottom surface 4 d of the main body 4 of the pressure receiving plate 3 from the situation of the slope S of the mountain where the pressure receiving plate 3 is installed. However, since the actual angle β may deviate by several degrees (about ± 2.5 °) from the intersection angle assumed by the state of the slope S at the time of installation, this is a case where the deviation occurs However, the inner diameter of the through hole 4b 'is set so that the anchor 2 does not abut on the circumferential surface of the through hole 4b'.

  Similarly, in the insertion hole 22c ', if the angle γ between the bottom surface 4d of the main body 4 and the axis L of the insertion hole 22c' is 95 ° and the angle β is in the range of 95 ° ± 2.5 °. The anchor 2 and the circumferential surface of the insertion hole 22c 'are set to have an inner diameter not in contact with each other.

  Furthermore, FIG. 6 is an enlarged view similar to FIG. 4 showing a second modification of the main body 4 of the pressure receiving plate 3 and the receiving pedestal 20. As shown in FIG. In the present modification, the same elements as those in the above embodiment are indicated by the same reference numerals and the description thereof will be omitted.

  As illustrated, in the present modification, the configuration of the through hole 4 b ′ ′ of the main body 4 and the insertion hole 22 c ′ ′ of the receiving pedestal 20 is different from that of the above embodiment.

  Specifically, in the present modification, in the through hole 4b ′ ′, the angle γ between the bottom surface 4b of the main body 4 and the axis L of the through hole 4b ′ ′ is 100 °, and the angle β is 100 ° ± In the range of 2.5 °, the anchor 2 and the circumferential surface of the through hole 4b ′ ′ are set to have an inner diameter not in contact with each other.

  Similarly, in the insertion hole 22c ′ ′, the angle γ between the bottom surface 4d of the main body 4 and the axis L of the insertion hole 22c ′ ′ is 100 °, and the angle β is in the range of 100 ° ± 2.5 °. If it exists, it is set so that it may have an inside diameter of the size which the peripheral surface of anchor 2 and penetration hole 22c '' does not contact.

  Here, when the angle β between the bottom surface 4b of the main body 4 and the anchor 2 deviates from perpendicular to 95 ° (first modification) and 100 ° (second modification), the through hole of the main body 4 or Is 82.5 ° -97.5 ° (including the case where the angle β is further deviated by 2.5 ° from the lower limit 85 ° and the case where the angle β is further deviated by 2.5 ° from the upper limit 95 °), 77.5 If all the ranges from 10 ° to 102.5 ° (including the case where it further deviates from the lower limit of 80 ° by 2.5 ° and the case where it deviates from the upper limit of 100 ° by further 2.5 °) has a tapered shape, The area of the outer surface 22a of the bottom wall 22 which is the load transfer surface 20 is insufficient, and a large space is formed in the lower region of the receiving pedestal 20, and the main body 4 of the pressure receiving plate 3 is broken at the lower portion of the receiving pedestal 20. There was a risk of

  According to the first modification and the second modification of the load transfer structure 10 and the pressure receiving plate 3 from the anchor of the present invention, the through hole of the main body 4 and the insertion hole of the receiving pedestal 20 correspond to the angle β The hole is a substantially cylindrical shape, and the receiving pedestal 20 and the lower region thereof can be formed densely, and the load on the lower region of the receiving pedestal 20 where stress is easily concentrated can be properly dispersed.

  Furthermore, the angle β that can be taken between the anchor 2 and the bottom surface 4 d of the main body 4 can be 87.5 ° to 102.5 ° by properly using the three patterns of the above embodiment, the first modification, and the second modification. It is possible to adjust within the range of 15.degree. The range of 15 ° substantially coincides with the range of 90 ° to 105 ° assumed as the range of the angle β, and this can substantially cover the range that the angle β can take.

  Here, according to the first modified example and the second modified example of the load transfer structure 10 and the pressure receiving plate 3 from the anchor of the present invention, the possible range 90 ° to 105 ° of the angle β is covered. It is also possible to set the angle γ to four stages (90 °, 94 °, 98 °, 102 °) instead of three (90 °, 95 °, 100 °). That is, the pressure receiving plate is prepared in advance to be able to cope with the case where the angle (angle β) between the anchor and the bottom of the main body of the pressure receiving plate is within a predetermined range (for example, 90 ° to 105 °). It may be selected from among a plurality of pressure receiving plates having different crossing angles (angle γ). According to this, the range of each β can be adjusted in the range of ± 2 ° (90 ° ± 2 °, 94 ° ± 2 °, 98 ° ± 2 °, 102 ° ± 2 °), The range that can be taken by the angle β can be almost covered in the range of 16 ° of 104 °.

  In addition, that the angle γ is the above three or four steps means that a large number of standard products of the pressure receiving plate 3 in which the angles of the bottom 4d of the main body 4 and the insertion holes of the main body 4 are set at three or four steps. It means that production is possible. Note that the fact that the angle γ is the above three or four steps is merely an example, and the angle γ may be set in multiple steps within the range in which the present invention can be implemented.

