Manhole cover connection structure and manhole cover installation method

Abstract

To provide a connection structure of a basin cover capable of appropriately coping with a case where a ground surface of an installation site is a slope.SOLUTION: A connection structure 100 of a basin cover includes a riser pipe 104, a basin cover 10, and a temporary fixing member (a foaming tape 18). The basin cover comprises: a receiving frame 12 having an upper cover storage portion 20 and a socket 22 and an upper cover 14 having a recessed portion 40 into which a decorative material 106 is fitted on an upper surface. An inner diameter of the socket is set larger than an outer diameter of the riser pipe. The temporary fixing member provided between an outer surface of the riser pipe and an inner surface of the socket makes it possible to temporarily fix the socket to the riser pipe in a tilted state.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a connection structure of a well lid and a construction method of a well lid. In particular, for example, it relates to a connection structure of a well lid for connecting a well lid provided with a decorative material on the upper surface to a riser pipe of a well, and a construction method of a well lid.

Background Art

[0002] An example of a conventional well lid is disclosed in Patent Document 1. The well lid of Patent Document 1 has a protruding portion on the inner surface of the lower part, a synthetic resin receiving frame whose lower part is fitted to the upper end part of the riser pipe, a recessed portion on the upper surface into which a decorative material is fitted, and is detachably provided on the upper part of the receiving frame. It includes a synthetic resin upper lid, a synthetic resin inner lid provided below the upper lid and detachably held inside the receiving frame by being locked to the protruding portion, and a sealing ring provided on the outer surface of the inner lid.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a well lid provided with a decorative material on the upper surface, it is necessary to make the upper surface of the decorative material provided on the well lid flush with the upper surfaces of the surrounding decorative materials. On the other hand, the ground surface (road surface) at the installation location of the well lid may not only be a horizontal plane but also an inclined surface with a water gradient or the like. Therefore, there are cases where the receiving frame of the well lid has to be connected to the upper end part of the riser pipe in an inclined state.

[0005] However, in the technology described in Patent Document 1, the upper end of the riser pipe and the receiving opening formed at the bottom of the receiving frame are connected (adhesively bonded) using an adhesive, making it difficult to install the receiving frame (and consequently the manhole cover) at an angle relative to the riser pipe. Furthermore, once the adhesive bonding is completed, it is not possible to fine-tune the position of the receiving frame afterward, which is inconvenient, and further improvements in workability are needed.

[0006] Therefore, the main objective of this invention is to provide a novel connection structure for manhole covers and a method for constructing manhole covers.

[0007] Another object of this invention is to provide a manhole cover connection structure and a manhole cover installation method that can appropriately handle cases where the ground surface at the installation site is sloped. [Means for solving the problem]

[0008] The first invention is a manhole cover connection structure for connecting a manhole cover, which has a decorative material on its upper surface, to a riser pipe of a manhole, wherein the manhole cover comprises a receiving frame having an upper cover housing portion and a receiving opening formed on the lower side of the upper cover housing portion and connected to the upper end of the riser pipe, and an upper cover having a recess on its upper surface into which a decorative material is fitted, and which is detachably held in the upper cover housing portion, wherein the inner diameter of the receiving opening is set to be larger than the outer diameter of the riser pipe, and a temporary fixing member is provided in the gap between the outer surface of the upper end of the riser pipe and the inner surface of the receiving opening, which can temporarily fix the receiving frame in an inclined state relative to the riser pipe. The inner surface of the socket is formed in a tapered shape, widening in diameter from the back to the tip of the socket. This is the connection structure for the manhole cover.

