JPWO2006046324A1 - Buried material laying method - Google Patents

Abstract

The present invention generally satisfies workability, safety, and environmental performance by performing minimal excavation for renewal and new construction of buried objects such as lead-in pipes. A buried laying method for renewing or newly burying a buried object, in order to form a pavement plate piece separated from the surroundings, a roadbed under the pavement plate from the surface of the pavement plate laid on the ground To the predetermined area where the paving plate piece is removed, cutting the outer periphery of the predetermined area set in the paving plate, removing the cut paving plate piece from the paving plate, and Prior to lowering the casing to the ground, the suction excavation step of constructing a vertical hole by suction excavating the ground exposed to the inner bottom of the casing while confirming the presence or absence of the buried object, and When the ground is suctioned to the target depth, a non-open cutting laying process that updates or newly installs a buried object using a non-cutting method, and a backfilling process that backfills the vertical holes while pulling up the casing, A. [Selection] Figure 2

Description

  The present invention relates to a buried construction method for renewing or newly installing a buried object such as a lead-in pipe, and more particularly to a new construction method called “MDP” (Minimum Digging Process).

  Conventionally, lead pipes have been frequently used as water pipes (water supply pipes) for drawing water into residential land from the viewpoint of workability and economy. However, since lead itself is an accumulative poison, if the lead elutes for some reason, tap water may be contaminated. Therefore, in recent years, with the revision and enforcement of water supply standards, the existing lead pipes buried underground are replaced with other highly safe pipe materials (for example, polyethylene pipes, hard polyvinyl chloride pipes, stainless steel pipes, etc.). There is a need.

For example, Patent Document 1 discloses a service pipe arrangement method for piping a branch pipe from an underground buried pipe such as a gas pipe, a water pipe, a sewage pipe, and drawing it into a building along a road. . Specifically, first, a part of the paved road surface is cut with a circular cutter, and a lifting tool is inserted into the center thereof. A diameter expanding member is attached to the tip of the lifting tool, and the lifting tool is bitten into the pavement slab by expanding the diameter expanding member. Then, the cut pavement slab is removed by lifting the lifting tool with a crane. Next, the inside of the casing is excavated with a machine while the casing installed in the removed region is press-fitted with a hydraulic machine. Then, when excavating to the vicinity of the buried water pipe, stop the machine excavation and excavate while checking the water pipe manually. After that, when the lead-in pipe work is completed, the excavated earth and sand are refilled in the casing. At that time, the cement-based consolidated material is put into the hole in a state of being backfilled by about half, and after being mixed with the backfill soil with a squeezing tool, the backfill soil is rolled. Thereafter, the casing is pulled up and removed, and the remaining backfill is performed. Finally, after reshaping the roadbed, paving with quick setting concrete.
JP 2000-45675 A

  By the way, in recent years, in civil engineering work, not only the efficiency of work but also consideration for the environment, safety and durability has become important. Items that should be considered in terms of environmental properties include the treatment of residual soil generated by work or the handling of dust and sewage due to cutting of paved roads and excavation of roadbeds. From this point of view, it is also important to reduce the work scale (for example, to reduce the removal area of the paving slab laid on the ground), and if the work area on public roads is large, it may cause traffic congestion. .

  As a matter to be considered in terms of safety, it is necessary to avoid damaging or destroying underground buried objects that are not grasped by the operator during excavation. In addition, as a matter to be considered in terms of durability, the repaired pavement plate maintains flatness for a long period of time, and it is difficult to cause depression of the road surface.

  The present invention has been made in view of such circumstances, and its purpose is to perform overall excavation, safety, and environmental performance by performing minimal excavation with respect to renewal and new construction of buried objects such as lead-in pipes. It is to provide a new method for laying buried objects that is satisfying.

  In order to solve this problem, the present invention is configured as follows.

The invention according to claim 1 is a buried object laying method for performing renewal or new construction of a buried object,
In order to form a paving plate piece separated from the surroundings, from the surface of the paving plate laid on the ground to the roadbed under the paving plate, the outer periphery of a predetermined area set in the paving plate is cut, A pavement plate cutting and removing step for removing the cut pavement plate piece from the pavement plate, a casing is disposed in a predetermined area where the pavement plate piece is removed, and prior to lowering the casing to the ground, A suction excavation process for constructing a vertical hole by suction excavation of the ground exposed on the inner bottom of the casing while confirming the appearance, and a buried object using a non-open cutting method when the ground is suction excavated to a target depth A non-cutting laying process in which renewal or new installation is performed, and a backfilling process in which the vertical hole is backfilled while pulling up the casing. Regarding the renewal and new construction of buried objects, the workability, safety and environmental performance can be satisfied as a whole by removing the pavement plate pieces from the pavement plate and performing the minimum suction excavation.

  The invention described in claim 2 is a method for laying a buried object in which the buried object is renewed or newly installed, and a casing is arranged in a predetermined area, and before the casing is lowered to the ground, the presence or absence of the buried object is checked. A suction excavation process for constructing a vertical hole by suction excavating the ground exposed on the inner bottom of the casing while checking, and when excavating the ground to a target depth, renewing or newly installing the buried object using a non-cutting method A non-open cutting laying step, and a backfilling step of backfilling the vertical hole while pulling up the casing. With regard to renewal and new construction of buried objects, workability, safety and environmental performance can be satisfied as a whole by performing minimal excavation even in places where there are no paving plates.

  The invention according to claim 3 includes a restoration step of ensuring a predetermined flatness by eliminating a step from the periphery after the backfilling. Steps are eliminated so as not to interfere with traffic such as driving of automobiles, bicycles, pedestrian traffic, and predetermined flatness is ensured.

  The invention according to claim 4 is a method for forming a paving plate piece having a tapered side surface that has a transverse area that decreases in the depth direction in the paving plate cutting and removing step and separated from the surroundings. The cutting step of cutting the outer periphery of a predetermined area set in the paving plate from the surface of the paving plate laid on the ground to the roadbed under the paving plate, and attached to the fulcrum so that it can be opened and closed A holding step of lowering a clamp having a plurality of clamp arms and fitting the plurality of clamp arms into a cutting groove formed by the cutter from above, and the plurality of clamp arms having a taper of the paving plate piece. A removing step of removing the paving plate piece from the paving plate by raising the clamp while maintaining a state of sandwiching the side surface. The pavement plate piece is removed by raising the clamp holding the pavement plate piece, and this pavement plate piece is pinched by having a tapered side surface that reduces the cross-sectional area in the depth direction. It is possible to effectively prevent the pavement plate piece from falling off. As a result, the partial removal of the pavement plate can be accurately performed with a simple operation.

  According to a fifth aspect of the present invention, in the removing step, the plurality of clamps are caused by displacement of the plurality of clamp arms in the closing direction caused by the weight of the paved plate piece when the clamps are raised. The tip of the arm is engaged with the tapered side surface of the paving plate piece. Using the frictional force generated between the tips of the plurality of clamp arms and the tapered side surface of the paving plate piece, the engagement force required for the clamp to hold the paving plate piece can be obtained easily and reliably.

  According to a sixth aspect of the present invention, in the removing step, the plurality of clamp arms are displaced in the closing direction by hydraulic pressure to engage the tips of the plurality of clamps with the tapered side surfaces of the paving plate piece. . The plurality of clamp arms can be displaced in the closing direction by hydraulic pressure, and the tips of the plurality of clamps can be reliably engaged with the tapered side surfaces of the paving plate piece.

