Manhole cover structure

Abstract

To provide a manhole cover structure which is easy to use and open.SOLUTION: A receiving frame having a rectangular frame shape and having a tapered receiving portion forming an opening region serving as an entrance to the manhole, a lid body having a received portion received by the tapered receiving portion and capable of being in a closed state of closing the entire opening region and an open state of opening the opening region by being slid from the closed state, and a guide portion extending along a sliding direction of the lid body and slidably receiving the lid body in the sliding direction in the opening region, the lid body is configured such that, in a state where one end side in the sliding direction is lifted from the closed state, the other end portion in the sliding direction of the lid body is in contact with the sliding portion and the guided portion is in contact with the upper surface of the inclined portion.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a manhole cover structure for opening and closing a manhole. [Background technology]

[0002] As a manhole cover structure, for example, as disclosed in Patent Document 1, an inspection hatch covering device including a cover receiving frame and a covering cover is known.

[0003] A pair of guide rails are arranged on the inner sides of the opposing side walls of the lid receiving frame, and the shielding lid is provided with wheels that roll on the guide rails.

[0004] The pair of guide rails are inclined upward from the front end to the rear end.

[0005] Therefore, with the inspection hatch shielding device, the shielding lid can be pulled in one direction (one of the directions in which the shielding lid can slide) to move it away from above the lid receiving frame and open the manhole, and the shielding lid can be pushed in the other direction (the other direction in which the shielding lid can slide) to place it on top of the lid receiving frame and close the manhole. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2019-124015 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the above-mentioned inspection hatch shielding device was difficult to use because the manhole could only be opened by pulling the shielding cover in one direction. Therefore, it was desired to improve the ease of use of the inspection hatch shielding device, as well as the ease of opening and breaking.

[0008] In view of the above, an object of the present invention is to provide a manhole cover structure that is easy to use and open. [Means for solving the problem]

[0009] The manhole cover structure of the present invention comprises: A receiving frame having a rectangular frame shape and a tapered receiving portion configured so that an internal opening area becomes an entrance and exit for the manhole; a lid having a receiving portion that is received in the tapered receiving portion, the lid being capable of being put into a closed state in which the receiving portion is received in the tapered receiving portion to close the entire opening area, and an open state in which the lid is slid from the closed state to open at least a part of the opening area; a guide portion disposed within the opening region, the guide portion extending along a sliding direction in which the lid body is slid and receiving the lid body in a state in which the lid body is slidable in the sliding direction; The lid body has a guided portion that slides on the guide portion, The receiving frame has a pair of sliding portions aligned in the sliding direction, The guide portion is configured as an inclined portion in which both end portions in the sliding direction are inclined downward toward the tip, The lid body is configured so that when one end side in the sliding direction is lifted from the closed state, the other end side of the lid body in the sliding direction comes into contact with the sliding portion and the guided portion comes into contact with the upper surface of the inclined portion.

[0010] In the manhole cover structure of the above configuration, when the closed cover is opened to allow people to enter and exit the manhole, one end of the closed cover is lifted so that the other end of the cover in the sliding direction comes into contact with the sliding portion and the guided portion comes into contact with the upper surface of the inclined portion.

[0011] In this way, with the lid structure, the guided portion can be brought into contact with the upper surface of the inclined portion before the lid is released from the sliding portion, and as the lid continues to be pulled, the lid slides along the upper surface of the inclined portion and moves upward relative to the receiving frame. In this way, the lid retracts from the receiving frame and enters the open state, allowing people to enter and exit the manhole through the opening area of ​​the receiving frame.

[0012] In the manhole cover structure, both ends of the guide portion are configured as inclined portions, so that the cover body can be pulled to one side in the sliding direction to change from a closed state to an open state, and if the cover body is positioned in the opposite direction in the sliding direction, the cover body can be pulled to the other side in the sliding direction to change from a closed state to an open state.

[0013] Furthermore, when the closed lid body is slid on the guide portion, the guided portion can be brought into contact with the upper surface of the inclined portion before the other end of the lid body comes off the sliding portion, thereby reducing the force required to place the lid body on the upper surface of the inclined portion.

