JP5078481B2 - Foot metal fixture fixing strength inspection jig and fixing strength inspection method using this jig - Google Patents

Description

  The present invention relates to a foot bracket fixing strength inspection jig used when inspecting a tensile fixing strength of a foot bracket fixed to a peripheral wall of a manhole, and a fixing strength inspection method using the jig.

  The manhole is open to the ground so that workers can enter and exit to inspect and clean the sewage pipes. A deep manhole is provided in a state in which a plurality of leg metal fittings for an operator to move up and down are fixed to a peripheral wall inside the manhole. This leg metal fitting is known to be formed in a U shape in plan view, and is fixed in a state where a pair of leg portions at both ends of the leg metal fitting are embedded in the peripheral wall of the manhole.

  Such a foot metal is easily corroded when hydrogen sulfide gas or the like is generated in the manhole, and the fixing strength is lowered when a long time has passed since installation. In this way, when the strength of the footrest is lowered, if the operator puts his / her foot on the footrest whose strength has been lowered and moves up and down in the manhole, there is a risk that the foot will fall off the foot. Therefore, Patent Document 1 proposes a manhole diagnostic apparatus for maintaining and managing the state of the footrest in a good state.

  As shown in FIG. 9A (perspective view), the manhole diagnostic apparatus 80 has three leg portions 81 each having a screw rod whose height can be adjusted, and a desired height position by these leg portions 81. A pedestal 82 to be held, a traction fitting 83 disposed in the center of the pedestal 82, a load meter 84 for detecting the magnitude of a load applied by the traction fitting 83, and the load meter 84 A displacement meter 85 that detects the amount of displacement of the inspection object when a load is applied, and a load meter 84 and a display meter 86 that displays a detection value detected by the displacement meter 85 are provided.

  When a tensile test is performed by the manhole diagnostic device 80, as shown in FIG. 9B (perspective view), the pedestal 82 is placed sideways so that the legs 81 are orthogonal to the peripheral wall 77 of the manhole. In this state, the connecting portion 83 a of the traction metal fitting 83 is connected to the foot bracket 73. The zero point of the displacement meter 85 is set with the detector of the displacement meter 85 arranged in the vicinity of the connected foot bracket 73 engaged with the foot bracket 73. Then, when a predetermined tensile force is applied to the foot metal object 73 and the foot metal object 73 is displaced so as to be pulled out from the peripheral wall 77, this displacement amount is measured by the displacement meter 85 and displayed on the display meter 86. .

JP 9-316905 A

  The screw rod constituting the leg portion of this conventional manhole diagnostic apparatus has a relatively small diameter and the surface of the tip portion is not processed into a flat surface and remains a rough surface having irregularities. On the other hand, the peripheral wall of the manhole is curved in an arc shape. For this reason, even if the tip of the screw rod hits the peripheral wall of the manhole, the entire surface does not come into contact with the peripheral wall and is in a piece-by-piece state. Also, when measuring the tensile strength of the foot bracket fixed to the peripheral wall of the manhole inclined in the vertical direction, the tip of any of the three screw rods is brought into contact with the peripheral wall extending in the vertical direction, and the other screw rods When the length of the screw rod is adjusted so that the tip portion contacts the obliquely inclined peripheral wall, the one-side contact state of the tip portion of the screw rod that contacts the inclined peripheral wall is further deteriorated. In addition, when the length of the screw rod is adjusted so that all three screw rods abut against the obliquely inclined peripheral wall, the screw rod is arranged substantially parallel to the extending direction of the foot metal fitting, but the peripheral wall is inclined Since it is tilted, the one-side contact state of the tip portions of all the screw rods becomes a worse state. For this reason, in the conventional manhole diagnostic device, the support of the load meter provided on the gantry is in an unstable state, the extension position of the traction bracket with respect to the foot bracket is shifted, and the tensile fixing strength with respect to the peripheral wall of the foot bracket is increased. There was a problem that there was a possibility that it could not be measured accurately.

  The present invention has been proposed in order to respond to such problems, and a foot bracket fixing strength inspection jig capable of accurately measuring the tensile fixing strength of the foot bracket with respect to the peripheral wall and fixing using the same. An object is to provide a strength inspection method.

  In order to solve such a problem, the present invention has the following features. One of the features is an anchorage fixing strength inspection jig used when inspecting the tensile fixing strength of the footrest fixed to the peripheral wall of the manhole, and is inserted into the manhole from the upper opening of the manhole. An insertable gantry part and a pair of legs that are provided at a predetermined interval on the gantry part and extend substantially parallel to each other on one side of the gantry part so as to be stretchable and straddle the leg hardware And a hydraulic cylinder that is provided on a base between the pair of legs and that can be attached to the tip of the foot and can be attached to the tip of the foot by pulling the foot of the foot. And a contact plate that can be contacted along the circumferential direction of the peripheral wall of the manhole.

