JP2005155042A - Closing device of inspection port - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a closing device of an inspection port having a closing cover having a locking mechanism, for preventing opening of the closing cover by a malicious third party, by providing the closing device of the inspection port having engaging bodies engaging with a frame receiving member in the closing cover with sufficient strength. <P>SOLUTION: The closing cover 4 is provided with a plurality of engaging bodies 6 freely engageable with and disengageable from the frame receiving member 3 in a closing state of the inspection port 2, an engaging-disengaging operation mechanism 27 for engaging and disengaging the engaging bodies 6 by external operation from above the closing cover 4, and a blocking-up member 40 freely attachable and detachable by covering an operation part upper part of this engaging-disengaging operation mechanism 27. The blocking-up member 40 is provided with the locking mechanism capable of locking and unlocking an installation state to the closing cover 4 by operation of an insertable-extractable key 41. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a closing device that can be used in an inspection port of an underground structure.

  In this specification, the underground structure refers to all pipes buried along a main road or the like. In particular, recent underground structures include information-related facilities for accommodating transmission lines, communication lines (optical fibers) and the like as well as water-related ones. In this type of underground structure, there is an inspection port that leads to the ground in the middle of the pipeline, and this inspection port has a diameter as large as a manhole where workers can enter, and only hands are used. There are various types, even those with a diameter as small as a hand hole to be inserted. Work such as inspection, connection change, new installation, etc. of the optical fiber provided in the pipe line is performed through such an inspection port.

In this type of underground structure, it is common for the inspection port to be provided with an upper cover (manhole cover, etc.) facing the ground, but if the underground structure is an information-related facility as described above, For the purpose of enhancing security, another closing device is provided on the lower side of the upper lid. Such a closing device may be provided from the beginning for a new inspection port, but may be retrofitted to an existing inspection port.
Conventionally, as a closing device that can be adopted for an inspection port of an underground structure, it has a receiving frame member provided on the inner wall of the inspection port and a closing lid that is supported by the receiving frame member and closes the inspection port. There is known an engagement body that is provided so as to be movable toward and away from the inner wall of the inspection port, and this engagement body is engaged with or disengaged from the receiving frame member by a withdrawal operation (for example, Patent Document 1). Etc.).

The specific structure for moving the engaging body out and out is that a vertical shaft is provided to be able to rotate downward at the center of the lower surface of the closing lid, and a pinion gear is provided on the vertical shaft, and meshes with the pinion gear. Thus, the rack gear itself forms an engaging body having a hook shape in the horizontal direction. That is, the engaging body is withdrawn and retracted by rotating the vertical shaft from the upper surface of the closing lid.
Japanese Patent No. 2847435 (Pages 2 and 3, FIG. 3)

In the above-described conventionally known closing device, the engaging body is held in a cantilever state and is engaged with the receiving frame member, so that it is weak in strength. Therefore, if the closing lid is forcibly lifted upward, the engaging body may be bent and deformed, and the closed state by the closing lid may be released relatively easily.
Further, since the vertical shaft can be easily rotated from the upper surface of the closing lid, there is no denying the possibility that a malicious third party (including mischief) may open the closing lid.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an inspection port closing device in which an engagement body that engages with a receiving frame member is provided in a closing lid with sufficient strength. It is another object of the present invention to provide an inspection port closing device having a closing lid provided with a locking mechanism in order to prevent the opening of the closing lid by a malicious third party.

In order to achieve the above object, the present invention has taken the following measures.
That is, the inspection port closing device according to the present invention has a receiving frame member provided on the inner wall of the inspection port that leads to the underground structure, and a closing lid that is supported by the receiving frame member and closes the inspection port. The lid includes a plurality of engagement bodies that can be engaged with and disengaged from the receiving frame member when the inspection port is closed, an engagement / disengagement operation mechanism that engages / disengages the engagement body by an external operation from above the closure lid, and the engagement / disengagement. There is provided a closing member that is detachably mounted so as to close the upper portion of the engaging / disengaging operation mechanism so that the operating mechanism cannot be operated, and the closing member is attached to the engaging / disengaging operation mechanism by operating a key that can be inserted and removed. A locking mechanism is provided that enables locking of the state.

