JP6964892B2 - Cover receiving frame set for underground structures - Google Patents

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.

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 this closed state. May be 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 locking structure that prevents illegal dumping and illegal intrusion, and also prevents opening of the lid due to pressure inside the underground structure. Those equipped with are known. In this specification, the pressure inside the underground structure may be referred to as an internal pressure. This locking structure is generally composed of a locking member provided on the lid body and a claw receiving portion provided on the receiving frame (see, for example, Patent Documents 1 to 3 and the like). The lock member has a lock body, a shaft portion that swingably supports the lock body with respect to the lid body, and a claw portion provided integrally with the lock body, and the claw portion serves as a claw receiving portion of the receiving frame. The lid opening is prevented when the engaged state is reached. Further, the lid can be opened by inserting a T-shaped or hook-shaped opening / closing tool through the keyway formed in the lid body and swinging the lock member so that the claw portion does not engage with the claw receiving portion. .. The lid receiving frame set described in Patent Document 1 is provided with a valve body for closing the key hole in the lock member. The lid receiving frame set described in Patent Document 2 has a regulating member swingably provided on the lid body in addition to the locking member, and the regulating member is provided with a valve body. In this lid receiving frame set, when the valve body is pressed by the opening / closing tool to swing the regulating member, the locking member is pushed by the swinging regulating member and swings. Further, the lid receiving frame set described in Patent Document 3 includes a regulating member having a valve body and a locking member, and the regulating member and the locking member swing independently by an opening / closing tool inserted from a keyway. be.

Further, in these lid receiving frame sets, 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 claw portion and the claw receiving portion engage with each other. In this state, the internal pressure is released from the gap between the lid body and the receiving frame. Even so, if the internal pressure increases, the shaft portion of the lock member breaks and the lock member separates from the lid body before the sewer pipe or the like is damaged, thereby opening the lid and releasing the internal pressure. By doing so, damage to the sewer pipe, etc. is prevented, the hinge structure is destroyed and the lid is scattered, and the bolts, etc. that fix the receiving frame to the underground structure are broken, and the lid receiving frame set together with the receiving frame is released. It also prevents it from scattering. However, the internal pressure caused by torrential rains in recent years, which is also called guerrilla rainstorms, is tremendous, and there are problems such as scattering of lock members separated from the lid body and falling into underground structures. Therefore, a lid receiving frame set has been proposed for the purpose of preventing the entire lock member from scattering (see, for example, Patent Document 4 and the like).

The lid receiving frame set described in Patent Document 4 has a claw portion formed separately from the lock body and a fixing pin for fixing the claw portion to the lock body. The fixing pin has a notch formed on the outer circumference, and the lid body rises with respect to the receiving frame due to an increase in internal pressure. When the internal pressure further increases, the fixing pin breaks at the notch position and the engaged state is released. Will be done. As a result, the lid is opened and the internal pressure is released. According to this lid receiving frame set, the claw portion, the fixing pin, the bolt for attaching the fixing pin to the lock body, and the like are scattered or dropped, and the entire lock member can be prevented from being scattered or dropped.

Japanese Unexamined Patent Publication No. 2003-239308 Jitsukaisho 63-45857 Japanese Unexamined Patent Publication No. 2-183019 Japanese Unexamined Patent Publication No. 2016-205123

However, in the lid receiving frame set described in Patent Document 4, even if the entire lock member can be prevented from scattering or falling, a large number of things such as fixing pins, claws, bolts, etc. that are broken and separated into a plurality of pieces may be scattered. It will fall. As mentioned above, the internal pressure caused by heavy guerrilla rainstorms in recent years is tremendous, and it is desirable to reduce the amount of guerrilla rainstorms that scatter or fall, even if they are small.

In view of the above circumstances, it is an object of the present invention to provide a lid receiving frame set for an underground structure, which is devised to reduce the amount of scattering or falling of a lock member.

