JP2771455B2 - Manhole removal and repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing and repairing manholes.

[0002]

2. Description of the Related Art For example, a road surface cutting device disclosed in Japanese Patent Publication No. 61-52283 is known as a device for circularly cutting a pavement plate around a manhole when replacing or repairing the manhole. . The cutting device disclosed in this publication includes a shaft hanging on a manhole cover,
A rotatable cylindrical bit fitted to the shaft so as to be slidable in the axial direction, a motor for rotating the cylindrical bit, and a power transmission mechanism provided between the motor and the cylindrical bit. And a vertical feed mechanism for adjusting the cutting depth of the cylindrical bit.

When a manhole is removed and repaired by using such a cutting device, a circular cutting groove is formed on the outer periphery of the manhole, and an inner peripheral side separates a ring-shaped pavement plate portion integrally attached to the manhole. The ring-shaped pavement slab is, for example, crushed and removed by a breaker or the like, after which the manhole is removed, a new manhole is installed, and thereafter, a new ring-shaped pavement slab around the new manhole is removed. Performed by construction.

[0004] However, if the ring-shaped pavement slab is entirely crushed by a breaker in the manhole removing and repairing method as described above, it takes time, and vibration and noise during crushing and removal become problems. Therefore, Japanese Patent Publication No. 61-339
No. 38 discloses a method of removing a ring-shaped pavement slab separated by a cutting groove together with a manhole without crushing.

[0005] According to the manhole removal and repair method disclosed in this publication, the ring-shaped pavement slab is not crushed and removed at the construction site, so that problems of vibration and noise are reduced. However, the manhole removal and repair method disclosed in this publication has the following technical problems.

[0006]

That is, in this type of removal and rehabilitation method, a ring-shaped pavement slab newly constructed on the outer periphery of a manhole must be sufficiently compressed to have a high density. The ring-shaped pavement slab sinks due to running, etc., and repair work is required again. For this reason, even in the method disclosed in the above-mentioned publication, pressure is applied to the ring-shaped pavement slab by a vibrating rolling plate.

However, in the method of removing the ring-shaped pavement slab integrally with the manhole, if the width of the ring-shaped pavement slab is increased, the entire weight of the part to be removed increases, and the ring-shaped pavement slab is removed from the inside of the manhole. The limited stroke of the tool separating the part from the ground makes it difficult to remove them as one. For this reason, in the method disclosed in the above method, the width of the ring-shaped pavement slab is not sufficiently ensured, and when the width of the ring-shaped pavement slab to be newly constructed is narrow, a large rolling machine cannot be used. However, there is a problem that the compaction of the newly constructed ring-shaped pavement slab becomes insufficient.

The present invention has been made in view of such conventional problems, and a first object of the present invention is to reduce the generation of noise and vibration and to tighten a newly constructed ring-shaped pavement plate. An object of the present invention is to provide a method for removing and rehabilitating manholes that can be sufficiently compacted. A second object is to provide a manhole removing and repairing method capable of preventing scattering of water and cutting powder when forming a cutting groove in a pavement plate.

[0009]

In order to achieve the above object, the present invention provides a method for removing a circular manhole buried in a paving slab, wherein a substantially concentric cutting groove is formed on an outer periphery of the manhole. An inner peripheral edge adheres to the manhole, an outer peripheral edge separates a ring-shaped pavement plate portion separated from the pavement plate by the cutting groove, and after removing the ring-shaped pavement plate portion and the manhole, the removed portion is removed. In the manhole removal and repair method of installing a new manhole at the outer periphery and constructing a new ring-shaped pavement portion around the outer periphery, when forming the cutting groove, double cutting grooves having different diameters on the outer periphery of the manhole. Forming the ring-shaped pavement plate portion and the
The ring-shaped pavement portion is separated from the second ring-shaped pavement plate portion located on the outside, and the ring-shaped pavement plate portion is crushed and removed by driving and lifting a wedge-shaped member into a cutting groove on the inner peripheral side. and wherein the fracturing removing the second ring-shaped pavement portion of the outer peripheral side of the plate portion.

In another aspect of the invention, when removing a circular manhole buried in a pavement plate, a substantially concentric cutting groove is formed on the outer periphery of the manhole, and an inner peripheral edge adheres to the manhole, and periphery is隔成the ring pavement portion separated from the pavement by the cutting groove, after removing the said manhole and the ring-shaped pavement section by mounting a new manhole to the removal portion, the outer periphery thereof In the manhole removal and repair method for constructing a new ring-shaped pavement slab, when forming the cutting groove, the ring-shaped pavement slab is formed by forming double cutting grooves having different diameters on the outer periphery of the manhole. And a second ring-shaped pavement slab located outside thereof, and a second ring-shaped pavement slab on the outer peripheral side of the ring-shaped pavement slab.
After a part of the ring-shaped pavement slab is peeled off and a wedge-shaped member is driven between the peeled part and the ground between the ring-shaped pavement slab and the ground to crush and remove the ring-shaped pavement slab, the second ring The remaining portion of the pavement slab is crushed and removed.

