JP4444768B2 - Locking device for groove lid - Google Patents

Description

  The present invention relates to a locking device for immovably holding a groove lid attached to a drainage groove such as a lateral groove provided on a side portion of a road or a transverse groove provided so as to cross the road.

  In general, a groove lid that shields an upper opening of a drainage channel such as a side groove or a transverse groove is a drainage channel with both side edges supported by lid receiving frames respectively disposed on the upper inner edges of the drainage channel facing each other. Removably attached to. When such a groove lid is formed using a metal material such as iron or stainless steel, there is slight warpage due to an accuracy error at the time of molding, or dust etc. on the contact surface with the lid receiving frame at the time of use. If the foreign object is biting, there is a problem that the groove cover rattles due to the passage of a person or a car and noise is generated, or the groove cover jumps up due to an impact caused by the passage of the car.

Therefore, the applicant of the present application has previously proposed a device for preventing the groove lid from jumping up that can solve such problems (see Patent Document 1). As shown in FIG. 10, the splash prevention device a has a vertical piece e that is fixed to the bottom of the side edge of the groove lid d supported by the lid receiving frame c of the drainage channel b and is suspended downward. And an elastic pressure contact piece portion f folded upward from the lower end of the vertical piece e, and the elastic pressure contact piece portion f is connected to the drainage groove b in a state where the groove lid d is supported by the lid receiving frame c. By being brought into elastic contact with the inner side surface g, a holding action that does not easily jump up even when an impact is applied to the groove lid d is obtained.
JP 2002-364060 A

  By the way, in the above-mentioned prior art, in order to obtain the elastic contact force with respect to the inner surface g of the drainage groove b, the elastic pressure contact piece portion f is connected to the drainage groove b in the non-pressure contact state of the elastic pressure contact piece f. By being provided in a positional relationship that protrudes outward from the inner side surface g, when the groove lid d is attached / detached, the elastic pressure contact piece f is slid in a state where it is always in elastic contact with the inner side surface g of the drainage groove b. Therefore, there is a problem that it is difficult to attach and detach the groove lid d due to the sliding resistance generated at that time. Further, since the groove lid d is held in the drainage groove b only by the elastic contact force of the elastic pressure contact piece f with respect to the inner surface g of the drainage groove b, it is possible to obtain a complete fixing action of the groove lid d. could not.

  The present invention provides a groove lid locking device that eliminates the difficulty of attaching and detaching the groove lid due to the sliding resistance described above, and that can completely fix the groove lid to the drainage groove. It is intended.

  The present invention relates to a locking device for holding a groove lid whose side edges are supported by a lid receiving frame disposed at an upper inner edge of a drainage channel so as to be immovable on the lid receiving frame, and is inserted into the top plate portion. A hole is formed, and the top of the groove lid is fixed to a position in the vicinity of the side edge of the bottom surface of the groove lid. The holder is inserted into the insertion hole of the holder from above and is rotatably held. A lock bolt that is rotationally operated from above, a screw base that is screwed with the lock bolt, and a lock collar that protrudes from the screw base and can be engaged with the lower surface of the lid receiving frame. The lock flange is rotated by the range restricting means so as to rotate between an advancing position facing the lower surface of the lid receiving frame and a retreating position retracted from the fitting insertion gap in the insertion gap formed in the lower part of the lid receiving frame. The range of the bolt is restricted, and the lock bolt And a lock piece provided so as to be moved up and down through a screwing action, and the lock hook part rotates from the retracted position to the advanced position by rotating the lock bolt in the tightening direction. At the same time, the locking piece is lifted through the screwing action and the lock collar is pressed against the lower surface of the lid receiving frame, and the lock bolt is rotated in the locking direction to rotate the lock bolt in the locking direction. The groove of the groove lid is characterized in that the lock piece is lowered to release the pressure contact with the lid receiving frame of the lock collar and the lock collar is rotated to the retracted position. It is a locking device.

Here, the rotation range restricting means is a pair of stopper edges provided at a predetermined position of the holder or the lid receiving frame and abutting against the side of the lock piece or the lock collar part, and one of the stopper edges is A configuration is proposed in which the holder or lid receiving frame is provided at a predetermined position and the other is provided at a predetermined position of the holder .

  Further, when the lock bolt is rotated in the loosening direction in the locked state at the advancement position of the lock collar on the holder or the lid receiving frame, the rotation of the lock collar is restricted by contacting the side of the lock collar. A configuration is proposed in which a rotation regulating piece having a predetermined length is suspended.

