JP4518521B2 - How to replace the manhole cover and its receiving frame - Google Patents

Description

  The present invention relates to a manhole iron cover that replaces an old manhole iron cover and its receiving frame, and a method for replacing the receiving frame, due to long-term use, the load of an automobile passing over it, friction during running, etc. is there.

  As a method for exchanging the manhole iron cover and the receiving frame, in the old days, a method has been used in which the pavement is deleted in a substantially square shape when viewed from the plane centering on the target manhole. In this case, the manhole frame and iron cover are removed simultaneously or sequentially, and after that, of course, a new frame and iron cover are installed while adjusting the height, and the removed pavement around it is refilled. The road will be restored. For filling the deleted pavement, crushed stone or the like has been used as the roadbed material, and asphalt heating compound has been adopted as the surface layer material.

  As described above, the removed portion of the pavement has the advantage of being inexpensive because crushed stone is used as the roadbed material and asphalt composite material is used as the surface layer material. In addition, cutting the pavement into a square when viewed from above can be performed using a general-purpose cutter device, and there is an advantage that no special device is required. On the other hand, the pavement in a wider range than necessary is deleted, and there is a problem that a large amount of waste material is generated. In addition, since the cut with respect to the pavement is performed at a right angle to the traveling direction of the road surface, the vehicle is in contact with the wheel at a right angle when the vehicle travels, which causes the backlash of the road surface. In addition, since there are corners in the deleted part of the pavement, there are some points that are prone to breakage from the corners of the surface layer material and have a short life after restoration. Further, since the cut portion of the pavement surface is cut vertically, the load of a vehicle or the like passing over the pavement surface is directly applied to the ground or roadbed material, and the surface layer tends to sink. If the cutting in the depth direction is performed obliquely toward the inside, the load applied to the surface layer material and the like filled later is applied to the existing surface layer material and the roadbed material, etc., and dispersed, making it difficult to sink, Although the adhesion strength between the filled roadbed material and the existing one increases, such an effect cannot be expected.

  In order to solve these problems, the GM round method, the parabola method (registered trademark of Save Machine Co., Ltd. (Registered No. 4748370)) and the Epo method (registered trademark of Hanex Road Co., Ltd. (Registered No. 5086298, A method called Registration No. 4558068)) has been proposed and implemented.

  In the above GM round method, a centering jig is set on the manhole iron lid, and the pavement around the manhole is cut into an arc shape using a dedicated cutter. The cutting is not performed vertically in the depth direction, but is performed in a round shape (in a cross-sectional arc shape) inwardly facing downward. Next, the pavement and earth and sand inside the cutting line are removed. Simultaneously or sequentially, the iron lid and its receiving frame are removed. After this, while adjusting the height and inclination using adjusting materials or adjusting and coupling bolts and nuts, etc., the receiving frame and iron cover are set, and then the ring formed by deleting the surrounding pavement The recess is filled with a dedicated roadbed material, and after waiting for curing for about 20 minutes, a dedicated surface layer material is filled. This surface material is a two-component mixed curing type and can be used in the same manner as an asphalt mixture. The surface material hardens in about 20 minutes, and the road can be opened.

  The GM round method uses a special cutter to cut the pavement into a plane circle, and the cutting is not vertical in the depth direction, but in a round toward the inside, and a material dedicated to the roadbed material and surface layer material. It is characterized in that the curing time is shortened by using. Therefore, a considerable part of the problems of the construction method that has been carried out for a long time is improved.

  The parabola construction method is generally performed in the same manner as the GM round construction method. The same can be said of performing an arc shape around the center of the manhole cover and a round shape toward the inside in the depth direction. The cutter is a dedicated device and is characterized in that it uses a parabolic cutting blade. An annular recess from which the equipment is removed is provided with a non-shrinking mortar after a reinforcing bar is disposed as a roadbed material, and thereafter, a non-shrinking surface layer material is filled thereon.

  Therefore, the advantages of the above parabola method compared with the old technique are almost the same as those of the GM round method.

  The construction method of the EPO method is the same as that of the GM round method. The difference is that the equipment is cut into a circular shape when viewed from the top, but it is cut vertically in the depth direction, and an epoxy resin called ES concrete is mainly used for the annular recess where the equipment is removed. It is filling resin concrete as a component.

  Therefore, the advantages of this epoch method compared to the old technique are the same as those of the GM round method and parabola method, but this epoch method has high durability based on the strength of resin concrete called ES concrete. It is emphasized.

  Patent Document 1 seems to be related to the above-mentioned epoch method, but this is a cutting process in which the fitting is cut into an arc shape around a manhole, and a cutting groove is formed at an arbitrary angle. This is characterized in that it can be performed, and it is difficult to cause problems in the case where it is not described above, that is, problems such as depression after occurrence of recovery, generation of steps, and generation of cracks. An apparatus for this purpose is also provided.

  Patent Document 2 also seems to be related to the EPO method, and relates to a cutting device capable of forming a cutting surface in a slanted shape inclined to the inside of an arc when cutting the fitting in an arc shape around a manhole. Is. As in the case of Patent Document 1, this makes it difficult for a deviation between a new outfit portion and an old outfit portion to occur. The new annular upper layer is supported by the existing lower layer underneath it, thereby avoiding depression, steps, cracks, etc. after restoration as much as possible and extending the life of the manhole. .