The lid receiving frame set for an underground structure of the present invention that solves the above object is a lid receiving frame set for an underground structure provided with a receiving frame that defines an opening connected to the underground structure and a lid that closes the opening.
The lid body has a lid body supported on the inner peripheral surface of the receiving frame and provided with a key hole on the peripheral edge portion, a lock member provided on the lid body, and a regulating member provided on the lid body. And
The receiving frame has a claw receiving portion integrally provided at a position below the inner peripheral surface.
The regulating member has a valve body that closes the keyway and a shaft that is swingably supported by the lid body, and the valve body is urged in a direction that closes the keyway.
The lock member has a lock body, a shaft portion that swingably supports the lock body with respect to the lid body, and a claw portion provided integrally with the lock body, and the claw portion is the claw portion. While engaging with the claw receiving portion to prevent the opening of the opening , when the claw portion is swung so as not to engage with the claw receiving portion, the opening of the opening is allowed.
When the internal pressure of the underground structure increases in the engaged state in which the claw portion is engaged with the claw receiving portion, the claw portion is broken, the engaged state is released, and the opening is opened. der is,
The lock member is characterized by having a guide portion that guides the claw receiving portion so as to come into contact with the tip end side of the claw portion in the engaged state.

That is, the claw portion has a weaker strength than the claw receiving portion. Here, the claw portion may be provided with a notch for adjusting the strength (reducing the strength). If the mode in which the notch is provided is adopted, the portion where the claw portion breaks can be easily set at the position where the notch is provided. Further, even if the pressure (internal pressure) in the underground structure increases to the pressure at which the claw portion breaks, the shaft portion and the lock body have a strength that does not break. The lid receiving frame set for the underground structure has a hinge structure that connects the lid body to the receiving frame so as to be openable and closable, and the claw portion is broken in the engaged state to release the engaged state. Then, the lid body may be vertically inverted while being connected to the hinge structure to open the opening. Here, the guide portion adjusts the support point position of the force applied to the claw portion in the engaged state, and also specifies the support point position.

According to the lid receiving frame set for an underground structure of the present invention, when the internal pressure is further increased in the engaged state, the claw portion integrally provided with the lock body is broken to open the lid and the opening is opened. Be released. Therefore, regarding the destruction of the lock member, those that scatter or fall are limited to the broken claw portion, and those that scatter or fall can be reduced. Further, since the claw portion is integrally provided with the lock body, it can be easily manufactured by casting, for example, and the number of parts is small. The shaft portion may be provided integrally with the lock body, or may be formed of a pin or the like separate from the lock body. Further, in the engaged state, the contact portion where the claw receiving portion contacts the claw portion, that is, the position of the support point of the force applied to the claw portion can be guided to the tip end side of the claw portion. As a result, the force applied to the portion of the claw portion on the lock body side is increased, and the claw portion is likely to break.

Further, in the lid receiving frame set for an underground structure of the present invention, in the engaged state, the wall thickness of the contact portion with which the claw receiving portion is in contact is the thickness of the claw portion in the claw receiving portion. It may be thinner than the wall thickness of the contact portion in contact with.

That is, the moment of inertia of area of the contact portion is smaller in the claw portion than in the claw receiving portion. The wall thickness referred to here means the thickness in the direction in which the contact portion in line contact or surface contact along the horizontal direction intersects in the vertical plane. The receiving frame, the lock body, and the claw portion may be made of the same material, for example, both may be made of cast iron. The claw portion may have a wall thickness that increases from the contact portion toward the lock body, that is, a moment of inertia of area may increase. By doing so, the claw portion is more likely to break on the contact site side than the root (the portion on the lock body side), or near the contact portion, that is, on the tip side than the root, and the broken pieces that scatter or fall. Can be made smaller.

Further, in the lid receiving frame set for an underground structure of the present invention, the claw portion may have a fracture surface of a portion broken after the engaged state having a width larger than a height.

Width refers to the horizontal dimension.

In the relationship between the height and the moment of inertia of area of the width at the break of the claw portion, the height acts as a cube, so the height is the value of the force generated from the dimensional error in manufacturing compared to the width. The accuracy is low. Therefore, if the fracture surface of the claw portion is made larger in width than in height, the accuracy of the force can be improved. As a result, the strength of the claw portion is kept within the upper and lower limit values set from the viewpoint of the force of the lid body to bite into the receiving frame and the prevention of scattering of the lid body and the lid receiving frame set for each receiving frame. It will be easier to fit.

According to the present invention, it is possible to provide a lid receiving frame set for an underground structure, which is devised to reduce the amount of scattering or falling of the lock member.