  In addition, a configuration is proposed in which the upper surface of the lock collar is formed in a chevron shape that makes line contact with the lower surface of the lid receiving frame.

  Further, a configuration is proposed in which a compression spring is provided between the top plate portion of the holder and the lock piece so as to be loosely fitted to a lock bolt and urge the lock piece downward.

  Furthermore, a configuration is proposed in which the compression spring is accommodated in an accommodation groove formed in the lock piece, and an annular packing is provided on the upper portion of the compression spring so as to cover the accommodation groove in a state of being externally fitted to a lock bolt.

  Moreover, what comprised the insertion space | gap of the lower part of a cover receiving frame by the surrounding frame body of the predetermined shape provided in this cover receiving frame is proposed.

  As described above, the present invention is a lock device for holding a groove lid, whose side edges are supported by a lid receiving frame disposed on an upper inner edge of a drainage channel, in an immovable manner on the lid receiving frame, An insertion hole is formed in the top plate portion, a holder to which the top plate portion is fixed in the vicinity of the side edge of the bottom surface of the groove lid, and a holder hole inserted through the insertion hole of the holder from above. And a lock bolt that is rotated from above the groove lid, a screw base that is screwed with the lock bolt, and a lock collar that protrudes from the screw base and can be engaged with the lower surface of the lid receiving frame. And a rotation range restricting means is used to rotate between an advancing position facing the lower surface of the lid receiving frame and a retreating position retracting from the inserting gap in the insertion gap formed in the lower part of the lid receiving frame. The rotation range is regulated so that the rotation is restricted at the advanced position and the retracted position. And a lock piece provided so as to be moved up and down through a screwing action by rotating the lock bolt, and the lock collar moves from the retracted position to the advanced position by rotating the lock bolt in the tightening direction. The lock piece is raised through the screwing action and the lock collar is pressed against the lower surface of the lid receiving frame, and the lock bolt is rotated in the loosening direction in the locked state to rotate the lock bolt. The lock piece is lowered through the advancing action so that the press contact with the lid receiving frame of the lock hook portion is released, and the unlocking state in which the lock hook portion rotates to the retracted position is generated. Since this is a locking device for the groove lid, when the lock bolt is rotated in the tightening direction, the lock collar portion first rotates from the retracted position to the advanced position through the action of the rotation range restricting means, and then the advanced position. Screwing action Via locking lock piece is raised by rod portion is locked state pressed against the bottom surface of the cover receiving frame. In this locked state, the lock lid is pressed against the lower surface of the lid receiving frame, so that the groove lid is held immovably with respect to the lid receiving frame, thereby preventing the groove lid from rattling or jumping up. It can be surely prevented. In the locked state, when the lock bolt is rotated in the loosening direction, the lock piece is first lowered through the screwing action to release the pressure contact with the lid receiving frame of the lock collar, and then the lock collar is It turns to the retracted position and enters the unlocked state. Since the groove lid can be attached / detached in this unlocked state, as in the past, when the groove lid is attached / detached, the elastic pressure contact piece is always in sliding contact with the inner surface of the drainage groove. There is no dynamic resistance, and the attaching / detaching work can be performed easily. Furthermore, in the present invention, since the lock collar portion is brought into pressure contact with the lower surface of the lid receiving frame to be in the locked state, a complete fixing action of the groove lid can be obtained.

  In the configuration in which the rotation range restricting means is a pair of stopper edges that are provided at predetermined positions of the holder or the lid receiving frame and abut against the side portions of the lock pieces or the lock collars, By selectively abutting the side portions of the lock portion, the rotation range of the lock hook portion can be easily restricted, and in the rotation restricting state in which the side portion of the lock hook portion is in contact with each stopper edge. By rotating the lock bolt, the lock collar can be raised and lowered via a screwing action at the advance position and the retracted position of the lock collar.

  Further, when the lock bolt is rotated in the loosening direction in the locked state at the advancement position of the lock collar on the holder or the lid receiving frame, the rotation of the lock collar is restricted by contacting the side of the lock collar. In the configuration in which the rotation restricting piece of a predetermined length is suspended, when the lock bolt is somewhat loosened due to vibration or shock caused by the passage of a person or a car during use, it contacts the side of the lock collar The lock restricting piece is held at the advanced position by the rotation restricting piece and does not immediately rotate to the retracted position. Therefore, even if the play is loose, the groove cover can be prevented from jumping up at the minimum.