  In the invention according to claim 7, in the pavement plate cutting and removing step, in order to form a pavement plate piece separated from the surroundings, the surface of the pavement plate laid on the ground reaches the roadbed below the pavement plate. Until the cutting step of cutting the outer periphery of the predetermined area set in the pavement plate with a cutter, the holding step of inserting a bar-shaped lifting tool into the cut pavement plate piece from above at a first insertion angle, By displacing the lifting tool inserted through the paving plate piece to a second insertion angle different from the first insertion angle, the lifting tool is brought into pressure contact with the paving plate piece and the second insertion angle. And removing the paving plate piece from the paving plate by raising the lifting tool while maintaining the condition. A bar-shaped lifting tool is inserted into the cut paving plate piece from above at the first insertion angle, and the lifting tool is displaced to a second insertion angle different from the first insertion angle, thereby removing the lifting tool from the paving plate. By lifting the lifting tool while maintaining pressure contact with the piece and maintaining the second insertion angle, partial removal of the pavement plate can be accurately performed with a simple operation.

  The invention according to claim 8, wherein in the pavement plate cutting and removing step, in order to form a pavement plate piece separated from the surroundings, the surface of the pavement plate laid on the ground reaches the roadbed immediately below the pavement plate. Until the cutting step of cutting the outer periphery of the predetermined area set in the paving plate with a cutter, the clamp having a plurality of clamp arms whose tips can be bent, and the tips of the plurality of clamp arms extended The holding step of fitting the plurality of clamp arms into the cutting grooves formed by the cutter from above, and changing the plurality of clamp arms from a stretched state to a bent state by changing the tips of the plurality of clamp arms. The pavement plate piece is removed from the pavement plate by engaging the tip of the arm with the side surface of the pavement plate piece and then raising the clamp. Removing step. With multiple clamp arms extended, insert multiple clamp arms into the cutting groove from above and change the multiple clamp arms from extended to bent. By engaging the side surface of the pavement plate piece and raising the clamp, it is possible to accurately remove the pavement plate by a simple operation.

  In the invention according to claim 9, in the paving plate cutting and removing step, in order to form a paving plate piece separated from the surroundings, the surface of the paving plate laid on the ground reaches the roadbed below the paving plate. Until the cutting step of cutting the outer periphery of the predetermined area set in the paving plate with a cutter, and a clamp having a plurality of clamp arms attached to the fulcrum so as to be opened and closed at a first insertion angle A holding step of fitting the plurality of clamp arms into the cutting groove formed by the cutter from above, and a second insertion different from the first insertion angle of the plurality of clamp arms fitted into the cutting groove. By displacing to the angle, the front ends of the plurality of clamp arms are brought into pressure contact with the side surface of the pavement plate piece and the second insertion angle is maintained while By raising the clamp, having a removal step of removing the pavement pieces from the pavement. Paving the tips of multiple clamp arms by fitting multiple clamp arms into the cutting groove from above and displacing multiple clamp arms fitted into the cutting groove to a second insertion angle different from the first insertion angle By partially pressing the side of the plate piece and raising the clamp while maintaining the second insertion angle, partial removal of the paving plate can be accurately performed with a simple operation.

  In the invention according to claim 10, in the pavement plate cutting and removing step, in order to form a pavement plate piece separated from the surroundings, the surface of the pavement plate laid on the ground reaches the roadbed below the pavement plate. The cutting step of cutting the outer periphery of the predetermined area set in the paving plate with a cutter, the holding step of arranging the suction port of the suction machine on the surface of the paving plate piece, and the paving plate piece by the suction machine Removing the paving plate piece from the paving plate by raising the suction machine while sucking. By raising the suction machine while sucking the paving plate piece with the suction machine, the partial removal of the paving board can be accurately performed with a simple operation.

  In the invention according to claim 11, in the pavement plate cutting and removing step, in order to form a pavement plate piece separated from the surroundings, the surface of the pavement plate laid on the ground reaches the roadbed below the pavement plate. Until the cutting step of cutting the outer periphery of the predetermined region set in the paving plate with a cutter, the holding step of bonding the fixture to the surface of the paving plate piece, and raising the wire attached to the fixture And a removing step of removing the paving plate piece from the paving plate. By attaching the fixture to the surface of the paving plate piece and raising the wire attached to the fixture, the partial removal of the paving plate can be accurately performed with a simple operation.

  In the invention according to claim 12, the cutting step includes a step of performing suction using a wet cutter as the cutter and simultaneously sucking sewage produced by the cutting with a pump. It removes sewage generated by cutting and excels in workability and environmental performance.

  In the suction excavation process, the step of arranging the casing in a predetermined region on the surface of the ground and the presence or absence of an embedded object is confirmed before the casing is lowered to the ground. However, a suction excavation step for suction excavation of the ground exposed on the inner bottom of the casing, and a descent that lowers the casing to the ground following the suction excavation when no buried object appears by the suction excavation Steps. While confirming the presence or absence of the buried object, if the ground exposed on the inner bottom of the casing is suction excavated and no buried object appears by suction excavation, the casing is lowered to the ground following the suction excavation. Even if an unexpected buried object is buried in the ground, the damage and destruction can be avoided in advance.

  The invention according to claim 14 repeats a series of steps from the suction excavation step to the descent step until the target depth in the ground is reached. Even if an unexpected buried object is buried in the ground until the target depth in the ground is reached, the damage and destruction can be avoided in advance.

  The invention according to claim 15 is a step in which the lowering step lowers the casing by its own weight when excavating a portion directly below the peripheral portion of the casing by suction excavation. It is a simple structure in which the casing is lowered by its own weight.

  The invention according to claim 16 is a step in which the lowering step press-fits the casing into the ground using an oil pressure for lowering the casing. The casing can be quickly and reliably lowered by the oil pressure.

  According to the seventeenth aspect of the present invention, in the non-opening laying step, construction is performed by a pulling method when the buried object is renewed, and construction is performed by a propulsion method when the buried object is newly installed. The excavation area and soil volume can be greatly reduced by renewing buried objects and performing construction of new buried objects without excavation.

  In the invention according to claim 18, in the backfilling step, the vertical hole is backfilled by compaction using the improved soil obtained by adding the improvement material to the excavated soil. The vertical hole can be backfilled by compacting with improved soil, so that settlement after construction can be prevented.

  The invention according to claim 19 is the storage step after the step of storing the paving plate piece removed from the paving plate in the backfilling step and the predetermined work for the predetermined area is completed. A refit step of fitting the pavement plate piece back into the predetermined area. Backfilling can be performed at low cost by fitting the stored paving plate pieces back into the predetermined area.

  In the invention according to claim 20, the predetermined region has a circular shape with a diameter of approximately 900 mm. The predetermined area is a small circular area having a diameter of about 900 mm, and the workability of suction excavation is good.

Hereinafter, although the embodiment of the buried article laying method of the present invention will be described, the present invention is not limited to this embodiment. The embodiment of the present invention shows the most preferable mode of the invention. The applicant named the `` MDP Method '' (Minimum Digging Process) the method for laying the buried object of the present invention developed by himself, and will implement it widely in the future as a method that is excellent in workability, environment and safety.・ It is planned to expand.
(Embodiment of the first invention)
FIG. 1 is an explanatory diagram of the buried pipe laying method of the first invention.

