JP2005030008A - Reconstruction method for manhole and in-cutter device for reconstructing manhole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely improve durability after reconstruction. <P>SOLUTION: A concrete structure C is cut from the inner peripheral side by rotating a cutter 102c of an in-cutter device 100, and after dividing the structure into upper concrete structures Cad, Cru and Crl and lower concrete structures Crl, Csl and Cst, a pavement part R is cut from the surface side by rotating a cutter part 202C of an out-cutter device 200, and is divided into an inner peripheral side pavement structure Ri and an outer peripheral side pavement structure Ro. The upper concrete structures Cad, Cru and Crl are removed by being still integrally suspended with the inner peripheral side pavement structure Ri and a manhole frame 2, and corresponding new concrete structures CadN, CruN and CrlN are arranged on the remaining concrete structures Crl, Csl and Cst, and a new manhole frame 2N is arranged, and a filler is filled between the frame and the remaining outer peripheral side pavement structure Ro. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manhole remodeling method for repairing an aged manhole, and a manhole remodeling incutter device used therefor.
[0002]
[Prior art]
When a manhole cover installed on a paved road surface and a manhole frame that supports the manhole cover are used for many years, for example, the vehicle is distorted, deformed, damaged, and the like, and the material strength is deteriorated. The aging manhole cover and manhole frame are replaced and repaired.
[0003]
As such a manhole repair and maintenance method, conventionally, the pavement part (roadbed) around the manhole cover is cut into a circle using a road cutter, etc., while the concrete structure under the manhole frame is manually operated from the inner periphery side. Break with a breaker, etc., and if there are anchor bolts, cut with a glider etc., remove them to the ground side, then replace the removed manhole frame and the concrete structure below it Is installed, and the manhole frame is filled with non-shrink mortar and the like, and finally paved for reconstruction (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP 2001-226996 A (paragraph numbers 0002-0009)
[0005]
[Problems to be solved by the invention]
However, the following problems exist in the above-described conventional technology.
[0006]
That is, when the concrete structure is destroyed with a manually operated breaker as described above, the concrete structure is sequentially destroyed while the operator roughly moves the breaker manually with large vibrations. Therefore, in reality, it is difficult to properly define and destroy only the area to be removed, and the area that is not originally removed (the part that remains as a structure after repair) will be distorted or damaged by the breaker. May give. In such a case, even if the manhole cover, the manhole frame, and the concrete structure under the manhole are renewed due to aging, the durability as a manhole may be lowered as long as the damaged part remains. .
[0007]
An object of the present invention is to provide a manhole remodeling method and a manhole remodeling incutter device used for the manhole, which can reliably improve durability after the remodeling.
[0008]
[Means for Solving the Problems]
(1) In order to achieve the above object, the manhole remodeling construction method of the present invention includes a substantially disc-shaped cutter of an incutter device on the inner peripheral side of a substantially annular concrete structure located below a substantially circular manhole frame. And rotating the substantially disc-shaped cutter to cut the concrete structure over the entire circumference from the inner peripheral side, dividing the upper concrete structure and the lower concrete structure from the cutting position, A substantially cylindrical cutter of an out-cutter device is arranged on the pavement portion on the outer peripheral side of the manhole frame, and the substantially cylindrical cutter is rotated to cut the pavement portion from the surface side to the full depth, and a cutting position. The upper concrete structure divided by the substantially disc-shaped cutter of the in-cutter device is divided into a pavement structure on the inner circumference side and a pavement structure on the outer circumference side, and the outer concrete structure is separated from the pavement structure on the outer circumference side. The upper concrete structure is lifted as it is integrated with the pavement structure on the inner peripheral side divided by the substantially cylindrical cutter of the cutter device and the manhole frame fixed to the inner peripheral side, removed to the ground side, and removed. A new concrete structure corresponding to the object is installed on the remaining concrete structure, and a new manhole frame is installed on the upper part of the new concrete structure. A predetermined filler is filled between the outer side pavement structure.
[0009]
In the present invention, the substantially disc-shaped cutter of the incutter device is disposed on the inner peripheral side of the concrete structure, rotated and cut over the entire circumference, and the concrete structure above this is cut into the substantially cylindrical shape of the outcutter device. It is lifted and removed with the inner pavement structure cut with the cutter. Then, a new concrete structure, a manhole frame, and a predetermined filler are sequentially installed in the removed portion and finished. With this method, it is possible to clearly separate and remove only the portion of the concrete structure that should be removed, which may cause distortion or damage to the remaining portion as in the case of using a conventional breaker. As a result, the durability after the reconstruction can be surely improved.
[0010]
(2) In the above (1), preferably, in the cutting of the in-cutter device, pre-cutting is performed over the entire circumference in a state where the substantially disc-shaped cutter is first bite into the inner peripheral surface of the concrete structure. To form a groove on the entire circumference of the inner peripheral surface, and then, in the incutter device, a plurality of rollers arranged in substantially the same horizontal plane as the substantially disc-shaped cutter are inserted into the groove formed on the entire circumference. Then, using this as a guide, the substantially disc-shaped cutter is further deeply cut, and the concrete structure is fully cut from the inner peripheral side over the entire periphery to perform the division.
[0011]
As a result, the trajectory of the substantially disc-shaped cutter can be stabilized, and the substantially disc-shaped cutter can be cut more efficiently and smoothly around the entire circumference in a substantially horizontal plane, and inadvertent damage due to misalignment during cutting, etc. Since it can be surely prevented, the durability can be improved more reliably.
[0012]
(3) In the above (1) or (2), preferably, the thickness of the upper concrete structure for removing the cutting position by the substantially disc-shaped cutter of the incutter device to the ground side is ready-made. The thickness of the concrete ring member is set to be substantially the same, and the concrete ring member is installed on the remaining concrete structure as the new concrete structure.
[0013]
If the thickness of the upper concrete structure to be removed is almost the same as that of a ready-made concrete ring member (so-called adjustment ring), the above-mentioned ring member, which is a ready-made product, is simply installed in the empty space after removal. All that is required is to eliminate the need for placing concrete that is usually done in the field to fill the extra space. Thereby, shortening of a construction period and cost reduction can be aimed at.
