JP2022007059A - Lid reception frame set for underground structure - Google Patents

Abstract

To provide a lid reception fame set for an underground structure, which is contrived to reduce broken pieces of a locking claw and can suppress destruction or deformation of a claw reception piece even in a sealed type prohibited from making the claw reception piece thicker.SOLUTION: A lid reception frame set 10 for an underground structure comprises: a reception frame 2 that defines an opening connected to the underground structure; and a lid body 3 that is supported by the reception frame 2 to close the opening. The reception frame 2 has a claw reception piece 23 which obliquely protrudes downward. The lid body 3 has a lid main body 4, and a lock member 5 supported by a shaft 51. A locking claw 53 has a length W2 in the width direction 0.8-1.3 times as long as that of a key hole 41 in the width direction. The claw reception piece 23 is reinforced by a pair of ribs 24, 24 provided with a space from each other below the claw reception piece 23 in the width direction. The ribs 24, 24 have a space S that is 1.1-1.4 times as long as the length W2 of the locking claw 53 in the width direction.SELECTED DRAWING: Figure 3

Description

The present invention relates to a lid receiving frame set for an underground structure including a receiving frame that defines an opening connected to the underground structure and a lid that closes the opening by being supported by the receiving frame.

In places where underground structures such as underground buried objects and underground facilities in sewerage, water supply, electric power, gas, communication, etc. are connected to the ground, a receiving frame that defines an opening connected to the underground structure and a lid that closes the opening are provided. A set of lid receiving frames for underground structures may be installed. In the present specification, the state in which the lid body of the lid is supported by the receiving frame and the opening is closed (the state in which the lid body is fitted in the receiving frame) is referred to as a closed state, and the lid body is opened from the closed state. Sometimes referred to as an open lid. Further, the lid receiving frame set for an underground structure may be abbreviated as a lid receiving frame set.

The lid receiving frame set has a hinge structure that connects the lid body to the receiving frame so that it can be opened and closed, and a lock member to prevent illegal dumping and illegal intrusion, and to prevent opening of the lid due to pressure inside the underground structure. Is known (see, for example, Patent Document 1 and the like). In the present specification, the pressure inside the underground structure may be referred to as an internal pressure.

The lock member includes a valve lid that closes a notch-shaped keyhole (bar hole) formed in the outer peripheral portion of the lid body, a shaft portion that rotatably supports the lid body, a locking claw, and a valve. The lid has an urging means such as a spring that urges the keyhole in the closing direction. In the state where the valve lid closes the keyhole (closed state), the locking claw is locked to the claw receiving piece of the receiving frame to prevent the lid from being opened. In addition, the keyhole is opened by pushing the valve lid that closes the keyhole with the tip of the opening / closing tool and pushing down the valve lid against the urging force of the spring or the like, and the claw portion does not engage with the claw piece. The lid can be opened by rotating to the state.

In such a lid receiving frame set, when inland water overflows due to torrential rain or the like and the internal pressure increases, the lid body rises to a predetermined height with respect to the receiving frame, and the locking claw and the claw receiving piece are locked. The internal pressure is released from the gap between the lid body and the receiving frame. Even so, if the internal pressure increases, the locking claw breaks before the sewer pipe or the like is damaged, and the lid is opened by this to release the internal pressure. This prevents damage to the sewer pipe, etc., destroys the hinge structure and causes the lid to scatter, and damage or deformation of the claw receiving piece of the receiving frame causes the entire receiving frame to be replaced. Is being prevented.

Further, a so-called closed type lid receiving frame set having improved airtightness with respect to water entering from the keyhole is also adopted (see, for example, Patent Document 2 and the like).

The lid receiving frame set described in Patent Document 2 is provided with a sealing material in which a recess is formed on the inner peripheral surface of the receiving frame and the valve lid of the lock member protrudes from the peripheral edge of the lid main body. Then, in the closed state, the sealing material is brought into contact with the upper inner wall surface of the recess to close the gap of the keyhole, whereby water invading from the keyhole can be suppressed. Hereinafter, the lid receiving frame set described in Patent Document 2 may be referred to as a closed type.

Japanese Unexamined Patent Publication No. 10-219721 Japanese Unexamined Patent Publication No. 2002-138505.

Here, when the lid body having the above-mentioned lock member is used, when the lock member is rotated so that the locking claw is not locked to the claw receiving piece by the opening / closing tool, the tip of the valve lid, the sealing material, or the like is used. It is necessary to suppress the interference between the nail piece and the upper surface of the nail piece. Therefore, in the closed type lid receiving frame set, the thickness of the nail receiving piece is limited in order to suppress the interference with the sealing material protruding from the peripheral edge of the lid main body, and the breaking strength of the nail receiving piece tends to be weakened. As a result, when the internal pressure increases and the lid floats, there is a possibility that the claw receiving piece may be damaged or deformed before the locking claw breaks. In addition, the internal pressure caused by the recent guerrilla rainstorms is tremendous, and even if the locking claws break, it is desired to make the things that scatter or fall as small as possible.

In view of the above circumstances, the present invention has been devised to reduce the size of broken pieces of the locking claw, and even if the claw receiving piece cannot be thickened, it is possible to suppress damage or deformation of the claw receiving piece. It is an object of the present invention to provide a lid receiving frame set for an underground structure that can be used.

