JP5605916B2 - Replacement method for lids for underground structures - Google Patents

Description

  The present invention removes the existing underground structure lid installed on the opening of the lower base for the underground structure, and removes the underground structure lid to install a new underground structure lid. It relates to the replacement method.

  As used herein, the term “underdrain” refers to manholes in sewers, sewage tanks, waterworks and gas underground valve chambers, which are constructed in the shape of pits with their openings facing the ground surface, in the shape of horizontal holes in the ground. It is a generic term for extended culverts, joint grooves, caves, box-shaped waterworks and gas valve pits installed in the ground, block manholes for telecommunications, and the like.

  In addition, the term “underground structure lid” as used herein refers to a receiving frame that is disposed on the opening of each lower arm and communicates with the interior of the lower arm and the ground, and is supported by the receiving frame. Manhole cover with lid body that can be opened and closed, large iron cover, sewage sash cover, iron cover for joint groove, iron cover for power transmission, iron cover for power distribution, fire hydrant cover, water control valve cover, gate valve cover, Air valve lid, gas pipe lid, water meter lid, etc. are generic names.

  In recent years, when installing the lid for the underground structure on the opening of the lower arm, the anchor is driven into the upper surface of the lower arm, or using a lower arm with an insert nut in advance, the bolt is erected, It has been practiced to take a safety measure to tightly fix the receiving frame and the lower collar together with the bolt (for example, Patent Document 1).

  For example, if the underground structure is a sewerage pipeline facility, the combined sewerage system that excludes sewage and rainwater using the same pipeline, and the diversion system that excludes sewage and rainwater using separate pipelines. In the case of the former combined sewage system, a large amount of rainwater flows into the sewer line at a stroke in the event of a heavy rain. For this reason, the air pressure in the pipe line rises locally or suddenly, or the rainwater itself is fixed by tightening and fixing the underground structure (lower arm) and the cover for the underground structure (receiving frame) together with bolts. As the air pressure rises rapidly, the underground structure lid (receiving frame) installed at the upper end of the underground structure (lower roof) is prevented from coming off and scattering.

  In addition, even for underground structures other than sewerage pipe facilities, the pavement surface around the lid for underground structures is subsurface due to subsidence or damage due to vibration or aging degradation caused by running of large vehicles. ) And the underground structure lid may come off with the receiving frame and scatter, and the underground structure lid (receiving frame) and the underground structure (lower arm) are now tightly fixed together with bolts. It is coming.

  Such bolting and fixing of the receiving frame and the lower arm are performed not only when newly installing a cover for an underground structure, but also when replacing a cover for an aged or damaged underground structure. Various construction methods have been studied (for example, Patent Document 2 and Patent Document 3).

Japanese Patent Laid-Open No. 2005-009265 JP 2006-233754 A JP 2005-220733 A

  As described in Patent Documents 1 to 3 above, if the bolt for tightly fixing the receiving frame and the lower collar can be erected from the upper surface of the lower collar, the bolt is securely fixed without any problem. It is possible, but there is no strength when there is no insert nut for standing bolts on the upper surface of the existing lower armor, the width of the upper surface of the lower armor is narrow, or the upper surface of the lower armature is deteriorated As a result, when the anchor nut formed with the female thread cannot be driven into the upper surface of the lower collar, it is necessary to replace the entire lower collar, and there is a problem that a great deal of cost and labor are required.

  The present invention has been made in view of the above-described problems, and even if it is difficult to erect a bolt on the upper surface of the lower iron, the receiving frame and the lower iron are utilized using the existing lower iron. It is an object of the present invention to provide a method for replacing a lid for an underground structure that can be fastened with bolts.

  The method of replacing the underground structure lid according to the present invention includes a step of removing the pavement around the receiving frame of the existing underground structure lid and the receiving frame of the existing underground structure lid, and an existing underground structure lid. A step of drilling a mounting hole in the side wall of the lower arm, and one end of which can be inserted into the mounting hole, and the other end is located above the upper surface of the lower arm of the existing underground structure Fixing a bending bolt, which has been bent in advance so as to stand in the vertical direction of the underlay for the underground structure of the existing underground structure, and a receiving frame for the newly installed cover for the underground structure Are installed in accordance with the height of the surrounding pavement, and are fastened and fixed to the bending bolt, a lower surface of the receiving frame of the newly installed underground structure lid, and a lower arm of the existing underground structure. An installation foundation is built in the space between the upper surface of the floor and the circumference of the receiving frame for the newly installed underground structure lid A step of pouring the paving material into the cavity of, is characterized in that it has a.

