JP3813843B2 - Overlay method, cutting overlay method and pavement method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an overlay method, a cutting overlay method, and a pavement method that include adjusting or setting the bulk height of a manhole frame.
[0002]
[Prior art]
If the pavement surface is cracked and damaged, and the pavement thickness becomes insufficient for vehicle traffic, and if the manhole frame protrudes from the pavement surface and steps are created around it, vibration and noise associated with vehicle traffic will occur. As the road spreads to the roadside environment, safe and smooth traffic of vehicles and pedestrians is hindered, which may lead to serious traffic accidents. Therefore, in such a case, the manhole frame is raised to a predetermined height, and a new surface layer (overlay) of the required thickness is directly applied to the current pavement surface (overlay method), or the current After cutting the pavement surface by the required thickness, the height of the manhole frame is adjusted, and a new surface layer of the required thickness is constructed on the cut surface (cutting overlay method), thereby repairing the road The step around the manhole frame can be eliminated.
[0003]
However, in the conventional overlay method and the cutting overlay method, when overlaying is performed, the overlay is made to be flush with the upper surface of the manhole frame whose height has been adjusted due to the vertical and horizontal gradients generated on the road. It is difficult in terms of construction technology to accurately align the surface, and it is easy for discrepancies to occur, and the manhole frame protruding from the pavement surface becomes an obstacle to smooth surface construction by the surface pavement machine, and after height adjustment Since the manhole frame protrudes from the pavement surface and creates a step around it, it is necessary to relieve the step by, for example, newly rubbing the stepped part around the manhole frame when opening traffic during construction. There was a problem.
[0004]
In the case of the cutting overlay method, since the cutting process is performed before the overlay construction, in addition to the problems associated with the overlay construction described above, the manhole frame is smoothly cut by the cutting machine when cutting the pavement surface. There is also the problem of becoming an obstacle. Therefore, it is possible to carry out cutting and overlay construction on the pavement surface very easily and with good workability without being obstructed by the manhole frame, and it is possible to easily align the upper surface of the manhole frame and the overlay surface when constructing the overlay. In addition, a cutting overlay method has already been developed (see Japanese Patent Nos. 2623490 and 2623491).
[0005]
On the other hand, in the pavement method that newly installs and replaces pavements including the installation of manhole frames, conventionally, the manhole frames are adjusted to the height of the pavement surface that is planned to be installed on the manhole base wall on the pavement surface via the installation foundation. After being installed, the paving material is driven to the height. However, in such a conventional pavement method, the manhole frame protrudes upward when the pavement material is placed, creating a step around it, and hinders smooth pavement construction by the paving machine, especially for pavement near the manhole frame. Insufficient compaction due to insufficient rolling pressure, and the surface layer in the final stage of pavement construction, the height of the manhole frame adjusted to the height due to the vertical and horizontal gradients on the road It is difficult in terms of construction technology to accurately align the surface of the surface so that it is in the same plane, and there are problems such as discrepancies and the manhole frame obstructing smooth surface construction by the surface paving machine. It was.
[0006]
Therefore, a pavement method has been developed that can perform pavement construction on the paved road surface very easily and efficiently without being obstructed by the manhole frame, and can easily align the upper surface of the manhole frame with the pavement surface. (See Japanese Patent No. 2623492).
[0007]
[Problems to be solved by the invention]
In the conventional overlay method (Patent No. 2623490), cutting overlay method (Patent No. 2623491) and pavement method (Patent No. 2623492) including adjusting the height of the manhole frame or installing it, for manhole frame or temporary installation When removing the support lid, the surrounding pavement is cut into a cylindrical shape from the final pavement surface (in the case of the overlay method, it means the overlay surface; the same shall apply hereinafter). There is a drawback that the occurrence of this is forced.
[0008]
Also, in each of the above conventional methods, a manhole frame mounting base is constructed on the manhole base wall, and the manhole frame is installed on the mounting base. In order to accurately match the surface of the pavement, it is necessary to finely adjust the thickness of the mounting foundation, and there is a drawback that the height adjustment work of the manhole frame on the site is very complicated. Furthermore, in each of the above conventional methods, since all the cavity around the manhole frame is filled with the pavement material, the pavement material is hardened in a state of being wound around the manhole frame more thickly than the same frame. . For this reason, when performing road repair without raising the manhole frame next time, if it is necessary to remove the surface layer such as overlay and expose the manhole frame to that point (kiwa), the pavement material around the manhole frame However, there is also a drawback that it is very difficult to carry out the fishing work.
