JP6419738B2 - Manhole repair method and manhole repair structure - Google Patents

Description

  The present invention relates to a manhole repair method for restoring the function of an existing manhole that has deteriorated or deteriorated due to long-term use or the like, and a manhole repair structure constructed thereby.

  Various techniques have been proposed in the past for the repair method to restore the manhole function that has deteriorated due to long-term use after construction or deteriorated due to load or vibration received from passing vehicles, etc. As a thing relevant to this invention, there exists "a manhole repair construction method and a manhole repair structure" of patent document 1, for example.

  The “manhole renovation method and manhole renovation structure” described in Patent Document 1 is a resin manhole that has been previously processed according to the position and size of an existing pipe such as a sewage pipe while leaving the existing manhole housing. Is inserted into the existing manhole for renovation. The “manhole renovation method and manhole refurbishment structure” described in Patent Document 1 has advantages such as excellent workability and a short construction period because a light and high-strength resin manhole is inserted into an existing manhole for renovation. Yes.

JP 2012-154077 A

  As described above, the “manhole renovation method and manhole renovation structure” described in Patent Document 1 is renovated by inserting a lightweight, high-strength resin manhole into an existing manhole, so that it has excellent workability and a short construction period. Has advantages.

  However, in the “manhole renovation structure” constructed by the “manhole renovation method” described in Patent Document 1, the lower end of the straight wall of the resin manhole inserted into the existing manhole is the bottom of the existing manhole or the upper surface of the existing invert (For example, see FIG. 5 in Patent Document 1), the load or vibration generated by the vehicle passing through the upper surface of the manhole cover or cover frame after the repair or the road surface around it. Is transmitted to the degraded bottom of the existing manhole or the existing invert through the resin manhole straight wall.

  For this reason, there is a high possibility that a new crack will be generated or damaged at the bottom of the existing manhole or the existing invert, and it may not be possible to achieve functional recovery or improved durability of the existing manhole. In addition, since the bottom of the existing manhole and the existing invert are parts that are often deteriorated or damaged, when a load or vibration is transmitted to these parts through the straight wall of the resin manhole, The life of existing manholes may be lost in a short period of time.

  Furthermore, in the “manhole renovation method and manhole renovation structure” described in Patent Document 1, a resin manhole of a different material is inserted into an existing manhole made of reinforced concrete, so that the gap between the inner wall of the existing manhole and the outer wall of the resin manhole is inserted. Even if the filler is filled, it cannot be denied that the adhesiveness between the two may be hindered due to the difference in thermal expansion coefficient between the existing manhole and the resin manhole.

  Therefore, the problem to be solved by the present invention is to provide a manhole repair method and a manhole repair structure capable of reconstructing a manhole having good workability, a short construction period, and excellent durability.

The manhole repair method of the present invention is
Drilling around an existing manhole to expose the slant wall of the existing manhole;
Removing the portion of the existing manhole above the inclined wall;
Removing the invert inside the existing manhole;
Installing a disk-shaped new bottom plate having an outer diameter smaller than the inner diameter of the pipe mounting wall and the straight wall of the existing manhole on the upper surface of the existing bottom plate exposed by removing the invert;
A pipe mounting wall and a straight wall constituting a new manhole having an outer diameter smaller than an inner diameter of the straight wall of the existing manhole are inserted into the pipe mounting wall and the straight wall of the existing manhole, and the pipe mounting wall of the new manhole is Connecting the pipe mounting wall and the straight wall in an upright state in a state where the lower edge is in contact with the upper surface of the newly installed bottom plate,
Injecting a backfilling material into the gap between the pipe mounting wall and the straight wall inner peripheral surface of the existing manhole and the pipe mounting wall and the straight wall outer peripheral surface of the new manhole;
Installing an invert on the new bottom plate inside the new manhole;
Attaching a new inclined wall and adjustment ring to the upper edge of the straight wall of the new manhole;
Refilling the periphery of the inclined wall of the new manhole;
Attaching a receiving frame and an iron lid to the upper surface of the adjustment ring;
And a step of paving the periphery of the receiving frame.
Here, the existing manhole is not limited to an assembly manhole, but includes an on-site manhole.

A step of removing a portion of the existing manhole above the inclined wall;
A pipe mounting wall and a straight wall constituting a new manhole having an outer diameter smaller than an inner diameter of the straight wall of the existing manhole are inserted into the pipe mounting wall and the straight wall of the existing manhole, and the pipe mounting wall of the new manhole is Connecting the pipe mounting wall and the straight wall upright in a state where the lower edge is in contact with the upper surface of the newly installed bottom plate,
It is desirable to provide a step of cutting the inner peripheral surface of the straight wall of the existing manhole to a predetermined thickness.