JP 07-229158 A JP 09-158114 A

  In the present invention, the GM round method, the parabola method, and the epoch method improved from the old method, and the techniques of Patent Documents 1 and 2 that improved the epoch method are not sufficiently short. It can be shortened, does not require on-site worker skills, and anyone can restore the finish without unevenness, and without using specially expensive materials to fill the manhole support frame and the iron cover removal area around the iron lid. A manhole iron cover and receiving frame replacement method capable of accurately fitting the fitting frame and the installation angle and height of the receiving frame and iron cover to the surrounding road surface and a filling roadbed material used therefor are provided. This is a problem to be solved.

1 of the present invention is a cutting step of cutting a fitting part along a preset closed line surrounding an iron lid of a manhole installed on a road and its receiving frame;
A removal step for removing the inner part of the cutting line formed in the cutting step, the iron lid and its receiving frame,
When the required number of bolts for mounting are fixed upright at the installation position of the receiving frame, and when the receiving frame is attached to the bolt, the bolt penetrates into the bolt through hole of the outer peripheral flange portion of the receiving frame. A bolt fixing and nut screwing process for screwing an adjusting nut having a passive locking piece that can be inserted;
A roadbed material for filling, which is previously integrated with the receiving frame in factory production and molded into a predetermined shape around the receiving frame, of which the receiving frame portion is arranged at the installation position of the receiving frame and is inserted into the bolt through hole of the outer peripheral flange portion. The bolt is penetrated, and the passive locking piece of the adjusting nut is simultaneously inserted into the bolt through hole, while the filling roadbed material part is formed by removing the outfitting part in the removing step, Placed in the recess around the receiving frame installation position so as to be filled, and further lowered the bolt from the outer periphery of the outer periphery of the receiving frame with a nut-shaped rotation auxiliary member without an internal thread on the inner periphery, and lowered, The drive locking piece formed in the lower part is locked to the passive locking piece of the adjustment nut, and the nut-shaped rotation auxiliary member is rotated in either direction to rotate the adjustment nut under the outer peripheral flange portion of the receiving frame. Raise and lower the height and inclination angle of the receiving frame After the nut-like rotation assisting member is removed after being matched with the road surface, a filling base material and a receiving frame for fastening and fixing the receiving frame to the adjusted state by screwing and lowering the tightening nut to the bolt from above Installation process;
A bonding material that fills a bonding material that is coupled between the filling roadbed material and the recess around the receiving frame installation position filled with the filling material and between the receiving frame and the installation position while filling the space between them. Filling process;
Curing process for curing until the binder is cured;
Is a method for exchanging the manhole iron lid and its receiving frame.

  2 of the present invention is the method of replacing the manhole iron cover and its receiving frame according to 1 of the present invention, wherein the filling roadbed material is joined to the receiving frame only at the peripheral end and upper side of the outer peripheral flange portion thereof, In addition, an opening having a diameter larger than that of the bolt through hole communicating with the bolt through hole is provided on the upper side of the outer peripheral flange portion of the receiving frame, and a lower portion is provided at a position corresponding to the bolt through hole below the receiving frame. It is formed into one having flow grooves extending in the radial direction.

  3 of the present invention is the method of replacing the manhole iron cover and its receiving frame according to 1 or 2 of the present invention, wherein the roadbed material for filling is a layer made of a surface layer material in the upper layer and a layer made of the roadbed material in the lower layer. This is what was formed.

According to a fourth aspect of the present invention, in the method for replacing the manhole iron cover and the receiving frame thereof according to the first, second or third aspect of the present invention, the passive locking piece of the adjusting nut is extended from the end of the nut body along the female thread. A cylindrical passive base that extends in a cylindrical shape, and a half passive locking portion that extends from the cylindrical passive base by an angular width of 180 degrees in the circumferential direction,
A cylindrical driving base that extends the driving locking piece of the nut-shaped rotation auxiliary member in a cylindrical shape from the end of the auxiliary member main body along the inner circumference thereof, and an angle of 180 degrees in the circumferential direction from the cylindrical driving base. It is composed of a half-drive engaging portion extended by the width.

According to a fifth aspect of the present invention, in the method for exchanging the manhole iron cover and the receiving frame thereof according to the first, second or third aspect of the present invention, the passive locking piece of the adjusting nut is moved from the end of the nut body along the female thread. A cylindrical passive base extending in a cylindrical shape, and two four-divided passive locking portions extending from the cylindrical passive base at an angular width of 90 degrees in the circumferential direction and at an angular interval between the centers of 180 degrees in the circumferential direction. Consisting of
A cylindrical driving base extending from the end of the auxiliary member main body in a cylindrical shape along the inner periphery thereof, and a further 90 degrees in the circumferential direction from the cylindrical driving base. It is composed of two quadrant drive locking portions extending at an angular width of 180 degrees in the circumferential direction with respect to each other at an angular width.

  According to the manhole iron cover and its receiving frame exchanging method of 1 of the present invention, either the manhole iron cover or the surrounding outfitting centered on the receiving frame is cut into an arc shape or cut along a square side. In addition, the depth direction cut may be either a vertical shape, an inclined shape inclined toward the inner side of the arc or square, or a partial spherical shape with the inner side of the arc or square as the inner side. The recess formed by removing the inner rigging part is filled with a roadbed material for filling that is integrated with a receiving frame that has been produced in the factory in advance, and a thing with sufficient strength is provided from the beginning. Therefore, depending on how the equipment around the manhole cover is cut, even if there are some shortcomings mentioned above (planar square cutting or depth direction vertical cutting), the problem is compensated to a considerable extent. thing Is possible, it is possible to obtain the repair results having sufficiently high strength compared with those by the conventional techniques. In addition, the work is extremely simple, and even an unskilled worker is possible.

