JP4877838B2 - Manhole frame installation method - Google Patents

Description

  The present invention relates to a manhole frame installation method.

Patent Document 1 discloses a pavement method that can perform pavement construction on a road without being obstructed by a manhole frame and can easily match the height of the upper surface of the manhole frame with the height of the road surface. In this pavement method, a support lid (temporary lid) is placed on the manhole base wall, and after pavement is performed on the surface, the pavement around the area where the manhole frame is to be installed is cut into a cylindrical shape. Then, the cut pavement plate and the support lid are removed, and a manhole frame is installed on the trace.
Japanese Patent No. 2623492

  However, in the paved road in which the pavement layer is formed on the crushed stone layer, the cylindrical cutting can be performed only on the pavement layer, and the crushed stone layer cannot be cut. For this reason, the above conventional pavement method of removing the pavement layer on the support lid as a lump cut pavement plate is not applicable, and it is necessary to crush the pavement layer using a concrete breaker etc. There is a problem that is difficult.

  Therefore, the present invention solves such problems, and in a paved road composed of a lower crushed stone layer and an upper pavement layer, quick and quiet pavement construction and an easy height between the manhole frame and the road surface. The purpose is to provide a manhole frame installation method that can be adjusted.

  In order to achieve the above object, according to the first aspect of the present invention, a temporary lid is formed so that the manhole base wall (1) constituting the peripheral wall of the manhole opening (O) is exposed and the manhole opening (O) is closed thereon. 3), a step of forming a lower crushed stone layer (41) and a pavement layer (42) thereabove on the temporary lid (3), and a pavement layer (42) ) Through the crushed stone layer (41) to the engagement hole (31) provided at the center of the temporary lid (3), and a region for installing the manhole frame (2) A step of cutting the pavement layer (42) in the predetermined region (E) including the cylindrical shape, and the engaging portion (53) provided on the pressing tool (5) through the work hole (43) and the temporary lid (3) A step of preventing the pressing tool (5) from moving away from the surface of the pavement layer (42) by engaging with the engaging hole (31) of the pressing tool, 5) the pressing portion (522) provided in the predetermined area (E) is advanced toward the surface of the pavement layer (42) to compress and crush the pavement layer (42), and the crushed pavement layer ( 42), the crushed stone layer (41) below it, and the temporary lid (3) are removed, and the manhole frame (2) is installed on the manhole base wall (1) at substantially the same height as the paved road surface. ing.

  In the first invention, a paved road composed of a lower crushed stone layer and an upper paved layer can be quickly formed on a temporary lid without a manhole frame. And, since the pavement layer of the predetermined area including the area where the manhole frame is installed is pressed and crushed by the cooperation of the temporary lid and the pressing tool, it is possible to perform a quiet construction and, together with the crushed stone layer below, The crushed stone layer can be quickly removed by digging, and then the manhole frame can be easily installed at substantially the same height as the road surface.

  In the second invention, the engagement hole (31) of the temporary lid (3) is formed with a screw portion (311) on the inner periphery, and the engagement portion of the pressing tool (5) is formed on the screw portion (311). The temporary lid (3) and the engaging portion (53) are engaged by screwing the screw portion (531) of (53). In the second invention, the temporary lid and the pressing tool can be integrated easily and firmly.

  In the third aspect of the invention, the upper surface of the temporary lid (3) is provided with a concentric pattern (32) centered on the engagement hole (31). Note that such a temporary lid is not limited to use in the installation method of the present invention. In the third aspect of the invention, the center position of the temporary lid can be quickly estimated by observing the bending direction and the degree of bending of the arc portion of the concentric pattern exposed in the work hole that was initially cut. , It is possible to minimize the reworking of the work hole.

  In addition, the code | symbol in the said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.

  As described above, according to the manhole frame installation method of the present invention, in the paved road composed of the lower crushed stone layer and the upper pavement layer, quick and quiet pavement construction, easy manhole frame and road surface Height adjustment is possible.