[0014]
(4) In order to achieve the above object, a manhole reconstructing incutter device according to the present invention is a base disposed substantially horizontally on the inner peripheral side of a substantially annular concrete structure located below a substantially circular manhole frame. And a motor that generates a rotational driving force and a substantially disk-shaped cutter that rotates by the rotational driving force of the motor and cuts the inner peripheral side of the concrete structure, and advances and retreats from the base portion to the concrete structure. A drive unit provided on the inner peripheral side of the body so as to be able to be viewed and connected, and a lower end side connected to the base unit, and an upper end side is arranged so as to appear on the ground side outside the manhole, and swivel that can be gripped and rotated by human power The swivel hand includes a handle portion and a plurality of rollers that rotate in a substantially horizontal plane and abut against the inner peripheral side of the concrete structure, and are connected to the base portion. And a guide roller unit by the operation of the parts for guiding the rotation of the base portion.
[0015]
(5) In the above (4), preferably, each of the rollers of the guide roller portion is disposed in substantially the same horizontal plane as the cutter, and has a thickness substantially equal to or less than the thickness of the cutter. It has a collar part protruding so as to be able to penetrate into the cutting groove cut by the cutter of the driving part.
[0016]
(6) In the above (4) or (5), preferably, the plurality of rollers of the guide roller portion are connected to the base portion via a spring, and the inner peripheral side of the concrete structure is connected to the base portion. It includes a pressing roller that presses with the biasing force of the spring.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0018]
The present invention relates to replacement / repair work of an aging manhole cover and manhole frame. Hereinafter, the work process and the apparatus configuration used therefor will be described in order.
[0019]
(0) Manhole superstructure
FIG. 1 is a side sectional view showing an upper structure of a manhole M to which the renovation construction method according to this embodiment is applied. In FIG. 1, a manhole M has a substantially circular manhole cover 1 disposed so that the upper surface thereof is substantially flush with the road surface (paving portion) D, and a substantially circular (annular) manhole that supports the manhole cover 1. It has a frame 2, a concrete structure (manhole housing) C provided under the manhole frame 2, and anchor bolts 3 for fixing the manhole frame 2 to the concrete structure C.
[0020]
The concrete structure C is a large-diameter straight wall Cst and an inclined wall that is fixed to the upper portion of the straight wall Cst and contracts upward from the large diameter of the straight wall Cst to correspond to the small diameter of the manhole cover 1. Csl, first-stage adjustment ring Crl fixed to the upper part of the slant wall Csl, second-stage adjustment ring Cru fixed to the upper part of the first-stage adjustment ring Crl, as described above In order to adjust the manhole frame 2 and the manhole cover 1 in accordance with the height of the road surface R, it is provided with adjustment concrete Cad placed in an actual construction site, and is substantially annular as a whole. . The straight wall Cst, the inclined wall Csl, the adjustment ring Crl, and the adjustment ring Cru are secondary concrete products, and are commercially available according to predetermined predetermined standards.
[0021]
The anchor bolt 3 penetrates the manhole frame 2, the adjustment concrete Cad, the adjustment ring Cru, and the adjustment ring Crl from the upper part of the manhole frame 2 provided on the upper side of the adjustment concrete Cad, and the tip part thereof is the upper end part of the inclined wall Csl. It is concluded to reach.
[0022]
(1) Installation of incutter device
When repairing the upper structure including the replacement of the manhole cover 1 with respect to the manhole M having the above structure, first, as shown in FIG. A protective lid 4 is installed to protect In this example, a protective lid 4 is provided near the upper end of the inclined wall Csl. Thereafter, the incutter device 100 for cutting the concrete structure C is suspended in the manhole M, and the substantially disc-shaped cutter (described later) is disposed on the inner peripheral side of the concrete structure C (see FIG. 2 described later). .
[0023]
The detailed structure of the incutter device 100 will be described below.
[0024]
FIG. 2 is a side sectional view showing the entire structure of the incutter device 100 together with the arrangement state in the concrete structure C, and FIG. 3 is a top view seen from the direction III in FIG.
[0025]
2 and 3, the incutter device 100 includes a base portion 101 disposed substantially horizontally on the inner peripheral side of a substantially annular concrete structure C positioned below the substantially circular manhole frame 2, and a base portion 101. The drive unit 102 is provided so as to be able to move forward and backward to the inner peripheral side of the concrete structure C, and the lower end side is connected to the base unit 101 and the upper end side is arranged to appear on the ground side outside the manhole M. And a guide roller portion 104 that is connected to the base portion 101 and guides the rotation of the base portion 101 due to the operation of the turning handle portion 103.
[0026]
4 is an enlarged top view showing the detailed structure of the base portion 101, the drive portion 102, and the guide roller portion 104. FIG. 5 is a side view as seen from the direction V in FIG. The lock pin is not shown).
[0027]
The base portion 101 is erected on the base portion main body 101a and a central portion in the width direction (vertical direction in FIG. 4) of the base portion main body 101a, and is provided with an internal screw for inserting and screwing the ball screw 105a of the feed jack 105. And a bracket 101b.
[0028]
The drive unit 102 includes a main frame portion 102aA located in the center in the width direction (vertical direction in FIG. 4), a frame 102a composed of side frame portions 102aB and 102aC located on both sides thereof, and a rear side of the main frame portion 102aA (see FIG. 4 (right side in FIG. 4) and a motor (for example, a hydraulic motor) 102b that generates a rotational driving force, and is rotatably supported at a lower portion of the left end of the main frame portion 102aA in FIG. 4 by the rotational driving force of the motor 102b. A substantially disc-shaped cutter 102c that rotates to cut the inner peripheral side of the concrete structure C is provided.
[0029]
A pulley 102e is arranged on the rotating shaft 102d of the cutter 102c that is rotatably supported by the bearing 102dA so as to be between the tip of the main frame portion 102aA and the cutter 102c, and an output shaft (not shown) of the motor 102b. When the motor 102 rotates, the cutter 102c is rotated via the pulley 102f, the belt 102g, and the pulley 102e.
[0030]
The drive unit 102 also supports a jack support bracket (not shown) connected to the ball screw 105a so as to rotatably support the ball screw 105a of the feed jack 105 and restrain the axial movement of the main frame unit 102aA. Provided at the bottom. With such a structure, by rotating the handle portion 105 b of the feed jack 105, the drive portion 102 moves forward and backward with respect to the base portion 101. A hydraulic cylinder may be used instead of such a manual feed jack.
[0031]
The guide roller unit 104 includes roller assemblies 104L and 104R having the same structure on both the left and right sides in the width direction (vertical direction in FIG. 4).