If it is such a structure, if the upper part of the operation part (for example, tool engaging part etc.) is covered with a blocking member as needed with respect to the engagement / disengagement operation mechanism, this operation part is hidden from a third party. be able to. In addition, since the locking member is provided with a locking mechanism, if the locking mechanism is locked by operating the key and the key is removed, removing the blocking member from the operation part of the engagement / disengagement operation mechanism itself, It cannot be done by a third party. For this reason, it is possible to prevent the closing lid from being opened by a malicious third party.
A cover cap that covers the key insertion part of the locking mechanism may be detachably provided on the closing lid in a state where the closing member is mounted.

In this way, since the blocking member can cover even the key insertion portion of the locking mechanism, the existence of the locking mechanism itself can be made unknown to a third party. As a result, the opening of the closure lid by a malicious third party can be further prevented.
In the closing lid, it is preferable that the operation portion of the engagement / disengagement operation mechanism is positioned at the center of the closing lid.
In this way, for those who intend to properly operate the engagement / disengagement operation mechanism, the operation part of the engagement / disengagement operation mechanism is positioned equally from any direction around the closure lid, making it easy to find and operate. It becomes easy.

A positioning pin for positioning the support position by engaging with the closing lid with respect to the receiving frame member protrudes upward, and the protruding position of the positioning pin may be made variable. Thereby, a lid position adjusting means that can adjust the supporting position of the closing lid is configured, and the supporting position of the closing lid in the inspection port can be appropriately adjusted.
The opening shape of the inspection port may be circular but may be rectangular. In this case, the closing lid is also formed in a square shape in accordance with the opening shape of the inspection port.

  In the closing device for the inspection port according to the present invention, the engaging body that engages with the receiving frame member is provided on the closing lid with sufficient strength, and even if the closing lid is lifted upwards, it is closed by the closing lid. The state cannot be released. Further, by providing the locking mechanism, it is possible to prevent the closing lid from being opened by a malicious third party.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show a first embodiment of a closing device 1 according to the present invention. The closing device 1 includes a receiving frame member 3 provided on the inner wall 2a of the inspection port 2 and a closing lid 4 that is supported by the receiving frame member 3 so that the inspection port 2 can be closed. In the first embodiment, the inspection port 2 is assumed to be a circular opening.
The closing lid 4 is formed to have a main body plate 4a and an outer peripheral side plate 4b formed so as to surround the entire circumference of the main body plate 4a. Since the inspection port 2 is a circular opening as described above, the main body plate 4a of the closing lid 4 is also formed in a circular shape having a size that can enter the inspection port 2 and be closed. Accordingly, the receiving frame member 3 is also formed in an annular shape along the inner wall 2a of the inspection port 2 so that the outer peripheral side plate 4b of the closing lid 4 can be supported from below.

Furthermore, since the opening on the ground side of the inspection port 2 is closed by the upper lid 5 and is configured to be opened / closed (or attached / detached) as necessary, the receiving frame member 3 has a contact interference with the upper lid 5 by the closing lid 4. In order to prevent this, the closing lid 4 is provided so as to be lowered to a position where the closing lid 4 can be stored in the inspection port 2.
On the lower surface side of the closing lid 4, a plurality of (two in the illustrated example) engaging bodies 6 having a bowl shape in the horizontal direction are provided with their respective distal end portions 6 a facing outward in the radial direction. These engaging bodies 6 are slidable along their longitudinal directions, and these engaging bodies 6 project outward in the radial direction of the closing lid 4 while the closing lid 4 is supported by the receiving frame member 3. When this is done, the distal end portion 6a of the engaging body 6 and the receiving frame member 3 engage with each other, and the closing lid 4 engages with the supporting member 3 (the inspection port 2 is closed so that it cannot be detached). . A handle 7 is provided on the upper surface of the closing lid 4 so that the opening / closing operation can be easily performed.