The first underground structure lid receiving frame set of the present invention that solves the above object includes a receiving frame that defines an opening connected to the underground structure, and a lid that closes the opening by being supported by the receiving frame. In the lid receiving frame set for underground structures
The receiving frame has a claw receiving piece that protrudes diagonally downward at a position below the inner peripheral surface.
The lid body has a lid body supported by the inner peripheral surface and having a keyhole formed in an outer peripheral portion thereof, and a lock member supported by a shaft portion on the back side of the lid body.
The lock member has a valve lid, a locking claw provided at a position below the valve lid, and a urging means, and the valve lid closes the keyhole around the shaft portion. The locking claw can be rotated into a closed state in which the locking claw is located below the claw receiving piece, and an open state in which the valve lid opens the keyhole and the locking claw retracts from below the claw receiving piece. When ascended in the closed state, the locking claw locks on the claw receiving piece to prevent the opening from opening, while the opening is allowed to open in the opened state, and the closing is performed by the urging means. It was urged toward the state,
The locking claw has a length in the width direction corresponding to the axis direction of the shaft portion of 0.8 to 1.3 times the length in the width direction of the keyhole.
The nail receiving piece is provided below the nail receiving piece at intervals in the width direction, and the facing surfaces facing each other are reinforced by a pair of ribs along the direction orthogonal to the width direction.
The pair of ribs is characterized in that the distance is 1.1 to 1.4 times the length in the width direction of the locking claw.

According to the first set of lid receiving frames for underground structures of the present invention, the length of the locking claw in the width direction is suppressed to 1.3 times or less the length in the width direction of the keyhole of the locking claw. Since the cross-sectional area is small, the broken pieces of the locking claw are small, and the locking claw is easily broken. Further, since the length in the width direction of the locking claw is set to 0.8 times or more the length in the width direction of the keyhole, the breaking strength of the locking claw becomes too weak and the required pressure release resistance is obtained. It is also possible to avoid problems such as the inability to secure the lifting performance.

Further, since the distance between the pair of ribs is set to 1.4 times or less the length in the width direction of the locking claw, the locking claw in the claw receiving piece is locked and the force is applied. The pair of ribs will be located near such a portion. As a result, the nail piece is efficiently reinforced and the breaking strength is improved. As a result, even in a closed type lid receiving frame set in which the claw receiving piece cannot be thickened (the cross-sectional area cannot be increased), damage or deformation of the claw receiving piece can be suppressed. Further, since the distance between the pair of ribs is set to 1.1 times or more the length in the width direction of the locking claw, the hinge structure may be loose or a casting frame may be manufactured due to a manufacturing error. It is also possible to avoid problems such as difficulty in inserting the locking claws between the pair of ribs.

Further, in the lid receiving frame set for an underground structure of the present invention, the sum of the thicknesses of the pair of ribs may be larger than the interval.

By doing so, the breaking strength of the nail receiving piece can be further improved. Here, the thickness of the rib means the dimension of the shaft portion in the axial core direction. Further, the sum of the thicknesses of the pair of ribs is more preferably 1.3 times or more the interval.

Further, in the lid receiving frame set for an underground structure of the present invention, the lower surface of the claw receiving piece is inclined diagonally downward in the projecting direction, and the vicinity of the base is arcuate.
The locking claw may come into contact with the vicinity of the base when the lid floats.

That is, the lower surface of the nail receiving piece is inclined diagonally downward from the base portion toward the tip end. Further, it may have a rear wall connecting the pair of ribs on the outer peripheral side, and an arc portion may be provided at a connecting portion between the inner surface of the rear wall and the lower surface of the claw receiving piece.

If the lower surface of the nail receiving piece is inclined diagonally downward in the projecting direction and the vicinity of the base is arcuate, the breaking strength in the vicinity of the base is improved. Then, when the internal pressure increases and the lid floats, if the locking claw abuts in the vicinity of the base, the moment applied to the base also becomes small, and the claw receiving piece is damaged or deformed. It can be suppressed more.

The second underground structure lid receiving frame set of the present invention that solves the above object includes a receiving frame that defines an opening connected to the underground structure, and a lid that closes the opening by being supported by the receiving frame. In the lid receiving frame set for underground structures
The receiving frame has a claw receiving piece that protrudes diagonally downward at a position below the inner peripheral surface.
The lid body has a lid body supported by the inner peripheral surface of the receiving frame and having a keyhole formed in an outer peripheral portion thereof, and a lock member supported by a shaft portion on the back side of the lid body.
The lock member has a valve lid, a locking claw provided at a position below the valve lid, and a urging means, and the valve lid closes the keyhole around the shaft portion. The locking claw can be rotated into a closed state in which the locking claw is located below the claw receiving piece, and an open state in which the valve lid opens the keyhole and the locking claw retracts from below the claw receiving piece. When ascended in the closed state, the locking claw locks on the claw receiving piece to prevent the opening from opening, while the opening is allowed to open in the opened state, and the closing is performed by the urging means. It was urged toward the state,
The locking claw has a length in the width direction corresponding to the axis direction of the shaft portion of 0.8 to 1.3 times the length in the width direction of the keyhole.
The nail receiving piece is provided below the nail receiving piece at intervals in the width direction, and the facing surfaces facing each other are reinforced by a pair of ribs along the direction orthogonal to the width direction.
It is characterized in that an arc portion having an R3 mm to R5 mm is provided at a connecting portion between the facing surface of each of the pair of ribs and the lower surface of the claw receiving piece.