[0009]
In view of such a situation, the present invention can shorten the generation time of noise during the construction period as much as possible, can extremely easily adjust the height of the manhole frame, and further, manholes for the next road repair An object of the present invention is to provide an overlay method, a cutting overlay method, and a pavement method including adjusting the height of a manhole frame or installing a manhole frame that can be easily suspended around the frame.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention takes the following technical means. That is, the present invention is an overlay method, a cutting overlay method and a pavement method including a manhole frame bulk height adjustment or installation,
(i) Conventionally, the pavement around the manhole frame is cut and removed from the final pavement surface (overlay surface or new pavement surface) into a cylindrical shape. In the present invention, the manhole frame (or support frame) is removed. By forcibly pulling up with a lifter, the surrounding pavement was removed without cutting in advance ,
(ii) In the past, a manhole frame installation base was constructed on the manhole base wall, and the manhole frame was installed on the installation base.In the present invention, the holding frame is fixed to the upper surface of the manhole frame, The manhole frame is set to float above the manhole base wall so that the tip of the holding frame is brought into contact with the final pavement surface (overlay surface or new pavement surface), and
(iii) In the past, the entire cavity around the manhole frame was filled with pavement material, but the cavity around the manhole frame was filled in two layers: foundation concrete for installation and pavement material. The construction methods of the present invention are essentially different from the conventional construction methods in these respects.
[0011]
In the present invention, the manhole frame (or support frame) is forcibly pulled upward with a lifter, so that the surrounding pavement portion is removed without being cut in advance . Generation of noise associated with cutting work is eliminated, and noise generation time during the construction period can be shortened as much as possible. In addition, as a lifter that can forcibly pull out the manhole frame (or support frame) together with the surrounding pavement without generating almost any noise, for example, a lid receiving frame pull-out described in registered utility model No. 3010469 You can use the machine.
[0012]
Further, in the present invention, the holding frame is fixed to the upper surface of the manhole frame, and the manhole frame is set above the manhole base wall so that the tip of the holding frame is in contact with the final pavement surface. Therefore, when the holding frame is brought into contact with the surface of the final pavement surface, the upper surface of the manhole frame automatically matches the final pavement surface. For this reason, the conventional troublesome work of adjusting the thickness of the installation foundation is unnecessary, and the height adjustment work of the manhole frame can be performed very easily.
[0013]
Furthermore, in the present invention, the cavity around the manhole frame is filled in two layers of foundation concrete for installation and pavement material, so the next time the road is repaired without raising the manhole frame. When it is necessary to remove the surface layer such as overlay and expose the manhole frame to that point (kiwa), the pavement material on the foundation concrete can be swept relatively easily from there, so that the next road The suspension work around the manhole frame during repair can be easily performed.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 are cross-sectional views of a pavement showing the overlay method according to the first embodiment of the present invention in time series. Among these sectional views, FIG. 1A is an overlay process, FIG. 1B is a manhole frame drawing process, FIG. 2C is a manhole frame setting process, and FIG. 2D is foundation concrete and finishing. The pavement filling process is shown. Hereinafter, the overlay method of the present embodiment will be described separately for each of these steps.
[0015]
[Overlay process]
As shown in FIG. 1 (a), in the overlay method of the present embodiment, as a pretreatment, a circular roadbed paper having the same diameter as or slightly larger than the surface of the lid 2 of the manhole frame 1 or the like. Next, the overlay 5 of the required thickness including the release material 3 is tucked on the surface of the current pavement 4 to be repaired without bypassing the manhole frame 1. (Not shown) and the like. That is, the overlay 5 is applied to the surface of the pavement 4 to be repaired without bypassing the manhole frame 1, and the manhole frame 1 is once covered with the overlay 5 together with the surface of the pavement 4. The release material 3 is used later to facilitate peeling of the overlay 5 from the surface of the manhole cover 2. Examples of the release material 3 include various agents such as a release treatment agent and a roadbed. Various sheets such as paper can be used.
