JP4194049B2 - Intrusion release structure for lids for underground structures - Google Patents

Description

The present invention relates to a biting release structure for a lid for an underground structure.
As used herein, “underground structure lid” refers to a large iron lid, a manhole lid, a sewage culm lid, an electric / Openable and closable joint gutter lids, power transmission iron lids, power distribution iron lids, buried underground pipes in waterworks and gas pipes, and their associated equipment to protect underground facilities equipment and underground cables in communications A fire hydrant lid, a water control valve lid, a gate valve lid, an air valve lid, a gas pipe lid, a water meter lid, etc., that function as an open / close door.

  Various types of underground structure lids are composed of a receiving frame that is installed at the upper end of the underground structure and communicates with the underground structure, and a lid body that fits into the receiving frame and closes. The lid body is supported on the receiving frame by taper fitting or the like in order to suppress rattling noise when the vehicle travels. Because of this structure, the lid body gradually bites into the receiving frame due to the weight of the vehicle passing over the lid body, and when removing the lid body from the receiving frame, it is much stronger than simply lifting the lid body to release the bite Since force is required, a method is adopted in which the tip of the bar is inserted into a bar hole formed on one side of the lid body, and the bite of the lid body is released from the receiving frame using the lever principle (for example, Patent Document 1).

  In the technique described in Patent Document 1, a burl hole is formed on one side of the periphery of the lid body so as to have a shape opened upward and in the outer circumferential direction of the lid body, and opposed to both sides in the burr hole. When the cover body fitted in the receiving frame is released from being bitten, the engaging portion formed in a substantially T shape at the tip of the burl is inserted into the burl hole. The projecting part is brought into contact with both overhangs from below, the contact point is used as an action point, one side of the bar is brought into contact with the periphery of the receiving frame as a fulcrum, and the base end side of the bar is regarded as a force point. In this manner, the lever is swung downward, and by applying the upward force to the protruding portion of the burl hole by the lever principle, the lid body is detached from the receiving frame to release the bite.

  However, in the technique of Patent Document 1, since the bar hole formed in the lid body is opened in the outer circumferential direction in order to use the peripheral edge of the receiving frame as a fulcrum of the bar, the portion is sufficient for the outer circumference of the lid body. If the lid body is supported in a slightly inclined position with respect to the receiving frame without forming a tapered surface, the inside and outside of the underground structure will be between the inner peripheral surface of the receiving frame and the location of the bar hole formed in the lid body. There was a problem in terms of water-stopping because a gap communicating with each other was generated, and rainwater and the like flow into the underground structure from this gap.

Then, the proposal which paid its attention to the problem of such a water stop is also made | formed (for example, refer patent document 2). In the technique of Patent Document 2, the outer peripheral side of the burl hole of the lid main body is closed without opening, thereby forming the outer peripheral surface of the lid main body having the same taper shape as the other portions at the burr hole. The water stoppage is improved. Then, by closing the outer peripheral side of the burr hole, a general burl with only an engaging portion formed at the tip cannot be used as a fulcrum by abutting one side of the burr on the periphery of the receiving frame. The hook end of the bar is formed in a hook shape so as to engage with the overhanging portion of the bar hole, and the vicinity of the bar end is bent in a direction following the hook to project the latching claw portion. With the tip of the hook engaged with the overhanging portion of the burl hole, the bar claw can be used as a fulcrum by abutting on the periphery of the receiving frame while straddling the outer periphery of the lid body and avoiding interference is doing.
Japanese Utility Model Publication No. 58-5712 Japanese Patent No. 2617868

  However, the technique of Patent Document 2 requires a special bar having a special shape at the tip in order to avoid interference with the outer periphery of the lid body. Moreover, in the actual maintenance work of the underground structure lid, since the underground structure lid of the type assumed in Patent Document 1 and Patent Document 2 may be mixed, the maintenance work in such an area is performed. Then, the bar of patent document 2 must be carried with a general bar, and there exists another problem that the burden of a maintenance work increases.

  The present invention was made in order to solve such problems, and the object of the present invention is to achieve good water stopping and reliably prevent the inflow of rainwater and the like into the underground structure, An object of the present invention is to provide a cover release structure for a lid for an underground structure that can release the cover body from biting without requiring a dedicated bar.