According to the second set of lid receiving frames for underground structures of the present invention, the length in the width direction of the locking claw is suppressed to 0.8 to 1.3 times the length in the width direction of the keyhole. Since the cross-sectional area of the stop claw is small, the broken pieces of the locking claw are small and the locking claw is easily broken. Further, the arc portion connected to the nail receiving piece improves the breaking strength of the nail receiving piece. As a result, even if the nail piece is a closed type that cannot be thickened, damage or deformation of the nail piece can be suppressed.

Further, an embodiment in which the thickness of the rear wall is 0.5 times or more the depth dimension of the bag portion may be adopted. By doing so, the breaking strength of the nail receiving piece can also be improved.

The third underground structure lid receiving frame set of the present invention that solves the above object includes a receiving frame that defines an opening connected to the underground structure, and a lid that closes the opening by being supported by the receiving frame. In the lid receiving frame set for underground structures
The receiving frame has a recess formed on the inner peripheral surface and a claw receiving piece projecting diagonally downward at a position below the recess.
The lid body has a lid body supported by the inner peripheral surface of the receiving frame and having a keyhole formed in an outer peripheral portion thereof, and a lock member supported by a shaft portion on the back side of the lid body.
The lock member has a valve lid provided with a sealing material protruding from the peripheral edge of the lid body, a locking claw provided at a position below the valve lid, and a urging means, and the shaft portion is provided. In the center, the sealing material is brought into contact with the upper inner wall surface of the recess, the valve lid closes the key hole, and the locking claw is located below the claw receiver, and the valve lid is in a closed state. The locking claw can be rotated to an open state in which the key hole is opened and the locking claw retracts from below the claw receiving piece, and when the locking claw floats in the closed state, the locking claw is locked to the claw receiving piece. While preventing the opening of the opening, the opening is allowed to be opened in the open state, and the opening is urged by the urging means in the direction toward the closed state.
The locking claw has a length in the width direction corresponding to the axis direction of the shaft portion of 0.8 to 1.3 times the length in the width direction of the keyhole.
The nail receiving piece is provided below the nail receiving piece at intervals in the width direction, and the facing surfaces facing each other are reinforced by a pair of ribs along the direction orthogonal to the width direction.
The lower surface of the nail receiver protrudes from the outside of the recess, and the lower surface thereof protrudes from the outside.
The locking claw is characterized in that when the lid body floats, it comes into contact with the lower surface of the claw receiving piece to the outside of the recess.

That is, in the third underground structure lid receiving frame set of the present invention, a recess is formed on the inner peripheral surface of the receiving frame, and the sealing material of the valve lid abuts on the upper inner wall surface of the recess and the keyhole. It is premised on a closed structure that closes the door.

According to the third set of lid receiving frames for underground structures of the present invention, the length in the width direction of the locking claw is suppressed to 0.8 to 1.3 times the length in the width direction of the keyhole. Since the cross-sectional area of the stop claw is small, the broken pieces of the locking claw are small and the locking claw is easily broken. Further, since the locking claw abuts on the lower surface of the claw receiving piece on the outer side of the concave portion when the lid body floats, the force of the locking claw is applied to the receiving frame on the outer side of the concave portion. The shearing force applied to the portion and the nail piece is reduced. As a result, even if the nail piece is a closed type that cannot be thickened, damage or deformation of the nail piece can be suppressed.

Further, the recess and the upper surface of the claw receiving piece may be continuous in a cross-sectional arc shape following the trajectory of the tip of the sealing material when the lock member rotates. Also in this aspect, the breaking strength of the nail receiving piece can be improved.

According to the present invention, a device is made to reduce the broken pieces of the locking claw, and even if the claw piece is a closed type that cannot be thickened, the claw piece can be suppressed from being damaged or deformed underground. A lid receiving frame set for a structure can be provided.

(A) is a plan view of the lid receiving frame set which is one embodiment of the lid receiving frame set for the 1st underground structure of this invention, and (b) is the sectional view taken along line AA of (a). .. (A) is a view showing the lock member shown in FIG. 1 extracted, and (b) is a view showing the lock member of (a) from the left side of the figure. (A) is a view of (b) viewed from the outside (upper side in the figure), and (b) is a view showing a receiving frame of a portion B surrounded by a broken line ellipse in FIG. 1 (a). (C) is a view of (b) viewed from the inside (lower side in the figure), and (d) is a sectional view taken along line DD of (b). (A) is an enlarged view showing the part C surrounded by the broken line circle in FIG. 1 (b), and FIG. It is a figure which shows the state which pushed down the valve lid against the urging force. (A) is a diagram showing a state in which the lid body is levitated by internal pressure in the lid receiving frame set shown in FIG. 1 (b), and (b) is an enlargement of the portion E surrounded by the broken line circle in (a). It is a figure which shows. It is a figure which shows the lid receiving frame set of the 2nd Embodiment which is one embodiment of the lid receiving frame set for the 2nd underground structure of this invention. It is a figure which shows the lid receiving frame set of the 3rd Embodiment which is one embodiment of the lid receiving frame set for the 3rd underground structure of this invention. It is a figure which shows the lid receiving frame set of a modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, the first underground structure lid receiving frame set of the present invention will be described with reference to the first embodiment. The first underground structure lid receiving frame set of the present invention is not limited to the closed type, but in the first embodiment, the effect of the first underground structure lid receiving frame set of the present invention is large. The type will be described as an example.

