JP3862268B2 - Locking structure of the lid for underground structures - Google Patents

Description

The present invention relates to a locking 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.

  In an underground structure lid provided with a locking structure for locking the lid main body and the receiving frame, an opening for inserting an opening / closing tool when unlocking and opening the lid is provided at the peripheral edge of the lid main body. It is common. In order to prevent rainwater or earth and sand from flowing into the opening provided on the peripheral edge of the lid body and increasing the processing load at the sewage treatment plant, the opening has been conventionally blocked with a closing plate or the like. As an example of this, there is an opening closing device for an underground structure lid shown in Patent Document 1.

The opening closing device has an opening for inserting the opening tool at the peripheral edge of the lid body, and has a size for closing the opening, and is pressed by the opening tool inserted from the opening. The closing plate that opens inward is formed of rubber or synthetic resin, and in the closed state, the movable end of the closing plate is in contact with the inner periphery of the frame to close the opening.
Japanese Utility Model Publication No. 7-2715 (Fig. 1)

  However, in the opening portion closing device described above, the upper surface of the closing plate is at a certain height lower than the surface position of the lid body, and there is a space portion in the opening portion. There is a problem that it is difficult to open and close with an open / close tool when the lid is opened, and that the blocking plate formed of rubber or synthetic resin deteriorates early due to contact with earth and sand, thereby impairing the water stop effect.

In addition, since the opening is closed by bringing the tip of the closing plate into contact with the inner periphery of the receiving frame, the tip of the closing plate and the inner periphery of the frame body are rubbed each time the opening / closing tool is inserted. There was also a problem that the obstruction plate deteriorated due to secular change and the water stop effect was impaired.
The present invention has been made in view of the above points, and provides a locking structure for a lid for an underground structure that reliably prevents the inflow of rainwater and earth and sand into a manhole for a long period of time and reliably exhibits a locking function. Aim to do.

In order to achieve the above object, according to the first aspect of the present invention, there is provided a lock main body provided with an engaging projection for engaging with the lock seat of the receiving frame and pivotally supported below the opening of the lid main body, and an elastic member on the lock main body. consists of a closure member which is mounted for pressing through said closure member includes: the cover first closing portion and fitted into the opening portion capable of closing the opening of the body, the opening subordinates of said lid body A second closing portion that is formed on the side and can be fitted into a hollow cylindrical portion larger than the opening, and a third closing portion that can be brought into contact with the lower surface of the cylindrical portion , the second and second It is characterized in that the three closed portions can cooperate with each other to close the cylindrical portion .

When the lid body is fitted to the receiving frame and closed, the engaging projection of the lock body is located at the locking position in the lock seat of the receiving frame and is in the locked state. The closing member has the first closing portion fitted into the opening by the elastic member, the second closing portion is formed below the opening of the lid body, and is fitted into a large hollow cylindrical portion by the opening , The third closing part abuts the lower surface of the cylindrical part, so that the opening of the lid body is always elastically closed by the first closing part, while the cylindrical part cooperates with each other. It is blocked at the part . As described above, the opening of the lid main body and the cylindrical portion formed therebelow are always elastically closed by the closing member, so that rainwater and earth and sand can be reliably prevented from flowing into the manhole. In addition, it is possible to prevent unexpected unlocking when turbulent pumped water is generated in a manhole or when an underground structure lid is installed on a slope.

When opening the lid, press the indented portion formed on the tip side of the opening tool from the opening of the lid body, push down the closing member, and then rotate the opening tool, the indented portion will push down the lock body. The engaging protrusion is separated from the lock seat of the receiving frame and unlocked.
In the invention of claim 2, the third closing portion is provided with an elastic sealing material.
In the invention of claim 3, when the closing member is pressed and lowered, a guide surface is provided on the lock body for guiding the descending trajectory of the closing member so that the closing member is pressed and lowered. The convex portion that slides on the guide surface is provided in the third closing portion.