[0009] In the first invention, the manhole cover connection structure includes a riser pipe, a manhole cover comprising a receiving frame and an upper cover, and a temporary fixing member. The receiving frame has an upper cover receiving section for housing the upper cover, and a receiving opening formed on the lower side of the upper cover receiving section and connected to the upper end of the riser pipe. The upper cover also has a recess on its upper surface into which a decorative material is fitted, and is detachably held in place of the upper cover receiving section. The inner diameter of the receiving opening is set to be larger than the outer diameter of the riser pipe, and a temporary fixing member such as foam tape is provided in the gap between the outer surface of the upper end of the riser pipe and the inner surface of the receiving opening, which allows the receiving frame to be temporarily fixed in an inclined position relative to the riser pipe. Furthermore, the inner surface of the socket is tapered, widening in diameter from the back to the tip.

[0010] According to the first invention, the receiving frame can be temporarily fixed in an inclined position relative to the rising pipe by a temporary fixing member provided in the gap between the outer surface of the upper end of the rising pipe and the inner surface of the receiving opening, so that it can be appropriately adapted even when the ground surface at the installation site is sloped. Furthermore, even after the manhole cover has been temporarily fixed, the height position and inclination angle of the receiving frame can be finely adjusted, improving the ease of installation of the manhole cover. Furthermore, since the inner surface of the receiving opening is tapered, the receiving frame can be stably and firmly temporarily fixed with the temporary fixing member.

[0011] The second invention is dependent on the first invention, and the temporary fixing member is compressed between the outer surface of the upper end of the riser pipe and the inner surface of the receiving opening, thereby temporarily fixing the receiving frame in an inclined state relative to the riser pipe.

[0012] The third invention is dependent on the first or second invention and includes an inner lid that has a fitting portion fitted to the upper end of the riser pipe and seals the upper end opening of the riser pipe.

[0013] According to the third invention, rainwater intrusion into the manhole and odor leakage from the riser pipe to the outside are properly prevented.

[0016] The 4 The invention is The first or second In accordance with the invention, the size of the gap between the inner part of the socket where the temporary fixing member is placed and the riser pipe is smaller than the thickness of the temporary fixing member in the state before the riser pipe and the socket are connected, and the size of the gap between the outer part of the socket and the riser pipe is larger than the thickness of the temporary fixing member in the state before the riser pipe and the socket are connected.

[0017] The 4 According to this invention, it becomes easier to insert the riser pipe into the socket, thus simplifying the construction of the receiving frame.

[0018] The 5The invention relates to a method for installing a manhole cover with a decorative material on its upper surface in a construction site where the ground surface is sloped, comprising the steps of: (a) preparing a manhole cover comprising a receiving frame having an upper cover housing section and a receiving opening formed on the lower side of the upper cover housing section, and an upper cover having a recess on its upper surface into which a decorative material is fitted, and which is detachably held in the upper cover housing section, wherein the inner diameter of the receiving opening is larger than the outer diameter of the riser pipe of the manhole; (b) installing the manhole in the ground so that the upper end of the riser pipe is exposed; and (c) the upper end of the riser pipe The method for installing a manhole cover includes the steps of: (d) connecting the receiving opening of the receiving frame to the end and temporarily fixing the receiving frame at an angle to the riser pipe so that when the decorative material is installed the upper surface of the decorative material provided on the manhole cover and the upper surface of the decorative material provided around the receiving frame are flush; (f) attaching the top cover to the top cover housing portion of the receiving frame; (e) fixing the receiving frame by applying mortar or concrete around the receiving frame; and (f) installing decorative material in the recessed portion of the top cover and around the receiving frame.

[0019] The 5 According to this invention, even if the ground surface at the installation site is sloped, the manhole cover can be properly installed according to the slope.

[0020] The 6 The invention is the first 5 The invention is dependent on the present invention, and in step (c), a temporary fixing member is attached to the outer surface of the upper end of the riser pipe, and the temporary fixing member is compressed between the outer surface of the upper end of the riser pipe and the inner surface of the receiving opening, thereby temporarily fixing the receiving frame in an inclined position relative to the riser pipe. [Effects of the Invention]

[0021] According to this invention, the receiving frame can be temporarily fixed in an inclined position relative to the rising pipe by a temporary fixing member provided in the gap between the outer surface of the upper end of the rising pipe and the inner surface of the receiving opening, thus enabling appropriate handling even when the ground surface at the installation site is sloped. Furthermore, even after the manhole cover has been temporarily fixed, the height position and inclination angle of the receiving frame can be finely adjusted, improving the ease of installation of the manhole cover.