In the above invention, the double cutting groove is formed by a double cylindrical cutting bit, and when forming the cutting groove with the cutting bit, water injected into the outer periphery of the cutting bit is collected. An annular bit cover can be provided to eliminate. As still another invention, when removing a circular manhole embedded in a pavement plate, a substantially concentric cutting groove is formed on the outer periphery of the manhole, and a ring-shaped pavement plate portion separated by the cutting groove and After removing the manhole and installing a new manhole in the removed part, in the removal and repair method of the manhole to construct a new ring-shaped paving slab on the outer periphery, when forming the cut groove,
An inner peripheral groove adjacent to the outer peripheral edge of the manhole and an outer peripheral groove formed at a predetermined interval from the inner peripheral groove, and after removing the manhole, crushing and removing the ring-shaped pavement plate portion. Features.

The crushing and removal of the ring-shaped pavement slab can be performed by driving a wedge-shaped member from the inner peripheral side between the ring-shaped pavement slab and the ground. The inner and outer circumferential grooves are formed by a double cylindrical cutting bit, and an auxiliary bit projecting inward can be provided on the inner peripheral surface of the inner cylindrical portion of the cutting bit.

[0013]

According to the manhole removing and repairing method of the above construction, double cut grooves having different diameters are formed on the outer periphery of the manhole to separate the ring-shaped pavement plate portion from the second ring-shaped pavement plate portion. Then, the ring-shaped pavement plate portion is crushed and removed by driving and lifting a wedge-shaped member into the cutting groove on the inner peripheral side, and thereafter, the second ring-shaped pavement plate portion on the outer peripheral side of the ring-shaped pavement plate portion is crushed and removed. A new wide ring-shaped pavement slab can be constructed on the outer periphery of the installed manhole.

According to the second aspect of the present invention, double cutting grooves having different diameters are formed on the outer periphery of the manhole to separate the ring-shaped paving plate portion from the second ring-shaped paving plate portion, and the ring-shaped paving plate portion is formed. A part of the second ring-shaped pavement slab on the outer peripheral side of the ring-shaped pavement slab is removed, and a wedge-shaped member is driven between the ring-shaped pavement slab and the ground from the removed portion to crush the ring-shaped pavement slab. After the removal, the remaining portion of the second ring-shaped pavement slab is crushed and removed, so that a new wide ring-shaped pavement slab can be constructed around the installed manhole.

According to a third aspect of the present invention, the double cutting groove is formed by a double cylindrical cutting bit, and when the cutting groove is formed by the cutting bit, water is injected into the outer periphery of the cutting bit. Since an annular bit cover is provided to collect and remove the water, scattering of water and cutting powder is prevented. According to the fourth aspect of the present invention, since the inner peripheral groove is formed adjacent to the outer peripheral edge of the manhole, the paving slab adhering to the outer peripheral edge of the manhole is removed when this groove is formed. Can be. In this case, according to the configuration of claim 5, the crushing and removal of the ring-shaped pavement slab is performed by driving the wedge-shaped member from the inner peripheral side between the ring-shaped pavement slab and the ground. The deformation of the outer peripheral shape of the pavement slab can be prevented.

Further, according to the structure of the sixth aspect, the inner and outer circumferential grooves are formed by double cylindrical cutting bits,
An auxiliary bit protruding inward is provided on the inner peripheral surface of the inner cylindrical portion of the cutting bit, so that when forming a groove, the pavement plate attached to the outer peripheral edge of the manhole is more reliably removed. In addition, for example, also in the case of a stepped manhole structure, the pavement plate attached to the upper side of the manhole can be removed.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 12 show a first embodiment of a manhole removing and repairing method according to the present invention. 1 to 5 are process cross-sectional views showing a manhole A removal and repair method in the order of processes.
Shows an example of a perforator used for the removal and rehabilitation method.

The drilling apparatus used in the removal and repair method of the present invention includes a cylindrical cutting bit 10, a drilling machine 12, a guide column 14, a hydraulically driven cylinder (first actuator) 16, a turning stage 18, , A swing cylinder (second actuator) 20 and a swing cylinder 22 (third actuator).
An actuator), a frame 24, a guide frame 26, and a horizontal cylinder (a fourth actuator) 28.