Further, in Manhole repair method of the present invention, the new bottom plate is Ru disc shaped bottom plate der having a smaller outer diameter than the inner diameter of the existing settings manhole tube mounting wall and straight walls.

  Further, the straight wall of the new manhole can be formed by connecting a plurality of straight wall members in series.

On the other hand, the existing manhole is one of “n manholes: n = 1, 2, 3, 4, 5” defined in “Japan Sewer Association Standard: Manhole made of reinforced concrete for sewerage (JSWAS: A-11)”. Any one number "
The new manhole is preferably a “(n-1) manhole” defined in the “Japan Sewerage Association Standard”.

Specifically, if the existing manhole is “No. 1 manhole”, the new manhole is preferably “(1-1) manhole, ie,“ No. 0 manhole ”,
Similarly, if the existing manhole is “No. 2 manhole”, the newly established manhole is desirably “No. 1 manhole”, and if the existing manhole is “No. 5 manhole”, The new manhole is preferably "No. 4 manhole".

Next, the manhole repair structure of the present invention is:
The existing manhole that exists in the ground with the part over the inclined wall and the existing invert removed,
A disc-shaped newly installed bottom plate having an outer diameter smaller than the inner diameter of the pipe mounting wall and the straight wall of the existing manhole, installed on the upper surface of the existing bottom plate inside the existing manhole ;
A new manhole having an outer diameter smaller than the inner diameter of the straight wall of the existing manhole, which is erected on the new bottom plate inside the existing manhole;
A backfilling material filled in a gap between the inner peripheral surface of the existing manhole and the outer peripheral surface of the new manhole;
An invert installed on the new bottom plate inside the new manhole;
It is provided with.
Here, the existing manhole is not limited to an assembly manhole, and includes an on-site manhole.

On the other hand, the existing manhole is one of “n manholes: n = 1, 2, 3, 4, 5” defined in “Japan Sewer Association Standard: Manhole made of reinforced concrete for sewerage (JSWAS: A-11)”. Any one number "
The new manhole is preferably a “(n-1) manhole” defined in the “Japan Sewerage Association Standard”.

  According to the present invention, it is possible to provide a manhole repair method and a manhole repair structure capable of reconstructing a manhole having good workability, a short construction period, and excellent durability.

It is a vertical sectional view showing an existing manhole. It is a vertical sectional view which shows the state in the middle of implementing the manhole repair construction method which is embodiment of this invention with respect to the existing manhole. It is a vertical sectional view which shows the state in the middle of implementing the manhole repair construction method which is embodiment of this invention with respect to the existing manhole. It is a vertical sectional view which shows the state in the middle of implementing the manhole repair construction method which is embodiment of this invention with respect to the existing manhole. It is a vertical sectional view which shows the state in the middle of implementing the manhole repair construction method which is embodiment of this invention with respect to the existing manhole. It is a vertical sectional view which shows the state in the middle of implementing the manhole repair construction method which is embodiment of this invention with respect to the existing manhole. It is a vertical sectional view which shows the state in the middle of implementing the manhole repair construction method which is embodiment of this invention with respect to the existing manhole. It is a vertical sectional view which shows the state in the middle of implementing the manhole repair construction method which is embodiment of this invention with respect to the existing manhole. It is a vertical sectional view which shows the state in the middle of implementing the manhole repair construction method which is embodiment of this invention with respect to the existing manhole. It is a vertical sectional view which shows the state in the middle of implementing the manhole repair construction method which is embodiment of this invention with respect to the existing manhole. It is a vertical sectional view showing a manhole repair structure repaired by a manhole repair method according to an embodiment of the present invention.

  Hereinafter, based on FIGS. 1-11, the manhole repair construction method and repair structure which are embodiment of this invention are demonstrated.

  FIG. 1 is a vertical cross-sectional view showing an existing manhole 100 which is a target for carrying out (constructing) a manhole repair method according to an embodiment of the present invention. The existing manhole 100 is “No. 1 manhole” defined in “Japan Sewer Association Standard: Assembly Manhole Made of Reinforced Concrete for Sewerage (JSWAS: A-11)”.

  As shown in FIG. 1, the existing manhole 100 includes an existing bottom plate 101 disposed on the crushed stone / crushed stone foundation SB formed in the ground G, a pipe mounting wall 102 disposed on the existing bottom plate 101, and a pipe mounting A straight wall 105 formed by sequentially connecting a plurality of straight wall members 103 and 104 in series on the wall 102, a slant wall 106 connected on the straight wall member 104, and a slant wall 106. Adjustment ring 107, receiving frame 109 installed on adjustment ring 107 via adjustment mortar 108, and iron lid 110 fitted into receiving frame 109.

