JP7429438B2 - Lid holder frame set for underground structures - Google Patents

Description

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

In places where underground structures such as sewerage, water supply, electric power, gas, communications, etc. are connected to the ground, a receiving frame defining an opening connected to the underground structure and a lid body covering the opening shall be installed. In some cases, a set of cover frames for underground structures is installed. In this specification, the state in which the lid main body of the lid body is supported by the receiving frame and the opening is closed (the state in which the lid main body is fitted into the receiving frame) is referred to as the closed lid state, and the state in which the lid main body is opened from the closed state is referred to as the closed state. It is sometimes called open lid. Furthermore, the underground structure lid holder frame set may be abbreviated as a lid holder frame set.

The lid receiving frame set includes a hinge structure that connects the lid body to the receiving frame so that it can be opened and closed, and a locking member that prevents illegal dumping and trespassing, and furthermore, prevents the lid from opening due to pressure inside the underground structure. A device equipped with the following is known (see, for example, Patent Document 1). Note that in this specification, the pressure within the underground structure may be referred to as internal pressure.

The locking member includes a valve lid that closes a notch-shaped keyhole (burl hole) formed on the outer periphery of the lid body, a shaft portion that rotatably supports the lid body, a locking pawl, and The lid has a biasing means such as a spring that biases the keyhole in a direction to close it. When the valve cover closes the keyhole (closed state), the locking pawl locks with the pawl receiving piece of the receiving frame, and opening of the lid is prevented. In addition, by pushing the valve cover that is blocking the keyhole with the tip of the opening/closing tool and pushing the valve cover down against the urging force of a spring, the keyhole is opened and the claw part does not engage with the claw receiver piece. The lid can be opened by rotating the lid.

In such a lid holder frame set, when internal pressure increases due to internal water flooding due to localized heavy rain, the lid floats to a predetermined height relative to the holder frame, and the locking claw and the claw holder piece are locked. This releases the internal pressure from the gap between the lid body and the receiving frame. However, if the internal pressure continues to rise, the locking pawl will break before the sewer pipe or the like is damaged, opening the lid and releasing the internal pressure. This prevents damage to the sewer pipes, etc., and also prevents problems such as the hinge structure being destroyed and the lid flying off, or the entire receiving frame having to be replaced due to breakage or deformation of the catch piece. is prevented.

In addition, a so-called sealed type lid receiver frame set with improved sealing performance has been adopted to prevent water from entering through the keyhole (see, for example, Patent Document 2).

In the lid receiving frame set described in Patent Document 2, a recess is formed in the inner peripheral surface of the receiving frame, and the valve lid of the locking member is provided with a sealing material that protrudes from the periphery of the lid main body. In the closed state, the sealing material is brought into contact with the upper inner wall surface of the recess to close the gap in the keyhole, thereby suppressing water intrusion through the keyhole. Hereinafter, the lid holder frame set described in Patent Document 2 may be referred to as a closed type.

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

Here, when using a lid body having the above-mentioned locking member, when rotating the locking member with the opening/closing tool so that the locking pawl does not lock on the pawl receiving piece, the tip of the valve lid, the sealing material, etc. It is necessary to suppress interference between the upper surface of the claw holder and the upper surface of the claw holder. For this reason, in a closed-type lid holder frame set, the thickness of the claw holder is limited in order to prevent interference with the sealing material protruding from the periphery of the lid body, and the breaking strength of the claw holder tends to be weak. As a result, when the internal pressure increases and the lid floats up, there is a risk that the pawl receiving piece may be damaged or deformed before the locking pawl breaks. In addition, the internal pressure caused by recent torrential rains is tremendous, and even if the locking pawl breaks, it is desired to minimize the amount of things that fly or fall.

In view of the above-mentioned circumstances, the present invention is devised to reduce the size of broken pieces of the locking pawl, and also prevents breakage and deformation of the pawl receiving piece even in a closed type in which the pawl receiving piece cannot be thickened. The purpose of the present invention is to provide a lid holder frame set for underground structures that can be used.