  In this method, the recess formed inside the cutting portion is filled with a roadbed material for filling that is integral with a factory-made receiving frame, and the receiving frame is installed in the bolt through hole of the outer peripheral flange. A bolt installed at a position is passed through, and an adjustment nut screwed into a portion below the outer peripheral flange portion of the bolt is rotated up and down from the upper portion of the outer peripheral flange portion using a nut-like rotation auxiliary member. It is possible to adjust the height and inclination to match the surrounding road surface, and at the same time, the roadbed material for filling can also adjust the height and inclination of the upper surface in the same way, causing problems on that surface as well. There is no.

  The adjustment of the height and inclination of the receiving frame will be described more specifically. The passive locking piece of the adjusting nut positioned below the outer peripheral flange of the receiving frame enters the bolt through hole through which the bolt is penetrated, and the nut-shaped rotation auxiliary member positioned above is installed on the bolt. When lowered, the drive locking piece enters the bolt through hole from above and locks with the passive locking piece. If the nut-like rotation auxiliary member is rotated in either direction when it is lowered but not locked, both are further lowered and become locked. Thereafter, if the nut-like rotation auxiliary member is rotated right or left as necessary, the adjustment nut is rotated right or left through the engagement state of the drive engagement piece and the passive engagement piece. Can be raised and lowered. The rotation operation of the nut-shaped rotation auxiliary member is suitably performed using a tool such as a socket wrench. Such lift adjustment by rotating the adjusting nut is performed by the number of bolts screwed with the adjusting bolt. As a result, the height and inclination of the receiving frame and the filling base material molded integrally therewith can be adjusted to match that of the surrounding road surface.

  In addition, as described above, the recess formed by removing the outfitting portion is filled with a filling roadbed material integrated with a receiving frame produced in advance in the factory. Since it is a product to be manufactured, for example, ordinary concrete can be employed as roadbed material, not non-shrinkable concrete, and it is easy to ensure a uniform finish on the surface material.

  Furthermore, as described above, a roadbed material for filling that is integral with the receiving frame is used, and the gap between these and the surrounding portion is filled with an adhesive or a non-shrink mortar and bonded, and should wait for curing. Since there are few elements, the curing time is short and the traffic can be opened earlier than in the conventional method.

  According to the manhole iron cover and the receiving frame replacement method thereof of the present invention, the roadbed material for filling is set together with the central receiving frame in the recess formed for the replacement repair of the iron cover or the like in the surrounding part of the manhole iron cover. Then, when the adhesive or non-shrink mortar is filled in the gap between the filling base material and the periphery thereof, an opening is formed on the outer peripheral flange portion of the receiving frame corresponding to the bolt through hole. It is possible to satisfactorily fill the gap through the part, the bolt through hole and the flow groove. The bolt through-holes are penetrated by using some, not all, of the bolts, and the remaining ones can be used well for injecting adhesive or the like. Even if the bolt is penetrated, the bolt through hole is formed in a long hole, so injection of adhesive etc. using the gap on both sides or one side of the part through which the bolt is penetrated Is possible.

  The adhesive or the like filled below the outer peripheral flange of the receiving frame flows in the radial direction through the flow groove, and can be injected into the entire gap between the filling base material and the periphery thereof. The opening on the outer peripheral flange of the receiving frame is finally filled with an adhesive or the like. However, it is appropriate to fill the uppermost layer with a surface layer material. In addition, when filling with such an adhesive or the like, a mold is disposed at a corresponding portion of the inner periphery of the manhole so that the adhesive or the like does not flow into the manhole from below the receiving frame. Needless to say, should be closed.

  According to the manhole iron cover and the receiving frame exchanging method of the present invention, in the recess formed for exchanging and repairing the iron cover or the like around the manhole iron cover, the central receiving frame is filled together with the central receiving frame. If the roadbed material is filled and adhesive is injected and fixed in the gap between it and the surrounding area, the layer by the surface material similar to the road pavement and the layer by the roadbed material below it are immediately This is very convenient.

  According to the manhole iron cover of 4 or 5 of the present invention and the method for replacing the receiving frame thereof, the recessed portion formed for exchanging and repairing the iron cover or the like around the manhole iron cover is integrated with the central receiving frame. As described above, the passive locking piece of the adjusting nut and the driving locking piece of the nut-like rotation assisting member used when filling the roadbed material for filling and aligning the upper surface level and the inclined state with the road surface, respectively. Thus, the adjustment nut below the receiving frame can be easily rotated and moved up and down by the nut-like rotation auxiliary member positioned above the receiving frame. Moreover, the configuration is simple and has an advantage that it can be easily manufactured.

  The best mode for carrying out the invention will be described in detail with reference to the drawings based on the embodiments.