  The ground on which a paving slab 1 (road) such as asphalt is laid on the ground is composed of an upper-layer roadbed 2, a lower-layer roadbed 3, and a roadbed 4 in order from the upper layer. The upper layer roadbed 2 and the lower layer roadbed 3 are provided immediately below the area where the pavement plate 1 is present. The upper layer roadbed 2 is a layer in which crushed stones of, for example, 30 mm or less are spread, and the lower layer roadbed 3 is a layer in which, for example, crushed stones of 40 mm or less are spread. A work object 5 that is a buried object to be worked is buried in the road bed 4 at a known target depth Dtgt. In this embodiment, the work object 5 is assumed to be a water pipe buried under a road, more specifically, a connection portion between this and a service pipe for drawing water into a residential land or site. However, the buried object of the work object 5 is not limited to this, and includes a gas pipe, a sewer pipe, an electric or telephone buried pipe, and the like. The series of work consists of removing the pavement plate (Step 1), excavating the vertical hole (Step 2), processing the work object (Step 3), backfilling the vertical hole (Step 4), and repairing the pavement plate (Step 5). It is advanced in the order.

  The buried pipe laying method (MDP method) according to the first invention can be applied not only to the renewal of buried objects but also to the new construction. FIG. 2 is a diagram showing a construction procedure of a buried pipe laying method for updating or newly constructing a buried object.

  The buried pipe laying method for renewing or newly installing this buried object is as follows: preparation (step a1), pavement plate cutting (step a2), excavation pavement plate processing (step a3), suction excavation (step a4), burial Check the position and depth (step a5), determine whether the pipeline is newly installed or update the existing pipeline (step a6). If the pipeline is newly installed, install the new pipeline (step a7). Road update (step a8), backfilling (step a9), judgment of whether temporary restoration is necessary (step a10), if temporary restoration is not necessary this restoration work (step a11), if temporary restoration is necessary After the temporary restoration work (step a12), this restoration work is performed. By removing the pavement plate piece from the pavement plate and performing the minimum suction excavation, workability, safety and environmental performance can be satisfied as a whole.

  Next, the construction of this buried pipe laying method will be described in detail.

[Removal of paving plate (Step 1)]
The pavement plate removal (step 1) is a pavement plate cutting / removing step, in which a preparatory work (step a1), a pavement plate cutting work (step a2), and an excavation pavement plate processing work (step a3) are performed.

  In the preparatory work (step a1), a construction plan based on a sufficient investigation is performed so as to satisfy the design conditions at the time of construction, and preparations are made so as not to hinder the implementation process.

  In the pavement plate cutting work (step a2) and the excavation pavement plate processing work (step a3), the pavement plate 1 serving as a work area is partially removed. Although details will be described later, the outer periphery of a predetermined region is cut with a cutter to a depth reaching the upper layer roadbed 2, and the paving plate piece 7 (see FIG. 2) separated from the surroundings is removed using a clamp that can be raised and lowered. The paving plate piece 7 removed from the paving plate 1 is stored and stored in a predetermined processing bag.

Next, in order to form a paving plate piece separated from the surroundings, the outer periphery of a predetermined area set in the paving plate is cut from the surface of the paving plate laid on the ground to the roadbed under the paving plate. The paving plate cutting and removing step for removing the cut paving plate piece from the paving plate will be described in detail. This paving plate cutting and removing step includes a step of cutting the paving plate 1, a step of setting a clamp in the cut region of the paving plate 1, and a step of removing the cut region of the paving plate 1.
(First embodiment)
FIG. 3 is an explanatory diagram of the paving plate cutting and removing process of the paving plate 1 according to the first embodiment. First, as shown in FIG. 3 (a), the fixed shaft of the circular cutter 8 is attached to the center O of the work area S set on the surface of the pavement plate 1. The work area S is located immediately above the work object 5 whose embedment location is known, and corresponds to a formation area of the paving plate piece 7 separated from the surroundings, as will be described later. In the MDP method, the work area S is defined as a circular shape having a relatively small diameter of approximately 900 mm in order to reduce the work area. The work area S for cutting the pavement plate 1 is sufficiently large enough for one worker to enter because the work on the work object 5 is performed without cutting. The operator attaches the fixed shaft of the circular cutter 8 to the center O, and cuts the outer periphery of the working area S with the circular cutter 8 as shown in FIG.

  The circular cutter 8 uses a wet cutter that cuts while cooling the diamond blade with water from the viewpoint of suppressing the release of dust generated during cutting. In this case, due to environmental considerations, sewage generated by the cutting is sucked by a pump (for example, a vacuum pump or a pressure feed pump) not shown at the same time as cutting by the wet cutter. This prevents inflow of sewage into the sewer due to cutting of the paving slab, prevents clogging of the sewage ditches and sewer pipes due to sludge, and prevents occurrence of trouble at the sewer final treatment plant.

  When cutting the pavement plate 1, the cutting edge of the circular cutter 8 is made to enter obliquely with respect to the surface of the pavement plate 1. As a result, as shown in FIG. 3 (c), the side surface of the pavement plate piece 7 has a taper that reduces the diameter in the depth direction, in other words, the cross-sectional area of the pavement plate piece 7 in the depth direction. A taper is formed such that becomes smaller.

  The tapered side surface can be easily formed by devising the shape of the circular cutter 8. FIG. 4 is a configuration diagram of a circular cutter 8 as an example. This circular cutter 8 having a diameter φ of approximately 400 mm has a dish shape with a blade tip side inclined rather than a simple flat shape. In other words, the plane is perpendicular to the central axis X up to a radius of about 39 mm, but from here onwards, the plane is bent and extended at a predetermined inclination angle θ (for example, 10 degrees) with respect to the vertical plane. A cutter blade 8 a is provided on the outer periphery of the circular cutter 8. Thus, when using the circular cutter 8 bent in a substantially dish shape, even if the rotation axis of the circular cutter 8 is arranged parallel to the surface of the pavement plate 1, the incident angle of the cutter blade 8 with respect to the surface of the pavement plate 1 is is maintained at θ. Therefore, a taper inclined at the taper angle θ is formed on the side surface of the paving plate piece 7 along with the cutting. Even when a general flat circular cutter 8 is used instead of such a special circular cutter 8, a similar taper can be formed. In this case, for example, the rotation angle of the circular cutter 8 may be inclined with respect to the surface of the pavement plate 1 so that the incident angle of the cutter blade 8a becomes θ.

  FIG. 5 is a cross-sectional view of the paving plate cutting and removing step of the paving plate 1 according to this embodiment. The operator attaches the fixed axis of the circular cutter 8 to the center O shown in FIG. 3 and arranges the circular cutter 8 so that the central axis X is parallel to the surface of the paving plate 1. Next, the operator lowers the circular cutter 8 rotating in one direction. As a result, the cutter blade 8a is incident obliquely on the surface of the pavement plate 1 and cuts the pavement plate 1 obliquely with respect to the depth direction. While displacing the circular cutter 8 along the outer periphery of the work area S, the operator cuts the outer periphery of the work area S until the cutter blade 8a reaches the upper layer roadbed 2 immediately below the pavement plate 1 (FIG. 5). (a)). As a result, as shown in FIG. 5 (b), the cutting grooves 6 that separate the pavement plate piece 7 and its periphery are formed obliquely, and the taper as described above is formed on the side surface of the pavement plate piece 7. The operator raises the circular cutter 8 after this cutting operation is completed.