A first lid receiving frame set for an underground structure 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 is supported by the receiving frame and closes the opening. In the lid holder frame set for underground structures,
The receiving frame has a claw receiving piece that projects diagonally downward at a position below the inner peripheral surface,
The lid body includes a lid body supported on the inner peripheral surface and having a keyhole formed in the outer peripheral part, and a lock member supported by a shaft on the back side of the lid body,
The locking member includes a valve lid, a locking claw provided at a position lower than the valve lid, and a biasing means, and the valve lid closes the keyhole around the shaft portion, and The locking pawl is rotatable between a closed state in which the locking pawl is located below the pawl receiving piece, and an open state in which the valve cover opens the keyhole and the locking pawl retreats from below the pawl receiving piece. When floating in the closed state, the locking pawl locks on the pawl receiving piece and prevents the opening from opening, while in the open state, the opening is allowed to open, and the biasing means prevents the opening from being opened. It is biased in the direction toward the state,
The length of the locking pawl in the width direction that corresponds to the axial direction of the shaft portion is 0.8 to 1.3 times the length of the keyhole in the width direction,
The claw receiver piece is provided on the lower side of the claw receiver piece at intervals in the width direction, and opposing surfaces thereof are reinforced by a pair of ribs along a direction perpendicular to the width direction,
The pair of ribs is characterized in that the distance is 1.1 to 1.4 times the widthwise length of the locking claw.

According to the first lid holder frame set for underground structures of the present invention, the length in the width direction of the locking pawl is suppressed to 1.3 times or less the length in the width direction of the keyhole. Since the cross-sectional area is made small, not only the broken pieces of the locking pawl are small, but also the locking pawl is easily broken. In addition, since the length of the locking pawl in the width direction is set to be 0.8 times or more the length of the keyhole in the width direction, the breaking strength of the locking pawl becomes too weak and the required pressure release resistance is reduced. It is also possible to avoid problems such as not being able to secure lift pressure performance.

Furthermore, 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 pawl, the locking pawl on the pawl receiving piece locks and the force is reduced. The pair of ribs will be located near this portion. Thereby, the pawl receiving piece is efficiently reinforced and its breaking strength is improved. As a result, even in a closed type lid holder frame set in which the claw holder cannot be made thicker (its cross-sectional area cannot be increased), damage and deformation of the claw holder can be suppressed. In addition, since the distance between the pair of ribs is set to be at least 1.1 times the length in the width direction of the locking pawl, it is possible to avoid problems such as wobbling of the hinge structure or manufacturing errors of the cast receiving frame. It is also possible to avoid the problem that it becomes difficult to insert the locking pawl between the pair of ribs.

Moreover, in the lid holder frame set for underground structures 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 claw receiving piece can be further improved. Here, the thickness of the rib refers to the dimension of the shaft portion in the axial direction. Further, the sum of the thicknesses of the pair of ribs is more preferably 1.3 times or more the distance.

Furthermore, in the lid holder frame set for underground structures of the present invention, the lower surface of the claw holder piece is inclined diagonally downward in the protruding direction, and the vicinity of the base is arc-shaped;
The locking pawl may come into contact with the vicinity of the base when the lid floats up.

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

If the lower surface of the claw receiving piece is inclined obliquely downward in the protrusion direction and the vicinity of the base is arc-shaped, the breaking strength in the vicinity of the base is improved. If the locking pawl comes into contact with the vicinity of the base when the internal pressure increases and the lid floats up, the moment applied to the base will also be reduced, preventing damage or deformation of the pawl receiving piece. It can be suppressed further.

A second lid receiving frame set for an underground structure 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 is supported by the receiving frame and closes the opening. In the lid holder frame set for underground structures,
The receiving frame has a claw receiving piece that projects diagonally downward at a position below the inner peripheral surface,
The lid body includes a lid body supported by the inner peripheral surface of the receiving frame and having a keyhole formed in the outer peripheral portion, and a lock member supported by a shaft portion on the back side of the lid body,
The locking member includes a valve lid, a locking claw provided at a position lower than the valve lid, and a biasing means, and the valve lid closes the keyhole around the shaft portion, and The locking pawl is rotatable between a closed state in which the locking pawl is located below the pawl receiving piece, and an open state in which the valve cover opens the keyhole and the locking pawl retreats from below the pawl receiving piece. When floating in the closed state, the locking pawl locks on the pawl receiving piece and prevents the opening from opening, while in the open state, the opening is allowed to open, and the biasing means prevents the opening from being opened. It is biased in the direction toward the state,
The length of the locking pawl in the width direction that corresponds to the axial direction of the shaft portion is 0.8 to 1.3 times the length of the keyhole in the width direction,
The claw receiver piece is provided on the lower side of the claw receiver piece at intervals in the width direction, and opposing surfaces thereof are reinforced by a pair of ribs along a direction perpendicular to the width direction,
A circular arc portion having an R3 mm to R5 mm is provided at a connecting portion between the opposing surfaces of each of the pair of ribs and the lower surface of the claw receiving piece.

According to the second lid holder frame set for underground structures of the present invention, the length of the locking pawl in the width direction is suppressed to 0.8 to 1.3 times the length of the keyhole in the width direction. Since the cross-sectional area of the locking pawl is made small, not only the broken pieces of the locking pawl are small, but also the locking pawl is easily broken. Furthermore, the arcuate portion connected to the claw receiver improves the breaking strength of the claw receiver. As a result, even if the claw receiver is of a closed type in which the thickness of the claw receiver cannot be increased, breakage and deformation of the claw receiver can be suppressed.

