JP2011140836A - Lid receiving frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lid receiving frame, which is configured to facilitate minute adjustment for the height position of a manhole lid while reducing the operation time required for the height adjustment of the manhole lid. <P>SOLUTION: The lid receiving frame includes a cylindrical fixed frame 2 having a recessed groove 8 formed on the inner periphery, and a cylindrical body frame on which the manhole lid is placed. A projection 12 to be screwed to the recessed groove 8 is formed on the outer periphery of the body frame in a protruding manner. An engaging portion 11 is continuously provided on a lower side wall 8b of the recessed groove 8 along the recessed groove 8, the engaging portion preventing the projection 12 from moving along the recessed groove 8 in a state where the engaging portion is engaged with an engaged portion 15 provided on the lower surface side of the projection 12, and allowing the projection 12 to move along the recessed groove 8 in a state where the engagement is released. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lid receiving frame for supporting a manhole lid.

  A manhole cover for closing the manhole is placed on the manhole provided on the road surface. This manhole cover is placed so as to be flush with the road surface by a lid receiving frame embedded in the road surface.However, the manhole cover is placed between the manhole cover and the road surface due to subsidence and wear of the road surface around the manhole, and the repair of the road surface. When a step is generated, it is necessary to make an adjustment to make the height position of the manhole cover coincide with the road surface.

FIG. 6 is a cross-sectional view showing a lid receiving frame of the conventional manhole cover. In FIG. 6, the lid receiving frame 100 includes a fixed frame 103 that receives the manhole cover 101. The lid receiving frame 100 is supported by a plurality of neck blocks 105 stacked on a manhole block 104 embedded in the roadbed R.
The neck block 105 is a ring-shaped member made of concrete or the like, and a plurality of anchor bolts 105a for fixing the lid receiving frame 100 project from the upper surface of the neck block 105 placed on the top. ing.
The lid receiving frame 100 and the neck block 105 are embedded in the roadbed R so that the manhole cover 101 is flush with the road surface R1.

In the lid receiving frame 100, in order to adjust the height position of the manhole cover 101 according to the sinking or renovation of the road surface, first, the roadbed R around the lid receiving frame 100 and the neck block 105 is excavated and exposed. In addition, the height position of the lid receiving frame 100 is adjusted by changing the thickness and the number of the neck blocks 105. Thereafter, the roadbed R is repaired, and the lid receiving frame 100 and the neck block 105 are embedded again. Thereby, the height position of the manhole cover 101 placed on the cover receiving frame 100 can be adjusted.
As described above, in the conventional lid receiving frame, it is necessary to excavate and repair the surrounding roadbed in order to perform the work for adjusting the height position of the manhole cover. Since it takes a long time, there is a problem that traffic control must be performed for a long time. Further, the conventional lid receiving frame 100 has a problem that it is difficult to finely adjust the height position because the height adjustment is performed by changing the thickness and the number of the neck blocks 105.

For the above problem, a cylindrical main body frame that receives a manhole cover, a fixed frame that accommodates the main body frame on the inner peripheral side and is fixedly supported by the foundation block, and is accommodated on the inner peripheral side of the fixed frame. A lid receiving frame having a predetermined number of raising spacers interposed between a fixed frame and a main body frame has been proposed.
According to this lid receiving frame, since the main body frame and the raising spacer are accommodated on the inner peripheral side of the fixed frame, the height position of the main body frame that receives the manhole cover is adjusted by the raising spacer without excavating the roadbed. can do. For this reason, the work time required for excavation and repair of the roadbed becomes unnecessary, and the work time required for adjusting the height position of the manhole cover can be shortened (see, for example, Patent Document 1).

JP-A-9-125430

  However, in the lid receiving frame described in the above-mentioned patent document, since the height position of the manhole cover is adjusted by changing the thickness and number of the raising spacers, it is still difficult to finely adjust the height position. Had the problem.

  The present invention has been made in view of such circumstances, and a lid receiving frame that can easily perform fine adjustment of the height position of the manhole cover while shortening the work time required for adjusting the height of the manhole cover. The purpose is to provide.