  As described above, it is difficult to erect a bolt on the upper surface of the lower arm by fixing the bending bolt to the lower arm using the mounting hole provided on the side wall of the lower arm of the existing underground structure. Even in such a case, it is possible to fasten and fix the receiving frame and the lower arm using the existing lower arm.

  The replacement method of the present invention includes a step of removing a pavement around a receiving frame of the existing underground structure lid and a receiving frame of the existing underground structure lid, and a side wall of a lower arm for the existing underground structure And the step of cutting the mounting hole in the peripheral direction, the step of cutting the underlay for the existing underground structure in the circumferential direction. By this, even when the height of the existing receiving frame is low and the receiving frame to be newly installed is high, by cutting the underlay for the existing underground structure in the circumferential direction and reducing the height of the existing underlay It is possible to replace the cover for the underground structure and fix the bolts without replacing the existing underarm.

  In the replacement method of the present invention, it is preferable to use, as a bending bolt, a bending bolt having a side wall-corresponding portion bent into a shape along the side wall surface of the lower arm for the existing underground structure. Thus, by using a bending bolt having a side wall corresponding part, the bending bolt can be firmly fixed to the lower arm.

  According to the underground structure lid replacement method of the present invention, even if it is difficult to erect bolts on the upper surface of the lower arm, using the existing armpit, the receiving frame and the lower arm The bolt can be tightly fixed.

In the replacement method (Embodiment 1) of this invention, it is sectional drawing which shows the state cut into the pavement around the receiving frame of the lid | cover for an existing underground structure as a first process. In the replacement method of the present invention (Embodiment 1), after removing the existing underground structure lid (receiving frame), shows a state in which the newly installed underground structure lid receiving frame is installed, (a) is a plan view, (B) is AA 'sectional drawing of (a). In the replacement method of the present invention (Embodiment 1), after installing the receiving frame to be newly installed, an installation foundation is constructed in the space between the lower surface of the receiving frame and the upper surface of the lower arm, and in the cavity around the newly installed receiving frame. It is sectional drawing which shows the state which laid the pavement material. In the replacement method (Embodiment 1) of this invention, it is a perspective view which shows the use condition of the drilling apparatus used in order to drill a mounting hole in the side wall of a lower arm. In the replacement method of this invention, it is sectional drawing which shows other embodiment (Embodiment 2) which constructs | assembles an installation foundation in the space between the lower surface of the receiving frame newly installed, and the upper surface of a lower collar. In the replacement method of this invention, it is sectional drawing which shows other embodiment (Embodiment 3) which constructs | assembles an installation foundation in the space between the lower surface of the receiving frame newly installed, and the upper surface of a lower arm. In Embodiment 3 of this invention shown in FIG. 6, it is sectional drawing which shows the state which laid the pavement material in the cavity around the installation foundation and the receiving frame to be newly installed. In the replacement method of this invention, it is sectional drawing which shows other embodiment (Embodiment 4) which constructs | assembles an installation foundation in the space between the lower surface of the receiving frame newly installed, and the upper surface of a lower arm. In the replacement method (Embodiment 5) of this invention, it is sectional drawing which shows the state which cut | disconnected the upper part of the lower collar in the circumferential direction, after removing the existing receiving frame. In the replacement method of the present invention (Embodiment 5), a state in which the diameter adjusting ring 110 is installed on a lower punch whose upper portion is cut in the circumferential direction is shown, (a) is a plan view, and (b) is A in (a). It is -A 'sectional drawing. In the replacement method (Embodiment 5) of this invention, it is sectional drawing which shows the state which installed the receiving frame newly installed.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a sectional view showing a state in which a pavement around a receiving frame of an existing underground structure lid is cut as a first step in the replacement method of the present invention.

  The existing underground structure lid 10 includes a receiving frame 11 and a lid main body 12 supported by the receiving frame 11 so as to be openable and closable, and an opening portion of an undercarriage 20 for an existing underground structure embedded in the ground. It is installed on the top.

  When replacing the existing underground structure lid 10, first, a cut 31 is made in the pavement 30 around the receiving frame 11 of the existing underground structure lid 10. In the present embodiment, the cut 31 is spherical. Such a spherical cut 31 can be formed by using a road surface cutter device having a known spherical blade according to Japanese Patent No. 4030915. When the cut 31 is made in the pavement 30, the pavement 30 inside the cut 31 (paving around the receiving frame of the existing underground structure lid) and the existing underground structure lid 10 (receiving frame 11) are removed.