The manhole iron cover of this embodiment and the method for exchanging its receiving frame are basically:
A cutting step of cutting the outfitting portion along a preset closed line surrounding the manhole iron cover 1 and its receiving frame 2 installed on the road;
A removal step for removing the inner part of the cutting line formed in the cutting step, the iron lid 1 and its receiving frame 2;
When the necessary number of bolts 4, 4... For installation are fixed upright at the installation position 3 of the receiving frame 2 and the receiving frame 2 is attached to the bolts 4, 4. A bolt fixing and nut screwing step for screwing an adjusting nut 5 provided with a passive locking piece 5a that can be inserted into the bolt through holes 2ah, 2ah ... of the outer peripheral flange 2a of the receiving frame 2 through which
A filling roadbed material 6 which is integrated with the receiving frame 2 in advance in factory production and is molded in a predetermined shape around the receiving frame 2, of which the receiving frame 2 portion is disposed at the installation position 3 of the receiving frame 2 and is provided with an outer peripheral flange portion. The bolts 4, 4 ... are passed through the bolt through holes 2ah, 2ah ... of 2a, and the passive locking pieces 5a of the adjusting nut 5 are simultaneously inserted into the bolt through holes 2ah, 2ah ..., The filling roadbed material 6 portion is disposed to fill the recess 7 around the receiving frame installation position 3 formed by removing the outfitting portion in the removing step, and further to the bolts 4, 4. The nut-shaped rotation assisting member 8 having no female screw is externally attached to the inner periphery from the upper side of the outer peripheral flange 2a of the receiving frame 2 and is lowered, and the drive locking piece 8a formed in the lower part is attached to the passive engagement of the adjusting nut 5 The nut-shaped rotation auxiliary member 8 is engaged with the stopper 5a. The nut 5 is rotated in either direction to rotate the adjustment nut 5 below the outer peripheral flange 2a of the receiving frame 2 so that the height and the inclination angle of the receiving frame 2 coincide with the road surface. Removing the member 8, and then screwing and lowering the tightening nut 9 from above to the bolts 4, 4... To fasten and fix the receiving frame 2 in the adjusted state, and a step of installing the receiving frame;
No shrinkage between the filling roadbed material 6 and the recess 7 around the receiving frame installation position 3 filled therewith, and between the receiving frame 2 and the installation position 3 while connecting them together. A binder filling step of filling mortar (binder) m,
Curing process for curing until the non-shrink mortar m is cured,
Are sequentially executed.

  The cutting step is a step of cutting along the preset closed line the mandrel surrounding the manhole iron cover 1 and its receiving frame 2 installed on the road using a cutter device, the closed line being An arc shape is more preferable, but either an arc shape or a square shape can be adopted. In this embodiment, as shown in FIG. 1 (b), cutting is performed along an arcuate line. Further, it is not inconvenient to perform the cutting in the depth direction in the vertical direction, the oblique direction toward the inside of the closed line, or the partial spherical shape, but the latter two are more preferable. In this embodiment, FIG. As shown to (a), it cut | disconnected in the partial spherical surface shape shown last. Since such cutting can be performed by a known apparatus and technique already performed by the GM round method or the parabola method described above, the description thereof is omitted.

  The removal step subsequent to this step is a step of removing the outfitting portion inside the cutting line, the iron lid 1 and its receiving frame 2, and this may be performed by any procedure. It is good also as performing by the GM round construction method, the parabola construction method, the epoch construction method, or the procedure method performed by the technique performed since ancient times. In this embodiment, a member for preventing a fall of the ruptured member of the rigging member is arranged inside the manhole, and then the rigging material and the receiving frame 2 cut from the periphery are lifted and removed. The remaining ruptures of the rigging member are then removed and the interior is cleaned.

The subsequent bolt fixing and nut screwing steps are performed as follows.
The receiving frame 2 to be removed is adjusted in height and angle with bolts and two existing upper and lower nuts, and is fixed with concrete and surrounding roadbed materials, etc., but is similar to the receiving frame 2 and the iron lid 1 In addition, since the bolts and nuts are usually in a state that needs to be replaced due to corrosion or the like, they are also removed in the removing step. Therefore, it is necessary to newly fix the bolts 4, 4... In the upright state at the installation position 3 of the receiving frame 2 at predetermined angular intervals in the circumferential direction. In this embodiment, four bolts 4, 4,... Are raised at an angular interval of 90 degrees in the circumferential direction in correspondence with every other eight bolt through holes 2ah, 2ah,. At the installation position 3 of the receiving frame 2, four pilot holes for bolt installation are opened at such angular intervals, and the bolts 4 are inserted into these pilot holes as shown in FIG. 2 (a). 4... Insert anchor type anchor bolts are driven and fixed.

  Thereafter, the adjusting nut 5 provided with the passive locking pieces 5a is screwed onto the four bolts 4, 4. As shown in FIGS. 2, 3 and 4 (a), 4 (b), the bolts 4, 4... Are screwed so that the passive locking pieces 5a are on the upper side.

  As shown in FIGS. 7 (g) to (i), the adjusting nut 5 includes a nut main body 5b having the same configuration as that of a general nut, and a passive engagement unit that is extended from the end of the nut main body 5b. The passive locking piece 5a includes a cylindrical passive base 5a1 extending in a cylindrical shape along the female screw portion of the nut body 5b, and an angle of 180 degrees in the circumferential direction from the cylindrical passive base 5a1. This is composed of a half-passive locking portion 5a2 extended by the width.

  As described above, after that, the adjusting nut 5 that is positioned below the outer peripheral flange 2a of the receiving frame 2 is rotated by the nut-shaped rotation auxiliary member 8 positioned above the outer peripheral flange 2a. The nut-like rotation assisting member 8 has a drive locking piece 8a having a structure corresponding to the adjusting nut 5, and will be described here.