  In order to achieve the above object, the invention according to claim 1 is a receiving frame installed at the upper end of the underground structure, and is detachably fitted into the receiving frame to close the receiving frame, and is located at a position spaced from the outer peripheral edge toward the center side. A lid body through which a burl hole is inserted, through which the engaging portion of the burl for opening and closing the lid can be inserted, and the burr hole of the lid body is closed from below by being urged upward by the urging means; A movable fulcrum lid that lowers against the urging force of the urging means to open the burr hole and forms a gap with the lower surface of the lid body when pressed from above by the joint portion; A stopper portion that is formed around the periphery and that abuts against the movable fulcrum lid and restricts the descent when the movable fulcrum lid descends against the urging force of the urging means.

Therefore, the burr hole is formed at a position separated from the outer peripheral edge of the lid body toward the center side, so that the outer circumference side of the burr hole of the lid body is closed and the inner circumference surface of the receiving frame is in the same manner as other parts. Good water-stopping performance.
On the other hand, the movable fulcrum lid is lifted by the urging force of the urging means to close the burl hole of the lid body from below, and when the movable fulcrum lid is pressed from above by the engaging portion at the tip of the bar, the movable fulcrum lid is It descends against the urging force of the urging means and comes into contact with the stopper portion of the receiving frame. In this state, the lowering of the movable fulcrum lid is restricted by the stopper portion, and a gap is formed between the movable fulcrum lid and the lower surface of the lid body. If it is made to abut on the lid and function as a fulcrum, the other side of the engaging portion of the bar abuts on the lower surface of the lid main body to function as an action point, Based on the principle of the lever, an upward force is applied to the lid body, so that the biting of the lid body with respect to the receiving frame can be released.

  That is, the engaging portion of the bar only needs to have a shape capable of abutting one side to the fulcrum and the action point, and a general shape can be used without using a dedicated bar having a special tip. The bar can be used.

  The invention of claim 2 relates to a receiving frame installed at the upper end of the underground structure and a bar for opening and closing the lid at a position spaced from the outer peripheral edge to the center side by being detachably fitted in the receiving frame and closing the receiving frame. A lid main body through which a bar hole into which the joint portion can be inserted is penetrated, and a swinging support is supported below the bar hole in the lid main body, and an engagement claw is engaged with an engagement protrusion provided on the receiving frame. The swinging member that regulates the opening of the lid main body while being swung by the engaging portion of the burl and can release the engagement of the engaging claw with respect to the engaging projection, and the guide member with respect to the swinging member The urging means is supported so that it can be moved up and down, urged upward by the urging means, closes the burl hole of the lid body from below, and pressed from above by the engaging portion of the burl. Lowers against the urging force to open the burr hole and form a gap with the bottom surface of the lid body A movable fulcrum lid and a stopper portion that is formed on the inner periphery of the receiving frame and that contacts the movable fulcrum lid when the movable fulcrum lid descends against the urging force of the urging means and regulates the descent. It is.

Therefore, the burr hole is formed at a position separated from the outer peripheral edge of the lid body toward the center side, so that the outer circumference side of the burr hole of the lid body is closed and the inner circumference surface of the receiving frame is in the same manner as other parts. Good water-stopping performance.
On the other hand, the movable fulcrum lid is supported by the swinging member so as to move up and down, and is lifted by the biasing means to close the bar hole of the lid body from below, and the engaging claw of the swinging member is Engagement with the engagement protrusion of the receiving frame restricts the opening of the lid body.

  When the movable fulcrum lid is pressed from above by the engaging portion at the tip of the bar, the movable fulcrum lid descends against the urging force of the urging means and comes into contact with the stopper portion of the receiving frame. In this state, the lowering of the movable fulcrum lid is restricted by the stopper portion, and a gap is formed between the movable fulcrum lid and the lower surface of the lid body. If it is made to abut on the lid and function as a fulcrum, the other side of the engaging part abuts on the lower surface of the lid body to function as an action point, According to the principle, an upward force is applied to the lid body, so that the biting of the lid body with respect to the receiving frame can be released.

That is, the engaging portion of the bar only needs to have a shape capable of abutting one side to the fulcrum and the action point, and a general shape can be used without using a dedicated bar having a special tip. The bar can be used.
When the rocking member is swung by the engaging portion of the bar inserted into the burl hole after the cover body is released from biting, the engagement claw is disengaged from the engaging protrusion and the cover body is opened. It becomes possible. In this way, the engagement release portion and the unlocking operation of the lid main body can be completed as a series of continuous bar operations by the engaging portion of the bar inserted into the bar hole.