[0032]
The roller assemblies 104L and 104R are located on the rear side (right side in FIG. 4) and are fixed to the end portion in the width direction of the base portion main body 101a of the base portion 101, and the rear roller bracket 104a. And a rear roller (fixed roller) 104b that contacts the inner peripheral side of the concrete structure C (described later) and forward from the rear roller bracket 104a. A substantially cylindrical (cylinder) -shaped guide arm that is attached so as to extend toward the side and is inserted in a through hole (not shown) provided in the aforementioned side frame portion 102aB or 102aC of the drive portion 102 so as to be axially movable. 104c and a front roller bracket 104d that is movably disposed on the front side (left side in FIG. 4) of the guide arm 104c (details will be described later) The front is rotatably supported by the roller bracket 104d, and a front roller (elastic roller) 104e which rotates in a substantially horizontal plane (Figure 4 paper plane).
[0033]
The rear rollers 104b and 104b and the front rollers 104e and 104e are disposed in substantially the same horizontal plane as the cutter 102c as shown in FIG. Each roller 104b or 104e has a flange portion 104bA or 104eA that has a thickness substantially equal to or less than the thickness of the cutter 102c and protrudes so as to be able to penetrate into a cutting groove T (see FIG. 2) cut by the cutter 102c. Have.
[0034]
The front roller bracket 104d is slidably disposed in the front support bracket 104h in the front-rear direction (left-right direction in FIG. 4), and on the rear side (right side in FIG. 4) is a shaft having a smaller diameter than the guide arm 104c. 104f is fixed. The rear side of the shaft 104f is inserted into the guide arm 104c so as to be slidable in the axial direction. A spring 104g is wound around the outer periphery of the shaft 104f. The front end portion of the spring 104g is in contact with the rear end portion of the front roller bracket 104d (see FIG. 5). The rear side of the spring 104g is inserted into the guide arm 104c, and the rear end portion is inside the guide arm 104c. It is fixed at the rear side (for example, inside the flange portion 104cA). With such a structure, the front roller bracket 104d and the front roller 104e can move back and forth with respect to the guide arm 104c, in other words, the distance from the rear roller 104b can be expanded and contracted. Then, it is connected to the guide arm 104c and the rear roller bracket 104a (in other words, to the base portion 101) via the spring 104g, and functions as a pressing roller that presses the inner peripheral side of the concrete structure C with the urging force of the spring 104g ( Details will be described later).
[0035]
At this time, the lock pin 104i is inserted into a through hole (not shown) formed in the pin attachment portion 104dA provided so as to protrude to the outer peripheral side of the front roller bracket 104d, and the front end portion of the lock pin 104i is the pin attachment portion. It is fixed to the portion 104dA. On the other hand, the other end side of the lock pin 104i is inserted into a through hole (not shown) of a lock pin insertion bracket 102aD or 102aE projecting further outward in the width direction of the side frame portion 102aB or 102aC, and a nut is inserted into the tip screw portion. 104j is screwed. Thereby, as will be described later, when the drive unit 102 is brought close to the base unit 101 by the operation of the feed jack 105, the lock pin insertion bracket 102aD or 102aE moves rearward and comes into contact with the nut 104j. The front roller 104e and the front roller bracket 104d also approach the guide arm 104 side while contracting the spring 104g in accordance with the retraction of the drive unit 102.
[0036]
As will be described later, the front support bracket 104h is fixed to the lower end portion of the turning handle portion 103, and regardless of whether the drive portion 102 advances or retreats with respect to the base portion 101 and the front roller 104e and the front roller bracket 104d extend and contract. The relative position with respect to the base part 101 is fixed.
[0037]
The swivel handle 103 includes a handle main body 103a that can be gripped and rotated by human power, a locking tool 103b for locking a suspension provided at the upper portion of the handle main body 103a in the radial direction, a handle main body 103a, and a guide roller unit. 104, and a handling arm 103c that supports the weight of the entire incutter device 100.
[0038]
The handling arm 103c descends downward while extending in a radial direction radially from the lower end of the suspension arm 103cA, and one suspension arm 103cA that extends vertically downward from the lower part of the handle body 103a in the radial direction. A total of four branch arm portions 103cB that are extended and arranged in this manner. Of the four branch arm portions 103cB, the two lower ends on the front side are fixed to the front support bracket 104h of the guide roller portion 104, and the two lower ends on the rear side are on the rear end portion of the guide arm 104c. The provided rear support bracket 104cB is fixed.
[0039]
(2) Cutting with incutter
The incutter device 100 having the above structure is suspended in the manhole M, and the concrete structure C is cut by the following procedure. 6-9 is explanatory drawing seen from the upper surface side showing the cutting | disconnection procedure.
[0040]
FIG. 6 is a diagram illustrating a state in which the incutter device 100 is suspended in the manhole M. When suspending, the handle portion 105b of the feed jack 105 is operated in advance to sufficiently retract the drive portion 102 toward the base portion 101, and both the front rollers 104e and 104e and the rear rollers 104b and 104b are concrete structures. After the state of not interfering with the inner peripheral surface of C, for example, the locking tool 103b of the turning handle portion 103 is slowly suspended in the manhole M while being suspended by the lever block of the work vehicle.
[0041]
When the cutter 102c is disposed at a predetermined height position on the inner periphery side of the concrete structure C (in this example, in detail, near the lower end of the first-stage adjustment ring Crl), from the ground side outside the manhole M, The handle portion 105b of the feed jack 105 is rotated via a predetermined tool (for example, a ratchet handle) to rotate the ball screw 105a, and the drive portion 102 is advanced from the base portion 101. First, the front rollers 104e and 104e are in contact with the inner peripheral surface of the concrete structure C. When the ball screw 105a is further rotated in the same direction, the end surface (rear surface) of the lock pin insertion bracket 102aD or 102aE is separated from the nut 104j, and the drive unit 102 is further advanced, and the cutter 102c is moved to the concrete structure C (specifically, the adjustment ring). Crl). FIG. 7 is a view showing a state in which the cutter 102c of the incutter apparatus 100 is in contact with the inner peripheral surface of the concrete structure C. FIG.
[0042]
When this contact state is reached, the motor 102b is activated to rotate the cutter 102c, and the ball screw 105a is further rotated in the same direction so that the inner surface of the concrete structure C is shallowly (for example, about 10 mm) and cut. In this state, the turning handle portion 103a is gripped on the ground side and slowly rotated (360 °), whereby a cutting groove T is formed on the inner peripheral surface over the entire circumference of the concrete structure C (see FIG. 2 and FIG. 9 described later). (Pre-cutting). FIG. 8 is a diagram illustrating a state immediately after the pre-cutting by the cutter 102c of the in-cutter device 100 is started. Here, when it is rotated 360 ° as shown by the white arrow in FIG. 8, the cutting groove T already formed by the cutter 102c preceding the rotation direction side is present in the following plane that is substantially in the same plane as the cutter 102. The front roller collar 104eA, the front roller collar 104eA, the rear roller collar 104bA, and the rear roller collar 104bA are sequentially fitted in this order, so that rotation and cutting are smoothly guided.