As shown in FIGS. 1 to 3, the receiving frame member 3 has a circular arc-shaped frame component 9 attached in the circumferential direction along the inner wall 2 a of the inspection port 2. In the first embodiment, three frame components 9 are used to make one round of the inner periphery of the inspection port 2. Each frame component 9 has the same structure and the same size, and its cross-sectional shape is a vertical portion 10 attached to the inner wall 2a and a horizontal portion 11 projecting radially inward from the upper portion of the vertical portion 10. It has an L shape.
The frame component 9 is fixed to the inner wall 2 a of the inspection port 2 by driving the vertical portion 10 into the inner wall 2 a with the anchor bolt 12. For this reason, the vertical portion 10 is provided with a bolt insertion portion 13 for allowing the anchor bolt 12 to pass therethrough. The bolt insertion portions 13 were provided at a total of three locations, that is, both ends in the longitudinal direction of the frame component 9 and intermediate portions in the longitudinal direction.

And among these, the bolt insertion part 13 provided in the both ends of the frame component 9 is adjacent to each other, as shown in an enlarged view in FIG. The frame components 9 to be formed are overlapped with each other. Since these notches have a predetermined length in the circumferential direction, the overall outer diameter of the receiving frame member 3 can be adjusted by changing the overlapping length in the circumferential direction. As a result, it is possible to cope with variations in the inner diameter of the inspection port 2 and the opening size (size difference).
In each frame component 9, a separate joint plate 14 is joined to one end portion in the longitudinal direction on the inner peripheral surface side of the vertical portion 10 by welding to form a notch in the joint plate 14. By forming one notch in the joint plate 14 in this way, it is possible to absorb the thickness effect when the longitudinal end portions (notches on both sides) are overlapped between the adjacent frame constituent members 9, which is preferable. is there.

  A pin support hole 15 that is a long hole along the radial direction is formed in the horizontal portion 11 of the frame component 9, and a positioning pin 16 with its axis oriented in the vertical direction is located above the pin support hole 15. It is attached in a protruding state. The positioning pin 16 has a structure in which a male screw end protruding downward is inserted into the pin support hole 15, and a nut 17 is screwed into a portion that has penetrated the pin support hole 15 to be fixed to the frame component 9. Since the pin support hole 15 of the frame component 9 is a long hole as described above, the positioning pin 16 can be moved within the long diameter of the pin support hole 15 if the nut 17 is loosened. It can be said that the nut 17 is tightened after the position adjustment.

  As a whole, the receiving frame member 3 is provided with positioning pins 16 in at least three places in the circumferential direction (in the first embodiment, each is provided in the middle portion in the longitudinal direction of each frame component 9). At least three positioning pins 16 are brought into contact with the outer peripheral side plate 4b of the closing lid 4 from the inside to prevent the closing lid 4 from rattling and positioning with respect to the receiving frame member 3. That is, as described above, the protruding positions of the positioning pins 16 can be changed in the individual frame components 9 of the receiving frame member 3, so that the opening of the closing lid 4, that is, the inspection port 2 with respect to the receiving frame member 3. The closing lid 4 can be positioned or adjusted in the inside, and thereby the lid position adjusting means 20 is constituted.

  As described above, in the first embodiment, the closing lid 4 is provided with two engaging bodies 6, but both engaging bodies 6 are provided with their respective midway portions in the longitudinal direction hanging from the lower surface of the main body plate 4 a. The grooved guide 23 is held so as to be at a lower level than the outer peripheral side plate 4b. These groove-type guides 23 are positioned so that both engaging bodies 6 are parallel to each other in the longitudinal direction on both sides of the circular center of the main body plate 4a. The two engaging bodies 6 held by the groove-type guides 23 are provided with their rear end portions toward the circular center of the main body plate 4 a in the closing lid 4.

Accordingly, both the engaging members 6 are guided and held by the groove-type guide 23, and their tip portions 6a can be protruded or retracted outward in the radial direction of the closing lid 4. Needless to say, the rear end portions are separated from each other when the front end portions 6a of both engaging bodies 6 protrude radially outward of the closing lid 4, and the rear end portions are close to each other when the front end portion 6a is retracted. .
The closing lid 4 is provided with an engagement / disengagement operation mechanism 27. The engagement / disengagement operation mechanism 27 includes a bearing boss 28 provided on the upper surface side of the main body plate 4a, an operation rotation shaft 29 housed and held in the bearing boss 28, and a bearing boss 28 on the lower surface side of the main body plate 4a. And a connecting link 30 provided corresponding to the lower part.