[0022] The above objects, other objects, features, and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

Brief Description of the Drawings

[0023] [Figure 1] It is a view showing a state where the connection structure of the rice paddy lid, which is an embodiment of the present invention, is constructed. [Figure 2] It is a cross-sectional view showing the connection structure of the rice paddy lid in a state where the receiving frame is horizontally temporarily fixed. [Figure 3] It is a cross-sectional view showing the connection structure of the rice paddy lid in a state where the receiving frame is tilted and temporarily fixed. [Figure 4] It is a cross-sectional view showing the rice paddy lid. [Figure 5] It is a front view showing the receiving frame. [Figure 6] It is a cross-sectional view showing the receiving frame. [Figure 7] It is a perspective view showing the upper lid. [Figure 8] It is a cross-sectional view showing the upper lid. [Figure 9] It is a perspective view showing the inner lid. [Figure 10] It is a cross-sectional view showing the inner lid. [Figure 11] It is a perspective view showing a state where a foaming tape is attached to the rising pipe. [Figure 12] It is a view showing a part of the construction method of the rice paddy lid. [Figure 13] It is a view showing another part of the construction method of the rice paddy lid. [Figure 14] It is a view showing another example of the rice paddy lid and the decorative material provided around it.

Modes for Carrying Out the Invention

[0024] Referring to Figure 1, one embodiment of this invention, a manhole cover connection structure 100 (hereinafter simply referred to as "connection structure 100"), connects a manhole cover 10 to the upper end of a riser pipe 104 of a manhole 102, such as a sewage manhole or rainwater manhole, installed on the site of a building such as a detached house, apartment, or condominium. This manhole cover 10 is a decorative cover that can be fitted onto its upper surface with decorative materials 108 similar to the surrounding decorative materials (paving materials) 106, such as interlocking blocks, tiles, stone, concrete (stamped concrete, etc.), and grass.

[0025] As shown in Figures 2 and 3, the connection structure 100 includes a riser pipe 104, a manhole cover 10 comprising a receiving frame 12 and an upper cover 14, an inner cover 16, and foam tape 18, which is an example of a temporary fixing member. As will be described in detail later, this connection structure 100 allows for temporary fixing of the receiving frame 12 of the manhole cover 10 in an inclined position relative to the riser pipe 104, and is suitable for installation locations where the ground surface (road surface) is an inclined surface with a water gradient. The inner diameter of the riser pipe 104 to which this connection structure 100 (or manhole cover 10) is applied is, for example, 75-300 mm. In this embodiment, the following explanation will be given assuming a connection structure 100 applied to a riser pipe 104 with an inner diameter of 200 mm.

[0026] As shown in Figure 4, the manhole cover 10 comprises a receiving frame 12 connected to the upper end of the riser pipe 104, and an upper cover 14 that is detachably attached to the receiving frame 12. The receiving frame 12 and the upper cover 14 are each made of a synthetic resin such as rigid polyvinyl chloride.

[0027] As shown in Figures 5 and 6, the receiving frame 12 comprises a cylindrical top lid housing section 20 formed at the top and a receiving opening 22 formed on the lower side of the top lid housing section 20. The top lid housing section 20 is the part that houses the top lid 14, and the receiving opening 22 is the connection part with the riser pipe 104. The connecting part between the top lid housing section 20 and the receiving opening 22 is tapered in a stepped manner toward the receiving opening 22 side, and the upper surface of this annular stepped section is used as a top lid support section 20a that locks onto the lower surface of the top lid 14. The inner diameter of the top lid housing section 20 is, for example, 270 mm, and the height (vertical length) of the top lid housing section 20 is, for example, 85 mm.