[0043]
When the cutting groove T is formed over almost the entire circumference of 360 ° as described above, the ball screw 105a is further rotated in the same direction to project, for example, the entire stroke, and the cutter 102c is deeply digged into the inner circumferential surface of the concrete structure C. Finally, all the thickness of the concrete structure C (including the anchor bolt 3) is cut through. In this state, the turning handle 103a is again gripped on the ground side and rotated once (360 °), so that full-scale deep cutting is performed over the entire circumference of the concrete structure C (main cutting), and the concrete cutting position is reached. Upper concrete structure (in this example, adjustment concrete Cad, second stage adjustment ring Cru, and most of first stage adjustment ring Crl) and lower concrete structure (in this example, first stage The adjustment ring Crl is divided into a part on the lower end side, a slant wall Csl, a straight wall Cst, and the like. FIG. 9 is a diagram illustrating a state in the middle of the main cutting by the cutter 102c of the in-cutter device 100. FIG. Note that FIG. 2 described above also represents the state at this time.
[0044]
(3) Installation of out cutter
When the cutting of the concrete structure C by the incutter device 100 is completed as described above, the incutter device 100 is lifted and removed from the manhole M to the ground side, and instead, the outcutter device 200 is disposed and the manhole frame 2 outer peripheral side. The road surface R is cut.
[0045]
The detailed structure of the outcutter device 200 will be described below.
[0046]
FIG. 10 is a side sectional view showing the entire structure of the outcutter device 200 together with the arrangement state on the road surface R. FIG.
[0047]
In FIG. 10, the out cutter device 200 presses the inner circumference of the substantially circular manhole frame 2 (or the inner circumference of a substantially annular concrete structure C located below the manhole frame 2 in the same manner) in the radial direction. The center hole unit 201 and the rotary cutting unit 202 are fixed.
[0048]
FIG. 11A is a top view showing the detailed structure of the center hole unit 201, and FIG. 11B is a side sectional view taken along the line XI-XI in FIG.
[0049]
11 (a), 11 (b), and FIG. 10 described above, the center hole unit 201 includes a main body 201a having a center hole S at the radial center and a diameter of the inner periphery of the manhole frame 2. At least three claw portions 201b (3 locations at equal intervals of 120 ° in this example) that are pressed and held in contact with at least three locations in this direction (3 locations at equal intervals of 120 ° in this example), a main body portion 201a, and claw portions And an arm part 201c provided between the two parts.
[0050]
The main body 201a includes, for example, a hole bracket 201aA having the center hole S having a polygonal shape (in this example, a hexagon), and a plurality of locations (in this example, 180 ° intervals in the radial direction outer peripheral side). The ring portion 201aC is connected substantially only through the bridge portion 201aB, and a plurality of locations (in this example, the bridge portion 201aB and the bridge portion 201aB have a 90 ° phase) on the radially outer side of the ring portion 201aC. The ring portion 201aE has a substantially ring shape that is connected only via the bridge portions 201aD at two positions spaced apart by 180 °.
[0051]
By making such a support structure of hole bracket 201aA, bridge part 201aB, ring part 201aC, bridge part 201aD, ring part 201aE, a ring part connected by a bridge, and having a clearance, the structure as a whole can have elasticity. The shaft portion 202A (described later) can be flexibly supported with good followability. In particular, in this example, the phase of the bridge portion 201aB and the bridge portion 201aD is not the same, and the effect is great because they are alternately staggered (in this example, 90 ° intervals).
[0052]
The arm portion 201c is radially extended and arranged on the radially outer peripheral side of the outermost ring portion 201aE (in this example, three locations at equal intervals of 120 °), of which two arm portions 201ca and 201cb are The main body portion 201a and the claw portion 201b are provided so as to be connected to each other. The remaining one arm portion 201cc is shorter than the other two, and the inner peripheral side is fixed to the ring portion 201aE on the outermost peripheral side, while these are connected between the outer peripheral side and the claw portion 201b. A manual jack 201d is provided.
[0053]
In this example, the manual jack 201d expands and contracts by rotating the handle portion 201dA by, for example, human power from the ground side, and changes (distance) the distance between the main body portion 201a and the claw portion 201b. The pressing and gripping force with respect to the manhole frame 2 by the whole of the claw portions 201b can be adjusted.
[0054]
Returning to FIG. 10, the rotary cutting unit 202 includes a shaft portion 202A having a solid structure, a driving portion 202B integrally provided on the upper portion of the shaft portion 202A, and a substantially cylindrical cutter portion 202C. .
[0055]
The shaft portion 202A has, for example, a polygonal shape (in this example, a hexagon), and is inserted into the center hole S of the hole bracket 201aA of the main body portion 201a so as to be movable in the axial direction, and the insertion portion 202Aa For example, a substantially rod-shaped mounting portion 202Ab located at the top, a flange portion 202Ac provided on the outer peripheral side of the mounting portion 202Ab, and a hook for locking a lifting tool such as a lever block B provided on the top of the mounting portion 202Ab. And a stopper 202Ad. The insertion portion 202Aa has a center hole with a predetermined gap Δx (see FIG. 16 described later) interposed so that the axial direction of the shaft portion 202A can be allowed to have a minute angle with respect to the axial direction of the center hole S. S is supported in the radial direction.
[0056]
The drive portion 202B is rotatable to the outer peripheral side of the substantially cylindrical portion 202Ba2 and a base frame 202Ba composed of a substantially disc-shaped flange portion 202Ba1 and a substantially cylindrical portion 202Ba2 positioned below the flange portion 202Ba1. And a cutter support portion 202Bc arranged.
[0057]
The substantially cylindrical portion 202Ba2 is integrally fixed to the outer peripheral side of the mounting portion 202Ab while being placed on the flange portion 202Ac of the shaft portion 202A.
[0058]
The motor 202Bb is vertically arranged on the flange 202Ba1 so that the motor shaft is vertical, and a pinion gear 202Bd is provided at a lower end portion of a motor shaft (not shown) provided through the flange 202Ba1. Is attached. The pinion gear 202Bd meshes with an internal gear 202Be provided on the upper inner peripheral side of the cutter support portion 202Bc, whereby the cutter support portion 202Bc is rotated by the rotational driving force of the motor 202Bb. . The cutter support portion 202Bc is rotatably arranged on the outer peripheral side of the cylindrical portion 202Ba2 via a bearing 202Bf, and is sealed with a seal member 202Bg between the lower surface of the upper flange portion 202Ba1. .