According to the first aspect of the present invention, the opening of the lid body is always elastically closed by the first closing part, and the cylindrical part formed below the opening is always elastically closed by the second closing part and the third closing part, respectively. Therefore, inflow of rainwater and earth and sand into the manhole can be reliably prevented. That is, since the opening of the lid body is closed by the insertion of the first closing part , the inflow of earth and sand is prevented, and the cylindrical part is formed by the insertion of the second closing part and the contact of the third closing part. Since the second and third blocking portions are in close contact with the inner surface and the lower surface, respectively , the inflow of rainwater or the like is prevented. Further, according to the invention of claim 1, it is possible to prevent unexpected unlocking when turbulent uplift occurs in the manhole or when the underground structure lid is installed on a slope.

According to the second aspect of the present invention, since the third sealing portion is provided with the elastic sealing material, the sealing performance of the lower surface of the cylindrical portion by the third blocking portion is improved, and the intrusion of rainwater is more reliably prevented. be able to. Moreover, since the elastic sealing material provided in the 3rd obstruction | occlusion part does not receive the load by a vehicle passage directly, or contacts with earth and sand, it can maintain water-stopper for a long term.
According to the invention of claim 3, when the closing member is pushed down and raised by the restoring force by the elastic member, the convex portion provided in the third closing portion is guided by the guide surface of the lock body, It is possible to prevent the downward or upward trajectory from being shifted. For this reason, when the closing member is lifted by the restoring force of the elastic member after the opening / closing operation is completed, the opening, the cylindrical portion, and the lower surface of the cylindrical portion can be reliably closed.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a cross-sectional view of an underground structure lid to which the locking structure for an underground structure lid according to the present invention is applied. The underground structure lid 1 has a circular shape in plan view, which includes a receiving frame 2 and a lid body 3 in which an edge winding portion 3a is attached to the inner peripheral surface 2a of the receiving frame 2 by taper fitting. The main body 3 is installed so as to be flush with the ground surface. The lid body 3 is connected to the receiving frame 2 by a hinge mechanism 4 provided on one side, and is engaged with the receiving frame 2 by a locking structure 5 provided on the other side to prevent opening and lifting due to internal pressure or the like. Has been. When the lid body 3 is opened, the indented portion 20a formed at the tip of the burl 20 (FIG. 9) as a lid-opening tool is formed in the opening portion 3b opened from the outer peripheral upper surface of the lid body 3 to the middle of the edge winding portion 3a. Is inserted and unlocked, and is pulled up above the receiving frame 2 by the bar 20 and is opened through the hinge mechanism 4 by horizontal turning or vertical inversion.

A lock seat 2b is recessed in the receiving frame 2 at a position corresponding to the lock body 11 constituting the lock structure 5 at the lower part of the inner peripheral surface 2a, and a lock projection 2c is formed at the upper opening edge of the lock seat 2b. It is provided to face. The locking protrusion 2c is configured such that the engaging protrusion 11a of the lock body 11 can be engaged when the lid body 3 is pulled up or pushed up by lifting pressure.
FIG. 2 is a perspective view of the opening 3b of the lid body 3 as viewed obliquely from below, and a rectangular tubular portion 3c larger than the opening 3b is provided below the opening 3b. The lower surface 3d of the portion 3c is an inclined surface that is inclined obliquely upward in the center direction of the lid body from the vicinity of the lower end of the edge winding portion 3a. Further, triangular projections 3f and 3f each having a mountain shape are provided on the lower surfaces of the left and right sides of the opening 3b.

  On the lower surface of the lid body 3, support portions 6 that support the lock body 11 are integrally formed on the left and right sides of the lower surface 3d of the cylindrical portion 3c. Slits 6b and 6b as bearings for the lock body 11 are provided on the inner surfaces of the left and right side walls 6a and 6a of the support portion 6 so as to face each other, and these slits 6b are directed from the edge winding portion 3a side toward the center of the lid body. It opens horizontally and toward the center. A mounting portion 6d is provided at the center of the rear wall 6c, and a bolt hole 6e is provided.