  Next, the clamp 9 is fitted into the formed pavement plate piece 7. FIG. 6 is an explanatory diagram of the paving plate cutting and removing step of the paving plate 1 according to this embodiment. As shown in FIG. 6 (a), the clamp 9 has a plurality of clamp arms 9b attached to the fulcrum 9a so as to be opened and closed. Each clamp arm 9b is swingably attached to the fulcrum 9a. The tip of each clamp arm 9b is made of the same material as that of the clamp arm 9b and is provided with teeth for sandwiching the object. First, as shown in FIG. 6 (b), the operator lowers the clamp 9 and fits the plurality of clamp arms 9 b into the cutting groove 6 formed by the circular cutter 8 from above. Next, as shown in FIG. 6 (c), the operator raises the clamp 9 while maintaining a state in which the plurality of clamp arms 9b sandwich the tapered side surface of the paving plate piece 7. When the clamp 9 is raised, due to the weight of the paving plate piece 7, the tips of the plurality of clamp arms 9 b are engaged with the tapered side surfaces of the paving plate piece 7. That is, at the time of ascent, the plurality of clamp arms 9b are displaced in the closing direction, and the respective tips abut against the side surface of the paving plate piece 7 and mesh with the side taper. Since the paving plate piece 7 has a tapered side surface, the engagement force increases as the lifting force of the clamp 9 increases, and the slippage of the paving plate piece 7 is also restricted. As a result, the clamp 9 can sufficiently obtain the engagement force necessary to sandwich the paving plate piece 7, so that the paving plate piece 7 can be removed easily and accurately.

  According to the MDP method having the steps as described above, workability, environmental performance ("friendly to the global environment"), and safety can be totally satisfied.

In particular, according to the pavement plate cutting and removing process of the pavement plate 1, partial removal of the pavement plate 1 can be accurately performed with simple operations. That is, the paving plate piece 7 is removed by raising the clamp 9 holding the paving plate piece 7. Since the side surface of the pavement plate piece 7 is provided with a taper having a diameter reduced in the depth direction, dropping of the nipped pavement plate piece 7 is effectively regulated. Further, a special and complicated lifting tool for removing the paving plate piece 7 is not necessarily required, and the work can be efficiently performed by a general-purpose device having a simple configuration such as the clamp 9. In addition, the pavement plate piece 7 can be removed as one piece without being destroyed, and generation of dust and noise due to the destruction can be prevented. Furthermore, when disposing the pavement plate piece 7 as an asphalt lump together, it can be transported compactly on the road by storing it in a dedicated storage bag, which is advantageous in terms of transportation and disposal.

  In the above-described embodiment, when the clamp 9 is raised, due to the weight of the paved plate piece 7, the tips of the plurality of clamp arms 9b engage with the tapered side surface of the paved plate piece 7. However, the present invention is not limited to this, and is necessary by actively controlling the operation of the clamp arm 9b, for example, by displacing the plurality of clamp arms 9b in the closing direction by hydraulic pressure. Engaging force may be secured. In the above-described embodiment, the work area S is circular. However, the present invention is not limited to this, and may be any shape including a rectangular piece or the like. These variations are the same in the embodiments described later.

(Second embodiment)
FIG. 7 is an explanatory diagram of the paving plate cutting and removing process of the paving plate 1 according to the second embodiment. In the following description, the same members as those described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted here. First, the fixed shaft of the circular cutter 8 is attached to the center O of the work area S set on the surface of the pavement plate 1 ((a) in the figure). The operator uses the attached circular cutter 8 to cut a radius of 450 mm with respect to the center O, that is, the outer periphery of the work area S with the circular cutter. The circular cutter 8 is not a dish-shaped one as in the first embodiment, but a general flat one is used in a general usage pattern. Therefore, the side surface of the paving plate piece 7 is formed in a straight shape, and does not need to be formed in a tapered shape as in the first embodiment.

  Next, a breaker 10 which is a form of a rod-like lifting tool is inserted from above into a small hole (hereinafter referred to as “center hole”) drilled in the center O when the circular cutter 8 is attached, from above with a first insertion angle θ1. ((B) in the figure). The breaker 10 is attached to the tip of the arm of the power shovel instead of the shovel. For example, a hydraulic breaker (type E-203) manufactured by Nippon Pneumatic Industry Co., Ltd. can be used. The rod-like lifting member does not necessarily need to be a special tool with a diameter-expanding member as mentioned in the prior art, and may be a simple rod-like member having a sharp tip. However, in view of the use of lifting the paving plate piece 7, a considerable strength is required for the lifting tool. In this embodiment, a readily available general-purpose breaker 10 is used as a lifting tool that satisfies such requirements. The operator who operates the power shovel aligns the tip of the breaker 10 with the center hole, and inserts the breaker 10 while expanding the diameter. The insertion angle θ1 of the breaker 10, that is, the angle formed by the vertical direction of the pavement plate 1 and the extending direction of the breaker 10, is preferably 0 degrees or near O degrees.

  The operator operates the power shovel to displace the breaker 10 inserted through the pavement plate piece 7 to a second insertion angle θ2 different from the first insertion angle θ1 ((c) in the figure). As a result, the outer peripheral surface of the breaker 10 is strongly pressed against the inner peripheral surface of the center hole, and the breaker 10 is pressed against the work area S that is a part of the pavement plate 1. However, if the displacement amount of the second insertion angle θ2 with respect to the first insertion angle θ1 (θ2−1θ1) is too large, the pavement plate 1 in the work area S will be cracked, so the displacement amount is only a few degrees. Should. The shovel operation in this step is an operation of tilting the breaker 10 inserted from a substantially vertical direction (θ1 <θ2).

  Then, the operator raises the breaker 10 by excavator operation while maintaining the second insertion angle θ2. As a result, only the paving plate piece 7 separated from the surroundings is extracted by the frictional force generated between the breaker 10 and the periphery.

  According to this embodiment, a special lifting tool for removing the paving plate piece 7 is not necessarily required, and a simple and general-purpose bar-like member such as the breaker 10 can be used to efficiently perform the work. it can. In addition, since the pavement plate piece 7 can be removed as one piece without breaking, dust generation and noise due to breakage can be prevented. Furthermore, since the extracted pavement plate 1 can be disposed of as an asphalt lump, it is advantageous in terms of transportation and disposal.

(Third embodiment)
FIG. 8 is an explanatory diagram of the paving plate cutting and removing step of the paving plate 1 according to the third embodiment. In this embodiment, the paving plate piece 7 is removed by using the clamp 11. The clamp 11 is mainly composed of a base 11a and a plurality of clamp arms 11b. One end of each clamp arm 11b is attached to the base 11a. The other end can be bent via a fulcrum 11c, and its state is controlled by, for example, hydraulic pressure. In the open state of the clamp 11, the tip of the clamp arm 11b is in a state of extending linearly. In the open state, the tip of the clamp arm 11b is bent in a substantially L shape.

  First, the operator lowers the clamp 11 with the tips of the plurality of clamp arms 11b extended, and inserts each clamp arm 11b into the cutting groove 6 from above. Next, the operator changes the tip of the clamp arm 11b from the extended state to the bent state (open state → closed state) as indicated by an arrow in FIG. As a result, the tips of the plurality of clamp arms 11b engage with the side surfaces of the paving plate piece 7. The worker raises the clamp 11 by lifting the wire 11d while maintaining this engaged state. As a result, the paving plate piece 7 is removed from the paving plate 1.

  According to this embodiment, the removal work of the paving plate piece 7 can be easily and efficiently performed as in the above-described embodiments.

(Fourth embodiment)
FIG. 9 is an explanatory diagram of the paving plate cutting and removing process of the paving plate 1 according to the fourth embodiment. In the present embodiment, the paving plate piece 7 is removed using the clamp 12. The clamp 12 is mainly composed of a base 12a and a plurality of glamp arms 12b. One end of each clamp arm 12b is swingably attached to the base 12a via a fulcrum 12c, and its state is controlled by, for example, hydraulic pressure. In the open state of the clamp 12, the tip of the clamp arm 12b extends vertically downward. In the open state, the angle formed by the vertical line and the clamp arm 12b (in the extending direction) is θ.