[0059]
A substantially disk-shaped top plate portion 202Bh is fixed to the outer peripheral side of the flange portion 202Ba1, and the outer edge portion thereof is made of, for example, a bellows structure to prevent the dust and the dust from being covered completely. A safety cover 202Bi is attached.
[0060]
The cutter 202C has an inner peripheral edge 202Ca fixed to the outer edge of the cutter support 202Bc via a bolt 202Cb, and rotates with the cutter support 202Bc by the rotational driving force of the motor 202Bb as described above. The road surface R on the outer peripheral side of the manhole frame 2 is cut into a substantially circular shape by teeth (or a blade or a grindstone; not shown) provided at the lower end thereof. The rotational reaction force at this time can be applied to the inner peripheral surface of the manhole frame 2 via the base frame 202Ba, the shaft portion 202A, and the center hole unit 201 of the drive unit 202B.
[0061]
At this time, the cutter 202C includes the fixing structure between the shaft portion 202A and the base frame 202Ba described above, and the arrangement configuration of the cutter support portion 202Bc on the outer peripheral side of the substantially cylindrical portion 202Ba2 and below the flange portion 202Ba1. At the time of cutting, the weights of the shaft portion 202A and the driving portion 202B are finally applied as a propulsive force.
[0062]
(4) Cutting with outcutter device
The outcutter device 200 having the above-described structure is arranged so that the cutter part 200C is positioned on the outer peripheral side of the substantially circular manhole frame 2, and the road surface R is cut. In that case, first, after removing the incutter device 100 as described above, the center hole unit 201 is suspended in the manhole frame 2 and pressed and fixed to the inner periphery thereof. When suspending, the handle portion 201dA of the manual jack 201d is operated in advance so that the corresponding claw portion 201b is sufficiently retracted toward the main body portion 201a, and any of the three claw portions 202b is the inner peripheral surface of the manhole frame 2 Then, it is slowly suspended in the manhole frame 2 while being suspended by, for example, a lever block of a work vehicle.
[0063]
When the center hole unit 201 is arranged at a predetermined height position on the inner peripheral side of the manhole frame 2, the handle portion 201dA of the manual jack 201d is rotated to advance the corresponding claw portion 201b relative to the manhole frame 2. Then, all the three claw portions 201b are brought into contact with the inner peripheral surface of the manhole frame 2, and the manual jack handle portion 201dA is rotated in the same direction to press the inner peripheral surface of the manhole frame 2 with each claw portion 201, The hall unit 201 is firmly fixed. FIG. 12 is a side sectional view showing a state when the center hole unit 201 is fixed (however, the protective cover 4 is not shown).
[0064]
When the center hole unit 201 is fixed as described above, the rotary cutting unit 202 is arranged so that the shaft portion 202A is inserted through the center hole S of the center hole unit 201, and the lower end portion (tooth of the cutter portion 202C) ) On the road surface R. FIG. 13 is a side sectional view showing a state when the rotary cutting unit 202 is mounted (however, the protective cover 4 is not shown).
[0065]
Thereafter, the cutter unit 202C is rotated by the rotational driving force of the motor 202Bb while pressing the cutter unit 202C against the road surface R to be cut by the dead weight of the drive unit 202B, the shaft unit 202A, and the cutter unit 202C, and the road surface (pavement unit) R Is cut from the surface side over the entire depth, and divided into a pavement structure Ri (see FIG. 14 described later) on the inner peripheral side and a pavement structure Ro (see FIG. 14 described later) on the outer peripheral side from the cutting position.
[0066]
(5) Removal of concrete structures
After cutting into the pavement structures Ri and Ro by the above-described out cutter device 200, the removal target portion is removed outside the manhole M using the hydraulic camber device 300. FIG. 14 is a side cross-sectional view showing the state at the time of removal.
[0067]
In FIG. 14, when removing, first, the upper concrete structure divided by the cutter 102c of the incutter device 100 (in this example, the adjustment concrete Cad, the second adjustment ring Cru, and the first stage Most of the adjustment ring Crl of the first, hereinafter referred to as the upper concrete structure Cad, Cru, Crl as appropriate, and the lower concrete structure (in this example, the lower end portion of the first stage adjustment ring Crl, the slant wall The hydraulic camber device 300 is engaged with a boundary surface with Csl, straight wall Cst, etc. (hereinafter appropriately referred to as lower concrete structures Crl, Csl, Cst).
[0068]
The hydraulic camber apparatus 300 includes a bottom part 300Aa and a hydraulic cylinder part 300A composed of a rod part 300Ab extending and retracting from the bottom part 300Aa, a pointed part 300B attached to the outer side of the bottom part 300Aa, and a rod part. It further includes a point 300C attached to the outer side of 300Ab.
[0069]
The hydraulic camber apparatus 300 having the above structure is suspended in the concrete structure C as shown in FIG. When suspending, the hydraulic cylinder portion 300A is shortened in advance so that the tip portions 300B and 300C do not interfere with the inner peripheral surface of the concrete structure C, and then suspended by, for example, the lever block B of a work vehicle. Then slowly hang it.
[0070]
When the hydraulic camber device 300 has been disposed at a predetermined height position on the inner periphery side of the concrete structure C, the hydraulic cylinder portion 300A is extended to advance the tip portions 300B and 300C relative to the manhole frame 2, and the upper concrete structure The tip portions 300B and 300C are bitten into the boundary surfaces (= cut surfaces by the incutter device 100) between Cad, Cru and Crl and the lower concrete structures Crl, Csl and Cst.
[0071]
If it bites in like this, it will be lifted out of the manhole M with the hydraulic camber apparatus 300 in the state as it is. As a result, the upper concrete structure Cad, Cru, Crl located at the upper part of the hydraulic camber apparatus 300 is divided by the cutter unit 202C of the outcutter apparatus 200 and the pavement structure Ri on the inner peripheral side and the manhole fixed thereto. It is lifted together with the frame 2 and removed to the ground side. FIG. 14 shows a state immediately after the start of lifting.
[0072]
(6) Installation of new concrete structures and filling
When the upper concrete structures Cad, Cru, Crl, the inner periphery side pavement structure Ri, and the manhole frame 2 are removed as described above, a new upper concrete structure CadN, CruN, CrlN, the manhole frame 2N, the inner periphery are replaced. Side pavement structure RiN is installed.