  3 shows an exploded perspective view of the locking body 7 constituting the locking structure 5 shown in FIG. 1, and FIG. 4 shows a perspective view seen from the back of the lock body 11 shown in FIG. As shown in FIGS. 3, 4 and 6, the lock body 11 of the locking body 7 has an engagement protrusion 11 a extending in a substantially V shape obliquely upward from the lower end side on the front side (the outer peripheral side of the lid body 3). The weight part 11b is formed at the rear lower position. A hollow portion 11c (FIG. 8) is provided in the vertical direction between the engaging protrusion 11a and the weight portion 11b to reduce the weight. Support shafts 11e and 11e are respectively formed on the upper ends of both side portions 11d and 11d so as to protrude laterally, and guide surfaces 11f and 11f are provided on the front side of the inner surface from the upper portion to a position near the connection portion with the engaging protrusion 11a. It has been. These left and right guide surfaces 11f and 11f can be slidably contacted with the side surfaces of the guide convex portions 12h and 12h (FIG. 3) provided at the left and right corners of the front portion of the closing member 12. It has a function as a guide surface that suppresses displacement in the direction. The upper part of the weight part 11b is a spring seat 11h, and a square hole 11g is provided in the center in the vertical direction so that its axis is slightly rearward (center side of the lid body) from the support shaft 11e. The lower portion of the square hole 11g has a large diameter as shown in FIG. 8, and a stopper 16 fixed to the lower end of the support shaft 12d of the closing member 12 is movable.

  As shown in FIGS. 3 and 5, the closing member 12 is attached to the lock body 11 so as to be pressable, and closes the opening 3 b of the lid body 3 and the cylindrical portion 3 c formed below the opening 3 b so as to be openable and closable. Thus, the first closing portion 12a that fits into the opening 3b, the second closing portion 12b that fits into the cylindrical portion 3c (space portion), the third closing portion 12c that contacts the lower surface 3d of the cylindrical portion 3c, It comprises a support shaft 12d provided to extend obliquely downward on the lower surface of the third closing portion 12c.

  The first closing part 12a can be closed by being inserted into the opening 3b from below. The second closing part 12b is formed to extend laterally on both right and left sides of the first closing part 12a, and is accommodated in the cylindrical part 3c (space part) so as to be movable in the vertical direction, thereby closing the cylindrical part 3c. It is possible. The third closing portion 12c is provided below the second closing portion 12b, and its upper surface is in contact with the lower surface 3d of the cylindrical portion 3c so that it can be closed. The connecting portion 12e of the second closing portion 12b and the third closing portion 12c is provided with slits 12f, 12f for engagement from the front surface to the rear surface on both the left and right sides, and the upper surface 12g of the connecting portion 12e extends from the front end. The inclined surface is inclined obliquely upward toward the rear end. Guide convex portions 12h and 12h are provided to protrude downward at the left and right corners on the front side of the third closing portion 12c. The support shaft 12d has a prismatic shape, is fitted into a square hole 11g provided in the weight portion 11b of the lock body 11, and is slidable. A projection 12i is provided at the lower end.

As shown in FIGS. 3 and 5, the packing 13 as an elastic seal material is attached to the third closing portion 12c of the closing member 12 and seals the lower surface 3d of the cylindrical portion 3c. 2 Engagement portions 13b having U-shaped ridges are provided on the upper surfaces of the front edge and both side edges of the hole 13a through which the blocking portions 12a and 12b are passed. Cutouts 13c are provided on the inner lower surfaces of both side portions of the engaging portion 13b to engage with the side surfaces and the upper surface 12g of the connecting portion 12e of the closing member 12 and engage with each other. In addition, engaging portions 13d for externally fitting and fixing to both side portions and the rear portion of the third closing portion 12e are provided in a flange shape on both sides and rear portions of the outer peripheral surface. This packing 13 is formed of a rubber member.

The packing 13 is fitted into the slits 12f and 12f of the connecting portion 12e through the first and second closing portions 12a and 12b of the closing member 12 into the hole 13a from below, and the left and right notches 13c of the engaging portion 13b are continuously provided. The upper and lower side surfaces of the portion 12e are fitted and engaged with the upper edge of the upper surface 12g and the lower surface is in contact with the upper surface of the third closing portion 12c, and the engaging portion 13d is attached to both sides and the rear portion of the third closing portion 12c. Fitted. In this way, the packing 13 is attached and fixed to the upper surface of the third closing portion 12c of the closing member 12.
As shown in FIG. 3, the support shaft 12d of the closing member 12 is inserted into the square hole 11g of the spring seat 11h of the lock body 11 via a coil spring 14 and a dustproof boot 15 as elastic members, and is projected at the lower end. A stopper (washer) 16 as a stopper member is attached to the portion 12i and fixed by caulking. In this way, the closing member 12 is attached to the lock body 11 so as to be slidable in the vertical direction. FIG. 6 is an assembled side view of the locking body 7 shown in FIG.