  Further, in the configuration in which the upper surface of the lock hook part is formed in an angled sharp shape that comes into line contact with the lower surface of the lid receiving frame, the lock shape of the angled sharp lock in the locked state where the lock hook part is pressed against the lower surface of the cover receiving frame When the upper surface of the collar portion is in pressure contact with the lower surface of the lid receiving frame, the pressure contact force is increased, and the groove lid can be firmly held against the lid receiving frame. Furthermore, the effect that it becomes difficult for sand to accumulate on the upper surface of a lock hook part is also acquired.

  Further, in a configuration in which a compression spring that is loosely fitted to a lock bolt and biases the lock piece downward is interposed between the top plate portion of the holder and the lock piece, The free rotation of the part is prevented, and the lock hook part can be held in the retracted position. Here, when the lock hook part can be freely rotated, when the groove cover is inclined during the attaching / detaching operation of the groove cover, the lock hook part rotates to the advanced position by its own weight, and the lock cover part is rotated. In some cases, it may be difficult to attach or detach the cover by the cover receiving frame. As described above, the lock cover is urged downward by the compression spring to hold the lock collar in the retracted position. Even if the groove lid is tilted during the attachment / detachment operation, the lock collar does not rotate to the advanced position, so that the attachment / detachment operation of the groove cover can be easily performed.

  Further, in the configuration in which the compression spring is housed in the housing groove formed in the lock piece, and an annular packing is provided on the upper portion of the compression spring so as to cover the housing groove while being externally fitted to the lock bolt. When the bolt is tightened, the storage groove is shielded by the annular packing that is crushed by the top plate portion of the holder and the lock piece, thereby preventing sand and mud from entering the storage groove.

  In addition, in the case where the insertion gap at the lower part of the lid receiving frame is constituted by a surrounding frame body of a predetermined shape provided in the lid receiving frame, the drainage groove path at the time of placing concrete for forming the drainage groove path The required insertion gap can be easily formed in the lower part of the lid receiving frame disposed on the upper inner edge of the upper part, and the work efficiency is improved.

Below, the 1st Example of the locking device of the groove cover concerning this invention is described based on FIGS.
The drainage channel 1 is formed in a substantially U-shaped cross section by placing concrete p, and the upper inner edge facing the drainage channel 1 is made of a metal angle material as shown in FIGS. A substantially L-shaped lid receiving frame 2 is provided. On the lower surface of the horizontal lid receiving edge 2a of the lid receiving frame 2, an enclosure frame 3 that opens toward the inner side of the drainage channel 1 is welded or the like at positions corresponding to at least four corners of the groove lid 6 described later. Each is fixed through a joining means. As shown in FIGS. 1 to 3, the surrounding frame 3 is formed in a substantially box shape by left and right side walls 4a, 4a, a bottom wall 4b, and a rear wall 4c. By placing concrete p around the outer periphery of the lid receiving frame 2 held at a predetermined position by an anchor (not shown) while being fixed to the lower surface of the lid receiving edge 2a, the surrounding frame 3 lowers the lower portion of the lid receiving frame 2. The insertion gap 5 into which a lock collar 20 (to be described later) is inserted is formed. The insertion gap 5 can be formed directly in the concrete p below the lid receiving frame 2 by using a punching die. However, the surrounding frame 3 is previously formed on the lower surface of the horizontal lid receiving edge 2a. If the concrete p is placed in a state where it is fixed to the wall, the insertion gap 5 can be easily formed, and the work efficiency is improved. Further, the drainage channel 1 can also be configured by using a concrete groove material having a substantially U-shaped cross section. In this case, a lid receiving frame 2 and an insertion gap 5 are previously provided in the concrete groove material. Provided.

  A rectangular groove lid 6 that covers the upper opening of the drainage channel 1 is detachably attached to the drainage channel 1 with the side edges supported by the lid receiving frames 2 on both sides. The groove cover 6 is made of metal grating, and includes a plurality of main bars 7 arranged in parallel at a predetermined interval, side bars 8 respectively passed along both side ends of the main bars 7, and both sides of the main bars 7. It is constituted by an appropriate number of cross bars 9 which are passed between the end portions at a predetermined interval and orthogonally. In the present invention, the groove lid 6 does not necessarily have to be grating, but has a predetermined strength capable of shielding the upper opening of the drainage channel 1, for example, a steel plate and a reinforcing bar are assembled. It may be a metallic groove lid (not shown). In this case, a through hole for rotational operation is formed above the lock bolt 14 described later.