  The present invention for achieving the above object is a lid receiving frame that is embedded in a roadbed and supports a manhole cover, and a cylindrical fixed frame that is fixed to the upper surface of a housing embedded in the roadbed, and a part thereof A cylindrical main body frame that is introduced into the inner peripheral side of the fixed frame so as to be relatively rotatable and on which the manhole cover is placed, and includes an inner peripheral surface of the fixed frame and an outer peripheral surface of the main body frame Either one is formed with a spiral groove having an upper side wall and a lower side wall facing each other, and the other of the inner peripheral surface of the fixed frame and the outer peripheral surface of the main body frame is formed with the concave groove. A male threaded portion that is screwed into the groove, and the male threaded portion extends along the concave groove in a state in which the lower side wall of the concave groove is engaged with the engaged portion provided on the lower surface side of the male threaded portion. While preventing the movement, the male screw portion is along the concave groove in a state where the engagement is released. Engaging portions to allow for movement is characterized by being provided continuously along the groove.

According to the lid receiving frame configured as described above, the male screw portion moves along the concave groove on the lower side wall of the concave groove in a state of being engaged with the engaged portion provided on the lower surface side of the male screw portion. In addition, an engagement portion is provided that prevents the male screw portion from moving along the concave groove when the engagement is released, so that the main body frame is fixed when the engagement is released. It can be rotated relative to the frame, and the height position of the main body frame can be adjusted. On the other hand, if the height position of the main body frame is adjusted and the engaging portion and the engaged portion are engaged, the height of the main body frame is set according to the height position determined by the position of the concave groove of the engaging portion at that time. The position can be maintained and fixed.
Here, since the engaging portion of the concave groove is continuously formed along the concave groove, the engaging portion of the engaging portion that engages when the height position of the main body frame is maintained and fixed. The height position of the groove can be continuously finely adjusted. As a result, fine adjustment of the height position of the manhole cover can be easily performed.
In addition, since the main body frame on which the manhole cover is placed is introduced on the inner periphery side of the fixed frame, the height of the manhole cover can be adjusted without excavating the surrounding roadbed, resulting in shorter work time. Can be achieved.

In the above-described lid receiving frame, the engaging portion includes an uneven surface in which concave portions and convex portions are alternately arranged along the concave groove, and the engaged portion of the male screw portion includes the plurality of concave portions and the convex portions. It is preferable that it consists of an uneven surface meshing simultaneously with at least one of the above.
In this case, the engaged portion of the male screw portion is engaged with at least one of the plurality of concave portions and the convex portions at the same time, so that the engagement portion is more reliably and firmly engaged. For this reason, even when a large load is applied to the manhole cover, the movement of the male screw portion in the circumferential direction can be reliably restricted, and the main body frame can be reliably maintained and fixed at a certain height.

Moreover, the fastening means which clamps both to an axial direction may be provided in the inner peripheral surface side of the said fixed frame and the said main body frame.
In this case, the tightening means can prevent the lower surface of the male screw portion and the engaging portion of the concave groove from separating by tightening the fixing frame and the main body frame in the axial direction, thereby releasing the engagement. Thus, it is possible to prevent the movement of the male screw portion in the circumferential direction.
In addition, since the fastening means is provided on the inner peripheral surface side of the fixed frame and the main body frame, it is possible to tighten the fixed frame and the main body frame in accordance with the height adjustment of the manhole cover without excavating the surrounding roadbed. Or the tightening can be released.

The tightening means includes a circumferential groove formed on one inner peripheral surface of the fixed frame and the main body frame, and the other inner peripheral surface side of the fixed frame and the main body frame on one end side. A locking rod having a bolt portion that is held so as to be movable up and down, and having a locking portion that is locked to the circumferential groove at the other end portion so as to be movable along the circumferential groove, and the other frame. Preferably, the nut is screwed into the locking rod in a fixed state and moves the locking rod up and down by a rotating operation.
In this case, since the locking rod is locked so as to be movable along the circumferential groove, the locking rod is moved up and down by rotating the nut while maintaining the relative rotation between the fixed frame and the main body frame. Both can be tightened.

  According to the lid receiving frame of the present invention, it is possible to easily perform fine adjustment of the height position of the manhole cover while shortening the work time required for adjusting the height of the manhole cover.