1 (a) is a plan view of a lid receiving frame set (a lid receiving frame set for an underground structure) which is an embodiment of the first underground structure lid receiving frame set of the present invention, and FIG. 1 (b) is a plan view. , A is a cross-sectional view taken along the line AA of the figure (a). Although the ground G is shown in FIG. 1 (b), the ground G may be omitted as shown in the figure (a) in order to simplify the drawing.

FIG. 1 shows a lid receiving frame set 10 including a lid 3 having a disk-shaped lid main body 4 and a tubular receiving frame 2 supporting the lid 3. The sewerage drainage pipe, which is an underground buried object, is buried at a predetermined depth from the ground surface, and a manhole is provided as an underground facility in the middle of the sewerage drainage pipe. Both sewer drains and manholes correspond to underground structures. A manhole is formed as a vertical hole from a sewer drainage pipe to the ground surface by a skeleton made by stacking ready-made concrete molded products. The receiving frame 2 is provided on the frame thereof, and an opening connected to a manhole, which is an underground structure, is defined by an inner peripheral surface 21.

As shown in FIG. 1 (b), the lid body 3 has a lock member 5 and a hinge member 6 in addition to the lid main body 4. The lid body 4 is supported by the inner peripheral surface 21 of the receiving frame 2 to open and close the opening, and the lid body 3 shown in FIG. 1 closes the opening by fitting the lid body 4 to the receiving frame 2. (Closed). The lid main body 4 is made of cast iron, and a lid rib 42 for reinforcement is provided on the lower surface thereof. The lid body 4 may be made of iron other than cast iron, or may be made of metal, resin, or concrete other than iron. Further, a notch-shaped keyhole 41 for inserting an opening / closing tool is provided on the outer peripheral portion of the lid main body 4.

As shown in FIG. 1 (b), the hinge member 6 is rotatably connected to the peripheral edge portion of the lower surface of the lid main body 4 opposite to the keyhole 41 by a shaft 63. The hinge member 6 includes an uncinate process 61 formed in an intermediate portion thereof and a retaining projection 62 formed in a lower end portion thereof. Further, a hinge seat 22 is provided at a position below the inner peripheral surface 21 of the receiving frame 2. The hinge seat 22 is provided with a through hole 221 through which the hinge member 6 penetrates in the vertical direction and an engaged portion 222. The hinge structure is formed by the hinge member 6 and the hinge seat 22, and the lid body 4 can be turned 360 degrees or turned 180 degrees. The retaining protrusion 62 is a portion that abuts on the hinge seat 22 when the lid 3 is lifted, and when the lid 3 is lifted until the retaining protrusion 62 abuts on the hinge seat 22, the lid body 4 can be vertically inverted. can.

A lock member 5 is supported by a shaft portion 51 on the back side of a portion of the lid body 4 where the keyhole 41 is formed. Further, in the portion of the receiving frame 2 corresponding to the lock member 5, a claw receiving piece 23 protruding diagonally downward from the inner peripheral surface 21 is provided.

FIG. 2A is a diagram showing the lock member shown in FIG. 1 extracted. FIG. 2B is a view of the lock member of FIG. 2A as viewed from the left side of the figure. Note that FIG. 2B also shows a part of the lid main body 4 around the shaft portion 51, showing a state in which the lock member 5 is supported on the back side of the lid main body 4.

As shown in FIGS. 2A and 2B, the lock member 5 includes a pair of shaft portions 51, 51 supported on the back side of the lid main body 4, a valve lid 52 for closing the keyhole 41, and a valve. It has a locking claw 53 provided below the lid 52, a weight 54, and a spring (double torsion spring) 55 as a urging means. The valve lid 52 has a valve seat 521, a sealing material (packing) 522 arranged on the valve seat 521, and a holding plate 523 arranged on the sealing material 522. Specifically, the sealing material 522 and the pressing plate 523 are fixed to the valve seat 521 by a fixing member composed of bolts and nuts. As described above, in the present embodiment, the closed type lid receiving frame set 10 is adopted, and the tip of the sealing material 522 protrudes from the peripheral edge of the lid main body 4 (see FIG. 4A and the like).

In the locking claw 53, the length W2 in the width direction corresponding to the axis direction of the shaft portion 51 is set to 0.8 to 1.3 times the length W1 in the width direction of the keyhole 41. As shown in FIG. 2B, the locking claws 53 have side surfaces 531 configured in parallel and have a uniform width as a whole. In FIG. 2B, the length W2 in the width direction of the locking claw 53 is 1.25 times the length W1 in the width direction of the keyhole 41 (for example, W2 is 30 mm and W1 is 24 mm). Shows what has been set.

The lock member 5 is rotatable around a pair of shaft portions 51, 51 into a closed state in which the valve lid 52 closes the keyhole 41 and an open state in which the valve lid 52 opens the keyhole 41. Further, the weight 54 applies a force in the direction toward the closed state, and the spring 55 urges the force in the direction toward the closed state.