[0016]
[Manhole frame drawing process]
Subsequent to the overlay process, the process proceeds to the next manhole frame 1 extraction process. In order to perform the extraction, it is necessary to remove the manhole cover 2 and open the manhole frame 1. Therefore, after the overlay method is completed, the overlay 5 on the manhole cover 2 is removed by a hand breaker or the like (not shown), and the manhole cover 2 is removed from the manhole frame 1. Next, as shown in FIG. 1B, the manhole frame 1 is forcibly pulled upward by the lifter 12 so that the pavement portion 7 around the manhole frame 1 is not cut in advance together with the manhole frame 1. It will be removed. In FIG. 1B, reference numeral 8 denotes a spacer interposed between the lower surface of the manhole frame 1 and the upper surface of the manhole base wall 6.
[0017]
Forcibly pulling out the manhole frame 1 and the surrounding pavement portion 7 generates almost noise if the hydraulic lid receiving frame pulling machine described in the registered utility model No. 3010469 is used. The manhole frame 1 can be removed without any trouble. But you may use apparatuses other than this drawing machine. In FIG. 1B, the hooking claw of the lifter 12 is hooked on the lower surface side of the spacer 8, but the hooking hook is hooked on the stepped portion formed on the inner peripheral portion of the manhole frame 1, The manhole frame 1 can also be pulled out.
[0018]
[Manhole frame setting process]
Thereafter, as shown in FIG. 2 (c), the holding frame 13 is fixed to the upper surface of the manhole frame 1, and the manhole frame 1 is fixed to the manhole base so that the tip of the holding frame 13 is brought into contact with the surface of the overlay 5. It is set in a state of floating above the wall 6, and the gap between the manhole frame 1 and the manhole base wall 6 is filled with the inner mold frame 14. The holding frame 13 of the present embodiment includes a frame main body 15 formed in a ring shape having substantially the same diameter as the receiving portion of the manhole frame 1 and a plurality of abutting projections radially projecting radially outward from the frame main body 15. A contact arm 16 is provided, and the contact arm 16 is fixed to the frame body 15 so that the lower surface thereof is flush with the lower surface of the frame body 15.
[0019]
The holding frame 13 includes a suspension mechanism for fixing the manhole frame 1 in a suspended state on the lower surface side of the frame main body 15, and the suspension mechanism moves the contact arm 16 in the vertical direction. It comprises a fastening bolt 17 that penetrates and a latch 18 with a nut that can be hooked on the lower flange of the manhole frame 1. Therefore, after the frame body 15 of the holding frame 13 is overlaid on the receiving portion of the manhole frame 1 and the latch 18 is hooked on the lower flange of the manhole frame 1, the lower end of the fastening bolt 17 is attached to the nut of the latch 18. The holding frame 13 can be fixed to the manhole frame 1 in a state where the upper surface of the manhole frame 1 (the upper edge surface of the receiving port portion) is at the same level as the lower surface of the contact arm 16 by inserting and tightening the portion. It has become.
[0020]
For this reason, by storing the manhole frame 1 to which the holding frame 13 is fixed as described above in the extraction hole of the pavement 4, the tip end portion (contact arm 16) of the holding frame 13 contacts the surface of the overlay 5. In this state, the manhole frame 1 is set in a state where it floats above the manhole base wall 6. At this time, the upper surface of the manhole frame 1 exactly matches the surface of the overlay 5. The inner mold frame 14 for filling the gap between the manhole frame 1 and the manhole base wall 6 is composed of a rubber band having a width wider than the gap height. In addition, the manhole frame 1 installed in the manhole frame setting process can be diverted if the old frame removed from the repaired pavement 4 in the drawing process still withstands use, otherwise Replace with a new manhole frame.
[0021]
[Filling process of basic concrete and finishing pavement]
Next, as shown in FIG. 2 (d), of the hollow portion around the manhole frame 1, a portion having a height higher than the lower surface of the manhole frame 1 from the upper surface of the manhole base wall 6 is made of, for example, instantaneous mortar or the like. A foundation concrete 9 for solidifying is cast in the field. It should be noted that the placement level of the foundation concrete 9 should be at least the lower surface of the manhole frame 1, but if all the lower flanges of the manhole frame 1 are embedded in the foundation concrete 9, the concrete 9 The root-strengthening strength by can be fully exhibited.