As shown in detail in FIG. 7, the cylindrical cutting bit 10 is formed in a double cylindrical shape having an upper end closed and an open lower end, and has a disc-shaped end plate 10a and an end plate 10a. 10
A has an outer cylindrical portion 10b and an inner cylindrical portion 10c fixed to the lower end surface of the cylindrical member 10a, and a diamond bit 10d is fixed to the tip of each of the cylindrical portions 10b and 10c. Further, in this embodiment, the outer cylinder portion 10b is formed shorter than the inner cylinder portion 10c, and the bit 10d on the inner cylinder portion 10c side comes into contact with the cutting target surface in advance.

At the center of the end plate 10, a through hole 10e for inserting a water supply shaft of a water injector to be described later is formed, and a plurality of mounting holes 10f are formed on the outer periphery of the through hole 10e. I have. The mounting hole 10f is for fixing a bit flange 10g mounted on the upper surface of the end plate 10a. The cylindrical cutting bit 10 has an upper end side formed by a drilling machine 12 through the bit flange 10g. Supported by

When cutting the roadbed surface or the like with the cylindrical cutting bit 10, water is supplied from a water injector described later in order to reduce cooling and wear of the diamond bit 10d. Since the centrifugal force acts on the water supplied from the part 10c side by the rotation of the cutting bit 10, the supplied water also flows to the outer cylinder part 10b side, and the length of the outer cylinder part 10b side is changed to the inner cylinder part. There is no problem even if it is smaller than 10c.

FIG. 8 shows the details of the drilling machine 12. The drilling machine 12 shown in FIG. 1 drives the cylindrical bit 10 to be rotated by a hydraulic motor 12a, and has a hollow housing 12b that supports the hydraulic motor 12a. A hollow cylindrical rotary shaft 12c is provided in the housing 12b.
Are rotatably arranged in the vertical direction via bearings, and a bit flange 10g is fixedly provided at the lower end of the rotating shaft 12c.

A large-diameter driven gear 12d is fixedly mounted on the outer periphery of the rotating shaft 12c, and a small-diameter driving gear 12e meshes with the driven gear 12d.
The rotation shaft of the hydraulic motor 12a is connected to e.
With the above configuration, when the hydraulic motor 12a is driven, its rotational force is transmitted to the rotary shaft 12c via the driving and driven gears 12e and 12d. As a result, the cylindrical cutting bit 10 It is driven to rotate in the opposite direction.

The member denoted by reference numeral 30a in FIG. 8 is a water supply shaft of the water injector 30 arranged so as to pass through the center of the rotary shaft 12c of the drilling machine 12.
At the tip of Oa, a water sprinkling section 30b is provided inside the cylindrical cutting bit 10 and disposed on the upper side thereof. The water supply shaft 30a has a water supply hole 30 penetrating in the axial direction.
The water supply hole 30c communicates with a water spray hole 30d provided in the water spray portion 30b, and a water spray nozzle 30e is attached to an open end of the water spray hole 30d.

The guide support 14 has a beam 14a, a guide rail 14b fixedly provided on the front side of the beam 14a at a predetermined interval, and a front side of the guide rail 14b. It has fixed and movable frames 14c and 14d extending in a direction perpendicular to the axial direction and provided so as to face each other.

The fixed frame 14c is
b is fixed to the upper end side, and the upper end of the water supply shaft 30a is supported on the distal end side. The movable frame 14d has a plurality of rollers 14e that roll along the guide rails 14d, and is installed movably in the longitudinal axis direction of the guide rails 14d. In addition, this movable frame 14d includes:
A housing 12b of the drilling machine 12 is supported via a hinge plate 14f.

A cylinder 16 is disposed between the fixed frame 14c and the movable frame 14d. By driving the cylinder 16 to expand and contract, the cylindrical cutting bit 10 and the drilling machine 12 are connected to the longitudinal axis of the guide rail 14b. It moves along the direction. A mounting plate 14g is fixedly provided on the back side of the beam 14a of the guide column 14,
The mounting plate 14g is pin-coupled to a support plate 18a fixedly provided on the upper surface side of the turning stage 18, and the guide column 14 is swingably supported by the turning stage 18 by this configuration.

6 or FIG.
The member indicated by 4h is a support leg projecting from the lower end of the guide rail 14b. Further, the support plate 18a and the beam 14
a swing cylinder 20 is arranged between
By driving the oscillating cylinder 20 to expand and contract, the guide column 14 holding the cylindrical bit 10 and the punch 12 is held.
Are swingable within an angular range from a substantially horizontal state (see FIG. 6) to a substantially vertical state (see FIG. 10).

The turning stage 18 has a base 18a formed in a square shape and a disk portion 18b provided in the shape of the base 18a, and is formed in a substantially U-shaped plane as shown in FIG. The frame 24 is rotatably supported at its center. A swivel cylinder 22 is arranged between the frame 24 and the swivel stage 18. The swivel cylinder 22 has a base side fixed to the frame 24 and a telescopic plunger at the base 18 of the swivel stage 18.
The turning stage 24 is rotated left and right around the disk portion 18b by extending and retracting the turning cylinder 22 as shown by a virtual line in FIG.