FIG. 3B is a diagram showing a receiving frame of a portion B surrounded by a broken line ellipse in FIG. 1A. FIG. 3 (a) is a view of the figure (b) viewed from the outside (upper side in the figure), and FIG. 3 (c) is a view of the figure (b) viewed from the inside (lower side in the figure). Is. Further, FIG. 3D is a sectional view taken along line DD of FIG. 3B. In FIGS. 3A to 3C, the left-right direction is the axis direction in the shaft portion 51 of the lock member 5 (see FIG. 2B).

As shown in FIGS. 3 (c) and 3 (d), a concave portion recessed outward in a portion of the inner peripheral surface of the receiving frame 2 facing the keyhole 41 (see FIG. 1 (a)) of the lid main body 4. The 211 is formed, and a claw receiving piece 23 projecting diagonally downward is provided at a position below the recess 211. The upper surface 231 of the claw receiving piece 23 is continuous with the recess 211, and as shown in FIG. 3 (d), the upper end of the recess 211 is contacted with the sealing material 522 (see FIG. 2) of the lock member 5. The inner wall surface 211a is formed.

The claw receiving piece 23 is erected on the lower side of the claw receiving piece 23 with an interval S in the width direction corresponding to the axis direction of the shaft portion 51, and the facing surfaces 241 facing each other are erected along the direction orthogonal to the width direction. It is reinforced by a pair of ribs 24, 24 and a rear wall 25 connecting the pair of ribs 24, 24 on the outer peripheral side. As shown in FIG. 3B, the facing surfaces 241,241 of each of the pair of ribs 24 and 24 and the inner surface 251 of the rear wall 25 form a bag portion having a substantially U-shape in a plan view, and the bag portion is formed. The locking claw 53 of the locking member 5 is inserted into the space R surrounded by. Further, in the present embodiment, a first arc portion 26 having a diameter of R3 mm to R5 mm is provided at a connecting portion between the facing surface 241 of the rib 24 and the inner surface 251 of the rear wall 25. The pair of ribs 24, 24 are reinforced by the first arc portion 26.

As shown in FIG. 3D, in the present application, the portion where the lower surface 232 of the nail receiving piece 23 connects to the inner surface 251 of the rear wall 25 is referred to as the base portion 232a of the lower surface 232 of the nail receiving piece 23. The lower surface 232 of the nail receiving piece 23 is inclined diagonally downward from the base portion 232a toward the tip end. That is, the highest portion of the lower surface 232 of the nail receiving piece 23 is the base portion 232a. The vicinity of the base portion 232a is formed in an arc shape in the cross-sectional view shown in FIG. 3 (d).

As shown in FIG. 3C, the distance S between the pair of ribs 24 and 24 is 1.1 to 1 of the length W2 in the width direction of the locking claw 53 of the locking member 5 (see FIG. 2B). . It is set to 4 times. In FIG. 3, the distance S between the pair of ribs 24 and 24 is set to about 1.33 times the length W2 in the width direction of the locking claw 53 (for example, W2 is 30 mm and S is 40 mm). Is shown. In order to compare the distance S between the pair of ribs 24 and 24 with the length W2 of the locking claw 53 in the width direction, the locking claw 53 is conceptually shown by a two-dot chain line in FIG. 3 (c). There is.

Further, as shown in FIG. 3C, in the present embodiment, the pair of ribs 24, 24 has a pair of ribs 24, 24 in which the sum of the thickness T1 which is the dimension in the axial direction of the shaft portion 51 is the sum of the pair of ribs 24, 24. It is configured to be larger than the interval S. In FIG. 3, the sum of the thicknesses T1 of the pair of ribs 24 and 24 is 1.35 times the interval S of the pair of ribs 24 and 24 (for example, T1 (27 mm) + T1 (27 mm) for S of 40 mm) = 54 mm) is shown.

FIG. 4A is an enlarged view showing a portion C surrounded by a broken line circle in FIG. 1B.

FIG. 4A shows the state of the blocked state. Specifically, as shown by the arcuate arrow, the weight 54 applies a force in the direction toward the closed state, and the spring 55 urges the force in the direction toward the closed state. This embodiment is a closed type, in which the upper surface of the tip portion of the sealing material 522 is pressed against the upper inner wall surface 211a of the recess 211, and the valve lid 52 closes the keyhole 41. Therefore, no gap is formed between the sealing material 522 and the receiving frame 2, and the airtightness is improved. Further, in the closed state shown in FIG. 4A, the locking claw 53 is located below the claw receiving piece 23. That is, the locking claw 53 is inserted into the space R surrounded by the bag portion, and when the lid 3 floats, the locking claw 53 is locked to the claw receiving piece 23 and the opening of the opening is prevented ( See FIG. 5).

FIG. 4B is a diagram showing a state in which the valve lid shown in FIG. 4A is pushed by the tip of the opening / closing tool and the valve lid is pushed down against the urging force of a spring or the like.

FIG. 4 (b) shows the state of the open state. Specifically, as shown by the arcuate arrow, the lock member 5 rotates counterclockwise in the figure, the keyhole 41 is opened, and the locking claw 53 retracts from below the claw receiving piece 23, so that the bag It is located outside the space R surrounded by the part. As described above, the tip of the sealing material 522 protrudes from the peripheral edge of the lid main body 4. Therefore, when the lock member 5 rotates from the closed state to the open state, the thickness of the claw receiving piece 23 is limited in order to suppress the interference between the tip of the sealing material 522 and the upper surface 231 of the locking claw 53. ..

