JP2009221663A - Pressure receiving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extremely user-friendly pressure device capable of easily and accurately absorbing the gap between a ground and an anchor member due to the subsidence of the ground irrespective of the size of the gap. <P>SOLUTION: This pressure receiving device comprises a fastening nut 5 screwed with the head of the anchor member 1 projecting upward with the insertion part of a pressure retaining plate 3 interposed therebetween, an upper supporting member 13 attached to the upper part of the anchor member 1, and a torsional coiled spring 11 installed between the fastening nut 5 and the upper supporting member 13. The ends of the torsional coiled spring 11 on both sides are engaged with the fastening nut 5 and the upper supporting member 11, respectively. Since the fastening nut 5 is rotated by the torsional restoring force of the torsional coiled spring 11, the gap between the ground 2 and the anchor member 1 can be absorbed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pressure receiving device for an anchor used for stabilizing a slope such as a natural ground. That is, the tensile force acting on the anchor member composed of rock bolts, PC steel wires, PC steel strands, uncurtain dongs using deformed PC steel bars, etc. is transmitted to the ground side to stabilize the slope. The present invention relates to a pressure receiving device for an anchor. In particular, a pressure receiving device improved so as to absorb a gap generated between the ground side and the anchor member side, such as between a bearing plate on the ground and a tightening nut screwed to the anchor member due to ground subsidence, etc. About.

In this type of pressure receiving device, an elastic means such as a coil spring is interposed between a nut and a bearing plate screwed to a male screw formed on the outer peripheral surface of the head of the anchor member so as to press the bearing plate to the ground side. What was comprised in this is known (patent document 1). However, in the case of this prior art, when the ground side sinks due to some reason such as snow melting, the supporting plate descends by the urging force of the elastic means, and the gap between the ground side and the anchor member side follows. Although effective in suppressing the generation, the urging force of the elastic means decreases as the bearing plate descends, and the drag force when an external force that is relatively upward acts on the ground side for some reason is weakened. For this reason, there is a risk that the ground side cannot accurately prevent the slope from collapsing while pushing up the bearing plate upward.
Japanese Patent No. 3516091

Then, while configuring to press the bearing plate to the ground side by interposing an elastic means such as a disc spring between the nut and the bearing plate screwed to the male screw formed on the outer peripheral surface of the anchor member head, Separately, another nut is provided on the upper part of the bearing plate, and the nut is urged to rotate downward by a spring, etc., so that a gap generated between the ground side and the anchor member side is always maintained. Also configured to be able to absorb and to receive strong movement against the upward movement of the ground by receiving the upward movement of the ground directly with the anchor member via the nut It has been developed (Cited document 2). However, in the case of this conventional technology, a nut for preventing the upward movement of the bearing plate is installed separately from the tightening nut and the gap absorbing elastic mechanism, and the spring is attached to the nut. Since it must be installed in a rolled-up state, the structure is complicated, and there is a great difficulty in installation space and installation work. In addition, due to the structure of the mainspring spring, how to take into account the problem of functional degradation due to corrosion caused by the use of thin spring materials and the reaction force of the rotational biasing force of the mainspring spring acting on the bearing plate There was also a technical problem. Furthermore, in order to cope with the assumed gap size, the rotation angle of the nut also increases, and there is a troublesome problem that a large-diameter spring is required.
JP 2002-339356 A

  In view of the above-described conventional technical situation, the present invention can easily and accurately absorb the gap generated between the ground side and the anchor member side regardless of the size of the gap, and is extremely easy to use. An object is to provide a pressure receiving device.

  In the present invention, in order to solve the above-described problem, a tightening nut screwed into the head of the anchor member protruding upward through the insertion portion of the bearing plate, and an upper support member installed on the upper portion of the anchor member, And a torsion coil spring installed between the tightening nut and the upper support member, and the respective end portions on both sides of the torsion coil spring are respectively engaged with the tightening nut and the upper support member. The technical means of absorbing the gap generated between the ground side and the anchor member side by rotating the tightening nut by the torsional restoring force of the torsion coil spring was adopted. The upper support member of the torsion coil spring may be any member that can be locked to the upper end portion of the torsion coil spring and prevent its rotation. For example, the upper support member of the torsion coil spring is screwed into the upper portion of the anchor member. An upper support nut configured to be able to be locked and a lock nut that prevents rotation of the upper support nut can be used.