  An invert 111 having a flow path 111a having a U-shaped vertical cross section is disposed on the existing bottom plate 101 in the tube mounting wall 102. The existing pipe P is connected to the hole-drilling part 112 established in the wall part 102a of the pipe mounting wall 102. The opening of the existing pipe P communicates with the flow path 111a of the invert 111.

  Here, based on FIGS. 2-10, the process of implementing (constructing) the manhole repair method which is embodiment of this invention with respect to the existing manhole 100 shown in FIG. 1 is demonstrated. In addition, FIGS. 2-10 is located in a line along the construction procedure of the manhole repair method of this embodiment.

  As shown in FIG. 2, from the ground surface (paved surface) GS at a predetermined distance (for example, about 40 cm to 100 cm) from the peripheral edge of the receiving frame 109 of the iron lid 110 of the existing manhole 100 toward the ground G. The steel sheet pile SP for retaining the earth is press-fitted, and the periphery of the receiving frame 109 is surrounded by a plurality of steel sheet piles SP. Thereafter, the pavement layer and earth and sand around the receiving frame 109 surrounded by the steel sheet pile SP are excavated, and portions of the existing manhole 100 over the inclined wall 106 (the inclined wall 106, the adjusting ring 107, the adjusting mortar 108, and the receiving frame 109). ) Is exposed.

  Next, as shown in FIG. 3, the portions of the existing manhole 100 that are higher than the inclined wall 106 (the inclined wall 106, the adjusting ring 107, the adjusting mortar 108, and the receiving frame 109) are removed. As a result, the upper edge portion 104a of the straight wall member 104 located at the top of the straight wall 105 is exposed.

  Next, as shown in FIG. 4, the inner peripheral surfaces 104f and 103f of the straight wall members 104 and 103 forming the straight wall 105 of the existing manhole 100 and the inner peripheral surface 102f (see FIG. 3) of the pipe mounting wall 102 are predetermined. Cut only the thickness. In this case, since the thickness to cut is not limited, it can be determined according to the situation at the construction site, but is preferably about 5 mm to 10 mm, for example. Accordingly, as shown in FIG. 4, the inner peripheral surfaces 104g, 103g having a rougher surface roughness than the original inner peripheral surfaces 104f, 103f, 102f are formed inside the straight wall members 103, 104 and the inner side of the pipe mounting wall 102, respectively. , 102g are formed.

  Next, as shown in FIG. 5, the invert 111 (see FIG. 4) disposed on the existing bottom plate 101 inside the existing manhole 100 is removed, and the upper surface 101 a of the existing bottom plate 101 is exposed.

  Next, as shown in FIG. 6, a new bottom plate 201 is installed on the upper surface 101a of the existing bottom plate 101 exposed by removing the invert 111 (see FIG. 4). The new bottom plate 201 is a disk-shaped bottom plate having an outer diameter smaller than the inner diameter of the straight wall 105 (and the pipe mounting wall 102) of the existing manhole 100, and is a member made of reinforced concrete.

  After the new bottom plate 201 is installed on the upper surface 101a of the existing bottom plate 101, the components of the new manhole 200 (see FIG. 10) having an outer diameter smaller than the inner diameter of the straight wall 105 (and the pipe mounting wall 102) of the existing manhole 100 are used. A certain pipe mounting wall 202 and straight wall members 203 and 204 (see FIG. 7) are inserted in this order into the pipe mounting wall 102 and the straight wall 105 of the existing manhole 100 and connected so as not to move. In this case, the pipe mounting wall 202 is positioned so that the existing pipe P fits inside the inverted U-shaped drilling hole 212 formed in the wall body 202a of the pipe mounting wall 202, and the pipe mounting wall 202 is fitted to the newly installed bottom plate 201. Place on top.

  Thus, the pipe mounting wall 202 and the straight wall members 203 and 204 are erected in an upright state with the lower edge portion 202b of the pipe mounting wall 202 of the new manhole 200 being in contact with the upper surface 201a of the new bottom plate 201. It becomes. Here, the vertical size and number of the straight wall members 203 and 204 are set in accordance with the height of the straight wall 105 of the existing manhole 100. It is desirable to set the upper edge portion 204a of the straight wall 205 of the newly installed manhole 200 to be equal to or greater than the upper edge portion 104a of the straight wall 105 of the existing manhole 100. The new manhole 200 shown in FIG. 8 is a “No. 0 manhole” defined in “Japan Sewer Association Standard: Manhole Made of Reinforced Concrete for Sewerage (JSWAS: A-11)”.

