JP3752041B2 - Cover for underground structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lid for an underground structure for closing an opening of an underground structure such as a structure containing a buried object such as a water gate valve or a manhole structure.
[0002]
[Prior art]
As a lid for an underground structure, one having a key hole (bar hole) formed on the outer periphery is widely used, and when this lid for an underground structure is used, it is fitted into an opening of the underground structure. The opening of the underground structure can be opened by inserting and hooking the tip of a bar into the keyhole of the lid, and lifting and opening the lid. The keyhole may be a simple through-hole or notch-shaped one, but a bag-shaped or bottomed-shaped one is also used so that rainwater does not enter the underground structure, Furthermore, in order to prevent the lid from being easily opened and to prevent the keyhole from being filled with earth and sand, etc., a valve body having a valve lid is used, and the valve lid is formed as a through hole or a notch shape. A structure in which this valve body is attached to the back surface side of the underground structure lid so as to close the keyhole formed in is also adopted. The valve lid is energized so as to close the keyhole, and normally it must be pressed against the keyhole or the periphery of the keyhole, but the energization of the valve lid is a rotation that extends below the valve lid on the valve body. A moving part is formed, and the rear end part of the valve lid or the upper end part of the rotating part is rotatably attached to the back side of the cover for the underground structure, and the rotating part is pushed by a spring, or the rotating part This is done by providing a weight on the spring or by using a spring and a weight together. By pushing down the valve lid closing the key hole against the urging force of the spring or weight, the key hole can be opened and the tip of the club can be inserted. The rotating part may also be equipped with a locking means to prevent the underground structure lid from rising significantly due to an abnormal increase in pressure in the underground structure, and it usually extends considerably below the valve lid. It is.
[0003]
[Problems to be solved by the invention]
By the way, when opening the underground structure by moving the lid for the underground structure, the lid for the underground structure will be placed on the road near the opening with the back side down after being lifted with a club. The lower end of the rotating part of the valve body is in contact with the road surface. Since it is not appropriate to work with the club inserted into the keyhole, the club is once removed from the keyhole. However, when the cover for the underground structure is returned to the opening, the club is inserted again into the keyhole. Move it by dragging. If the cover for the underground structure remains in the state where the club is pulled out, the club can be inserted as it is, but after removing the club, the lid is often moved slightly by hand or foot. In this case, the valve body may swing and the valve lid may close the key hole. In particular, when the lower end of the rotating part is formed in a shape that lacks stability, even if the lid is shaken, the valve body swings and the valve lid closes the key hole. When a spring means such as a spring that urges the valve to be closed is attached, the urging force of the spring means is also applied, so that the valve body swings in a direction that easily closes the key hole. When the valve lid closes the keyhole, the club must be inserted to push down the valve lid, but the rotating part of the valve body is pressed against the road surface due to the weight of the lid body for the underground structure. Therefore, when the weight of the lid body is large, the valve lid cannot be easily pushed down. Therefore, after the lid for the underground structure is lifted up slightly by other workers and the rotating part is not in contact with the road surface, the club is inserted into the keyhole. In some cases, it is preferable that one worker inserts the club into the key hole and drags the lid for the underground structure back to the opening of the underground structure.
[0004]
In addition, the lid for underground structures may have a hinge connected to the underground structure. In this case, the lid can be opened by rotating the keyhole upward about the hinge. However, when the weight of the lid is large, the lid is usually opened by pulling the lid with a stick along a road surface or the like around a hinge and turning it. When the lid is opened by turning, the lower end of the rotating part of the valve body will also come into contact with the road surface. As a result, the insertion work of the club is also complicated when the lid is pulled to turn in the opposite direction and returned to the opening It becomes.
[0005]
Therefore, an object of the present invention is to provide a lid for an underground structure in which a stick can be easily inserted into a key hole even when the rotating portion of the valve body is in contact with a road surface or the like.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the lid for an underground structure of the present invention has a key hole, and closes the opening of the underground structure in which a valve body that closes the key hole is swingably attached to the back surface side. When the valve body swings in the direction of opening the key hole at the lower end of the valve body, the frictional force acting between the valve body and the contact ground is reduced. The basic configuration is that the frictional force reducing means is provided. The present invention relates to a lid for an underground structure in which the lower end of the valve body comes into contact with the road surface or the like when placed on the road surface or the like with the back side facing down, more specifically, the lower end of the valve body reduces the weight of the lid body. The present invention relates to a lid for an underground structure that is received and pressed against a road surface or the like.