According to a third aspect of the present invention, in the first or second aspect, when the movable fulcrum lid is lowered against the urging force of the urging means on the upper surface of the movable fulcrum lid against the urging force of the urging means. A guide inclined surface is formed which moves the engaging portion to the lower side of the lid main body while sliding.
Therefore, in order for the bar engaging portion to abut the lower surface of the lid body to function as an action point, it is necessary to move the bar engaging portion inserted into the bar hole to the lower side of the lid body. When the movable fulcrum lid is lowered by being pressed by the engaging portion, the engaging portion of the burl is automatically moved to the lower side of the lid main body by the guide inclined surface on the movable fulcrum lid, so that no special operation is performed. It becomes easy to execute.

  As described above, according to the underground structure lid biting release structure according to the first aspect of the present invention, a good waterstop is realized by forming a burl hole at a position spaced from the outer peripheral edge of the lid body toward the center side. As a result, it is possible to reliably prevent the inflow of rainwater and the like into the underground structure, and use the movable fulcrum lid as a fulcrum when the descent is restricted by the stopper part of the receiving frame. Since the bite of the lid main body is released, the bite of the lid main body can be released by a bar having a general shape without requiring a dedicated bar.

  According to the underground structure lid biting release structure according to the second aspect of the present invention, it is possible to realize a good waterstop by forming a burr hole at a position spaced from the outer peripheral edge of the lid body toward the center side. It is possible to reliably prevent the inflow of rainwater, etc. into the interior, and to use the movable fulcrum lid as a fulcrum when the descent is restricted by the stopper portion of the receiving frame, the bar body engaging the lid body by this principle Therefore, it is possible to release the clogging of the lid body with a general-shaped bar without requiring a dedicated bar, and the swinging member swings with the engaging part of the bar inserted into the bar hole. Since the lid body can be unlocked, the bite release operation and the unlocking operation of the lid body can be executed quickly and easily as a series of continuous bar operations.

  According to the underground structure lid biting release structure of the invention of claim 3, in addition to claims 1 and 2, the engaging portion is guided by utilizing the pressing force of the engaging portion of the bar against the movable fulcrum lid. Since the sliding movement is made on the inclined surface and moved to the lower side of the lid main body, the bite release operation of the lid main body can be performed more easily.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying an underground structure lid biting release structure according to the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing an underground structure lid biting release structure according to this embodiment, and the underground structure lid 1 includes a receiving frame 2 and a lid body 3. The receiving frame 2 has an annular shape in plan view, and although not shown, is installed on the road surface with its surroundings paved with asphalt or the like, and the interior communicates with the underground structure. The lid body 3 has a circular shape in plan view so as to correspond to the receiving frame 2 and is fitted into the receiving frame 2 by taper fitting, and one side of the outer periphery thereof is connected to the receiving frame 2 by a hinge structure 4, On the other side facing 180 °, a biting release structure 5 for releasing the bite of the lid body 3 with respect to the receiving frame 2 and a locking structure 6 for preventing the lid body 3 from being accidentally opened are provided.

  The biting release structure 5 and the locking structure 6 are provided with a bar 41 (FIG. 2) that is a tool for releasing bite and opening / closing the lid in a burl hole 7 formed at a position spaced from the outer peripheral edge of the lid body 3 toward the center. Is inserted and the bar 41 is appropriately swung, so that the bite can be released and locked / unlocked arbitrarily. Hereinafter, the biting release structure 5 and the locking structure 6 will be described in detail.

  2 is a partially enlarged sectional view showing the bite release structure 5 and the locking structure 6 when the lid body is closed, FIG. 3 is a sectional view taken along the line III-III in FIG. 2, and FIG. FIG. 3 is an exploded perspective view showing a movable fulcrum lid 21. As shown in FIG. 2, the inner peripheral surface of the receiving frame 2 and the outer peripheral surface of the lid body 3 are both formed in a tapered cross section whose diameter is reduced downward, and the lid body 3 is taper-fitted and fixed in the receiving frame 2. Is done. The burl hole 7 is formed slightly on the center side (right side in FIGS. 2 and 3) from the outer periphery of the lid body 3, and the center side is formed in a substantially rectangular shape having an arc shape and penetrates the lid body 3 vertically. Yes.