It is sectional drawing of the lid receiving frame set for an underground structure which is one Embodiment of this invention. It is a figure which shows the lock member shown in FIG. It is a figure which shows the regulation member shown in FIG. It is a figure which shows the one end side part provided with the claw receiving part in the receiving frame shown in FIG. (A) is a cross-sectional view showing a state in which the internal pressure is increased more than a predetermined value and the lid body shown in FIG. 1 is lifted, and (b) is a claw portion and a claw in a portion B surrounded by a circle in (a). It is a figure which shows the engagement state with a receiving part in an enlarged manner. It is a figure which shows the state which the claw part and the claw receiving part engage with each other in the modification. It is a figure which enlarges and shows the one end side part in the cover receiving frame set for underground structures shown in FIG.

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

FIG. 1 is a cross-sectional view of a lid receiving frame set (cover receiving frame set for an underground structure) according to an embodiment of the present invention. Although the ground G is shown in FIG. 1, the ground G may be omitted in other drawings in order to simplify the drawing.

FIG. 1 shows a cross section of a lid receiving frame set 10 including a lid body 2 having a disk-shaped lid body 4 and a tubular receiving frame 3 supporting the lid body 2 in a straight line passing through the center of the lid body 4. It is shown how it was done. In the following description, with reference to the cross-sectional view of FIG. 1, the left-right direction is referred to as a radial direction, the left side is referred to as one end side, and the right side is referred to as the other end side. The drainage pipe for sewerage, 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 drainage pipe for sewerage. Both sewer drainage pipes 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 3 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 31.

The lid body 2 has a lock member 5, a regulation member 6, and a hinge member 7 in addition to the lid main body 4. The lid body 4 is supported by the inner peripheral surface 31 of the receiving frame 3 to open and close the opening, and the lid body 2 shown in FIG. 1 closes the opening by fitting the lid body 4 to the receiving frame 3. (Closed). The lid body 4 is made of cast iron, and ribs 41 for reinforcement are 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 key hole 4a for inserting an opening / closing tool is provided on the peripheral edge of the lid main body 4 on one end side.

As shown in FIG. 1, the hinge member 7 is rotatably connected to the peripheral edge of the lower surface of the lid main body 4 on the other end side by a shaft 73. The hinge member 7 includes a hook-shaped protrusion 71 formed in an intermediate portion thereof and a retaining protrusion 72 formed in a lower end portion thereof. Further, a hinge seat 33 is provided at a position below the inner peripheral surface 31 on the other end side of the receiving frame 3. The hinge seat 33 is provided with a through hole 331 through which the hinge member 7 penetrates in the vertical direction and an engaged portion 332. The hinge structure is formed by the hinge member 7 and the hinge seat 33, and the lid body 4 can be turned 360 degrees or turned 180 degrees. Further, when the internal pressure (pressure in the manhole) becomes higher than a predetermined value, the lid 2 is lifted, the lid body 4 is lifted from the closed state, and the claw portion 53 is engaged with the claw receiving portion 32 as described in detail later. Then, the hook-shaped protrusion 71 of the hinge member 7 engages with the engaged portion 332 of the hinge seat 33. The retaining protrusion 72 is a portion that abuts on the hinge seat 33 when the lid 2 is lifted, and when the lid 2 is lifted until the retaining protrusion 72 abuts on the hinge seat 33, the lid body 4 can be vertically inverted. can.

The locking member 5 and the regulating member 6 are provided on the peripheral edge portion on one end side of the lower surface of the lid main body 4. Further, a claw receiving portion 32 is provided at a position below the inner peripheral surface 31 on one end side of the receiving frame 3. The claw receiving portion 32 is a portion that protrudes diagonally downward in the cross section of FIG. 1, and will be described in detail later.

FIG. 2 is a diagram showing a lock member shown in FIG. FIG. 2B is an enlarged right side view of the lock member 5 of FIG. 1, and FIG. 2A is a front view of the lock member 5 of FIG. 1 as viewed from one end side. The left-right direction in FIG. 2A is the width direction of the lock member 5.