At both ends of the frame 24, a plurality of guide rollers 24a are pivotally mounted.
Is the guide frame 2 placed on the carrier 34 of the vehicle 32
6 along the longitudinal axis direction. The guide frame 26 is a pair of long frame members 2 that extend in parallel at a predetermined interval along the longitudinal direction of the bed 34.
6a and a short frame member 26b fixed so as to be orthogonal to the long frame member 26a, and the guide roller 24a rolls in the extending direction of the long frame member 26a.

A horizontal cylinder 28 is provided between the frame 24 and the guide frame 26.
Is horizontally moved along the direction of the longitudinal axis of the guide frame 26, and the guide column 14 is positioned outside the end of the carrier 34 in a state where the horizontal cylinder 28 is extended most.

The vehicle 32 has a water injector 30 in front of a loading bed 34.
A water tank 36 connected to the water supply shaft 30a is mounted. In addition, below the loading platform 34, each cylinder 16,
A hydraulic control unit 38 for supplying hydraulic pressure to 20, 22, and 28 and controlling expansion and contraction thereof, and a vacuum unit 40 for supplying suction air to a bit cover described later are provided.

Incidentally, reference numeral 4 shown in FIG. 7 or FIG.
Reference numeral 2 denotes a hydraulically driven outrigger attached to the vehicle 32 for fixing the vehicle 32 to a predetermined place. FIG.
2 shows a control unit of the cylinder 16 and the hydraulic motor 12a of the drilling machine 12 in the hydraulic control unit 38 extracted. The hydraulic control unit 38 shown in the figure has a high-speed response control valve 38a connected to the cylinder 16, and a proportional flow control valve 38b connected to the hydraulic motor 12a.

An output side of a comparator 38c is connected to a control terminal of the high-speed response control valve 38a, and a first input section 38d is connected to the comparator 38c, and cutting is performed from the first input section 38d. The bit cutting amount of the bit 10, the bit lowering speed, the bit raising speed, and the set torque value of the hydraulic motor 12a are initialized. Further, the comparator 38c includes:
The output side of the calculating means 38e is connected,
e shows the detection values (PH1, PH1) of the pressure sensors 38f, 38g provided on the high pressure side and the low pressure side of the hydraulic motor 12a.
2) is input via the amplifiers 38h and 38i.

In the calculating means 38e, the sensor 34
Since the difference Δp between the detected values f and 34g (PH1, PH2) is proportional to the torque T of the hydraulic motor 12a, the rotational torque T of the hydraulic motor 12a is calculated from Δp,
Enter c. The control terminal of the comparative flow control valve 38b includes:
The second input unit 38j is connected, and the rotation speed of the hydraulic motor 12a is input from the input unit 38j.

The drilling device constructed as described above contracts the cylinder 16 until the manhole A is removed and repaired, as shown in FIG.
0 to extend the guide support 14 to the guide frame 26.
It is conveyed so as to be in a horizontal state substantially parallel to. When arriving at the construction site, first, as shown in FIG. 1, a bit cover 50 is installed on the outer periphery of the manhole A to be constructed. The bit cover 50 includes an annular ring plate 50a having an inner peripheral diameter larger than the diameter of the outer cylindrical portion 10c of the cylindrical cutting bit 10, and a pair of inner and outer peripheral edges fixed to the ring plate 50a. Outer wall 5
0b and 50c, and the longitudinal section is formed in a substantially U-shape.

At the lower ends of the inner and outer peripheral wall portions 50b and 50c,
Packing material 50 made of a flexible sponge or the like that deforms according to the surface shape of pavement plate B on which cover 50 is installed.
d is fixed over the entire circumference. Inner wall 50
In b, a large number of pores 50e are provided penetrating in the radial direction. A suction hole 50f connected to the vacuum unit 40 mounted on the vehicle 32 by a hose or the like is provided at an appropriate position on the outer peripheral wall 50c.

At the upper end on the inner peripheral side of the ring plate 50a,
Cylindrical cutting bit 1 inserted inside ring plate 50a
A flexible sealing material 50g that slides along the outer circumference of the outer cylinder portion 10b is fixed. In the bit cover 50 thus configured, the space 50h defined by the roadbed surface B, the ring plate 50a, and the inner and outer peripheral walls 50b and 50c is depressurized by the vacuum unit 40, so that water is injected into the cylindrical cutting bit 10. Water and cutting powder supplied from the vessel 30 are taken in through the fine holes 50e to prevent them from scattering.

