JP2008150788A - Manhole frame periphery cutting method in cutting overlay construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manhole frame periphery cutting method for cutting the periphery of a manhole lid or a manhole frame twice not in the same section but in different sections in a cutting overlay construction method. <P>SOLUTION: The cutting overlay construction method comprises a first cutting and removing process, an overlay process, a second cutting and removing process, and a manhole mounting process. In this method, a radius L<SB>2</SB>of circular plane to be cut of a paved surface of an overlay 13 by a rotary cutter 15 in the second cutting and removing process is made larger than a radius L<SB>1</SB>of circular plane to be cut of a paved surface 1 by a rotary cutter 6 in the first cutting and removing process. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a manhole frame periphery cutting method that cuts a plane circle by a rotating cutter around the manhole frame twice in the cutting overlay method.

  In general, it is not possible to ignore the manhole cover installed on the road for road surface paving work.

  Therefore, three types of construction methods that take this manhole cover and cover frame into consideration are known.

  In other words, the paving method of paving the unpaved road surface with asphalt, the overlay method of paving the asphalt on the paved road surface, and removing the damaged road surface by cutting the paved surface, then asphalt A cutting overlay method in which a new paving process such as the above is applied is known.

  And in these construction methods, the manhole cover and manhole frame must be removed and the entire road surface must be paved, so the manhole cover and manhole frame are preliminarily placed around the road portion in the shape of a cylinder or arc. The process which cut | disconnects from a road surface using a rotary cutter and removes the peripheral part including a manhole frame is indispensable (refer patent document 1, patent document 2, patent document 3, patent document 4).

And especially in the cutting overlay method, the above-mentioned cutting removal process is performed twice before and after.
Japanese Patent No. 2623490 Japanese Patent No. 2623491 Japanese Patent No. 2623492 Japanese Patent No. 3644949

  In the cutting overlay method, the two steps before and after the same diameter have the advantage that, in theory, the same diameter can be repelled in the actual work site. There is no guarantee that it can be done in reverse, and the cut surface is often shifted and different, which causes a problem that the torque with respect to the rotary cutter fluctuates and gives the operator a sense of incongruity.

In particular, as shown in FIG. 7A, when the rotation centers C ₁ and C ₂ of the rotary cutter with the same radius r slightly deviate from each other, the two cutting lines t ₁ and t ₂ are often Crossing points X ₁ and X ₂ are generated, and when cut at the _first cutting line t ₁ and cut again at the second cutting line t ₂ as shown in FIG. Remains on the inner wall side, and there is also a disadvantage that a complete finish cannot be obtained.

In the present invention, the circumferential cut of the flat circular by rotary cutter in the first round of cutting removal process to radial length L ₁ from the center of the manhole frame at the outer periphery of the manhole frame, the second round of cutting removal process of the radius length L ₂ of the center of the manhole frame at different positions of the first round of the cutting portion and the second cut portion as large at the outer circumference of the flat circular circumference of the manhole frame by rotating cutters, An object of the present invention is to provide a manhole frame peripheral cutting method in a cutting overlay method characterized in that cutting lines do not intersect.

  This invention can solve the said subject by providing the following structures.

(1) a first cutting / removing step of cutting the pavement surface around the manhole frame into a plane circle using a rotary cutter that rotates about the central axis of the manhole frame, and removing the cut pavement plate and the manhole frame; After removal, a support lid is temporarily installed on the manhole foundation, and a pavement material is placed in the cavity around the support lid. The overlay process for constructing the material, and then the pavement surface around the manhole frame's planned installation area is cut into a planar circle using a rotary cutter that rotates around the central axis of the manhole frame from the overlay. The second cutting and removal process to remove the paving plate and the support frame, and the manhole frame installation foundation is constructed on the manhole foundation after the removal, and the manhole frame In the cutting overlay method, the paving material is placed in the cavity around the manhole frame up to the height of the overlay surface and the manhole cover is attached. manhole frame around, characterized in that than flat circular radius L ₁ of the cutting of the pavement surface by rotary cutter for processing the radius L ₂ of the plane circular pavement cleavage by rotary cutter of the second cutting removal step as large Cutting method.

  (2) In the cutting overlay method according to the above (1), the cutting with the rotary cutter in the first and second cutting and removing steps is a round shape with a circular plane and a side arc shape. Cutting method.