  According to this feature, a pedestal portion that can be inserted into the manhole, and provided on the pedestal portion, extend substantially parallel to each other on one side of the pedestal portion, and are extendable and disposed so as to straddle the footrest. A pair of legs, a hydraulic cylinder that is provided on a frame between the pair of legs and connects the latching part to pull the foot metal, and is provided at the tip of the leg so as to be freely rotatable. Adjusting the length of the pair of leg parts when inspecting the tensile fixing strength of the footrest fixed to the peripheral wall of the manhole extending in the vertical direction by providing a contact plate that can be contacted along the peripheral direction In this state, when the contact plate provided at each tip portion is abutted against the peripheral wall extending in the vertical direction in a state of extending in the horizontal direction, the contact plate rotates in the peripheral direction of the peripheral wall and contacts along the peripheral wall. In addition, when inspecting the tensile fixing strength of the leg hardware provided on the peripheral wall inclined obliquely in the vertical direction, the length of the pair of leg parts is adjusted and provided at the tip part of one leg part. The contact plate is abutted against the peripheral wall extending in the vertical direction with the contact plate extended in the horizontal direction, and the contact plate provided at the tip of the other leg is abutted against the obliquely inclined peripheral wall in the state extended in the horizontal direction. These contact plates rotate in the circumferential direction of the corresponding peripheral wall and contact along the peripheral wall. Furthermore, when the length of the pair of leg portions is adjusted, when both of the contact plates provided at the respective distal end portions of the pair of leg portions are pushed against the obliquely inclined peripheral wall in a horizontally extended state, these The contact plate rotates in the circumferential direction of the peripheral wall and contacts along the peripheral wall. For this reason, the contact plate has a relatively large area and can contact the peripheral wall without regard to the inclined state of the peripheral wall to which the foot metal fitting is fixed. Accordingly, the pedestal portion can be stably supported by the pair of legs, and the hydraulic cylinder can be disposed in substantially the same direction as the extending direction of the legs provided at both ends of the foot metal, and as a result, the foot metal. It is possible to accurately inspect the tensile fixing strength of the peripheral wall of the object.

  One of the features is that the hydraulic cylinder has a cylinder tube arranged on the opposite side of the leg with the pedestal at the center, and is movable in the same direction as the extending direction of the leg with respect to the pedestal. The cylinder rod supported and extending from the cylinder tube is fixed to the gantry part, and the latching part is connected to the cylinder tube via a connecting member and is arranged on the leg side with respect to the gantry part.

  According to this feature, the cylinder tube of the hydraulic cylinder is disposed on the opposite side of the leg with the pedestal as the center, and is supported to be movable in the same direction as the extending direction of the leg with respect to the pedestal. When the relative position of the cylinder tube with respect to the gantry is changed by fixing the cylinder rod to the gantry and connecting the latching part via the linking member connected to the cylinder tube, the cylinder rod is connected via the linking member. The latching portion thus moved moves in the same direction as the moving direction of the cylinder tube. For this reason, with a movement of a cylinder tube, a latching | locking part can be moved to the position which approached with respect to the mount part, and the position which left | separated. For this reason, when the leg portion is in the extended state, the cylinder tube can be moved closer to the gantry side, and when the leg portion is in the contracted state, the cylinder tube can be moved to a position away from the gantry. For this reason, it is possible to finish the preparation work of the foot bracket fixing strength inspection jig simply by adjusting the position of the latch portion according to the expansion and contraction state of the leg portion, and the latch portion is latched on the foot bracket. Workability of work can be improved.

  One of the characteristics is that the surface of the contact plate is provided with unevenness for increasing the frictional resistance with the peripheral wall of the manhole.

  According to this feature, the surface of the contact plate is provided with irregularities that increase the frictional resistance with the peripheral wall of the manhole, whereby the frictional resistance of the contact plate with respect to the peripheral wall can be further increased. It is possible to reliably prevent the tip end portion of the leg portion from being displaced from the peripheral wall during pulling, and to more accurately inspect the tensile fixing strength of the footrest on the peripheral wall.

  Also, one of the features is a pedestal portion that can be inserted into the manhole, and provided at a predetermined interval in the pedestal portion, and extend substantially parallel to each other on one side of the pedestal portion, and can be expanded and contracted. A cylinder rod in which a cylinder tube is supported by a pair of legs arranged so as to straddle a fixed leg metal fitting, and a frame between the pair of legs so as to be movable in substantially the same direction as the extending direction of the legs. A hydraulic cylinder that is fixed to the pedestal and that can be hooked to the foot bracket is movably provided in conjunction with the cylinder tube to pull the foot bracket, and is provided rotatably at the tip of the leg. And a contact plate that can be contacted along the circumferential direction of the peripheral wall of the manhole, and a foot bracket fixing strength inspection jig for inspecting the tensile fixing strength of the foot bracket against the peripheral wall by pulling the foot bracket with a hydraulic cylinder. With the fixed strength inspection method used Thus, the hydraulic cylinder tube is moved to a position away from the gantry and the latch is moved to a position close to the gantry. The hydraulic oil is supplied to the bottom side oil chamber of the cylinder, the cylinder tube is moved in a direction away from the gantry portion with respect to the cylinder rod, and the footrest is pulled through the latching portion.