  First, the operator lowers the clamp 12 with the plurality of clamp arms 11b extending vertically downward (first insertion angle), and fits each clamp arm 12b into the cutting groove 6 from above. Next, the operator displaces the plurality of clamp arms 12b fitted in the cutting grooves 6 to a second insertion angle different from the first insertion angle (that is, θ shown in the figure), and the tips of the plurality of crank arms 12b Is pressed against the side surface of the paving plate piece 7. As a result, the tip of the clamp arm 12b engages with the side surface of the paving plate piece 7. The operator lifts the wire 12d and raises the clamp 12 while maintaining this engaged state. As a result, the paving plate piece 7 is removed from the paving plate 1.

  According to this embodiment, the removal work of the paving plate piece 7 can be easily and efficiently performed as in the above-described embodiments.

(Fifth embodiment)
FIG. 10 is an explanatory diagram of the paving plate cutting and removing step of the paving plate 1 according to the fifth embodiment. In this embodiment, the removal of the paving plate piece 7 is performed using the suction machine 13. The suction machine 13 is mainly composed of a suction body 13a having a suction port 13b and a hose 13c attached to the suction body 13a. The object is sucked to the suction port 13b by the suction force through the hose 13c.

The operator first lowers the plurality of suction machines 13 and arranges the suction ports 13b on the pavement plate piece 7. Next, the operator lifts the wire 13 d attached to the suction machine 13 while sucking the paving plate piece 7 with the suction machine 13. As the suction machine 13 rises, the pavement plate piece 7 also rises, whereby the pavement plate piece 7 is removed from the pavement plate 1.

  According to this embodiment, the removal work of the paving plate piece 7 can be easily and efficiently performed as in the above-described embodiments.

(Sixth embodiment)
FIG. 11 is an explanatory diagram of the paving plate cutting and removing process of the paving plate 1 according to the sixth embodiment. In this embodiment, the pavement plate piece 7 is removed by adhering the fixture 14a to the surface of the pavement plate piece 7. The attachment 14a is formed with an attachment portion for the wire 14b and a smooth adhesive surface.

  The operator first bonds the plurality of fixtures 14a to the surface of the paving plate piece 7 using a strong quick-drying adhesive. Then, the worker raises the wire 14b attached to the fixture 14a. Thereby, the pavement plate piece 7 is removed from the pavement plate 1.

  According to this embodiment, the removal work of the paving plate piece 7 can be easily and efficiently performed as in the above-described embodiments.

[Vertical drilling (Step 2)]
The excavation of the vertical hole (step 2) is a suction excavation process in which suction excavation work (step a4) and confirmation of the buried position and depth (step a5) are performed. In this suction excavation process, the casing is placed in a predetermined area from which the paving plate pieces have been removed, and the ground exposed to the inner bottom of the casing is checked before the casing is lowered to the ground while confirming the presence or absence of an embedded object. A vertical hole is made by suction drilling.

  In the excavation of the vertical hole, the vertical hole is excavated by using the lowering of the casing and the suction excavation directly below the area where the pavement plate piece 7 is removed. The operator lowers the casing having a role as a retaining ring to the upper-layer roadbed 2, the lower-layer roadbed 3, and the roadbed 4 by its own weight or hydraulic pressure while excavating the earth and sand generated by excavation. By performing suction excavation prior to the descent of the casing, it is possible to visually confirm the presence or absence of an unexpected buried object 5 'existing on the road bed 4, and therefore it is possible to avoid damage or destruction beforehand. The earth and sand generated by excavation is stored and stored in a predetermined processing bag in consideration of the environment.

  FIG. 12 is an explanatory diagram of the vertical hole suction excavation process in the road bed 4. As an initial state of this work, as shown in FIG. 12 (a), the vertical hole 11 passes through the pavement plate 1 and reaches the uppermost part of the upper layer roadbed 2. An exposed surface 2a of the road bed 2 that is the ground appears on the inner bottom of the casing 10 surrounding the periphery of the vertical hole 11. First, the operator places a cylindrical casing 10 (φ = 900 mm) as shown in FIG. 14 in the work area S (back surface of the ground) from which the pavement plate piece 7 has been removed.

  Next, as shown in FIG. 12 (b), the operator sucks and excavates the ground exposed on the inner bottom of the casing 10 prior to lowering the casing 10 to the ground. The earth and sand generated by excavation is sucked through the hose 120. The hose 120 is connected to a powerful pump machine that sucks earth and sand together with air. An operator advances excavation by sucking earth and sand while operating the hose 120 connected to the pump machine. As an odor-like technique for excavation, for example, erosion of sediment on the exposed surface with high-pressure air (air pressure) or jet (water pressure), and the resulting sediment (including water in the case of a jet) is performed with a pump machine. In this case, since the pump machine absorbs dust generated during excavation work, the influence of dust around the work castle can be suppressed as much as possible. If soft, if possible, the ground may be excavated by suction alone.

At the time of this excavation, the portion immediately below the peripheral portion of the casing 10 is also excavated. Therefore, Figure 12 (c)
As shown, the casing 10 is lowered by its own weight. However, instead of this, the casing 10 may be press-fitted using an oil pressure that lowers the casing 10. In this case, press fitting may be performed while rotating the casing 10 with a hydraulic machine. This is effective when it is difficult to descend by its own weight due to the frictional force generated between the outer peripheral wall of the casing 10 and the ground.

  The excavation in the suction excavation process includes excavation of the upper layer subbase 2 and the lower layer subbase 3 and excavation of the subgrade 4 corresponding thereto. Both are the same in that the excavation by suction of the casing 10 is used together, but in the latter case, it is necessary to excavate while confirming the unexpected buried object 5 ', so a process different from the former is adopted. Has been.

  First, the upper and lower roadbeds 2 and 3 are excavated by the same process as before until the roadbed 4 is exposed on the inner bottom of the casing 10. These roadbeds 2 and 3 are artificially stacked when laying a road, and it is obvious that there are no buried objects. Therefore, for excavation of roadbeds 2 and 3, there is no need to adopt an excavation process that involves confirmation of unexpected buried objects as described below.

  On the other hand, with respect to the roadbed 4, a vertical hole is excavated by a trial excavation process with confirmation of an embedded object. There is a possibility that unexpectedly buried objects (such as gas pipes) that are not grasped by the operator may be buried in the roadbed 4 other than the work objects 5 (such as water pipes) that are grasped by the worker. is there. As shown in FIG. 1, when the unexpected buried object 5 ′ is present at a location shallower than the work object 5, when the casing 10 is lowered without performing the test excavation, the unexpected buried object 5 ′ is removed by the casing 10. There is a risk of damage or destruction. In order to prevent such a situation in advance, a process of lowering the casing 10 while confirming that there is no unexpected buried object 5 ′ in the trial moat as in this embodiment is adopted. Is preferred.

  FIG. 13 is a flowchart showing a flow of a vertical hole suction excavation process in the road bed 4. First, by repeating the loop of steps 21 to 23, a part of the exposed surface 2a is excavated by air (or jet or the like) by a predetermined depth Djet (FIG. 12 (c)). Specifically, the operator excavates the exposed surface 2a using the suction force from the hose 120. The sucked earth and sand are discharged and stored in a predetermined processing bag prepared separately from the paving plate disposal as required. The partial excavation of the exposed surface 2a also has a trial-drilling meaning for confirming that there is no unexpected buried object 5 ′ within the predetermined depth Djet. Therefore, for example, the inner periphery of the vertical hole 11 may be excavated, or any one or a plurality of locations may be excavated. From the viewpoint of the trial moat, it is not always necessary to excavate the entire exposed surface 2a, but it is naturally possible to excavate the entire exposed surface 2a.