  (3) In the cutting overlay method according to the above (1), the cutting by the rotary cutter in the first and second cutting and removing steps is a cylindrical shape having a planar circular shape and a rectangular side surface. Construction method.

  (4) In the cutting overlay method according to the above (1), the upper part of the cut pavement in the first and second cutting and removing steps is provided at an outer peripheral position away from the center of the manhole cover and is inclined. A manhole frame peripheral cutting method characterized by being made up.

According to the present invention, in the cutting overlay method, the first manhole frame and the flat circular cutting and removing step by the surface untreated rotary cutter around the manhole frame, and the rotary cutter around the manhole frame after the second surface construction processing Since the lengths of the radial lengths L ₁ and L ₂ from the center of the manhole frame by the respective rotary cutters in the flat circular cutting and removing process by the above are different, the cutting portions are different from each other, and the torque during the conventional work is different. Smooth cutting with a rotating cutter can be performed without any change.

  In particular, even if there is a misalignment of the rotary cutter that requires centering, the cut end portion Y does not occur, so the finish is good and the work efficiency is not affected at all, so that the work efficiency can be improved.

  Further, since the manhole frame by the first cutting process and the surrounding land volume can be made smaller than the cutting processing volume by the cutting process not including the second manhole frame, the first time into the cavity by the first cutting process. The backfill material can be reduced in volume, and the removal volume and removal weight are small as a whole, and the work can be performed easily, so that the machine that operates the rotary cutter can also significantly improve the workability by using a small device.

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

  The cutting overlay method according to the present invention will be described in detail along with the drawings in the order of the construction process.

FIG. 1A shows a cutaway view of a road surface, that is, a pavement surface 1, a damaged pavement surface 1 before cutting, a manhole cover 2 that needs to be repaired disposed on the pavement surface 1, and a cover frame 3 thereof. The lid frame 3 is fixed on the manhole foundation 4 in the ground with the height adjustable via a mounting base 5 or the like. FIG. 2B shows a process of cutting the outer pavement surface 1 of the manhole cover frame 3 with a rotary cutter 6. The rotary cutter 6 has a curved surface with an arc-shaped cross section, and has a spherical surface with a radius L ₁ centering on the central axis C ₁ of the manhole cover 2. The rotary cutter 6 rotates and rotates with respect to the pavement surface 1. In this case, the cut surface 7 has a flat circular shape and has a circular arc shape in cross section, and has a bowl shape as a whole. The rotary cutter 6 is rotated below a necessary number of rotations by a rotation shaft (not shown), and after rotating 360 ° with respect to the pavement surface 1, the rotary cutter 6 is integrally fixed to the outer periphery of the manhole cover 2 and the frame 3. the donut-shaped cutting pavement (removal thereof) 8 are, to remove the pulling outside using the lower strap 9 hanging wires, such as the central axis C ₁ position of the manhole cover frame 3 (Fig. 1 (c), (d) reference). This process is the first cutting and removing process.

  In addition, when removing the cut pavement 8, it is possible to use a cutting tool S for peeling off the mounting base material 5 disposed on the manhole foundation 4 and for lifting.

  Next, after removal, a support lid (curing lid) 10 is temporarily shielded on the manhole foundation 4 and a pavement material 12 is placed in the cavity 11 around the support lid 10 (see FIG. 1 (d)). The surface of the material 12 is the same as the road pavement surface 1, and the surface of the pavement surface 1 of the road surface that is damaged and needs to be repaired, including the surface on which the pavement material 12 is placed, is cut d to obtain a uniform pavement surface 1a. To do. Then, an overlay 13 is applied to the pavement surface 1a from which the surface has been peeled using a new pavement material, and the overlay process is completed here (see FIGS. 2A, 2B, and 2C).

  Next, the second cutting and removing process starts.

Figure 3 pavement installation plan area around 14 manhole frame overlay 13 shown in (a), the overlay of the manhole frame from the top 13 central axis C ₁ upper position or axis C ₂ of the near point _(FIG. 5 ( The process of cutting using the rotary cutter 15 centering on the upper side is shown.