  This embodiment demonstrates the case where the installation method of the manhole frame of this invention is applied to the replacement process of a pavement. In this step, first, as shown in FIG. 1 (1), the existing manhole frame 2 installed on the cylindrical manhole base wall 1 includes an adjustment ring 11 below and a manhole covered therewith. It is removed together with the lid 21 by a known method, and the roadbed B of the existing paved road is excavated to the vicinity of the upper end of the outer periphery of the manhole base wall 1. At this time, the manhole opening O is covered and closed with a temporary lid 3 which will be described in detail later. Thereafter, pressure regulation / rolling of the roadbed B is performed (FIG. 1 (2)). Subsequently, the roadbed B and the temporary lid 3 are flush with the lower crushed stone layer 41 and the upper paved layer 42. A new paved road 4 is formed (FIG. 1 (3)). Thereafter, as shown in FIG. 2, a work hole 43 of about 100 mmφ passing through the pavement layer 42 and the crushed stone layer 41 of the new pavement 4 on the temporary lid 3 up and down to the upper surface of the central portion of the temporary lid 3. Is cut. In cutting the work hole 43, the pavement layer 42 is removed by cutting it into a cylindrical shape with a known core cutter, and the crushed stone layer 41 is removed by digging out crushed stone.

  Here, in FIG. 6, the top view of the said temporary cover 3 seen from upper direction is shown. The temporary lid 3 is a cast circular plate having a size sufficient to close the manhole opening O, and a circular engagement hole 31 is provided at the center thereof. A threaded portion 311 is formed in the engagement hole 31 as shown in FIG. In addition, a plurality of annular protrusions 32 are formed on the upper surface of the temporary lid 3 at equal intervals from the inner periphery to the outer periphery, concentrically with the engagement hole 31 as the center.

  By the way, when the work hole 43 is cut in the paved road 4, before forming the paved road 4, the distance from the mark around the road to the center of the temporary lid 3 is measured in advance with a tape measure or the like. In addition, according to this measurement data, the center position of the temporary lid 3 under the new paved road 4 is estimated and the work hole 43 is cut. However, according to this, the estimated center position often deviates from the actual position, and it becomes necessary to redo the work hole 43. Therefore, a method of specifying the outer shape of the temporary lid 3 under the paved road 4 using a metal detector and estimating the center position from the specified outer shape is often used as a method of accurately specifying the temporary lid center position. Yes. However, metal detectors cannot be used near concrete pavements or guardrails with reinforcing bars.

  Here, when the temporary lid 3 of the present embodiment is used, as shown by a chain line in FIG. 6, when the work hole 43 is cut at a position shifted from the temporary lid center position where the engagement hole 31 is provided. In other words, the center position of the temporary lid 3 can be quickly estimated by observing the bending direction and the degree of bending of the arc portion of the annular protrusion 32 exposed in the work hole 43. Thereby, the reworking of the work hole cutting can be minimized.

  Now, after cutting a work hole 43 reaching the upper surface of the central portion of the temporary lid 3 as shown in FIG. The pavement layer 42 in a predetermined region (substantially the diameter region of the temporary lid 3 in the present embodiment) including a region where the new manhole frame 2 is installed is cut into a cylindrical shape with a cutter (a cutting line is indicated by a symbol Lc). Thereafter, as shown in FIG. 3, the pressing tool 5 is positioned on the paved road 4 in the circular cutting area E. In the pressing tool 5, four places (only two places are shown in FIG. 3) at equal intervals in the circumferential direction on the lower surface of the main body 51 are supported by an extendable leg body 52 composed of a hydraulic jack 521. Each of the pressing pieces 522 as the pressing portions is in contact with the upper surface of the paved road 4. A screw rod 53 as an engaging portion is held at the center of the main body 51 of the pressing tool 5 so as to be movable in the vertical direction. The tip screw portion 531 of the screw rod 53 is connected to the engaging hole 31 at the center of the temporary lid 3. The ring-shaped base end 532 of the screw rod 53 is brought into contact with the top surface of the main body 51. Thereby, the pressing tool 5 main body is prevented from moving away from the surface of the paved road 4.