  According to this feature, in the state in which the cylinder tube of the hydraulic cylinder is moved to a position away from the gantry and the latching part is moved to a position close to the gantry, the latch is latched on the latching part. Then, supply the hydraulic oil to the bottom oil chamber of the hydraulic cylinder, move the cylinder tube to the cylinder rod in the direction away from the gantry, and pull the foot bracket via the latch, The leg metal fitting can be pulled in a state in which the latching portion is moved to a position close to. For this reason, when the length of the pair of leg portions is adjusted to a short length, the cylinder tube is moved in a direction away from the gantry portion, and the latching portion is moved to a position close to the gantry portion. It is possible to inspect the tensile fixing strength with respect to the peripheral wall of the footrest with little adjustment of the length of the pair of leg portions, and improve the workability of the preparation work for performing the fixing strength inspection of the footrest. be able to.

  Also, one of the features is a pedestal portion that can be inserted into the manhole, and provided at a predetermined interval in the pedestal portion, and extend substantially parallel to each other on one side of the pedestal portion, and can be expanded and contracted. A cylinder rod in which a cylinder tube is supported by a pair of legs arranged so as to straddle a fixed leg metal fitting, and a frame between the pair of legs so as to be movable in substantially the same direction as the extending direction of the legs. A hydraulic cylinder that is fixed to the pedestal and that can be hooked to the foot bracket is movably provided in conjunction with the cylinder tube to pull the foot bracket, and is provided rotatably at the tip of the leg. And a contact plate that can be contacted along the circumferential direction of the peripheral wall of the manhole, and a foot bracket fixing strength inspection jig for inspecting the tensile fixing strength of the foot bracket against the peripheral wall by pulling the foot bracket with a hydraulic cylinder. With the fixed strength inspection method used In the state where the cylinder tube of the hydraulic cylinder is moved to a position close to the gantry and the latching part is separated from the gantry, the foot metal is latched on the latching part, and the bottom side of the hydraulic cylinder The hydraulic oil is supplied to the oil chamber, the cylinder tube is moved in a direction away from the gantry portion with respect to the cylinder rod, and the footrest is pulled through the latching portion.

  According to this feature, in a state where the cylinder tube of the hydraulic cylinder is moved to a position close to the gantry and the latching portion is separated from the gantry, the foot metal is latched on the latching portion, and the hydraulic cylinder The hydraulic oil is supplied to the bottom side oil chamber, the cylinder tube is moved in the direction away from the gantry with respect to the cylinder rod, and the foot metal is pulled through the latching part, so that the position is separated from the gantry. The leg metal fitting can be pulled with the latching portion being moved. For this reason, when the length of the pair of leg portions is adjusted to be long, if the cylinder tube is moved in a direction approaching the gantry portion and the latching portion is moved away from the gantry portion, It is possible to inspect the tensile fixing strength against the peripheral wall of the foot bracket with little adjustment of the leg length of the leg, and to improve the workability of the preparatory work for performing the fixing strength inspection of the foot bracket Can do.

  According to the foot bracket fixing strength inspection jig and the fixing strength inspection method using this jig according to the present invention, the above-mentioned features enable the foot fixing hardware to accurately measure the tensile fixing strength with respect to the peripheral wall. A latch fixing strength inspection jig and a fixing strength inspection method using this jig can be provided.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a foot bracket fixing strength inspection jig and a fixing strength inspection method using the jig according to the present invention will be described below with reference to FIGS. First, before explaining the fixing strength inspection method using the foot metal fixing strength inspection jig of the present invention, the foot metal fixing strength inspection jig will be described. The present embodiment will be described by taking as an example a case where a tensile fixing strength is inspected with respect to a peripheral wall of a footrest fixed to a manhole communicating with a sewer pipe. For convenience of explanation, the following description will be made assuming that the directions of arrows shown in FIG.

  As shown in FIG. 1, FIG. 2 (a) (plan view), FIG. 2 (b) (side view), and FIG. A pair of leg portions 20, 20 provided at both upper and lower end portions of the gantry portion 10, and a gantry portion 10 between the pair of leg portions 20, 20, and a foot metal fitting at the tip portion The hydraulic cylinder 30 is provided with a latching portion 45 that can be latched and pulls a leg metal fitting, and a contact plate 50 that is rotatably provided at the distal ends of the pair of leg portions 20, 20. The 6B (plan view) will be further described. The footrest 73 is provided on both sides of the footrest 73a and the footrest 73a. It has a pair of leg portions 73b extending in a direction substantially orthogonal thereto.