The rotary cutter 15 has a curved surface having an arc cross section like the rotary cutter 6, a spherical surface with a radius L ₂ centering on the central axis C ₁ or C ₂ position of the manhole frame, and paving the overlay 13. The cut surface 7a with respect to the pavement surface to be cut with respect to the surface has a flat circular shape and a circular arc shape in cross section, and has a bowl shape as a whole. The rotary cutter 15 performs the same rotational movement as the rotary cutter 6 and is rotated 360 ° with respect to the pavement surface.

By the way, the radius L ₂ of the rotary cutter 15 is larger than the radius L _{1 of} the first rotary cutter 6, so that the cut surface 7 a is formed outward from the cut surface 7.

Therefore, since the radius of curvature is different from that of the rotary cutters 6 and 15, the cutting process is not performed at the same place, and the center axes C ₁ and C ₂ of the rotary cutters 6 and 15, that is, the centering positions are slightly shifted. In addition, it is possible to obtain the cut surfaces 7 and 7a by performing a smooth cutting operation without causing a sense of incongruity when the cutting process is performed, and without generating a cut end portion.

  That is, as shown in FIGS. 5A and 5B, the cutting traces P and Q of both the first and second rotary cutters 6 and 15 are made to coincide with each other or be separated from each other. A new pavement can always be cut without matching.

  The paved portion thus cut can be lifted by pulling the support lid 10 by pulling the string 16 such as a wire and removed as a bowl-shaped body (removed object) 17. The second cutting and removing process can be completed. Note that the saddle-shaped body 17 of the cut pavement may be hung by using a hanging bolt by planting a hanging bolt.

  Next, a new manhole frame 3a is installed on the manhole base 4 in the removed cavity 18 (see FIG. 3C), and the height can be adjusted via the base material 5a. It is installed according to the height of the overlay surface, and a desired pavement material is placed in the space 19 around the manhole frame (see FIG. 4A) to the height of the overlay, and finally a new manhole cover 2a is installed. The manhole mounting process is completed by fitting the manhole frame 3a.

By the way, the rotary cutters 6 and 15 are, for example, radii from the central axes C ₁ and C ₂ of the manhole frame to the rotary cutter by using the road surface cutter shown in Japanese Patent No. 3371254 previously invented by the present inventor. Since the arm mechanism that can be changed in two ways, large and small, can be easily implemented.

  In the cutting and removing process by the first and second rotating cutters 6 or 15 described above, the lifting work is lifted up by using the hanging string 9 or 16 at the central portion of the manhole frame. However, by providing a lifting means at a preferred eccentric position on the outer periphery instead of the central location of the manhole frame, by lifting the saddle-shaped removal object 8 or 17 itself in a horizontal direction and lifting it up, If the pulling force is lighter than the conventional pulling force in the vertical direction, the uncut part of the central part is first moved laterally to peel off, and then pulled up in the vertical direction with the force of lifting only the weight, the whole is small. It is light and efficient with a lifting force and can be removed quickly.

Specifically, the configuration will be described with reference to FIGS. 6 (a) and 6 (b). In the second round of the second cutting removal process, and by aligning the locking hole in advance manhole base support lid 4 is disposed on (curing lid) 10 peripheral position Z apart from the center point C ₂ of If the lifting-off means, such as a wire, is pulled up to the outer peripheral position Z when lifting the saddle-shaped removal object 17 by the rotary cutter 15, the removal object 17 receives an eccentric force and is shifted laterally. Moreover, it is lifted while being inclined along the arcuate cut surface 7a. The pulling force acting at this time is much lighter than the conventional vertical pulling force. First, the uncut portion M in the center is moved laterally to separate it, and then the weight of the removed object 10 is removed. If the heel or other portion is separately provided with a lifting force and is lifted upward, the overall force can be reduced with a light force that cannot be predicted as a whole, and the working time can be shortened.

In more additional remark, the outer peripheral portions distant from the center axis C ₂ direction of the surface of the removed material 17, driving the fastener such as a bolt for locking, since the eccentric force is applied even by Yuzurihaue this stop The removal object 17 can be efficiently removed with the same light tensile force as described above.

  By the way, in actual execution construction, in the first cutting and removing step of the first time, it can be performed with a surface layer diameter of 900 mm, and in the second second cutting and removing step, the surface layer diameter of 950 mm. It can be cut by varying the size of 50 mm.