  In this state, when all the legs 52 constituted by the hydraulic jacks 521 are extended at the same time, a large pressing force is applied to the pavement layer 42 of the pavement 4 via the pressing piece 522 by the reaction force. The pavement layer 42 is pressed and crushed around the region F where the 522 abuts. FIG. 4 shows a plan view of the circular cutting area E. In this embodiment, the main crushing line Ld extends in the radial direction connecting each area F with which the pressing piece 522 of the leg 52 abuts and the work hole 43, and is circular. The cutting area E is roughly divided into four.

  After crushing the pavement layer 42 in this way, the leg body 52 is contracted and the screw rod 53 and the engagement hole 31 are unscrewed to remove the pressing tool 5 from the pavement 4. Thereafter, the crushed pavement layer 42 in the circular cutting region E and the crushed stone layer 41 therebelow are dug out, the temporary lid 3 is removed, and the upper end of the manhole base wall 1 is exposed as shown in FIG. In this state, as shown in FIG. 5 (2), the adjustment ring 11 is overlaid on the upper end of the cylindrical manhole base wall 1, and the manhole frame 2 is installed at a height almost equal to the road surface. A manhole cover 21 is covered with the opening. Then, the concrete 44 is poured into the space behind the adjustment ring 11 and the manhole frame 21 until it is flush with the road surface. In this way, the manhole frame 2 and the manhole cover 21 supported by the manhole frame 2 are installed on the new pavement 4.

  The manhole frame installation method of the present invention can be applied not only to a paved road replacement process but also to a process of cutting a part of the paved road. Moreover, it may replace with the cyclic | annular convex part 32 of the temporary cover 3, and it is good also as a cyclic | annular recessed part, and the concentric pattern should just be attached | subjected. In the above embodiment, the engagement with the engagement hole is performed by the screw portion, but the present invention is not limited to this.

It is sectional drawing which shows the example which applied the installation method of the manhole frame of this invention to the replacement | exchange process of a pavement. It is principal part sectional drawing explaining the installation construction method of the manhole frame of this invention. It is principal part sectional drawing explaining the installation construction method of the manhole frame of this invention. It is a principal part top view explaining the installation construction method of the manhole frame of this invention. It is sectional drawing which shows the example which applied the installation method of the manhole frame of this invention to the replacement | exchange process of a pavement. It is a top view of the temporary cover used for the installation method of the manhole frame of this invention. It is a principal part perspective view of the temporary cover used for the installation method of the manhole frame of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Manhole base wall, 3 ... Temporary lid, 31 ... Engagement hole, 311 ... Screw part, 32 ... Annular convex part (concentric pattern), 4 ... Paved road, 41 ... Crushed stone layer, 42 ... Paved layer, 43 ... Work Holes, 5 ... pressing tools, 53 ... screw rods (engaging portions), 531 ... screw portions, 522 ... pressing pieces (pressing portions), E ... (predetermined areas), O ... manhole openings.

Claims (3)

A step of installing a temporary lid so as to expose a manhole base wall constituting the peripheral wall of the manhole opening and closing the manhole opening thereon, and a lower crushed stone layer constituting a paved road on the temporary cover and above A step of forming a pavement layer, a step of forming a work hole extending from the pavement layer through the crushed stone layer to an engagement hole provided at the center of the temporary lid, and a region for installing a manhole frame The step of cutting the pavement layer in a predetermined region into a cylindrical shape, and the engagement portion provided on the pressing tool is engaged with the engagement hole of the temporary lid through the working hole, so that the paving of the pressing tool is performed. A step of preventing separation from the surface of the layer, a step of pressing the pressing portion provided in the pressing tool toward the surface of the pavement layer in the predetermined region, and crushing the pavement layer, and crushing The pavement layer, the crushed stone layer below it, and the temporary lid Removed by to installation method manhole frame and a step of installing the manhole frame on pavement surface substantially the same height on the manhole group wall. The engagement hole of the temporary lid is formed with a screw part on the inner periphery, and the screw part of the engagement part of the pressing tool is screwed to the screw part to engage the temporary cover and the engagement part. The manhole frame installation method according to claim 1 to be combined. The manhole frame installation method according to claim 1, wherein a concentric pattern with the engagement hole as a center is attached to an upper surface of the temporary lid.

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