  As shown in FIGS. 7 (d) to (f), the nut-shaped rotation auxiliary member 8 has a nut-shaped appearance, but has an auxiliary member main body 8b that does not have an internal thread on the inner periphery, and the auxiliary member main body 8b. The driving locking piece 8a is configured to extend from the end of the auxiliary driving body. The driving locking piece 8a extends from the end of the auxiliary member main body 8b in a cylindrical shape along the inner periphery thereof. 8a1 and a half drive locking portion 8a2 further extended from the cylindrical drive base portion 8a1 by an angular width of 180 degrees in the circumferential direction.

Next, an installation process of the filling roadbed material and the receiving frame is performed.
Here, first, the receiving frame 2 is arranged at the installation position 3 and at the same time, the filling roadbed material 6 configured integrally with the receiving frame 2 is formed by removing the outfitting portion in the removing step as described above. The recess 7 around the receiving frame installation position 3 is arranged to be filled.

Here, the receiving frame 2 and the filling roadbed material 6 configured integrally therewith will be described.
The receiving frame 2 has various aspects that are slightly different. In this embodiment, as shown in FIGS. 5 (a), 6 (b), and 6 (c), the cylindrical body 2b and its lower end are provided. 45 degrees in the circumferential direction on the projecting base 2c projecting inward, the outer peripheral flange 2a projecting outward at the lower end, the intermediate flange 2d projecting from the middle of the cylindrical body 2b, and the outer peripheral flange 2a ... Are opened at an angular interval between the central portions of the cylindrical body 2b, the outer periphery of the cylindrical main body 2b and the outer peripheral flange 2a at the intermediate portion between the two adjacent bolt through holes 2ah, 2ah. Are composed of eight stays 2as, 2as... The receiving frame 2 is a cast iron product.

  The bolt through holes 2ah, 2ah... Are openings formed in the shape of a long hole that vertically penetrates the outer peripheral flange 2a, as shown in FIGS. 5 (a) and 6 (c). Even if the adjustment nut 5 screwed to the lower part of the adjusting nut 5 comes into contact therewith and the tightening nut 9 screwed to the adjusting nut 5 comes into contact with the upper part, the entire opening portion is not closed. I can afford.

  The iron lid 1 is basically a disk-like member as shown in FIGS. 5B, 6B, and 6C, and has a concave and convex pattern (not shown) formed on the surface. Further, annular and radial ribs for reinforcement are formed on the back surface. The receiving frame 2 is configured to have a size that fits well in the cylindrical main body 2b. This iron lid 1 is also literally an iron casting.

  Naturally, the filling base material 6 that is integrally connected to the receiving frame 2 is formed into a shape corresponding to the concave portion 7. As described above, the shape of the concave portion can be various, but in this embodiment, the filling roadbed material 6 is formed into a shape based on an annular shape. As shown in FIGS. 5 (a) and 6 (a) to (c), the filling roadbed material 6 is formed on the receiving frame 2 at the peripheral end, the upper surface of the outer peripheral flange 2a, the outer peripheral surface of the cylindrical main body 2b, and the like. Only the stays 2as, 2as... Are connected. Basically, the upper surface is configured to coincide with the upper end of the cylindrical main body 2b of the receiving frame 2, and the bottom surface is positioned slightly below the outer peripheral flange 2a and the overhanging base 2c which are the lowermost parts of the receiving frame 2. The outer periphery is formed in a partial spherical shape so as to substantially match the shape of the corresponding portion of the concave portion 7.

  Further, the filling roadbed material 6 has openings larger in diameter than those communicating with the bolt through holes 2ah, 2ah,. The parts 6a, 6a... Are formed. In this embodiment, as shown in FIGS. 5A and 6C, the openings 6a, 6a... Are opened in a shape that approximates an ellipse that is long in the circumferential direction of the outer peripheral flange 2a. As described above, as shown in FIGS. 6 (b) and 6 (c), members constituting the filling base material 6 have entered under the overhanging base portion 2c and the outer peripheral flange portion 2a of the receiving frame 2. In addition, the inner peripheral end on the lower side of the filling base material 6 coincides with the outer peripheral end of the outer peripheral flange 2a. That is, an annular space 2e is formed below the outer peripheral flange portion 2a and the protruding base portion 2c of the receiving frame 2. Therefore, the openings 6a, 6a,... Communicate with the annular space 2e below the outer peripheral flange 2a and the overhang base 2c through the bolt through holes 2ah, 2ah, which are opened in the outer peripheral flange 2a of the receiving frame 2. It will be.

  Further, on the lower surface side of the filling base material 6, as shown in FIGS. 5 (a) and 6 (a) to (c), it corresponds to each of the bolt through holes 2ah, 2ah,. Flow grooves 6b, 6b,. In this embodiment, since there are the same number as the bolt through holes 2ah, 2ah..., Eight flow grooves 6b, 6b. Moreover, since these flow grooves 6b, 6b... Are configured as described above, they are configured to be extended from the annular space 2e in the radial direction.

  The above-mentioned roadbed material 6 for filling can be formed by a general technique using a mold. The receiving frame 2 is placed upside down at the center of the mold that can be molded into the shape described above, and the material of the roadbed material is put into the mold and molded. Since it is appropriate to use a surface layer material for the uppermost part, first a surface layer material (asphalt mixture) is arranged so that the thickness of the layer is about 50 mm, and then normal concrete is arranged thereon. Like that. In this way, the filling roadbed material 6 is formed, and the upper layer is provided with the surface layer material layer 6x having a thickness of about 50 mm, and the lower layer is provided with the roadbed material layer 6y.