[0014] Therefore, the manhole cover structure is easy to use because the cover body can be changed from a closed state to an open state by pulling it to one side in the sliding direction, or from a closed state to an open state by pulling it to the other side.In addition, the force required to switch the cover body from a closed state to an open state can be reduced, making it both easy to use and easy to open.

[0015] The manhole cover structure of the present invention comprises: a fall prevention fence disposed within the receiving frame for preventing the lid body from falling from the opening region to a lower layer; A fence receiving portion formed in the receiving frame, the fence receiving portion configured to insert the fall prevention fence from above, The sliding portion may be provided on the fence receiving portion.

[0016] According to the manhole cover structure configured as described above, the fence receiving portion, which is the mounting location for the fall prevention fence, is designed to be less susceptible to damage, and the lid body is supported by the fence receiving portion until it comes into contact with the upper surface of the inclined portion when pulled, thereby preventing damage to the part of the lid body that receives the load.

[0017] Therefore, the manhole cover structure is also durable.

[0018] The manhole cover structure of the present invention also includes: the sliding portion has a sliding surface along which the other end of the lid body slides, The sliding surface may be formed flat from the start end to the end end in the direction of sliding movement.

[0019] According to the manhole cover structure having the above configuration, the force required to switch the cover body from a closed state to an open state can be further reduced. [Effects of the Invention]

[0020] As described above, the manhole cover structure of the present invention can achieve the excellent effect of being easy to use and open. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a plan view of a manhole cover structure according to one embodiment of the present invention. [Figure 2] FIG. 2 is an exploded view of the manhole cover structure according to the embodiment, and is a partial cross-sectional view taken along line II-II in FIG. [Figure 3] 3 is an exploded view of the manhole cover structure according to the embodiment, and is a partial cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a plan view of the manhole cover structure according to the embodiment with the cover removed. [Figure 5] In FIG. 5, (a) is a plan view of the fall prevention fence, and (b) is a side view of the fall prevention fence. [Figure 6] FIG. 6 is an enlarged plan view of the fence receiving portion in the manhole cover structure of the embodiment. [Figure 7] 7, (a) is a cross-sectional view taken along line AA in FIG. 6, and (b) is a cross-sectional view taken along line BB in FIG. [Figure 8] FIG. 8 is an explanatory diagram of the manhole cover structure according to the embodiment in use, with one end of the cover lifted up. [Figure 9] Figure 9 is an explanatory diagram of the manhole cover structure of the same embodiment in use, and is an explanatory diagram of the state when the pulling operation begins with one end of the cover in the lead and the guided portion comes into contact with the inclined portion. [Figure 10] FIG. 10 is an explanatory diagram of the manhole cover structure according to the embodiment in use, showing the guided portion sliding on the inclined portion. [Figure 11] FIG. 11 is an explanatory diagram of the manhole cover structure according to the embodiment in use, showing the guided portion sliding on the intermediate portion. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, a manhole cover structure (hereinafter referred to as the cover structure) according to one embodiment of the present invention will be described with reference to the accompanying drawings.

[0023] As shown in Figure 1, the lid structure 1 of this embodiment comprises a receiving frame 2 configured so that the internal opening area becomes an entrance and exit to the manhole, a lid body 3 that can be placed on top of the receiving frame 2 in an open state that covers the entire opening area, and a lid body 3 that can be retracted from above the receiving frame 2 and left at least a part of the opening area open, and as shown in Figures 2 and 3, a guide section 4 that is placed within the opening area and extends along the sliding direction in which the lid body 3 is slid and receives the lid body 3 in a state where it can slide in the sliding direction, a fall prevention fence 5 that is placed within the receiving frame 2 and prevents the lid body 3 from falling from the opening area to the lower level, and a fence receiving section 6 that is formed on the receiving frame 2 and is configured to allow the fall prevention fence 5 to be inserted from above.