  When the partial excavation for the predetermined depth Djet is completed without the appearance of an embedded object, the process proceeds from step 23 to step 24, and the casing 10 is lowered according to the predetermined depth Djet. That is, the casing 10 is lowered by the depth following the suction excavation shown on the left on the condition that the buried object does not exist within a predetermined depth. In the subsequent step 25, the remaining area of the exposed surface 2a that has not been excavated is excavated by air (or jet or the like) for a predetermined depth Djet. As a result, the entire exposed surface 2a is dug down by a predetermined depth Djet. When this digging is completed, the loop of steps 21 to 23 is repeated again, and the partial excavation of the exposed surface 2a is performed for the next predetermined depth Djet.

  Here, when an embedded object appears by suction excavation, the process proceeds from step 22 to step 26, and it is determined whether or not the current depth of the vertical hole 11 has reached the target depth Dtgt. If the buried object appears before reaching the target depth Dtgt, this is an unexpected buried object 5 ′ (step 28), and therefore it is necessary to take appropriate measures including interruption of the work.

  On the other hand, when the unexpected buried object 5 ′ does not appear by the suction excavation, the excavation of the exposed surface 2a (steps 21 to 23), the lowering of the casing 10 (step 24), and the exposed surface 2a The remaining excavation (step 25) is repeated. Thereby, the dug-down of the vertical hole 11 is advanced step by step in units of a predetermined depth Djet. Then, when the depth of the vertical hole 11 reaches the target depth Dtgt, the buried work object 5 appears (FIG. 7 (d)). In this case, the excavation of the vertical hole 11 is completed through the affirmative determination in step 22, the affirmative determination in step 26, and step 27.

[Processing and construction of work objects (Step 3)]
In the processing and construction of the work object (Step 3), it is judged whether the pipeline is newly established or the existing pipeline is updated (Step a6). If the pipeline is newly established, the new pipeline is laid (Step a7) and the existing pipeline is updated. This is a non-open laying process in which the existing pipeline is updated (step a8).

  In the processing execution of the work object (step 3), a predetermined process is applied to the work object 5 that appears at the bottom of the vertical hole formed by excavation. For example, an old lead-in pipe (for example, lead pipe) that draws water into residential land or premises is replaced with a new lead-in pipe (for example, polyethylene pipe, hard polyvinyl chloride pipe, stainless steel pipe, etc.) by non-cutting method (update of lead-in pipe) . As the non-cutting method, for example, reasoning is performed by ekstep. For example, an old lead-in pipe (for example, lead pipe) that draws water into residential land or premises is replaced with a new lead-in pipe (for example, polyethylene pipe, hard polyvinyl chloride pipe, stainless steel pipe, etc.) by non-cutting method (update of lead-in pipe) . Non-open cutting methods, for example, extractor system (`` extractor system '' is a registered trademark of TS Sade), banana method (`` banana method '' is a registered trademark of Hanex Road), bamboo shoot molding method, or Dream promotion construction method etc. are mentioned. In addition, this invention is applicable not only to the renewal of the lead-in pipe, but also to the new construction of the lead-in pipe using the propulsion method, for example.

  In this non-cutting laying process, when the ground is suction excavated to the target depth, the lead-in pipe is updated or newly installed using the non-cutting method. Laying of buried pipes in the MDP method will be carried out by the non-open cutting method. In the case of a new pipeline, construction will be carried out by the propulsion method, and in the case of replacing an existing pipeline with a new one, construction will be carried out by the drawing method.

  The MDP construction method is characterized by the laying of buried pipes, which are buried, without excavation, which can greatly reduce the excavation area and soil volume, and depending on the width of the road, construction can be performed with only one lane occupied. It becomes possible.

  The non-open-cut method differs depending on whether a pipeline is newly established or an existing pipeline is replaced with a new one. In the case of a new pipeline, the propulsion method is used, and in the case of a new pipeline, the propulsion method is laid. On the other hand, when the existing pipeline is renewed, the buried pipe is constructed by the drawing method.

  FIG. 15 is a diagram for explaining a propulsion method for establishing a new pipeline. To establish a new pipeline, install a propulsion unit 50 in a vertical shaft constructed by suction excavation (Fig. 15 (a)), and start from the propulsion unit 50 while adding a buried pipe of a predetermined length (Fig. 15 (b)) We carry out by propulsion method to advance to residential land. At the time of construction, the propulsion position and propulsion direction of the buried pipe are confirmed by the detector 51, and in the residential land, the correction bending propulsion is performed by the swing propulsion and the construction is performed to connect to the meter box 52 (FIG. 15C).

  FIG. 16 is a diagram for explaining a drawing method for updating an existing pipeline. The existing pipeline is updated by a drawing method. In this drawing method, first, the tip of the buried pipe (lead pipe) to be drawn (the farthest from the shaft position, usually in the residential land) is cut, for example, near the meter box 52 ( In FIG. 16 (a)), the renewal pipe 53 (usually polyethylene pipe) is connected with a dedicated connection fitting or the like (FIG. 16 (a)). Thereafter, a wire 55 having a conical cone 54 is passed through the buried pipe 60 (FIG. 16 (b)), and the wire 55 is pulled by a pulling winch 56 (FIG. 16 (c)). Pulling out and laying pipes for renewal are performed simultaneously (FIG. 16 (d)). In this non-open cutting method, only the minimum area necessary for laying buried pipes is excavated, so the construction is performed in a narrow place.

[Backfill vertical holes (Step 4)]
The vertical hole backfilling (step 4) is a backfilling process for performing a backfilling process (step a9). FIG. 17 is a diagram for explaining a vertical hole backfilling process in the case of using improved soil. In the vertical hole backfilling step, the vertical hole is backfilled while pulling up the casing surrounding the vertical hole (FIG. 17A). Here, the vertical hole is backfilled (FIG. 17 (c)) by converting the earth and sand generated during the excavation of the vertical hole into an improved soil and reusing it (FIG. 17 (b)).

  In the backfilling work, after the construction, the backfilling soil is sufficiently compacted so that the road does not sink due to driving or the like so that a predetermined compaction density can be secured. The backfilling soil is preferably a high-quality soil such as sand that is easy to compact. From the viewpoint of reducing residual soil treatment and contributing to environmental problems, improved soil with improved materials such as lime added to the locally generated soil is effective, but it may not be improved soil and limited to locally generated soil It may be purchased soil.

  When using locally generated soil as improved soil, a blending test is conducted in advance as necessary to determine the type and amount of the improved material. Such reuse is not only environmentally friendly because it eliminates the need to dispose of earth and sand, but also is excellent in terms of cost because it also eliminates the need to transport earth and sand.

In the backfilling operation, for example, the backfilling soil is spread out at a layer thickness of about 20 to 30 cm, and sufficiently compacted with a compacting machine to ensure a predetermined compaction density. In particular, the boundary part with the surrounding natural ground is constructed while pulling out the casing for preventing the collapse of the hole wall, so it is carefully compacted with ramps, etc., and after construction, there is a step between the backfill part and the surrounding natural ground. Do not.
[Restoration of paving plate (Step 5)]
In the repair of the pavement (step 5), it is determined whether temporary restoration is necessary (step a10). If temporary restoration is not necessary, this restoration work (step a11), and if temporary restoration is necessary, temporary restoration work (step a12). ) This is the process of performing the restoration work later.