Further, an aspect may be adopted in which the thickness of the rear wall is 0.5 times or more the depth dimension of the bag portion. Also by doing so, the breaking strength of the claw receiver piece can be improved.

A third lid receiving frame set for an underground structure according to 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 is supported by the receiving frame and closes the opening. In the lid holder frame set for underground structures,
The receiving frame has a recess formed on the inner peripheral surface and a claw receiving piece protruding diagonally downward at a position below the recess,
The lid body includes a lid body supported by the inner peripheral surface of the receiving frame and having a keyhole formed in the outer peripheral portion, and a lock member supported by a shaft portion on the back side of the lid body,
The locking member includes a valve lid having a sealing material protruding from the periphery of the lid main body, a locking pawl provided at a position lower than the valve lid, and a biasing means, and At the center, there is a closed state in which the sealing material is brought into contact with the upper inner wall surface of the recess so that the valve cover closes the keyhole and the locking pawl is located below the pawl receiving piece; When the keyhole is opened, the locking pawl is rotatable to an open state where it retreats from below the pawl receiver, and when it floats in the closed state, the locking pawl is locked to the pawl receiver. While preventing the opening from opening, the opening is allowed to open in the open state, and is biased by the biasing means in a direction toward the closed state;
The length of the locking pawl in the width direction that corresponds to the axial direction of the shaft portion is 0.8 to 1.3 times the length of the keyhole in the width direction,
The claw receiver piece is provided on the lower side of the claw receiver piece at intervals in the width direction, and opposing surfaces thereof are reinforced by a pair of ribs along a direction perpendicular to the width direction,
The claw receiving piece has a lower surface protruding from the outside of the recess,
The locking pawl is characterized in that when the lid floats up, the locking pawl comes into contact with the lower surface of the pawl receiving piece on the outside of the recess.

That is, in the third lid receiving frame set for underground structures of the present invention, a recess is formed in the inner peripheral surface of the receiving frame, and the sealing material of the valve lid comes into contact with the upper inner wall surface of the recess to close the keyhole. This assumes a closed structure that closes off the air.

According to the third lid holder frame set for underground structures of the present invention, the length of the locking pawl in the width direction is suppressed to 0.8 to 1.3 times the length of the keyhole in the width direction. Since the cross-sectional area of the locking pawl is made small, not only the broken pieces of the locking pawl are small, but also the locking pawl is easily broken. Furthermore, when the lid floats up, the locking pawl comes into contact with the lower surface of the pawl receiving piece on the outside of the recess, so that the force of the locking pawl is applied to the receiving frame on the outside of the recess. The shearing force applied to the claw piece is reduced. As a result, even if the claw receiver is of a closed type in which the thickness of the claw receiver cannot be increased, breakage and deformation of the claw receiver can be suppressed.

Further, the recess and the upper surface of the pawl receiving piece may be continuous in an arc shape in cross-sectional view, following the trajectory of the tip of the sealing material when the locking member rotates. This aspect also makes it possible to improve the breaking strength of the claw receiving piece.

According to the present invention, the broken pieces of the locking pawl are devised to be reduced in size, and even if the pawl receiving piece is a closed type in which the pawl receiving piece cannot be thickened, breakage and deformation of the pawl receiving piece can be suppressed. A lid holder frame set for a structure can be provided.

(a) is a plan view of a lid holder frame set which is an embodiment of the first lid holder frame set for underground structures of the present invention, and (b) is a sectional view taken along line AA in (a). . (a) is a diagram showing the locking member shown in FIG. 1 extracted, and (b) is a diagram of the locking member in (a) seen from the left side of the diagram. (a) is a view of (b) seen from the outside (upper side in the figure), and (b) is a view showing the receiving frame of part B surrounded by a broken-line ellipse in FIG. 1(a). (c) is a view of (b) seen from the inside (lower side in the figure), and (d) is a cross-sectional view taken along the line DD of (b). (a) is an enlarged view of part C surrounded by a broken line circle in FIG. 1(b), and (b) is an enlarged view of the valve cover shown in FIG. 6 is a diagram showing a state in which the valve cover is pushed down against an urging force. (a) is a diagram showing how the lid floats due to internal pressure in the lid holder frame set shown in FIG. FIG. It is a figure which shows the lid holder frame set of 2nd Embodiment which is one Embodiment of the 2nd lid holder frame set for underground structures of this invention. It is a figure which shows the lid holder frame set of 3rd Embodiment which is one Embodiment of the 3rd lid holder frame set for underground structures of this invention. It is a figure which shows the lid holder frame set of a modification.