  The gantry 10 has a size that can be inserted into the manhole 76 from the upper opening of the manhole 76, is formed in a flat plate shape and extends in the vertical direction, and the upper and lower ends of the gantry body 11 on both the left and right sides. The flange part 13 is formed extending over the front and rear direction, and the strength of the gantry body part 11 is enhanced by the flange part 13. A pair of insertion holes 11a for inserting a screw block 61 for movably supporting the pair of leg portions 20 and 20 are provided on both upper and lower sides of the gantry main body 11, and left and right of the upper and lower intermediate portions of the gantry main body 11. On both sides, a pair of sliding holes 11b are provided through which a connecting shaft 42 that connects the cylinder tube 31 and the latching portion 45 of the hydraulic cylinder 30 is slidably inserted. A pair of eyebolts 14 are screwed on the left and right sides of the upper end of the gantry 10 so that the footrest fixing strength inspection jig 1 can be suspended via the eyebolts 14.

  The leg portion 20 includes a screw rod 21. As shown in FIG. 3 (a) (cross-sectional view), FIG. 3 (b) (cross-sectional view), and FIG. 4 (disassembled perspective view), the threaded rod 21 is formed with a male screw portion 21a on the base end side, A positioning groove 21b is provided from the proximal end portion to the distal end portion. A contact plate 50 is rotatably attached to the tip of the screw rod 21 via a pin 51.

  A delivery mechanism 60 that feeds the screw rod 21 back and forth with respect to the gantry 10 is attached to the base end of the screw rod 21. The delivery mechanism unit 60 includes the above-described screw block 61 inserted into the insertion hole 11a, the movement restriction ring 64 screwed to the front side of the screw block 61, and the screw block 61 and the movement restriction ring 64. A nut 66 to be sandwiched and a nut cover 68 fixed to the tip of the nut 66 are provided.

  The screw block 61 is formed in a cylindrical shape, and is provided with a through-hole 61a into which the screw rod 21 can be inserted. The screw block 61 abuts against the side surface of the gantry main body 11 of the gantry 10 at the intermediate portion in the axial direction. An annular step 61b is provided for positioning the screw block 61 in the forward direction. On the upper part of the stepped portion 61b, there is provided a female screw portion 61c that communicates with the through hole 61a and is screwed with a positioning bolt 62. A cylindrical fitting portion 61d that is fitted into the insertion hole 11a of the gantry 10 is formed on the front side of the step portion 61b, and a male screw portion 61e is formed on the outer peripheral surface on the distal end side of the fitting portion 61d. Yes. When the fitting portion 61 d of the screw block 61 is fitted into the insertion hole 11 a of the gantry 10 and the stepped portion 61 b is brought into contact with the side surface of the gantry main body 11, the male screw 61 e protrudes from the gantry main body 11. It is configured. The screw block 61 is inserted into the insertion hole 11a, and the pedestal portion is in a state having a desired angle with respect to the pedestal portion 10 by fastening of an angle positioning bolt 63 screwed into the upper portion of the pedestal portion 10. 10 is fixed.

  The nut 66 is formed in a cylindrical shape and has a through hole 66a into which the screw rod 21 can be inserted. An annular flange portion 66b protruding in the radial direction is formed at the rear end portion of the nut 66. The flange portion 66b abuts against the movement restricting ring 64 and restricts the movement of the nut 66 toward the front side. A connection hole 66 c for integrally connecting the nut cover 68 with a pin 69 is provided at the front end portion of the nut 66.

  The movement restricting ring 64 is formed in a cylindrical shape, and has a through hole 64a through which the screw rod 21 can be inserted. A female screw part 64b that can be screwed into the male screw part 61e of the screw block 61 is formed on the inner surface of the rear side. An annular stepped portion 64c that protrudes inwardly and can abut on the flange portion 66b of the nut 66 is provided at the front end portion. The inner diameter of the stepped portion 64 c is slightly larger than the outer diameter of the nut 66. For this reason, when the nut 66 is inserted into the screw rod 21 and the movement restricting ring 64 is screwed onto the male screw portion 61e of the screw block 61 in a state where the rear end portion of the nut 66 is in contact with the front end portion of the screw block 61, The step portion 64c of the movement restricting ring 64 moves to the vicinity of the front side of the flange portion 66b of the nut 66 to restrict the movement of the nut 66 toward the front side. When the movement restricting ring 64 is screwed onto the male thread portion 61e of the screw block 61, the distal end portion of the movement restricting ring 64 comes into contact with the side surface of the gantry main body 11, and the stepped portion 64c is a flange portion of the nut 66. 66b is arranged in the vicinity of 66b. For this reason, when the nut cover 68 rotates, the nut 66 also rotates together with the nut cover 68.