[0022]
Thereafter, the holding bolt 13 is removed from the manhole frame 1 by loosening the tightening bolts 17 and removing the fastening bolts 18, and after the foundation concrete 9 is cured, the inner mold 14 is removed. Finally, in the cavity around the manhole frame 1, the pavement material 10 is placed in a portion from the upper surface of the foundation concrete 9 to the height of the surface of the overlay 5, thereby completing the entire process. As described above, in the overlay method of the present embodiment, the cavity around the manhole frame 1 is filled in two layers of the foundation concrete 9 for installation and the pavement material 10, so that the manhole frame 1 is next filled. When it is necessary to remove the overlay 5 and expose the manhole frame 1 at that time (kiwa) when performing road repair without raising the floor, it is relatively easy to remove the pavement 10 on the foundation concrete 9 from there. Therefore, the suspension work around the manhole frame 1 at the time of the next road repair can be easily performed.
[0023]
In addition, according to the present embodiment, first, the concrete around the manhole frame 1 is filled with the foundation concrete 9 so that the manhole frame 1 is solidified with respect to the foundation concrete 9 and then the pavement material 10 is filled. Therefore, it is not necessary to connect the manhole frame 1 to the manhole base wall 6 via a fixing member such as an anchor bolt in order to prevent the manhole frame 1 from being misaligned. There are also advantages. However, if there is a problem with the supporting strength around the manhole frame 1 with the initial hardening strength of the foundation concrete 9, the manhole base wall 6 and the manhole frame 1 are connected with a fixing member such as an anchor bolt, and then the foundation concrete 9 May be filled.
[0024]
In particular, as shown in FIG. 2D, if the thickness of the pavement material 10 to be placed last is set to be substantially the same as the thickness of the overlay 5, the overlay 5 will be used for the next road repair. Since the pavement material 10 around the manhole frame 1 can be hung with the same tone as the hanging work, the hanging work around the manhole frame 1 at the time of the road repair becomes easier. 3-5 is sectional drawing of the pavement which shows the cutting overlay construction method which is 2nd embodiment of this invention in time series. Of these sectional views, FIG. 3 (a) is a manhole frame drawing process, FIG. 3 (b) is a temporary restoration pavement filling process, FIG. 4R> 4 (c) is a cutting and overlay process, and FIG. 4 (d). FIG. 5 (e) shows a manhole frame setting process, and FIG. 5 (f) shows a foundation concrete and finishing pavement filling process. Hereinafter, the cutting overlay method of the present embodiment will be described separately for each of these steps. In the second embodiment, members having the same functions or structures as those of the first embodiment are denoted by the same reference numerals in the drawings, and detailed description thereof is omitted.
[0025]
[Manhole frame drawing process]
In the cutting overlay method of the present embodiment, first, as shown in FIG. 3A, by using the lifter 12 to forcibly pull the manhole frame 1 upward, a pavement around the manhole frame 1 is obtained. 7 is removed together with the manhole frame 1 without being cut in advance .
[Temporary Restoration Pavement Filling Step] Next, as shown in FIG. 3B, on the manhole base wall 6, a support frame 20 made of a circular ring made of iron, and a support lid fitted in the support frame 20 21 is temporarily installed, and a paving material 22 for temporary restoration is placed in the cavity around the support lid 21 to the same level as the old pavement 4 to be repaired. In the present embodiment, the pavement material 22 can be easily separated from the support lid 21 by pasting the release material 3 on the upper surface of the support lid 21.
[0026]
[Cutting and overlay process]
Next, as shown in FIG. 4C, the surface of the pavement 4 to be repaired is cut including the surface of the pavement 7 on the manhole base wall 6, and the required thickness is applied to the cutting surface 23. The overlay 5 is applied via a tack coat (not shown).
[Support frame extraction process]
Subsequent to the overlaying process, the process proceeds to the next drawing process of the support frame 20. In order to perform the drawing, it is necessary to remove the support lid 21 and open the support frame 20. Therefore, after the overlay method is completed, the overlay 5 and the temporary restoration pavement material 22 on the support lid 21 are removed by a hand breaker or the like (not shown), and the support lid 21 is removed from the support frame 20.
[0027]
Next, as shown in FIG. 4 (d), the support frame 20 is forcibly pulled upward by the lifter 12, so that the pavement portion 24 around the support frame 20 is not cut in advance and the support frame 20 is removed. It is removed with it.
[Manhole frame setting process]
Thereafter, as shown in FIG. 5 (e), the holding frame 13 is fixed to the upper surface of the manhole frame 1, and the manhole frame 1 is fixed to the manhole base so that the front end of the holding frame 13 is brought into contact with the surface of the overlay 5. It is set in a state of floating above the wall 6, and the gap between the manhole frame 1 and the manhole base wall 6 is filled with the inner mold frame 14.