[0024] As shown in Figure 4, the receiving frame 2 has a rectangular frame body 20 (specifically, a rectangular shape with rounded corners), a tapered receiving portion 21 formed around the entire inner surface of the frame body, and a protruding portion 22 (see Figure 5) that protrudes inward from the lower end of the tapered receiving portion 21.

[0025] The frame main body 20 has a pair of first frame side portions 200 aligned in the sliding direction, and a pair of second frame side portions 201 aligned in a direction perpendicular to the sliding direction (hereinafter referred to as the perpendicular direction).

[0026] The tapered receiving portion has a pair of first inclined portions 210 each formed on the inside of a different first frame side portion, and a pair of second inclined portions 211 each formed on the inside of a different second frame side portion.

[0027] In the tapered receiving portion, the pair of first inclined portions 210 and the pair of second inclined portions 211 face the opening region side. The pair of first inclined portions 210 and the pair of second inclined portions 211 are formed so as to be continuous with each other, thereby forming a rectangular frame shape (specifically, a rectangular shape with rounded corners).

[0028] The pair of first inclined portions 210 are inclined so that the lower ends are positioned more inward in the sliding direction than the upper ends (see FIG. 2).

[0029] The pair of second inclined portions 211 are inclined so that the lower ends are positioned more inward in the orthogonal direction than the upper ends (see FIG. 3).

[0030] The protruding portions 22 are formed on one first inclined portion 210 and on the other first inclined portion 210, respectively.

[0031] An upper surface 220 of one of the protruding portions 22 is a flat surface, and extends straight from the lower end of one of the first inclined portions 210 toward the inside in the sliding direction.

[0032] The upper surface of the other overhanging portion 22 is also a flat surface, and extends straight from the lower end of the other first inclined portion 210 toward the inside in the sliding direction.

[0033] As shown in Figure 2, the lid body 3 has a lid main body portion 30 for covering the opening area, a receiving portion 31 that is received in the tapered receiving portion, a slide operating portion 32 for sliding the lid main body portion 30, and a guided portion 33 that extends downward from the underside of the lid main body portion 30 and slides on the guide portion 4 (specifically, the upper surface of the guide portion 4).

[0034] The outer peripheral side surface of the lid main body 30 includes a pair of first outer side surfaces 300 facing outward in the sliding direction, and a pair of second outer side surfaces 301 (see FIG. 3) facing outward in the perpendicular direction.

[0035] The pair of first outer surfaces 300 are inclined so that the lower ends are positioned more inward in the sliding direction than the upper ends.

[0036] One of the pair of first outer side surfaces is a portion that is disposed so as to overlap one of the pair of first inclined portions 210. Therefore, the inclination angle of one of the pair of first outer side surfaces is set to match the inclination angle of one of the pair of first inclined portions 210.

[0037] The other of the pair of first outer side surfaces 300 is a portion that is disposed overlapping the other of the pair of first inclined portions 210. Therefore, the inclination angle of the other of the pair of first outer side surfaces 300 is set to match the inclination angle of the other of the pair of first inclined portions 210.

[0038] As shown in FIG. 3, the pair of second outer surfaces 301 are inclined so that the lower ends are positioned more inward than the upper ends in the orthogonal direction.

[0039] One of the pair of second outer side surfaces 301 is a portion that is disposed so as to overlap one of the pair of second inclined portions 211. Therefore, the inclination angle of one of the pair of second outer side surfaces 301 is set to match the inclination angle of one of the pair of second inclined portions 211.

[0040] The other of the pair of second outer side surfaces 301 is a portion that is disposed so as to overlap the other of the pair of second inclined portions 211. Therefore, the inclination angle of the other of the pair of second outer side surfaces 301 is set to match the inclination angle of the other of the pair of second inclined portions 211.

[0041] The received portion 31 has a pair of first received portions 310 (see FIG. 2) that are received on the first inclined portions 210, and a pair of second received portions 311 that are received on the second inclined portions 211.

[0042] In the receiving portion 31 of this embodiment, the first receiving portion 310 is constituted by the first outer surface 300 (see FIG. 2), and the second receiving portion 311 is constituted by the second outer surface 301.