  Thus, the filling roadbed material 6 integral with the receiving frame 2 is manufactured at the factory, and this is shown in FIG. 2 (b) where the receiving frame 2 side is on the installation position 3 of the receiving frame 2. It is arranged so that the roadbed material 6 side for filling is located in the recessed part 7 of the circumference | surroundings. At this time, the receiving frame 2 is inserted through the bolts 4, 4... Standing on the installation position 3 in every other circumferential direction of the bolt through-holes 2 ah, 2 ah. To do. As shown in FIG. 2 (a), the adjustment nut 5 is screwed to the bolts 4, 4... In a vertical relationship such that the passive locking piece 5a is on the upper side. As shown in FIG. 2 (b), the outer peripheral flange portion 2a of the receiving frame 2 is placed on the adjustment nuts 5, 5,. At this time, the passive locking pieces 5a of the adjusting nuts 5, 5... Are inserted into the bolt through holes 2ah and 2ah of the outer peripheral flange 2a as shown in FIG.

  In this state, when the height of the upper end of the cylindrical main body 2b of the receiving frame 2 and the upper surface of the filling base material 6 coincides with the surrounding road surface, and the mutual inclination angles also coincide, they may be left as they are. However, if either or both do not match, the adjustment nuts 5, 5...

  In this case, the nut-like rotation auxiliary member 8 is used. As shown in FIG. 3, the drive locking piece 8 a is turned down and the respective bolts 4, 4... Are covered and lowered, and the drive locking piece 8 a is inserted into the bolt through hole 2 ah of the receiving frame 2. It is made to enter, and this is locked to the passive locking pieces 5a of the adjusting nuts 5, 5,. If the circumferential angle does not match the passive locking pieces 5a of the adjusting nuts 5, 5,..., The nut-shaped rotation assisting member 8 descends when the rotation is slightly performed, and the drive locking pieces 8a. As shown in FIG. 3 and FIG. 4 (a), it is locked with the passive locking piece 5a.

  In this state, as shown in FIG. 3 and FIG. 4 (a), if the nut-shaped rotation assisting member 8 is rotated clockwise or counterclockwise using an appropriate socket wrench w, the rotation will be performed by itself. It is transmitted to the adjustment nut 5 via the drive engagement piece 8a and the passive engagement piece 5a engaged with the drive engagement piece 8a, and the adjustment nut 5 can be moved up and down. If the adjustment nuts 5, 5... Screwed into the four bolts 4, 4... Are appropriately lifted and lowered as described above, the receiving frame 2 and the filling roadbed material 6 integrated with the receiving frame 2 are integrated. The upper surface and its inclination angle can be made to coincide with the surrounding road surface.

  Thereafter, the nut-like rotation assisting members 8, 8... Are removed, and as shown in FIG. 4 (b), the tightening nuts 9, 9 ... are screwed down to the respective bolts 4, 4 ... It tightens appropriately and fixes the height and inclination state of the receiving frame 2 and the roadbed material 6 for tree turning. The tightening nuts 9, 9... Are nuts having a partially spherical bulged portion 9a on the front surface as shown in FIGS. 4 (b) and 7 (a) to (c).

  After the filling base material and the receiving frame installation process are completed in this way, the binder filling process is executed. The adhesive or non-shrink mortar m is injected from the eight openings 6a, 6a... Of the filling roadbed material 6 opened at the upper part of the receiving frame 2, and below the receiving frame 2 and each part of the filling roadbed material 6. In this embodiment, the non-shrink mortar m is injected. Prior to this, the opening portion of the annular space 2e between the projecting base 2c of the receiving frame 2 that opens into the manhole and the installation position 3 of the receiving frame 2 below it is closed by contacting an appropriate sheet material. I will leave it.

  Thereafter, as described above, the non-shrinking mortar m is filled from the openings 6a, 6a... Opened on the outer peripheral flange 2a of the receiving frame 2. The non-shrink mortar m flows into the annular space 2e below the bolts through holes 2ah, 2ah ... opened from the openings 6a, 6a ... to the outer peripheral flange 2a. Of the eight bolt through holes 2ah, 2ah, etc., the four bolts 4, 4,... Pass through, and the adjustment nuts 5, 5,. Even so, the bolt through holes 2ah, 2ah... Have a slight opening margin, so that the non-shrink mortar m flows into the annular space 2e below the bolt through holes 2ah, 2ah.

  The non-shrinking mortar m that has flowed into the annular space 2e below the outer peripheral flange portion 2a and the overhanging base portion 2c of the receiving frame 2 has flow grooves 6b, 6b,. The fluid flows in the radial direction through and spreads over the entire lower surface of the filling roadbed material 6. Further, the excess amount of the non-shrink mortar m flowing into the flow grooves 6b, 6b... Overflows from the flow grooves 6b, 6b. . Thus, as shown in FIGS. 9 (a) and 9 (b), the gap between the filling roadbed material 6 and the periphery thereof is filled with the non-shrinking mortar m, and the filling roadbed material 6 and the receiving frame 2 The fixing to the concave portion 7 or the installation position 3 at an appropriate height and inclination angle can be ensured. After the non-shrink mortar m is cured, the sheet material is removed from the opening portion of the annular space 2e on the inner surface of the manhole.