Since the bit cover 50 is formed in an annular shape, the bit cover 50 is also used as a guide for positioning the cylindrical cutting bit 10 on the outer periphery of the manhole A for centering. When the bit cover 50 is set at a predetermined position with respect to the center of the manhole A, the vehicle 32 is moved backward and stopped at a position where the center axis of the vehicle 32 and the center of the bit cover 50 substantially match.

Next, the horizontal cylinder 28 is extended, the frame 24 is positioned substantially at the rear end side of the guide frame 26, and the swing cylinder 20 is contracted to guide the guide post 1
4 is made almost upright (see FIG. 10). Then, in this state, the vehicle 32 is moved so that the center of the cutting bit 10 and the center of the bit cover 50 match. When this operation is completed, the outriggers 42 are extended to the roadbed surface B and landed, and the carrier 34 is fixed at a horizontal level.

Next, the revolving cylinder 22 is driven to more precisely align the center of the cutting bit 10 with the center of the bit cover 50 (see FIG. 11).
And the tip of the cutting bit 10 is
It is lowered so that it is located near the upper end of 0, and the matching state of the centers is confirmed. When such centering work is completed,
The cutting of the roadbed surface B is started.

At the start of cutting, the vacuum unit 40 is driven to reduce the pressure in the space 50h of the bit cover 50, water is supplied from the water tank 36 to the water injector 30 via a pump or the like, and the hydraulic control unit 38
Is initialized. The initial setting includes setting of the rotation speed N of the hydraulic motor 12a from the second input unit 38j and the bit cutting amount H of the cutting bit 10 from the first input unit 38d (in the example shown in FIG. The length of the bit 10d provided at the tip of 10b reaches the ground C below the pavement plate B), the bit descending speed V ₀ , the bit ascending speed, and the set torque value T ₀ of the hydraulic motor 12a.

FIG. 12 shows an example of the control performed by the hydraulic control unit 38 when the initialization is performed as described above. The rotation speed of the cutting bit 10
The rotation speed of the hydraulic motor 12a is initially set from the second input unit 38j, and the comparison flow control valve 38b controls the rotation speed of the hydraulic motor 12a so as to reach the set rotation speed N. The number increases with time and is maintained at the set value N (see FIG. 12A).

On the other hand, the lowering speed of the cutting bit 10 gradually increases, and is maintained at the set lowering speed V ₀ . In this case, when the cutting of the roadbed surface B by the cutting bit 10 is started, the torque T of the hydraulic motor 12a gradually increases, and the value is constantly input to the comparator 38c via the calculating means 38e. In the comparator 38c, the set torque value T
_If the current torque value T is smaller than ₀ ,
Without sending a signal to the high-speed response control valve 38a, to maintain the lowering speed V ₀ that is set.

On the other hand, the comparator 38c is, for example, is not mixed hard foreign matter cutting pavement B, and greater than the torque value T ₀ of the torque value T is set, a signal at a high speed response control valve 38a sending to, the lowering speed V ₀ that is set controlled to be low. The state of such control is shown in FIG.
2 (B) and 2 (C). In this case, when the torque value T becomes extremely large due to breakage of the bit, the lowering and rotation of the cutting bit 10 are stopped.

When the cutting bit 10 is lowered by an amount corresponding to the set bit cutting amount H, the hydraulic motor 12a is stopped, and the cutting bit 10 is raised by contraction of the cylinder 16. In order to control the bit cutting amount, a stroke sensor may be provided in the cylinder 16, for example. As described above, when the inner peripheral groove D and the outer peripheral groove E having different diameters are formed on the outer periphery of the manhole A by the punching device, FIG.
As shown in the figure, a ring-shaped pavement plate portion F having an inner peripheral edge attached to a manhole A, and a second ring-shaped pavement plate portion G having an inner and outer peripheral edge separated by an inner peripheral groove D and an outer peripheral groove E are provided. . When such ring-shaped paving slabs F and G are formed, next,
The ring-shaped pavement slab F is crushed and removed.

FIG. 3 shows the state of the crushing and removal.
In crushing and removing the ring-shaped pavement plate portion F, first, the wedge-shaped member 60 is driven into the inner peripheral groove D. The reason why the wedge-shaped member 60 is driven into the inner peripheral groove D is that, when the wedge-shaped member 60 is driven into the outer peripheral groove E, the outer peripheral wall side of the outer peripheral groove E collapses and the appearance is impaired when the repair is completed. The wedge-shaped member 60 must be driven into the groove D.

FIG. 4 shows an example of the wedge-shaped member 60 used at this time. The wedge-shaped member 60 shown in the figure includes a substrate 60a to be driven into the groove D, a wedge piece 60c swingably supported at the lower end side of the substrate 60a by a pin 60b,
0a. The wedge piece 60c has a downwardly inclined surface formed on the upper end side. When the substrate 60a is driven into the groove D, the wedge piece 60c is pushed by the side wall of the groove D and fits within the thickness of the substrate 60a. I have.