It is sectional drawing which shows the lid receiving frame which concerns on one Embodiment of this invention. (A) is the perspective view which expands and shows a part of inner peripheral surface of the large diameter cylindrical part of a fixed frame, (b) is the external view which looked at the inner peripheral surface from the front. It is an expanded sectional view of the periphery of a locking rod. (A) is a top view of a lifting jig, (b) is a side view of a lifting jig. It is a figure which shows the other aspect of the ditch | groove formed in the fixed frame. It is sectional drawing which shows the cover receiving frame of the conventional manhole cover.

Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a lid receiving frame according to an embodiment of the present invention.
In the figure, a lid receiving frame 1 supports a manhole cover C that closes an opening of a manhole M provided on a road surface R1, and a neck block B installed on a manhole block (not shown) embedded in a roadbed R. It is fixed to the upper surface of the.
The lid receiving frame 1 supports the manhole cover C so that the upper surface of the manhole cover C is flush with the road surface R1, and a cylindrical fixed frame 2 fixed to the upper surface of the neck block B as a housing, A cylindrical main body frame 3 that is concentrically introduced on the inner peripheral side of the fixed frame 2 and on which the manhole cover C is placed is provided.

The fixed frame 2 is a member formed of a metal material such as iron, and includes a flange portion 4 that is in contact with the upper surface of the neck block B, and a small-diameter cylindrical portion 5 that is erected upward from the inner peripheral end of the flange portion 4. And a large diameter cylindrical portion 7 connected to the upper end portion of the small diameter cylindrical portion 5.
The flange portion 4 is formed with a plurality of holes 4a through which anchor bolts b1 projecting from the neck block B are inserted. The fixed frame 2 is fixed by an anchor bolt b1 and a nut b2 screwed thereto with the lower surface 4b of the flange portion 4 in contact with the upper surface of the neck block B.

  A circumferential groove 5b formed along the circumferential direction is formed on the inner circumferential surface 5a of the small diameter cylindrical portion 5. A rod-like locking rod 30 that tightens the fixed frame 2 and the main body frame 3 in the axial direction is engaged with the circumferential groove 5b. The details of the locking rod 30 will be described later.

The large-diameter cylindrical portion 7 disposed concentrically above the small-diameter cylindrical portion 5 is formed in a cylindrical shape whose inner and outer dimensions are larger than those of the small-diameter cylindrical portion 5, and has a helical recess on the inner peripheral surface 7a. A groove 8 is formed.
2A is an enlarged perspective view showing a part of the inner peripheral surface 7a of the large-diameter cylindrical portion 7 of the fixed frame 2, and FIG. 2B is an external view of the inner peripheral surface viewed from the front. FIG. As shown in the figure, the recessed groove 8 is recessed from the inner peripheral surface 7a toward the radially outer side and is formed in a spiral shape along the circumferential direction. The upper side wall 8a and the lower side wall 8b that face each other are formed. have.

On the lower side wall 8b, an engaging portion 11 constituted by a concave portion 9 and a convex portion 10 formed adjacent to the concave portion 9 is continuously provided along the concave groove 8. The engaging portion 11 is an uneven surface in which the concave portions 9 and the convex portions 10 are alternately arranged along the concave grooves 8.
Further, four protrusions 12 described later formed on the main body frame 3 are screwed into the concave groove 8, and the main body frame 3 is fixed to the fixed frame by screwing these four protrusions 12 into the concave groove 8. 2 is fixed.

Returning to FIG. 1, the main body frame 3 is a member formed of a metal material such as iron, and a cylindrical portion 13 disposed concentrically on the inner peripheral side of the large-diameter cylindrical portion 7 and an upper end of the cylindrical portion 13. And an annular upper surface portion 14 extending outward in the radial direction.
A stepped portion 14 a on which the manhole cover C is placed is formed at the upper end on the inner peripheral side of the upper surface portion 14.
The main body frame 3 is embedded in the roadbed R after the height position with respect to the fixed frame 2 is adjusted so that the upper surface of the upper surface portion 14 and the manhole cover C are flush with the road surface R1.