Embodiments of the present invention will be described below with reference to the drawings.

First, the first lid holder frame set for underground structures of the present invention will be described using a first embodiment. Although the first lid holder frame set for underground structures of the present invention is not limited to a closed type, the first embodiment is a sealed type in which the first lid holder frame set for underground structures of the present invention has a large effect. This will be explained using a type as an example.

FIG. 1(a) is a plan view of a lid holder frame set (a lid holder frame set for underground structures) which is an embodiment of the first lid holder frame set for underground structures of the present invention, and FIG. , is a sectional view taken along line AA in FIG. In addition, although the ground G is shown in FIG.1(b), in order to simplify a drawing, the ground G may be omitted as shown in FIG.1(a).

FIG. 1 shows a lid holder frame set 10 that includes a lid 3 having a disc-shaped lid main body 4 and a cylindrical receiving frame 2 that supports the lid 3. A sewer drain pipe, which is an underground structure, is buried at a predetermined depth from the ground surface, and a manhole is provided as an underground facility in the middle of the sewer drain pipe. Both sewerage drain pipes and manholes are equivalent to underground structures. A manhole is a vertical hole that extends from a sewerage pipe to the surface of the earth, and is made of a pile of ready-made concrete moldings. The receiving frame 2 is provided on its frame, and has an inner circumferential surface 21 defining an opening connected to a manhole, which is an underground structure.

As shown in FIG. 1(b), the lid body 3 includes a lock member 5 and a hinge member 6 in addition to the lid body 4. The lid body 4 is supported by the inner circumferential surface 21 of the receiving frame 2 and closes the opening in a freely openable and closable manner.The lid body 3 shown in FIG. 1 closes the opening when the lid body 4 fits into the receiving frame 2. (lid closed). The lid body 4 is made of cast iron, and is provided with reinforcing lid ribs 42 on its lower surface. Note that the lid body 4 may be made of iron other than cast iron, metal other than iron, resin, or concrete. Further, a cutout-shaped keyhole 41 for inserting an opening/closing tool is provided in the outer peripheral portion of the lid body 4.

As shown in FIG. 1(b), the hinge member 6 is rotatably connected to the peripheral edge of the lower surface of the lid main body 4 on the side opposite to the keyhole 41 by a shaft 63. The hinge member 6 includes a hook-shaped projection 61 formed at its middle portion and a retaining projection 62 formed at its lower end portion. Further, a hinge seat 22 is provided below the inner circumferential surface 21 of the receiving frame 2. The hinge seat 22 is provided with a through hole 221 through which the hinge member 6 passes in the vertical direction, and an engaged portion 222. The hinge member 6 and the hinge seat 22 constitute a hinge structure, and the lid body 4 can be rotated 360 degrees or 180 degrees. Note that the retaining protrusion 62 is a part that comes into contact with the hinge seat 22 when the lid body 3 is lifted, and when the lid body 3 is lifted until the retaining protrusion 62 comes into contact with the hinge seat 22, the lid body 4 cannot be reversed vertically. can.

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

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

As shown in FIGS. 2(a) and 2(b), the locking member 5 includes a pair of shaft portions 51, 51 supported on the back side of the lid body 4, a valve lid 52 that closes the keyhole 41, and a valve lid 52 that closes the keyhole 41. It has a locking pawl 53 provided below the lid 52, a weight 54, and a spring (double torsion spring) 55 as a biasing means. The valve lid 52 includes a valve seat 521, a sealing material (packing) 522 disposed on the valve seat 521, and a presser plate 523 disposed on the sealing material 522. Specifically, the sealing material 522 and the holding plate 523 are fixed to the valve seat 521 with a fixing member consisting of a bolt and a nut. As described above, this embodiment employs the closed type lid holder frame set 10, and the tip of the sealing material 522 protrudes from the periphery of the lid body 4 (see FIG. 4(a), etc.).

The length W2 of the locking pawl 53 in the width direction, which corresponds to the axial direction of the shaft portion 51, is set to be 0.8 to 1.3 times the length W1 of the keyhole 41 in the width direction. As shown in FIG. 2(b), the locking claw 53 has side surfaces 531 parallel to each other, and has a uniform width throughout. In addition, in FIG. 2(b), the length W2 of the locking pawl 53 in the width direction is 1.25 times the length W1 of the keyhole 41 in the width direction (for example, W2 is 30 mm and W1 is 24 mm). Shows what has been set.