As shown in FIG. 2, the lock member 5 has a lock body 51, a pair of shaft portions 52, 52, a claw portion 53, and a pair of guide portions 54, 54, which are integrally formed. It is made of cast iron. As shown in FIG. 2A, the lock body 51 has a pair of strut portions 511,511 standing on both sides in the width direction, and a base portion 512 connecting the pair of strut portions 511,511 on the lower end side. Front view is approximately U-shaped or approximately U-shaped. The base portion 512 is provided with a portion that extends in the width direction from the pair of strut portions 511 and 511, and this portion serves as a weight. Shafts 52 projecting outward in the width direction are provided at the upper ends of the pair of support columns 511,511, respectively, and the lock body 51 can be swung on the lid body 4 by the pair of shafts 52, 52. It is supported.

As shown in FIG. 2B, the claw portion 53 is a portion of the base portion 512 that protrudes diagonally upward from the radial outer surface (left side in the drawing), and extends from the root 53b on the lock body 51 side to the tip 53a. It is formed so that the wall thickness becomes thinner as it goes toward it. Further, as shown in FIG. 2A, the claw portion 53 is arranged at the central portion of the lock member 5 in the width direction. The pair of guide portions 54, 54 are triangular protrusions, and as shown in FIG. 2A, are provided on both sides of the claw portion 53 in the width direction. On the upper surface of each of the pair of guide portions 54, 54, an inclined surface 54a inclined obliquely downward toward the outside in the radial direction is formed. When the internal pressure becomes higher than a predetermined value, the lid 2 is lifted, the lid body 4 is lifted from the closed state, and the hook-shaped protrusion 71 of the hinge member 7 is engaged with the engaged portion 332 of the hinge seat 33 as described above. Then, the claw portion 53 engages with the claw receiving portion 32 shown in FIG. 1 while being guided by the inclined surface 54a of the guide portion 54.

FIG. 3 is a diagram showing the regulatory member shown in FIG. In FIG. 1, a part of the regulation member 6 is hidden by the lock member 5, but FIG. 3B is a right side view showing the regulation member 6 of FIG. 1 extracted and enlarged, and FIG. 3 (a). ) Is a front view of the regulating member 6 of FIG. 1 as viewed from one end side.

As shown in FIGS. 1 and 3, the regulating member 6 has a valve body 61 that closes the key hole 4a of the lid main body 4, and is inserted into the insertion hole 62a shown in FIG. 3 (b). The regulating member 6 is swingably supported by the lid body 4 by the shaft pin 62 shown in 1. Further, the regulating member 6 has weight portions 63 on both sides in the width direction of the lower end side portion. The pair of weight portions 63, 63 and the torsion spring 64 shown in FIG. 1 urge the regulating member 6 in a direction in which the valve body 61 closes the keyway 4a. Further, as shown in FIG. 1, in the regulating member 6, the pair of weight portions 63, 63 abuts on the right side (inner side in the radial direction) surface of the lock body 51, and the locking member 5 swings counterclockwise. Is regulated.

FIG. 4 is a diagram showing one end side portion of the receiving frame shown in FIG. 1 provided with a claw receiving portion. Specifically, FIG. 4A is a plan view of a portion of the receiving frame 3 on one end side as viewed from above. FIG. 4B is a view of one end side portion of the receiving frame 3 viewed from the inside in the radial direction, and corresponds to a view of FIG. 4A viewed from the lower side of the figure. FIG. 4C is a cross-sectional view taken along the line AA of FIG. 4B, and FIG. 4D is a bottom view of a portion of the receiving frame 3 on one end side as viewed from below.

As shown in FIG. 4, the claw receiving portion 32 is formed in a bag shape (dome shape). As a result, as will be described in detail later, the space S (see FIG. 4C) into which the claw portion 53 is inserted when the lid body 2 is lifted is defined by the claw receiving portion 32.