  On the other hand, lock devices 10 according to the main part of the present invention are disposed at positions corresponding to the respective insertion gaps 5 at least at the four corners of the groove lid 6. As shown in FIGS. 1 and 2, the locking device 10 includes a holder 13 having an insertion hole 12 formed in the top plate portion 11, and the top plate portion 11 is near the side edge of the bottom surface of the groove lid 6. It is fixed to the position via a joining means such as welding. A lock bolt 14 inserted from above into the insertion hole 12 of the top plate 11 is rotatably held by the holder 13. The lock bolt 14 is located in a gap formed between the adjacent main bars 7 and 7 of the metal grating constituting the groove lid 6 so that the lock bolt 14 can be rotated from above the groove lid 6. It has become.

  The male screw collar portion 15 of the lock bolt 14 is screwed into a vertical female screw hole 18 formed in a screw base 17 constituting the lock piece 16. Further, a retaining pin 19 is fitted from the side to a lower end portion of the male screw collar 15 projecting downward from the screw base 17, and the male screw collar 15 of the lock bolt 14 is secured by the retaining pin 19. Therefore, the lock piece 16 does not fall off. The lock piece 16 includes the screw base 17 that is screwed with the lock bolt 14, and a lock flange 20 that is projected from the screw base 17 and can be engaged with the lower surface of the lid receiving frame 2. . As shown in FIG. 2, the upper surface of the lock hook portion 20 is formed in a chevron shape so that the upper surface of the lock hook portion 20 can come into line contact with the lower surface of the lid receiving frame 2. ing.

  The lock piece 16 is rotated through the rotation operation of the lock bolt 14, and is relative to the male screw collar 15 by the screwing action of the male screw collar 15 screwed into the female screw hole 18. It is supposed to go up and down. Here, as shown in FIG. 3, the holder 13 includes a substantially L-shaped side plate portion 21 that extends downward from the top plate portion 11, and both side edges of the side plate portion 21 have a rotation range restriction. A pair of stopper edges 22a and 22b as means are provided. Then, the rotation range of the lock piece 16 is regulated by selectively abutting the side portions of the lock flange portion 20 on the stopper edges 22a and 22b. It rotates so as to rotate between approximately 90 ° between the advance position facing the lower surface of the lid receiving frame 2 and the retracted position retracted from the fitting insertion gap 5 in the fitting gap 5 formed in the lower part of the lid receiving frame 2. It has become. Further, at the advancing position where the side portion of the lock flange portion 20 abuts against the stopper edge 22a, the lock piece 16 whose rotation is restricted by the stopper edge 22a by the rotation operation of the lock bolt 14 in the tightening direction is the male screw flange portion. As shown in FIG. 4, the lock flange 20 is brought into a locked state in which it is pressed against the lower surface of the lid receiving frame 2, and the lock bolt 14 in the locked state is brought about. , The locking piece 16 is lowered through the screwing action caused by the rotation of the male screw collar 15 in the loosening direction, and the pressure contact with the lid receiving frame 2 of the lock collar 20 is released. As shown in FIG. 3, the lock collar 20 is rotated to the retracted position where it comes into contact with the stopper edge 22b, and the unlocked state is generated. Further, at the retracted position where the side of the lock flange 20 abuts against the stopper edge 22b, the lock piece 16 whose rotation is restricted by the stopper edge 22b is controlled by the rotation operation of the lock bolt 14 in the loosening direction. The part 15 descends through a screwing action caused by rotation in the relaxation direction.

  Further, as shown in FIG. 5, the top plate portion 11 of the holder 13 has a side portion of the lock flange portion 20 when the lock bolt 14 is rotated in the loosening direction at the advanced position of the lock flange portion 20. A rotation restricting piece 23 having a predetermined length is provided so as to be in contact with the lock flange 20 and restrict the rotation of the lock flange 20 in the retracted position direction.