That is, in the underground structure lid 1 of the present embodiment, the outer peripheral side (the left side in FIGS. 2 and 3) of the burl hole 7 of the lid body 3 is closed without being opened, as in the technique of Patent Document 2 described above. Therefore, the portion of the burr hole 7 on the outer periphery of the lid main body 3 also forms a tapered outer peripheral surface similar to the other portions, and exhibits sufficient water stoppage due to close contact with the inner peripheral surface of the receiving frame 2. .
A pair of bearing portions 10 project from the lower surface of the lid body 3 so as to be located on the left and right sides of the burl hole 7 (upper and lower sides in FIG. 3), and the bearing portions 10 are respectively formed with bearing holes 10a. A swinging housing 11 (swinging member) is disposed below the burl hole 7 of the lid main body 3, and a pair of support arms are directed upward on the left and right sides of the swinging housing 11 as shown in FIG. 12 is extended. Oscillating shafts 13 project from the upper right side surface of the right support arm 12 and the upper left side surface of the left support arm 12, respectively, and these oscillating shafts 13 rotate within the bearing hole 10a of the lid body 3. By being supported so as to be able to swing, the swinging casing 11 is suspended so as to be swingable in the center and outer peripheral directions of the lid body 3.

  An engaging claw 14 is integrally formed at the lower part of the swinging casing 11 toward the outer peripheral side, and an engaging projection 15 is integrally formed on the inner peripheral surface of the receiving frame 2 so as to be positioned above the engaging claw 14. In the substantially upright posture (hereinafter referred to as a locking position) suspended from the lid body 3 as shown by a solid line in FIG. 2, the swinging housing 11 positions the engaging claw 14 below the engaging projection 15 of the receiving frame 2. Thus, while the lid of the lid body 3 is restricted from being opened, the engaging claw 14 is moved from below the engaging projection 15 in a posture (hereinafter referred to as an unlocking position) in which the lower portion is swung in the center direction as indicated by a virtual line. The lid body 3 is retracted to allow the lid body 3 to be opened.

In the oscillating housing 11, a guide hole 16 having a square cross section is vertically provided between the support arms 12, and a spring seat 18 is formed concentrically at an upper opening portion of the guide hole 16. The lower opening is formed in a cylindrical shape from below to form a washer contact surface 19.
A movable fulcrum lid 21 is disposed between the support arms 12 of the swinging casing 11, and a guide rod 22 extends downward from the movable fulcrum lid 21. The guide rod 22 has a square cross section and is inserted from above into the guide hole 16 of the swinging housing 11, and a washer 23 is caulked and fixed to the lower end of the guide rod 22 protruding into the lower opening of the guide hole 16. ing. As a result, the movable fulcrum lid 21 is supported so as to be movable up and down with respect to the swinging housing 11 in a state in which the rotation in the horizontal direction is restricted (guide means), and a slight gap is provided between the guide hole 16 and the guide rod 22. Play is provided, and consideration is given to allow the displacement of the movable fulcrum lid 21 by the lowering guide surface 51 described later.

  A spring seat 24 is formed around the guide rod 22 on the lower surface of the movable fulcrum lid 21, and a compression spring 26 (attached between the spring seat 24 of the movable fulcrum lid 21 and the spring seat 18 of the swinging housing 11 is provided. Force means) is interposed. Due to the urging force of the compression spring 26, the movable fulcrum lid 21 is always urged upward with respect to the swinging casing 11, and the washer 23 at the lower end of the guide rod 22 is brought into contact with the washer contact surface 19 of the swinging casing 11. It is in contact.

In the plan view of FIG. 3, the outer shape of the movable fulcrum lid 21 is larger than the burl hole 7 of the lid body 3 in the center, the outer circumferential direction, and the left-right direction. At the same time, a rubber packing 32 is mounted around the pressing portion 31 so that the contact surface 33 is formed on the packing 32.
Due to the upward biasing force of the compression spring 26 described above, the movable fulcrum lid 21 makes the contact surface 33 the burr hole 7 on the lower surface of the lid body 3 with the pressing portion 31 fitted in the burl hole 7 of the lid body 3. , Thereby closing the burl hole 7 to provide a sufficient water stoppage (hereinafter referred to as a closed position). When the movable fulcrum lid 21 descends against the urging force of the compression spring 26 from this state, the pressing portion 31 of the movable fulcrum lid 21 is released downward from the burl hole 7 and the contact surface 33 is the lid body 3. As a result, the burl hole 7 is opened. Further, in the closed position of the movable fulcrum lid 21, the swinging casing 11 is shown by a solid line in FIG. 2 due to the reaction force of the compression spring 26 urging the movable fulcrum lid 21 and the weight of the swinging casing 11 itself. It is held in the locked position.