[0043] The slide operation part 32 is provided on one end side in the sliding direction of the lid main body part 30. The slide operation part 32 is configured so that an operation tool used to operate the lid main body part 30 can be inserted into it, and the lid body 3 can be pulled or pushed using the operation tool inserted into the slide operation part 32.

[0044] The guided portion 33 is provided on the other end side in the sliding direction of the lid main body 30. The guided portion 33 has a guide base 330 extending downward from the bottom surface of the lid main body, and a guide roller 331 rotatably attached to the guide base 330.

[0045] As shown in FIG. 4, the guide portion 4 has both end portions 40 in the sliding direction and an intermediate portion 41 between the both end portions 40.

[0046] 2, each of the end portions 40 is configured as an inclined portion that slopes downward toward the tip in the sliding direction. Hereinafter, each end portion 40 of the guide portion 4 will be referred to as an inclined portion 40.

[0047] A space is formed between the tip of the inclined portion 40 and the protruding portion 22. This space is for arranging the guide roller 331 when the lid body 3 is placed on the receiving frame 2 and completely covers the opening area.

[0048] The guide roller 331 disposed in this space is in a state of not contacting the inclined portion 40.

[0049] The intermediate portion 41 between the pair of end portions is not inclined in the vertical direction, but extends straight along the sliding direction.

[0050] The lid structure 1 of this embodiment includes a pair of guide portions 4. One of the pair of guide portions 4 is fixed to the inside of one second frame side portion 201, and the other of the pair of guide portions 4 is fixed to the inside of the other second frame side portion 201 (see FIG. 4).

[0051] As shown in Figs. 5(a) and 5(b), the fall prevention fence 5 has a plurality of horizontal bars 50 extending along the sliding direction and a plurality of vertical bars 51 extending along the perpendicular direction.

[0052] The fall prevention fence 5 of this embodiment is configured to have three horizontal bar portions 50, and two of the three horizontal bar portions 50 are configured to have attachment portions to the fence receiving portion 6.

[0053] As shown in Figure 5(b), the horizontal bar portion 50 having an attachment portion to the fence receiving portion 6 has a joinable portion 500 extending along the sliding direction, to which the vertical bar portion 51 is joined, and attachment portions 501 each extending from separate ends of the joinable portion 500, which serve as attachment portions to the fence receiving portion 6.

[0054] The mounting portion 501 has a tip upper portion 5010 that extends outward and upward in the sliding direction from the end of the joined portion 500, a top portion 5011 that extends outward from the tip upper portion 5010 along the sliding direction, and an insertion / removal portion 5012 that extends downward from the tip of the top portion 5011 and can be inserted into and removed from an insertion hole 60 (described later) of the fence receiving portion 6.

[0055] The horizontal beam portion 50, which does not have an attachment portion to the fence receiving portion 6, is composed of only the to-be-joined portion 500 of the above-mentioned to-be-joined portion 500 and attachment portion 501.

[0056] The vertical beam portions 51 are joined to the respective joined portions 500 of the horizontal beam portions 50. As a result, the horizontal beam portions 50 and the vertical beam portions 51 are integrated.

[0057] As shown in FIG. 6, 7(a) and 7(b), the fence receiving portion 6 is formed with an insertion hole 60 that opens upward.

[0058] In addition, the fence receiving portion 6 of this embodiment has a base 61 that extends inward from the protruding portion 22 in the sliding direction and has an upper surface 610 that is flush with the upper surface 220 of the protruding portion 22, and a receiving portion 62 that supports the mounting portion 501 of the cross bar portion 50.

[0059] In the lid structure 1 of this embodiment, a flat surface without any steps is formed from the lower end of the first inclined portion 210 to the upper surface 610 of the base 61. In the lid structure 1 of this embodiment, the base 61 forms a sliding portion, and the upper surface of the sliding portion is the upper surface 610 of the base 61.