[0007]
When the valve body swings in the direction of opening the key hole, the frictional resistance from the contact ground acting on the valve body is small. Therefore, even if the cover for the underground structure is placed on the road surface, etc., with the lower end of the valve body in contact with the road surface, etc., and the valve body closes the key hole, the valve body portion facing the key hole The valve body can be easily swung by simply pushing down with the tip of the club, etc., to open the key hole, and the club can be inserted into the key hole. The valve body is usually composed of a valve lid and a rotating portion extending downward from the valve lid, so that the valve lid can swing in the vertical direction, that is, the upper surface of the lid body for the underground structure. The pivoting part is pivotally attached to the back side of the lid body so that it can swing along a plane perpendicular to the axis or the tip of the valve lid moves up and down. The valve lid rises to close the keyhole, and descends to open the keyhole. In many cases, the key hole is formed so as to cut out the outer peripheral edge of the lid body. However, the key hole may be a through-hole penetrating from the upper surface to the lower surface provided on the outer peripheral portion or more inside.
[0008]
When the valve body swings from the closed state to the keyhole direction, the lower end of the valve body on the side of the keyhole from the mounting position is usually the lowermost end, and therefore the keyhole rather than the mounting position. The lower end of the valve body contacts the ground. Therefore, the frictional force reducing means should be provided at the lower end portion of the valve body closer to the keyhole than the attachment position of the valve body to the underground structure lid.
[0009]
When the cover for the underground structure is returned to the opening of the underground structure, the bar is moved while being dragged in the state of being inserted into the key hole, so that the lower end of the valve body moves while rubbing the ground. Therefore, a sliding part that facilitates this movement at the lower end of the valve element that contacts the ground when the club is inserted into the keyhole, that is, a sliding part that makes it easy to drag the lid for the underground structure is configured. Is preferred. The sliding portion is configured closer to the keyhole than the frictional force reducing means, and is provided at the lower end of the valve body that comes into contact with the ground when the club is inserted into the keyhole. The sliding portion is configured to reduce a frictional force acting between the lower end portion of the valve body and the contact ground when dragging the underground structure lid.
[0010]
More specifically, the basic configuration of the above-described invention includes a lid body having a key hole formed in the outer peripheral portion, a valve lid, and a rotating portion extending downward from the valve lid. An upper end portion or a rear end portion of the valve lid rotatably attached to the back side of the lid body, and the valve lid swings up and down to open and close the keyhole. A lid for an underground structure for closing the opening of the underground structure, and a friction when the rotating part rotates in a state in which the rotating part is in contact with the ground at the lower end portion of the rotating part of the valve body Force reducing means is configured, and this frictional force reducing means acts between the rotating portion of the valve body and the contact ground when the valve lid swings in the direction to open the key hole. It can be expressed as a cover for an underground structure that is configured to reduce the frictional force. The frictional force reducing means is configured at the lower end portion of the rotating portion of the valve body, and the frictional force reducing means is more than the attachment position of the upper end portion of the rotating portion or the rear end portion of the valve lid to the back side of the lid body. Usually, it is provided on the keyhole side, and a sliding portion is often formed at the lower end portion of the rotation portion on the keyhole side than the frictional force reducing means. In order to simply configure the frictional force reducing means, the lower end surface of the rotating portion may be formed in an arcuate surface. The arcuate surface is curved in the turning direction of the turning part. More specifically, when the rotating part is rotated forward or backward from the lowest end, that is, when the rotating part is rotated in the opening direction, with the valve lid closing the key hole, at least forward. The lower end range is formed as an arcuate surface.
[0011]
In the present invention, an effective frictional force reducing means is configured by attaching a rotating roller to the rotating portion. The rotating roller is attached so that it protrudes below the lower surface of the rotating part. More specifically, the rotating roller is attached so that the lowermost end of the roller is in contact with the road surface or the like when the valve lid closes the keyhole. In addition, the protruding amount of the roller is usually designed so that the roller continues to contact the road surface or the like while the rotating portion rotates until the insertion of the club pin becomes possible. Preferably, it is configured such that when the rotating portion is rotated until the club can be inserted, the lower surface of the rotating portion in front of the rotating roller comes into contact with the road surface or the like. This technique is included in the following invention.