  In this embodiment, in the above, the non-shrink mortar m was used for the final thickness of 50 mm filled in the openings 6a, 6a... Of the filling roadbed material 6. It is possible to use a surface layer material (asphalt mixture) instead of the non-shrink mortar m, which is more appropriate.

  The road is closed during the above-described method, but is opened after the non-shrink mortar m is cured. As described above, since the amount of the non-shrinkable mortar m to be used is very small, the time until curing is short and the time for blocking traffic is extremely short. The curing process until the non-shrink mortar m is cured is performed simply by leaving it alone.

  Thus, the manhole iron lid and the receiving frame replacement method of this embodiment are completed.

Below, the adjustment nut 15 and the nut-shaped rotation auxiliary member 18 which can be used instead of the adjustment nut 5 and the nut-shaped rotation auxiliary member 8 of the above Example are demonstrated.
First, the adjustment nut 15 will be described. As shown in FIGS. 8D to 8F, this is a nut main body 15b having the same configuration as a general nut, and an extended state from the end of the nut main body 15b. The passive locking piece 15a includes a cylindrical passive base 15a1 extending in a cylindrical shape from the end of the nut body 15b along the female screw portion, and the cylindrical passive base. Further, the four-part passive locking portions 15a2 and 15a2 each extending from 15a1 with an angular width of 90 degrees in the circumferential direction and extending at an angular distance between the centers of 180 degrees in the circumferential direction.

  As shown in FIGS. 8A to 8C, the nut-shaped rotation auxiliary member 18 includes an auxiliary member main body 18b having a nut-shaped appearance but not having an internal thread on the inner periphery, and the auxiliary member main body 18b. The driving locking piece 18a is configured to be extended from the end portion, and the driving locking piece 18a includes a cylindrical driving base portion 18a1 extending in a cylindrical shape from the end portion of the auxiliary member main body 18b along the inner periphery thereof. The cylindrical drive base 18a1 further includes two four-part drive locking portions 18a2 and 18a2 each extending at an angular width of 90 degrees in the circumferential direction and at an angular interval between the centers of 180 degrees in the circumferential direction. .

  Accordingly, if the above adjustment nut 15 is used in the same manner as the adjustment nut 5 and the nut-like rotation auxiliary member 18 is used in the same manner as the nut-like rotation auxiliary member 8, respectively, as shown in FIGS. 8 (g) and 8 (h). When the latter drive locking piece 18a is locked to the former passive locking piece 15a and the auxiliary member body 18b of the latter nut-shaped rotation auxiliary member 18 is rotated using a socket wrench w, the drive locking piece It becomes possible to rotate the adjustment nut 15 via 18a and the passive locking piece 15a, and it can function like the adjustment nut 5.

  The adjusting nuts 5 and 15 and the nut-like rotation assisting members 8 and 18 are operated in the axial direction with respect to the passive locking pieces 5a and 15a and the driving locking pieces 8a and 18a. Any configuration can be adopted as long as it has a relationship that can be locked with each other and that can transmit the driving force in the rotational direction to each other.

  According to the manhole iron cover and the receiving frame replacement method of this embodiment, the iron cover 1 and the receiving frame 2 can be replaced in a short time as described above, and the replacement work can be easily performed even by an unskilled person. It can be performed efficiently and uniformly. It is also economical.

(a) is a schematic cross-sectional view of the manhole and its periphery after the removal step of the embodiment, (b) is a schematic plan view. (a) is a schematic cross-sectional view of the manhole and its surroundings after the bolt fixing and nut screwing process of the embodiment, (b) is a filling roadbed material and receiving frame in the installation process of the filling roadbed material and receiving frame of the embodiment. The schematic sectional drawing which shows the stage which has arrange | positioned. In the installation process of the roadbed material for filling and the receiving frame of the embodiment, a state in which the nut-shaped rotation auxiliary member is externally mounted on the bolt and the lower drive locking piece is locked to the passive locking piece of the lower adjustment nut is shown. FIG. (a) is an enlarged view of the nut-shaped rotation auxiliary member and the adjustment nut in FIG. 3, and (b) is an enlarged view showing a state in which the nut-shaped rotation auxiliary member of (a) is removed and a tightening nut is screwed. (a) is a plan view of a state in which an iron lid of a roadbed material for filling formed integrally with a receiving frame is removed, and (b) is a plan view of the iron lid. (a) is a front view of a roadbed material for filling formed integrally with a receiving frame, (b) is a cross-sectional view, and (c) is a bottom view in a state where an iron lid is arranged. (a) is a side view of the tightening nut, (b) is a cross-sectional view of the tightening nut, (c) is a front view of the tightening nut, (d) is a side view of the nut-like rotation auxiliary member, and (e) is (F) is a front view of the nut-shaped rotation auxiliary member, (g) is a side view of the adjustment nut, (h) is a cross-sectional view of the adjustment nut, and (i) is a front view of the adjustment nut. Figure. (a) is a side view of a nut-like rotation auxiliary member of another embodiment, (b) is a cross-sectional view of a nut-like rotation auxiliary member of another embodiment, and (c) is a nut-like rotation auxiliary member of another embodiment. (D) is a side view of an adjustment nut of another embodiment, (e) is a cross-sectional view of the adjustment nut of another embodiment, (f) is a front view of the adjustment nut of another embodiment, ( g) is a side view of a state in which the driving locking piece of the nut-shaped rotation assisting member of the other embodiment and the driven locking piece of the adjustment nut are locked, and (h) is the nut-shaped rotation auxiliary of the other embodiment. Sectional drawing of the state which latched the driving locking piece of the member, and the driven locking piece of the adjustment nut. (a) is a cross-sectional view of the manhole and the vicinity of the receiving frame when the receiving frame is completely replaced, and (b) is an enlarged partial cross-sectional view of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Iron cover 2 Receiving frame 2a Outer peripheral flange 2ah Bolt through-hole 2as Stay 2b Cylindrical main body 2c Overhang base 2d Intermediate flange 2e Annular space 3 Receiving frame installation position 4 Bolt 5 Adjustment nut 5a Passive locking piece 5a1 Cylindrical passive base 5a2 Half-divided passive locking portion 5b Nut body 6 Filling roadbed material 6a Opening 6b Flow groove 6x Surface layer material layer 6y Roadbed material layer 7 Recessed portion 8 Nut-shaped rotation auxiliary member 8a Drive locking piece 8a1 Cylindrical drive base 8a2 Half-cut Drive locking portion 8b Auxiliary member main body 9 Clamping nut 9a Swelling portion 15 Adjustment nut 15a Passive locking piece 15a1 Cylindrical passive base 15a2 Four-part passive locking portion 15b Nut body 18 Nut-shaped rotation auxiliary member 18a Drive locking piece 18a1 Tubular drive base 18a2 4 split drive lock 18b Auxiliary member body m Non-shrink mortar (binding material)
w Socket wrench