[0073]
As a procedure at this time, after removing the remaining portion of the first stage adjustment ring Crl and the tip of the anchor bolt 3 remaining in the upper end of the inclined wall Csl, the first stage adjustment ring Crl is removed. A new first-stage adjustment ring CrlN is suspended and installed in the manhole M in the same manner as described above, and a second-stage adjustment ring Cru is further suspended and installed thereon. On top of that, to make the new manhole frame 2N and manhole cover 1N correspond to the height of the original road surface R, adjustment concrete CadN is placed on the spot, and finally, the new anchor bolt 3N is adjusted. From the upper part of the manhole frame 2N provided on the top of the concrete CadN, the manhole frame 2N, the adjustment concrete CadN, the adjustment ring CruN, the adjustment ring CrlN, and Through the adjustment ring Crl remaining portion of the, fastened by reach the tip portion to the upper end portion of the inclined wall Csl.
[0074]
After that, a predetermined filler (for example, mortar) is filled between the new manhole frame 2N and the remaining outer side pavement structure Ro. FIG. 15 is a side cross-sectional view showing a state in which all the reconstruction has been completed as described above.
[0075]
According to the renovation construction method of the present embodiment configured as described above, the following effects can be obtained.
[0076]
(1) Effects in outcutter device
(1-1) Simplification and miniaturization of equipment configuration
In the out cutter apparatus 200 used in the present embodiment, a substantially cylindrical cutter unit 202C, a driving unit 202B that rotates the cutter unit 202C, and a shaft unit 202A that serves as a rotation center of the cutter unit 202C are integrally configured as a rotary cutting unit 202. The shaft portion 202A is inserted into the center hole S of the center hole unit 201 fixed to the manhole frame 2. As a result, since the weight of the drive unit 202B and the shaft unit 202A is added to the cutter unit 202C at the time of cutting, a hydraulic cylinder for propulsion like the conventional structure can be made unnecessary by using this as a propulsive force. . Thereby, simplification and size reduction of an apparatus structure can be achieved. Further, since the center hole unit 201 on the insertion side and the rotary cutting unit 202 on the insertion side can be completely separated from each other, this also simplifies and reduces the size of the apparatus. be able to. Moreover, by separating into two, as a result of reducing the machine weight per one, for example, handling at the time of transportation and operation of the apparatus can be facilitated.
[0077]
On the other hand, the center hole unit 201 is a relatively lightweight machine separated from the rotary cutting unit 202 including the shaft portion 202A, the drive portion 202B, the cutter portion 202C, and the like. Therefore, at the start of construction, as described with reference to FIG. 12, this lightweight center hole unit 201 is fixed to the inner peripheral side of the manhole frame 2 and then the rotary cutting unit 202 is mounted. It's enough. As a result, when the center hole unit 201 is fixed, it is not necessary to use a hydraulic cylinder for a gripper unlike the conventional structure, and a manual jack 201d by human power is sufficient. By eliminating the need for the hydraulic cylinder in this way, the apparatus configuration can be further simplified. In the conventional structure using a hydraulic cylinder, the support shaft actually needs to have a hollow structure in order to allow the hydraulic piping to pass through. However, in this embodiment, the shaft portion 202A is simply solid without such a need. It can be a structure. As a result, the structure can be simplified as well, and the diameter of the shaft (shaft portion) necessary for ensuring the same strength can be reduced, whereby the radial size can be reduced.
[0078]
(1-2) Effect on uneven road surface
Furthermore, by adopting a structure in which a shaft 202A integrated with the cutter 202C is inserted into the center hole S of the center hole unit 201 fixed to the manhole frame 2, as shown in FIG. When the axis (in other words, the axis of the cutter unit 202C) α is about to tilt from the axis β of the manhole frame 2 or the like, the rotation center position P is the coupling position of the drive unit 202B and the shaft unit 202A (base frame 202Ba and shaft unit 202A). It is near the center hole S that is spaced downward from the fixed portion. Therefore, compared to the conventional structure in which the rotation center is the support shaft penetrating portion of the drive unit in the same case, the inclination is more easily allowed as the rotation center is further away. As a result, even when the road surface R ′ having a local slope or a slightly uneven shape is cut instead of a uniform slope, the axis α of the cutter portion 202C is slightly inclined according to this. Flexible cutting is possible, so that smooth and efficient construction can be performed.
[0079]
At this time, as described above, the insertion portion 202Aa of the shaft portion 202A has a predetermined gap Δx so as to allow the axis α of the cutter 202C to have a minute angle with respect to the axis β of the center hole S. Is supported in the radial direction by the center hole S. By providing the gap Δx in this way, the inclination of the axis α of the cutter portion 202C can be more easily allowed, and the followability to the uneven road surface R ′ can be further improved.
[0080]
(1-3) Other
The downsizing of the equipment configuration can reduce noise and vibration to residents around the manhole repair work. Moreover, it can suppress that the running vehicle is obstructed. In addition, it is possible to speed up the construction by improving the efficiency especially on the road surface R ′ having an uneven shape or the like. Therefore, when the vehicle traffic is cut off, the time can be shortened and the construction cost can be reduced. .
[0081]
(2) Effects of using an incutter device
(2-1) Improvement of durability
In the renovation construction method of the present embodiment, the substantially disc-shaped cutter 102c of the incutter device 100 is arranged on the inner peripheral side of the concrete structure C, rotated and cut over the entire periphery, and the concrete structure Cad above this is cut. , Cru, Crl are lifted and removed together with the inner peripheral side pavement structure Ri cut by the substantially cylindrical cutter 202C of the out-cutter device 200. Then, new concrete structures CadN, CruN, CrlN, a manhole frame 2N, and a predetermined filler (inner side pavement structure) RiN are sequentially installed and finished in the removed portion. By such a method, only the concrete structure part to be removed can be clearly divided and removed, so there is no distortion or damage to the remaining part as in the case of using the conventional breaker, As a result, the durability after the reconstruction can be surely improved.
[0082]
(2-2) Improvement of cutter blade life
Further, as described above, the incutter device 100 can stabilize the trajectory of the substantially disc-shaped cutter 102c, and more efficiently and smoothly cut the substantially disc-shaped cutter 102c over the entire circumference in a substantially horizontal plane. As a result, it is possible to reliably prevent inadvertent damages caused by misalignment, etc., thus further improving durability. In addition, since cutting is completed on almost one plane and there is no blur (the cutting track is stable), there is also an effect that wear of the cutter blade can be minimized. This also reduces construction costs.