[0028] The inner diameter of the socket 22 is set to be larger than the outer diameter of the riser pipe 104 (for example, 216 mm), and a gap 24 of a predetermined interval is formed between the outer surface of the riser pipe 104 and the inner surface of the socket 22 (see Figure 2). In addition, the inner surface of the socket 22 is formed in a tapered shape that expands in diameter from the back to the front of the socket 22. In this embodiment, the inner surface of the socket 22 has a first tapered surface 22a formed at the upper (back) position corresponding to the foam tape 18 described later, and a second tapered surface 22b formed at the lower (front) side, and is formed in a tapered shape that expands in diameter in stages. The inner diameter of the socket 22 is, for example, 228 mm at the upper end of the first tapered surface 22a (back of the socket 22) and for example, 235 mm at the lower end of the second tapered surface 22b (front of the socket 22). Furthermore, the height (vertical length) of the receiving opening 22 is set small, for example, 50 mm, to make it easier to tilt the receiving frame 12 relative to the riser pipe 104 (to allow for a larger tilt).

[0029] Furthermore, an annular flange portion 26 is formed at the connection between the upper lid housing portion 20 and the receiving opening 22, extending outward. In addition, the upper lid housing portion 20 has a plurality of triangular plate-shaped first ribs 28 arranged at predetermined intervals in the circumferential direction to connect its outer surface with the upper surface of the flange portion 26. Furthermore, the receiving opening 22 has a plurality of triangular plate-shaped second ribs 30 arranged at predetermined intervals in the circumferential direction to connect its outer surface with the lower surface of the flange portion 26. The receiving frame 12 is reinforced by these flange portion 26, first ribs 28 and second ribs 30.

[0030] As shown in Figures 7 and 8, the top cover 14 is formed in a bottomed cylindrical shape with a recess (decorative material storage section) 40 on its upper surface into which a decorative material 108 can be fitted. Specifically, the top cover 14 has a short cylindrical side wall 42 and a disc-shaped bottom wall 44 that seals the lower end of the side wall 42. Two recesses 46 are formed in the side wall 42, which are recessed inward and extend in a rectangular groove shape in the vertical direction, facing each other. A jig hole 48 and a hook portion 50 are formed at the upper ends of these recesses 46. The jig hole 48 is used to insert a jig (not shown) for attaching and detaching the top cover 14, such as a crowbar, peppermint, or special tool with a hook at its tip. By hooking the tip of the jig inserted through the jig hole 48 onto the hook portion 50, the top cover 14 can be easily attached and detached. The specific details of the jig hole 48, such as its position and shape, can be changed as appropriate. The jig hole 48 only needs to be such that a jig can be inserted and the top cover 14 can be attached and detached.

[0031] Furthermore, a bottom rib 52 is formed on the lower surface of the bottom wall 44, consisting of multiple circular ribs arranged concentrically and multiple straight ribs arranged radially. This bottom rib 52 reinforces the top cover 14. In addition, multiple drainage holes 54 are formed in the bottom wall 44 at positions that do not overlap with the bottom rib 52. These drainage holes 54 prevent rainwater and other liquids from accumulating in the recessed area 40.

[0032] As described above, the top lid 14 is held within the top lid housing 20 of the receiving frame 12 by being locked to the top lid support portion 20a. The height of the top lid 14 is set to be the same as the height of the top lid housing 20 of the receiving frame 12, so that when the top lid 14 is attached to the receiving frame 12, the upper end surface of the side wall 42 and the upper end surface of the top lid housing 20 are flush. The inner diameter of the side wall 42 (the diameter of the recess 40) is, for example, 260 mm, and the outer diameter of the side wall 42 is set to be the same as or slightly smaller than the inner diameter of the top lid housing 20. Furthermore, the depth of the recess 40 is set considering the thickness of a typical interlocking block, for example, 65 mm.