(1) It is comprised from the cover main body by which the keyhole was formed in the outer peripheral part, the valve cover, and the rotation part extended below from this valve cover, The upper end part of this rotation part or the rear-end part of the said valve cover is A valve body rotatably attached to the back side of the lid body, and the valve lid swings up and down to open and close the keyhole, for closing the opening of the underground structure It is a cover for an underground structure, and a frictional force reducing means for rotating the rotating part in a state where the rotating part is in contact with the ground is formed at a lower end portion of the rotating part of the valve body. The force reducing means is constituted by a rotating roller attached to the rotating part so as to protrude below the lower surface of the rotating part, and the rotating roller starts from the state where the key hole is closed. For underground structures that are configured to remain in contact with the ground until they are open for insertion .
(2) The rotating roller is configured such that the lower surface of the rotating portion in front of the rotating roller comes into contact with the ground when the key hole is opened so that the club can be inserted. The lid for an underground structure according to (1).
By the way, it is possible to constitute the frictional force reducing means by a single rotating roller. However, if a single rotating roller is used, the lid body tends to tilt, and the right or left of the rotating roller is in contact with the road surface or the like. There is a possibility that a sufficient frictional force reduction effect cannot be obtained by becoming an edge. Therefore, in order to rotate the rotating part in a more stable state, it is preferable to provide at least rotating rollers on both sides of the rotating part.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS.
[0013]
FIG. 1 is a cross-sectional view showing a state where a cover for an underground structure according to the present invention is attached to a manhole structure.
[0014]
The lid body 3 of the manhole cover 1 (underground structure lid) is formed in a thin disk shape in which reinforcing ribs 5 are integrally formed on the back surface side, and the upper end is rotatably attached to the outer peripheral portion on the back surface side. A hinge 7 configured to be able to swing is inserted into an insertion hole 13 of a hinge receiver 11 provided on an inner peripheral surface of a lid receiving frame 9 (manhole structure) and is fitted into an opening of the lid receiving frame 9. It is. The hinge 7 has support pins 15 on both sides of the upper end portion, and the support pins 15 are rotatably supported and attached to a bracket 17 formed integrally with the back surface of the lid body 3. A notch-shaped key hole 19 is formed on the outer peripheral portion of the lid body 3 on the side opposite to the hinge 7, and a valve body 21 that closes the key hole 19 from below is swung on the back side of the lid body 3. It is attached as possible. The valve body 21 includes a valve lid 23 that opens and closes the keyhole 19 and a rotating portion 25 that extends downward from the valve lid 23, and support pins 27 are formed on both sides of the upper end portion of the rotating portion 25. The support pin 27 is rotatably supported by a bracket 29 formed integrally with the back surface of the lid body 3. As shown in detail in FIG. 2, the valve lid 23 includes a valve seat 31 that integrally extends horizontally from the upper end of the rotating portion 25, a rubber packing 33 placed on the upper surface of the valve seat 31, The packing 33 is mounted on the upper surface of the packing 33. The valve seat 31 and the packing holding 35 are usually fastened by bolts (not shown) penetrating the packing 33 to fix the packing 33. They are sandwiched (FIG. 2 is a perspective view of the valve body 21). The packing retainer 35 is formed to have a slightly smaller plane than the keyhole 19, the packing 33 is formed to have a slightly larger plane than the keyhole 19, and the valve retainer 35 has the packing retainer 35 to the keyhole 19. The keyhole 19 is closed by being fitted inside and the packing 33 coming into contact with the periphery of the lower surface side of the keyhole 19, but the packing 33 does not necessarily seal the keyhole 19 in a sealing manner, and the gas vent passage is not provided. It is often configured in a shape that is formed. In FIG. 1, reference numeral 37 denotes a hook-like protrusion formed at an intermediate portion of the hinge 7 to prevent the lid body 3 from being lifted by engaging with the hinge receiver 11, and 39 denotes a retainer formed at the lower end portion of the hinge 7. The lid body 3 can be lifted until the retaining protrusion 39 comes into contact with the hinge receiver 11.