When the substrate 60a is driven into the groove D and the piston rod 60d is pushed down,
The wedge piece 60c protrudes outward from the surface of the substrate 60a, and the protruding portion cuts into the inner peripheral wall of the inner peripheral groove D. Such a wedge-shaped member 60 is driven into the inner peripheral groove D at, for example, four locations at equal angular intervals as shown in FIG.

When the driving of the wedge-shaped member 60 is completed, the wire is locked on the upper end of the substrate 60a, the collecting ring 70 is interposed on the upper end side of the wire, the wire is pulled up, and the ring-shaped pavement plate portion F is crushed and removed. Is performed. At this time, the wire can be pulled up by removing the cylindrical bit 10 of the drilling device from the drilling machine 12 and using the cylinder 16.

When the crushing and removal of the ring-shaped pavement plate portion F is completed, the second ring-shaped pavement plate portion G on the outer peripheral side thereof is crushed and removed. The second ring-shaped pavement slab G can be easily crushed and removed by, for example, driving the tip of a breaker between the pavement slab and the ground C from the inside thereof since the ring-shaped pavement slab F has already been removed. Can be done. When the second ring-shaped pavement slab G is removed, as shown in FIG. 5, the manhole A is removed, and the cover A ₁ ′ of the new manhole A ′ and the frame A ₂ ′ are installed. When a new ring-shaped pavement slab H is constructed on the outer periphery of the manhole A ', the removal and repair work is completed.

Now, according to the removal and repair method carried out in the above-described manner, the double grooves D,
After forming E, the wedge-shaped member 60 is driven into the groove D on the inner peripheral side to crush and remove the ring-shaped pavement plate portion F, and then crush and remove the second ring-shaped pavement plate portion G. Compared to the case of crushing and removing, the generation of noise and vibration is reduced, and the newly constructed ring-shaped pavement slab H can be sufficiently compacted.

Further, in the case of the present embodiment, since the wedge-shaped member 60 is driven into the inner peripheral side of the double cut grooves D and E, the outer peripheral wall of the outer peripheral cut groove E is not damaged. Therefore, the beauty of the boundary between the newly constructed ring-shaped pavement slab H and the existing part is not impaired. Further, when the drilling device having the above configuration is used, the cutting bit 10
Alignment work with manhole A becomes easier,
Setup up to centering can be done easily. In this case, the use of the annular bit cover 50 serves as a mark when the cutting bit 10 is lowered, so that the centering operation is further facilitated.

Furthermore, a high-speed response control valve 38a for controlling the moving speed of the cylinder 16 and a calculating means 38e for calculating the rotational torque of the hydraulic motor 12a are provided. When the speed is high, the moving speed of the cylinder 16 is reduced by the high-speed response control 38a. Therefore, if necessary initial settings are made, the pavement plate B can be automatically cut with a substantially constant torque.

Further, in the case of this embodiment, since the bit cover 50 for collecting and eliminating the supplied water is provided on the outer periphery of the cutting bit 10, scattering of water and cutting powder can be prevented. . FIGS. 13 to 15 show a second embodiment of the manhole removing and repairing method according to the present invention.
The same reference numerals are given and the detailed description is omitted, and only the characteristic points will be described below. In the embodiment shown in the figure, up to the step of forming double inner and outer peripheral grooves D and E on the outer periphery of the manhole A to separate the ring-shaped paving plate portion F from the second ring-shaped paving plate portion G. Is performed in the same manner as in the first embodiment.

When crushing and removing the ring-shaped pavement plate portion F, first, as shown in FIG. 13, a part of the second ring-shaped pavement plate portion G is removed. This removing means is performed using, for example, a breaker. In the example shown in FIG. 13, the pavement plate peeling portions I are provided at four opposing positions of the second ring-shaped pavement plate portion G. When the paving plate separating portion I is provided, as shown in FIG. 14, a wedge-shaped member 60 is provided from each paving plate separating portion I to the boundary between the lower surface of the ring-shaped paving plate portion F and the ground C.
a is driven. FIG. 15 shows an example of a driving method of the wedge-shaped member 60a. The wedge-shaped member 60a is bent in a substantially L-shape, and is driven by extending the jacket 72 from the back side thereof. When the driving of the wedge-shaped member 60a is completed, the wedge-shaped member 60a is shown in FIG. 3 of the first embodiment. In the same manner as in the step, the wedge-shaped member 60a is pulled up by a wire to crush and remove the ring-shaped pavement plate portion F, and the subsequent steps are performed in the same manner as in the first embodiment.