Even if an attempt is made to open the lid in the state shown in FIG. 1, the claw portion 53 engages with the claw receiving portion 32, and the opening of the lid is prevented. To open the lid, first, using a T-shaped opening / closing tool (not shown), the valve body 61 is pressed to swing the regulating member 6 counterclockwise, and the tip of the opening / closing tool is inserted through the keyway 4a. Next, the tip of the opening / closing tool inserted from the key hole 4a swings the lock member 5 in a posture in which the claw portion 53 does not engage with the claw receiving portion 32, whereby the lid can be opened. That is, in the lid receiving frame set 10 of the present embodiment, the regulating member 6 and the locking member 5 are independently shaken by the opening / closing tool inserted from the key hole 4a, similarly to the lid receiving frame set described in Patent Document 3 described above. It works. FIG. 7 is an enlarged view of one end side portion of the cover receiving frame set for an underground structure shown in FIG. As shown in FIG. 7, the lid main body 4 is formed with a support groove 4b that supports the shaft pin 62 of the regulation member 6. The support groove 4b extends in the horizontal direction. The portion of the support groove 4b hidden by the regulating member 6 is indicated by a broken line. When the valve body 61 is pressed and the regulating member 6 is swung counterclockwise using an opening / closing tool, the tip of the valve body 61 comes into contact with the inner peripheral surface 31 of the receiving frame 3 to resist the urging force of the torsion spring 64. The shaft pin 62 moves to the other end side. As a result, the regulating member 6 can be swung without the valve body 61 being caught on the inner peripheral surface 31 of the receiving frame 3.

FIG. 5A is a cross-sectional view showing how the lid shown in FIG. 1 is lifted when the internal pressure rises more than a predetermined value.

When the internal pressure rises above a predetermined level due to torrential rain or the like, the lid 2 is lifted as shown in FIG. 5 (a). Specifically, the lid main body 4 is levitated by the height h, the hook-shaped protrusion 71 of the hinge member 7 is engaged with the engaged portion 332 of the hinge seat 33, and the claw portion 53 is in the space S (FIG. 4 (FIG. 4). c) It is inserted into) and engaged with the claw receiving portion 32. As a result, the internal pressure is released from the gap between the lid main body 4 and the receiving frame 3.

FIG. 5B is an enlarged view showing the engagement state between the claw portion and the claw receiving portion in the portion B surrounded by the circle in FIG. 5A. In addition, in FIG. 5B, in order to simplify the drawing, only the lock member 5 and the receiving frame 3 are shown, and the end face of the receiving frame 3 is shown.

As shown in FIG. 5B, the claw portion 53 in the engaged state is inserted into the space S (see FIG. 4C) and guided by the inclined surface 54a of the guide portion 54, and the claw receiving portion 32 Is engaged with. In the engaged state shown in FIG. 5B, the claw receiving portion 32 is also in contact with the guide portion 54, but depending on the state of internal pressure or the like, the claw receiving portion 32 is in contact with the guide portion 54 in the engaged state. It may be separated from. Further, in FIG. 5B, the lock member 5 does not swing in the engaged state, but the claw portion 53 engages with the claw receiving portion 32 in a posture in which the lock member 5 swings counterclockwise. There is also.

In the present embodiment, the claw portion 53 and the claw receiving portion 32 are in linear or planar contact along a horizontal direction (width direction shown in FIGS. 2 and 3) orthogonal to the paper surface. The wall thickness L1 of the contact portion T on the claw portion 53 side with which the claw receiving portion 32 contacts is thinner than the wall thickness L2 of the contact portion T'on the claw receiving portion 32 side with which the claw portion 53 contacts. The wall thickness here means the thickness in the direction in which the contact portions T and T'along the horizontal direction intersect in the vertical plane.

In the engaged state shown in FIG. 5, when the internal pressure is further increased, the claw portion 53 is broken and the engaged state is released. Here, the portion where the claw portion 53 breaks varies depending on the state of the internal pressure, the dimensional error in manufacturing, and the like. The cross section (broken cross section) of the fractured part is shown by enclosing it in a single-dot chain line circle.

The claw portion 53 of the present embodiment has a fracture surface larger in width L3 than in height H, as shown by being surrounded by a chain line circle, regardless of where the claw portion 53 is broken. Is formed in. Here, in the relationship between the height at the break of the claw portion 53 and the moment of inertia of area of the width, the force acts on the cube of the height, so the height is the force generated from the dimensional error in manufacturing compared to the width. The accuracy of the value of is low. Therefore, if the fracture surface of the claw portion 53 is made larger in the width L3 than in the height H, the accuracy of the force can be improved, and thus the strength of the claw portion 53 can be kept within a predetermined range. It will be easier. Here, the upper and lower limit values of the strength of the claw portion 53 are, for example, from the viewpoint of the biting force of the lid main body 4 into the receiving frame 3, the scattering of the lid main body 4, the scattering of the lid receiving frame set 10 for each receiving frame 3, and the like. Set from. Further, in the claw portion 53, a notch 531 indicated by a alternate long and short dash line is formed on the side of the claw portion 53 that comes into contact with the claw receiving portion 32 or on the opposite side thereof to weaken or adjust the strength of the claw portion 53. May be good. Further, by forming the notch 531 it is possible to set a position where the claw portion 53 breaks at a desired position. The parts of the lock member 5 other than the claw portion 53, such as the shaft portion 52 and the strut portion 511, are set to have a strength that does not break even if the internal pressure increases to the pressure at which the claw portion 53 breaks.