[0083]
In addition, when an uneven surface or an inclined surface (which may be a uniform inclined surface) as described with reference to FIG. 16 is a construction target, a predetermined jig (stabilizing table) corresponding to this is also used for the incutter device 100. Thus, even in such a case, it becomes possible to perform stable construction without blurring. Details will be described below.
[0084]
FIG. 17 is a perspective view showing the overall structure of a stabilization table that stabilizes the cutting track of the incutter device 100.
[0085]
In FIG. 17, the stabilizing base 400 includes a sliding face plate 400H, an intermediate plate 400M, and a bottom plate 400L, which are substantially annular plates each having a circular opening at the center side. The sliding face plate 400H and the intermediate plate 400M are connected to each other by three struts 401 arranged in a substantially vertical direction at a plurality of locations in the circumferential direction (three locations at equal intervals of 120 ° in this example). . Between the intermediate plate 400M and the bottom plate 400L, three adjustment bolts 402 arranged in a substantially vertical direction and a plurality of adjustment bolts 402 are screwed together at a plurality of locations in the circumferential direction (three locations at equal intervals of 120 ° in this example). The upper and lower nuts 403U and 403L are connected to each other. At this time, the phases of the three support columns 401 and the three adjustment bolts 402 are alternately staggered (60 ° intervals in this example).
[0086]
FIG. 18 is a side cross-sectional view showing a state in which the concrete structure is being cut in the manhole M provided on the sloped road surface R ″ by the incutter device 100 using the stabilization table 400 having the above-described configuration.
[0087]
In FIG. 18, before installing the incutter device 100, in order to secure a horizontal plane regardless of the inclination of the manhole frame 2, the upper and lower nuts 403U and 403L screwed to the adjustment bolts 402 are operated to Adjust the position. Then, an angle is formed between the intermediate plate 400M and the bottom plate 400L so as to correspond to the inclination angle of the road surface R ″, and the intermediate plate 400M and the sliding surface plate 400H are horizontal surfaces even in the manhole frame 2 in which the bottom plate 400L is inclined. Like that.
[0088]
In this state, the incutter device 100 is suspended in the manhole M from the central side openings of the sliding face plate 400H, the intermediate plate 400M, and the bottom plate 400L as described above, and the handle body 103a is placed on the sliding face plate 400H. And let it stand still in this state. When the handle main body 103a is rotated 360 °, the handle main body 103a may be rotated while sliding on the sliding face plate 400H. As a result, the orbit of the cutter 102c can be stably completed in a substantially horizontal plane, so that the cutter 102c can be cut more efficiently and smoothly.
[0089]
The structure of the stabilizing base is not limited to the above. For example, by inserting screw jacks into brackets provided at a plurality of locations on the outer periphery of a simple cylinder and adjusting the protruding height of each jack from the bracket, The upper surface may be substantially horizontal, and the handle main body 103a may be placed on the substantially horizontal cylindrical upper surface instead of the sliding surface plate 400H. In this case, the same effect is obtained.
[0090]
(2-3) Other
By cutting the concrete structure C from the inside of the manhole M, for example, the manhole M having the anchor bolt 3 can be quickly renovated with low vibration and low noise.
[0091]
In the above embodiment, the incutter device 100 allows the concrete structure above the cutting position (adjustment concrete Cad, second-stage adjustment ring Cru, and most of the first-stage adjustment ring Crl) and the lower part. After the upper concrete structure Cad, Cru, Crl is removed by dividing into a concrete structure (that is, a part of the lower end side of the first-stage adjustment ring Crl, a slant wall Csl, a straight wall Cst, etc.) New upper concrete structures CadN, CruN, and CrlN corresponding to the above were installed. That is, a new first-stage adjustment ring CrlN is suspended and installed in the manhole M in the same manner as described above on the remaining portion of the first-stage adjustment ring Crl, and the second-stage adjustment ring is further provided thereon. The ring Cru was suspended and installed, and further, a new manhole frame 2N and a manhole cover 1N were placed on the spot for adjusting concrete CadN to correspond to the height of the original road surface R. Since the adjustment rings CruN and CrlN are concrete II secondary products and have established standards, the surplus and half of the adjustment rings were adjusted by placing on-site adjustment concrete CadN.
[0092]
However, in consideration of the thickness direction dimensions of the adjustment rings CruN and CrlN that are newly loaded in advance, the incutter device 100 cuts a position where the identity of the manhole frame 2 and the road surface R can be ensured only by stacking them (ie, If the adjustment ring is cut by the thickness of the adjustment ring, the above-mentioned adjustment concrete CadN placed in the field should be unnecessary.
[0093]
Such modifications will be described below with reference to FIGS. 19A, 19B, and 19C. The same parts as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
[0094]
FIG. 19A is a side sectional view showing the manhole upper structure of this modification before the reconstruction, and FIG. 19B is a side sectional view showing the concept of setting the cutting position of the incutter device 100 at the time of reconstruction. .
[0095]
In FIG. 19A, in this example, the concrete structure C is composed of a straight wall Cst, a slant wall Csl, an adjustment ring Cr, an adjustment concrete Cad, and the like. A manhole cover 1 supported by the road surface R is provided, which is substantially the same as the height of the road surface R.
[0096]
Here, in this modification, as shown in FIG. 19 (b), the thickness of the upper concrete structure that removes the cutting position by the incutter device 100 to the ground side is the ready-made concrete ring member ( Adjustment ring) It is set to be substantially the same as the thickness t of CrN, and cutting is performed at that position Q (in this example, near the lower end portion of the adjustment ring Cr) (in other words, the cutting position Q is set at the position of the manhole frame 2). The position is lower than the lower end by the thickness t of the adjustment ring CrN). Then, after removing the upper concrete structure Cr (thickness t) above the position Q, a concrete ring member CrN having substantially the same thickness t as a new concrete structure is left as the remaining lower concrete structure ( In this example, the adjustment ring Cr is installed on a part of the lower end side of the adjustment ring Cr, the slant wall Csl and the straight wall Cst) and bonded. Finally, instead of the anchor bolt 3, the manhole frame 2N is fixed to the ring member CrN by, for example, set bolts 3 'provided at three locations in the circumferential direction. FIG. 19C shows the state at this time.
[0097]
As described above, by making the thickness of the upper concrete structures Cad, Cru, Crl to be removed substantially the same as the ready-made concrete ring member (adjustment ring) CrN, It is only necessary to install the ring member (thickness t), which is an off-the-shelf product, and there is no need to place adjustment concrete that is usually performed at the site in order to fill the surplus space. Thereby, shortening of a construction period and cost reduction can be aimed at.