  A cylindrical portion 14 b that extends downward and covers the upper end of the outer peripheral surface of the large-diameter cylindrical portion 7 of the fixed frame 2 is formed at the outer peripheral end portion of the upper surface portion 14. The cylindrical portion 14 b prevents asphalt, earth, or the like constituting the outer roadbed R from entering between the main body frame 3 and the fixed frame 2 from the upper end of the large-diameter cylindrical portion 7.

  Further, a stepped surface 14 c is formed on the outer peripheral surface of the upper surface portion 14 so as to face upward along the circumferential direction. When the main body frame 3 is embedded in the roadbed R, the horizontal direction is maintained by the roadbed R formed along the stepped surface 14c. It is possible to prevent the R1 from easily deviating.

On the outer peripheral surface of the cylindrical portion 13, the above-described four protrusions 12 project from the circumferential direction. The four protrusions 12 are arranged at equal intervals in the circumferential direction. As described above, the main body frame 3 is fixed to the fixed frame 2 by screwing the protrusions 12 into the concave grooves 8. That is, the four protrusions 12 constitute male thread portions for screwing the main body frame 3 to the fixed frame 2, and by rotating the main body frame 3 relative to the fixed frame 2, The height position with respect to the fixed frame 2 can be adjusted.
Further, the thickness dimension of the projection 12 in the axial direction (vertical direction) is set smaller than the groove width dimension of the concave groove 8.

  As shown in FIGS. 2A and 2B, on the lower surface side of the protrusion 12, there are a recessed portion 9 constituting the engaging portion 11 of the recessed groove 8 and an engaged portion 15 that meshes with the protruding portion 10. Is provided. The engaged portion 15 includes a convex portion 16 formed so as to fit in the concave portion 9 of the engaging portion 11 and a concave portion 17 formed so as to fit in the convex portion 10 of the engaging portion 11. The surface is an uneven surface.

  The engaged portion 15 provided on the lower surface side of each protrusion 12 meshes with the plurality of concave portions 9 and convex portions 10 in the engaging portion 11 at the same time and is engaged with each other. As a result, the protrusions 12 are prevented from moving in the circumferential direction along the concave grooves 8, and the main body frame 3 is restricted from rotating relative to the fixed frame 2.

On the other hand, as described above, the thickness dimension of each protrusion 12 in the axial direction is set smaller than the groove width dimension of the recessed groove 8. It is possible to lift the frame 3 upward. Specifically, the thickness dimension is determined by lifting the main body frame 3 upward so that the lower surface of each protrusion 12 is separated from the engaging portion 11 of the lower side wall 8b, and the convex portion 16 and the concave portion 17 are formed in the concave portion of the concave groove 8. 9 and the convex part 10 and set to a value that can release the engagement between the engaging part 11 and the engaged part 15.
Thus, the engagement between the engaging portion 11 and the engaged portion 15 is released by pulling the lower surface of the protrusion 12 away from the engaging portion 11 of the lower side wall 8 b, and each protrusion 12 is formed in the groove 8. Movement along the circumferential direction is allowed, and relative rotation of the main body frame 3 with respect to the fixed frame 2 is allowed.

As described above, the engaging portion 11 of the lower side wall 8b prevents the protrusion 12 from moving in the circumferential direction in a state where the engaged portion 15 provided on each protrusion 12 is engaged, and the main body. When the engagement between the engaging portion 11 and the engaged portion 15 is released by lifting the frame 3 and pulling the lower surface of each protrusion 12 away from the lower side wall 8b, the protrusion 12 moves in the circumferential direction. Is acceptable.
In the figure, the four protrusions 12 of the main body frame 3 are arranged at equal intervals along the circumferential direction. However, if the main body frame 3 can be supported and fixed to the fixed frame 2, three protrusions 12 are arranged. Alternatively, a larger number of protrusions 12 may be arranged. It can also be formed into a continuous thread.
In the present embodiment, the engaged portion 15 has three convex portions 16 and two concave portions 17, but at least one of the convex portions 16 and the concave portions 17 is formed and engaged. It is only necessary to be able to mesh with at least one of the concave portion 9 and the convex portion 10 of the portion 11. Further, a larger number of convex portions 16 and concave portions 17 can be formed.