[0060] The lid structure 1 of this embodiment is configured so that when one end of the lid body 3 in the sliding direction is pulled up, the bottom surface of the other end of the lid main body 30 comes into contact with the upper surface 610 of the base 61.

[0061] In addition, the lid structure 1 is configured so that when one end of the lid body 3 in the closed state is lifted and pulled along the sliding direction, the bottom surface of the other end of the lid main body portion 30 comes into contact with the upper surface of the inclined portion 40 while sliding along the upper surface 610 of the base portion 61.

[0062] An upper surface 610 of the base 61 is positioned higher than an upper surface 620 of the receiving portion 62. The distance from the upper surface 620 of the receiving portion 62 to the upper surface 610 of the base 61 in the vertical direction is set to be larger than the outer diameter of the top portion 5011.

[0063] As a result, when the insertion / removal portion 5012 is inserted into the insertion hole 60 and the top portion 5011 is received by the upper surface 620 of the receiving portion 62, the fence receiving portion 6 is configured so that the top portion 5011 does not protrude above the upper surface 620 of the receiving portion 62.

[0064] In the lid structure 1 of this embodiment, two fence receiving portions 6 are provided for each of the one protruding portion 22 and the other protruding portion 22. If a pair of fence receiving portions 6 facing each other in the sliding direction is considered to be one set, then the lid structure 1 of this embodiment has two sets of protruding portions 22.

[0065] The configuration of the lid structure 1 according to this embodiment is as described above. Next, how to use the lid structure 1 will be described.

[0066] In the lid structure 1, the manhole is opened and closed by moving the lid body 3 in the sliding direction.

[0067] When opening the manhole, one end of the closed lid body 3 is pulled up to tilt the lid body 3, and the lid body 3 is pulled to one side in the sliding direction to retract it from above the receiving frame 2.

[0068] To lift up one end of the lid body 3, an operating tool T is inserted into the slide operating portion 32 and the operating tool T is operated to lift up one end of the lid body 3.

[0069] When one end of the lid body 3 is pulled up, the bottom surface of the other end of the lid main body 30 comes into contact with the upper surface 610 of the base 61, which is the sliding portion (see FIG. 8).

[0070] In this state, when the lid body 3 is pulled to one side in the sliding direction, the lid body 3 slides on the fence receiving portion 6 and moves in the direction in which it is being pulled, and as the lid body 3 slides on the fence receiving portion 6, the guided portion 33 comes into contact with the upper surface of the inclined portion 40 (see Figure 9).

[0071] Then, when the lid body 3 continues to be pulled, the lid body 3 moves on the inclined portion 40 and moves upward relative to the receiving frame 2 (see FIG. 10).

[0072] If the lid body 3 is further pulled and operated, the lid body 3 moves over the intermediate portion 41, and the opening area of ​​the receiving frame 2 is opened sufficiently, allowing a person to pass through the manhole.

[0073] When closing the manhole, one end of the closed lid body 3 is pulled up again to tilt the lid body 3, and the lid body 3 is pushed to the other side in the sliding direction to be stacked on the receiving frame 2.

[0074] When the lid body 3 is pushed to the other side in the sliding direction, the lid body 3 slides on the middle part of the fence receiving part 6 and moves in the pushing direction, and when it moves from the middle part to the inclined part 40, it moves downward in the pushing direction and transfers onto the lid body 3 before coming off the inclined part 40. Then, the entire lid body 3 is placed on top of the receiving frame 2.

[0075] In this way, the cover body 3 can be closed to prevent people from passing through the manhole through the opening area of ​​the receiving frame 2.

[0076] In addition, although Figures 8 to 11 explain that the opening area is opened by pulling the lid body 3 to the right, if the lid body 3 is placed on the receiving frame 2 with the sliding direction facing in the opposite direction, the opening area can also be opened by pulling the lid body 3 to the right.

[0077] In this way, the lid structure 1 of this embodiment is designed so that the opening area can be opened by pulling the lid body 3 to one side in the sliding direction, or by pulling the lid body 3 to the other side in the sliding direction.