[0098]
【The invention's effect】
According to the present invention, since only the portion to be removed of the concrete structure can be clearly separated and removed using the incutter device, the remaining portion is distorted or damaged as in the case of using the conventional breaker. Etc., and as a result, the durability after the reconstruction can be surely improved.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an upper structure of a manhole to which a renovation construction method according to an embodiment of the present invention is applied.
FIG. 2 is a side sectional view showing the entire structure of the incutter device together with the arrangement state in the concrete structure.
FIG. 3 is a top view seen from the direction III in FIG. 2;
FIG. 4 is an enlarged extracted top view showing a detailed structure of a base portion, a drive portion, and a guide roller portion that constitute the incutter device.
5 is a side view seen from the direction V in FIG. 4. FIG.
FIG. 6 is a diagram illustrating a state where the incutter device is suspended in a manhole.
FIG. 7 is a diagram illustrating a state in which the cutter of the in-cutter device is in contact with the peripheral surface of the concrete structure.
FIG. 8 is a diagram showing a state immediately after the start of pre-cutting by the cutter of the in-cutter device.
FIG. 9 is a diagram showing a state during the main cutting by the cutter of the in-cutter device.
FIG. 10 is a side cross-sectional view showing the overall structure of the outcutter device together with the state of arrangement on the road surface.
11 is a top view showing the detailed structure of the center hole unit, and a side cross section taken along the line XI-XI in FIG.
FIG. 12 is a side sectional view showing a state when the center hole unit is fixed.
FIG. 13 is a side sectional view showing a state when the rotary cutting unit is mounted.
FIG. 14 is a side sectional view showing a state when the hydraulic camber device is removed.
FIG. 15 is a side sectional view showing a state in which all the renovations have been completed.
FIG. 16 is a diagram illustrating a state in which the axis of the shaft portion (axis of the cutter portion) is inclined from the axis of the manhole frame when cutting a road surface such as an uneven surface or a locally inclined surface.
FIG. 17 is a perspective view showing the overall structure of a stabilization table for stabilizing the cutting track of the incutter device.
18 is a side sectional view showing a state in which a concrete structure is being cut in a manhole provided on a sloping road surface by an incutter device using the stabilizer shown in FIG.
FIG. 19 is a side sectional view showing a manhole superstructure, basic principles, and post-renovation before remodeling of a modified example that does not require adjustment concrete placed on site.
[Explanation of symbols]
2 New manhole frame
2N manhole frame
100 incutter device
102c cutter
200 Outcutter device
202C cutter unit
C Concrete structure
Cad adjustment concrete
CadN New adjustment concrete
Cr adjustment ring
Crl 1st stage adjustment ring
CrlN New first stage adjustment ring
Cru 2nd stage adjustment ring
CruN New second stage adjustment ring
Csl wall
Cst straight wall
R Pavement (road surface)
Ri Inner side pavement structure
Ro Outer pavement structure

Claims (6)

A substantially disc-shaped cutter of the incutter device is disposed on the inner peripheral side of the substantially annular concrete structure located below the substantially circular manhole frame,
Rotating the substantially disc-shaped cutter to cut the concrete structure over the entire circumference from the inner peripheral side, dividing into a concrete structure at the upper part and a lower concrete structure from the cutting position,
On the pavement on the outer peripheral side of the manhole frame, a substantially cylindrical cutter of the out cutter device is disposed,
Rotating the substantially cylindrical cutter to cut the pavement part over the entire depth from the surface side, dividing into a pavement structure on the inner peripheral side and a pavement structure on the outer peripheral side from the cutting position,
The upper concrete structure divided by the substantially disc-shaped cutter of the in-cutter device is fixed to the inner peripheral pavement structure divided by the substantially cylindrical cutter of the out-cutter device and the same. Lift up with the manhole frame and remove it to the ground side,
A new concrete structure corresponding to the removed upper concrete structure is installed on the remaining lower concrete structure,
Furthermore, a new manhole frame is installed above the new concrete structure, and a predetermined filler is filled between the new manhole frame and the remaining pavement structure on the outer peripheral side. Manhole reconstruction method. In the manhole renovation construction method according to claim 1,
In the cutting of the incutter device, first, pre-cutting is performed over the entire circumference in a state where the substantially disc-shaped cutter is shallowly biting into the inner peripheral surface of the concrete structure, and grooves are formed around the entire inner peripheral surface. Forming,
Thereafter, in the in-cutter device, a plurality of rollers arranged in substantially the same horizontal plane as the substantially disc-shaped cutter are inserted into the grooves formed on the entire circumference, and the substantially disc-shaped cutter is further used as a guide. A manhole renovation method, wherein the concrete structure is fully cut from the inner peripheral side over the entire periphery while being deeply cut in, and the division is performed. In the manhole renovation construction method according to claim 1 or 2,
The cutting position by the substantially disc-shaped cutter of the incutter device is set so that the thickness of the upper concrete structure to be removed to the ground side is substantially the same as the thickness of the ready-made concrete ring member. ,
A manhole remodeling method, wherein the concrete ring member is installed on the remaining lower concrete structure as the new concrete structure. A base portion disposed substantially horizontally on the inner peripheral side of the substantially annular concrete structure located below the substantially circular manhole frame;
A motor that generates a rotational driving force, and a substantially disk-shaped cutter that rotates by the rotational driving force of the motor and cuts the inner peripheral side of the concrete structure; A drive unit provided on the inner circumference side so as to be capable of being viewed, and
The lower end side is connected to the base portion and the upper end side is arranged so as to appear on the ground side outside the manhole, and a turning handle portion that can be gripped and rotated by human power,
A guide roller portion that includes a plurality of rollers that abut on the inner peripheral side of the concrete structure while rotating in a substantially horizontal plane, and that is connected to the base portion and guides the rotation of the base portion by the operation of the turning handle portion. An incutter device for manhole renovation construction, characterized by comprising: In an incutter device for manhole reconstruction construction according to claim 4,
Each roller of the guide roller portion is disposed in substantially the same horizontal plane as the cutter, and has a thickness substantially equal to or less than the thickness of the cutter, and can penetrate into a cutting groove cut by the cutter of the driving portion. An incutter device for manhole renovation construction, characterized by having a ridge projecting from the manhole. In an incutter device for manhole reconstruction work according to claim 4 or 5,
The plurality of rollers of the guide roller portion includes a pressure roller that is connected to the base portion via a spring and presses the inner peripheral side of the concrete structure with an urging force of the spring. Incutter device for renovation work.

Images