  The nut cover 68 includes a hexagonal portion 68a formed on the front side in a hexagonal shape in a side view and a circular portion 68b formed on the rear side in a cylindrical shape. The hexagonal portion 68a is used when the nut cover 68 is rotated using a tool such as a spanner, and the circular portion 68b is used when the operator rotates the nut cover 68 by hand. A through hole 68c through which the screw rod 21 can be inserted is provided inside the nut cover 68, and a female screw portion 68d that can be screwed into the male screw portion 21a of the screw rod 21 is provided on the inner surface of the through hole 68c. A knurled line for preventing slippage is provided on the outer periphery of the circular portion 68 b, and a fixing hole 68 e for fixing the nut cover 68 to the nut 66 via the pin 70 is provided. When the nut cover 68 is screwed into the screw rod 21, the tip end portion of the nut 66 is fitted into the through hole 68c on the circular portion side, and the connection hole 66c and the fixing hole 68e communicate with each other. By inserting the pin 70 through the hole, the nut cover 68 is integrally connected to the nut 66.

  When the nut cover 68 of the feeding mechanism section 60 configured in this way is rotated to one side or the other side, the relative position of the nut cover 68 with respect to the gantry 10 does not change, and the screw rod 21 is relative to the gantry 10 Move in the forward or backward direction. That is, when the nut cover 68 is rotated to one side, the screw rod 21 is moved in a contracting direction, and when the nut cover 68 is rotated to the other side, the screw rod 21 is moved in an extending direction.

  The hydraulic cylinder 30 is a single-acting cylinder, and includes a cylinder tube 31 and a cylinder rod 33 that is slidably inserted into the cylinder tube 31. A supply port 35 for supplying hydraulic oil to the bottom side oil chamber 34 is provided at the bottom side end of the cylinder tube 31. A hydraulic hose for flowing hydraulic oil supplied from a hydraulic pump (not shown) is detachably attached to the supply port 35. This hydraulic hose is provided with a hydraulic gauge (not shown) capable of detecting the hydraulic pressure in the bottom side oil chamber 34, and the tensile load acting on the foot bracket is converted from the pressure value displayed by this hydraulic gauge. Can do.

  The cylinder tube 31 of the hydraulic cylinder 30 is disposed on the opposite side of the pair of leg portions 20 and 20 with the gantry 10 at the center, and is attached to a hooking portion 45 that can be hooked on a foot bracket via a connecting shaft 42. In addition to being connected, the base 10 is supported so as to be movable in the same direction as the extending direction of the leg 20. The hydraulic cylinder 30 is disposed in a state where the rod side end portion extends in the front-rear direction toward the frame portion side, and a cylinder frame 41 is screwed to the rod side end portion of the cylinder tube 31. One end of the connecting shaft 42 that extends in the front-rear direction is fixed to the left and right ends of the cylinder frame 41, and the other end of the connecting shaft 42 is a bush that is inserted into the sliding hole 11 b of the gantry 10. 15 is slidably inserted into the base 15 and extends to the leg 20 side of the gantry 10, and a hook 45 is fixed to the other end of the connecting shaft 42. That is, the connecting member 40 includes a cylinder frame 41 and a connecting shaft 42. In other words, the hydraulic cylinder 30 is supported by the gantry 10 via the connecting member 40 so as to be movable in substantially the same direction as the extending direction of the legs 20. The distal end portion of the cylinder rod 33 is fixed via a locking portion 16 fixed to the center portion of the gantry body portion 11.

  When the hydraulic cylinder 30 attached in this way expands and contracts, the cylinder tube 31 moves in the front-rear direction with respect to the cylinder rod 33, and accordingly, the latching portion 45 moves in the front-rear direction via the connecting member 40.

  The latching portion 45 is formed in an inverted U shape in a side view and extends in the left-right direction, and a space portion 45a into which the footrest portion 73a of the footrest 73 can be inserted is formed inside. The other end portion of the connecting shaft 42 corresponding to the left and right sides of the side surface portion of the hook portion 45 on the frame portion side is fixed.

  The contact plate 50 attached to the distal end portion of the leg portion 20 includes a main body portion 52 formed in a box shape with one end side opened. A contact surface 53 that contacts the peripheral wall 77 of the manhole 76 is provided on the distal end side of the main body 52. The contact surface 53 is curved (for example, R450 mm) so as to be able to contact along the peripheral wall 77 of the manhole 76, and as shown in FIG. 5 (perspective view), knurled eyes are provided on the entire surface.

  Next, a fixing strength inspection method in the case of inspecting the tensile fixing strength with respect to the peripheral wall 77 of the leg metal fitting 73 fixed to the peripheral wall 77 of the manhole using the foot metal fixture fixing strength inspection jig 1 configured as described above. explain.

  First, as shown in FIG. 6A (perspective view), FIG. 6B (plan view), and FIG. 6C (side view), the orientation of the latching portion 45 is adjusted. The orientation of the hooking portion 45 is adjusted by loosening the angle positioning bolt 63 screwed to the gantry 10 and allowing the screw block 61 to turn freely, so that the contact plate 50 moves in the horizontal direction with respect to the gantry 10 (drawing). Then, the screw block 61 is rotated so as to face in the horizontal direction. Then, the loosened bolt 63 is fastened to fix the screw block 61 to the gantry 10.