  As shown in FIG. 5, the bearing boss 28 has, for example, a thick and short cylindrical shape, and a portion corresponding to a cylindrical hole at the center is a shaft hole 32 penetrating in the vertical direction. An operation rotation shaft 29 is accommodated in the shaft hole 32. The operation rotation shaft 29 is held in a state of sinking to a predetermined depth position in the shaft hole 32, and is held in a state in which shaft movement (vertical movement) is prevented while being rotatable without rattling. . An appropriate tool engaging recess 33 is provided on the upper surface of the operation rotation shaft 29. The tool engaging portion 33 is a concave portion (or may be a convex portion) having an opening that is a rotationally asymmetric shape such as a square shape, a hexagonal shape, or a cross-shaped groove in plan view.

The bearing boss 28 is positioned at the circular center of the main body plate 4 a in the closing lid 4. In the main body plate 4 a of the closing lid 4, at least a portion corresponding to the shaft hole 32 of the bearing boss 28 is penetrated. On the other hand, the operation rotating shaft 29 is long enough to penetrate the shaft hole 32 of the bearing boss 28 downward. It has become a thing. That is, the operation rotation shaft 29 has a portion protruding downward on the lower surface side of the main body plate 4a, and the connecting link 30 is coupled to the protruding portion.
The connecting link 30 is a rod-like member protruding to both sides in the radial direction of the operation rotation shaft 29 (see FIG. 2 and the like), and can be turned integrally with the rotation of the operation rotation shaft 29. The rear end portion of the engaging body 6 is connected to both end portions of the connecting link 30 via a connecting pin 34 so as to be rotatable.

The bottom surface of the main body plate 4a of the closing lid 4 is a bottom that covers the connecting portion (position where the connecting pin 34 is provided) between the connecting link 30 and the engaging body 6 from below when the connecting link 30 turns. A cover 35 is provided.
When the bearing boss 28 is viewed from above in the engagement / disengagement operation mechanism 27, the tool engagement portion 33 of the operation rotation shaft 29 is provided in a state where the bearing boss 28 is submerged in the shaft hole 32. This tool engagement portion 33 constitutes an operation portion as the engagement / disengagement operation mechanism 27.
In this engagement / disengagement operation mechanism 27, a tool 36 (a tool head 36a that can be uniquely engaged with the tool engagement recess 33) is appropriately provided at the tip from the upper side of the closing lid 4 to the operation portion (tool engagement recess 33). The tool 36 is used to perform a turning operation. That is, when the tool 36 is rotated, the operation rotation shaft 29 rotates in the bearing boss 28, and the connecting link 30 rotates together with the operation rotation shaft 29 on the lower side of the closing lid 4. As the connecting link 30 turns, the engaging body 6 is slid by the groove-type guide 23. As described above, the sliding of the engaging body 6 causes the distal end portion 6a to protrude or retract toward the outside in the radial direction of the closing lid 4.

In order to facilitate the turning operation of the tool 36, it is preferable to provide a guide cylinder 37 that fits into the shaft hole 32 of the bearing boss 28 without rattling at the base of the tool head 36a.
The engagement / disengagement operation mechanism 27 is provided with a closing member 40 that covers an upper portion of the operation portion (tool engagement recess 33) and is detachable. A cylinder lock or the like in which a locking piece 42 is projected and retracted on the outer peripheral surface or the like by the operation of a key 41 that can be inserted and removed, and the closing member 4 can be attached / unlocked to the closing lid 4 (in the shaft hole 32) The key insertion part 43 for operating this locking mechanism (that is, for inserting / removing the key 41) is provided on the upper surface. Furthermore, a cover cap 44 that covers the key insertion portion 43 of the locking mechanism is detachably provided in a state where the closing member 40 is mounted.