[0028]
[Filling process of basic concrete and finishing pavement]
Next, as shown in FIG. 5 (f), of the hollow portion around the manhole frame 1, a portion having a height higher than the upper surface of the manhole base wall 6 and the lower surface of the manhole frame 1 is made of, for example, instantaneous mortar. The foundation concrete 9 for solidifying is cast in-situ, and the holding frame 13 is removed from the manhole frame 1 by loosening the fastening bolts 17 and removing them from the retaining brackets 18. Then, after the foundation concrete 9 is hardened, the inner mold 14 is demolded. Finally, in the cavity around the manhole frame 1, the pavement material is formed from the upper surface of the foundation concrete 9 to the height of the surface of the overlay 5. 10 is placed, which completes the whole process.
[0029]
FIG.6 and FIG.7 is sectional drawing of the pavement which shows the pavement construction method including installation of the manhole frame which is 3rd embodiment of this invention in time series. Among these sectional views, FIG. 6 (a) is a new installation or replacement pavement process, FIG. 6 (b) is a support frame drawing process, FIG. 7 (c) is a manhole frame setting process, and FIG. The filling process of basic concrete and finishing pavement is shown. Hereinafter, the overlay method of the present embodiment will be described separately for each of these steps. In the third embodiment, members having the same functions or structures as those in the first and second embodiments are denoted by the same reference numerals in the drawings, and detailed description thereof is omitted.
[0030]
[New construction or replacement paving process]
First, as shown in FIG. 6A, a support lid 21 with the support frame 20 described above is temporarily installed on the manhole base wall 6 in the paved road surface 26, and the support lid is provided on the paved road surface 26. A pavement 27 for new installation or replacement including the surface of 21 is constructed.
[0031]
[Support frame extraction process]
Subsequent to the paving process, the process proceeds to the next drawing process of the support frame 20. In order to perform the drawing, it is necessary to remove the support lid 21 and open the support frame 20. Therefore, after the pavement method is finished, the pavement 27 on the support lid 21 is removed by a hand breaker or the like (not shown), and the support lid 21 is removed from the support frame 20.
[0032]
Next, as shown in FIG. 6B, the support frame 20 is forcibly pulled upward by the lifter 12, so that the pavement portion 24 around the support frame 20 is not cut in advance and the support frame 20. It is removed with it.
[Manhole frame setting process]
Thereafter, as shown in FIG. 7 (c), the holding frame 13 is fixed to the upper surface of the manhole frame 1, and the manhole is made so that the tip of the holding frame 13 is brought into contact with the surface of the newly installed or replaced pavement 27. The frame 1 is set in a state of floating above the manhole base wall 6, and the gap between the manhole frame 1 and the manhole base wall 6 is filled with the inner mold frame 14.
[Filling process of basic concrete and finishing pavement]
Next, as shown in FIG. 7 (d), of the hollow portion around the manhole frame 1, a portion having a height higher than the lower surface of the manhole frame 1 from the upper surface of the manhole base wall 6 is made of, for example, instantaneous mortar. The foundation concrete 9 for solidifying is cast in-situ, and the holding frame 13 is removed from the manhole frame 1 by loosening the fastening bolts 17 and removing them from the retaining brackets 18. Then, after the foundation concrete 9 is cured, the inner mold 14 is removed, and finally, from the upper surface of the foundation concrete 9 to the height of the surface of the newly installed or replaced pavement 27 in the cavity around the manhole frame 1. The pavement material 10 is placed on this part, and this completes the entire process.
[0033]
【The invention's effect】
As described above, according to the present invention, when performing the overlay method including the height adjustment or installation of the manhole frame, the cutting overlay method and the pavement method, the generation time of noise during the construction period can be shortened as much as possible. The manhole frame height adjustment operation can be performed very easily, and the suspension work around the manhole frame during the next road repair can be easily performed.
[Brief description of the drawings]
FIGS. 1A and 1B are cross-sectional views of a pavement showing the overlay method of the present invention in time series, wherein FIG. 1A shows an overlay process, and FIG. 1B shows a manhole frame drawing process.
FIG. 2 is a cross-sectional view of a pavement showing the overlay method of the present invention in time series, (c) shows a manhole frame setting process, and (d) shows a filling process of basic concrete and finished pavement material.