  And the length adjustment of the leg part 20 with respect to the mount part 10 is performed. 6A to 6C show a case where the fixed strength inspection is performed by shortening the length of the leg 20. The length of the leg 20 is adjusted by rotating the nut cover 68. When the nut cover 68 is rotated to one side, the screw rod 21 moves to the front side with respect to the gantry 10 and contracts. Then, the nut cover 68 is rotated until the length of the screw rod 21 reaches a desired length. The nut cover 68 may be rotated manually, or a tool such as a spanner may be used. When the length of the screw rod 21 reaches a desired length, the rotation of the nut cover 68 is stopped. And the direction and length adjustment of the other leg part 20 are performed similarly.

  In addition, the cylinder tube 31 of the hydraulic cylinder 30 is pulled away from the gantry 10 to move the cylinder tube 31 to the front side, and the latching portion 45 is moved to a position approaching the gantry 10. Then, the orientation of the foot bracket fixing strength inspection jig 1 is adjusted so that the pair of leg portions 20, 20 are arranged in the vertical direction, and the pair of leg portions 20, 20 straddles the foot bracket 73. A latch fixing strength inspection jig 1 is arranged. Then, the contact plate 50 is brought into contact with the peripheral wall 77 of the manhole and rotated so as to contact along the circumferential direction of the peripheral wall 77, so that the footrest portion 73 a of the footrest 73 is hooked on the hooking portion 45. Then, hydraulic oil is supplied to the hydraulic cylinder 30 via the hydraulic hose 37.

  When hydraulic oil is supplied to the hydraulic cylinder 30, the cylinder tube 31 moves to the front side, the latching part 45 moves to the gantry part side, and the leg metal object 73 is pulled through the latching part 45. When the footrest 73 is pulled, the oil pressure in the bottom oil chamber of the hydraulic cylinder 30 is transmitted to the hydraulic gauge via the hydraulic hose 37 and measured by the hydraulic gauge. Then, when a predetermined hydraulic pressure is applied to the hydraulic cylinder 30, if there is almost no amount of displacement by which the foot metal object 73 is pulled out from the peripheral wall 77, it is determined that the tension fixing strength of the foot metal object 73 is strong, and the foot metal object 73. If the displacement amount pulled out from the peripheral wall 77 is large, it is determined that the tensile fixing strength is weak. The hydraulic oil is supplied to the hydraulic cylinder 30 so that the hydraulic pressure gradually increases, and the tensile strength is increased when the displacement amount by which the footrest 73 is pulled out from the peripheral wall 77 before the hydraulic pressure becomes a predetermined hydraulic pressure is increased. May be judged to be weak.

  Here, when a tensile load by the hydraulic cylinder 30 acts on the footrest 73, the tensile load acts in a direction to separate the pair of legs 20 and 20 from the peripheral wall 77 via the cylinder rod 33, the gantry 10 and the like. However, when the tension metal 73 has a high tensile fixing strength, the displacement of the leg metal 73 being pulled out from the peripheral wall 77 is small, so that the contact plate 50 does not leave the peripheral wall 77. For this reason, the posture of the hydraulic cylinder 30 can be maintained in a posture that is substantially in the same direction as the leg portion 73b of the footrest 73, and the tensile fixing strength of the footrest 73 can be accurately inspected.

  Further, since the contact plate 50 is disposed in a grounded manner along the circumferential direction of the peripheral wall 77, the contact area is relatively large. For this reason, when the displacement of the leg metal fitting 73 with respect to the peripheral wall 77 is relatively small, the contact area of the contact plate 50 with the peripheral wall 77 is not reduced, and the posture of the hydraulic cylinder 30 with respect to the leg metal fitting 73 is also legged. It is possible to maintain the posture facing substantially the same direction as the leg portion 73b of the latch 73. The reliability of the inspection result of the tensile fixing strength of the footrest 73 can be improved.

  Since the hydraulic cylinder 30 is attached to the gantry 10 so as to be movable in the front-rear direction, when the leg 20 has been reduced in advance and the orientation of the leg 20 has already been adjusted, the cylinder tube The preparatory work for the footrest fixing strength inspection jig 1 can be completed only by performing the work of moving 31 to a position for separating the base 31 from the gantry 10. Moreover, when the leg part 20 is made into the expansion | extension state previously with respect to the mount part 10, and the direction of the leg part 20 has also been adjusted, Fig.7 (a) (plan view) and FIG.7 (b) (side view) As shown in FIG. 5, the preparation work for the footrest fixing strength inspection jig 1 can be completed only by performing the work of bringing the cylinder tube 31 closer to the gantry 10 side. As described above, the foot bracket fixing strength inspection jig 1 is prepared only by adjusting the position of the hook 45 according to the stretched state of the pair of legs 20 and 20. Therefore, the workability of the work of hooking the hook portion 45 on the leg metal fitting 73 can be improved, and the usability is good.