A guide inclined surface 34 is formed at the outer peripheral end of the movable fulcrum lid 21 on the pressing portion 31, and the guide inclined surface 34 has a shape that rises substantially linearly toward the outer peripheral side of the lid body 3. The shape of the guide inclined surface 34 is set in accordance with the shape of the engaging portion 41a formed at the tip of the bar 41. Here, the shape of the tip of the bar 41 will be described.
The bar 41 applied to the bite release structure 5 and the locking structure 6 of the lid 1 for an underground structure according to the present embodiment, which is simply expressed, is, for example, the same general bar as that applied to the above-mentioned Patent Document 1. There is an engaging portion 41 a that is substantially T-shaped and orthogonal to the burl 41 at its tip. In the plan view shown in FIG. 3, the horizontal dimension A of the burl hole 7 is set to be wider than the width W of the engaging portion 41a of the burl 41 and narrower than the length L of the engaging portion 41a.

  Accordingly, in a posture in which the engaging portion 41a of the burl 41 is aligned along the center and the outer peripheral direction, the engaging portion 41a can be inserted into the burl hole 7 from above, and after the insertion into the burl hole 7, the engaging portion 41a is inserted. When the angle is changed by 90 ° in the horizontal direction and along the left and right direction, the engaging portion 41 a is brought into contact with and latched on the lower surface of the lid body 3 on both the left and right sides of the burl hole 7. Then, chamfered guide inclined surfaces 41b are formed at both ends of the engaging portion 41a so as to face the tip end side of the burl. As described above, the engaging portion 41a is positioned along the center and the outer peripheral direction. Any one of the inclined guide surfaces 41 b corresponds to the inclined guide surface 34 of the movable fulcrum lid 21.

  As shown in FIG. 4, lower guide surfaces 51 are formed on the left and right support arms 12 of the swinging casing 11 so as to face the center side of the lid body 3. It is inclined in an arc shape so as to be closer to the center, and the lower part is formed substantially vertically. Guide pins 52 project from the left and right sides of the movable fulcrum lid 21 so as to correspond to the descending guide surfaces 51, and the movable fulcrum lid 21 closes the burl hole 7 of the lid body 3 as described above. In the state where each guide pin 52 is located immediately above the lowering guide surface 51 of the swinging housing 11, when the movable fulcrum lid 21 is lowered, each guide pin 52 is moved down on the lowering guide surface 51 from the upper side to the lower side. The movable fulcrum lid 21 descends while being displaced slightly toward the center along the descending guide surface 51, and the position displacement at this time is allowed by play between the guide hole 16 and the guide rod 22.

  On the other hand, a stopper projection 53 protrudes downward from the outer peripheral end of the movable fulcrum lid 21, and this stopper projection 53 is positioned immediately above the engagement projection 15 of the receiving frame 2. A flat stopper surface 54 is formed on the upper surface of the engaging protrusion 15 so as to correspond to the stopper protrusion 53, and a stepped portion 55 is formed to protrude upward on the center side of the stopper surface 54. When the movable fulcrum lid 21 is lowered by the guide rod 22, the further downward movement of the movable fulcrum lid 21 is regulated by bringing the stopper projection 53 into contact with the stopper surface 54 of the receiving frame 2 (hereinafter referred to as a fulcrum position). At this fulcrum position, the stepped portion 55 prevents the displacement of the stopper projection 53 toward the center, and the engagement of the bar 41 between the upper surface of the movable fulcrum lid 21 and the lower surface of the lid body 3 is achieved. A gap into which the portion 41a can enter is formed.

The biting release structure 5 and the locking structure 6 of the underground structure lid 1 of the present embodiment are configured as described above. Next, procedures for opening and closing the lid body 3 will be described.
First, when the lid body 3 shown in FIG. 2 is closed, the movable fulcrum lid 21 is urged upward by the urging force of the compression spring 26 and held in the closed position, and the pressing portion 31 is held in the lid body 3. And the abutting surface 33 abuts against the lower surface of the lid body 3 to close the burl hole 7. Further, at this time, the rocking casing 11 is held in the locked position suspended from the lid body 3 by the reaction force and its own weight of the compression spring 26, and the engaging claw 14 is positioned below the engaging projection 15 of the receiving frame 2. When the swinging casing 11 is raised together with the lid main body 3, the engaging claw 14 engages with the engaging projection 15 of the receiving frame 2 from below to restrict the opening.