FIGS. 3A and 3B are cross-sectional views of a pavement showing the cutting overlay method of the present invention in time series, wherein FIG. 3A shows a manhole frame drawing process, and FIG. 3B shows a temporary restoration pavement filling process.
FIG. 4 is a cross-sectional view of a pavement showing the cutting overlay method of the present invention in time series, (c) shows a cutting and overlay process, and (d) shows a support frame drawing process.
FIG. 5 is a cross-sectional view of a pavement showing the cutting overlay method of the present invention in time series, (e) shows a manhole frame setting process, and (f) shows a foundation concrete and finishing pavement filling process.
FIG. 6 is a cross-sectional view of a pavement showing the pavement method including the installation of a manhole frame according to the present invention in a time series, (a) shows a new installation or replacement pavement process, and (b) shows a support frame extraction process. .
FIG. 7 is a cross-sectional view of the pavement showing the pavement construction method including the installation of the manhole frame of the present invention in time series, (c) is the manhole frame setting process, (d) is the filling of the basic concrete and the finished pavement material A process is shown.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Manhole frame 2 Manhole cover 3 Peeling material 4 Pavement 5 repaired Overlay 6 Manhole base wall 7 Pavement part around manhole frame 9 Basic concrete 10 Pavement material 12 Lifter 13 Holding frame 14 Inner mold frame 20 Support frame 21 Support lid 22 Pavement material for temporary restoration 23 Cutting surface 24 Pavement around support frame 26 Pavement surface 27 Pavement for new installation or replacement

Claims (3)

A pavement overlay method including a manhole frame having the following steps (a) to (d).
(A) The manhole cover surface is covered with a release material and the overlay is applied to the pavement surface including the release material surface. (B) The manhole frame is forcibly pulled out with a lifter, the holding frame on the upper surface of the pavement is precut without being step being removed together with the manhole frame (c) manhole frame is fixed, the manhole frame so as to abut the tip portion of the holding frame to the overlay surface (D) A process in which the gap between the manhole frame and the manhole base wall is filled with the inner mold frame. (D) Among the hollow portions around the manhole frame, the manhole is inserted from the upper surface of the manhole base wall. After foundation concrete for solidification has been struck in the field at a level higher than the lower surface of the frame, -The process of placing pavement material up to the height of the Burleigh surface A pavement cutting overlay method including a manhole frame having the following steps (a) to (f).
(A) By forcibly pulling out the manhole frame with a lifter, the pavement around the manhole frame is removed together with the manhole frame without being cut in advance. (B) With a support frame on the manhole base wall (C) The pavement surface is cut including the surface of the pavement material on the manhole base wall, and the cutting surface is applied to the cutting surface. (D) The pavement on the support lid is removed from the overlay, the support lid is removed, and the support frame is forcibly pulled upward by a lifter, so that the pavement around the support frame is removed. pre-holding frame on the upper surface of the step (e) manhole frame is removed together with the support frame without being cut is fixed, O the tip portion of the holding frame -A process in which the manhole frame is set to float above the manhole base wall so as to be in contact with the surface of the lay, and the gap between the manhole frame and the manhole base wall is filled with the inner mold frame (f) In the cavity, after foundation concrete for solidification is cast in the area from the upper surface of the manhole base wall to the height of the lower surface of the manhole frame, the pavement material is struck from the foundation concrete to the height of the overlay surface. Process to be established A paving method including the installation of a manhole frame having the following steps (a) to (d).
(A) A process of temporarily placing a support lid with a support frame on the manhole base wall in the paved road surface and pavement including the surface of the support lid on the paved road surface. (B) Paving on the support lid. (C) Manhole A process of removing the support lid by removing the support frame and forcibly pulling the support frame upward with a lifter so that the pavement around the support frame is removed without being cut in advance. A holding frame is fixed to the upper surface of the frame, and the manhole frame is set so as to float above the manhole base wall so that the tip of the holding frame is in contact with the pavement surface, and between the manhole frame and the manhole base wall (D) Of the hollow portion around the manhole frame, the foundation core for rooting is formed in a portion of the cavity around the manhole frame that is higher than the lower surface of the manhole frame from the upper surface of the manhole base wall. After the concrete is hit on site, the pavement material is placed in the area from the foundation concrete to the height of the pavement surface.

Images