The lock member 5 is rotatable about the pair of shaft parts 51, 51 between a closed state in which the valve cover 52 closes the keyhole 41 and an open state in which the valve cover 52 opens the keyhole 41. Further, a force is applied by the weight 54 in the direction toward the closed state, and a spring 55 is biased in the direction toward the closed state.

FIG. 3(b) is a diagram showing the receiving frame of part B surrounded by a broken-line ellipse in FIG. 1(a). Figure 3(a) is a view of Figure 3(b) viewed from the outside (upper side in the figure), and Figure 3(c) is a view of Figure 3(b) viewed from the inside (lower side in the figure). It is. Further, FIG. 3(d) is a sectional view taken along the line DD in FIG. 3(b). Note that in FIGS. 3(a) to 3(c), the left-right direction is the axial direction of the shaft portion 51 of the locking member 5 (see FIG. 2(b)).

As shown in FIGS. 3(c) and 3(d), there is an outwardly recessed portion on the inner circumferential surface of the receiving frame 2 at a location facing the keyhole 41 (see FIG. 1(a)) of the lid body 4. 211 is formed, and a claw receiving piece 23 that projects diagonally downward is provided below the recess 211. The upper surface 231 of the pawl receiving piece 23 is continuous with the recess 211, and as shown in FIG. An inner wall surface 211a is formed.

The pawl receiving pieces 23 are arranged vertically at intervals S in the width direction that coincides with the axial direction of the shaft portion 51 on the lower side of the pawl receiving pieces 23, and the facing surfaces 241 facing each other are arranged in a direction perpendicular 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. 3(b), the opposing surfaces 241, 241 of the pair of ribs 24, 24, and the inner surface 251 of the rear wall 25 form a substantially U-shaped bag portion in plan view. The locking pawl 53 of the locking member 5 is inserted into the space R surrounded by. Further, in this embodiment, a first arcuate portion 26 with an R3 mm to R5 mm is provided at the connection portion between the opposing 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 this first arc portion 26.

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

As shown in FIG. 3(c), the distance S between the pair of ribs 24, 24 is 1.1 to 1 of the length W2 in the width direction of the locking pawl 53 of the locking member 5 (see FIG. 2(b)). .It is set to 4 times. In FIG. 3, the distance S between the pair of ribs 24, 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). It shows. In addition, in order to contrast the distance S between the pair of ribs 24, 24 and the length W2 in the width direction of the locking claw 53, the locking claw 53 is conceptually indicated by a two-dot chain line in FIG. 3(c). There is.

Further, as shown in FIG. 3(c), in the present embodiment, the sum of the thickness T1, which is the dimension in the axial direction of the shaft portion 51, of the pair of ribs 24, 24 is 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, 24 is 1.35 times the distance S between the pair of ribs 24, 24 (for example, when S is 40 mm, T1 (27 mm) + T1 (27 mm) = 54 mm).

FIG. 4(a) is an enlarged view of a portion C surrounded by a broken line circle in FIG. 1(b).

FIG. 4(a) shows the state of the blockage. Specifically, as shown by the arc-shaped arrow, a force is applied by the weight 54 in the direction toward the closed state, and a force is applied by the spring 55 in the direction toward the closed state. This embodiment is of a closed type, and the upper surface of the tip portion of the sealing material 522 is in pressure contact with the upper inner wall surface 211a of the recess 211, and the valve cover 52 closes the keyhole 41. Therefore, no gap is created between the sealing material 522 and the receiving frame 2, and the sealing performance is improved. Further, in the closed state shown in FIG. 4(a), the locking claw 53 is located below the claw receiving piece 23. That is, the locking pawl 53 is inserted into the space R surrounded by the bag portion, and when the lid body 3 floats, the locking pawl 53 locks on the pawl receiving piece 23 to prevent the opening from opening ( (See Figure 5).

FIG. 4(b) is a diagram showing a state in which the valve lid shown in FIG. 4(a) is pushed down with the tip of the opening/closing tool against the biasing force of a spring or the like.

FIG. 4(b) shows the open state. Specifically, as shown by the arc-shaped arrow, the locking member 5 rotates counterclockwise in the figure, the keyhole 41 is opened, and the locking pawl 53 retreats from below the pawl receiving piece 23, and the locking member 5 rotates counterclockwise in the figure. It is located outside the space R surrounded by the area. As described above, the tip of the sealing material 522 protrudes from the periphery of the lid body 4. Therefore, when the locking member 5 rotates from the closed state to the open state, the thickness of the claw receiving piece 23 is limited in order to prevent 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. 4(b), when the tip of the opening/closing tool To is engaged with the edge of the keyhole 41 and the opening/closing tool is pulled up, the locking pawl 53 opens without being locked on the pawl receiving piece 23. It can be covered. That is, in the open state, opening of the opening is allowed.