  FIG. 2 shows a state in which a receiving frame 41 for a newly installed underground structure lid is installed after removing the existing underground structure lid 10 (receiving frame 11) in the replacement method of the present invention, and FIG. FIG. 4B is a cross-sectional view taken along the line AA ′ in FIG.

  After removing the existing underground structure lid 10 (the receiving frame 11), in order to install the newly installed underground structure lid receiving frame 41, first, the mounting holes 21 are provided in the side walls of the existing undercarriage 20 for the underground structure. Drill holes. Next, one end of the bending bolts 50 and 51 is inserted into the mounting hole 21 and fixed to the lower collar 20.

  The bending bolt 50 is fixed to the straight wall portion of the lower rod 20, and the bending bolt 51 is fixed to the inclined wall portion of the lower rod 20. Specifically, the bending bolt 51 is fixed to the center of the inclined wall portion 20a of the lower collar 20 (on the line A ′ in the plan view of FIG. 2A. The same applies hereinafter), and the bending bolt 50 is a bending bolt. It is fixed to a straight wall portion at a position of 120 ° in the circumferential direction with reference to 51. The bending bolts 50 and 51 are bent in advance so that one end can be inserted into the mounting hole 21 and the other end is positioned above the upper surface of the lower rod 20 and is erected in the vertical direction of the lower rod 20. Has been. Further, the bending bolt 50 has a side wall corresponding part 50a bent into a shape along the straight wall surface of the lower rod 20, and the bending bolt 51 corresponds to a side wall bent into a shape along the oblique wall surface of the lower rod 20. Part 51a.

  One end of the bending bolt 50 passes through the mounting hole 21 and is fixed to the lower collar 20 by screwing the nut 50b. The bending bolt 51 is also fixed to the lower collar 20 by passing one end of the bending bolt 51 through the mounting hole 21 and screwing the nut 51b. However, in fixing the bending bolt 51, a taper plate 51 c is interposed between the nut 51 b and the inclined wall surface of the lower rod 20 in order to correspond to the inclined wall surface of the lower rod 20. In a state where the bending bolts 50 and 51 are fixed to the lower rod 20, the respective side wall corresponding portions 50a and 51a are located along the side wall surface of the lower rod 20 as shown in FIG. 50a and 51a can be firmly and stably fixed to the lower eyelid 20.

  After the bending bolts 50 and 51 are fixed to the lower rod 20, the bulk adjuster 60 is screwed into the bending bolts 50 and 51, respectively. In the bulk adjuster 60, a nut is insert-molded in the central bolt insertion hole, and the screwing position between the bending bolts 50 and 51 can be adjusted. Next, the other ends of the bending bolts 50 and 51 are inserted into the anchor holes provided in the flange of the receiving frame 41 to be newly installed, the receiving frame 41 is placed on the bulk adjuster 60, and the bulk of the receiving frame 41 is adjusted by adjusting the bulk. The height of the upper surface is adjusted to the height of the surrounding pavement 30. Subsequently, the receiving block 41 and the bending bolts 50 and 51 are tightly fixed by attaching and fixing the fixing block 61 to the bending bolts 50 and 51.

  FIG. 3 is a perspective view of the replacement method of the present invention, in which after installing the receiving frame 41 to be newly installed, an installation foundation is constructed in the space between the lower surface of the receiving frame 41 and the upper surface of the lower rod 20, and It is sectional drawing which shows the state which laid the pavement material in the cavity part.

  In order to construct an installation foundation in the space between the lower surface of the receiving frame 41 to be newly installed and the upper surface of the lower rod 20, in this embodiment, along the inner periphery of the receiving frame 41, the inner peripheral surface of the receiving frame 41 and the lower part below it. The inner frame 70 is arranged so as to straddle the inner peripheral surface of the flange 20. The inner frame 70 has a flexibility that can be deformed into a cylindrical shape at the time of use, and in this embodiment, a foamed polystyrene band material is used.

  Next, the non-shrink mortar M is filled so as to reach the space between the lower surface of the receiving frame 41 and the upper surface of the lower collar 20 and the cavity around the receiving frame 41. As a result, the installation foundation 80 is constructed in the space between the lower surface of the receiving frame 41 to be newly installed and the upper surface of the lower collar 20, and the lower pavement 32 is constructed in the lower layer portion of the cavity around the receiving frame 41 to be newly installed. . Thereafter, a surface layer mortar or a heated composite material is placed on the lower layer pavement 32 so as to have the same height as the surrounding pavement 30 to construct the surface layer pavement 33. Thereafter, the inner frame 70 is removed.