A bracket 13 a into which the above-described locking rod 30 is inserted is formed at the lower end portion of the inner peripheral surface of the cylindrical portion 13.
FIG. 3 is an enlarged cross-sectional view around the locking rod 30.
The brackets 13a are formed at four positions along the circumferential direction at equal intervals, and the locking rods 30 are inserted into the respective holes 13b and are held so as to be vertically movable.

  The locking rod 30 has a rod-shaped bolt portion 30a having an external thread formed on the outer peripheral surface on the upper end side, and is locked on the lower end side in a circumferential groove 5b formed in the small diameter cylindrical portion 5 of the fixed frame 2. It has the latching | locking part 30b.

The circumferential groove 5b includes an opening groove 5b1 that opens on the inner peripheral surface 5a of the small diameter cylindrical portion 5, and an inner groove 5b2 that is formed wider on the outer peripheral side of the opening groove 5b1 than the opening groove 5b1.
The locking portion 30b connects the guide portion 30b1 formed with a slight gap to the inner side surface of the inner groove 5b2 and the guide portion 30b1 inserted into the opening groove 5b1 and the lower end of the bolt portion 30a. Connecting portion 30b2.
The guide portion 30b1 is a massive member that can slide inside the inner groove 5b2. The guide portion 30b1 locks the connecting portion 30b2 to the inner groove 5b2 while allowing the connecting portion 30b2 to move along the inner groove 5b2. ing. Accordingly, the locking portion 30b is locked to the circumferential groove 5b so as to be movable along the circumferential groove 5b.

A locking nut 18 is screwed into each bolt portion 30 a of each locking rod 30. The nut 18 is screwed into the bolt portion 30a while being fixed to the upper surface of the bracket 13a on the upper side of the bracket 13a. The nut 18 moves the locking rod 30 up and down by being rotated. As a result, the nut 18 and the locking rod 30 are tightened so that the bracket 13a and the locking portion 30b engaged with the inner groove 5b2 are close to each other in the axial direction, and the fixing frame 2 and the main body frame 3 are connected. It can be tightened in the axial direction.
As described above, the circumferential groove 5b, the bracket 13a, the nut 18, and the locking rod 30 constitute fastening means for fastening the fixed frame 2 and the main body frame 3 in the axial direction.

As described above, the engaging portion 15 of the protrusion 12 and the engaging portion 11 of the lower side wall 8b of the groove 8 are obtained by tightening the fixing frame 2 and the main body frame 3 in the axial direction by the tightening means. It is possible to prevent the protrusions 12 from being separated, thereby preventing the protrusions 12 from being allowed to move in the circumferential direction.
Moreover, since the circumferential groove 5b, the bracket 13a, and the locking rod 30 are provided on the inner peripheral surface side of the fixed frame 2 and the main body frame 3, the height of the manhole cover C can be increased without excavating the surrounding roadbed R. The fixing frame 2 and the main body frame 3 can be tightened or the tightening can be released along with the height adjustment.

  Further, since the locking portion 30b of the locking rod 30 is engaged with the circumferential groove 5b so as to be movable along the circumferential groove 5b, both of the fixed frame 2 and the main body frame 3 are maintained while maintaining relative rotation. Can be tightened.

As described above, the lid receiving frame 1 having the above configuration fixes the main body frame 3 to the fixed frame 2 by screwing the protrusions 12 of the main body frame 3 into the concave grooves 8 of the fixed frame 2. By rotating the main body frame 3 relative to the fixed frame 2, the height position of the main body frame 3 with respect to the fixed frame 2 can be adjusted. Hereinafter, a method for adjusting the height position of the main body frame 3 will be described.
The lid receiving frame 1 is configured so that the engaging portion 11 of the groove 8 formed in the fixed frame 2 and the engaged portion 15 of the protrusion 12 formed on the main body frame 3 are engaged with each other. Movement in the direction is prevented, and relative rotation of the main body frame 3 with respect to the fixed frame 2 is restricted. On the other hand, in a state where the engaging portion 11 of the concave groove 8 and the engaged portion 15 of the protrusion 12 are separated, the engagement between the engaging portion 11 and the engaged portion 15 is released, and each protrusion 12 is Thus, movement in the circumferential direction is possible, and relative rotation of the main body frame 3 with respect to the fixed frame 2 is allowed.