FIG. 5A is a diagram showing how the lid floats due to internal pressure in the lid holder frame set shown in FIG. 1B.

When the internal pressure increases above a predetermined level due to torrential rain or the like, the lid 3 floats up as shown in FIG. 5(a). Specifically, with the hook-shaped protrusion 61 of the hinge member 6 engaging with the engaged portion 222 of the hinge seat 22 and the locking claw 53 being locked with the claw receiving piece 23, the lid main body 4 is raised. Float for a minute. This releases internal pressure from the gap between the lid body 4 and the receiving frame 2.

FIG. 5(b) is an enlarged view of portion E surrounded by a broken circle in FIG. 5(a).

As shown in FIG. 5(b), the locking pawl 53 is locked to the pawl receiving piece 23 in a state in which the locking pawl 53 is in contact with the lower surface 232 of the pawl receiving piece 23. Note that when the lid body 3 floats, the lock member 5 moves counterclockwise after the locking pawl 53 comes into contact with the lower surface 232 of the pawl receiving piece 23 closer to the base 232a than in the state shown in the figure. It rotates slightly, and the position where the locking claw 53 makes contact moves toward the tip side.

As the internal pressure further increases, the locking pawl 53 breaks, and the locking between the locking pawl 53 and the pawl receiving piece 23 is released. As a result, the lid is opened and the internal pressure is released, thereby preventing damage to the sewer pipe and the like, as well as preventing problems such as the hinge structure being destroyed and the lid body 3 flying off. In this embodiment, the side surfaces 531 of the locking pawl 53 are configured to be parallel and have a uniform width as a whole, so that the strength accuracy of the locking pawl 53 is stable, and the pawl receiving piece 23 is prevented from being damaged or deformed. can be further suppressed.

As explained using FIG. 2(b), the length W2 of the locking pawl 53 in the width direction is set to be 1.3 times or less the length W1 of the keyhole 41 in the width direction. Therefore, the locking pawl 53 can be easily broken, and the size of the broken piece can be reduced.

On the other hand, if the widthwise length W2 of the locking pawl 53 is less than 0.8 times the widthwise length W1 of the keyhole 41, the breaking strength of the locking pawl 53 will become too weak. As a result, it is undesirable that the locking pawl may break when the internal pressure is within the range of 60 kN to 106 kN, making it difficult to ensure the necessary pressure release resistance performance.

Further, as explained using FIG. 3(c) etc., the locking claw 53 is formed by a pair of ribs 24 provided at an interval S of 1.4 times or less the length W2 of the locking claw 53 in the width direction. , 24. As a result, the pair of ribs 24, 24 are located near the portion of the lower surface 232 of the pawl receiving piece 23 where the locking pawl 53 locks and applies force. As a result, the claw receiver piece 23 is effectively reinforced and its breaking strength is improved, and it is possible to prevent the claw receiver piece 23 from being damaged or deformed before the locking claw 53 is broken. . That is, it is possible to avoid the problem of having to replace the entire receiving frame 2.

On the other hand, if the distance S between the pair of ribs 24, 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 the cast product may This is not preferable since there is a possibility that a certain manufacturing error of the receiving frame 2 or the like may hinder the insertion of the locking pawl 53 into the space R surrounded by the bag portion.

Furthermore, in this embodiment, the pair of ribs 24, 24 are configured such that the sum of the thicknesses T1, which is the dimension in the axial direction of the shaft portion 51, is larger than the interval S between the pair of ribs 24, 24. ing. By doing so, the breaking strength of the claw receiving piece 23 can be further improved. Here, in order to improve the breaking strength of the claw receiver piece 23, the sum of the thicknesses T1 of the pair of ribs 24, 24 is more preferably 1.3 times or more the distance S between the pair of ribs 24, 24. , the breaking strength of the claw receiving piece 23 will not improve any further.

Further, as shown in the locking claw 53' indicated by a dashed line in FIG. You may adopt the aspect which abuts near the base part 232a. As explained using FIG. 3(d), in the claw receiving piece 23 of this embodiment, the lower surface 232 is inclined diagonally downward in the protrusion direction, and the vicinity of the base 232a is arc-shaped. Therefore, the breaking strength near the base 232a is improved. Furthermore, by adopting a mode in which the claws come into contact near the base portion 232a, the moment applied to the base portion 232a is also reduced, and damage and deformation of the claw receiving piece 23 can be further suppressed. Here, the vicinity of the base 232a refers to a 30% area of the lower surface 232 of the claw receiving piece 23 from the base 232a to the tip, closer to the base 232a.