In the open state shown in FIG. 4B, when the tip portion of the opening / closing tool To is engaged with the edge portion of the keyhole 41 and the opening / closing tool is pulled up, the locking claw 53 opens without being locked to the claw receiving piece 23. Can be covered. That is, in the open state, opening of the opening is allowed.

FIG. 5A is a diagram showing a state in which the lid body is levitated by the internal pressure in the lid receiving frame set shown in FIG. 1B.

When the internal pressure rises above a predetermined level due to torrential rain or the like, the lid 3 floats as shown in FIG. 5 (a). Specifically, the lid body 4 is raised with the hook-shaped protrusion 61 of the hinge member 6 engaged with the engaged portion 222 of the hinge seat 22 and the locking claw 53 locked with the claw receiving piece 23. It will surface for h minutes. As a result, the internal pressure is released from the gap between the lid main body 4 and the receiving frame 2.

FIG. 5 (b) is an enlarged view showing the portion E surrounded by the broken line circle in the figure (a).

As shown in FIG. 5B, the locking claw 53 is locked to the claw receiving piece 23 in a state where the locking claw 53 is in contact with the lower surface 232 of the claw receiving piece 23. When the lid 3 floats, the lock member 5 counterclockwise after the locking claw 53 abuts closer to the base 232a on the lower surface 232 of the claw receiving piece 23 than in the state shown in the figure. It rotates slightly around and the position where the locking claw 53 contacts is moved to the tip side.

When the internal pressure further increases, the locking claw 53 breaks and the locking claw 53 and the claw receiving piece 23 are released from the locking. As a result, the lid is opened and the internal pressure is released to prevent damage to the sewer pipe and the like, and it is possible to prevent problems such as the hinge structure being destroyed and the lid 3 being scattered. In the present embodiment, since the side surface 531 of the locking claw 53 is configured to be parallel and has a uniform width as a whole, the strength accuracy of the locking claw 53 is stable, and the claw receiving piece 23 is damaged or deformed. Can be further suppressed.

As described with reference to FIG. 2B, the length W2 in the width direction of the locking claw 53 is set to 1.3 times or less the length W1 in the width direction of the keyhole 41. Therefore, the locking claw 53 is easily broken, and the broken pieces can be reduced.

On the other hand, if the length W2 in the width direction of the locking claw 53 is less than 0.8 times the length W1 in the width direction of the keyhole 41, the breaking strength of the locking claw 53 becomes too weak. As a result, it may be difficult to secure the required pressure release withstand pressure resistance, for example, the locking claw breaks when the internal pressure is in the range of 60 kN to 106 kN, which is not preferable.

Further, as described with reference to FIG. 3C and the like, the locking claw 53 is a pair of ribs 24 provided with an interval S of 1.4 times or less the length W2 in the width direction of the locking claw 53. , 24 are reinforced. As a result, the pair of ribs 24, 24 are located on the lower surface 232 of the claw receiving piece 23 near the portion where the locking claw 53 is locked and the force is applied. As a result, the claw receiving piece 23 is effectively reinforced to improve the breaking strength, and it is possible to prevent the claw receiving piece 23 from being damaged or deformed before the locking claw 53 is broken. .. That is, it is possible to avoid a problem that the entire receiving frame 2 must be replaced.

On the other hand, if the distance S between the pair of ribs 24 and 24 is less than 1.1 times the length W2 in the width direction of the locking claw 53, the hinge member 6 and the hinge seat 22 may rattle or be cast. It is not preferable because there is a possibility that the insertion of the locking claw 53 into the space R surrounded by the bag portion may be hindered due to a manufacturing error of the receiving frame 2.

Further, in the present embodiment, the pair of ribs 24, 24 is configured such that the sum of the thickness T1 which is the dimension in the axial core direction of the shaft portion 51 is larger than the distance S between the pair of ribs 24, 24. ing. By doing so, the breaking strength of the nail receiving piece 23 can be further improved. Here, in order to improve the breaking strength of the nail receiving piece 23, the sum of the thicknesses T1 of the pair of ribs 24 and 24 is more preferably 1.3 times or more the interval S of the pair of ribs 24 and 24. If it exceeds 2 times, the breaking strength of the nail receiving piece 23 does not improve any more.

Further, as in the locking claw 53'shown by the alternate long and short dash line in FIG. 5B, the locking claw 53'is formed on the lower surface 232 of the claw receiving piece 23 by increasing the total length of the locking claw 53'. A mode of contacting the vicinity of the base portion 232a may be adopted. As described with reference to FIG. 3D, in the nail receiving piece 23 of the present embodiment, the lower surface 232 is inclined diagonally downward in the projecting direction, and the vicinity of the base 232a is arcuate. Therefore, the breaking strength in the vicinity of the base portion 232a is improved. Further, if the aspect of contacting the vicinity of the base portion 232a is adopted, the moment applied to the base portion 232a is also reduced, and the damage or deformation of the nail receiving piece 23 can be further suppressed. Here, the vicinity of the base portion 232a means a region of the lower surface 232 of the nail receiving piece 23 from the base portion 232a to the tip, which is 30% closer to the base portion 232a.