When the closing member 40 and the cover cap 44 are fitted in the shaft hole 32, the upper surface of the bearing boss 28 is substantially flat, and the color of the cover cap 44 is the same as that of the upper surface of the bearing boss 28 (surface state). By doing so, it is devised so that the existence of the shaft hole 32 is not conspicuous.
Specifically, the closing member 40 and the cover cap 44 are fitted into the shaft hole 32 so as to fill a portion where the operation rotation shaft 29 is depressed. Note that it is preferable that the cover cap 44 be formed of a material exhibiting flexibility such as rubber or plastic, because the cover cap 44 can be easily attached and detached and a waterproof effect on the key insertion portion 43 of the closing member 40 is obtained. It can also be formed of metal or hard plastic. Such a cover cap 44 is preferably connected to the closing member 40 or the bearing boss 28 with a chain, a belt or the like in order to prevent loss.

The closing device 1 having such a configuration is such that the bolt insertion portion 13 is formed by superimposing the three frame constituent members 9 on the inner wall 2a of a predetermined depth with respect to the newly installed or existing inspection port 2 and the both longitudinal ends thereof. (See FIG. 4), the anchor bolt 12 is driven into the bolt insertion portion 13 to fix it, and the receiving frame member 3 is assembled. At this time, since the inspection port 2 is made of concrete, there may be a dimensional error or a variation in roundness. Therefore, the overlap amount of the frame component 9 is appropriately adjusted to absorb these.
Further, in the receiving frame member 3 assembled in this way, the positioning pins 16 of the frame constituent members 9 are appropriately moved and fixed along the radial direction, and the outer peripheral side plates 4b of the closing lid 4 are fixed by the positioning pins 16. The position at which the inner peripheral surface of the inspection lid abuts, that is, the position of the closing lid 4 that closes the inside of the inspection port 2 is adjusted.

After such installation is completed, the inspection port 2 is closed with the closing lid 4 under actual use as follows. That is, first, the closing lid 4 is placed over the receiving frame member 3 in the inspection port 2 so that the inspection port 2 is closed by the closing lid 4. In this state, the closing lid 4 still remains movable up and down with respect to the receiving frame member 3.
Therefore, the tool head 36a of the tool 36 is inserted into the shaft hole 32 of the bearing boss 28 from above the closing lid 4, and this is engaged with the operating portion (tool engaging recess 33) in the shaft hole 32, and then this tool is used. 36 is rotated. As a result, the engagement body 6 advances radially outward by the operation of the engagement / disengagement operation mechanism 27, and the distal end portion 6 a engages the receiving frame member 3, so that the closing lid 4 cannot be detached from the receiving frame member 3. .

  Therefore, the tool 36 is extracted from the shaft hole 32 of the bearing boss 28, and the closing member 40 is inserted into the shaft hole 32 instead. Then, the key 41 is inserted into the key insertion portion 43 of the closing member 40, and the locking mechanism is operated with the key 41. If the key 41 is removed after the operation, the person who does not have the key 41 can never take out the closing member 40 from the shaft hole 32. That is, since the tool 36 cannot be inserted into the shaft hole 28 by this, naturally the closing lid 4 cannot be taken out from the inside of the inspection port 2, and the inspection port 2 cannot be opened. As a result, the opening of the inspection port 2 by a third party can be prevented, and mischief and the like can be reliably prevented.

In such a state, the covering member 44 in the shaft hole 32 is covered with the cover cap 44, and the closing member 40 itself is hidden from view with the key insertion part 43 of the closing member 40 together. Thereafter, the upper lid 5 may be closed.
On the other hand, in order to open the inspection port 2, an operation substantially reverse to the above is performed. That is, the upper cover 5 is opened, the cover cap 44 is removed from the shaft hole 32, the locking mechanism of the closing member 40 is unlocked, the closing member 40 is removed from the shaft hole 32, and the operation portion (tool engagement) in the shaft hole 32 is removed. The engagement body 6 is retracted inward in the radial direction through the procedure of the operation of the recess 33) with the tool 36, and the distal end portion 6 a is disengaged from the engagement with the receiving frame member 3. Thus, for the first time, the closing lid 4 can be detached from the receiving frame member 3, so that the closing lid 4 can be taken out from the inspection port 2 and opened.