According to the present invention, the following effects can be obtained.
(1) The gap generated between the ground side and the anchor member side can be accurately absorbed by the rotation of the tightening nut itself due to the torsional restoring force of the torsion coil spring, and the screwing portion between the tightening nut and the anchor member Since the upward movement of the bearing plate is accurately prevented by the frictional resistance, a simple structure absorbs the gap between the ground side and the anchor member side caused by ground subsidence, etc. Stabilization can be realized more accurately.
(2) By simply setting the number of twists of the torsion coil spring according to the size of the gap assumed between the anchor member side and the ground side, it is possible to easily cope with the gap regardless of the size of the gap. Can do. In addition, since the torsion coil spring is employed, the troublesome structural restrictions derived from the increase in the outer diameter of the spring can be eliminated as in the case of using the conventional spring.

  The present invention is used for stabilization of slopes of natural grounds, etc., and uses an anchor member composed of a rock bolt, a PC steel wire, a PC steel strand, an uncurtain dong using a deformed PC steel rod, or the like. It can be widely applied as a pressure receiving device. With regard to the torsion coil spring, as long as it has a form that can accurately absorb the gap generated between the anchor member side and the ground side due to ground subsidence, etc. It is not restricted. In addition, with respect to the upper support member of the torsion coil spring, for example, a support member having an appropriate locking part that can be locked to the upper end of the torsion coil spring is directly fixed to the anchor member, For example, an upper support nut that is screwed onto the upper portion of the anchor member and a lock nut that prevents rotation of the upper support nut may be used.

  1 to 4 are work explanatory views showing a procedure for installing a pressure receiving device according to one embodiment of the present invention. FIG. 5 to FIG. 9 are parts explanatory views showing the parts used in the embodiment in an enlarged manner. In the figure, reference numeral 1 denotes an anchor member which is embedded in a state of being fixed to the ground 2 and is installed in a state where the head protrudes upward through an insertion portion formed in the bearing plate 3 as shown in FIG. The A clamping nut 5 is screwed onto the head of the anchor member 1 protruding upward from the bearing plate 3 with a spherical washer 4 installed on the upper surface of the bearing plate 3 interposed therebetween. As shown in FIGS. 5 and 6, the tightening nut 5 is internally formed with a female screw 6 that can be screwed into a male screw formed on the outer peripheral surface of the head of the anchor member 1. A tool hanging portion 7 is formed. A convex spherical surface 8 is formed on the lower surface of the tightening nut 5 and is configured to be tightened in a state of being engaged with the concave spherical surface formed on the spherical washer 4. Furthermore, an annular groove 9 that opens upward is formed in the lower outer peripheral portion of the tool hook 7 and an appropriate number of locking holes 10 are formed in the bottom of the groove 9. As shown in FIG. 9, the lower portion of the torsion coil spring 11 is supported in the groove portion 9 with the engagement portion 12 formed in a bent state at the lower end of the torsion coil spring 11 inserted and locked. It is configured.

  The upper part of the torsion coil spring 11 is supported by an upper support member 13 as shown in FIGS. As shown in FIGS. 7 and 8, the upper support member 13 is internally formed with a female screw 14 that can be screwed into a male screw formed on the outer peripheral surface of the head of the anchor member 1, and a hexagonal shape on the outside. A tool hook portion 15 is formed. An annular groove 16 that opens downward is formed in the lower outer peripheral portion of the tool hook 15 of the upper support member 13, and an appropriate number of locking holes 17 are formed at the bottom of the groove 16. As shown in FIG. 9, the upper portion of the torsion coil spring 11 is inserted into the upper end portion of the torsion coil spring 11 and the upper end portion of the torsion coil spring 11 is engaged with the groove portion 16. It is comprised so that it may support in.

  Therefore, when installing the pressure receiving device according to the present embodiment, as shown in FIG. 1, first, the anchor member 1 is placed at a predetermined position of the ground 2 through an insertion portion whose head is formed on the bearing plate 3. Install in a state protruding upwards. Then, a tightening nut 5 is screwed onto the head of the anchor member 1 projecting upward from the bearing plate 3 with a spherical washer 4 placed on the upper surface of the bearing plate 3 interposed therebetween, thereby fixing the anchor member 1 to a predetermined position. Tighten with torque. Thereafter, as shown in FIGS. 1 and 2, the torsion coil spring 11 is externally fitted to the anchor member 1 and the lower portion thereof is engaged with the groove portion 9. At that time, the locking portion 12 formed at the lower end of the torsion coil spring 11 is inserted into the locking hole 10 formed at the bottom of the groove 9 to be locked.