  Next, as shown in FIG. 7, the inner peripheral surface 102 g of the pipe mounting wall 102 of the existing manhole 100 and the inner peripheral surfaces 103 g and 104 g of the straight wall 105, and the outer peripheral surface 202 c of the pipe mounting wall 202 of the new manhole 200 The backfill material R is injected into the gap between the outer peripheral surfaces 203c and 204c of the wall 205. The backfill material R is preferably cement-based mortar or resin-based mortar, but is not limited thereto.

  When the inside of the gap is filled with the backfilling material R without a gap, as shown in FIG. 7, a new invert 211 is installed on the upper surface 201a of the wall new bottom plate 201 in the tube mounting wall 202 constituting the new manhole 200. . On the upper surface of the invert 211, a flow path 211a having a U-shaped vertical cross section is formed in communication with the existing pipe P.

  Next, as shown in FIG. 8, a new inclined wall 206 and an adjustment ring 207 are sequentially attached to the upper edge portion 204a of the straight wall member 204 constituting the straight wall 205 of the new manhole 200, and are connected so as not to move with each other. To do.

  Next, as shown in FIG. 9, the plurality of steel sheet piles SP (see FIG. 8) that have been press-fitted into the ground are removed, and the recesses around the inclined wall 206 of the new manhole 200 are restored to the original state with earth and sand. Backfill. In this case, backfilling is performed to a depth near the boundary between the newly installed slant wall 206 and the adjustment ring 207.

  Next, as shown in FIG. 10, the receiving frame 209 is attached to the upper surface 207 a of the adjusting ring 207 via the adjustment mortar 208, and the iron lid 210 is attached to the receiving frame 209.

  Next, as shown in FIG. 11, when the recess around the adjustment ring 207 is backfilled with earth and sand, and the periphery of the receiving frame 209 is paved so as to be flush with the ground surface (paved surface) GS, the manhole repair structure 300 is completed.

  As shown in FIG. 1 to FIG. 11, in the manhole renovation method of this embodiment, the portion below the straight wall 105 of the existing manhole 100 that is “No. 1 manhole” defined in the “Japan Sewerage Association Standard” described above is used. The manhole renovation structure 300 is constructed by reusing the new manhole 200, which is the “No. 0 manhole” defined in the above-mentioned standard, so that the workability is good and the construction period is relatively short. Thus, the function of the existing manhole 100 can be recovered.

  In addition, as shown in FIG. 11, in the manhole renovation structure 300, the lower edge portion 202 b of the pipe mounting wall 202 that constitutes the new manhole 200 is the upper surface of the new bottom plate 201 that is arranged by removing the invert 111 of the existing manhole 100. It is in contact with 201a. Therefore, the load and vibration generated by the vehicle passing on the iron lid 210, the receiving frame 209, and the surrounding ground surface (paved surface) GS, etc., are newly installed through the straight wall 205 and the pipe mounting wall 202. 201. Thereby, since the load added to the structural member of the existing manhole 100 can be minimized, the manhole excellent in durability can be reconstructed.

  In the manhole repair structure 300, the pipe mounting wall 102 and the straight wall 105 (straight wall members 103 and 104) of the existing manhole 100, and the pipe mounting wall 202 and the straight wall 205 (straight wall members 203 and 204) of the new manhole 100 are provided. Are both made of the same material reinforced concrete. Therefore, the inner peripheral surface 102g of the pipe mounting wall 102 of the existing manhole 100 and the inner peripheral surfaces 103g, 104g of the straight wall 105, the outer peripheral surface 202c of the pipe mounting wall 202 of the new manhole 100, and the outer peripheral surfaces 203c, 204c of the straight wall 205. By injecting the backfill material R into the gap, these members are integrally fixed to each other, and the manhole repair structure 300 excellent in strength and durability can be obtained.

  In the manhole renovation method and manhole renovation structure 300 described with reference to FIGS. 1 to 11, the existing manhole 100 is defined in “Japan Sewer Association Standard: Reinforced Concrete Manhole for Sewerage (JSWAS: A-11)”. “No. 1 manhole”, and the newly established manhole 200 is “No. 0 manhole” defined in the above-mentioned standards, but is not limited thereto.

  That is, when the existing manhole 100 is an “n-th manhole (n = 1, 2, 3, 4, 5)” defined in the standard, the new manhole 200 is “(n− If “1) Manhole”, the manhole repair method and the manhole repair structure according to the present invention can be suitably implemented (constructed).

  Further, the manhole repair method and the manhole repair structure 300 described with reference to FIGS. 1 to 11 show an example of the present invention, and the manhole repair method and the manhole repair structure according to the present invention are the manhole repair method and the manhole described above. It is not limited to the repair structure 300.