[0033] As shown in Figures 9 and 10, the inner lid 16 is a component that seals the upper end opening of the riser pipe 104 to prevent leakage of foul odors and wastewater from the riser pipe 104 to the outside, and is made of a synthetic resin such as rigid polyvinyl chloride. The inner lid 16 has a circular top plate portion 60 and a short cylindrical fitting portion 62 formed along the lower peripheral edge of the top plate portion 60. The top plate portion 60 has a recess 60a in its center, and a grip portion (handle) 64 is formed so as to span this recess 60a. Having such a grip portion 64 makes it easy to attach and detach the inner lid 16. In addition, by forming the grip portion 64 in the recess 60a, the height dimension of the inner lid 16 (and by extension the receiving frame 12) can be reduced.

[0034] Furthermore, an annular groove 66 extending in the circumferential direction is formed on the outer surface of the inner lid 16, specifically on the outer surface of the fitting portion 62, and a seal ring 68 is fitted into this groove 66. The inner lid 16 is held on the riser pipe 104 by the fitting portion 62 being fitted into the upper end of the riser pipe 104 and the lower peripheral edge of the top plate portion 60 being locked to the upper end surface of the riser pipe 104.

[0035] Returning to Figures 2 and 3, an annular foam tape 18 (temporary fixing member) is provided in a compressed state in the gap 24 between the outer surface of the upper end of the riser pipe 104 and the inner surface of the receiving opening 22 of the receiving frame 12, so as to fill this gap 24. The foam tape 18 may be a strip-shaped foam resin with an adhesive layer formed on one side, having a predetermined thickness. Examples of foam resins that make up the foam tape 18 include polyolefin-based or polyurethane-based foam resins.

[0036] As can be clearly seen in Figure 11, the foam tape 18 is attached in an annular shape to the outer surface of the upper end of the riser pipe 104 before connecting the riser pipe 104 to the receiving opening 22 of the receiving frame 12. The foam tape 18 then supports the receiving frame 12 so that it can swivel, that is, tilt relative to the riser pipe 104, when the receiving frame 12 (manhole cover 10) is connected to the riser pipe 104. A notch 18a may be formed in a part of the circumferential direction of the foam tape 18. In other words, the foam tape 18 may be formed in an annular shape with a notch 18a in a part of the circumferential direction, and this notch 18a is used as a drainage groove for water accumulated on the upper surface of the inner cover 16.

[0037] Furthermore, as described above, the inner surface of the receiving opening 22 of the receiving frame 12 is formed in a tapered shape that widens from the back to the front of the receiving opening 22. In other words, the size of the gap 24 between the riser pipe 104 and the receiving opening 22 is larger at the front (inlet) side of the receiving opening 22 than at the back side. Here, the size of the gap 24 between the back portion of the receiving opening 22 where the foam tape 18 is placed (specifically, the portion of the first tapered surface 22a) and the riser pipe 104 is set to be smaller than the thickness of the foam tape 18 in the state before the riser pipe 104 and the receiving opening 22 are connected (i.e., the thickness in its natural state). On the other hand, the size of the gap 24 between the front portion of the receiving opening 22 and the riser pipe 104 is set to be larger than the thickness of the foam tape 18 in the state before the riser pipe 104 and the receiving opening 22 are connected. In other words, when the foam tape 18 is attached to the upper end of the riser pipe 104, the outer diameter of the foam tape 18 is larger than the inner diameter of the rear part of the socket 22 and smaller than the inner diameter of the front part of the socket 22. Specifically, the thickness of the foam tape 18 is set to, for example, 4 mm to 10 mm. In this embodiment, the gap 24 at the rear part of the socket 22 is about 6 mm, and the gap 24 at the front part of the socket 22 is about 9.5 mm, and the thickness of the foam tape 18 is, for example, 8 mm.