  Here, in the present embodiment, an example of a drilling device used for drilling the mounting hole 21 in the side wall of the lower rod 20 will be described. FIG. 4 is a perspective view showing a use state of the drilling device.

  A drilling device 200 shown in FIG. 4 includes a rack 202 spanned in the diameter direction of the opening portion of the lower rod 20 via a fixture 201, and a longitudinal direction (diameter of the opening portion of the lower rod 20). Drilling drill 203 slidably mounted along the direction).

  In the present embodiment, as shown in FIG. 2, the mounting hole 21 has one place in the center of the inclined wall portion 20 a of the lower collar 20 and two places in the straight wall portion 20 b at a position of 120 ° in the circumferential direction with reference to this. A total of three holes are drilled.

  FIG. 4 shows a state where the mounting hole is provided at the center of the inclined wall portion of the lower collar 20. Since the center of the inclined wall portion of the lower heel 20 is a position facing the step 300 provided in the center of the straight wall portion of the lower heel 20, it is between the center of the inclined wall portion and the center of the straight wall portion. As shown in FIG. 4, the hole drilling device 200 is mounted on the lower punch 20. In this state, the mounting hole is drilled in the center of the inclined wall portion of the lower rod 20 by advancing the drilling drill 203.

  On the other hand, the mounting hole drilled in the straight wall portion is drilled at a position of 120 ° in the circumferential direction with respect to the mounting hole in the center of the inclined wall portion. In the example, a marking jig 204 is used. The marking jig 204 can be mounted on the rack 202 at the center in the longitudinal direction. When the marking jig 204 is mounted on the rack 202, the length is set so that both ends thereof are positioned at 120 ° in the circumferential direction with reference to the mounting hole at the center of the inclined wall portion. Therefore, if marking is performed at a position where both ends of the marking jig 204 are located in the state of FIG. 4, the position of the mounting hole to be drilled in the straight wall portion can be easily grasped. Then, using the marking as a mark, the drilling device 200 is mounted again so as to match the position of the mounting hole drilled in the straight wall portion, and the mounting hole is drilled.

  The mounting hole can be drilled by using, for example, a commercially available drill for drilling without using the above-described drilling device 200.

  Further, without using the above-described drilling device 200 or the marking jig 204, a laying iron plate or a ring-shaped jig in which a bolt insertion hole is drilled at every 120 ° position in accordance with an anchor hole provided in a flange of a new receiving frame. Tools can also be used. Thereby, the drilling position of the mounting hole can be easily determined, and the bending bolts 50 and 51 can be erected vertically in accordance with the diameter of the anchor hole provided in the flange of the receiving frame to be newly installed. .

(Embodiment 2)
FIG. 5 is a cross-sectional view showing another embodiment in which an installation foundation is constructed in a space between the lower surface of the receiving frame 41 to be newly installed and the upper surface of the lower rod 20 in the replacement method of the present invention.

  In the present embodiment, an outer frame 90 is used in addition to the inner frame 70. The outer frame 90 is disposed along the outer periphery of the flange of the receiving frame 41 to be newly provided. Similar to the inner frame 70, the outer frame 90 has a flexible shape that is normally band-shaped and can be deformed into a cylindrical shape during use. In this embodiment, a band-shaped material of expanded polystyrene is used.

  In the present embodiment, the installation base 80 is constructed in the space between the lower surface of the receiving frame 41 and the upper surface of the lower rod 20 by filling the space between the inner frame 70 and the outer frame 90 with the non-shrink mortar M. . Thereafter, the inner frame 70 and the outer frame 90 are removed, and a pavement material is placed in the cavity around the receiving frame 41. The kind of pavement material is not particularly limited. For example, a roadbed material can be placed as a lower layer pavement material, and a surface mortar or a heating compound can be placed as a surface layer pavement material.

(Embodiment 3)
FIG. 6 is a cross-sectional view showing still another embodiment in which an installation foundation is constructed in a space between the lower surface of the receiving frame 41 to be newly installed and the upper surface of the lower rod 20 in the replacement method of the present invention.

  In the present embodiment, the height adjustment ring 100 is installed as a part of the installation foundation in the space between the lower surface of the receiving frame 41 and the upper surface of the lower collar 20.