Accordingly, it is possible to reliably prevent rainwater and the like from flowing into the underground structure through the burr hole 7 and to open the lid due to overflow or the like in the underground structure or illegal dumping. Opening by the three parties is prevented in advance.
The lid opening operation from this state is performed through a two-stage operation of releasing bite and unlocking.
First, as an operation for releasing the bite, as shown in FIG. 2, the bar 41 is in an upright posture slightly inclined toward the center of the lid body 3, and the engaging portion 41 a is set along the center and the outer peripheral direction of the lid body 3. Insert into the burl hole 7 from above. The pressing portion 31 of the movable fulcrum lid 21 is pushed downward by the engaging portion 41a of the inserted bar 41, and the movable fulcrum lid 21 gradually descends against the urging force of the compression spring 26, as shown in FIG. The stopper projection 53 is switched to the fulcrum position where the stopper projection 53 is brought into contact with the stopper surface 54 of the receiving frame 2. The movable fulcrum lid 21 at the time of lowering is displaced slightly to the center side while sliding the guide pin 52 on the lowering guide surface 51, so that the movable fulcrum lid 21 is lowered without interfering with the inner periphery of the lid body 3.

  Next, when the burl 41 is pivoted to the outer peripheral side of the lid body 3 to be substantially upright, the guide inclined surface 41b on the outer peripheral side of the engaging portion 41a is slidably contacted on the guide inclined surface 34 of the movable fulcrum lid 21. It moves toward the center side of the main body 3. As a result, as shown in FIG. 6, the guide inclined surface 41 b of the engaging portion 41 a corresponds to the guide inclined surface 34 of the movable fulcrum lid 21, and the center side end of the engaging portion 41 a of the burl 41 is the lower side of the lid body 3. Break into.

  In this state, when the burl 41 is further swung to the outer peripheral side of the lid body 3 as shown in FIG. 7, the lowering of the movable fulcrum lid 21 is restricted by the stopper surface 54 of the receiving frame 2 as described above. The outer peripheral side end of the engaging portion 41a abuts on the pressing portion 31 of the movable fulcrum lid 21 and functions as a fulcrum, and the central end of the engaging portion 41a abuts on the lower surface of the lid body 3 and functions as an action point. The swinging operation portion of the upper end of the bar 41 functions as a power point, and a strong upward force acts on the lid body 3 by the lever principle. Therefore, even if the lid main body 3 bites into the receiving frame 2 by taper fitting, the biting is easily and reliably released.

  This completes the bite release operation and continues the unlocking operation. First, the bar 41 that has been swung to the outer periphery side is once returned to a substantially upright posture as shown in FIG. 8, and then the engaging portion 41a is changed by 90 ° in the horizontal direction as shown by the solid line in FIG. The posture is along the left-right direction. As a result, both ends of the engaging portion 41a of the burl 41 are brought into contact with the lower surface of the lid main body 3 on both the left and right sides of the burl hole 7 and hooked. In this state, as shown by the phantom line in FIG. 9, when the engaging portion 41 a of the bar 41 is moved to the outer peripheral side, the pressing portion of the engaging portion 41 a against the movable fulcrum lid 21 is accordingly the axis C of the compression spring 26. Since it moves further to the outer peripheral side, a moment acts on the swinging housing 11 in the direction of moving the lower part to the center side by the reaction force of the compression spring 26 around this pressed portion. However, at this time, the stopper projection 53 of the movable fulcrum lid 21 is prevented from moving toward the center by the step portion 55, so that the swinging casing 11 is held in an upright posture.

  Then, as shown in FIG. 10, when the lid body 3 is slightly lifted together with the bar 41, the stopper projection 53 gets over the stepped portion 55, so that the swinging casing 11 is caused by the moment generated by the reaction force of the compression spring 26. The lower part is swung so as to move to the center side. As a result, the swinging casing 11 is switched to the unlocking position, and the engaging claw 14 is retracted from below the engaging projection 15 of the receiving frame 2 to be unlocked. The operation is complete. In this state, when the burl 41 is lifted upward as shown in FIG. 11, the lid body 3 hooked to the engaging portion 41 a is lifted from the receiving frame 2 together with the movable fulcrum lid 21 and the swinging casing 11. The lid body 3 can be opened by turning it horizontally or by inverting it vertically via the hinge structure 4.