As is clear from this description, the lid member 4 can be opened only by a person who possesses both the key 41 and the tool 36.
6 to 9 show a second embodiment of the closure device 1 according to the present invention. The most different point of the closing device 1 of the second embodiment from the first embodiment described above is that the opening shape of the inspection port 2 is formed in a square shape (rectangular shape) and is matched to the opening shape of the inspection port 2. The closing lid 4 is also formed in a square shape (also rectangular). Other configurations and operational effects are basically the same as those in the first embodiment.

In the closing lid 4, the engaging body 6 and the engagement / disengagement operation mechanism 27 are arranged so as to be biased toward one side of the closing lid 4 in the longitudinal direction (upward in FIG. 7). Two sets of the engagement body 6 and the engagement / disengagement operation mechanism 27 may be provided by being distributed to both sides in the longitudinal direction. However, as described above, the structure is simplified, the weight is reduced, the cost is reduced, etc. It is illustrated.
As the engaging body 6 and the engaging / disengaging operation mechanism 27 are biased to one side in this way, on one side (the lower side in FIG. 7) on the opposite side, as is apparent from FIGS. In addition, an insertion hole 51 is provided in the outer peripheral side plate 4b of the closing lid 4, and a hook-shaped hook 52 is provided in the receiving frame member 3, so that the closing lid 4 can be prevented from being lifted by engagement by insertion.

The engagement state of both is not limited to this form, and a hook member having a U-shaped cross section may be provided on the lower surface and the periphery of the closing lid 4 so that the hook member engages with the receiving frame member 3.
Further, as the inspection port 2 and the closing lid 4 are made square, the receiving frame member 3 has four flat L shapes so that each one is assigned to each of the four corners of the inner wall 2a existing in the inspection port 2. One frame component 9 is provided. The frame constituent members 9 are not connected to each other, and are independently fixed to the inner wall 2 a of the inspection port 2. That is, the entire receiving frame member 3 does not have a closed ring shape (loop).

The four frame members 9 are provided with cut-and-raised pieces 55 for preventing the outer peripheral side plate 4b from being displaced from the outside with respect to the closing lid 4 supported by the upper portions thereof.
Instead of the cut-and-raised piece 55, as in the first embodiment, the horizontal portion 11 of the receiving frame member 3 is formed with a pin support hole 15 that is a long hole along the radial direction. In addition, the positioning pin 16 having the axial center directed in the vertical direction may be attached in a protruding state. Naturally, since the pin support hole 15 is a long hole, the positioning pin 16 is movable within the long diameter of the pin support hole 15, and the position of the closing lid 4 with respect to the opening shape of the inspection port 2 can be finely adjusted. It becomes possible.

As shown in FIG. 7, the closing lid 4 has a U-shaped notch 60 at the edge opposite to the position where the engagement / disengagement operation mechanism 27 is provided. The cutout portion 60 is for preventing the hinge portion 61 of the upper lid 5 and the closing lid 4 from interfering with each other when the upper lid 5 is opened and closed as necessary. It is not big enough to drop.
Further, in the receiving frame member 3 employed in the second embodiment, in order to prevent the closing lid 4 from falling into the inspection port 2, the two fall prevention rods 56 are hooked (two diagonal lines are connected). It was assumed that it was erected in a crossed X shape. The fall prevention bar 56 is structured not to be fixed to the receiving frame member 3, so that when the operator enters and exits the inspection port 2, it can be removed as appropriate.

Although such a fall prevention rod 56 may be one, it is preferable to use two or more to prevent the closure lid 4 from dropping. More preferably, three or more fall prevention rods 56 are used, and at least two of them are provided so that the other is crossed with the longitudinal direction of the opening.
In addition, the fall prevention rod 56 can be provided also when the inspection port 2 is circular opening as demonstrated in 1st Embodiment. For example, what is necessary is just to show as shown in FIG.10 and FIG.11.
The receiving frame member 3 shown in FIG. 10 and FIG. 11 has two frame components 9, which are not connected to each other, and are independently connected to the inner wall 2 a of the inspection port 2. It is fixed to. That is, the entire receiving frame member 3 does not have a closed ring shape (loop). Although this point is common to the second embodiment described above, there is no particular causal relationship between this and the provision of the fall prevention rod 56.