[0038] In this connection structure 100, as shown in Figures 2 and 3, the receiving frame 12 (and by extension, the manhole cover 10) is supported by the foam tape 18, and the receiving frame 12 is free from the riser pipe 104. Therefore, when installing the manhole cover 10, the receiving frame 12 can be supported (temporarily fixed) at an angle to the riser pipe 104. In other words, the foam tape 18 can temporarily fix the receiving frame 12 at an angle to the riser pipe 104, and the foam tape 18 is compressed between the outer surface of the upper end of the riser pipe 104 and the inner surface of the receiving opening 22, thereby temporarily fixing the receiving frame 12 at an angle to the riser pipe 104. In this embodiment, the upper end surface of the receiving frame 12 (and by extension, the upper surface of the decorative material 106) can take any inclination of up to 3 degrees with respect to the direction perpendicular to the axial direction of the riser pipe 104 (i.e., the horizontal direction). Furthermore, since it is only temporarily fixed with foam tape 18, the height position and inclination angle of the receiving frame 12 can be finely adjusted when installing the manhole cover 10. In addition, although the inner diameter of the receiving opening 22 is smaller than the outer diameter of the riser pipe 104, when the thickness of the foam tape 18 is added to the riser pipe 104 it becomes larger than the inner diameter of the receiving opening 22, so the riser pipe 104 and the receiving opening 22 (and consequently the top cover 14) can be installed concentrically.

[0039] Furthermore, in this connection structure 100, the inner surface of the receiving opening 22 is tapered, and the gap 24 at the tip of the receiving opening 22 is larger than the thickness of the foam tape 18, making it easier to insert the riser pipe 104 into the receiving opening 22 and facilitating the installation of the receiving frame 12. In addition, by forming the inner surface of the receiving opening 22 in a tapered shape, the receiving frame 12 becomes less likely to move, and the receiving frame 12 can be temporarily fixed (held) more stably and firmly by the foam tape 18. Also, when the receiving frame 12 is tilted and temporarily fixed, a constant compression of the foam tape 18 can be maintained.

[0040] Next, referring to Figures 12 and 13, we will explain the method for installing a manhole cover 10 in a construction site where the ground surface (GL) is sloped. Here, we will explain using the case where the decorative materials 106 and 108 are interlocking blocks as an example.

[0041] When installing the manhole cover 10, first prepare the installation components such as the manhole 102, riser pipe 104, manhole cover 10, inner cover 16, and foam tape 18, and install the manhole 102 in the ground so that the upper end of the riser pipe 104 is exposed, as shown in Figure 12(A). At this time, adjust the height position of the upper end of the riser pipe 104 so that when the receiving frame 12 is connected to the riser pipe 104, the upper end surface of the receiving frame 12 and the ground surface GL are installed flush. Also, attach the foam tape 18 in a ring shape to the outer surface of the upper end of the riser pipe 104.

[0042] Next, as shown in Figure 12(B), the riser pipe 104 and the receiving frame 12 are connected by fitting the upper end of the riser pipe 104 straight into the receiving opening 22 of the receiving frame 12. At this time, the receiving frame 12 is supported by foam tape 18. Subsequently, as shown in Figure 12(C), the receiving frame 12 is temporarily fixed in an inclined position relative to the riser pipe 104 so that the upper end surface of the receiving frame 12 is flush with the expected ground surface GL, that is, so that when the decorative materials 106 and 108 are installed, the upper surface of the decorative material 108 provided on the manhole cover 10 (specifically the upper cover 14) and the upper surface of the decorative material 106 provided around the receiving frame 12 are flush. In this case, simply by tilting the receiving frame 12 relative to the riser pipe 104, the foam tape 18 is compressed between the outer surface of the upper end of the riser pipe 104 and the inner surface of the receiving opening 22, allowing the receiving frame 12 to be temporarily fixed in an tilted position (i.e., positioned) relative to the riser pipe 104. Furthermore, because the inner surface of the receiving opening 22 is tapered, the receiving frame 12 can be temporarily fixed stably and firmly by the foam tape 18.