[0015]
As shown in detail in FIG. 2, the rotating portion 25 is formed to have a relatively narrow width, and has a hook-like protrusion 43 that engages with a locking portion 41 provided on the lid receiving frame 9 integrally at the tip. However, weights 45 that extend greatly outward are integrally formed on both sides of the rear end portion (only one weight 45 is shown). The weight 45 is formed so as to be positioned behind the support pin 27 even when the valve lid 23 closes the key hole 19. In other words, the weight 45 is located behind the center of swinging of the valve body 21 or the valve lid 23. Therefore, the valve lid 23 is always urged forward by the weight 45 so as to close the key hole 19. A large indentation 47 is formed in the front portion of the rotating portion 25 with respect to the weight 45 and the front portion is lightly configured, so that the urging effect by the weight 45 is enhanced, but the valve lid 23 is Rotating to press the keyhole 19 more strongly or to prevent the urging force of the weight 45 from being weakened on an inclined ground or preventing the valve lid 23 from opening easily due to the urging force acting in the opposite direction. An urging means (double torsion spring in this embodiment) 49 such as a spring is disposed between the rear surface of the portion 25 (the rear end surface of the weight 45) and the back surface of the lid body 3. One end of the continuous side of the double torsion spring 49 is hooked on a locking screw screwed on the rear surface between the pair of weights 45 and is fixed by being sandwiched by the head 51 of the locking screw. The other end portion is sandwiched and positioned between a pair of spring pressing pieces 53 formed integrally on the back surface of the lid body 3, and the coil portion is formed on the rear surface above the weight 45 of the valve body 21. It is contained in the curved recess 55. In a state in which the valve lid 23 closes the keyhole 19, the lower surface 57 of the rotating portion 25 has a middle portion 59 that is horizontal, a front portion 61 that gently rises forward, and a rear portion 63 ( The lower surface between the pair of weights 45 is formed to rise somewhat abruptly toward the rear side.
[0016]
A pair of left and right protruding shafts 65 extending outward are integrally formed below the central portion of the rotating portion 25, and the protruding shafts 65 are respectively lower than the intermediate portion 59 of the lower surface 57 of the rotating portion 25. A rotating roller 67 is rotatably attached so as to protrude to the side.
[0017]
In order to open the manhole cover 1 and open the opening of the cover receiving frame 9, the tip end of the stick 69 is inserted into the key hole 19 and the valve cover 23 is pushed down to place the tip of the stick 69 around the back side of the key hole 19. (Refer to FIG. 3: FIG. 3 is a cross-sectional view showing a state in which the valve lid 23 is opened), and each of the two bag-shaped prying holes 71 (see FIG. 4) formed in the outer peripheral portion of the lid body 3. The tip of a club (not shown) is inserted and hooked to pull up the entire lid body 3 from the lid receiving frame 9. The twisting hole 71 is used for twisting the lid body 3 when the manhole lid 1 has not been opened for a long period of time and is in a state of being bitten into the lid receiving frame 9 due to rusting or the like and difficult to open. However, it may be used together with the keyhole 19 when the lid body 3 is lifted. Then, the lid body 3 is turned along the road surface around the hinge 7 inserted into the insertion hole 13 of the hinge receiver 11 (see FIG. 4: FIG. 4 is a plan view for explaining the case where the manhole cover 1 is opened). . When closing the manhole cover 1, the tip of the club 69 is inserted into the key hole 19 of the cover body 3. The tip of the club 69 is formed in a T-shape, and both hooks 72 at the tip extending sideways after the valve lid 23 is pushed down are hooked around the back side of the keyhole 19. 23 closes the keyhole 19 (in this case, the rotating roller 67 is in contact with the road surface), as shown in FIG. When it is pushed (FIG. 5 a), the rotation portion 25 is rotated in the direction of opening, that is, rearward due to the rotation of the rotation roller 67, and the valve lid 23 is swung downward to move the club 69. The keyhole 19 is opened so that can be inserted (FIG. 5b). Then, the rod 69 is rotated 90 degrees to hook both hook portions 72 formed laterally on the tip portion around the back side of the keyhole 19 (FIG. 5c: FIG. 5 shows the valve in contact with the road surface). Sectional drawing explaining the rocking | fluctuation state of the body 21). In this state, the front portion 61 of the lower surface 57 of the rotating portion 25 (more specifically, the latter half of the front portion 61) is in contact with the road surface. Although there is little risk of damaging the rotating roller 67, it is also possible to move the lid body 3 by lifting the lid body 3 slightly by hooking the tip of the key rod into the twisting hole 71 (see FIG. 4) as in the case of opening the lid. In order to stabilize the open state, the latter half of the front portion 61 is formed in a straight line (see also FIG. 2). When considering the stability in the left-right direction, the latter half of the front side portion 61 should be formed in a planar shape. In addition, in the lid for the underground structure for closing the opening of the underground structure, which has a key hole into which the club can be inserted, and a valve body that closes the key hole is swingably attached to the back surface side. As a swing restraining