Therefore, in order to rotate the main body frame 3 relative to the fixed frame 2, the main body frame 3 in a state of being screwed to the fixed frame 2 is lifted upward, so that the protrusion 12 of the main body frame 3 is recessed in the fixed frame 2. 8 must be separated from the lower side wall 8b.
In the lid receiving frame 1 of the present embodiment, the main body frame 3 is lifted upward using a lifting jig that can be attached to and detached from the main body frame 3, and then the main body frame 3 is rotated to adjust its height position.

FIG. 4A is a plan view of the lifting jig 40, and FIG. 4B is a side view of the lifting jig 40.
In the figure, the lifting jig 40 includes two beam bars 41 arranged orthogonally to each other above the main body frame 3 and a slider 42 attached so as to be slidable along the beam bars 41.
Two sliders 42 are attached to one beam bar 41.
The slider 42 is provided with a column 43 for lifting the main body frame 3 so as to extend downward. At the lower end of the column 43, a rod-shaped locking portion 44 formed to bend the column 43 is provided.
Four holes 14 d into which the locking portions 44 of the lifting jig 40 are inserted are formed at equal intervals in the circumferential direction at the upper end portion of the upper surface portion 14 in the main body frame 3.

In order to lift the main body frame 3 using the lifting jig 40 having the above configuration, first, the fastening of the fixing frame 2 and the main body frame 3 in the axial direction by the locking rod 30 is released.
Next, by moving the position of each slider 42, the locking portion 44 of each column 43 is inserted into the corresponding hole 14d. Thereby, the lifting jig 40 is attached to the main body frame 3. Then, the main body frame 3 can be lifted upward by pulling the attached lifting jig 40 upward.
If the main body frame 3 is lifted so that the projection 12 of the main body frame 3 can be separated from the lower side wall 8b of the concave groove 8 of the fixed frame 2, the relative rotation of the main body frame 3 with respect to the fixed frame 2 is allowed. By rotating the jig 40, the main body frame 3 can be rotated relative to the fixed frame 2, and the height position of the main body frame 3 can be adjusted.

According to the lid receiving frame 1 configured as described above, the protrusion 12 is formed on the lower side wall 8 b of the groove 8 in a state where the protrusion 12 is engaged with the engaged portion 15 provided on the lower surface of the protrusion 12. The engagement portion 11 is provided so as to prevent the projection 12 from moving along the concave groove 8 in a state in which the projection 12 is moved in the released state. In the state, the main body frame 3 can be rotated relative to the fixed frame 2, and the height position of the main body frame 3 can be adjusted. On the other hand, if the height position of the main body frame 3 is adjusted and the engaging portion 11 and the engaged portion 15 are engaged, the height position determined by the position of the concave groove 8 of the engaging portion 11 at that time is determined. Thus, the height of the main body frame 3 can be maintained and fixed.
Here, since the engaging portion 11 of the concave groove 8 is continuously formed along the concave groove 8, the engaged portion 15 is engaged when the height position of the main body frame 3 is maintained and fixed. The height position of the concave groove 8 of the engaging portion 11 to be adjusted can be continuously finely adjusted. As a result, fine adjustment of the height position of the manhole cover C can be easily performed.

  Further, in the conventional lid receiving frame, it is necessary to excavate the roadbed around the lid receiving frame, adjust the height position of the manhole cover, and then bury the excavated portion again to repair the roadbed. On the other hand, according to the lid receiving frame 1 of the present embodiment, since the main body frame 3 on which the manhole cover C is placed is introduced on the inner peripheral side of the fixed frame 2, the surrounding roadbed R is excavated. Therefore, the height of the manhole cover C can be adjusted, and as a result, the working time can be shortened.