  Note that the arm mechanism for changing the radius of the rotary cutter in two different sizes is not limited to the invention disclosed in the above-mentioned patent, and can be implemented, for example, by the invention shown in JP-A-2004-324232. .

  The above is limited to a rotary cutter having a flat circular shape and a side surface having an arc shape that forms a part of a sphere. It can also be implemented by alternately using two types of rotary cutters having different radii.

  Furthermore, the detection means by the marker of the installation planned area such as a manhole frame or a manhole cover that is shielded by the overlay process can be performed in the same manner as the conventional method that is performed by drawing a mark at a non-paved portion such as a curb, The overlay process and the manhole mounting process are not limited to the above description of the embodiment and are not limited at all.

(A), (b), (c), (d) is a cross-sectional explanatory view of sequential work showing a first cutting and removing step showing an embodiment of the construction method according to the present invention. (A), (b), (c) is a cross-sectional explanatory diagram of sequential work showing the overlay process (A), (b), (c) is a cross-sectional explanatory diagram of sequential work showing the second cutting and removing step (A), (b), (c) is a cross-sectional explanatory diagram of sequential work showing the manhole mounting process (A) is an explanatory plan view when the cutting trace of the pavement surface by the two rotary cutters is formed on the same central axis, (b) is the misalignment of the cutting trace of the pavement surface by the two rotary cutters. Plane explanatory diagram when the center axis is lifted and formed (A), (b) shows the other example of the removal work of the removal thing in the 2nd cutting removal process which concerns on this invention, (a) is plane explanatory drawing, (b) is longitudinal description of (a). Figure (A) is a plan explanatory view showing a conventional process when a misalignment occurs and a road surface using a rotary cutter is cut twice with the same radius of rotation, and (b) is a longitudinal explanatory view of the above.

Explanation of symbols

1, 1a Pavement surface 2, 2a Manhole cover 3 Lid frame, Manhole cover frame 3a Manhole frame 4 Manhole foundation 5, 5a Installation base 6, 15 Rotating cutter 7, 7a Cut surface 8 Cut pavement (removal)
9 Suspension string 10 Support lid (curing lid)
DESCRIPTION OF SYMBOLS 11 Cavity part 12 Pavement material 13 Overlay 14 Around planned installation area 16 Wires, etc. String 17 Saddle-shaped body
18 Cavity 19 Cavity C ₁ , C ₂ Center axis d Cutting part L ₁ , L ₂ , r Rotational radius M of rotating cutter Uncut part S Cutting tool t ₁ , t ₂ Cutting line P, Q Cutting trace X ₁ , X ₂ places Y Cut edge places Z

Claims (4)

A first cutting and removing step of cutting the pavement surface around the manhole frame into a plane circle using a rotary cutter that rotates about the central axis of the manhole frame, and removing the cut pavement plate and the manhole frame; Temporarily install a support lid on the manhole foundation, place pavement material in the cavity around the support lid, cut the pavement surface including the surface of the pavement material on the manhole foundation, and construct a new pavement material on the cutting surface Cutting the paving surface around the planned installation area of the manhole frame into a circular plane using a rotating cutter that rotates about the central axis of the manhole frame from above the overlay, The second cutting and removal process to remove the support frame, and the manhole frame installation foundation is constructed on the manhole foundation after removal, and the manhole frame matches the height of the overlay surface. In the cutting overlay method, the paving material is placed in the cavity around the manhole frame up to the height of the overlay surface and the manhole cover is attached. manhole frame around the cutting, which comprises treating the planar circular radius L ₂ of the cleavage of the pavement by rotary cutter of the second cutting removal process than the radius L ₁ plane circular cutting of pavement by the cutter as a large Construction method.   2. The manhole frame peripheral cutting method according to claim 1, wherein the cutting by the rotary cutter in the first and second cutting and removing steps is formed into a bowl shape having a planar circular shape and a side arc shape.   2. The manhole frame peripheral cutting method according to claim 1, wherein the cutting by the rotary cutter in the first and second cutting and removing steps is a cylindrical shape having a flat circular shape and a side rectangular shape.   2. The cutting overlay method according to claim 1, wherein the upper part of the cut pavement in the first and second cutting and removing steps is provided at an eccentric outer peripheral position away from the center of the manhole cover, and is inclined and lifted. A manhole frame periphery cutting method characterized by comprising

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