  In the restoration of the pavement plate, after pulling out the casing, the lower layer roadbed 3, the upper layer roadbed 2 and the pavement plate 1 are sequentially restored by the same method as before. In the case of performing temporary restoration of the pavement plate 1 as an emergency measure, the pavement plate piece 7 (which may be an iron lining plate) stored in step 1 may be fitted back into a predetermined area. . The restoration work on the pavement surface (roadbed) ensures predetermined pavement performance and eliminates steps so as not to interfere with traffic such as driving of automobiles, bicycles, and pedestrian traffic to ensure predetermined flatness.

  Moreover, if the cut pavement plate is stored, it can be used for temporary restoration. In this case, only the portion cut by the cutter is filled with mortar or grout material. In addition, if this restoration work cannot be performed immediately due to the weather, etc., iron plate curing will be carried out for a period until it can be constructed.

  In the case of this restoration work, as with the temporary restoration work, a roadbed that satisfies a predetermined quality is constructed so as to ensure traffic safety and prevent subsidence due to automobile travel after construction.

  According to the MDP method having the processes from Step 1 to Step 5 as described above, workability, environmental performance (“friendly to the global environment”), and safety can be totally satisfied.

  In particular, according to the removal process (step 1) of the pavement plate 1, partial removal of the pavement plate 1 can be accurately performed with a simple operation. That is, the paving plate piece 7 is removed by raising the clamp 9 holding the paving plate piece 7. Since the side surface of the pavement plate piece 7 is provided with a taper having a diameter reduced in the depth direction, dropping of the nipped pavement plate piece 7 is effectively regulated. Further, a special and complicated lifting tool for removing the paving plate piece 7 is not necessarily required, and the work can be efficiently performed using a general-purpose device having a simple configuration such as the clamp 9. In addition, the pavement plate piece 7 can be removed as one piece without being destroyed, and generation of dust and noise due to the destruction can be prevented. Furthermore, when disposing the pavement plate piece 7 as an asphalt lump together, it can be transported compactly on the road by storing it in a dedicated storage bag, which is advantageous in terms of road disposal.

  In particular, in the excavation process of the vertical hole 11 (step 2), the ground exposed at the inner bottom of the casing 10 is excavated by suction prior to the lowering of the casing 10 which plays a role of securing the earth retaining. Then, when the buried object does not appear by the suction excavation, the casing 10 is lowered to the ground following the suction excavation. Since the descending of the casing 10 is performed on the condition that the buried object does not appear, even if the unexpected buried object 5 ′ is buried in the ground, it is necessary to avoid the damage or destruction of the buried object in advance. Can do. In addition, earth and sand generated by excavation are guarded by the casing 10 so as not to be scattered outside (especially when the excavation depth is shallow) and are immediately sucked through the hose 120. Therefore, since the work site is not soiled with earth and sand, the environment is excellent. Furthermore, the suction excavation can realize low dust and low noise, so that the influence on the vicinity of the work site can be reduced. In addition, when reclaiming earth and sand (improved earth and sand etc.) stored in a predetermined processing bag for backfilling the vertical hole 11, it is excellent not only in terms of environment but also in terms of cost (transportation cost) Is no longer needed).

  In this embodiment, when the clamp 9 is raised, the tips of the plurality of clamp arms 9b are engaged with the tapered side surfaces of the pavement plate piece 7 due to its own weight. However, the present invention is not limited to this. For example, it is necessary to actively control the operation of the clamp arm 9b so that the plurality of clamp arms 9b are displaced in the closing direction by hydraulic pressure. Engaging force may be secured.

Furthermore, in this embodiment, the work area S is circular, but the present invention is not limited to this, and may be any shape including a rectangular piece or the like.
(Embodiment of the second invention)
FIG. 18 is an explanatory view of the buried object laying method of the second invention.

  Unlike the buried object laying method of the first invention, the buried object laying method of the second invention is carried out on the ground where the paving slab 1 (road) such as asphalt is not laid on the ground. A work object 5 that is a buried object to be worked is buried in the road bed 4 at a known target depth Dtgt. In this embodiment, a series of operations are performed in the order of vertical hole excavation (step 2), work object processing (step 3), and vertical hole backfilling (step 4).

  The construction procedure of the buried object laying method according to the second invention is shown in FIG. 19 and carried out in the same manner as FIG. 2, but the preparation work (step a1), suction excavation work (step a4), and confirmation of the buried position and depth (Step a5), determine whether a pipeline is newly established or an existing pipeline is updated (Step a6), if a pipeline is newly established, laying a new pipeline (Step a7), if updating an existing pipeline, update the existing pipeline (Step a8), backfilling (step a9), judging whether temporary restoration is necessary (step a10), if temporary restoration is not necessary, this restoration (step a11), if temporary restoration is necessary, temporary restoration (step a12) After this restoration work. By performing the minimum excavation even in a place where there is no pavement plate, workability, safety and environmental performance can be satisfied as a whole.

  The present invention can be applied to a buried construction method for renewing or newly installing buried objects such as lead-in pipes, and by performing minimal excavation regarding renewal and new construction of buried objects such as lead-in pipes, workability and safety are improved. This is a new method for laying buried objects that satisfies the overall environment. In

It is explanatory drawing of the buried pipe laying construction method of 1st invention. It is a figure which shows the construction procedure of the buried pipe laying construction method which performs the update or new installation of a buried thing. FIG. 5 is an explanatory diagram of a cutting process for a pavement plate according to the first embodiment. It is a block diagram of the circular cutter as an example. FIG. 3 is a cross-sectional view of a cutting process for a pavement plate according to the first embodiment. FIG. 5 is an explanatory diagram of a pavement plate removing process according to the first embodiment. FIG. 6 is an explanatory diagram of a pavement plate removing process according to a second embodiment. FIG. 10 is an explanatory diagram of a pavement plate removing process according to a third embodiment. It is explanatory drawing of the removal process of the pavement plate which concerns on 4th Embodiment. FIG. 10 is an explanatory diagram of a pavement plate removing process according to a fifth embodiment. It is explanatory drawing of the removal process of the pavement plate which concerns on 6th Embodiment. It is explanatory drawing of the excavation process of the vertical hole in a road bed. It is a flowchart which shows the flow of the excavation process of the vertical hole in a roadbed. It is an external appearance perspective view of a casing. It is explanatory drawing of a propulsion construction method. It is explanatory drawing of the drawing method. It is explanatory drawing of a backfilling process. FIG. 6 is an explanatory diagram of a buried pipe laying method according to a second invention. It is a figure which shows the construction procedure of the buried pipe laying construction method which performs the update or new installation of a buried thing.