When the manhole A is removed and a new manhole A 'is installed by the above-described steps, the same operation and effect as those of the above embodiment can be obtained. 16 to 1
8 is the third manhole removal and repair method according to the present invention.
An embodiment is shown, and only the characteristic points will be described below. In the removal and repair method shown in the figure, the cutting bit 10 for forming a cutting groove on the roadbed surface B is configured as follows. The diameter of the outer cylindrical portion 10b of the cutting bit 10 is the same as that of the first and second embodiments,
the inner peripheral diameter of c is set to be slightly larger than the outer peripheral diameter of the frame A ₁ manhole A. When the inner and outer peripheral grooves D and E are formed on the roadbed surface B using the cutting bit 10 having such a configuration, the inner peripheral groove D is formed on the frame A ₁ of the manhole A as shown in FIG. It is formed in a state adjacent to the outer peripheral edge.

[0058] In this case, alignment of the cutting bit 10 relative to the manhole A is also possible to use a bit cover 50 as in the above embodiment, for example, remove the lid A ₁ manhole A, the frame A ₂ The cutting bit 10 can be positioned using the formed circular hole. When the inner peripheral groove D is formed in the above state, the pavement plate attached to the outer peripheral edge of the manhole A can be removed in the process of forming the inner peripheral groove D. In this case, even if a part of the pavement slab remains on the outer peripheral edge of the manhole A, the remaining pavement slab may be removed by hitting with a hammer or the like.

When the inner and outer peripheral grooves D and E are formed,
A ring-shaped pavement slab F 'is formed between the grooves D and E, and then the manhole A is removed. To remove the manhole A, the lid A ₁ is removed, and a wedge-shaped member that expands and contracts by hydraulic pressure or pneumatic pressure is driven into the frame A ₂ from the inside of the frame A ₂ at the boundary between the cylindrical wall A ₃ and the frame A _2. It separated from the a _3, carried out in a method of removing the frame a ₂ (Fig. 1
8).

When the manhole A is removed in this way, the ring-shaped pavement slab F 'is crushed and removed. This crushing and removal is performed by driving a wedge-shaped member between the ring-shaped pavement slab F ′ and the ground C from the inner peripheral edge side, and by employing such a crushing and removing method, the outer wall of the outer peripheral groove E is removed. The ring-shaped pavement slab F ′ is removed without damaging the side, and the deformation of the outer peripheral shape of the ring-shaped pavement slab newly performed can be prevented. And
When the crushing and removal of the ring-shaped pavement slab F 'is completed, the same steps as in the above embodiment are performed thereafter.

FIG. 19 shows a fourth embodiment of the manhole removing and repairing method according to the present invention, and only the following features will be described. In the embodiment shown in FIG.
An auxiliary bit 100 is provided on the inner peripheral surface of the inner cylindrical portion 10c of the cutting bit 10 described in the embodiment.
0 is used to form grooves D and E. Auxiliary bit 100
Are provided so as to project diagonally downward and inward from the inner peripheral surface of the inner cylindrical portion 10c, and a plurality of are provided at intervals in the circumferential direction. By using such a cutting bit 10, when forming the inner peripheral groove D, the pavement plate portion adhering to the outer peripheral edge of the manhole A can be more reliably removed, and for example, as shown in FIG. As shown, frame A
Also in the case of a manhole structure in which a step is provided on the upper surface side of _1, the pavement plate attached to the upper side of the manhole A can be removed.

In the case of a manhole provided with such a step, the position of the auxiliary bit 100 is set in consideration of the width and depth of the step. In the above embodiment, the apparatus for forming the double cutting grooves D and E is shown in FIGS.
Although the perforating apparatus shown in FIG. 2 is exemplified, the embodiment of the present invention is not limited to this, and other perforating apparatuses can be used.

[0063]

As described above in detail in the embodiments,
ADVANTAGE OF THE INVENTION According to the manhole removal and repair method according to the present invention, the generation of noise and vibration can be suppressed as much as possible, and the pavement slab to be newly constructed can be sufficiently compacted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a part of the steps of a first embodiment of the removal and repair method according to the present invention and an enlarged cross-sectional view of a main part.

FIG. 2 is a cross-sectional view and a plan view of a step performed after FIG. 1;

FIG. 3 is a cross-sectional view and a plan view of a step performed after FIG. 2;

FIG. 4 is a front view and a sectional view of a wedge-shaped member used in the step shown in FIG.

FIG. 5 is a sectional view of a step performed subsequent to FIG. 3;

FIG. 6 is a side view showing an example of a punching device used in the method according to the present invention.

FIG. 7 is a detailed view of a cylindrical cutting bit used in the method according to the present invention.