  According to the first and second modified examples, since the through holes 4b 'and 4b' 'are substantially cylindrical and do not have a tapered shape which spreads downward toward the bottom, the angle β is large from 90 ° Even when it is deviated (for example, when it is deviated by 5 ° or more), the waterproof plug 26 easily adheres to the peripheral wall surface of the through holes 4b ′ and 4b ′ ′, and the waterproofness inside the through holes is more reliably maintained can do.

  Moreover, although the anchor head 12 is comprised as a combination with the top coupling member 13 and the bottom member 14 in the said embodiment, it is not restricted to this case.

  FIG. 7 is a cross-sectional view similar to FIG. 1 (B), showing a modified example of the anchor head 12. As illustrated, in the present modification, the anchor head 30 has a bottom outer surface 30a having a convex spherical surface, a cylindrical side circumferential surface 30b, a flat top surface 30c, and a flat top surface 30c from the bottom outside. It is comprised as one member which has the anchor hole 30d penetrated to the side surface 30a.

  Also according to this modification, the angle between the bottom surface 4d of the pressure receiving plate 3 and the anchor 2 is optimized by the interaction between the convex spherical surface of the bottom outer surface 30a and the concave spherical surface of the inner surface 22b of the bottom wall 22 of the receiving pedestal 20. Thus, the effect of the present invention can be exerted, that is, the proper distribution of the load via the outer side surface 21 a of the side wall 21 of the receiving pedestal 20.

  Moreover, FIG. 8 is a cross-sectional view similar to FIG. 1 (B) showing a further modified example of the anchor head 12. As illustrated, in the present modification, the anchor head 40 is a combination of the upper coupling member 13 of the present embodiment, the flat conventional anchor plate 44, and the bottom member 46 having a substantially convex lens shape in a side view. It is good.

  Here, the bottom member 46 has a convex shape having substantially the same curvature with respect to the concave spherical surface of the top surface in surface contact with the bottom surface of the anchor plate 44 and the concave surface of the inner surface 22 b of the bottom wall portion 22 of the receiving pedestal 20. And a bottom outer surface 46b having a spherical surface. Thereby, the effect of the present invention can be exhibited only by adding the bottom member 46 to the combination of the conventional coupling member 13 and the anchor plate 44.

  Furthermore, although the anchor head 12 has been described as including the anchor head coupled to the upper end 2a of the anchor 2 in the present embodiment, the present invention is not limited to the embodiment in which the anchor head separate from the anchor is coupled. . That is, the anchor head may be mounted on the receiving pedestal 20. For example, the upper end 2a of the anchor 2 is made larger than other regions of the anchor 2, and the anchor can be mounted on the receiving pedestal. The head may be formed.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.

  For example, in the above embodiment, the hook 15 is illustrated as a coupling means for coupling to the upper end 2 a of the anchor 2, but the invention is not limited to this. For example, an external thread may be formed at the upper end portion 2a of the anchor 2 and a bolt having an internal thread corresponding to the external thread may be employed as a coupling means.

DESCRIPTION OF SYMBOLS 1 Slope stabilization system 2 anchor 3 pressure receiving plate 4 main-body part 4b, 4b ', 4b''through-hole 10 load-transmission part structure from anchor to pressure-receiving plate 12 anchor head 13 upper joint member 14, 46 bottom member 14b, 46b Bottom outer side (outer side)
15 pieces (combination means)
20 Receiving pedestal 21 side wall 22 bottom wall 22b, 22b ', 22b''insertion hole

Claims (4)

An anchor having a head at an upper end portion and being buried on a slope of a mountain with at least the head exposed;
A receiving pedestal on which the anchor head is mounted, and a concave portion formed on the upper surface so as to be capable of receiving the receiving pedestal, the main body receiving tension of the anchor with respect to the ground through the receiving pedestal; A pressure receiving plate pressed and installed on the slope;
In the load transfer structure from the anchor to the pressure receiving plate in the slope stabilization system comprising:
The receiving pedestal is
At least the compressive strength is set larger than the main body of the pressure receiving plate,
The side wall portion having an outer side surface having a conical shape tapered in the direction of the ground, the region where the anchor head of the inner side is placed is formed as a concave spherical surface and has an insertion hole through which the anchor is inserted. And a bottom wall portion,
The anchor head is
An outer surface opposite to the inner surface of the bottom wall of the receiving pedestal is formed as a convex spherical surface having substantially the same curvature with respect to a concave spherical surface of the inner surface of the receiving pedestal. Load transfer structure from anchor to pressure plate.   The insertion hole of the receiving pedestal and the through hole through which the anchor penetrates in the main body portion of the pressure receiving plate are respectively the anchor and the main body portion of the pressure receiving plate when the pressure receiving plate is pressed against the slope of the ground. A load transfer structure from an anchor to a pressure receiving plate according to claim 1, provided as a substantially cylindrical hole extending in a position and an orientation corresponding to an assumed crossing angle with the bottom surface of the frame.   The pressure from the anchor according to claim 1 or 2, wherein an angle between the outer surface of the side wall of the receiving pedestal and the outer surface of the bottom wall of the receiving pedestal is 55 ° or more and 65 ° or less. Load transfer structure to the plate.   The anchor head is a combination of an upper coupling member having a coupling means with an anchor upper end and a bottom member having the outer side surface which is the convex spherical surface. Load transfer part structure from the anchor in any one of Claim 1 to pressure receiving board.

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