  Furthermore, since the contact plate 50 of the footrest fixing strength inspection jig 1 is curved (for example, R450 mm), its radius of curvature is relatively large. For this reason, as shown in FIG. 8A (perspective view), FIG. 8B (plan view), and FIG. 8C (side view), the latch is fixed to the peripheral wall 77 ′ having a flat surface. Even when the tensile fixing strength of the object 73 with respect to the peripheral wall 77 ′ is inspected, the contact plate 50 can be grounded with a relatively large area on the surface of the flat peripheral wall 77 ′. For this reason, the posture of the hydraulic cylinder 30 can be maintained in a posture facing substantially the same direction as the leg portions 73b provided at both ends of the footrest 73, and the tensile fixing strength of the footrest 73 is accurately inspected. Can be done.

  Further, in the above-described embodiment, the case where the tensile fixing strength is inspected with respect to the peripheral wall of the footrest 73 fixed to the peripheral wall 77 extending in the vertical direction is shown as an example, but the peripheral wall inclined obliquely in the vertical direction is shown. Even when inspecting the tensile fixing strength of the provided foot bracket 73, the foot bracket fixing strength inspection jig 1 of the present application can be used.

  In this case, the length of the upper leg portion 20 is adjusted to be short so that the posture of the hydraulic cylinder 30 is maintained in a posture facing substantially the same direction as the leg portions 73 b provided at both ends of the footrest 73. Then, the length of the lower leg 20 is adjusted to be longer than that of the upper leg 20. When the peripheral wall provided with the foot metal object 73 is near the peripheral wall extending in the vertical direction, the contact plate 50 provided at the tip of the lower leg 20 is abutted against the peripheral wall extending in the vertical direction. The contact plate 50 provided at the tip of the upper leg 20 is abutted against the obliquely inclined peripheral wall, and the contact plates 50 and 50 are rotated in the circumferential direction of the corresponding peripheral wall to contact along the peripheral wall. Let

  When the peripheral wall provided with the foot metal fitting 73 is separated from the peripheral wall extending in the vertical direction, the length of the upper leg 20 is adjusted to be shorter than that of the lower leg 20 and then the pair of leg 20 , 20 are rotated in the circumferential direction of the obliquely inclined peripheral wall and brought into contact with the peripheral wall. In this way, the foot bracket fixing strength inspection jig 1 of the present application can bring the contact plate 50 into contact with the peripheral wall with a large area without regard to the inclined state of the peripheral wall to which the foot bracket 73 is fixed. The gantry 10 is stably supported by the pair of legs 20, 20, and the hydraulic cylinder 30 can be disposed in substantially the same direction as the extending direction of the legs 73b provided at both ends of the foot metal 73. As a result, the tensile fixing strength of the footrest 73 can be accurately inspected.

  In addition, although embodiment mentioned above showed the case where the tension | pulling fixed strength test | inspection of the leg metal fitting 73 fixed to the surrounding wall 77 of the manhole connected to a sewer pipe was performed, the manhole connected to a gas pipe or a common groove | channel is shown. The foot bracket fixing strength inspection jig and the fixing strength inspection method of the present application can also be applied to the foot bracket fixed to the peripheral wall.

The perspective view of the footrest fixed strength inspection jig concerning one embodiment of the present invention is shown. 1 shows a foot metal fixture fixing strength inspection jig according to an embodiment of the present invention, wherein FIG. 1A is a plan view of the foot metal fixture fixing strength inspection jig, and FIG. It is a side view of a strength inspection jig, and the figure (c) is a front view of a footrest fixed strength inspection jig. 1 is a cross-sectional view of a foot bracket fixing strength inspection jig according to an embodiment of the present invention, in which FIG. 2 (a) is a foot bracket fixing strength inspection treatment corresponding to IIa-IIa in FIG. 2 (c). It is sectional drawing of a tool, The figure (b) is sectional drawing of the footrest fixing strength inspection jig equivalent to the IIb-IIb arrow view of FIG.2 (c). The disassembled perspective view of the footrest fixing strength inspection jig concerning one embodiment of the present invention is shown. The perspective view of the contact plate provided in the footrest fixing strength inspection jig is shown. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating the operation | movement of the foot metal fixing strength inspection jig concerning one embodiment of the present invention, and the figure (a) is a perspective view of the foot metal fixing strength inspection jig, (B) is a top view of a foot metal fixing strength inspection jig, and (c) is a side view of the foot metal fixing strength inspection jig. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating operation | movement of the footrest fixing strength inspection jig concerning one embodiment of this invention, The figure (a) is a top view of a footrest fixing strength inspection jig, (B) is a side view of a footrest fixing strength inspection jig. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating the operation | movement of the foot metal fixing strength inspection jig concerning one embodiment of the present invention, and the figure (a) is a perspective view of the foot metal fixing strength inspection jig, (B) is a top view of a foot metal fixing strength inspection jig, and (c) is a side view of the foot metal fixing strength inspection jig. A conventional manhole diagnostic apparatus is shown, in which (a) is a perspective view of the conventional manhole diagnostic apparatus, and (b) is a drawing showing a pull-out fixing strength test for a peripheral wall of a footrest using the manhole diagnostic apparatus. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foot metal fixture fixed strength inspection jig 10 Base part 20 Leg part 30 Hydraulic cylinder 31 Cylinder tube 33 Cylinder rod 40 Connecting member 45 Hanging part 50 Contact plate 73 Foot metal part 76 Manhole 77 Peripheral wall