  Further, in the present embodiment, the engaging portion 11 of the concave groove 8 is an uneven surface in which the concave portions 9 and the convex portions 10 are alternately arranged along the concave groove 8. Since the concave and convex surfaces 16 and 17 that mesh with the concave portions 9 and the convex portions 10 at the same time are alternately arranged, the concave portion 16 and the convex portions 10 are engaged with the engaging portion 11 more securely and firmly, and a large load acts on the manhole cover C. Even in this case, the movement of the protrusion 12 in the circumferential direction can be reliably restricted, and the main body frame 3 can be reliably maintained and fixed at a certain height.

The present invention is not limited to the above embodiment. In the above embodiment, the concave groove 8 is provided in the fixed frame 2 and the protrusion 12 as the male screw portion is provided in the main body frame 3. However, the concave groove 8 is provided in the outer peripheral surface of the main body frame 3, and You may provide the external thread part screwed together in the concave groove 8. FIG.
Moreover, in the said embodiment, although the engaging part 11 of the ditch | groove 8 was comprised by the recessed part 9 and the convex part 10 which were formed in the cross-section substantially square shape, as shown in FIG. The concave portion 9 and the convex portion 10 can also be constituted by the upright surface portion 20 formed substantially perpendicularly and the inclined portion 21 inclined in the opposite direction to the inclined direction of the lower side wall 8b of the concave groove 8. In the case of FIG. 5, the engaged portion 15 provided on the protrusion 12 that engages with the engaging portion 11 is also shaped to engage with the concave portion 9 and the convex portion 10.
Moreover, in the said embodiment, although the locking rod 30 was fixed to the inner peripheral surface side of the main body frame 3, and the circumferential groove 5b with which the locking rod 30 engages was provided in the inner peripheral surface side of the fixed frame 2, although fixed The locking rod 30 may be fixed to the inner peripheral surface side of the frame 2 and the peripheral groove 5b may be provided on the main body frame 3 side.

1 Lid receiving frame 2 Fixed frame 3 Body frame 5b Circumferential groove (tightening means)
8 concave groove 8a upper side wall 8b lower side wall 9 concave portion 10 convex portion 11 engaging portion 12 protrusion (male screw portion)
13a Bracket (Tightening means)
15 engaged portion 18 nut (tightening means)
30 Locking rod (tightening means)
B Manhole block (frame)
C Manhole cover R Roadbed

Claims (4)

A lid receiving frame embedded in the roadbed and supporting the manhole lid,
A cylindrical fixing frame fixed to the upper surface of the housing embedded in the roadbed;
A part of the fixed frame is introduced into the inner peripheral side of the fixed frame so as to be relatively rotatable, and a cylindrical body frame on which the manhole cover is placed,
On either one of the inner peripheral surface of the fixed frame and the outer peripheral surface of the main body frame, a spiral concave groove having an upper side wall and a lower side wall facing each other is formed,
On the other of the inner peripheral surface of the fixed frame and the outer peripheral surface of the main body frame, a male screw portion that is screwed into the concave groove is protruded.
The lower side wall of the concave groove prevents the male screw portion from moving along the concave groove in a state of being engaged with the engaged portion provided on the lower surface side of the male screw portion, and the engagement The lid receiving frame is characterized in that an engagement portion that allows the male screw portion to move along the groove is continuously provided along the groove in a state in which is released. The engaging portion is composed of an uneven surface in which concave portions and convex portions are alternately arranged along the concave groove,
2. The lid receiving frame according to claim 1, wherein the engaged portion of the male screw portion includes an uneven surface that meshes simultaneously with at least one of the plurality of concave portions and the convex portions.   The lid receiving frame according to claim 1 or 2, wherein a fastening means for fastening both the fixing frame and the main body frame in the axial direction is provided on an inner peripheral surface side of the fixing frame and the main body frame. The tightening means includes a circumferential groove formed on an inner circumferential surface of one of the fixed frame and the main body frame;
One end side has a bolt portion that can be moved up and down on the other inner peripheral surface side of the fixed frame and the main body frame, and the other end portion is movable along the circumferential groove. A locking rod having a locking portion locked in the groove;
The lid receiving frame according to claim 3, further comprising: a nut that is screwed into the locking rod while being fixed to the other frame, and that moves the locking rod up and down by a rotation operation.

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