FIG. 12 shows a third embodiment of the closure device 1 according to the present invention.
In the present embodiment, the connecting link 30 is not rod-shaped but has a rhombus shape in plan view, and the others are substantially the same as in the first embodiment.
In this embodiment, even if the bearing boss 28 is rotated with a strong force and a strong deformation force is applied to the connecting link 30, the connecting link 30 having a rhombus is hardly deformed, and the engaging body 6 is closed with the closure lid. 4 can be reliably withdrawn / retracted in the radially outward direction, and a very strong engaging / disengaging operation mechanism 27 can be configured.

By the way, this invention is not limited to each above-mentioned embodiment, It can change suitably according to embodiment.
For example, the inspection port 2 may be used for sewers and water supply pipes, and the closing device 1 according to the present invention is not based on the assumption that the upper lid 5 is provided (used as an inner lid). It can be applied to itself.
The closing lid 4 may be, for example, an ellipse or a hexagon other than a circle or a rectangle.
Assuming that the bearing boss 28 of the engagement / disengagement operation mechanism 27 is not provided with the shaft hole 32, the closing member 40 may be stacked on the bearing boss 28.

FIG. 3 is an enlarged side sectional view showing the entire closure device at a portion corresponding to the line AA in FIG. 2. It is a top view of a closure lid adopted by a 1st embodiment of a closure device concerning the present invention. It is a top view of the receiving frame member shown corresponding to FIG. It is a BB line enlarged arrow line view of FIG. It is a perspective view of the locking operation mechanism employ | adopted in 1st Embodiment of the closure apparatus which concerns on this invention. It is the expanded side sectional view which showed the whole closure apparatus in the site | part corresponding to CC line of FIG. It is a top view of a closure lid adopted in a 2nd embodiment of a closure device concerning the present invention. It is a top view of the receiving frame member shown corresponding to FIG. It is an enlarged arrow line view corresponding to the DD line part and EE line part of FIG. It is the top view which showed the example which provided the fall prevention rod in the circular receiving frame member. It is an enlarged arrow line view corresponding to the FF line part and GG line part of FIG. It is a top view which shows 3rd Embodiment of the closure apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Closing device 2 Inspection port 2a Inner wall 3 Receiving frame member 4 Closing lid 6 Engagement body 16 Positioning pin 20 Lid position adjusting means 27 Engagement / disengagement operation mechanism 40 Closing member 41 Key 43 Key insertion part 44 Cover cap

Claims (5)

A receiving frame member (3) provided on the inner wall (2a) of the inspection port (2) leading to the underground structure, and a closing lid (4) supported by the receiving frame member (3) and closing the inspection port (2) Have
The closing lid (4) includes a plurality of engaging bodies (6) that can be engaged with and disengaged from the receiving frame member (3) under the closed condition of the inspection port (2), and an external operation from above the closing lid (4). An engagement / disengagement operation mechanism (27) for engaging / disengaging the engagement body (6), and the engagement / disengagement operation mechanism (27) are made attachable / detachable so as to block the upper portion of the engagement / disengagement operation mechanism (27) so as to be inoperable. A closing member (40) to be mounted is provided,
The inspection port closing device according to claim 1, wherein the closing member (40) is provided with a locking mechanism that can lock the attachment state to the engagement / disengagement operation mechanism (27) by operating the key (41) that can be inserted and removed.   The cover lid (4) is detachably provided with a cover cap (44) that covers the key insertion part (43) of the locking mechanism in a mounting state of the closing member (40). Item 1. The inspection port closing device according to Item 1.   The closing device for an inspection port according to claim 1 or 2, characterized in that the operating portion of the engagement / disengagement operation mechanism (27) in the closing lid (4) is positioned at the center of the closing lid (4). .   A positioning pin (16) for positioning the support position by engaging with the closing lid (4) is projected upward from the receiving frame member (3), and the positioning pin (16) is projected. The inspection port according to any one of claims 1 to 3, further comprising a lid position adjusting means (20) for adjusting a support position of the closing lid (4) by making the position variable. Closing device.   The opening shape of the inspection port (2) is formed in a square shape, and the closing lid (4) is also formed in a square shape in accordance with the opening shape of the inspection port (2). The inspection port closing device according to any one of?

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