Next, other embodiments and modifications of the set of lid receiving frames shown in FIGS. 1 to 5 will be described. In the other embodiments and modifications described below, the differences from the embodiments shown in FIGS. 1 to 5 will be mainly described, and the same names as the names of the components in the embodiments shown in FIGS. 1 to 5 will be described. The components of the above will be described with reference numerals used so far, and duplicate description may be omitted.

FIG. 6 is a diagram showing a lid receiving frame set of a second embodiment, which is an embodiment of a lid receiving frame set for a second underground structure of the present invention. FIG. 6 shows a state corresponding to FIG. 3 (c) of the first embodiment.

As shown in FIG. 6, in the present embodiment, a second arc portion 27 having R3 mm to R5 mm is provided at a connection portion between the facing surface 241 of each of the pair of ribs 24 and 24 and the lower surface 232 of the claw receiving piece 23. There is.

In the present embodiment, the second arc portion 27 connected to the nail receiving piece 23 improves the breaking strength of the nail receiving piece 23, and even if it is a closed type, it is possible to suppress damage or deformation of the nail receiving piece 23. .. Therefore, in the present embodiment, the distance S between the pair of ribs 24 is 1.1 to 1. of the length W2 (see FIG. 2B) in the width direction of the locking claw 53 in the first embodiment. It is not limited to the requirement of quadruple. Therefore, the distance S between the pair of ribs 24 may be relatively large as compared with the first embodiment by providing the second arc portion 27. For example, the distance S between the pair of ribs 24 may be 1.3 to 1.7 times the length W2 of the locking claw 53 in the width direction.

FIG. 7 is a diagram showing a lid receiving frame set of a third embodiment, which is an embodiment of a lid receiving frame set for a third underground structure of the present invention. The third lid receiving frame set of the present invention is premised on a closed type having a recess 211. FIG. 7 shows a state corresponding to FIG. 3 (d) of the first embodiment. Further, regarding the locking device, only the tip portion of the locking claw 53 is schematically shown by a alternate long and short dash line.

In FIG. 7, a vertical straight line hanging from the recess 211 is shown by a two-dot chain line, and the lower surface 232 of the claw receiving piece 23 protrudes from the outside of the recess 211. When the lid 3 floats up (see FIG. 5B), the locking claw 53 adopts a configuration in which the lower surface 232 of the claw receiving piece 23 abuts on the outer side of the recess 211. As shown by the alternate long and short dash line, the protruding dimension of the claw receiving piece 23'may be shortened by the amount that the locking claw 53 is brought into contact with the outside of the recess 211.

According to the present embodiment, when the lid 3 floats, the locking claw 53 abuts on the outer side of the lower surface 232 of the claw receiving piece 23 than the recess 211, so that the force of the locking claw 53 is recessed. The shearing force applied to the claw receiving piece 23 on the receiving frame 2 portion outside the 211 is reduced. Therefore, even if the nail receiving piece 23 is a closed type that cannot be thickened, damage or deformation of the nail receiving piece 23 can be suppressed.

FIG. 8 is a diagram showing a cover receiving frame set of a modified example. FIG. 8 (a) shows a state corresponding to FIG. 4 (a) of the first embodiment, and FIG. 8 (b) shows a state corresponding to FIG. 6 of the second embodiment.

In FIG. 8A, the trajectory Or of the sealing material 522 when the lock member 5 rotates is shown by a broken line, and the recess 211 and the upper surface 231 of the claw receiving piece 23 are cross-sectional viewing circles following the trajectory Or. It is continuous in an arc. As a result, even in the closed type, the breaking strength of the claw receiving piece 23 can be improved while avoiding interference between the sealing material 522 and the claw receiving piece 23.

Further, as shown in FIG. 8A, in this modification, the thickness of the rear wall 25 is thickened, and the distance between the locking claw 53 and the inner surface 251 of the rear wall 25 in the closed state is reduced. Specifically, as shown in FIG. 8B, the thickness T2 of the rear wall 25 is a bag portion composed of the facing surfaces 241,241 of the pair of ribs 24 and 24 and the inner surface 251 of the rear wall 25. It is set to 0.5 to 0.8 times the depth dimension De of. With this configuration as well, the breaking strength of the nail receiving piece 23 can be improved.

Further, in FIG. 8 (c), as shown by enlarging the portion where the concave portion 211 and the upper surface 231 of the nail receiving piece 23 are continuous, the angle α (for example, 3 to 3 to 3) in the direction in which the concave portion 211 expands outward as it goes upward. 5 °) It may be tilted. Also in this embodiment, the breaking strength of the nail receiving piece 23 can be improved while avoiding interference between the sealing material 522 and the nail receiving piece 23.

According to the lid receiving frame set 10 described above, a device is made to reduce the broken pieces of the locking claw 53, and even if the claw receiving piece 23 is a closed type that cannot be thickened, the claw receiving piece 23 is damaged. And deformation can be suppressed.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims.

It should be noted that even if the constituent requirements are included only in the description of each embodiment and each modified example described above, the constituent requirements may be applied to other embodiments or other modified examples.