Claims (5)

A foot bracket fixing strength inspection jig used when inspecting the tensile fixing strength of the foot bracket fixed to the peripheral wall of the manhole,
A pedestal that can be inserted into the manhole from the upper opening of the manhole;
A pair of legs provided at a predetermined interval on the pedestal portion, extending substantially parallel to each other on one side of the pedestal portion, and being extendable and disposed so as to straddle the footrest;
A hydraulic cylinder that is provided on the gantry between the pair of legs and connects a hooking portion that can be hooked to the tip portion to pull the legging;
A foot bracket fixing strength inspection jig, comprising: a contact plate which is rotatably provided at a distal end portion of the leg portion and can be contacted along a circumferential direction of the peripheral wall of the manhole. The hydraulic cylinder, the cylinder tube is disposed on the opposite side of the leg portion with the pedestal portion at the center, and is supported to be movable in the same direction as the extending direction of the leg portion with respect to the pedestal portion,
A cylinder rod extending from the cylinder tube is fixed to the gantry,
2. The footrest fixing strength inspection jig according to claim 1, wherein the hooking portion is connected to the cylinder tube via a connecting member and is disposed on the leg side with respect to the gantry portion. .   3. The footrest fixing strength inspection jig according to claim 1, wherein unevenness for increasing frictional resistance with the peripheral wall of the manhole is provided on a surface of the contact plate. A pedestal portion that can be inserted into a manhole, and a foothold provided at a predetermined interval in the pedestal portion, extending substantially parallel to each other on one side of the pedestal portion, and being stretchable and fixed to the peripheral wall of the manhole A cylinder tube is supported by a pair of leg portions arranged so as to straddle an object, and a pedestal portion between the pair of leg portions so as to be movable in substantially the same direction as the extending direction of the leg portions. A hydraulic cylinder that is fixed to a pedestal and can be hooked to the foot bracket movably in conjunction with the cylinder tube and pulls the foot bracket, and is rotatable to the tip of the leg. A contact plate provided on the manhole and capable of contacting along a circumferential direction of the peripheral wall of the manhole, and a leg for inspecting a tensile fixing strength of the footrest with respect to the peripheral wall by pulling the footrest with the hydraulic cylinder. Latch A fixing strength testing method using the constant-strength test jig,
In the state where the cylinder tube of the hydraulic cylinder is moved to a position away from the gantry and the latching part is moved to a position close to the gantry, the leg metal is latched on the latching part. The hydraulic oil is supplied to the bottom side oil chamber of the hydraulic cylinder, and the cylinder tube is moved in a direction away from the mount portion with respect to the cylinder rod, so that the foot metal is moved through the hook portion. A fixing strength inspection method using a footrest fixing strength inspection jig characterized by pulling. A pedestal portion that can be inserted into a manhole, and a foothold provided at a predetermined interval in the pedestal portion, extending substantially parallel to each other on one side of the pedestal portion, and being stretchable and fixed to the peripheral wall of the manhole A cylinder tube is supported by a pair of leg portions arranged so as to straddle an object, and a pedestal portion between the pair of leg portions so as to be movable in substantially the same direction as the extending direction of the leg portions. A hydraulic cylinder that is fixed to a pedestal and can be hooked to the foot bracket movably in conjunction with the cylinder tube and pulls the foot bracket, and is rotatable to the tip of the leg. A contact plate provided on the manhole and capable of contacting along a circumferential direction of the peripheral wall of the manhole, and a leg for inspecting a tensile fixing strength of the footrest with respect to the peripheral wall by pulling the footrest with the hydraulic cylinder. Latch A fixing strength testing method using the constant-strength test jig,
In the state where the cylinder tube of the hydraulic cylinder is moved to a position close to the gantry and the latching portion is separated from the gantry, the foot metal is latched on the latching portion, Hydraulic oil is supplied to the bottom oil chamber of the cylinder, the cylinder tube is moved in a direction away from the mount with respect to the cylinder rod, and the foot metal is pulled through the hook. A fixed strength inspection method using a foot bracket fixed strength inspection jig.

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