[0043] Next, as shown in Figure 13(D), the inner lid 16 is attached to the upper end of the riser pipe 104, and the upper lid 14 is attached to the upper lid housing section 20 of the receiving frame 12. At this time, the seal ring 68 provided on the outer surface of the inner lid 16 is compressed between the outer surface of the inner lid 16 and the inner surface of the riser pipe 104. This ensures airtightness and watertightness between them, and the upper end opening of the riser pipe 104 is properly sealed by the inner lid 16, preventing rainwater from entering the manhole 102 and preventing odors from leaking out of the riser pipe 104. The upper lid 14 is also held in the upper lid housing section 20 with the upper end surface of its side wall 42 flush with the upper end surface of the receiving frame 12 by being locked to the upper lid support section 20a. However, the inner cover 16 can be attached to the riser pipe 104 before connecting the receiving frame 12 to the riser pipe 104, and the top cover 14 can be attached to the receiving frame 12 before temporarily fixing the receiving frame 12 in an inclined position.

[0044] Next, as shown in Figure 13(E), crushed stone 110 and mortar 112 are applied to the upper end of the riser pipe 104 and around the receiving frame 12. At this time, it is preferable to apply the mortar 112 so that its upper surface is flush with the bottom surface of the upper lid housing section 20 (i.e., with a slope). The receiving frame 12 is fixed in place once the mortar 112 hardens. Furthermore, before the mortar 112 hardens, it is possible to make fine adjustments to the height position and inclination angle of the receiving frame 12.

[0045] Then, as shown in Figure 13(F), decorative materials 106 and 108 are applied around the recessed portion 40 of the top cover 14 and the receiving frame 12. Specifically, decorative material 106 is applied around the manhole cover 10 using a fixing material 116 such as adhesive or bedding mortar so that it is flush with the upper end surface of the manhole cover 10 (receiving frame 12 and top cover 14), and decorative material 108 is fitted into the recessed portion 40 of the top cover 14 via a fixing material 118 similar to the fixing material 116. As a result, the decorative material 108 fitted inside the top cover 14 is held at an angle so that it is flush with the surrounding decorative material 106.

[0046] As described above, according to this embodiment, the receiving frame 12 can be temporarily fixed in an inclined position relative to the rising pipe 104 by the foam tape 18 provided in the gap 24 between the outer surface of the upper end of the rising pipe 104 and the inner surface of the receiving opening 22, so that it can be appropriately handled even when the ground surface of the installation site is sloped. Furthermore, even after the manhole cover 10 is temporarily fixed, the height position and inclination angle of the receiving frame 12 can be finely adjusted until the surrounding mortar 112 hardens, thus improving the workability of the manhole cover 10.

[0047] In the above embodiment, crushed stone 110 was installed on the underside of the mortar 112, but concrete can be installed instead of crushed stone 110 (not shown). Also, if the decorative materials 106 and 108 are tiles, concrete 120 may be installed instead of mortar 112, as shown in Figure 14. In this case, the receiving frame 12 will be fixed in place as the concrete 120 hardens.

[0048] Furthermore, the specific configuration of the manhole cover 10 provided by the connection structure 100 is not limited to those described above, and can be modified as appropriate without departing from the spirit of this invention.

[0049] For example, in the above embodiment, the top lid 14 and the top lid housing section 20 that accommodates the top lid 14 are formed in a cylindrical shape, but the top lid 14 and the top lid housing section 20 can also be formed in a rectangular cylindrical shape (square or rectangular in plan view).

[0050] Furthermore, in the above embodiment, when forming the inner surface of the receiving opening 22 of the receiving frame 12 in a tapered shape, the diameter was gradually increased from the first tapered surface 22a to the second tapered surface 22b. However, the diameter may be increased continuously at a constant angle from the back to the tip of the receiving opening 22. Also, only one of the first tapered surface 22a and the second tapered surface 22b may be formed. Moreover, the inner surface of the receiving opening 22 does not necessarily have to be formed in a tapered shape; it can also be formed in a straight shape with a constant inner diameter from the back to the tip of the receiving opening 22.