  When the lid body 3 is closed, the swinging casing 11 is left in a free state, and the lid body 3 is placed in the receiving frame 2 as it is, so that the swinging casing 11 is caused by the reaction force and its own weight of the compression spring 26. The movable fulcrum lid 21 is switched to the closed position by the urging force of the compression spring 26 to close the burl hole 7 while being switched to the locking position to prevent the lid body 3 from being opened.

  As described above, in the biting release structure 5 for the underground structure lid 1 of the present embodiment, the water stoppage between the inner peripheral surface of the receiving frame 2 is ensured by closing the outer peripheral side of the burl hole 7 of the lid body 3. In addition, in place of the peripheral edge of the receiving frame 2 that can no longer be used as a fulcrum for releasing the bite of the lid body 3, the movable fulcrum lid 21 that closes the burr hole 7 is lowered to contact the stopper surface 54 of the receiving frame 2. At this time, the movable fulcrum lid 21 is used as a fulcrum when the cover body 3 is released from biting. Accordingly, when the bite is released, the top of the movable fulcrum lid 21 can be opened by applying a force upward using the pressing surface 31 of the movable fulcrum lid 21 as a fulcrum and the lower surface of the lid main body 3 corresponding to the center side of the burr hole 7 as an action point. As long as the engaging portion 41a of 41 has such a shape that the one side and the other side can be brought into contact with these fulcrums and action points, the lid can be opened utilizing the principle of lever.

  Therefore, the bar 41 having the above-described general engaging portion 41a can be used without requiring a bar having a special shape as described in Patent Document 2, for example, a general format assumed by Patent Document 1 Even in the maintenance work in the area where the underground structure lid of the present embodiment and the underground structure lid 1 of the present embodiment are mixed, maintenance is not performed with a heavy burden by simply carrying the general bar 41 described above. The advantage is that the work can be carried out.

  In addition, in order to make the lower surface of the lid main body 3 corresponding to the center side of the burl hole 7 function as an action point, after the engaging portion 41a of the burl 41 is inserted into the burl hole 7, the engaging portion 41a is moved to the lid main body 3 It is necessary to move to the lower side of the lid body 3 by moving it to the center side. For this purpose, operations different from other operations performed on the upper portion of the bar 41, such as holding the lower portion of the bar 41 and moving it to the center side, are complicated, but in this embodiment, the operation is complicated. The engaging portion 41a of the burl 41 is naturally brought into contact with the lid main body 3 by sliding contact between the guide inclined surface 41b of the engaging portion 41a and the guide inclined surface 34 of the movable fulcrum lid 21 simply by bringing 41 into a substantially upright posture. Therefore, it is only necessary to hold and swing the upper portion of the bar 41 as in other operations, and there is an advantage that it can be executed very easily.

  On the other hand, in this embodiment, since the bite release structure 5 and the locking structure 6 are configured in relation to each other without being completely independent, the bite release operation and the unlocking operation of the lid body 3 are continuously performed. It can be executed as a series of bar operations. Specifically, in the present embodiment, the movable fulcrum lid 21 is supported so as to be movable up and down with respect to the swinging casing 11 that locks and unlocks the lid main body 3 in accordance with the swinging. After the movable fulcrum lid 21 is switched to the fulcrum position by pressing the bar 41 to release the bite of the lid main body 3, the movable fulcrum lid 21 is simply moved to the outer peripheral side of the lid main body 3. Thus, the swinging housing 11 can be swung and switched to the unlocked position. That is, both the biting release operation and the unlocking operation of the lid body 3 can be completed as a series of continuous bar operations performed by inserting the engaging portion 41a of the bar 41 into the bar hole 7, so that, for example, the bite release structure 5 Both operations can be performed quickly and easily compared to when both operations are performed separately, as in the case where the locking structure 6 is provided completely separately.

  This is the end of the description of the embodiment, but the aspect of the present invention is not limited to this embodiment. For example, in the embodiment described above, the underground structure lid 1 having the locking structure 6 in addition to the biting release structure 5 is embodied, but the lock structure 6 is not necessarily provided, and the underground structure having only the biting release structure 5 is provided. The structure lid 1 may be embodied. In this case, the movable fulcrum lid 21 supported so as to be movable up and down with respect to the swinging casing 11 in the above embodiment is supported upward by the compression spring 26 after being supported so as to be movable up and down with respect to the lid body 3. What is necessary is just to comprise so that it may.