[0078] As described above, with the lid structure 1 according to this embodiment, when one end of the lid body 3 in the closed state is lifted and then the lid body 3 is pulled in the sliding direction starting from that end, the lid body 3 slides on the sliding portion (in this embodiment, the base 61 of the fence receiving portion 6), and before it comes off the sliding portion, the guided portion 33 comes into contact with the upper surface of the inclined portion 40 of the guide portion 4. Then, as the lid body 3 continues to be pulled, it moves upward relative to the receiving frame 2 while sliding on the upper surface of the inclined portion 40, and as the lid body 3 continues to be pulled further, the opening area of ​​the receiving frame 2 opens, allowing a person to pass through the manhole.

[0079] In the lid structure 1 used in this manner, both ends of the guide portion 4 are configured as inclined portions 40, so that the lid body 3 can be pulled to one side in the sliding direction to change from a closed state to an open state, and if the lid body 3 is turned in the opposite direction in the sliding direction, the lid body 3 can be pulled to the other side in the sliding direction to change from a closed state to an open state.

[0080] Furthermore, when the lid body 3 is closed and pulled in the sliding direction, the other end portion starts to slide along the sliding portion, and the guided portion 33 comes into contact with the upper surface of the inclined portion 40 before the other end portion comes off the sliding portion, so that the force required to place the lid body 3 on the upper surface of the inclined portion 40 can be reduced.

[0081] Therefore, the manhole cover structure 1 is easy to use because the cover body 3 can be changed from a closed state to an open state by pulling it to one side in the sliding direction, or from a closed state to an open state by pulling it to the other side.In addition, the force required to switch the cover body 3 from a closed state to an open state can be reduced, making it both easy to use and easy to open.

[0082] In this way, the lid structure 1 can provide the excellent effect of being easy to use and open.

[0083] Furthermore, in the lid structure 1 of the above embodiment, the fence receiving portion 6, where the fall prevention fence 5 is attached, is configured to be less susceptible to breakage, and a sliding portion is formed on this fence receiving portion 6. Therefore, from the time the lid body 3 begins to be pulled until it comes into contact with the upper surface of the inclined portion 40, the lid body 3 is supported by the fence receiving portion 6, which prevents the portion of the lid body 3 that receives the load from being broken.

[0084] In this way, the lid structure 1 of the above embodiment is also break-resistant.

[0085] Furthermore, the sliding surface of the sliding portion is formed flat from the start to the end in the direction of sliding movement of the lid body 3 (from one end to the other end in the sliding direction), so the force required to switch the lid body 3 from a closed state to an open state is further reduced.

[0086] It should be noted that the cover structure for the cover manhole according to the present invention is not limited to the above embodiment, and various modifications can of course be made within the scope that does not deviate from the gist of the present invention.

[0087] The guide portion 4 in the above embodiment is configured by a pair of guide portions 4 (specifically, a guide portion 4 fixed to the inside of one second frame side portion 201 and a guide portion 4 fixed to the inside of the other second frame side portion 201), but is not limited to this configuration. For example, the guide portion 4 may be provided on the fall prevention fence 5.

[0088] In this case, the guide portion 4 may be attached to the fall prevention fence 5 later, or may be configured as a part of the fall prevention fence 5.

[0089] Furthermore, as long as the lid structure 1 is configured to be able to receive the lid body 3 in a state where it can slide in the sliding direction, the fall prevention fence 5 may be provided with one guide portion 4, or the fall prevention fence 5 may be provided with multiple guide portions 4.

[0090] Furthermore, the lid structure 1 may be configured to have a guide portion 4 fixed to the inside of one of the second frame side portions 201, or a guide portion 4 fixed to the inside of the other second frame side portion 201, and a guide portion 4 provided on the fall prevention fence 5.

[0091] In the lid structure 1 of the above embodiment, the sliding portion is formed by a part of the fence receiving portion 6, but the sliding portion may be formed in a location separate from the fence receiving portion 6. As long as the upper surface of the sliding portion and the upper surface 220 of the protruding portion 22 are continuous and are positioned on the same plane (as long as there is no step at the boundary between the upper surface of the sliding portion and the upper surface 220 of the protruding portion 22), the sliding portion may be connected to the protruding portion 22, for example, or to the fall prevention fence 5 (for example, the top 5011).