In the locking body 7, the first closing portion 12a of the closing member 12 is inserted from below into the opening 3b of the lid main body 3 shown in FIG. 2, and the second closing portion 12b is inserted into the cylindrical portion 3c (space portion). The upper surface of the packing 13 attached to the third closing portion 12c is brought into contact with the lower surface 3d of the cylindrical portion 3c, and the left and right support shafts of the lock body 11 are fitted to the slits 6b and 6b of the side walls 6a and 6a of the support portion 6. 11e and 11e are inserted and cannot be deviated by the fixing member 8 as shown in FIG. The fixing member 8 has a U-shape, the center portion 8a is fixed to the bolt hole 6e of the mounting portion 6d of the support portion 6 by bolts 9 and nuts 10, and both side portions 8b and 8b extend along the side walls 6a and 6a. extended forward, the support shaft 11e of the tip lock body 11, 11e and these support shafts 11e and pairs countercurrent to exist a slight gap, pivotable 11e slit 6b, in 6b, and non departing To support. In this way, the locking body 7 is pivotally supported below the opening 3 b of the lid body 3.

The operation will be described below.
As shown in FIGS. 1 and 8, when the lid body 3 is fitted to the receiving frame 2, the lock body 11 is suspended by the weight portion 11b and is urged to the locking position by its own weight. The lock main body 11 is positioned below the lock protrusion 2c with the engagement protrusion 11a entering the lock seat 2b of the receiving frame 2 at the lock position. In this state, the closing member 12 is pushed up by the spring force of the coil spring 14, the first closing portion 12a is fitted into the opening 3b, the second closing portion 12b is fitted into the cylindrical portion 3c (space portion), The packing 13 of the three closed portions 12c is in close contact with the lower surface 3d of the cylindrical portion 3c. Thereby, the opening 3 b is closed by the closing member 12. Further, the lock body 11 is urged to the locking position by the reaction force of the third closing portion 12c of the coil spring 14 in addition to the above-described urging by its own weight, so that play is suppressed and held in the locking position.

  When the lid main body 3 is pulled up to be opened by a person other than the operator in this closed state, or when lifting pressure from the inside of the manhole is applied to the lid main body 3 and pushed up, the lock body 11 The engaging protrusion 11a engages with the locking protrusion 2c of the receiving frame 2 and is prevented from moving upward. Thereby, the lid body 3 is prevented from being opened. The opening 3b of the lid body 3 is always elastic by the first closing part 12a, the cylindrical part 3c (space part) is by the second closing part 12b, and the lower surface 3d of the cylindrical part 3c is always elastic by the third closing part 12c. Therefore, inflow of rainwater and earth and sand into the manhole can be reliably prevented. Further, the lock body 11 is held in the locked position by the spring force of the coil spring 14 so that the turbulent pumped water is generated in the manhole or the underground structure lid is sloped. Unexpected unlocking when installed in

  When the lid body 3 is opened, a dedicated bar 20 is used as shown in FIG. The bar 20 is formed such that the indented portion 20a at the tip has a substantially T shape, and the root portion 20b is inclined with respect to the shaft portion 20c (FIG. 10). The operator inserts the indented portion 20a of the bar 20 into the opening 3b of the lid body 3 as shown in FIG. 9, and resists the first closing portion 12a of the closing member 12 against the spring force of the coil spring 14 on the lower surface thereof. Press down. When the closing member 12 is pushed down, the side surfaces of the convex portions 12h at the front left and right corners of the third closing portion 12c come into contact with the left and right guide surfaces 11f of the lock body 11, and the guide surfaces 11f are slid. Move down. Thereby, when the closing member 12 descends, the deviation of the track is prevented, and the closing member 12 can be smoothly lowered.