  That is, in the present embodiment, after the bending bolts 50 and 51 are fixed to the lower rod 20 in the same manner as in the first embodiment, the other ends of the bending bolts 50 and 51 are inserted into the through holes provided in the height adjustment ring 100. And the height adjustment ring 100 is installed on the lower eyelid 20.

  Next, in the same manner as in the first embodiment, the height of the upper surface of the receiving frame 41 is adjusted to the height of the surrounding pavement 30 using the bulk adjuster 60, and then the fixing block 61 is bent to the bending bolt 50, By attaching and fixing to 51, the receiving frame 41 and the bending bolts 50 and 51 are tightly fixed.

  Thereafter, as shown in FIG. 7, the inner frame 70 is arranged along the inner periphery of the receiving frame 41 in the same manner as in the first embodiment, and between the lower surface of the receiving frame 41 and the upper surface of the height adjustment ring 100. The non-shrink mortar M is filled so as to reach the space and the cavity around the receiving frame 41. As a result, an installation foundation 80 composed of the height adjustment ring 100 and the non-shrink mortar M is constructed in the space between the lower surface of the newly-received receiving frame 41 and the upper surface of the lower collar 20, and the surroundings of the newly-received receiving frame 41 are A lower pavement 32 is constructed in the lower layer of the cavity. Thereafter, a surface layer mortar or a heated composite material is placed on the lower layer pavement 32 so as to have the same height as the surrounding pavement 30 to construct the surface layer pavement 33. Thereafter, the inner frame 70 is removed.

  In the embodiment in which the height adjustment ring 100 is used as in this embodiment, the height of the upper surface of the receiving frame 41 is set to the height of the surrounding pavement 30 only by placing the receiving frame 41 on the height adjusting ring 100. When it agrees with this, the use of the bulk adjuster 60 can be omitted.

(Embodiment 4)
FIG. 8 is a cross-sectional view showing still another embodiment in which an installation foundation is constructed in a space between the lower surface of the receiving frame 41 to be newly installed and the upper surface of the lower rod 20 in the replacement method of the present invention.

  The present embodiment is a modification of the third embodiment, and uses an outer frame 90 in addition to the inner frame 70. The outer frame 90 is disposed so as to straddle the outer peripheral surface of the flange of the receiving frame 41 and the outer peripheral surface of the height adjustment ring 100 below the outer peripheral surface of the flange of the receiving frame 41 along the outer periphery of the flange of the receiving frame 41 to be newly provided. Then, by filling the space between the inner frame 70 and the outer frame 90 with the non-shrink mortar M, the height adjustment ring 100 and the non-shrink mortar are formed in the space between the lower surface of the receiving frame 41 and the upper surface of the lower collar 20. An installation base 80 composed of M is constructed. Thereafter, the inner frame 70 and the outer frame 90 are removed, and a pavement material is placed in the cavity around the receiving frame 41.

(Embodiment 5)
The present embodiment includes a step of cutting an undercarriage for an existing underground structure in the circumferential direction after removing a receiving frame of the existing underground structure lid.

  If the height of the existing receiving frame is low and the new receiving frame is high, the new receiving frame may not be installed on the existing lower arm as it is. Therefore, in the present embodiment, as shown in FIG. 9, after the existing receiving frame is removed, the upper portion of the lower collar 20 is cut in the circumferential direction so as to secure a height space for installing the new receiving frame.

  However, as shown in FIG. 9, when the lower rod 20 has the inclined wall portion 20a, if the upper portion of the lower rod 20 is cut in the circumferential direction, the diameter of the upper portion of the lower rod 20 increases, It may become impossible to install a new receiving frame. As a countermeasure, in the present embodiment, a diameter adjusting ring 110 is used as shown in FIG.

  In other words, in this embodiment, after the bending bolts 52 and 53 are fixed to the mounting holes drilled in the side wall of the lower rod 20, the other ends of the bending bolts 52 and 53 are inserted into the through holes provided in the diameter adjustment ring 110. The diameter adjustment ring 110 is installed on the lower eyelid 20. In the first embodiment, the bending bolts 50 and 51 are raised along the outer side wall surface of the lower eyelid 20, but in this embodiment, it corresponds to the enlargement of the opening by cutting the upper portion of the lower eyelid 20. The bending bolts 52 and 53 are raised along the inner side wall surface of the lower collar 20. The length of the lower bolt 20 in the radial direction of the bending bolts 52 and 53 is set according to the anchor hole provided in the flange of the newly installed receiving frame, but the bending bolt 52 to the mounting hole provided in the lower hook 20 By changing the insertion length of 53, the length in the radial direction of the lower eyelid 20 can also be adjusted.