Next, other embodiments and modifications of the lid holder frame set shown in FIGS. 1 to 5 will be described. In other embodiments and modified examples described below, differences from the embodiment shown in FIGS. 1 to 5 will be mainly explained, and the same names as the names of components in the embodiment shown in FIGS. 1 to 5 will be explained. Components will be explained using the same reference numerals, and redundant explanations may be omitted.

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

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

In this embodiment, the breaking strength of the claw receiver 23 is improved by the second circular arc portion 27 connected to the claw receiver 23, and damage and deformation of the claw receiver 23 can be suppressed even if the claw receiver 23 is of a closed type. . Therefore, in the present embodiment, the distance S between the pair of ribs 24 is 1.1 to 1.2 times the width W2 of the locking claw 53 (see FIG. 2(b)) in the first embodiment. The requirement is not limited to four times. Therefore, since the second circular arc portion 27 is provided, the distance S between the pair of ribs 24 may be relatively increased compared to the first embodiment. For example, the distance S between the pair of ribs 24 may be set to 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 holder frame set of a third embodiment, which is an embodiment of the third lid holder frame set for underground structures of the present invention. The third lid holder frame set of the present invention is 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 with a dashed line.

In FIG. 7, a vertical line hanging down 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. The locking claw 53 is configured to come into contact with the lower surface 232 of the claw receiving piece 23 on the outside of the recess 211 when the lid 3 floats (see FIG. 5(b)). Note that the protruding dimension of the pawl receiving piece 23' may be shortened as shown by the dashed line in order to make the locking pawl 53 come into contact with the outside of the recess 211.

According to this embodiment, when the lid 3 floats, the locking claw 53 comes into contact with the lower surface 232 of the claw receiving piece 23 on the outside of the recess 211, so that the force of the locking claw 53 is applied to the recess. The shearing force applied to the portion of the receiving frame 2 on the outside of the receiving frame 211 and the claw receiving piece 23 is reduced. Therefore, even in the case of a closed type in which the claw receiving piece 23 cannot be made thicker, breakage and deformation of the claw receiving piece 23 can be suppressed.

FIG. 8 is a diagram showing a lid holder 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. 8(a), the orbit Or of the sealing material 522 when the locking member 5 rotates is shown by a broken line, and the recess 211 and the upper surface 231 of the pawl receiving piece 23 form a circle in cross-section following the orbit Or. Continuous in an arc. Thereby, even if the sealing type is used, it is possible to improve the breaking strength of the pawl receiving piece 23 while avoiding interference between the sealing material 522 and the pawl receiving piece 23.

Moreover, as shown in FIG. 8(a), in this modification, the thickness of the rear wall 25 is made thicker, and the distance between the locking pawl 53 and the inner surface 251 of the rear wall 25 in the closed state is reduced. Specifically, as shown in FIG. 8(b), the thickness T2 of the rear wall 25 is equal to the thickness of the bag portion formed by the opposing surfaces 241, 241 of the pair of ribs 24, 24 and the inner surface 251 of the rear wall 25. The depth dimension De is set to 0.5 to 0.8 times. With this configuration as well, the breaking strength of the claw receiving piece 23 can be improved.

Further, in FIG. 8(c), as shown in an enlarged view of the continuous portion of the concave portion 211 and the upper surface 231 of the claw receiving piece 23, the concave portion 211 is expanded outwardly as it goes upward at an angle α (for example, 3~ 5°) may be tilted. Even in this embodiment, the breaking strength of the pawl receiving piece 23 can be improved while avoiding interference between the sealing material 522 and the pawl receiving piece 23.

According to the lid holder frame set 10 described above, the broken pieces of the locking pawl 53 are devised to be small, and even if the pawl holder piece 23 is of a closed type in which the thickness of the pawl holder piece 23 cannot be increased, the pawl holder piece 23 may be damaged. and deformation can be suppressed.

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

Note that even if the constituent features are included only in the descriptions of each embodiment and each modification described above, the constituent features may be applied to other embodiments and other modifications.