  In this configuration, each lock device 10 is in the unlocked state in which the lock collars 20 of the lock devices 10 respectively disposed at at least four corners of the groove lid 6 are in the retracted position as shown in FIG. When the lock bolt 14 is rotated in the tightening direction, as shown in FIGS. 1 and 3, first, the lock collar 20 is rotated from the retracted position to the advanced position, and then at the advanced position via a screwing action. As shown in FIG. 4, the lock piece 16 is lifted, and the lock collar portion 20 is brought into a locked state in which it is pressed against the lower surface of the lid receiving frame 2. In this locked state, the lock cover 20 is pressed against the lower surface of the cover receiving frame 2 so that the groove cover 6 is held immovably with respect to the cover receiving frame 2. It is possible to reliably prevent rattling and jumping. Further, since the upper surface of the lock hook portion 20 is formed in the shape of a chevron, in this locked state, the upper surface of the lock hook portion 20 having the chevron shape is in pressure contact with the lower surface of the lid receiving frame 2 in line contact. As a result, the pressure contact force is increased, and the groove lid 6 can be firmly held against the lid receiving frame 2. Further, the holder 13 is brought into contact with the side of the lock collar 20 when the lock bolt 14 is rotated in the loosening direction at the advanced position of the lock collar 20, and the lock collar 20 is rotated. Since the rotation restricting piece 23 of a predetermined length that restricts the movement is suspended, even if the lock bolt 14 is loosened slightly due to vibration or impact caused by the passage of a person or a car during use, The lock restricting portion 23 that is in contact holds the lock collar 20 at the advanced position and does not immediately rotate to the retracted position. Thereby, even if a backlash occurs, the function of preventing the groove lid 6 from jumping up can be secured at a minimum.

  In the locked state, when the lock bolt 14 is rotated in the loosening direction, first, the lock piece 16 is lowered through the screwing action to release the pressure contact with the lid receiving frame 2 of the lock collar 20, and then When the lock hook part 20 is lowered beyond the length of the rotation restricting piece 23, the lock hook part 20 is turned to the retracted position to be unlocked. Since the groove lid 6 can be attached and detached in this unlocked state, the elastic pressure contact piece f (see FIG. 10) is always elastically contacted with the inner surface of the drainage channel 1 when the groove lid 6 is attached / detached. The sliding resistance due to sliding in the above state does not occur, and the attaching / detaching work can be easily performed. Furthermore, in the present invention, since the lock collar 20 is brought into pressure contact with the lower surface of the lid receiving frame 2 to be in a locked state, a complete fixing action of the groove lid 6 can be obtained.

  In the first embodiment described above, the stopper edge 22a that contacts the side portion of the lock collar 20 at the advancement position of the lock piece 16 and restricts the rotation range is provided on one side plate portion 21 formed on the holder 13. Instead of this, instead of this, as shown in FIG. 6 (a), one side wall 4a of the surrounding frame 3 may be a stopper edge 22a. Moreover, when forming the insertion space | gap 5 without using the surrounding frame 3, you may suspend the stopper edge 22a from the lower surface of the lid receiving frame 2, as shown in FIG. Furthermore, in the first embodiment described above, the rotation restricting piece 23 is suspended from the holder 13, but instead of this, as shown in FIG. It may be suspended.

  FIG. 8 shows a second embodiment. This second embodiment is loosely fitted to the lock bolt 14 between the top plate portion 11 and the lock piece 16 of the holder 13 to urge the lock piece 16 downward. A compression spring 24 is interposed. Other configurations are the same as those of the first embodiment, and the same parts are denoted by the same reference numerals and redundant description is omitted.

  In such a configuration, in the unlocked state, the lock spring 16 is urged downward by the compression spring 24 to prevent free rotation of the lock hook 20 and hold the lock hook 20 in the retracted position. be able to. Here, when the lock hook part 20 can be freely rotated, when the groove cover 6 is tilted during the attaching / detaching operation of the groove cover 6, the lock cover part 20 is rotated to the advanced position by its own weight. In some cases, it may be difficult to attach or detach the lock hook portion 20 to the lid receiving frame 2, but as described above, the lock piece 16 is urged downward by the compression spring 24 to retract the lock hook portion 20. By holding in the position, the lock cover 20 does not rotate to the advanced position even when the groove cover 6 is tilted during the attachment / detachment operation of the groove cover 6, so that the attachment / detachment operation of the groove cover 6 can be easily performed.

  FIG. 9 shows a third embodiment. In the third embodiment, a storage groove 25 for storing the compression spring 24 is formed in the upper part of the female screw hole 18 of the lock piece 16. An annular packing 26 that covers the storage groove 25 in a state of being externally fitted to the lock bolt 14 is disposed on an upper portion of the compression spring 24 stored in the storage. Here, the annular packing 26 is formed of a sealing elastic material such as rubber or synthetic resin having appropriate elasticity. The inner diameter is slightly larger than the diameter. As a result, when the annular packing 26 is crushed, the inner peripheral surface of the insertion hole 27 is pressed against the lock bolt 14 so that there is no gap with the lock bolt 14. A flat washer 28 is interposed between the annular packing 26 and the compression spring 24.