  The manhole repair method and the manhole repair structure according to the present invention can be widely used in industrial fields such as the civil engineering construction industry as a means to restore the function of existing manholes that have been aged or deteriorated due to long-term use, etc. .

DESCRIPTION OF SYMBOLS 100 Existing manhole 101 Existing bottom plate 101a, 201a, 207a Upper surface 102,202 Pipe attachment wall 102a, 202a Wall part 102f, 102g, 103f, 103g, 104f, 104g Inner peripheral surface 103,104,203,204 Straight wall member 104a, 204a Upper edge portion 105,205 Straight wall 106,206 Slope wall 107,207 Adjusting ring 108,208 Adjusting mortar 109,209 Receiving frame 110,210 Iron cover 111,211 Invert 111a, 211a Channel 112,212 Drilling portion 200 Newly installed Manhole 201 Newly installed bottom plate 202b Lower edge 202c, 203c, 204c Outer periphery 300 Manhole repair structure G Ground GS Ground surface (paved surface)
P Existing pipe R Backfill material SB Kuriishi, crushed stone foundation SP Steel sheet pile

Claims (6)

Drilling around an existing manhole to expose the slant wall of the existing manhole;
Removing the portion of the existing manhole above the inclined wall;
Removing the invert inside the existing manhole;
Installing a disk-shaped new bottom plate having an outer diameter smaller than the inner diameter of the pipe mounting wall and the straight wall of the existing manhole on the upper surface of the existing bottom plate exposed by removing the invert;
A pipe mounting wall and a straight wall constituting a new manhole having an outer diameter smaller than an inner diameter of the straight wall of the existing manhole are inserted into the pipe mounting wall and the straight wall of the existing manhole, and the pipe mounting wall of the new manhole is Connecting the pipe mounting wall and the straight wall in an upright state in a state where the lower edge is in contact with the upper surface of the newly installed bottom plate,
Injecting a backfilling material into the gap between the pipe mounting wall and the straight wall inner peripheral surface of the existing manhole and the pipe mounting wall and the straight wall outer peripheral surface of the new manhole;
Installing an invert on the new bottom plate inside the new manhole;
Attaching a new inclined wall and adjustment ring to the upper edge of the straight wall of the new manhole;
Refilling the periphery of the inclined wall of the new manhole;
Attaching a receiving frame and an iron lid to the upper surface of the adjustment ring;
Paving around the receiving frame;
Manhole renovation method with Removing the portion of the existing manhole above the inclined wall;
A pipe mounting wall and a straight wall constituting a new manhole having an outer diameter smaller than an inner diameter of the straight wall of the existing manhole are inserted into the pipe mounting wall and the straight wall of the existing manhole, and the pipe mounting wall of the new manhole is Connecting the pipe mounting wall and the straight wall upright in a state where the lower edge is in contact with the upper surface of the newly installed bottom plate,
The manhole renovation method according to claim 1, further comprising a step of cutting the inner peripheral surface of the straight wall of the existing manhole to a predetermined thickness. The manhole renovation method according to claim 1 or 2, wherein the straight wall of the new manhole is formed by connecting a plurality of straight wall members in series. The existing manhole is one of “n No. manhole: n = 1, 2, 3, 4, 5” defined in “Japan Sewer Association Standard: Manhole made of reinforced concrete for sewer (JSWAS: A-11)”. One number "
The manhole renovation method according to any one of claims 1 to 3 , wherein the newly established manhole is a "(n-1) manhole" defined in the "Japan Sewerage Association Standard". The existing manhole that exists in the ground with the part over the inclined wall and the existing invert removed,
A disc-shaped newly installed bottom plate having an outer diameter smaller than the inner diameter of the pipe mounting wall and the straight wall of the existing manhole, installed on the upper surface of the existing bottom plate inside the existing manhole ;
A new manhole having an outer diameter smaller than the inner diameter of the straight wall of the existing manhole, which is erected on the new bottom plate inside the existing manhole;
A backfilling material filled in a gap between the inner peripheral surface of the existing manhole and the outer peripheral surface of the new manhole;
An invert installed on the new bottom plate inside the new manhole;
Manhole renovation structure with The existing manhole is one of “n No. manhole: n = 1, 2, 3, 4, 5” defined in “Japan Sewer Association Standard: Manhole made of reinforced concrete for sewer (JSWAS: A-11)”. One number "
The manhole renovation structure according to claim 5 , wherein the newly established manhole is a "(n-1) manhole" defined in the "Japan Sewerage Association Standard".

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