  Next, as shown in FIGS. 2 and 3, the upper support member 13 is screwed into the anchor member 1 from above the torsion coil spring 11, and the annular groove 16 formed in the upper support member 13. Is screwed to engage with the upper part of the torsion coil spring 11. At that time, the locking portion 18 formed at the upper end of the torsion coil spring 11 is inserted into the locking hole 17 formed at the bottom of the groove 16 and locked. Thereafter, in a state where the locking portions 12 and 18 at both ends of the torsion coil spring 11 are locked in the locking holes 10 and 17, respectively, the upper support member 13 is further tightened to the state shown in FIG. As shown in FIGS. 3 and 4, the work is completed by tightening with the lock nut 19 to prevent the upper support member 13 from loosening. Incidentally, the specific configuration such as the length of the torsion coil spring 11 depends on the size of the gap generated between the ground 2 side and the anchor member 1 side, which is assumed due to the subsidence of the ground 2, and at least the head of the anchor member 1. Based on the pitch of the male screw formed on the outer periphery, the torsional rotational speed necessary to absorb the gap is obtained, and the torsional rotational speed and the torsion of the torsion coil spring 11 necessary for the rotation of the tightening nut 5 are obtained. The decision will be made with a margin based on the magnitude of the restoring force.

  As described above, in the pressure receiving device according to the present embodiment, the engaging portions 12 and 18 at both ends of the torsion coil spring 11 are provided in the engaging hole 10 provided in the tightening nut 5 and the upper support member 13, respectively. In the state of being locked in the stop hole 17, for example, the state shown in FIG. 4 is tightened, and the torsion coil spring 11 is installed in a state where the required number of rotations is screwed. When the pressure plate 3 descends relative to the anchor member 1, the gap formed between the ground 2 side and the anchor member 1 side due to rotation of the tightening nut 5 by the torsional restoring force of the torsion coil spring 11. Will be absorbed. In the present embodiment, the locking holes 10 and 17 penetrating the bottoms of the grooves 9 and 16 are provided, and the locking parts 12 and 18 formed at the end of the torsion coil spring 11 are inserted and locked. Although the locking means is adopted, the installation positions of the groove portions 9 and 16 are changed to be provided inside the tool hook portions 7 and 15, or the groove portions 9 and 16 are stopped to form the locking holes 10 and 17 in the flat portion. Or, instead of the locking holes 10 and 17, a bottomed hole portion into which the locking portions 12 and 18 can be fitted is employed, or the locking holes 10 and 17 and the hole portions are not provided. In addition, it is possible to employ a stepped portion that the end portion of the torsion coil spring 11 is locked.

It is work explanatory drawing which showed the procedure of the installation work of one Example of this invention. It is work explanatory drawing which showed the procedure of the installation work of the Example. It is work explanatory drawing which showed the procedure of the installation work of the Example. It is work explanatory drawing which showed the procedure of the installation work of the Example. It is the one side sectional view which expanded and showed the clamping nut used for the Example. It is the top view which showed the clamping nut. It is the one side sectional view which expanded and showed the upper support member used for the example. It is the top view which showed the same upper supporting member. It is the front view which expanded and showed the torsion coil spring used for the Example.

Explanation of symbols

  1: anchor member, 2: ground, 3: bearing plate, 4: spherical washer, 5: tightening nut, 6: female screw, 7: tool hook, 8: convex spherical surface, 9: groove, 10: locking hole 11: Torsion coil spring, 12: Locking part, 13: Upper support member, 14: Female screw, 15: Tool hook part, 16: Groove part, 17: Locking hole, 18: Locking part, 19: Locking nut

Claims (2)

  A tightening nut screwed into the head of the anchor member protruding upward through the insertion portion of the bearing plate, an upper support member installed on the upper portion of the anchor member, and the tightening nut and the upper support member; A torsion coil spring installed between the two ends of the torsion coil spring, the end portions on both sides of the torsion coil spring being locked to the clamping nut and the upper support member, respectively, and the tightening restoring force of the torsion coil spring. A pressure receiving device configured to absorb a gap generated between a ground side and an anchor member side by rotating an attached nut.   The upper support member of the torsion coil spring includes an upper support nut that is screwed onto the upper portion of the anchor member and a lock nut that prevents rotation of the upper support nut. Pressure receiving device.

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