When the claw portion 53 is broken and the engaged state is released, the hinge member 7 swings around the shaft 73 due to the internal pressure, and the uncinate process 71 is disengaged from the engaged portion 332 of the hinge seat 33. Next, the lid body 2 is lifted and the lid body 4 is vertically inverted until the retaining protrusion 72 abuts on the hinge seat 33. Depending on the internal pressure, the uncinate process 71 of the hinge member 7 does not disengage from the engaged portion 332 of the hinge seat 33, and the lid body 4 opens to a vertical position and then closes without reversing. It may return. In either case, the lid is opened (opening is open) to release the internal pressure. As a result, the sewer pipes and the like are damaged, the lid body 4 is scattered due to the destruction of the hinge structure, and the bolts and the like for fixing the receiving frame 3 to the manhole are damaged and the lid receiving frame set 10 for each receiving frame 3 is scattered. Be prevented. Further, regarding the destruction of the lock member 5, the portion to be broken is limited to the claw portion 53, and it is possible to reduce the number of scattered or dropped portions. In particular, since the claw portion 53 of the present embodiment is formed so that the wall thickness becomes thicker from the contact portion T toward the root 53b, the claw portion 53 is on the contact portion T side or in contact with the root 53b. It becomes easier to break near the portion T, that is, on the tip 53a side of the root 53b of the claw portion 53, and the scattered or falling fragment can be reduced.

Further, in the present embodiment, a guide portion 54 is provided to guide the claw receiving portion 32 so as to come into contact with the tip end 53a side of the claw portion 53. The contact portion T of the claw portion 53 with which the claw receiving portion 32 comes into contact is the support point position of the force applied to the claw portion 53 in the engaged state. Therefore, the closer the contact portion T is to the tip 53a side of the claw portion 53, the greater the force acting on the portion of the claw portion 53 on the root 53b side of the contact portion T, and the claw portion 53 is more likely to break. .. If the contact portion T is too close to the tip 53a, the engagement state with the claw receiving portion 32 may become unstable. Further, even if the lid is opened for the purpose of illegal dumping or illegal invasion, it is necessary to prevent the claw portion 53 from breaking. From these viewpoints, it is desirable to adjust the position of the contact portion T.

Furthermore, as described above, in the present embodiment, the claw receiving portion 32 is formed in a bag shape, and in the engaged state, the inside of the space S defined by the claw receiving portion 32 (see FIG. 4C). The claw portion 53 is inserted into the space. Therefore, when the claw portion 53 is broken, it is possible to suppress the scattering of the broken pieces.

Next, a modified example of the set of the lid receiving frames shown in FIGS. 1 to 5 will be described. In the modification described below, the differences from the embodiments shown in FIGS. 1 to 5 will be mainly described, and the constituent elements having the same names as the constituent elements in the embodiments shown in FIGS. 1 to 5 will be described. , The description will be given with the reference numerals used so far, and duplicate explanations may be omitted.

FIG. 6 is a diagram showing how the claw portion and the claw receiving portion engage with each other in the modified example. In this modification, the form of the guide portion 54 is different from that of the lid receiving frame set of the above embodiment, and FIG. 6 shows only the lock member 5 and the receiving frame 3 as in FIG. 5 (b). There is.