As shown in FIG. 9, in the state where the closing member 12 is pushed down to the lower end position, the first closing portion 12a is pushed out below the opening 3b, the second closing portion 12b is pushed out below the cylindrical portion 3c, The packing 13 of the third closing part 12c is spaced apart from the lower surface 3d and located below.
Next, the bar 20 is rotated 90 ° so that the pressure portion 20a as shown in FIG. 10 straddling the opening 3 b, the left and right sides of the pressure portion 20a attracts bar 20 as shown in FIG. 11 in the direction of arrow A part of engaging the recess 3g between the inner surface of the protruding portion 3f and Enmaki portion 3a provided on the left and right sides of the opening 3b shown in FIG. 2, opening the top of the shaft portion 20 c of the reduction unit 20a portion When brought into contact with the open end of the inner peripheral surface 2a of the 3b paired countercurrent to receiving frame 2, the lock body 11 is rotated as indicated by arrow C, the engagement projection 11a is unlocked spaced from lock seat 2b The Next, when the operator pulls up the bar 20 in the direction of arrow B, the lid body 3 is lifted and opened.

  When the lid body 3 is closed, the lock body 11 is left in a free state, and the lid body 3 is placed on the receiving frame 2 as it is, so that the lock body 11 acts on the center of gravity of the weight portion 11b around the support shaft 11e. Is rotated and locked at the locking position. In addition, the closing member 12 is pushed up by the spring force of the coil spring 14 so that the first closing portion 12a is inserted into the opening 3b and the second closing portion 12b is inserted into the cylindrical portion 3c (space portion). The packing 13 of the portion 12c is in close contact with the lower surface 3d of the cylindrical portion 3c, and closes the opening 3b. At this time, since the convex portion 12h provided on the third closing portion 12c is guided by the guide surface 11f provided on the lock body 11, the trajectory of the closing member 12 can be prevented from being shifted, and the opening portion 3b and the cylindrical portion 3c. Can be reliably closed.

It is sectional drawing of the lid | cover for underground structures to which the locking structure of the lid | cover for underground structures concerning this invention is applied (Example). The perspective view which looked at the opening part of the lid | cover main body shown in FIG. 1 from diagonally downward is shown. It is the disassembled perspective view seen from diagonally upward of the locking body which comprises the locking structure shown in FIG. It is the perspective view seen from the back surface of the lock main body shown in FIG. It is a perspective view of the closure member and packing shown in FIG. It is an assembly side view of the locking body shown in FIG. It is sectional drawing which follows the arrow AA of the locking structure shown in FIG. It is explanatory drawing in the locked state of the locking structure shown in FIG. It is explanatory drawing of operation which pushes down a closure member at the time of unlocking. It is explanatory drawing in the case of pushing down the obstruction | occlusion member shown in FIG. 9, and transfers to unlocking operation. It is explanatory drawing which shows the completion | finish state of unlocking operation shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lid for underground structures 2 Receiving frame 2a Inner peripheral surface 2b Lock seat 2c Locking protrusion 3 Lid main body 3b Opening part 3c Cylindrical part 3d Lower surface 4 Hinge mechanism 5 Locking structure 6 Support part 7 Locking body 11 Locking body 11a Engagement protrusion 11b Weight portion 11f Guide surface 12 Closure member 12a First obstruction portion 12b Second obstruction portion 12c Third obstruction portion 13 Packing (elastic seal material)
14 Coil spring (elastic member)
15 boots 20 bar (opening tool)
20a Indentation

Claims (3)

It comprises an engagement projection that engages with the lock seat of the receiving frame and is pivotally supported below the opening of the lid body, and a closing member that is attached to the lock body via an elastic member so as to be depressible. the closure member, said the first closing portion and fitted into the opening of the lid body capable closing the opening, said opening being formed in the downward and the cylinder of the big hollow than the opening of the lid body A second closing portion that can be fitted into the shape portion, and a third closing portion that can be brought into contact with the lower surface of the cylindrical portion, and the second closing portion and the third closing portion cooperate with each other to form the cylinder. A structure for locking a lid for an underground structure, characterized by being capable of closing the shape portion .   The locking structure for a lid for an underground structure according to claim 1, wherein an elastic sealing material is provided in the third closing portion.   When the closing member is pressed and lowered, a guide surface is provided on the lock body for guiding the descending trajectory of the closing member so that the guide surface slides when the closing member is pressed and lowered. The lock | rock structure of the lid | cover for underground structures of Claim 1 which provided the convex part to perform in the said 3rd obstruction | occlusion part.

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