FIG. 8 is a sectional view of a drilling machine of the drilling device shown in FIG. 6;

9 is a hydraulic system diagram showing a part of a hydraulic control unit of the drilling device shown in FIG.

FIG. 10 is a side view of the drilling device shown in FIG.

FIG. 11 is an explanatory view when centering by rotating the turning stage in the state of FIG. 5;

FIG. 12 is a graph showing a change over time of a rotation speed, a descent speed, and a rotation torque when a bit is controlled by the hydraulic control unit shown in FIG. 9;

FIG. 13 is a sectional view and a plan view showing a part of the steps of a second embodiment of the removal and repair method according to the present invention.

14A and 14B are a cross-sectional view and a plan view of a step performed after FIG.

FIG. 15 is an explanatory diagram of a method of installing a wedge-shaped member used in the step of FIG.

FIG. 16 is an explanatory sectional view of a step in a third embodiment of the removal and repair method according to the present invention.

FIG. 17 is an explanatory cross-sectional view of a step performed after FIG. 16;

18 is an explanatory cross-sectional view of a step performed subsequent to FIG. 17;

FIG. 19 is a cross-sectional view showing main steps of a fourth embodiment of the removal and repair method according to the present invention.

[Explanation of symbols]

A manhole A ₁ lid A ₂ frame A 'new manhole B pavement C Ground D within the peripheral groove E circumferential groove F ring pavement section G second ring-shaped pavement section H new pavement section I peeling unit

Continuation of front page (56) References JP-A-7-247565 (JP, A) JP-A-6-57774 (JP, A) JP-A-5-179606 (JP, A)

Claims (6)

(57) [Claims] When removing a circular manhole embedded in a paving slab, a substantially concentric cutting groove is formed on the outer periphery of the manhole, an inner peripheral edge is attached to the manhole, and an outer peripheral edge is formed by the cutting groove. By separating the ring-shaped pavement plate portion separated from the pavement plate, and after removing the ring-shaped pavement plate portion and the manhole, a new manhole is installed in the removed portion, and a new ring shape is provided on the outer periphery thereof. In the method of removing and repairing a manhole for constructing a paving slab portion, when forming the cutting groove, a double cutting groove having a different diameter is formed on the outer periphery of the manhole to position the ring-shaped paving slab portion and the outside thereof. second and a ring-shaped pavement section and隔成, the ring-shaped pavement section disrupted removed by lifting it by implanting wedges in the cut groove on the inner peripheral side, and thereafter, the ring-shaped pavement to Removal renovation method manhole, characterized in that the removal of the second ring-shaped pavement portion of the outer peripheral side of the crushing. 2. When removing a circular manhole embedded in a paving slab, a substantially concentric cutting groove is formed on the outer periphery of the manhole, an inner peripheral edge is attached to the manhole, and an outer peripheral edge is the cutting groove. After separating the ring-shaped pavement plate portion from the pavement plate and removing the ring-shaped pavement plate portion and the manhole, a new manhole is installed on the removed portion, and the outer periphery thereof is mounted. In the manhole removal and rehabilitation method of constructing a new ring-shaped pavement slab, when forming the cut groove, the ring-shaped pavement slab is formed by forming double cut grooves having different diameters on the outer periphery of the manhole. And a second ring-shaped pavement slab located outside thereof and a part of the second ring-shaped pavement slab on the outer peripheral side of the ring-shaped pavement slab is peeled off. Wedge between pavement slab and ground Removing and repairing the ring-shaped pavement slab and then crushing and removing the remaining portion of the second ring-shaped pavement slab. 3. The double cutting groove is formed by a double cylindrical cutting bit, and when forming the cutting groove with the cutting bit, water injected into the outer periphery of the cutting bit is collected and eliminated. 3. The method according to claim 1, wherein an annular bit cover is provided. 4. When removing a circular manhole buried in a paving slab, a substantially concentric cutting groove is formed on the outer periphery of the manhole, and the ring-shaped pavement plate portion separated by the cutting groove and the manhole. After removing the above, a new manhole is installed in the removed part, and a new ring-shaped pavement slab is constructed around the outer periphery of the manhole. An inner circumferential groove adjacent to a peripheral edge and an outer circumferential groove formed at a predetermined distance from the inner circumferential groove, and after removing the manhole, crushing and removing the ring-shaped pavement plate portion; Removal renovation method. 5. The crushing and removing of the ring-shaped pavement slab is performed by driving a wedge-shaped member between the ring-shaped pavement slab and the ground from the inner peripheral side thereof. Removal method of manhole. Wherein said inner and outer grooves are formed by a double cylindrical cutting bit, characterized in that the auxiliary bit protruding digits set inwardly on the inner peripheral surface of the inner cylindrical portion of the cutting bit 7. The method for removing and repairing manholes according to claim 5 or 6.