10 Lid holder frame set (lid holder frame set for underground structures)
2 Receiving frame 21 Inner peripheral surface 211 Recess 211a Upper inner wall surface 23 Claw receiver piece 231 Upper surface 232 Lower surface 232a Base 24 Rib 241 Opposing surface 25 Rear wall 251 Inner surface 27 Second arc portion 3 Lid body 4 Lid body 41 Keyhole 5 Lock member 51 Shaft 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, the set includes a receiving frame that defines an opening connected to the underground structure, and a lid that is supported by the receiving frame and closes the opening,
The receiving frame has a claw receiving piece that projects diagonally downward at a position below the inner peripheral surface,
The lid body includes a lid body supported on the inner peripheral surface and having a keyhole formed in the outer peripheral part, and a lock member supported by a shaft on the back side of the lid body,
The locking member includes a valve lid, a locking claw provided at a position lower than the valve lid, and a biasing means, and the valve lid closes the keyhole around the shaft portion, and The locking pawl is rotatable between a closed state in which the locking pawl is located below the pawl receiving piece, and an open state in which the valve cover opens the keyhole and the locking pawl retreats from below the pawl receiving piece. When floating in the closed state, the locking pawl locks on the pawl receiving piece and prevents the opening from opening, while in the open state, the opening is allowed to open, and the biasing means prevents the opening from being opened. It is biased in the direction toward the state,
The length of the locking pawl in the width direction that corresponds to the axial direction of the shaft portion is 0.8 to 1.3 times the length of the keyhole in the width direction,
The claw receiver piece is provided on the lower side of the claw receiver piece at intervals in the width direction, and opposing surfaces thereof are reinforced by a pair of ribs along a direction perpendicular to the width direction,
A lid holder frame set for an underground structure, wherein the distance between the pair of ribs is 1.1 to 1.4 times the widthwise length of the locking pawl. 2. The lid holder frame set for underground structures according to claim 1, wherein the pair of ribs has a sum of thicknesses greater than the interval. The lower surface of the claw receiving piece is inclined diagonally downward in the protruding direction, and the vicinity of the base is arcuate,
3. The lid holder frame set for an underground structure according to claim 1, wherein the locking pawl comes into contact with the vicinity of the base when the lid floats up. In a lid receiving frame set for an underground structure, the set includes a receiving frame that defines an opening connected to the underground structure, and a lid that is supported by the receiving frame and closes the opening,
The receiving frame has a claw receiving piece that projects diagonally downward at a position below the inner peripheral surface,
The lid body includes a lid body supported by the inner peripheral surface of the receiving frame and having a keyhole formed in the outer peripheral portion, and a lock member supported by a shaft portion on the back side of the lid body,
The locking member includes a valve lid, a locking claw provided at a position lower than the valve lid, and a biasing means, and the valve lid closes the keyhole around the shaft portion, and The locking pawl is rotatable between a closed state in which the locking pawl is located below the pawl receiving piece, and an open state in which the valve cover opens the keyhole and the locking pawl retreats from below the pawl receiving piece. When floating in the closed state, the locking pawl locks on the pawl receiving piece and prevents the opening from opening, while in the open state, the opening is allowed to open, and the biasing means prevents the opening from being opened. It is biased in the direction toward the state,
The length of the locking pawl in the width direction that corresponds to the axial direction of the shaft portion is 0.8 to 1.3 times the length of the keyhole in the width direction,
The claw receiver piece is provided on the lower side of the claw receiver piece at intervals in the width direction, and opposing surfaces thereof are reinforced by a pair of ribs along a direction perpendicular to the width direction,
A lid holder frame set for an underground structure, characterized in that an arcuate portion with a radius of 3 mm to 5 mm is provided at a connection portion between the opposing surfaces of each of the pair of ribs and the lower surface of the claw holder piece. In a lid receiving frame set for an underground structure, the set includes a receiving frame that defines an opening connected to the underground structure, and a lid that is supported by the receiving frame and closes the opening,
The receiving frame has a recess formed on the inner peripheral surface and a claw receiving piece protruding diagonally downward at a position below the recess,
The lid body includes a lid body supported by the inner peripheral surface of the receiving frame and having a keyhole formed in the outer peripheral portion, and a lock member supported by a shaft portion on the back side of the lid body,
The locking member includes a valve lid having a sealing material protruding from the periphery of the lid main body, a locking pawl provided at a position lower than the valve lid, and a biasing means, and At the center, there is a closed state in which the sealing material is brought into contact with the upper inner wall surface of the recess so that the valve cover closes the keyhole and the locking pawl is located below the pawl receiving piece; When the keyhole is opened, the locking pawl is rotatable to an open state where it retreats from below the pawl receiver, and when it floats in the closed state, the locking pawl is locked to the pawl receiver. While preventing the opening from opening, the opening is allowed to open in the open state, and is biased by the biasing means in a direction toward the closed state;
The length of the locking pawl in the width direction that corresponds to the axial direction of the shaft portion is 0.8 to 1.3 times the length of the keyhole in the width direction,
The claw receiver piece is provided on the lower side of the claw receiver piece at intervals in the width direction, and opposing surfaces thereof are reinforced by a pair of ribs along a direction perpendicular to the width direction,
The claw receiving piece has a lower surface protruding from the outside of the recess,
The lid holder frame set for an underground structure, wherein the locking pawl comes into contact with a lower surface of the pawl receiving piece on the outside of the recess when the lid floats up.

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