  In the above embodiment, the movable fulcrum lid 21 is linearly guided in the vertical direction. However, the movable fulcrum lid 21 is lowered by the pressing of the engaging portion 41a of the burl 41 and comes into contact with the stopper surface 54 on the receiving frame 2 side. In addition, the guide of the movable fulcrum lid 21 is not limited to a straight line as long as the gap can be formed between the lower surface of the lid body 3 and the engaging portion 41a of the burl 41. Therefore, for example, in FIG. 2, the center side end of the movable fulcrum lid 21 is swingably supported by the hinge, and the outer peripheral side end of the movable fulcrum lid 21 is swung downward by the pressing of the engaging portion 41 a of the bar 41. It may be configured such that the gap is formed between the upper surface of the movable fulcrum lid 21 and the lower surface of the lid body 3 while being brought into contact with the stopper surface 54 on the second side.

It is sectional drawing which shows the erosion cancellation | release structure of the cover for underground structures of embodiment. It is a partial expanded sectional view which shows the biting cancellation | release structure and locking structure at the time of lid closing of a lid main body. It is the III-III sectional view taken on the line of FIG. It is a disassembled perspective view which shows a rocking | fluctuation housing, a compression spring, and a movable fulcrum lid. It is explanatory drawing of the biting cancellation | release procedure when a movable fulcrum lid | cover is switched to a fulcrum position by the press of bar. It is explanatory drawing of the biting cancellation | release procedure when the engaging part of a bar is moved to the center side with a guide inclined surface. It is explanatory drawing of the biting cancellation | release procedure at the time of releasing biting by the lever principle. It is explanatory drawing of the unlocking procedure when a bar is returned to an upright. It is explanatory drawing of the unlocking procedure when the angle of the bar is changed in the horizontal direction. It is explanatory drawing of the unlocking procedure when switching a rocking | fluctuation housing to an unlocking position. It is explanatory drawing of the unlocking procedure when a lid main body is pulled up with a bar.

Explanation of symbols

2 Receiving frame 3 Lid body 7 Bar hole 11 Oscillating housing (oscillating member)
14 engaging claw 15 engaging protrusion 16 guide hole (guide means)
21 Movable fulcrum lid 22 Guide rod (guide means)
26 Compression spring (biasing means)
34 Guide inclined surface 41 Bar 41a Engaging portion 54 Stopper surface (stopper portion)

Claims (3)

A receiving frame installed at the upper end of the underground structure;
A lid body that is detachably fitted in the receiving frame to close the receiving frame, and has a bar hole penetrating a bar opening for inserting the engaging portion of the bar for opening and closing the lid at a position spaced from the outer peripheral edge toward the center;
When urged upward by the urging means to close the burl hole of the lid body from below and pressed from above by the engaging portion of the crowbar, it resists the urging force of the urging means. A movable fulcrum lid that descends to open the burl hole and forms a gap with the lower surface of the lid body;
A stopper portion that is formed on the inner periphery of the receiving frame and that abuts against the movable fulcrum lid when the movable fulcrum lid descends against the urging force of the urging means and restricts the descent. Escape release structure of the lid for underground structures. A receiving frame installed at the upper end of the underground structure;
A lid body that is detachably fitted in the receiving frame to close the receiving frame, and has a bar hole through which a bar opening for opening and closing a bar for opening and closing the lid can be inserted at a position spaced from the outer periphery to the center side;
The lid body is supported so as to be swingable below the burl hole of the lid body, and an engagement claw is engaged with an engagement projection provided on the receiving frame to restrict the lid body from being opened. A rocking member that is rocked by an engagement portion and capable of releasing the engagement of the engagement claw with respect to the engagement protrusion;
The swinging member is supported by the guide means so as to be movable up and down, biased upward by the biasing means to close the burl hole of the lid body from below, and by the engaging portion of the burl A movable fulcrum lid that, when pressed from above, descends against the urging force of the urging means to open the burl hole and to form a gap with the lower surface of the lid body;
A stopper portion that is formed on the inner periphery of the receiving frame and that abuts against the movable fulcrum lid when the movable fulcrum lid descends against the urging force of the urging means and restricts the descent. Escape release structure of the lid for underground structures.   On the upper surface of the movable fulcrum lid, when the movable fulcrum lid descends against the urging force of the urging means by being pressed by the engaging portion of the bur, the engaging portion of the burl is brought into sliding contact. 3. A structure for canceling the bite of the lid for an underground structure according to claim 1 or 2, wherein a guide inclined surface is formed to be moved below the lid body.

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