[0051] Furthermore, in the above-described embodiment, an inner cover 16 is attached to the upper end of the riser pipe 104. However, if the manhole 102 is a rainwater manhole (i.e., not for sewage purposes), the inner cover 16 is not necessarily required.

[0052] Please note that the specific dimensions and configurations mentioned above are merely examples and can be modified as needed according to product specifications and other requirements. [Explanation of symbols]

[0053] 10 …Mass cover 12 ... Receiving slots 14...Top lid 16 ... Inner lid 18… Foam tape (temporary fixing material) 20 ... Upper lid storage compartment 22 …Socket 40 ... recessed area 100 ... Connection structure of manhole cover 102 ... Masu 104 ... riser pipe 106,108 ... Decorative materials

Claims

1. A manhole cover connection structure for connecting a manhole cover to a riser pipe of a manhole, wherein a decorative material is provided on the upper surface of the manhole cover, The aforementioned manhole cover is, A receiving frame having an upper lid housing section and a receiving opening formed on the lower side of the upper lid housing section and connected to the upper end of the riser pipe, The upper surface has a recess into which the decorative material is fitted, and the upper lid is detachably held in the upper lid housing, The inner diameter of the socket is set to be larger than the outer diameter of the riser pipe. A temporary fixing member is provided in the gap between the outer surface of the upper end of the riser pipe and the inner surface of the receiving opening, and is capable of temporarily fixing the receiving frame in an inclined position relative to the riser pipe. The inner surface of the socket is formed in a tapered shape that widens from the back to the front of the socket, thus forming a connection structure for a manhole cover.

2. The manhole cover connection structure according to claim 1, wherein the temporary fixing member is compressed between the outer surface of the upper end of the riser pipe and the inner surface of the receiving opening, thereby temporarily fixing the receiving frame in an inclined state relative to the riser pipe.

3. The manhole cover connection structure according to claim 1 or 2, comprising an inner cover that has a fitting portion fitted to the upper end of the riser pipe and seals the upper end opening of the riser pipe.

4. The size of the gap between the inner portion of the socket where the temporary fixing member is placed and the riser pipe is smaller than the thickness of the temporary fixing member in the state before the riser pipe and the socket are connected. The manhole cover connection structure according to claim 1 or 2, wherein the size of the gap between the tip portion of the socket and the riser pipe is greater than the thickness of the temporary fixing member in the state before the riser pipe and the socket are connected.

5. A method for installing a manhole cover, in which a decorative material is provided on the top surface, in a construction site where the ground surface is sloped, (a) A step of preparing a manhole cover comprising a receiving frame having a lid receiving section and a receiving opening formed on the lower side of the lid receiving section, and a lid having a recess on its upper surface into which the decorative material is fitted, and which is detachably held in the lid receiving section, wherein the inner diameter of the receiving opening is larger than the outer diameter of the riser pipe of the manhole, (b) A step of installing the manhole underground such that the upper end of the riser pipe is exposed, (c) Connecting the receiving opening of the receiving frame to the upper end of the riser pipe, and temporarily fixing the receiving frame at an angle to the riser pipe so that when the decorative material is installed, the upper surface of the decorative material provided on the manhole cover and the upper surface of the decorative material provided around the receiving frame are flush. (d) Step of attaching the upper lid to the upper lid housing portion of the receiving frame, (e) The step of fixing the receiving frame by applying mortar or concrete around the receiving frame, (f) A method for installing a manhole cover, comprising the step of applying decorative material to the recessed portion of the upper cover and around the receiving frame.

6. The method for installing a manhole cover according to claim 5, wherein in step (c), a temporary fixing member is attached to the outer surface of the upper end of the riser pipe, and the temporary fixing member is compressed between the outer surface of the upper end of the riser pipe and the inner surface of the receiving opening, thereby temporarily fixing the receiving frame in an inclined position relative to the riser pipe.

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