means for restraining the swinging of the valve body when the valve body swings at the lower end of the valve body and the key rod can be locked in the key hole. If a lid for an underground structure formed with a locking means or a friction means (more specifically, a linear part or a flat part in contact with a road surface or the like in parallel), it is not necessary to provide a frictional force reducing means. There are cases where it is good. When the underground structure lid is moved to open the underground structure and the lid is placed on the ground, such as a road surface, the valve body is restrained from swinging even if the club is removed from the keyhole. This is because the rod does not swing so as to close the keyhole, so that the club can be inserted into the keyhole as it is when the opening of the underground structure is closed. Roundness 74 (see FIGS. 6 and 1 for smooth turning) is provided at the left and right edges of the front portion 61 of the lower surface 57 (FIG. 6 shows the shape of the front portion 61 of the lower surface 57 of the rotating portion 25. For example, the front portion 61 of the lower surface 57 of the rotating portion 25 constitutes a sliding portion, but the roundness 74 is twice the size of the chamfering that is normally applied. It is preferable to set the degree. Further, in order to perform the turning smoothly, it is possible to configure the caster by attaching the rotating roller 67 so as to be rotatable about the vertical axis or the substantially vertical axis. The valve lid 23 may be pushed down by stepping on the outer edge of the upper surface of the valve lid 23 with a foot. Further, in order to effectively prevent the manhole cover 1 from being easily opened, a fitting groove is provided around the peripheral wall of the keyhole 19, and both hook portions 72 at the tip of the club 69 are inserted into the fitting groove. You may comprise so that the hook part 72 can be hooked on the lid | cover main body 3 only by making it fit.
[0018]
FIG. 7 is a cross-sectional view illustrating another embodiment of a valve body and a swinging state of the valve body in contact with a road surface as a reference form.
[0019]
Another configuration of the valve body 73 is obtained by changing the configuration of the lower side of the rotating portion of the valve body 21. As for the rotation part 75 of the valve body 73, the intermediate part 79 of the lower surface 77 is formed in the circular arc surface centering on the support pin 27. As shown in FIG. Therefore, even if the valve lid 23 closes the key hole 19 when the lid body 3 is placed on the road surface (in this case, the intermediate portion 79 is in contact with the road surface), as shown in FIG. When the upper surface of the valve lid 23 is pushed downward with the tip of the rod 69, the rotating portion 75 rotates smoothly in the direction of opening, that is, rearward, and the valve lid 23 swings downward. The keyhole 19 is opened so that it can be moved to insert the key rod 69 (FIG. 7b). The front part 81 of the lower surface 77 of the rotating part 75 has the same shape as the front part 61 of the lower surface 57 of the rotating part 25 and constitutes a sliding part.
[0020]
【The invention's effect】
As described above, by using the underground structure lid of the present invention, even if the lid is placed on the road surface or the like, the valve body can be easily swung to insert the club into the keyhole.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state where a cover for an underground structure according to the present invention is attached to a manhole structure.
FIG. 2 is a perspective view of a valve body.
FIG. 3 is a cross-sectional view showing a state in which a valve lid is opened.
FIG. 4 is a plan view for explaining a case where a manhole cover is opened.
FIG. 5 is a cross-sectional view illustrating a swinging state of the valve body in contact with a road surface.
FIG. 6 is a cross-sectional view for illustrating the shape of the front side portion of the lower surface of the rotating portion.
FIG. 7 is a cross-sectional view illustrating another embodiment of a valve body and a swinging state of the valve body in contact with a road surface as a reference form.
[Explanation of symbols]
1 Manhole cover (cover for underground structure)
9 Lid frame (manhole structure)
19 Key hole 21 Valve body 61 Front side part of sliding part lower surface (sliding part)
67 Rotating roller (Friction force reducing means)

Claims (3)

In a lid for an underground structure for closing an opening of an underground structure, which has a key hole and a valve body that closes the key hole is swingably attached to the back surface side.
The lower end of the valve body is provided with a frictional force reducing means for reducing the frictional force acting between the valve body and the contact ground when the valve body swings in the direction to open the keyhole. A lid for an underground structure, characterized in that the frictional force reducing means is a rotating roller.   The rotating roller as the frictional force reducing means is provided at a lower end portion of the valve body on the keyhole side with respect to a position where the valve body is attached to the lid for an underground structure. Cover for underground structures.   The sliding part which makes it easy to drag the lid | cover for underground structures is provided in the lower end part of the said valve body by the side of the said keyhole rather than the said rotation roller as the said frictional force reduction means. Item 2. An underground structure lid according to Item 2.

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