  In this configuration, when the annular packing 26 is crushed by the top plate portion 11 and the lock piece 16 of the holder 13 when the lock bolt 14 is tightened, the upper portion of the storage groove 25 is shielded. Sand and mud can be prevented from entering.

It is side sectional drawing which shows the construction state of the groove cover 6 provided with the locking device 10 concerning a 1st Example. It is action explanatory drawing which shows the lock release state of the locking device 10 same as the above. It is a bottom view of the locking device 10 same as the above. It is action explanatory drawing which shows the locked state of the locking device 10 same as the above. It is a sectional side view showing the configuration of the rotation restricting piece 23 provided in the holder 13 and the operation thereof. (A) is a bottom view of the locking device 10 showing a configuration in which one side wall 4a of the surrounding frame body 3 is a stopper edge 22a, and (b) is a configuration in which the stopper edge 22a is suspended from the lower surface of the lid receiving frame 2. 3 is a bottom view of the lock device 10 showing a configuration in which a rotation restricting piece 23 is suspended from the lower surface of the lid receiving frame 2. FIG. It is a sectional side view which shows the construction state of the groove cover 6 provided with the locking device 10 concerning a 2nd Example. It is a sectional side view which shows the construction state of the groove cover 6 provided with the locking device 10 concerning a 3rd Example. It is a sectional side view which shows the construction state of the groove cover d provided with the splash prevention apparatus a of the conventional structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drain channel 2 Lid receiving frame 3 Enclosure frame 5 Fitting insertion space 6 Groove lid 10 Locking device 11 Top plate part 12 Insertion hole 13 Holder 14 Lock bolt 17 Screw base 16 Lock piece 20 Lock collar part 22a, 22b Stopper edge ( (Turning range regulating means)
23 Rotation restricting piece 24 Compression spring 25 Storage groove 26 Annular packing

Claims (7)

A lock device for holding a groove lid, whose side edges are supported by a lid receiving frame disposed at an upper inner edge of the drainage channel, so as to be immovable on the lid receiving frame,
An insertion hole is formed in the top plate portion, and a holder to which the top plate portion is fixed at a position near the side edge of the bottom surface of the groove lid,
A lock bolt that is inserted into the insertion hole of the holder from above and is rotatably held and rotated from above the groove lid;
A screw base that is screwed to the lock bolt; and a lock hook that protrudes from the screw base and can be engaged with the lower surface of the cover receiving frame. The rotation range is regulated so as to rotate between the advance position facing the lower surface of the cover receiving frame in the insertion gap formed in the lower part of the cover and the retreat position retracted from the insertion gap, and the advance position And a lock piece provided so as to be lifted and lowered via a screwing action by a rotation operation of the lock bolt in a rotation restricted state in the retracted position,
When the lock bolt is rotated in the tightening direction, the lock collar is rotated from the retracted position to the advanced position, and the lock piece is lifted through the screwing action so that the lock collar is pressed against the lower surface of the lid receiving frame. And the lock bolt in the locked state is rotated in the loosening direction, the lock piece is lowered through the screwing action, and the pressure contact with the lid receiving frame of the lock collar is released, and the lock collar A lock device for a groove lid, characterized in that an unlocked state in which a portion rotates to a retracted position is generated. The rotation range restricting means is a pair of stopper edges abutting against the side of the lock piece or the lock collar , wherein one of the stopper edges is provided at a predetermined position of the holder or the lid receiving frame, and the other is a predetermined position of the holder The groove lid locking device according to claim 1, wherein the groove lid locking device is provided.   A predetermined length that restricts the rotation of the lock collar by contacting the side of the lock collar when the lock bolt is rotated in the loosening direction when the lock collar is advanced to the holder or lid receiving frame. The groove lid locking device according to claim 1, wherein a rotation restricting piece is vertically provided.   The groove lid locking device according to any one of claims 1 to 3, wherein an upper surface of the lock hook portion is formed in a chevron shape in line contact with the lower surface of the lid receiving frame.   5. A compression spring that is loosely fitted to a lock bolt and biases the lock piece downward is interposed between the top plate portion of the holder and the lock piece. A device for locking the groove lid as described above.   6. A compression spring is accommodated in an accommodation groove formed in the lock piece, and an annular packing is provided above the compression spring to cover the accommodation groove in a state of being externally fitted to a lock bolt. The groove lid locking device described in 1.   The groove cover lock according to any one of claims 1 to 6, wherein the insertion gap at the lower portion of the lid receiving frame is constituted by a surrounding frame body having a predetermined shape provided on the lid receiving frame. apparatus.

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