In FIG. 6A, the inclined surface 54a of the guide portion 54 of the above embodiment is shown by a chain line, and in the guide portion 54'of this modified example, the inclined surface 54a'is the inclined surface 54a of the above embodiment. In comparison, it is formed so as to be higher on the diagonally outward side in the radial direction. Therefore, when the internal pressure increases and the lid body 2 rises from the closed state shown in FIG. 1, the inclined surface 54a'of the guide portion 54'contacts the claw receiving portion 32, and the lock member 5 rotates counterclockwise. It swings to. Eventually, as shown in FIG. 6 (b), the claw receiving portion 32 comes into contact with the tip 53a side of the claw portion 53 and engages with the guide portion 54', as compared with the embodiment shown in FIG. 5 (b). It will be in a combined state. As a result, the contact portion T is on the tip 53a side of the claw portion 53, and the claw portion 53 is easily broken.

In this way, the guide portion 54'guides the contact portion T of the claw portion 53 to which the claw receiving portion 32 contacts in the engaged state toward the tip end side, and determines the position of the support point of the force applied to the claw portion 53. It leads to the tip 53a side of the claw portion 53. Further, the guide portion 54'adjusts the support point position of the force applied to the claw portion 53 in the engaged state, and also specifies the support point position.

According to the lid receiving frame set 10 described above, it is possible to reduce the number of pieces that scatter or fall with respect to the destruction of the lock member 5.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, similarly to the lid receiving frame set described in Patent Document 2, a mode in which the lock member is swung by being pushed by the regulating member swung by the opening / closing tool may be adopted.
In addition, the lid receiving frame set for underground structures described so far is
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.
The lid body has a lid body supported on the inner peripheral surface of the receiving frame and provided with a key hole on the peripheral edge portion, a lock member provided on the lid body, and a regulating member provided on the lid body. And
The receiving frame has a claw receiving portion integrally provided at a position below the inner peripheral surface.
The regulating member has a valve body that closes the keyway and a shaft that is swingably supported by the lid body, and the valve body is urged in a direction that closes the keyway.
The lock member has a lock body, a shaft portion that swingably supports the lock body with respect to the lid body, and a claw portion provided integrally with the lock body, and the claw portion is the claw portion. While engaging with the claw receiving portion to prevent the opening of the opening, when the claw portion is swung so as not to engage with the claw receiving portion, the opening of the opening is allowed.
When the internal pressure of the underground structure increases in the engaged state in which the claw portion is engaged with the claw receiving portion, the claw portion is broken, the engaged state is released, and the opening is opened. It may be characterized by being.

10 Lid receiving frame set 2 Lid body 3 Receiving frame 31 Inner peripheral surface 32 Claw receiving part 33 Hinge seat 4 Lid body 5 Locking member 51 Locking body 52 Shaft part 53 Claw part 531 Notch
54, 54'Guide part 6 Regulatory member 7 Hinge member L1 Wall thickness L2 Wall thickness L3 Width T, T'Contact part

Claims (3)

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.
The lid body has a lid body supported by the inner peripheral surface of the receiving frame and provided with a key hole at the peripheral edge portion, a lock member provided on the lid body, and a regulating member provided on the lid body. And
The receiving frame has a claw receiving portion integrally provided at a position below the inner peripheral surface.
The regulating member has a valve body that closes the keyway and a shaft that is swingably supported by the lid body, and the valve body is urged in a direction that closes the keyway.
The lock member has a lock body, a shaft portion that swingably supports the lock body with respect to the lid body, and a claw portion provided integrally with the lock body, and the claw portion is the claw portion. While engaging with the claw receiving portion to prevent the opening of the opening, when the claw portion is swung so as not to engage with the claw receiving portion, the opening of the opening is allowed.
When the internal pressure of the underground structure increases in the engaged state in which the claw portion is engaged with the claw receiving portion, the claw portion is broken, the engaged state is released, and the opening is opened. der is,
A lid receiving frame set for an underground structure, wherein the locking member has a guide portion that guides the claw receiving portion so as to come into contact with the tip end side of the claw portion in the engaged state. The claw portion has a wall thickness of a contact portion in contact with the claw receiving portion in the engaged state, which is thinner than the wall thickness of the contact portion in contact with the claw portion in the claw receiving portion. The lid receiving frame set for an underground structure according to claim 1, wherein the lid receiving frame set is characterized by the above. The lid receiving frame set for an underground structure according to claim 1 or 2, wherein the claw portion has a fracture surface of a portion broken after the engaged state having a width larger than a height.

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