10 Cover receiving frame set (cover receiving frame set for underground structures)
2 Receiving frame 21 Inner peripheral surface 211 Recessed portion 211a Upper inner wall surface 23 Claw receiving piece 231 Upper surface 232 Lower surface 232a Base 24 Rib 241 Facing surface 25 Rear wall 251 Inner surface 27 Second arc portion 3 Lid body 4 Lid body 41 Keyhole 5 Lock member 51 Axis Part 52 Valve lid 522 Sealing material (packing)
53,53'Locking claw 55 spring (double torsion spring)
6 Hinge member

Claims (5)

In a lid receiving frame set for an underground structure, which includes a receiving frame that defines an opening connected to the underground structure and a lid that closes the opening by being supported by the receiving frame.
The receiving frame has a claw receiving piece that protrudes diagonally downward at a position below the inner peripheral surface.
The lid body has a lid body supported by the inner peripheral surface and having a keyhole formed in an outer peripheral portion thereof, and a lock member supported by a shaft portion on the back side of the lid body.
The lock member has a valve lid, a locking claw provided at a position below the valve lid, and a urging means, and the valve lid closes the keyhole around the shaft portion. The locking claw can be rotated into a closed state in which the locking claw is located below the claw receiving piece, and an open state in which the valve lid opens the keyhole and the locking claw retracts from below the claw receiving piece. When ascended in the closed state, the locking claw locks on the claw receiving piece to prevent the opening from opening, while the opening is allowed to open in the opened state, and the closing is performed by the urging means. It was urged toward the state,
The locking claw has a length in the width direction corresponding to the axis direction of the shaft portion of 0.8 to 1.3 times the length in the width direction of the keyhole.
The nail receiving piece is provided below the nail receiving piece at intervals in the width direction, and the facing surfaces facing each other are reinforced by a pair of ribs along the direction orthogonal to the width direction.
The pair of ribs is a lid receiving frame set for an underground structure, characterized in that the distance is 1.1 to 1.4 times the length in the width direction of the locking claw. The lid receiving frame set for an underground structure according to claim 1, wherein the pair of ribs has a sum of thicknesses larger than the interval. The lower surface of the nail receiving piece is inclined diagonally downward in the projecting direction, and the vicinity of the base is arcuate.
The lid receiving frame set for an underground structure according to claim 1 or 2, wherein the locking claw abuts in the vicinity of the base when the lid floats. In a lid receiving frame set for an underground structure, which includes a receiving frame that defines an opening connected to the underground structure and a lid that closes the opening by being supported by the receiving frame.
The receiving frame has a claw receiving piece that protrudes diagonally downward at a position below the inner peripheral surface.
The lid body has a lid body supported by the inner peripheral surface of the receiving frame and having a keyhole formed in an outer peripheral portion thereof, and a lock member supported by a shaft portion on the back side of the lid body.
The lock member has a valve lid, a locking claw provided at a position below the valve lid, and a urging means, and the valve lid closes the keyhole around the shaft portion. The locking claw can be rotated into a closed state in which the locking claw is located below the claw receiving piece, and an open state in which the valve lid opens the keyhole and the locking claw retracts from below the claw receiving piece. When ascended in the closed state, the locking claw locks on the claw receiving piece to prevent the opening from opening, while the opening is allowed to open in the opened state, and the closing is performed by the urging means. It was urged toward the state,
The locking claw has a length in the width direction corresponding to the axis direction of the shaft portion of 0.8 to 1.3 times the length in the width direction of the keyhole.
The nail receiving piece is provided below the nail receiving piece at intervals in the width direction, and the facing surfaces facing each other are reinforced by a pair of ribs along the direction orthogonal to the width direction.
A lid receiving frame set for an underground structure, characterized in that an arc portion of R3 mm to R5 mm is provided at a connecting portion between the facing surface of each of the pair of ribs and the lower surface of the claw receiving piece. In a lid receiving frame set for an underground structure, which includes a receiving frame that defines an opening connected to the underground structure and a lid that closes the opening by being supported by the receiving frame.
The receiving frame has a recess formed on the inner peripheral surface and a claw receiving piece projecting diagonally downward at a position below the recess.
The lid body has a lid body supported by the inner peripheral surface of the receiving frame and having a keyhole formed in an outer peripheral portion thereof, and a lock member supported by a shaft portion on the back side of the lid body.
The lock member has a valve lid provided with a sealing material protruding from the peripheral edge of the lid body, a locking claw provided at a position below the valve lid, and a urging means, and the shaft portion is provided. In the center, the sealing material is brought into contact with the upper inner wall surface of the recess, the valve lid closes the key hole, and the locking claw is located below the claw receiver, and the valve lid is in a closed state. The locking claw can be rotated to an open state in which the key hole is opened and the locking claw retracts from below the claw receiving piece, and when the locking claw floats in the closed state, the locking claw is locked to the claw receiving piece. While preventing the opening of the opening, the opening is allowed to be opened in the open state, and the opening is urged by the urging means in the direction toward the closed state.
The locking claw has a length in the width direction corresponding to the axis direction of the shaft portion of 0.8 to 1.3 times the length in the width direction of the keyhole.
The nail receiving piece is provided below the nail receiving piece at intervals in the width direction, and the facing surfaces facing each other are reinforced by a pair of ribs along the direction orthogonal to the width direction.
The lower surface of the nail receiver protrudes from the outside of the recess, and the lower surface thereof protrudes from the outside.
The locking claw is a lid receiving frame set for an underground structure, characterized in that when the lid body floats, it abuts on the lower surface of the claw receiving piece to the outside of the recess.

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