Explanation of symbols

1 paving version
2 Upper class roadbed
2a Exposed surface
3 Lower layer roadbed
4 subgrade
5 Work object
5 'Unexpected buried object
6 cutting groove
7 paving plate
8 circular cutter
8a cutter blade
9 clamps
9a fulcrum
9b clamp arm
10 casing
11 vertical holes
120 hose
11a, 12a base
11b, 12b clamp arm
11c, 12c fulcrum
11d, 12d wire
13 suction machine
13a suction body
13b suction port
13c hose
13d wire
14a fitting
14b wire

Claims (20)

It is a method for laying buried objects that will be renewed or newly constructed.
In order to form a paving plate piece separated from the surroundings, from the surface of the paving plate laid on the ground to the roadbed under the paving plate, the outer periphery of a predetermined area set in the paving plate is cut, A paving plate cutting and removing step of removing the cut paving plate piece from the paving plate;
Prior to lowering the casing to the ground, the casing exposed to the inner bottom of the casing is sucked and excavated while checking the presence or absence of the buried object before placing the casing on the ground. Suction excavation process to construct vertical holes,
When the ground is suction excavated to the target depth, a non-open cut laying step of updating or newly installing a buried object using a non-open cut construction method,
A backfilling step of backfilling the vertical holes while pulling up the casing;
A method for laying buried objects, characterized by comprising: It is a method for laying buried objects that will be renewed or newly constructed.
A suction excavation step in which a casing is arranged in a predetermined area, and before the descent of the casing to the ground, the ground exposed at the inner bottom of the casing is suction excavated and a vertical hole is constructed while confirming the presence or absence of an embedded object. When,
When the ground is suction excavated to the target depth, a non-open cut laying step of updating or newly installing a buried object using a non-open cut construction method,
A backfilling step of backfilling the vertical holes while pulling up the casing;
A retractable pipe laying method characterized by comprising:   3. The lead-in pipe laying method according to claim 1 or 2, further comprising a restoration step of ensuring a predetermined flatness by eliminating a step from the periphery after the backfilling. In the paving plate cutting and removing step,
In order to form a paving plate piece that has a tapered side surface with a reduced cross-sectional area in the depth direction and is separated from the surroundings, the surface of the paving plate laid on the ground is below the paving plate. A cutting step of cutting the outer periphery of the predetermined area set in the paving plate with a cutter until reaching the roadbed,
A holding step of lowering a clamp having a plurality of clamp arms attached to the fulcrum so as to be opened and closed, and fitting the plurality of clamp arms into a cutting groove formed by the cutter from above;
Removing the paving plate piece from the paving plate by raising the clamp while maintaining the state where the plurality of clamp arms sandwich the tapered side surface of the paving plate piece;
2. The buried article laying method according to claim 1, characterized by comprising: In the removing step,
When the clamps are raised, due to the displacement of the clamp arms in the closing direction caused by the weight of the paving plate pieces, the tips of the clamp arms are brought to the tapered side surfaces of the paving plate pieces. 5. The buried object laying method according to claim 4, wherein the method is engaged. In the removing step,
5. The embedded object laying according to claim 4, wherein tips of the plurality of clamps are engaged with tapered side surfaces of the paving plate piece by displacing the plurality of clamp arms in a closing direction by hydraulic pressure. Construction method. In the paving plate cutting and removing step,
In order to form a paving plate piece separated from the surroundings, the outer periphery of a predetermined area set in the paving plate is cut with a cutter from the surface of the paving plate laid on the ground to the roadbed under the paving plate. Cutting step to
A holding step of inserting a rod-shaped lifting tool into the cut paving plate piece from above at a first insertion angle;
By displacing the lifting tool inserted through the paving plate piece to a second insertion angle different from the first insertion angle, the lifting tool is pressed against the paving plate piece and the second insertion is performed. Removing the paving plate piece from the paving plate by raising the lifting tool while maintaining the angle;
2. The buried article laying method according to claim 1, characterized by comprising: In the paving plate cutting and removing step,
In order to form a paving plate piece separated from the surroundings, the outer periphery of a predetermined area set in the paving plate is cut with a cutter from the surface of the paving plate laid on the ground to the roadbed directly below the paving plate. Cutting step to
A clamp having a plurality of clamp arms whose tips can be bent is lowered, and the plurality of clamp arms are fitted into a cutting groove formed by the cutter from above with the tips of the plurality of clamp arms extended. Steps,
By changing the distal ends of the plurality of clamp arms from an extended state to a bent state, the front ends of the plurality of clamp arms are engaged with the side surfaces of the paving plate piece, and then the clamps are raised. Removing the paving plate piece from the paving plate;
2. The buried article laying method according to claim 1, characterized by comprising: In the paving plate cutting and removing step,
In order to form a paving plate piece separated from the surroundings, the outer periphery of a predetermined area set in the paving plate is cut with a cutter from the surface of the paving plate laid on the ground to the roadbed under the paving plate. Cutting step to
A holding step of fitting the plurality of clamp arms from above into a cutting groove formed by the cutter by lowering a clamp having a plurality of clamp arms attached to the fulcrum so as to be openable and closable at a first insertion angle. When,
By displacing the plurality of clamp arms fitted in the cutting grooves to a second insertion angle different from the first insertion angle, the tips of the plurality of clamp arms are brought into pressure contact with the side surface of the pavement plate piece. And removing the paving plate piece from the paving plate by raising the clamp while maintaining the second insertion angle,
2. The buried article laying method according to claim 1, characterized by comprising: In the paving plate cutting and removing step,
In order to form a paving plate piece separated from the surroundings, the outer periphery of a predetermined area set in the paving plate is cut with a cutter from the surface of the paving plate laid on the ground to the roadbed under the paving plate. Cutting step to
A holding step of arranging a suction port of a suction machine on the surface of the paving plate piece;
Removing the paving plate piece from the paving plate by raising the suction machine while sucking the paving plate piece by the suction device;
2. The buried article laying method according to claim 1, characterized by comprising: In the paving plate cutting and removing step,
In order to form a paving plate piece separated from the surroundings, the outer periphery of a predetermined area set in the paving plate is cut with a cutter from the surface of the paving plate laid on the ground to the roadbed under the paving plate. Cutting step to
A holding step of bonding a fixture to the surface of the paving plate piece;
Removing the pavement plate piece from the pavement plate by raising the wire attached to the fixture; and
2. The buried article laying method according to claim 1, characterized by comprising:   12. The cutting method according to claim 4, wherein the cutting step includes a step of sucking a sewage generated by the cutting with a pump simultaneously with performing a cutting using a wet cutter as the cutter. The method for laying buried objects as described in the paragraph. In the suction excavation process,
An arrangement step of arranging the casing in a predetermined area on the surface of the ground;
Prior to lowering the casing to the ground, confirming the presence of buried objects,
A suction excavation step for suction excavation of the ground exposed on the inner bottom of the casing;
When a buried object does not appear by the suction excavation, a descent step of lowering the casing to the ground following the suction excavation,
4. The method for laying an embedded object according to claim 1, wherein:   14. The buried object laying method according to claim 13, wherein a series of steps from the suction excavation step to the descent step is repeated until a target depth in the ground is reached. The descent step comprises:
15. The buried article laying method according to claim 13 or 14, wherein when the excavation is performed directly under a peripheral portion of the casing by suction excavation, the casing is lowered by its own weight. The descent step comprises:
15. The buried article laying method according to claim 13 or 14, wherein the casing is press-fitted into the ground using an oil pressure for lowering the casing. In the non-open laying process,
4. The buried construction method according to any one of claims 1 to 3, wherein construction is performed by a pulling method in the case of renewing a buried object, and construction is performed by a propulsion method in the case of newly installing a buried object. In the backfilling step,
4. The buried object laying method according to any one of claims 1 to 3, wherein the vertical hole is backfilled by compacting with improved soil obtained by adding an improved material to excavated soil. In the backfilling step,
A storage step of storing the paving plate piece removed from the paving plate;
After completion of a predetermined operation for the predetermined area, a refit step of fitting the stored pavement plate piece back into the predetermined area;
19. The buried article laying method according to claim 18, further comprising: The predetermined area is:
20. A circular shape having a diameter of about 900 mm.
The embedded construction method according to any one of the above.