[0092] In the lid structure 1 of the above embodiment, two fence receiving portions 6 are provided for each of the one overhanging portion 22 and the other overhanging portion 22, but this configuration is not limited to this. For example, three or more fence receiving portions 6 may be provided for each of the one overhanging portion 22 and the other overhanging portion 22.

[0093] In other words, in the above embodiment, the lid structure 1 is configured to have two sets of protrusions 22, with a pair of fence receiving portions 6 facing each other in the sliding direction as one set, but it may also be configured to have three or more sets of protrusions 22.

[0094] The lid structure 1 of the above embodiment is configured such that, after one end of the lid body 3 in the closed state is pulled up to tilt the lid body 3, the other end of the lid body 3 (the other end in the sliding direction) comes into contact with the sliding portion and the guided portion 33 comes into contact with the upper surface of the inclined portion 210 by pulling the lid body 3 to one side in the sliding direction, but is not limited to this configuration. The lid structure 1 may be configured such that, for example, the other end of the lid body 3 (the other end in the sliding direction) comes into contact with the sliding portion and the guided portion 33 comes into contact with the upper surface of the inclined portion 210 at the time when one end of the lid body 3 in the closed state is pulled up to tilt the lid body 3 (the time before the lid body 3 is pulled to one side in the sliding direction). [Explanation of symbols]

[0095] 1...lid structure, 2...receiving frame, 3...lid body, 4...guide portion, 5...fall prevention fence, 6...fence receiving portion, 20...frame main body portion, 21...tapered receiving portion, 22...extending portion, 30...lid main body portion, 31...receiving portion, 32...slide operation portion, 33...guided portion, 40...inclined portion, 41...middle portion, 50...horizontal beam portion, 51...vertical beam portion, 60...insertion hole, 61...base portion, 62...receiving portion, 200...first frame side portion, 20 1...Second frame side part, 210...First inclined part, 211...Second inclined part, 220...Top surface, 300...First outer surface, 301...Second outer surface, 310...First receiving part, 311...Second receiving part, 330... Guide base, 331...Guide roller, 500...Joined part, 501...Mounting part, 610...Top surface, 620...Top surface, 5010...Top top, 5011...Top part, 5012...Insertion / extraction part, T...Operation tool

Claims

1. A receiving frame having a rectangular frame shape and a tapered receiving portion configured so that an internal opening area becomes an entrance and exit for the manhole; a lid having a receiving portion that is received in the tapered receiving portion, the lid being capable of being put into a closed state in which the receiving portion is received in the tapered receiving portion to close the entire opening area, and an open state in which the lid is slid from the closed state to open at least a part of the opening area; a guide portion disposed within the opening region, the guide portion extending along a sliding direction in which the lid body is slid and receiving the lid body in a state in which the lid body is slidable in the sliding direction; The lid body has a guided portion that slides on the guide portion, The receiving frame has a pair of sliding portions aligned in the sliding direction, The guide portion is configured as an inclined portion in which both end portions in the sliding direction are inclined downward toward the tip, The lid body is configured so that, when one end side in the sliding direction is lifted from the closed state, the other end side of the lid body in the sliding direction comes into contact with the sliding portion, and the guided portion comes into contact with the upper surface of the inclined portion. Manhole cover structure.

2. a fall prevention fence disposed within the receiving frame for preventing the lid body from falling from the opening region to a lower layer; A fence receiving portion formed in the receiving frame, the fence receiving portion configured to insert the fall prevention fence from above, The sliding portion is provided on the fence receiving portion, The manhole cover structure according to claim 1.

3. the sliding portion has a sliding surface along which the other end of the lid body slides, The sliding surface is formed flat from the start end to the end end in the moving direction of the sliding movement. A manhole cover structure according to claim 1 or 2.

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