  Next, as shown in FIG. 11, the height of the upper surface of the receiving frame 41 is adjusted to the height of the surrounding pavement 30 using the bulk adjuster 60 in the same manner as in the first embodiment, and then fixed. By mounting and fixing the block 61 to the bending bolts 50 and 51, the receiving frame 41 and the bending bolts 50 and 51 are tightly fixed. Thereafter, the inner frame 70 is disposed along the inner periphery of the receiving frame 41, and the non-shrink mortar M is disposed so as to reach the space between the lower surface of the receiving frame 41 and the upper surface of the diameter adjusting ring 110 and the cavity around the receiving frame 41. Fill. As a result, the installation base 80 composed of the diameter adjusting ring 110 and the non-shrink mortar M is constructed in the space between the lower surface of the newly-received receiving frame 41 and the upper surface of the lower collar 20, and the cavity around the newly-received receiving frame 41 A lower pavement 32 is constructed in the lower layer of the part. Thereafter, a surface layer mortar or a heated composite material is placed on the lower layer pavement 32 so as to have the same height as the surrounding pavement 30 to construct the surface layer pavement 33. Thereafter, the inner frame 70 is removed.

  In the embodiment using the diameter adjusting ring 110 as in the present embodiment, the height of the upper surface of the receiving frame 41 is set to the height of the surrounding pavement 30 only by placing the receiving frame 41 on the diameter adjusting ring 110. If they match, the use of the bulk adjuster 60 can be omitted.

  In the above embodiment, the mounting hole drilled in the side wall of the lower collar is a through hole. However, the mounting hole may be a bottomed hole instead of the through hole. When the mounting hole is a bottomed hole, one end of the bending bolt may be fixed to the mounting hole using an adhesive or the like.

  Further, in the above embodiment, the road surface cutter device having a spherical blade is used to make a cut into a spherical shape, but the shape of the cut is not limited to this, and for example, a cylindrical shape or a rectangular tubular shape may be used. Good.

  Moreover, the pavement around the receiving frame of the existing underground structure lid may be crushed by a hand tool without using the road surface cutter device, and the receiving frame of the pavement and the underground structure lid may be removed.

DESCRIPTION OF SYMBOLS 10 Existing lid for underground structure 11 Existing receiving frame 12 Lid main body 20 Lower gutter 20a Slanted wall portion 20b Straight wall portion 21 Mounting hole 30 Pavement 31 Notch 32 Lower layer pavement 33 Surface pavement 41 New receiving frame 50, 51 Bending bolt 50a, 51a Side wall corresponding part 50b, 51b Nut 51c Taper plate 52, 53 Bending bolt 60 Bulk adjusting tool 61 Fixed block 70 Inner frame 80 Installation foundation 90 Outer frame 100 Height adjusting ring 110 Diameter adjusting ring 200 Drilling device 201 Fixing tool 202 Rack 203 Drilling drill 204 Marking jig M Non-shrink mortar

Claims (3)

Removing the pavement around the receiving frame of the existing underground structure lid and the receiving frame of the existing underground structure lid;
Drilling a mounting hole in the side wall of an underlay for an existing underground structure;
One end can be inserted into the mounting hole, and the other end is positioned above the upper surface of the existing undercarriage for the undercarriage and stands in the vertical direction of the existing undercarriage for the undercarriage A step of fixing a bending bolt that has been bent in advance to the underlay for the existing underground structure;
A step of installing the receiving frame of the lid for the underground structure to be newly installed according to the height of the surrounding pavement and tightly fixing the bending bolt;
An installation foundation is constructed in a space between the lower surface of the receiving frame of the newly installed underground structure lid and the upper surface of the lower base of the existing underground structure, and around the receiving frame of the newly installed underground structure lid. Placing a pavement material in the cavity,
A method for replacing a lid for an underground structure, characterized by comprising: Removing the pavement around the receiving frame of the existing underground structure lid and removing the receiving frame of the existing underground structure lid, and drilling a mounting hole in the side wall of the underlay for the existing underground structure lid Between
The method for replacing a lid for an underground structure according to claim 1, further comprising a step of cutting the underlay for the existing underground structure in a circumferential direction.   The lid for an underground structure according to claim 1 or 2, wherein a bending bolt having a side wall corresponding portion bent into a shape along a side wall surface of a lower arm of the existing underground structure is used as the bending bolt. Replacement method.

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