Claims (5)

A cutting step of cutting the outfitting portion along a preset closed line surrounding the iron cover of the manhole installed on the road and its receiving frame;
A removal step for removing the inner part of the cutting line formed in the cutting step, the iron lid and its receiving frame,
When the required number of bolts for mounting are fixed in an upright state at the installation position of the receiving frame, and the receiving frame is attached to the bolt, the bolt penetrates into the bolt through hole of the outer peripheral flange portion of the receiving frame. A bolt fixing and nut screwing process for screwing an adjusting nut having a passive locking piece that can be inserted;
A roadbed material for filling, which is previously integrated with the receiving frame in factory production and molded into a predetermined shape around the receiving frame, of which the receiving frame portion is arranged at the installation position of the receiving frame and is inserted into the bolt through hole of the outer peripheral flange portion. The bolt is penetrated, and the passive locking piece of the adjusting nut is simultaneously inserted into the bolt through hole, while the filling roadbed material part is formed by removing the outfitting part in the removing step, Placed in the recess around the receiving frame installation position so as to be filled, and further lowered the bolt from the outer periphery of the outer periphery of the receiving frame with a nut-shaped rotation auxiliary member without an internal thread on the inner periphery, and lowered, The drive locking piece formed in the lower part is locked to the passive locking piece of the adjustment nut, and the nut-shaped rotation auxiliary member is rotated in either direction to rotate the adjustment nut under the outer peripheral flange portion of the receiving frame. Raise and lower the height and inclination angle of the receiving frame After the nut-shaped rotation auxiliary member is removed after being matched with the road surface, the filling base material and the receiving frame for fastening and fixing the receiving frame in the above-mentioned adjusted state by screwing and lowering the tightening nut from above to the bolt are installed. Process,
A bonding material that fills a bonding material that is coupled between the filling roadbed material and the recess around the receiving frame installation position filled with the filling material and between the receiving frame and the installation position while filling the space between them. Filling process;
Curing process for curing until the binder is cured;
The manhole iron lid and the receiving frame replacement method for sequentially executing the above.   The filling base material is connected to the receiving frame only at the peripheral end and upper side of the outer peripheral flange portion, and the bolt through hole communicated with the bolt through hole on the upper side of the outer peripheral flange portion of the receiving frame. The manhole iron cover according to claim 1, further comprising a larger-diameter opening, and further formed with a flow groove extending radially from a position corresponding to a bolt through hole below the receiving frame. method of exchange.   3. The manhole iron cover and its receiving frame replacement method according to claim 1 or 2, wherein the filling roadbed material has an upper layer formed of a surface layer material and a lower layer formed of a roadbed material layer. The passive locking piece of the adjusting nut is extended in a cylindrical shape from the end of the nut main body along the female screw portion, and further extended from the cylindrical passive base by an angular width of 180 degrees in the circumferential direction. With a half-way passive locking part,
A cylindrical driving base that extends the driving locking piece of the nut-shaped rotation auxiliary member in a cylindrical shape from the end of the auxiliary member main body along the inner circumference thereof, and an angle of 180 degrees in the circumferential direction from the cylindrical driving base. 4. The manhole iron cover according to claim 1, 2 or 3, comprising a half-drive engaging portion extended by a width, and a method for replacing the receiving frame. A passive locking piece of the adjusting nut is connected to a cylindrical passive base extending in a cylindrical shape from the end of the nut body along the female threaded portion, and from the cylindrical passive base to each other at an angular width of 90 degrees in the circumferential direction. It is composed of two four-part passive locking portions extended at an angular interval between the centers of 180 degrees in the circumferential direction,
A cylindrical driving base extending from the end of the auxiliary member main body in a cylindrical shape along the inner periphery thereof, and a further 90 degrees in the circumferential direction from the cylindrical driving base. 4. The manhole iron cover and its receiving frame replacement method according to claim 1, 2, or 3, comprising two four-part drive locking portions extending at an angular width of 180 degrees in the circumferential direction with respect to each other at an angular width.

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